diff options
Diffstat (limited to 'binutils-2.17/gas/config/tc-mmix.c')
| -rw-r--r-- | binutils-2.17/gas/config/tc-mmix.c | 4244 |
1 files changed, 0 insertions, 4244 deletions
diff --git a/binutils-2.17/gas/config/tc-mmix.c b/binutils-2.17/gas/config/tc-mmix.c deleted file mode 100644 index c1a8d536..00000000 --- a/binutils-2.17/gas/config/tc-mmix.c +++ /dev/null @@ -1,4244 +0,0 @@ -/* tc-mmix.c -- Assembler for Don Knuth's MMIX. - Copyright (C) 2001, 2002, 2003, 2004, 2005 Free Software Foundation. - - This file is part of GAS, the GNU Assembler. - - GAS is free software; you can redistribute it and/or modify - it under the terms of the GNU General Public License as published by - the Free Software Foundation; either version 2, or (at your option) - any later version. - - GAS is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - GNU General Public License for more details. - - You should have received a copy of the GNU General Public License - along with GAS; see the file COPYING. If not, write to - the Free Software Foundation, 51 Franklin Street - Fifth Floor, - Boston, MA 02110-1301, USA. */ - -/* Knuth's assembler mmixal does not provide a relocatable format; mmo is - to be considered a final link-format. In the final link, we make mmo, - but for relocatable files, we use ELF. - - One goal is to provide a superset of what mmixal does, including - compatible syntax, but the main purpose is to serve GCC. */ - - -#include <stdio.h> -#include <limits.h> -#include "as.h" -#include "subsegs.h" -#include "bfd.h" -#include "elf/mmix.h" -#include "opcode/mmix.h" -#include "safe-ctype.h" -#include "dwarf2dbg.h" -#include "obstack.h" - -/* Something to describe what we need to do with a fixup before output, - for example assert something of what it became or make a relocation. */ - -enum mmix_fixup_action - { - mmix_fixup_byte, - mmix_fixup_register, - mmix_fixup_register_or_adjust_for_byte - }; - -static int get_spec_regno (char *); -static int get_operands (int, char *, expressionS *); -static int get_putget_operands (struct mmix_opcode *, char *, expressionS *); -static void s_prefix (int); -static void s_greg (int); -static void s_loc (int); -static void s_bspec (int); -static void s_espec (int); -static void mmix_s_local (int); -static void mmix_greg_internal (char *); -static void mmix_set_geta_branch_offset (char *, offsetT); -static void mmix_set_jmp_offset (char *, offsetT); -static void mmix_fill_nops (char *, int); -static int cmp_greg_symbol_fixes (const void *, const void *); -static int cmp_greg_val_greg_symbol_fixes (const void *, const void *); -static void mmix_handle_rest_of_empty_line (void); -static void mmix_discard_rest_of_line (void); -static void mmix_byte (void); -static void mmix_cons (int); - -/* Continue the tradition of symbols.c; use control characters to enforce - magic. These are used when replacing e.g. 8F and 8B so we can handle - such labels correctly with the common parser hooks. */ -#define MAGIC_FB_BACKWARD_CHAR '\003' -#define MAGIC_FB_FORWARD_CHAR '\004' - -/* Copy the location of a frag to a fix. */ -#define COPY_FR_WHERE_TO_FX(FRAG, FIX) \ - do \ - { \ - (FIX)->fx_file = (FRAG)->fr_file; \ - (FIX)->fx_line = (FRAG)->fr_line; \ - } \ - while (0) - -const char *md_shortopts = "x"; -static int current_fb_label = -1; -static char *pending_label = NULL; - -static bfd_vma lowest_text_loc = (bfd_vma) -1; -static int text_has_contents = 0; - -/* The alignment of the previous instruction, and a boolean for whether we - want to avoid aligning the next WYDE, TETRA, OCTA or insn. */ -static int last_alignment = 0; -static int want_unaligned = 0; - -static bfd_vma lowest_data_loc = (bfd_vma) -1; -static int data_has_contents = 0; - -/* The fragS of the instruction being assembled. Only valid from within - md_assemble. */ -fragS *mmix_opcode_frag = NULL; - -/* Raw GREGs as appearing in input. These may be fewer than the number - after relaxing. */ -static int n_of_raw_gregs = 0; -static struct - { - char *label; - expressionS exp; - } mmix_raw_gregs[MAX_GREGS]; - -/* Fixups for all unique GREG registers. We store the fixups here in - md_convert_frag, then we use the array to convert - BFD_RELOC_MMIX_BASE_PLUS_OFFSET fixups in tc_gen_reloc. The index is - just a running number and is not supposed to be correlated to a - register number. */ -static fixS *mmix_gregs[MAX_GREGS]; -static int n_of_cooked_gregs = 0; - -/* Pointing to the register section we use for output. */ -static asection *real_reg_section; - -/* For each symbol; unknown or section symbol, we keep a list of GREG - definitions sorted on increasing offset. It seems no use keeping count - to allocate less room than the maximum number of gregs when we've found - one for a section or symbol. */ -struct mmix_symbol_gregs - { - int n_gregs; - struct mmix_symbol_greg_fixes - { - fixS *fix; - - /* A signed type, since we may have GREGs pointing slightly before the - contents of a section. */ - offsetT offs; - } greg_fixes[MAX_GREGS]; - }; - -/* Should read insert a colon on something that starts in column 0 on - this line? */ -static int label_without_colon_this_line = 1; - -/* Should we automatically expand instructions into multiple insns in - order to generate working code? */ -static int expand_op = 1; - -/* Should we warn when expanding operands? FIXME: test-cases for when -x - is absent. */ -static int warn_on_expansion = 1; - -/* Should we merge non-zero GREG register definitions? */ -static int merge_gregs = 1; - -/* Should we pass on undefined BFD_RELOC_MMIX_BASE_PLUS_OFFSET relocs - (missing suitable GREG definitions) to the linker? */ -static int allocate_undefined_gregs_in_linker = 0; - -/* Should we emit built-in symbols? */ -static int predefined_syms = 1; - -/* Should we allow anything but the listed special register name - (e.g. equated symbols)? */ -static int equated_spec_regs = 1; - -/* Do we require standard GNU syntax? */ -int mmix_gnu_syntax = 0; - -/* Do we globalize all symbols? */ -int mmix_globalize_symbols = 0; - -/* When expanding insns, do we want to expand PUSHJ as a call to a stub - (or else as a series of insns)? */ -int pushj_stubs = 1; - -/* Do we know that the next semicolon is at the end of the operands field - (in mmixal mode; constant 1 in GNU mode)? */ -int mmix_next_semicolon_is_eoln = 1; - -/* Do we have a BSPEC in progress? */ -static int doing_bspec = 0; -static char *bspec_file; -static unsigned int bspec_line; - -struct option md_longopts[] = - { -#define OPTION_RELAX (OPTION_MD_BASE) -#define OPTION_NOEXPAND (OPTION_RELAX + 1) -#define OPTION_NOMERGEGREG (OPTION_NOEXPAND + 1) -#define OPTION_NOSYMS (OPTION_NOMERGEGREG + 1) -#define OPTION_GNU_SYNTAX (OPTION_NOSYMS + 1) -#define OPTION_GLOBALIZE_SYMBOLS (OPTION_GNU_SYNTAX + 1) -#define OPTION_FIXED_SPEC_REGS (OPTION_GLOBALIZE_SYMBOLS + 1) -#define OPTION_LINKER_ALLOCATED_GREGS (OPTION_FIXED_SPEC_REGS + 1) -#define OPTION_NOPUSHJSTUBS (OPTION_LINKER_ALLOCATED_GREGS + 1) - {"linkrelax", no_argument, NULL, OPTION_RELAX}, - {"no-expand", no_argument, NULL, OPTION_NOEXPAND}, - {"no-merge-gregs", no_argument, NULL, OPTION_NOMERGEGREG}, - {"no-predefined-syms", no_argument, NULL, OPTION_NOSYMS}, - {"gnu-syntax", no_argument, NULL, OPTION_GNU_SYNTAX}, - {"globalize-symbols", no_argument, NULL, OPTION_GLOBALIZE_SYMBOLS}, - {"fixed-special-register-names", no_argument, NULL, - OPTION_FIXED_SPEC_REGS}, - {"linker-allocated-gregs", no_argument, NULL, - OPTION_LINKER_ALLOCATED_GREGS}, - {"no-pushj-stubs", no_argument, NULL, OPTION_NOPUSHJSTUBS}, - {"no-stubs", no_argument, NULL, OPTION_NOPUSHJSTUBS}, - {NULL, no_argument, NULL, 0} - }; - -size_t md_longopts_size = sizeof (md_longopts); - -static struct hash_control *mmix_opcode_hash; - -/* We use these when implementing the PREFIX pseudo. */ -char *mmix_current_prefix; -struct obstack mmix_sym_obstack; - - -/* For MMIX, we encode the relax_substateT:s (in e.g. fr_substate) as one - bit length, and the relax-type shifted on top of that. There seems to - be no point in making the relaxation more fine-grained; the linker does - that better and we might interfere by changing non-optimal relaxations - into other insns that cannot be relaxed as easily. - - Groups for MMIX relaxing: - - 1. GETA - extra length: zero or three insns. - - 2. Bcc - extra length: zero or five insns. - - 3. PUSHJ - extra length: zero or four insns. - Special handling to deal with transition to PUSHJSTUB. - - 4. JMP - extra length: zero or four insns. - - 5. GREG - special handling, allocates a named global register unless another - is within reach for all uses. - - 6. PUSHJSTUB - special handling (mostly) for external references; assumes the - linker will generate a stub if target is no longer than 256k from - the end of the section plus max size of previous stubs. Zero or - four insns. */ - -#define STATE_GETA (1) -#define STATE_BCC (2) -#define STATE_PUSHJ (3) -#define STATE_JMP (4) -#define STATE_GREG (5) -#define STATE_PUSHJSTUB (6) - -/* No fine-grainedness here. */ -#define STATE_LENGTH_MASK (1) - -#define STATE_ZERO (0) -#define STATE_MAX (1) - -/* More descriptive name for convenience. */ -/* FIXME: We should start on something different, not MAX. */ -#define STATE_UNDF STATE_MAX - -/* FIXME: For GREG, we must have other definitions; UNDF == MAX isn't - appropriate; we need it the other way round. This value together with - fragP->tc_frag_data shows what state the frag is in: tc_frag_data - non-NULL means 0, NULL means 8 bytes. */ -#define STATE_GREG_UNDF ENCODE_RELAX (STATE_GREG, STATE_ZERO) -#define STATE_GREG_DEF ENCODE_RELAX (STATE_GREG, STATE_MAX) - -/* These displacements are relative to the address following the opcode - word of the instruction. The catch-all states have zero for "reach" - and "next" entries. */ - -#define GETA_0F (65536 * 4 - 8) -#define GETA_0B (-65536 * 4 - 4) - -#define GETA_MAX_LEN 4 * 4 -#define GETA_3F 0 -#define GETA_3B 0 - -#define BCC_0F GETA_0F -#define BCC_0B GETA_0B - -#define BCC_MAX_LEN 6 * 4 -#define BCC_5F GETA_3F -#define BCC_5B GETA_3B - -#define PUSHJ_0F GETA_0F -#define PUSHJ_0B GETA_0B - -#define PUSHJ_MAX_LEN 5 * 4 -#define PUSHJ_4F GETA_3F -#define PUSHJ_4B GETA_3B - -/* We'll very rarely have sections longer than LONG_MAX, but we'll make a - feeble attempt at getting 64-bit values. */ -#define PUSHJSTUB_MAX ((offsetT) (((addressT) -1) >> 1)) -#define PUSHJSTUB_MIN (-PUSHJSTUB_MAX - 1) - -#define JMP_0F (65536 * 256 * 4 - 8) -#define JMP_0B (-65536 * 256 * 4 - 4) - -#define JMP_MAX_LEN 5 * 4 -#define JMP_4F 0 -#define JMP_4B 0 - -#define RELAX_ENCODE_SHIFT 1 -#define ENCODE_RELAX(what, length) (((what) << RELAX_ENCODE_SHIFT) + (length)) - -const relax_typeS mmix_relax_table[] = - { - /* Error sentinel (0, 0). */ - {1, 1, 0, 0}, - - /* Unused (0, 1). */ - {1, 1, 0, 0}, - - /* GETA (1, 0). */ - {GETA_0F, GETA_0B, 0, ENCODE_RELAX (STATE_GETA, STATE_MAX)}, - - /* GETA (1, 1). */ - {GETA_3F, GETA_3B, - GETA_MAX_LEN - 4, 0}, - - /* BCC (2, 0). */ - {BCC_0F, BCC_0B, 0, ENCODE_RELAX (STATE_BCC, STATE_MAX)}, - - /* BCC (2, 1). */ - {BCC_5F, BCC_5B, - BCC_MAX_LEN - 4, 0}, - - /* PUSHJ (3, 0). Next state is actually PUSHJSTUB (6, 0). */ - {PUSHJ_0F, PUSHJ_0B, 0, ENCODE_RELAX (STATE_PUSHJSTUB, STATE_ZERO)}, - - /* PUSHJ (3, 1). */ - {PUSHJ_4F, PUSHJ_4B, - PUSHJ_MAX_LEN - 4, 0}, - - /* JMP (4, 0). */ - {JMP_0F, JMP_0B, 0, ENCODE_RELAX (STATE_JMP, STATE_MAX)}, - - /* JMP (4, 1). */ - {JMP_4F, JMP_4B, - JMP_MAX_LEN - 4, 0}, - - /* GREG (5, 0), (5, 1), though the table entry isn't used. */ - {0, 0, 0, 0}, {0, 0, 0, 0}, - - /* PUSHJSTUB (6, 0). PUSHJ (3, 0) uses the range, so we set it to infinite. */ - {PUSHJSTUB_MAX, PUSHJSTUB_MIN, - 0, ENCODE_RELAX (STATE_PUSHJ, STATE_MAX)}, - /* PUSHJSTUB (6, 1) isn't used. */ - {0, 0, PUSHJ_MAX_LEN, 0} -}; - -const pseudo_typeS md_pseudo_table[] = - { - /* Support " .greg sym,expr" syntax. */ - {"greg", s_greg, 0}, - - /* Support " .bspec expr" syntax. */ - {"bspec", s_bspec, 1}, - - /* Support " .espec" syntax. */ - {"espec", s_espec, 1}, - - /* Support " .local $45" syntax. */ - {"local", mmix_s_local, 1}, - - {NULL, 0, 0} - }; - -const char mmix_comment_chars[] = "%!"; - -/* A ':' is a valid symbol character in mmixal. It's the prefix - delimiter, but other than that, it works like a symbol character, - except that we strip one off at the beginning of symbols. An '@' is a - symbol by itself (for the current location); space around it must not - be stripped. */ -const char mmix_symbol_chars[] = ":@"; - -const char line_comment_chars[] = "*#"; - -const char line_separator_chars[] = ";"; - -const char mmix_exp_chars[] = "eE"; - -const char mmix_flt_chars[] = "rf"; - - -/* Fill in the offset-related part of GETA or Bcc. */ - -static void -mmix_set_geta_branch_offset (char *opcodep, offsetT value) -{ - if (value < 0) - { - value += 65536 * 4; - opcodep[0] |= 1; - } - - value /= 4; - md_number_to_chars (opcodep + 2, value, 2); -} - -/* Fill in the offset-related part of JMP. */ - -static void -mmix_set_jmp_offset (char *opcodep, offsetT value) -{ - if (value < 0) - { - value += 65536 * 256 * 4; - opcodep[0] |= 1; - } - - value /= 4; - md_number_to_chars (opcodep + 1, value, 3); -} - -/* Fill in NOP:s for the expanded part of GETA/JMP/Bcc/PUSHJ. */ - -static void -mmix_fill_nops (char *opcodep, int n) -{ - int i; - - for (i = 0; i < n; i++) - md_number_to_chars (opcodep + i * 4, SWYM_INSN_BYTE << 24, 4); -} - -/* See macro md_parse_name in tc-mmix.h. */ - -int -mmix_current_location (void (*fn) (expressionS *), expressionS *exp) -{ - (*fn) (exp); - - return 1; -} - -/* Get up to three operands, filling them into the exp array. - General idea and code stolen from the tic80 port. */ - -static int -get_operands (int max_operands, char *s, expressionS *exp) -{ - char *p = s; - int numexp = 0; - int nextchar = ','; - - while (nextchar == ',') - { - /* Skip leading whitespace */ - while (*p == ' ' || *p == '\t') - p++; - - /* Check to see if we have any operands left to parse */ - if (*p == 0 || *p == '\n' || *p == '\r') - { - break; - } - else if (numexp == max_operands) - { - /* This seems more sane than saying "too many operands". We'll - get here only if the trailing trash starts with a comma. */ - as_bad (_("invalid operands")); - mmix_discard_rest_of_line (); - return 0; - } - - /* Begin operand parsing at the current scan point. */ - - input_line_pointer = p; - expression (&exp[numexp]); - - if (exp[numexp].X_op == O_illegal) - { - as_bad (_("invalid operands")); - } - else if (exp[numexp].X_op == O_absent) - { - as_bad (_("missing operand")); - } - - numexp++; - p = input_line_pointer; - - /* Skip leading whitespace */ - while (*p == ' ' || *p == '\t') - p++; - nextchar = *p++; - } - - /* If we allow "naked" comments, ignore the rest of the line. */ - if (nextchar != ',') - { - mmix_handle_rest_of_empty_line (); - input_line_pointer--; - } - - /* Mark the end of the valid operands with an illegal expression. */ - exp[numexp].X_op = O_illegal; - - return (numexp); -} - -/* Get the value of a special register, or -1 if the name does not match - one. NAME is a null-terminated string. */ - -static int -get_spec_regno (char *name) -{ - int i; - - if (name == NULL) - return -1; - - if (*name == ':') - name++; - - /* Well, it's a short array and we'll most often just match the first - entry, rJ. */ - for (i = 0; mmix_spec_regs[i].name != NULL; i++) - if (strcmp (name, mmix_spec_regs[i].name) == 0) - return mmix_spec_regs[i].number; - - return -1; -} - -/* For GET and PUT, parse the register names "manually", so we don't use - user labels. */ -static int -get_putget_operands (struct mmix_opcode *insn, char *operands, - expressionS *exp) -{ - expressionS *expp_reg; - expressionS *expp_sreg; - char *sregp = NULL; - char *sregend = operands; - char *p = operands; - char c = *sregend; - int regno; - - /* Skip leading whitespace */ - while (*p == ' ' || *p == '\t') - p++; - - input_line_pointer = p; - - /* Initialize both possible operands to error state, in case we never - get further. */ - exp[0].X_op = O_illegal; - exp[1].X_op = O_illegal; - - if (insn->operands == mmix_operands_get) - { - expp_reg = &exp[0]; - expp_sreg = &exp[1]; - - expression (expp_reg); - - p = input_line_pointer; - - /* Skip whitespace */ - while (*p == ' ' || *p == '\t') - p++; - - if (*p == ',') - { - p++; - - /* Skip whitespace */ - while (*p == ' ' || *p == '\t') - p++; - sregp = p; - input_line_pointer = sregp; - c = get_symbol_end (); - sregend = input_line_pointer; - } - } - else - { - expp_sreg = &exp[0]; - expp_reg = &exp[1]; - - sregp = p; - c = get_symbol_end (); - sregend = p = input_line_pointer; - *p = c; - - /* Skip whitespace */ - while (*p == ' ' || *p == '\t') - p++; - - if (*p == ',') - { - p++; - - /* Skip whitespace */ - while (*p == ' ' || *p == '\t') - p++; - - input_line_pointer = p; - expression (expp_reg); - } - *sregend = 0; - } - - regno = get_spec_regno (sregp); - *sregend = c; - - /* Let the caller issue errors; we've made sure the operands are - invalid. */ - if (expp_reg->X_op != O_illegal - && expp_reg->X_op != O_absent - && regno != -1) - { - expp_sreg->X_op = O_register; - expp_sreg->X_add_number = regno + 256; - } - - return 2; -} - -/* Handle MMIX-specific option. */ - -int -md_parse_option (int c, char *arg ATTRIBUTE_UNUSED) -{ - switch (c) - { - case 'x': - warn_on_expansion = 0; - allocate_undefined_gregs_in_linker = 1; - break; - - case OPTION_RELAX: - linkrelax = 1; - break; - - case OPTION_NOEXPAND: - expand_op = 0; - break; - - case OPTION_NOMERGEGREG: - merge_gregs = 0; - break; - - case OPTION_NOSYMS: - predefined_syms = 0; - equated_spec_regs = 0; - break; - - case OPTION_GNU_SYNTAX: - mmix_gnu_syntax = 1; - label_without_colon_this_line = 0; - break; - - case OPTION_GLOBALIZE_SYMBOLS: - mmix_globalize_symbols = 1; - break; - - case OPTION_FIXED_SPEC_REGS: - equated_spec_regs = 0; - break; - - case OPTION_LINKER_ALLOCATED_GREGS: - allocate_undefined_gregs_in_linker = 1; - break; - - case OPTION_NOPUSHJSTUBS: - pushj_stubs = 0; - break; - - default: - return 0; - } - - return 1; -} - -/* Display MMIX-specific help text. */ - -void -md_show_usage (FILE * stream) -{ - fprintf (stream, _(" MMIX-specific command line options:\n")); - fprintf (stream, _("\ - -fixed-special-register-names\n\ - Allow only the original special register names.\n")); - fprintf (stream, _("\ - -globalize-symbols Make all symbols global.\n")); - fprintf (stream, _("\ - -gnu-syntax Turn off mmixal syntax compatibility.\n")); - fprintf (stream, _("\ - -relax Create linker relaxable code.\n")); - fprintf (stream, _("\ - -no-predefined-syms Do not provide mmixal built-in constants.\n\ - Implies -fixed-special-register-names.\n")); - fprintf (stream, _("\ - -no-expand Do not expand GETA, branches, PUSHJ or JUMP\n\ - into multiple instructions.\n")); - fprintf (stream, _("\ - -no-merge-gregs Do not merge GREG definitions with nearby values.\n")); - fprintf (stream, _("\ - -linker-allocated-gregs If there's no suitable GREG definition for the\ - operands of an instruction, let the linker resolve.\n")); - fprintf (stream, _("\ - -x Do not warn when an operand to GETA, a branch,\n\ - PUSHJ or JUMP is not known to be within range.\n\ - The linker will catch any errors. Implies\n\ - -linker-allocated-gregs.")); -} - -/* Step to end of line, but don't step over the end of the line. */ - -static void -mmix_discard_rest_of_line (void) -{ - while (*input_line_pointer - && (! is_end_of_line[(unsigned char) *input_line_pointer] - || TC_EOL_IN_INSN (input_line_pointer))) - input_line_pointer++; -} - -/* Act as demand_empty_rest_of_line if we're in strict GNU syntax mode, - otherwise just ignore the rest of the line (and skip the end-of-line - delimiter). */ - -static void -mmix_handle_rest_of_empty_line (void) -{ - if (mmix_gnu_syntax) - demand_empty_rest_of_line (); - else - { - mmix_discard_rest_of_line (); - input_line_pointer++; - } -} - -/* Initialize GAS MMIX specifics. */ - -void -mmix_md_begin (void) -{ - int i; - const struct mmix_opcode *opcode; - - /* We assume nobody will use this, so don't allocate any room. */ - obstack_begin (&mmix_sym_obstack, 0); - - /* This will break the day the "lex" thingy changes. For now, it's the - only way to make ':' part of a name, and a name beginner. */ - lex_type[':'] = (LEX_NAME | LEX_BEGIN_NAME); - - mmix_opcode_hash = hash_new (); - - real_reg_section - = bfd_make_section_old_way (stdoutput, MMIX_REG_SECTION_NAME); - - for (opcode = mmix_opcodes; opcode->name; opcode++) - hash_insert (mmix_opcode_hash, opcode->name, (char *) opcode); - - /* We always insert the ordinary registers 0..255 as registers. */ - for (i = 0; i < 256; i++) - { - char buf[5]; - - /* Alternatively, we could diddle with '$' and the following number, - but keeping the registers as symbols helps keep parsing simple. */ - sprintf (buf, "$%d", i); - symbol_table_insert (symbol_new (buf, reg_section, i, - &zero_address_frag)); - } - - /* Insert mmixal built-in names if allowed. */ - if (predefined_syms) - { - for (i = 0; mmix_spec_regs[i].name != NULL; i++) - symbol_table_insert (symbol_new (mmix_spec_regs[i].name, - reg_section, - mmix_spec_regs[i].number + 256, - &zero_address_frag)); - - /* FIXME: Perhaps these should be recognized as specials; as field - names for those instructions. */ - symbol_table_insert (symbol_new ("ROUND_CURRENT", reg_section, 512, - &zero_address_frag)); - symbol_table_insert (symbol_new ("ROUND_OFF", reg_section, 512 + 1, - &zero_address_frag)); - symbol_table_insert (symbol_new ("ROUND_UP", reg_section, 512 + 2, - &zero_address_frag)); - symbol_table_insert (symbol_new ("ROUND_DOWN", reg_section, 512 + 3, - &zero_address_frag)); - symbol_table_insert (symbol_new ("ROUND_NEAR", reg_section, 512 + 4, - &zero_address_frag)); - } -} - -/* Assemble one insn in STR. */ - -void -md_assemble (char *str) -{ - char *operands = str; - char modified_char = 0; - struct mmix_opcode *instruction; - fragS *opc_fragP = NULL; - int max_operands = 3; - - /* Note that the struct frag member fr_literal in frags.h is char[], so - I have to make this a plain char *. */ - /* unsigned */ char *opcodep = NULL; - - expressionS exp[4]; - int n_operands = 0; - - /* Move to end of opcode. */ - for (operands = str; - is_part_of_name (*operands); - ++operands) - ; - - if (ISSPACE (*operands)) - { - modified_char = *operands; - *operands++ = '\0'; - } - - instruction = (struct mmix_opcode *) hash_find (mmix_opcode_hash, str); - if (instruction == NULL) - { - as_bad (_("unknown opcode: `%s'"), str); - - /* Avoid "unhandled label" errors. */ - pending_label = NULL; - return; - } - - /* Put back the character after the opcode. */ - if (modified_char != 0) - operands[-1] = modified_char; - - input_line_pointer = operands; - - /* Is this a mmixal pseudodirective? */ - if (instruction->type == mmix_type_pseudo) - { - /* For mmixal compatibility, a label for an instruction (and - emitting pseudo) refers to the _aligned_ address. We emit the - label here for the pseudos that don't handle it themselves. When - having an fb-label, emit it here, and increment the counter after - the pseudo. */ - switch (instruction->operands) - { - case mmix_operands_loc: - case mmix_operands_byte: - case mmix_operands_prefix: - case mmix_operands_local: - case mmix_operands_bspec: - case mmix_operands_espec: - if (current_fb_label >= 0) - colon (fb_label_name (current_fb_label, 1)); - else if (pending_label != NULL) - { - colon (pending_label); - pending_label = NULL; - } - break; - - default: - break; - } - - /* Some of the pseudos emit contents, others don't. Set a - contents-emitted flag when we emit something into .text */ - switch (instruction->operands) - { - case mmix_operands_loc: - /* LOC */ - s_loc (0); - break; - - case mmix_operands_byte: - /* BYTE */ - mmix_byte (); - break; - - case mmix_operands_wyde: - /* WYDE */ - mmix_cons (2); - break; - - case mmix_operands_tetra: - /* TETRA */ - mmix_cons (4); - break; - - case mmix_operands_octa: - /* OCTA */ - mmix_cons (8); - break; - - case mmix_operands_prefix: - /* PREFIX */ - s_prefix (0); - break; - - case mmix_operands_local: - /* LOCAL */ - mmix_s_local (0); - break; - - case mmix_operands_bspec: - /* BSPEC */ - s_bspec (0); - break; - - case mmix_operands_espec: - /* ESPEC */ - s_espec (0); - break; - - default: - BAD_CASE (instruction->operands); - } - - /* These are all working like the pseudo functions in read.c:s_..., - in that they step over the end-of-line marker at the end of the - line. We don't want that here. */ - input_line_pointer--; - - /* Step up the fb-label counter if there was a definition on this - line. */ - if (current_fb_label >= 0) - { - fb_label_instance_inc (current_fb_label); - current_fb_label = -1; - } - - /* Reset any don't-align-next-datum request, unless this was a LOC - directive. */ - if (instruction->operands != mmix_operands_loc) - want_unaligned = 0; - - return; - } - - /* Not a pseudo; we *will* emit contents. */ - if (now_seg == data_section) - { - if (lowest_data_loc != (bfd_vma) -1 && (lowest_data_loc & 3) != 0) - { - if (data_has_contents) - as_bad (_("specified location wasn't TETRA-aligned")); - else if (want_unaligned) - as_bad (_("unaligned data at an absolute location is not supported")); - - lowest_data_loc &= ~(bfd_vma) 3; - lowest_data_loc += 4; - } - - data_has_contents = 1; - } - else if (now_seg == text_section) - { - if (lowest_text_loc != (bfd_vma) -1 && (lowest_text_loc & 3) != 0) - { - if (text_has_contents) - as_bad (_("specified location wasn't TETRA-aligned")); - else if (want_unaligned) - as_bad (_("unaligned data at an absolute location is not supported")); - - lowest_text_loc &= ~(bfd_vma) 3; - lowest_text_loc += 4; - } - - text_has_contents = 1; - } - - /* After a sequence of BYTEs or WYDEs, we need to get to instruction - alignment. For other pseudos, a ".p2align 2" is supposed to be - inserted by the user. */ - if (last_alignment < 2 && ! want_unaligned) - { - frag_align (2, 0, 0); - record_alignment (now_seg, 2); - last_alignment = 2; - } - else - /* Reset any don't-align-next-datum request. */ - want_unaligned = 0; - - /* For mmixal compatibility, a label for an instruction (and emitting - pseudo) refers to the _aligned_ address. So we have to emit the - label here. */ - if (pending_label != NULL) - { - colon (pending_label); - pending_label = NULL; - } - - /* We assume that mmix_opcodes keeps having unique mnemonics for each - opcode, so we don't have to iterate over more than one opcode; if the - syntax does not match, then there's a syntax error. */ - - /* Operands have little or no context and are all comma-separated; it is - easier to parse each expression first. */ - switch (instruction->operands) - { - case mmix_operands_reg_yz: - case mmix_operands_pop: - case mmix_operands_regaddr: - case mmix_operands_pushj: - case mmix_operands_get: - case mmix_operands_put: - case mmix_operands_set: - case mmix_operands_save: - case mmix_operands_unsave: - max_operands = 2; - break; - - case mmix_operands_sync: - case mmix_operands_jmp: - case mmix_operands_resume: - max_operands = 1; - break; - - /* The original 3 is fine for the rest. */ - default: - break; - } - - /* If this is GET or PUT, and we don't do allow those names to be - equated, we need to parse the names ourselves, so we don't pick up a - user label instead of the special register. */ - if (! equated_spec_regs - && (instruction->operands == mmix_operands_get - || instruction->operands == mmix_operands_put)) - n_operands = get_putget_operands (instruction, operands, exp); - else - n_operands = get_operands (max_operands, operands, exp); - - /* If there's a fb-label on the current line, set that label. This must - be done *after* evaluating expressions of operands, since neither a - "1B" nor a "1F" refers to "1H" on the same line. */ - if (current_fb_label >= 0) - { - fb_label_instance_inc (current_fb_label); - colon (fb_label_name (current_fb_label, 0)); - current_fb_label = -1; - } - - /* We also assume that the length of the instruction is at least 4, the - size of an unexpanded instruction. We need a self-contained frag - since we want the relocation to point to the instruction, not the - variant part. */ - - opcodep = frag_more (4); - mmix_opcode_frag = opc_fragP = frag_now; - frag_now->fr_opcode = opcodep; - - /* Mark start of insn for DWARF2 debug features. */ - if (OUTPUT_FLAVOR == bfd_target_elf_flavour) - dwarf2_emit_insn (4); - - md_number_to_chars (opcodep, instruction->match, 4); - - switch (instruction->operands) - { - case mmix_operands_jmp: - if (n_operands == 0 && ! mmix_gnu_syntax) - /* Zeros are in place - nothing needs to be done when we have no - operands. */ - break; - - /* Add a frag for a JMP relaxation; we need room for max four - extra instructions. We don't do any work around here to check if - we can determine the offset right away. */ - if (n_operands != 1 || exp[0].X_op == O_register) - { - as_bad (_("invalid operand to opcode %s: `%s'"), - instruction->name, operands); - return; - } - - if (expand_op) - frag_var (rs_machine_dependent, 4 * 4, 0, - ENCODE_RELAX (STATE_JMP, STATE_UNDF), - exp[0].X_add_symbol, - exp[0].X_add_number, - opcodep); - else - fix_new_exp (opc_fragP, opcodep - opc_fragP->fr_literal, 4, - exp + 0, 1, BFD_RELOC_MMIX_ADDR27); - break; - - case mmix_operands_pushj: - /* We take care of PUSHJ in full here. */ - if (n_operands != 2 - || ((exp[0].X_op == O_constant || exp[0].X_op == O_register) - && (exp[0].X_add_number > 255 || exp[0].X_add_number < 0))) - { - as_bad (_("invalid operands to opcode %s: `%s'"), - instruction->name, operands); - return; - } - - if (exp[0].X_op == O_register || exp[0].X_op == O_constant) - opcodep[1] = exp[0].X_add_number; - else - fix_new_exp (opc_fragP, opcodep - opc_fragP->fr_literal + 1, - 1, exp + 0, 0, BFD_RELOC_MMIX_REG_OR_BYTE); - - if (expand_op) - frag_var (rs_machine_dependent, PUSHJ_MAX_LEN - 4, 0, - ENCODE_RELAX (STATE_PUSHJ, STATE_UNDF), - exp[1].X_add_symbol, - exp[1].X_add_number, - opcodep); - else - fix_new_exp (opc_fragP, opcodep - opc_fragP->fr_literal, 4, - exp + 1, 1, BFD_RELOC_MMIX_ADDR19); - break; - - case mmix_operands_regaddr: - /* GETA/branch: Add a frag for relaxation. We don't do any work - around here to check if we can determine the offset right away. */ - if (n_operands != 2 || exp[1].X_op == O_register) - { - as_bad (_("invalid operands to opcode %s: `%s'"), - instruction->name, operands); - return; - } - - if (! expand_op) - fix_new_exp (opc_fragP, opcodep - opc_fragP->fr_literal, 4, - exp + 1, 1, BFD_RELOC_MMIX_ADDR19); - else if (instruction->type == mmix_type_condbranch) - frag_var (rs_machine_dependent, BCC_MAX_LEN - 4, 0, - ENCODE_RELAX (STATE_BCC, STATE_UNDF), - exp[1].X_add_symbol, - exp[1].X_add_number, - opcodep); - else - frag_var (rs_machine_dependent, GETA_MAX_LEN - 4, 0, - ENCODE_RELAX (STATE_GETA, STATE_UNDF), - exp[1].X_add_symbol, - exp[1].X_add_number, - opcodep); - break; - - default: - break; - } - - switch (instruction->operands) - { - case mmix_operands_regs: - /* We check the number of operands here, since we're in a - FALLTHROUGH sequence in the next switch. */ - if (n_operands != 3 || exp[2].X_op == O_constant) - { - as_bad (_("invalid operands to opcode %s: `%s'"), - instruction->name, operands); - return; - } - /* FALLTHROUGH. */ - case mmix_operands_regs_z: - if (n_operands != 3) - { - as_bad (_("invalid operands to opcode %s: `%s'"), - instruction->name, operands); - return; - } - /* FALLTHROUGH. */ - case mmix_operands_reg_yz: - case mmix_operands_roundregs_z: - case mmix_operands_roundregs: - case mmix_operands_regs_z_opt: - case mmix_operands_neg: - case mmix_operands_regaddr: - case mmix_operands_get: - case mmix_operands_set: - case mmix_operands_save: - if (n_operands < 1 - || (exp[0].X_op == O_register && exp[0].X_add_number > 255)) - { - as_bad (_("invalid operands to opcode %s: `%s'"), - instruction->name, operands); - return; - } - - if (exp[0].X_op == O_register) - opcodep[1] = exp[0].X_add_number; - else - fix_new_exp (opc_fragP, opcodep - opc_fragP->fr_literal + 1, - 1, exp + 0, 0, BFD_RELOC_MMIX_REG); - break; - - default: - ; - } - - /* A corresponding once-over for those who take an 8-bit constant as - their first operand. */ - switch (instruction->operands) - { - case mmix_operands_pushgo: - /* PUSHGO: X is a constant, but can be expressed as a register. - We handle X here and use the common machinery of T,X,3,$ for - the rest of the operands. */ - if (n_operands < 2 - || ((exp[0].X_op == O_constant || exp[0].X_op == O_register) - && (exp[0].X_add_number > 255 || exp[0].X_add_number < 0))) - { - as_bad (_("invalid operands to opcode %s: `%s'"), - instruction->name, operands); - return; - } - else if (exp[0].X_op == O_constant || exp[0].X_op == O_register) - opcodep[1] = exp[0].X_add_number; - else - fix_new_exp (opc_fragP, opcodep - opc_fragP->fr_literal + 1, - 1, exp + 0, 0, BFD_RELOC_MMIX_REG_OR_BYTE); - break; - - case mmix_operands_pop: - if ((n_operands == 0 || n_operands == 1) && ! mmix_gnu_syntax) - break; - /* FALLTHROUGH. */ - case mmix_operands_x_regs_z: - if (n_operands < 1 - || (exp[0].X_op == O_constant - && (exp[0].X_add_number > 255 - || exp[0].X_add_number < 0))) - { - as_bad (_("invalid operands to opcode %s: `%s'"), - instruction->name, operands); - return; - } - - if (exp[0].X_op == O_constant) - opcodep[1] = exp[0].X_add_number; - else - /* FIXME: This doesn't bring us unsignedness checking. */ - fix_new_exp (opc_fragP, opcodep - opc_fragP->fr_literal + 1, - 1, exp + 0, 0, BFD_RELOC_8); - default: - ; - } - - /* Handle the rest. */ - switch (instruction->operands) - { - case mmix_operands_set: - /* SET: Either two registers, "$X,$Y", with Z field as zero, or - "$X,YZ", meaning change the opcode to SETL. */ - if (n_operands != 2 - || (exp[1].X_op == O_constant - && (exp[1].X_add_number > 0xffff || exp[1].X_add_number < 0))) - { - as_bad (_("invalid operands to opcode %s: `%s'"), - instruction->name, operands); - return; - } - - if (exp[1].X_op == O_constant) - { - /* There's an ambiguity with "SET $0,Y" when Y isn't defined - yet. To keep things simple, we assume that Y is then a - register, and only change the opcode if Y is defined at this - point. - - There's no compatibility problem with mmixal, since it emits - errors if the field is not defined at this point. */ - md_number_to_chars (opcodep, SETL_INSN_BYTE, 1); - - opcodep[2] = (exp[1].X_add_number >> 8) & 255; - opcodep[3] = exp[1].X_add_number & 255; - break; - } - /* FALLTHROUGH. */ - case mmix_operands_x_regs_z: - /* SYNCD: "X,$Y,$Z|Z". */ - /* FALLTHROUGH. */ - case mmix_operands_regs: - /* Three registers, $X,$Y,$Z. */ - /* FALLTHROUGH. */ - case mmix_operands_regs_z: - /* Operands "$X,$Y,$Z|Z", number of arguments checked above. */ - /* FALLTHROUGH. */ - case mmix_operands_pushgo: - /* Operands "$X|X,$Y,$Z|Z", optional Z. */ - /* FALLTHROUGH. */ - case mmix_operands_regs_z_opt: - /* Operands "$X,$Y,$Z|Z", with $Z|Z being optional, default 0. Any - operands not completely decided yet are postponed to later in - assembly (but not until link-time yet). */ - - if ((n_operands != 2 && n_operands != 3) - || (exp[1].X_op == O_register && exp[1].X_add_number > 255) - || (n_operands == 3 - && ((exp[2].X_op == O_register - && exp[2].X_add_number > 255 - && mmix_gnu_syntax) - || (exp[2].X_op == O_constant - && (exp[2].X_add_number > 255 - || exp[2].X_add_number < 0))))) - { - as_bad (_("invalid operands to opcode %s: `%s'"), - instruction->name, operands); - return; - } - - if (n_operands == 2) - { - symbolS *sym; - - /* The last operand is immediate whenever we see just two - operands. */ - opcodep[0] |= IMM_OFFSET_BIT; - - /* Now, we could either have an implied "0" as the Z operand, or - it could be the constant of a "base address plus offset". It - depends on whether it is allowed; only memory operations, as - signified by instruction->type and "T" and "X" operand types, - and it depends on whether we find a register in the second - operand, exp[1]. */ - if (exp[1].X_op == O_register && exp[1].X_add_number <= 255) - { - /* A zero then; all done. */ - opcodep[2] = exp[1].X_add_number; - break; - } - - /* Not known as a register. Is base address plus offset - allowed, or can we assume that it is a register anyway? */ - if ((instruction->operands != mmix_operands_regs_z_opt - && instruction->operands != mmix_operands_x_regs_z - && instruction->operands != mmix_operands_pushgo) - || (instruction->type != mmix_type_memaccess_octa - && instruction->type != mmix_type_memaccess_tetra - && instruction->type != mmix_type_memaccess_wyde - && instruction->type != mmix_type_memaccess_byte - && instruction->type != mmix_type_memaccess_block - && instruction->type != mmix_type_jsr - && instruction->type != mmix_type_branch)) - { - fix_new_exp (opc_fragP, opcodep - opc_fragP->fr_literal + 2, - 1, exp + 1, 0, BFD_RELOC_MMIX_REG); - break; - } - - /* To avoid getting a NULL add_symbol for constants and then - catching a SEGV in write_relocs since it doesn't handle - constants well for relocs other than PC-relative, we need to - pass expressions as symbols and use fix_new, not fix_new_exp. */ - sym = make_expr_symbol (exp + 1); - - /* Now we know it can be a "base address plus offset". Add - proper fixup types so we can handle this later, when we've - parsed everything. */ - fix_new (opc_fragP, opcodep - opc_fragP->fr_literal + 2, - 8, sym, 0, 0, BFD_RELOC_MMIX_BASE_PLUS_OFFSET); - break; - } - - if (exp[1].X_op == O_register) - opcodep[2] = exp[1].X_add_number; - else - fix_new_exp (opc_fragP, opcodep - opc_fragP->fr_literal + 2, - 1, exp + 1, 0, BFD_RELOC_MMIX_REG); - - /* In mmixal compatibility mode, we allow special registers as - constants for the Z operand. They have 256 added to their - register numbers, so the right thing will happen if we just treat - those as constants. */ - if (exp[2].X_op == O_register && exp[2].X_add_number <= 255) - opcodep[3] = exp[2].X_add_number; - else if (exp[2].X_op == O_constant - || (exp[2].X_op == O_register && exp[2].X_add_number > 255)) - { - opcodep[3] = exp[2].X_add_number; - opcodep[0] |= IMM_OFFSET_BIT; - } - else - fix_new_exp (opc_fragP, opcodep - opc_fragP->fr_literal + 3, - 1, exp + 2, 0, - (instruction->operands == mmix_operands_set - || instruction->operands == mmix_operands_regs) - ? BFD_RELOC_MMIX_REG : BFD_RELOC_MMIX_REG_OR_BYTE); - break; - - case mmix_operands_pop: - /* POP, one eight and one 16-bit operand. */ - if (n_operands == 0 && ! mmix_gnu_syntax) - break; - if (n_operands == 1 && ! mmix_gnu_syntax) - goto a_single_24_bit_number_operand; - /* FALLTHROUGH. */ - case mmix_operands_reg_yz: - /* A register and a 16-bit unsigned number. */ - if (n_operands != 2 - || exp[1].X_op == O_register - || (exp[1].X_op == O_constant - && (exp[1].X_add_number > 0xffff || exp[1].X_add_number < 0))) - { - as_bad (_("invalid operands to opcode %s: `%s'"), - instruction->name, operands); - return; - } - - if (exp[1].X_op == O_constant) - { - opcodep[2] = (exp[1].X_add_number >> 8) & 255; - opcodep[3] = exp[1].X_add_number & 255; - } - else - /* FIXME: This doesn't bring us unsignedness checking. */ - fix_new_exp (opc_fragP, opcodep - opc_fragP->fr_literal + 2, - 2, exp + 1, 0, BFD_RELOC_16); - break; - - case mmix_operands_jmp: - /* A JMP. Everything is already done. */ - break; - - case mmix_operands_roundregs: - /* Two registers with optional rounding mode or constant in between. */ - if ((n_operands == 3 && exp[2].X_op == O_constant) - || (n_operands == 2 && exp[1].X_op == O_constant)) - { - as_bad (_("invalid operands to opcode %s: `%s'"), - instruction->name, operands); - return; - } - /* FALLTHROUGH. */ - case mmix_operands_roundregs_z: - /* Like FLOT, "$X,ROUND_MODE,$Z|Z", but the rounding mode is - optional and can be the corresponding constant. */ - { - /* Which exp index holds the second operand (not the rounding - mode). */ - int op2no = n_operands - 1; - - if ((n_operands != 2 && n_operands != 3) - || ((exp[op2no].X_op == O_register - && exp[op2no].X_add_number > 255) - || (exp[op2no].X_op == O_constant - && (exp[op2no].X_add_number > 255 - || exp[op2no].X_add_number < 0))) - || (n_operands == 3 - /* We don't allow for the rounding mode to be deferred; it - must be determined in the "first pass". It cannot be a - symbol equated to a rounding mode, but defined after - the first use. */ - && ((exp[1].X_op == O_register - && exp[1].X_add_number < 512) - || (exp[1].X_op == O_constant - && exp[1].X_add_number < 0 - && exp[1].X_add_number > 4) - || (exp[1].X_op != O_register - && exp[1].X_op != O_constant)))) - { - as_bad (_("invalid operands to opcode %s: `%s'"), - instruction->name, operands); - return; - } - - /* Add rounding mode if present. */ - if (n_operands == 3) - opcodep[2] = exp[1].X_add_number & 255; - - if (exp[op2no].X_op == O_register) - opcodep[3] = exp[op2no].X_add_number; - else if (exp[op2no].X_op == O_constant) - { - opcodep[3] = exp[op2no].X_add_number; - opcodep[0] |= IMM_OFFSET_BIT; - } - else - fix_new_exp (opc_fragP, opcodep - opc_fragP->fr_literal + 3, - 1, exp + op2no, 0, - instruction->operands == mmix_operands_roundregs - ? BFD_RELOC_MMIX_REG - : BFD_RELOC_MMIX_REG_OR_BYTE); - break; - } - - case mmix_operands_sync: - a_single_24_bit_number_operand: - if (n_operands != 1 - || exp[0].X_op == O_register - || (exp[0].X_op == O_constant - && (exp[0].X_add_number > 0xffffff || exp[0].X_add_number < 0))) - { - as_bad (_("invalid operands to opcode %s: `%s'"), - instruction->name, operands); - return; - } - - if (exp[0].X_op == O_constant) - { - opcodep[1] = (exp[0].X_add_number >> 16) & 255; - opcodep[2] = (exp[0].X_add_number >> 8) & 255; - opcodep[3] = exp[0].X_add_number & 255; - } - else - /* FIXME: This doesn't bring us unsignedness checking. */ - fix_new_exp (opc_fragP, opcodep - opc_fragP->fr_literal + 1, - 3, exp + 0, 0, BFD_RELOC_24); - break; - - case mmix_operands_neg: - /* Operands "$X,Y,$Z|Z"; NEG or NEGU. Y is optional, 0 is default. */ - - if ((n_operands != 3 && n_operands != 2) - || (n_operands == 3 && exp[1].X_op == O_register) - || ((exp[1].X_op == O_constant || exp[1].X_op == O_register) - && (exp[1].X_add_number > 255 || exp[1].X_add_number < 0)) - || (n_operands == 3 - && ((exp[2].X_op == O_register && exp[2].X_add_number > 255) - || (exp[2].X_op == O_constant - && (exp[2].X_add_number > 255 - || exp[2].X_add_number < 0))))) - { - as_bad (_("invalid operands to opcode %s: `%s'"), - instruction->name, operands); - return; - } - - if (n_operands == 2) - { - if (exp[1].X_op == O_register) - opcodep[3] = exp[1].X_add_number; - else if (exp[1].X_op == O_constant) - { - opcodep[3] = exp[1].X_add_number; - opcodep[0] |= IMM_OFFSET_BIT; - } - else - fix_new_exp (opc_fragP, opcodep - opc_fragP->fr_literal + 3, - 1, exp + 1, 0, BFD_RELOC_MMIX_REG_OR_BYTE); - break; - } - - if (exp[1].X_op == O_constant) - opcodep[2] = exp[1].X_add_number; - else - fix_new_exp (opc_fragP, opcodep - opc_fragP->fr_literal + 2, - 1, exp + 1, 0, BFD_RELOC_8); - - if (exp[2].X_op == O_register) - opcodep[3] = exp[2].X_add_number; - else if (exp[2].X_op == O_constant) - { - opcodep[3] = exp[2].X_add_number; - opcodep[0] |= IMM_OFFSET_BIT; - } - else - fix_new_exp (opc_fragP, opcodep - opc_fragP->fr_literal + 3, - 1, exp + 2, 0, BFD_RELOC_MMIX_REG_OR_BYTE); - break; - - case mmix_operands_regaddr: - /* A GETA/branch-type. */ - break; - - case mmix_operands_get: - /* "$X,spec_reg"; GET. - Like with rounding modes, we demand that the special register or - symbol is already defined when we get here at the point of use. */ - if (n_operands != 2 - || (exp[1].X_op == O_register - && (exp[1].X_add_number < 256 || exp[1].X_add_number >= 512)) - || (exp[1].X_op == O_constant - && (exp[1].X_add_number < 0 || exp[1].X_add_number > 256)) - || (exp[1].X_op != O_constant && exp[1].X_op != O_register)) - { - as_bad (_("invalid operands to opcode %s: `%s'"), - instruction->name, operands); - return; - } - - opcodep[3] = exp[1].X_add_number - 256; - break; - - case mmix_operands_put: - /* "spec_reg,$Z|Z"; PUT. */ - if (n_operands != 2 - || (exp[0].X_op == O_register - && (exp[0].X_add_number < 256 || exp[0].X_add_number >= 512)) - || (exp[0].X_op == O_constant - && (exp[0].X_add_number < 0 || exp[0].X_add_number > 256)) - || (exp[0].X_op != O_constant && exp[0].X_op != O_register)) - { - as_bad (_("invalid operands to opcode %s: `%s'"), - instruction->name, operands); - return; - } - - opcodep[1] = exp[0].X_add_number - 256; - - /* Note that the Y field is zero. */ - - if (exp[1].X_op == O_register) - opcodep[3] = exp[1].X_add_number; - else if (exp[1].X_op == O_constant) - { - opcodep[3] = exp[1].X_add_number; - opcodep[0] |= IMM_OFFSET_BIT; - } - else - fix_new_exp (opc_fragP, opcodep - opc_fragP->fr_literal + 3, - 1, exp + 1, 0, BFD_RELOC_MMIX_REG_OR_BYTE); - break; - - case mmix_operands_save: - /* "$X,0"; SAVE. */ - if (n_operands != 2 - || exp[1].X_op != O_constant - || exp[1].X_add_number != 0) - { - as_bad (_("invalid operands to opcode %s: `%s'"), - instruction->name, operands); - return; - } - break; - - case mmix_operands_unsave: - if (n_operands < 2 && ! mmix_gnu_syntax) - { - if (n_operands == 1) - { - if (exp[0].X_op == O_register) - opcodep[3] = exp[0].X_add_number; - else - fix_new_exp (opc_fragP, opcodep - opc_fragP->fr_literal + 3, - 1, exp, 0, BFD_RELOC_MMIX_REG); - } - break; - } - - /* "0,$Z"; UNSAVE. */ - if (n_operands != 2 - || exp[0].X_op != O_constant - || exp[0].X_add_number != 0 - || exp[1].X_op == O_constant - || (exp[1].X_op == O_register - && exp[1].X_add_number > 255)) - { - as_bad (_("invalid operands to opcode %s: `%s'"), - instruction->name, operands); - return; - } - - if (exp[1].X_op == O_register) - opcodep[3] = exp[1].X_add_number; - else - fix_new_exp (opc_fragP, opcodep - opc_fragP->fr_literal + 3, - 1, exp + 1, 0, BFD_RELOC_MMIX_REG); - break; - - case mmix_operands_xyz_opt: - /* SWYM, TRIP, TRAP: zero, one, two or three operands. */ - if (n_operands == 0 && ! mmix_gnu_syntax) - /* Zeros are in place - nothing needs to be done for zero - operands. We don't allow this in GNU syntax mode, because it - was believed that the risk of missing to supply an operand is - higher than the benefit of not having to specify a zero. */ - ; - else if (n_operands == 1 && exp[0].X_op != O_register) - { - if (exp[0].X_op == O_constant) - { - if (exp[0].X_add_number > 255*255*255 - || exp[0].X_add_number < 0) - { - as_bad (_("invalid operands to opcode %s: `%s'"), - instruction->name, operands); - return; - } - else - { - opcodep[1] = (exp[0].X_add_number >> 16) & 255; - opcodep[2] = (exp[0].X_add_number >> 8) & 255; - opcodep[3] = exp[0].X_add_number & 255; - } - } - else - fix_new_exp (opc_fragP, opcodep - opc_fragP->fr_literal + 1, - 3, exp, 0, BFD_RELOC_24); - } - else if (n_operands == 2 - && exp[0].X_op != O_register - && exp[1].X_op != O_register) - { - /* Two operands. */ - - if (exp[0].X_op == O_constant) - { - if (exp[0].X_add_number > 255 - || exp[0].X_add_number < 0) - { - as_bad (_("invalid operands to opcode %s: `%s'"), - instruction->name, operands); - return; - } - else - opcodep[1] = exp[0].X_add_number & 255; - } - else - fix_new_exp (opc_fragP, opcodep - opc_fragP->fr_literal + 1, - 1, exp, 0, BFD_RELOC_8); - - if (exp[1].X_op == O_constant) - { - if (exp[1].X_add_number > 255*255 - || exp[1].X_add_number < 0) - { - as_bad (_("invalid operands to opcode %s: `%s'"), - instruction->name, operands); - return; - } - else - { - opcodep[2] = (exp[1].X_add_number >> 8) & 255; - opcodep[3] = exp[1].X_add_number & 255; - } - } - else - fix_new_exp (opc_fragP, opcodep - opc_fragP->fr_literal + 2, - 2, exp + 1, 0, BFD_RELOC_16); - } - else if (n_operands == 3 - && exp[0].X_op != O_register - && exp[1].X_op != O_register - && exp[2].X_op != O_register) - { - /* Three operands. */ - - if (exp[0].X_op == O_constant) - { - if (exp[0].X_add_number > 255 - || exp[0].X_add_number < 0) - { - as_bad (_("invalid operands to opcode %s: `%s'"), - instruction->name, operands); - return; - } - else - opcodep[1] = exp[0].X_add_number & 255; - } - else - fix_new_exp (opc_fragP, opcodep - opc_fragP->fr_literal + 1, - 1, exp, 0, BFD_RELOC_8); - - if (exp[1].X_op == O_constant) - { - if (exp[1].X_add_number > 255 - || exp[1].X_add_number < 0) - { - as_bad (_("invalid operands to opcode %s: `%s'"), - instruction->name, operands); - return; - } - else - opcodep[2] = exp[1].X_add_number & 255; - } - else - fix_new_exp (opc_fragP, opcodep - opc_fragP->fr_literal + 2, - 1, exp + 1, 0, BFD_RELOC_8); - - if (exp[2].X_op == O_constant) - { - if (exp[2].X_add_number > 255 - || exp[2].X_add_number < 0) - { - as_bad (_("invalid operands to opcode %s: `%s'"), - instruction->name, operands); - return; - } - else - opcodep[3] = exp[2].X_add_number & 255; - } - else - fix_new_exp (opc_fragP, opcodep - opc_fragP->fr_literal + 3, - 1, exp + 2, 0, BFD_RELOC_8); - } - else if (n_operands <= 3 - && (strcmp (instruction->name, "trip") == 0 - || strcmp (instruction->name, "trap") == 0)) - { - /* The meaning of operands to TRIP and TRAP are not defined, so - we add combinations not handled above here as we find them. */ - if (n_operands == 3) - { - /* Don't require non-register operands. Always generate - fixups, so we don't have to copy lots of code and create - maintenance problems. TRIP is supposed to be a rare - instruction, so the overhead should not matter. We - aren't allowed to fix_new_exp for an expression which is - an O_register at this point, however. */ - if (exp[0].X_op == O_register) - opcodep[1] = exp[0].X_add_number; - else - fix_new_exp (opc_fragP, opcodep - opc_fragP->fr_literal + 1, - 1, exp, 0, BFD_RELOC_MMIX_REG_OR_BYTE); - if (exp[1].X_op == O_register) - opcodep[2] = exp[1].X_add_number; - else - fix_new_exp (opc_fragP, opcodep - opc_fragP->fr_literal + 2, - 1, exp + 1, 0, BFD_RELOC_MMIX_REG_OR_BYTE); - if (exp[2].X_op == O_register) - opcodep[3] = exp[2].X_add_number; - else - fix_new_exp (opc_fragP, opcodep - opc_fragP->fr_literal + 3, - 1, exp + 2, 0, BFD_RELOC_MMIX_REG_OR_BYTE); - } - else if (n_operands == 2) - { - if (exp[0].X_op == O_register) - opcodep[2] = exp[0].X_add_number; - else - fix_new_exp (opc_fragP, opcodep - opc_fragP->fr_literal + 2, - 1, exp, 0, BFD_RELOC_MMIX_REG_OR_BYTE); - if (exp[1].X_op == O_register) - opcodep[3] = exp[1].X_add_number; - else - fix_new_exp (opc_fragP, opcodep - opc_fragP->fr_literal + 3, - 1, exp + 1, 0, BFD_RELOC_MMIX_REG_OR_BYTE); - } - else - { - as_bad (_("unsupported operands to %s: `%s'"), - instruction->name, operands); - return; - } - } - else - { - as_bad (_("invalid operands to opcode %s: `%s'"), - instruction->name, operands); - return; - } - break; - - case mmix_operands_resume: - if (n_operands == 0 && ! mmix_gnu_syntax) - break; - - if (n_operands != 1 - || exp[0].X_op == O_register - || (exp[0].X_op == O_constant - && (exp[0].X_add_number < 0 - || exp[0].X_add_number > 255))) - { - as_bad (_("invalid operands to opcode %s: `%s'"), - instruction->name, operands); - return; - } - - if (exp[0].X_op == O_constant) - opcodep[3] = exp[0].X_add_number; - else - fix_new_exp (opc_fragP, opcodep - opc_fragP->fr_literal + 3, - 1, exp + 0, 0, BFD_RELOC_8); - break; - - case mmix_operands_pushj: - /* All is done for PUSHJ already. */ - break; - - default: - BAD_CASE (instruction->operands); - } -} - -/* For the benefit of insns that start with a digit, we assemble by way of - tc_unrecognized_line too, through this function. */ - -int -mmix_assemble_return_nonzero (char *str) -{ - int last_error_count = had_errors (); - char *s2 = str; - char c; - - /* Normal instruction handling downcases, so we must too. */ - while (ISALNUM (*s2)) - { - if (ISUPPER ((unsigned char) *s2)) - *s2 = TOLOWER (*s2); - s2++; - } - - /* Cut the line for sake of the assembly. */ - for (s2 = str; *s2 && *s2 != '\n'; s2++) - ; - - c = *s2; - *s2 = 0; - md_assemble (str); - *s2 = c; - - return had_errors () == last_error_count; -} - -/* The PREFIX pseudo. */ - -static void -s_prefix (int unused ATTRIBUTE_UNUSED) -{ - char *p; - int c; - - SKIP_WHITESPACE (); - - p = input_line_pointer; - - c = get_symbol_end (); - - /* Reseting prefix? */ - if (*p == ':' && p[1] == 0) - mmix_current_prefix = NULL; - else - { - /* Put this prefix on the mmix symbols obstack. We could malloc and - free it separately, but then we'd have to worry about that. - People using up memory on prefixes have other problems. */ - obstack_grow (&mmix_sym_obstack, p, strlen (p) + 1); - p = obstack_finish (&mmix_sym_obstack); - - /* Accumulate prefixes, and strip a leading ':'. */ - if (mmix_current_prefix != NULL || *p == ':') - p = mmix_prefix_name (p); - - mmix_current_prefix = p; - } - - *input_line_pointer = c; - - mmix_handle_rest_of_empty_line (); -} - -/* We implement prefixes by using the tc_canonicalize_symbol_name hook, - and store each prefixed name on a (separate) obstack. This means that - the name is on the "notes" obstack in non-prefixed form and on the - mmix_sym_obstack in prefixed form, but currently it is not worth - rewriting the whole GAS symbol handling to improve "hooking" to avoid - that. (It might be worth a rewrite for other reasons, though). */ - -char * -mmix_prefix_name (char *shortname) -{ - if (*shortname == ':') - return shortname + 1; - - if (mmix_current_prefix == NULL) - as_fatal (_("internal: mmix_prefix_name but empty prefix")); - - if (*shortname == '$') - return shortname; - - obstack_grow (&mmix_sym_obstack, mmix_current_prefix, - strlen (mmix_current_prefix)); - obstack_grow (&mmix_sym_obstack, shortname, strlen (shortname) + 1); - return obstack_finish (&mmix_sym_obstack); -} - -/* The GREG pseudo. At LABEL, we have the name of a symbol that we - want to make a register symbol, and which should be initialized with - the value in the expression at INPUT_LINE_POINTER (defaulting to 0). - Either and (perhaps less meaningful) both may be missing. LABEL must - be persistent, perhaps allocated on an obstack. */ - -static void -mmix_greg_internal (char *label) -{ - expressionS *expP = &mmix_raw_gregs[n_of_raw_gregs].exp; - - /* Don't set the section to register contents section before the - expression has been parsed; it may refer to the current position. */ - expression (expP); - - /* FIXME: Check that no expression refers to the register contents - section. May need to be done in elf64-mmix.c. */ - if (expP->X_op == O_absent) - { - /* Default to zero if the expression was absent. */ - expP->X_op = O_constant; - expP->X_add_number = 0; - expP->X_unsigned = 0; - expP->X_add_symbol = NULL; - expP->X_op_symbol = NULL; - } - - /* We must handle prefixes here, as we save the labels and expressions - to be output later. */ - mmix_raw_gregs[n_of_raw_gregs].label - = mmix_current_prefix == NULL ? label : mmix_prefix_name (label); - - if (n_of_raw_gregs == MAX_GREGS - 1) - as_bad (_("too many GREG registers allocated (max %d)"), MAX_GREGS); - else - n_of_raw_gregs++; - - mmix_handle_rest_of_empty_line (); -} - -/* The ".greg label,expr" worker. */ - -static void -s_greg (int unused ATTRIBUTE_UNUSED) -{ - char *p; - char c; - p = input_line_pointer; - - /* This will skip over what can be a symbol and zero out the next - character, which we assume is a ',' or other meaningful delimiter. - What comes after that is the initializer expression for the - register. */ - c = get_symbol_end (); - - if (! is_end_of_line[(unsigned char) c]) - input_line_pointer++; - - if (*p) - { - /* The label must be persistent; it's not used until after all input - has been seen. */ - obstack_grow (&mmix_sym_obstack, p, strlen (p) + 1); - mmix_greg_internal (obstack_finish (&mmix_sym_obstack)); - } - else - mmix_greg_internal (NULL); -} - -/* The "BSPEC expr" worker. */ - -static void -s_bspec (int unused ATTRIBUTE_UNUSED) -{ - asection *expsec; - asection *sec; - char secname[sizeof (MMIX_OTHER_SPEC_SECTION_PREFIX) + 20] - = MMIX_OTHER_SPEC_SECTION_PREFIX; - expressionS exp; - int n; - - /* Get a constant expression which we can evaluate *now*. Supporting - more complex (though assembly-time computable) expressions is - feasible but Too Much Work for something of unknown usefulness like - BSPEC-ESPEC. */ - expsec = expression (&exp); - mmix_handle_rest_of_empty_line (); - - /* Check that we don't have another BSPEC in progress. */ - if (doing_bspec) - { - as_bad (_("BSPEC already active. Nesting is not supported.")); - return; - } - - if (exp.X_op != O_constant - || expsec != absolute_section - || exp.X_add_number < 0 - || exp.X_add_number > 65535) - { - as_bad (_("invalid BSPEC expression")); - exp.X_add_number = 0; - } - - n = (int) exp.X_add_number; - - sprintf (secname + strlen (MMIX_OTHER_SPEC_SECTION_PREFIX), "%d", n); - sec = bfd_get_section_by_name (stdoutput, secname); - if (sec == NULL) - { - /* We need a non-volatile name as it will be stored in the section - struct. */ - char *newsecname = xstrdup (secname); - sec = bfd_make_section (stdoutput, newsecname); - - if (sec == NULL) - as_fatal (_("can't create section %s"), newsecname); - - if (!bfd_set_section_flags (stdoutput, sec, - bfd_get_section_flags (stdoutput, sec) - | SEC_READONLY)) - as_fatal (_("can't set section flags for section %s"), newsecname); - } - - /* Tell ELF about the pending section change. */ - obj_elf_section_change_hook (); - subseg_set (sec, 0); - - /* Save position for missing ESPEC. */ - as_where (&bspec_file, &bspec_line); - - doing_bspec = 1; -} - -/* The "ESPEC" worker. */ - -static void -s_espec (int unused ATTRIBUTE_UNUSED) -{ - /* First, check that we *do* have a BSPEC in progress. */ - if (! doing_bspec) - { - as_bad (_("ESPEC without preceding BSPEC")); - return; - } - - mmix_handle_rest_of_empty_line (); - doing_bspec = 0; - - /* When we told ELF about the section change in s_bspec, it stored the - previous section for us so we can get at it with the equivalent of a - .previous pseudo. */ - obj_elf_previous (0); -} - -/* The " .local expr" and " local expr" worker. We make a BFD_MMIX_LOCAL - relocation against the current position against the expression. - Implementing this by means of contents in a section lost. */ - -static void -mmix_s_local (int unused ATTRIBUTE_UNUSED) -{ - expressionS exp; - - /* Don't set the section to register contents section before the - expression has been parsed; it may refer to the current position in - some contorted way. */ - expression (&exp); - - if (exp.X_op == O_absent) - { - as_bad (_("missing local expression")); - return; - } - else if (exp.X_op == O_register) - { - /* fix_new_exp doesn't like O_register. Should be configurable. - We're fine with a constant here, though. */ - exp.X_op = O_constant; - } - - fix_new_exp (frag_now, 0, 0, &exp, 0, BFD_RELOC_MMIX_LOCAL); - mmix_handle_rest_of_empty_line (); -} - -/* Set fragP->fr_var to the initial guess of the size of a relaxable insn - and return it. Sizes of other instructions are not known. This - function may be called multiple times. */ - -int -md_estimate_size_before_relax (fragS *fragP, segT segment) -{ - int length; - -#define HANDLE_RELAXABLE(state) \ - case ENCODE_RELAX (state, STATE_UNDF): \ - if (fragP->fr_symbol != NULL \ - && S_GET_SEGMENT (fragP->fr_symbol) == segment \ - && !S_IS_WEAK (fragP->fr_symbol)) \ - { \ - /* The symbol lies in the same segment - a relaxable case. */ \ - fragP->fr_subtype \ - = ENCODE_RELAX (state, STATE_ZERO); \ - } \ - break; - - switch (fragP->fr_subtype) - { - HANDLE_RELAXABLE (STATE_GETA); - HANDLE_RELAXABLE (STATE_BCC); - HANDLE_RELAXABLE (STATE_JMP); - - case ENCODE_RELAX (STATE_PUSHJ, STATE_UNDF): - if (fragP->fr_symbol != NULL - && S_GET_SEGMENT (fragP->fr_symbol) == segment - && !S_IS_WEAK (fragP->fr_symbol)) - /* The symbol lies in the same segment - a relaxable case. */ - fragP->fr_subtype = ENCODE_RELAX (STATE_PUSHJ, STATE_ZERO); - else if (pushj_stubs) - /* If we're to generate stubs, assume we can reach a stub after - the section. */ - fragP->fr_subtype = ENCODE_RELAX (STATE_PUSHJSTUB, STATE_ZERO); - /* FALLTHROUGH. */ - case ENCODE_RELAX (STATE_PUSHJ, STATE_ZERO): - case ENCODE_RELAX (STATE_PUSHJSTUB, STATE_ZERO): - /* We need to distinguish different relaxation rounds. */ - seg_info (segment)->tc_segment_info_data.last_stubfrag = fragP; - break; - - case ENCODE_RELAX (STATE_GETA, STATE_ZERO): - case ENCODE_RELAX (STATE_BCC, STATE_ZERO): - case ENCODE_RELAX (STATE_JMP, STATE_ZERO): - /* When relaxing a section for the second time, we don't need to do - anything except making sure that fr_var is set right. */ - break; - - case STATE_GREG_DEF: - length = fragP->tc_frag_data != NULL ? 0 : 8; - fragP->fr_var = length; - - /* Don't consult the relax_table; it isn't valid for this - relaxation. */ - return length; - break; - - default: - BAD_CASE (fragP->fr_subtype); - } - - length = mmix_relax_table[fragP->fr_subtype].rlx_length; - fragP->fr_var = length; - - return length; -} - -/* Turn a string in input_line_pointer into a floating point constant of type - type, and store the appropriate bytes in *litP. The number of LITTLENUMS - emitted is stored in *sizeP . An error message is returned, or NULL on - OK. */ - -char * -md_atof (int type, char *litP, int *sizeP) -{ - int prec; - LITTLENUM_TYPE words[4]; - char *t; - int i; - - switch (type) - { - /* FIXME: Having 'f' in mmix_flt_chars (and here) makes it - problematic to also have a forward reference in an expression. - The testsuite wants it, and it's customary. - We'll deal with the real problems when they come; we share the - problem with most other ports. */ - case 'f': - case 'r': - prec = 2; - break; - case 'd': - prec = 4; - break; - default: - *sizeP = 0; - return _("bad call to md_atof"); - } - - t = atof_ieee (input_line_pointer, type, words); - if (t) - input_line_pointer = t; - - *sizeP = prec * 2; - - for (i = 0; i < prec; i++) - { - md_number_to_chars (litP, (valueT) words[i], 2); - litP += 2; - } - return NULL; -} - -/* Convert variable-sized frags into one or more fixups. */ - -void -md_convert_frag (bfd *abfd ATTRIBUTE_UNUSED, segT sec ATTRIBUTE_UNUSED, - fragS *fragP) -{ - /* Pointer to first byte in variable-sized part of the frag. */ - char *var_partp; - - /* Pointer to first opcode byte in frag. */ - char *opcodep; - - /* Size in bytes of variable-sized part of frag. */ - int var_part_size = 0; - - /* This is part of *fragP. It contains all information about addresses - and offsets to varying parts. */ - symbolS *symbolP; - unsigned long var_part_offset; - - /* This is the frag for the opcode. It, rather than fragP, must be used - when emitting a frag for the opcode. */ - fragS *opc_fragP = fragP->tc_frag_data; - fixS *tmpfixP; - - /* Where, in file space, does addr point? */ - bfd_vma target_address; - bfd_vma opcode_address; - - know (fragP->fr_type == rs_machine_dependent); - - var_part_offset = fragP->fr_fix; - var_partp = fragP->fr_literal + var_part_offset; - opcodep = fragP->fr_opcode; - - symbolP = fragP->fr_symbol; - - target_address - = ((symbolP ? S_GET_VALUE (symbolP) : 0) + fragP->fr_offset); - - /* The opcode that would be extended is the last four "fixed" bytes. */ - opcode_address = fragP->fr_address + fragP->fr_fix - 4; - - switch (fragP->fr_subtype) - { - case ENCODE_RELAX (STATE_PUSHJSTUB, STATE_ZERO): - /* Setting the unknown bits to 0 seems the most appropriate. */ - mmix_set_geta_branch_offset (opcodep, 0); - tmpfixP = fix_new (opc_fragP, opcodep - opc_fragP->fr_literal, 8, - fragP->fr_symbol, fragP->fr_offset, 1, - BFD_RELOC_MMIX_PUSHJ_STUBBABLE); - COPY_FR_WHERE_TO_FX (fragP, tmpfixP); - var_part_size = 0; - break; - - case ENCODE_RELAX (STATE_GETA, STATE_ZERO): - case ENCODE_RELAX (STATE_BCC, STATE_ZERO): - case ENCODE_RELAX (STATE_PUSHJ, STATE_ZERO): - mmix_set_geta_branch_offset (opcodep, target_address - opcode_address); - if (linkrelax) - { - tmpfixP - = fix_new (opc_fragP, opcodep - opc_fragP->fr_literal, 4, - fragP->fr_symbol, fragP->fr_offset, 1, - BFD_RELOC_MMIX_ADDR19); - COPY_FR_WHERE_TO_FX (fragP, tmpfixP); - } - var_part_size = 0; - break; - - case ENCODE_RELAX (STATE_JMP, STATE_ZERO): - mmix_set_jmp_offset (opcodep, target_address - opcode_address); - if (linkrelax) - { - tmpfixP - = fix_new (opc_fragP, opcodep - opc_fragP->fr_literal, 4, - fragP->fr_symbol, fragP->fr_offset, 1, - BFD_RELOC_MMIX_ADDR27); - COPY_FR_WHERE_TO_FX (fragP, tmpfixP); - } - var_part_size = 0; - break; - - case STATE_GREG_DEF: - if (fragP->tc_frag_data == NULL) - { - /* We must initialize data that's supposed to be "fixed up" to - avoid emitting garbage, because md_apply_fix won't do - anything for undefined symbols. */ - md_number_to_chars (var_partp, 0, 8); - tmpfixP - = fix_new (fragP, var_partp - fragP->fr_literal, 8, - fragP->fr_symbol, fragP->fr_offset, 0, BFD_RELOC_64); - COPY_FR_WHERE_TO_FX (fragP, tmpfixP); - mmix_gregs[n_of_cooked_gregs++] = tmpfixP; - var_part_size = 8; - } - else - var_part_size = 0; - break; - -#define HANDLE_MAX_RELOC(state, reloc) \ - case ENCODE_RELAX (state, STATE_MAX): \ - var_part_size \ - = mmix_relax_table[ENCODE_RELAX (state, STATE_MAX)].rlx_length; \ - mmix_fill_nops (var_partp, var_part_size / 4); \ - if (warn_on_expansion) \ - as_warn_where (fragP->fr_file, fragP->fr_line, \ - _("operand out of range, instruction expanded")); \ - tmpfixP = fix_new (fragP, var_partp - fragP->fr_literal - 4, 8, \ - fragP->fr_symbol, fragP->fr_offset, 1, reloc); \ - COPY_FR_WHERE_TO_FX (fragP, tmpfixP); \ - break - - HANDLE_MAX_RELOC (STATE_GETA, BFD_RELOC_MMIX_GETA); - HANDLE_MAX_RELOC (STATE_BCC, BFD_RELOC_MMIX_CBRANCH); - HANDLE_MAX_RELOC (STATE_PUSHJ, BFD_RELOC_MMIX_PUSHJ); - HANDLE_MAX_RELOC (STATE_JMP, BFD_RELOC_MMIX_JMP); - - default: - BAD_CASE (fragP->fr_subtype); - break; - } - - fragP->fr_fix += var_part_size; - fragP->fr_var = 0; -} - -/* Applies the desired value to the specified location. - Also sets up addends for RELA type relocations. - Stolen from tc-mcore.c. - - Note that this function isn't called when linkrelax != 0. */ - -void -md_apply_fix (fixS *fixP, valueT *valP, segT segment) -{ - char *buf = fixP->fx_where + fixP->fx_frag->fr_literal; - /* Note: use offsetT because it is signed, valueT is unsigned. */ - offsetT val = (offsetT) * valP; - segT symsec - = (fixP->fx_addsy == NULL - ? absolute_section : S_GET_SEGMENT (fixP->fx_addsy)); - - /* If the fix is relative to a symbol which is not defined, or, (if - pcrel), not in the same segment as the fix, we cannot resolve it - here. */ - if (fixP->fx_addsy != NULL - && (! S_IS_DEFINED (fixP->fx_addsy) - || S_IS_WEAK (fixP->fx_addsy) - || (fixP->fx_pcrel && symsec != segment) - || (! fixP->fx_pcrel - && symsec != absolute_section - && ((fixP->fx_r_type != BFD_RELOC_MMIX_REG - && fixP->fx_r_type != BFD_RELOC_MMIX_REG_OR_BYTE) - || symsec != reg_section)))) - { - fixP->fx_done = 0; - return; - } - else if (fixP->fx_r_type == BFD_RELOC_MMIX_LOCAL - || fixP->fx_r_type == BFD_RELOC_VTABLE_INHERIT - || fixP->fx_r_type == BFD_RELOC_VTABLE_ENTRY) - { - /* These are never "fixed". */ - fixP->fx_done = 0; - return; - } - else - /* We assume every other relocation is "fixed". */ - fixP->fx_done = 1; - - switch (fixP->fx_r_type) - { - case BFD_RELOC_64: - case BFD_RELOC_32: - case BFD_RELOC_24: - case BFD_RELOC_16: - case BFD_RELOC_8: - case BFD_RELOC_64_PCREL: - case BFD_RELOC_32_PCREL: - case BFD_RELOC_24_PCREL: - case BFD_RELOC_16_PCREL: - case BFD_RELOC_8_PCREL: - md_number_to_chars (buf, val, fixP->fx_size); - break; - - case BFD_RELOC_MMIX_ADDR19: - if (expand_op) - { - /* This shouldn't happen. */ - BAD_CASE (fixP->fx_r_type); - break; - } - /* FALLTHROUGH. */ - case BFD_RELOC_MMIX_GETA: - case BFD_RELOC_MMIX_CBRANCH: - case BFD_RELOC_MMIX_PUSHJ: - case BFD_RELOC_MMIX_PUSHJ_STUBBABLE: - /* If this fixup is out of range, punt to the linker to emit an - error. This should only happen with -no-expand. */ - if (val < -(((offsetT) 1 << 19)/2) - || val >= ((offsetT) 1 << 19)/2 - 1 - || (val & 3) != 0) - { - if (warn_on_expansion) - as_warn_where (fixP->fx_file, fixP->fx_line, - _("operand out of range")); - fixP->fx_done = 0; - val = 0; - } - mmix_set_geta_branch_offset (buf, val); - break; - - case BFD_RELOC_MMIX_ADDR27: - if (expand_op) - { - /* This shouldn't happen. */ - BAD_CASE (fixP->fx_r_type); - break; - } - /* FALLTHROUGH. */ - case BFD_RELOC_MMIX_JMP: - /* If this fixup is out of range, punt to the linker to emit an - error. This should only happen with -no-expand. */ - if (val < -(((offsetT) 1 << 27)/2) - || val >= ((offsetT) 1 << 27)/2 - 1 - || (val & 3) != 0) - { - if (warn_on_expansion) - as_warn_where (fixP->fx_file, fixP->fx_line, - _("operand out of range")); - fixP->fx_done = 0; - val = 0; - } - mmix_set_jmp_offset (buf, val); - break; - - case BFD_RELOC_MMIX_REG_OR_BYTE: - if (fixP->fx_addsy != NULL - && (S_GET_SEGMENT (fixP->fx_addsy) != reg_section - || S_GET_VALUE (fixP->fx_addsy) > 255) - && S_GET_SEGMENT (fixP->fx_addsy) != absolute_section) - { - as_bad_where (fixP->fx_file, fixP->fx_line, - _("invalid operands")); - /* We don't want this "symbol" appearing in output, because - that will fail. */ - fixP->fx_done = 1; - } - - buf[0] = val; - - /* If this reloc is for a Z field, we need to adjust - the opcode if we got a constant here. - FIXME: Can we make this more robust? */ - - if ((fixP->fx_where & 3) == 3 - && (fixP->fx_addsy == NULL - || S_GET_SEGMENT (fixP->fx_addsy) == absolute_section)) - buf[-3] |= IMM_OFFSET_BIT; - break; - - case BFD_RELOC_MMIX_REG: - if (fixP->fx_addsy == NULL - || S_GET_SEGMENT (fixP->fx_addsy) != reg_section - || S_GET_VALUE (fixP->fx_addsy) > 255) - { - as_bad_where (fixP->fx_file, fixP->fx_line, - _("invalid operands")); - fixP->fx_done = 1; - } - - *buf = val; - break; - - case BFD_RELOC_MMIX_BASE_PLUS_OFFSET: - /* These are never "fixed". */ - fixP->fx_done = 0; - return; - - case BFD_RELOC_MMIX_PUSHJ_1: - case BFD_RELOC_MMIX_PUSHJ_2: - case BFD_RELOC_MMIX_PUSHJ_3: - case BFD_RELOC_MMIX_CBRANCH_J: - case BFD_RELOC_MMIX_CBRANCH_1: - case BFD_RELOC_MMIX_CBRANCH_2: - case BFD_RELOC_MMIX_CBRANCH_3: - case BFD_RELOC_MMIX_GETA_1: - case BFD_RELOC_MMIX_GETA_2: - case BFD_RELOC_MMIX_GETA_3: - case BFD_RELOC_MMIX_JMP_1: - case BFD_RELOC_MMIX_JMP_2: - case BFD_RELOC_MMIX_JMP_3: - default: - BAD_CASE (fixP->fx_r_type); - break; - } - - if (fixP->fx_done) - /* Make sure that for completed fixups we have the value around for - use by e.g. mmix_frob_file. */ - fixP->fx_offset = val; -} - -/* A bsearch function for looking up a value against offsets for GREG - definitions. */ - -static int -cmp_greg_val_greg_symbol_fixes (const void *p1, const void *p2) -{ - offsetT val1 = *(offsetT *) p1; - offsetT val2 = ((struct mmix_symbol_greg_fixes *) p2)->offs; - - if (val1 >= val2 && val1 < val2 + 255) - return 0; - - if (val1 > val2) - return 1; - - return -1; -} - -/* Generate a machine-dependent relocation. */ - -arelent * -tc_gen_reloc (asection *section ATTRIBUTE_UNUSED, fixS *fixP) -{ - bfd_signed_vma val - = fixP->fx_offset - + (fixP->fx_addsy != NULL - && !S_IS_WEAK (fixP->fx_addsy) - && !S_IS_COMMON (fixP->fx_addsy) - ? S_GET_VALUE (fixP->fx_addsy) : 0); - arelent *relP; - bfd_reloc_code_real_type code = BFD_RELOC_NONE; - char *buf = fixP->fx_where + fixP->fx_frag->fr_literal; - symbolS *addsy = fixP->fx_addsy; - asection *addsec = addsy == NULL ? NULL : S_GET_SEGMENT (addsy); - asymbol *baddsy = addsy != NULL ? symbol_get_bfdsym (addsy) : NULL; - bfd_vma addend - = val - (baddsy == NULL || S_IS_COMMON (addsy) || S_IS_WEAK (addsy) - ? 0 : bfd_asymbol_value (baddsy)); - - /* A single " LOCAL expression" in the wrong section will not work when - linking to MMO; relocations for zero-content sections are then - ignored. Normally, relocations would modify section contents, and - you'd never think or be able to do something like that. The - relocation resulting from a LOCAL directive doesn't have an obvious - and mandatory location. I can't figure out a way to do this better - than just helping the user around this limitation here; hopefully the - code using the local expression is around. Putting the LOCAL - semantics in a relocation still seems right; a section didn't do. */ - if (bfd_section_size (section->owner, section) == 0) - as_bad_where - (fixP->fx_file, fixP->fx_line, - fixP->fx_r_type == BFD_RELOC_MMIX_LOCAL - /* The BFD_RELOC_MMIX_LOCAL-specific message is supposed to be - user-friendly, though a little bit non-substantial. */ - ? _("directive LOCAL must be placed in code or data") - : _("internal confusion: relocation in a section without contents")); - - /* FIXME: Range tests for all these. */ - switch (fixP->fx_r_type) - { - case BFD_RELOC_64: - case BFD_RELOC_32: - case BFD_RELOC_24: - case BFD_RELOC_16: - case BFD_RELOC_8: - code = fixP->fx_r_type; - - if (addsy == NULL || bfd_is_abs_section (addsec)) - { - /* Resolve this reloc now, as md_apply_fix would have done (not - called if -linkrelax). There is no point in keeping a reloc - to an absolute symbol. No reloc that is subject to - relaxation must be to an absolute symbol; difference - involving symbols in a specific section must be signalled as - an error if the relaxing cannot be expressed; having a reloc - to the resolved (now absolute) value does not help. */ - md_number_to_chars (buf, val, fixP->fx_size); - return NULL; - } - break; - - case BFD_RELOC_64_PCREL: - case BFD_RELOC_32_PCREL: - case BFD_RELOC_24_PCREL: - case BFD_RELOC_16_PCREL: - case BFD_RELOC_8_PCREL: - case BFD_RELOC_MMIX_LOCAL: - case BFD_RELOC_VTABLE_INHERIT: - case BFD_RELOC_VTABLE_ENTRY: - case BFD_RELOC_MMIX_GETA: - case BFD_RELOC_MMIX_GETA_1: - case BFD_RELOC_MMIX_GETA_2: - case BFD_RELOC_MMIX_GETA_3: - case BFD_RELOC_MMIX_CBRANCH: - case BFD_RELOC_MMIX_CBRANCH_J: - case BFD_RELOC_MMIX_CBRANCH_1: - case BFD_RELOC_MMIX_CBRANCH_2: - case BFD_RELOC_MMIX_CBRANCH_3: - case BFD_RELOC_MMIX_PUSHJ: - case BFD_RELOC_MMIX_PUSHJ_1: - case BFD_RELOC_MMIX_PUSHJ_2: - case BFD_RELOC_MMIX_PUSHJ_3: - case BFD_RELOC_MMIX_PUSHJ_STUBBABLE: - case BFD_RELOC_MMIX_JMP: - case BFD_RELOC_MMIX_JMP_1: - case BFD_RELOC_MMIX_JMP_2: - case BFD_RELOC_MMIX_JMP_3: - case BFD_RELOC_MMIX_ADDR19: - case BFD_RELOC_MMIX_ADDR27: - code = fixP->fx_r_type; - break; - - case BFD_RELOC_MMIX_REG_OR_BYTE: - /* If we have this kind of relocation to an unknown symbol or to the - register contents section (that is, to a register), then we can't - resolve the relocation here. */ - if (addsy != NULL - && (bfd_is_und_section (addsec) - || strcmp (bfd_get_section_name (addsec->owner, addsec), - MMIX_REG_CONTENTS_SECTION_NAME) == 0)) - { - code = fixP->fx_r_type; - break; - } - - /* If the relocation is not to the register section or to the - absolute section (a numeric value), then we have an error. */ - if (addsy != NULL - && (S_GET_SEGMENT (addsy) != real_reg_section - || val > 255 - || val < 0) - && ! bfd_is_abs_section (addsec)) - goto badop; - - /* Set the "immediate" bit of the insn if this relocation is to Z - field when the value is a numeric value, i.e. not a register. */ - if ((fixP->fx_where & 3) == 3 - && (addsy == NULL || bfd_is_abs_section (addsec))) - buf[-3] |= IMM_OFFSET_BIT; - - buf[0] = val; - return NULL; - - case BFD_RELOC_MMIX_BASE_PLUS_OFFSET: - if (addsy != NULL - && strcmp (bfd_get_section_name (addsec->owner, addsec), - MMIX_REG_CONTENTS_SECTION_NAME) == 0) - { - /* This changed into a register; the relocation is for the - register-contents section. The constant part remains zero. */ - code = BFD_RELOC_MMIX_REG; - break; - } - - /* If we've found out that this was indeed a register, then replace - with the register number. The constant part is already zero. - - If we encounter any other defined symbol, then we must find a - suitable register and emit a reloc. */ - if (addsy == NULL || addsec != real_reg_section) - { - struct mmix_symbol_gregs *gregs; - struct mmix_symbol_greg_fixes *fix; - - if (S_IS_DEFINED (addsy) - && !bfd_is_com_section (addsec) - && !S_IS_WEAK (addsy)) - { - if (! symbol_section_p (addsy) && ! bfd_is_abs_section (addsec)) - as_fatal (_("internal: BFD_RELOC_MMIX_BASE_PLUS_OFFSET not resolved to section")); - - /* If this is an absolute symbol sufficiently near - lowest_data_loc, then we canonicalize on the data - section. Note that val is signed here; we may subtract - lowest_data_loc which is unsigned. Careful with those - comparisons. */ - if (lowest_data_loc != (bfd_vma) -1 - && (bfd_vma) val + 256 > lowest_data_loc - && bfd_is_abs_section (addsec)) - { - val -= (offsetT) lowest_data_loc; - addsy = section_symbol (data_section); - } - /* Likewise text section. */ - else if (lowest_text_loc != (bfd_vma) -1 - && (bfd_vma) val + 256 > lowest_text_loc - && bfd_is_abs_section (addsec)) - { - val -= (offsetT) lowest_text_loc; - addsy = section_symbol (text_section); - } - } - - gregs = *symbol_get_tc (addsy); - - /* If that symbol does not have any associated GREG definitions, - we can't do anything. */ - if (gregs == NULL - || (fix = bsearch (&val, gregs->greg_fixes, gregs->n_gregs, - sizeof (gregs->greg_fixes[0]), - cmp_greg_val_greg_symbol_fixes)) == NULL - /* The register must not point *after* the address we want. */ - || fix->offs > val - /* Neither must the register point more than 255 bytes - before the address we want. */ - || fix->offs + 255 < val) - { - /* We can either let the linker allocate GREGs - automatically, or emit an error. */ - if (allocate_undefined_gregs_in_linker) - { - /* The values in baddsy and addend are right. */ - code = fixP->fx_r_type; - break; - } - else - as_bad_where (fixP->fx_file, fixP->fx_line, - _("no suitable GREG definition for operands")); - return NULL; - } - else - { - /* Transform the base-plus-offset reloc for the actual area - to a reloc for the register with the address of the area. - Put addend for register in Z operand. */ - buf[1] = val - fix->offs; - code = BFD_RELOC_MMIX_REG; - baddsy - = (bfd_get_section_by_name (stdoutput, - MMIX_REG_CONTENTS_SECTION_NAME) - ->symbol); - - addend = fix->fix->fx_frag->fr_address + fix->fix->fx_where; - } - } - else if (S_GET_VALUE (addsy) > 255) - as_bad_where (fixP->fx_file, fixP->fx_line, - _("invalid operands")); - else - { - *buf = val; - return NULL; - } - break; - - case BFD_RELOC_MMIX_REG: - if (addsy != NULL - && (bfd_is_und_section (addsec) - || strcmp (bfd_get_section_name (addsec->owner, addsec), - MMIX_REG_CONTENTS_SECTION_NAME) == 0)) - { - code = fixP->fx_r_type; - break; - } - - if (addsy != NULL - && (addsec != real_reg_section - || val > 255 - || val < 0) - && ! bfd_is_und_section (addsec)) - /* Drop through to error message. */ - ; - else - { - buf[0] = val; - return NULL; - } - /* FALLTHROUGH. */ - - /* The others are supposed to be handled by md_apply_fix. - FIXME: ... which isn't called when -linkrelax. Move over - md_apply_fix code here for everything reasonable. */ - badop: - default: - as_bad_where - (fixP->fx_file, fixP->fx_line, - _("operands were not reducible at assembly-time")); - - /* Unmark this symbol as used in a reloc, so we don't bump into a BFD - assert when trying to output reg_section. FIXME: A gas bug. */ - fixP->fx_addsy = NULL; - return NULL; - } - - relP = (arelent *) xmalloc (sizeof (arelent)); - assert (relP != 0); - relP->sym_ptr_ptr = (asymbol **) xmalloc (sizeof (asymbol *)); - *relP->sym_ptr_ptr = baddsy; - relP->address = fixP->fx_frag->fr_address + fixP->fx_where; - - relP->addend = addend; - - /* If this had been a.out, we would have had a kludge for weak symbols - here. */ - - relP->howto = bfd_reloc_type_lookup (stdoutput, code); - if (! relP->howto) - { - const char *name; - - name = S_GET_NAME (addsy); - if (name == NULL) - name = _("<unknown>"); - as_fatal (_("cannot generate relocation type for symbol %s, code %s"), - name, bfd_get_reloc_code_name (code)); - } - - return relP; -} - -/* Do some reformatting of a line. FIXME: We could transform a mmixal - line into traditional (GNU?) format, unless #NO_APP, and get rid of all - ugly labels_without_colons etc. */ - -void -mmix_handle_mmixal (void) -{ - char *insn; - char *s = input_line_pointer; - char *label = NULL; - char c; - - if (pending_label != NULL) - as_fatal (_("internal: unhandled label %s"), pending_label); - - if (mmix_gnu_syntax) - return; - - /* If we're on a line with a label, check if it's a mmixal fb-label. - Save an indicator and skip the label; it must be set only after all - fb-labels of expressions are evaluated. */ - if (ISDIGIT (s[0]) && s[1] == 'H' && ISSPACE (s[2])) - { - current_fb_label = s[0] - '0'; - - /* We have to skip the label, but also preserve the newlineness of - the previous character, since the caller checks that. It's a - mess we blame on the caller. */ - s[1] = s[-1]; - s += 2; - input_line_pointer = s; - - while (*s && ISSPACE (*s) && ! is_end_of_line[(unsigned int) *s]) - s++; - - /* For errors emitted here, the book-keeping is off by one; the - caller is about to bump the counters. Adjust the error messages. */ - if (is_end_of_line[(unsigned int) *s]) - { - char *name; - unsigned int line; - as_where (&name, &line); - as_bad_where (name, line + 1, - _("[0-9]H labels may not appear alone on a line")); - current_fb_label = -1; - } - if (*s == '.') - { - char *name; - unsigned int line; - as_where (&name, &line); - as_bad_where (name, line + 1, - _("[0-9]H labels do not mix with dot-pseudos")); - current_fb_label = -1; - } - - /* Back off to the last space before the opcode so we don't handle - the opcode as a label. */ - s--; - } - else - current_fb_label = -1; - - if (*s == '.') - { - /* If the first character is a '.', then it's a pseudodirective, not a - label. Make GAS not handle label-without-colon on this line. We - also don't do mmixal-specific stuff on this line. */ - label_without_colon_this_line = 0; - return; - } - - if (*s == 0 || is_end_of_line[(unsigned int) *s]) - /* We avoid handling empty lines here. */ - return; - - if (is_name_beginner (*s)) - label = s; - - /* If there is a label, skip over it. */ - while (*s && is_part_of_name (*s)) - s++; - - /* Find the start of the instruction or pseudo following the label, - if there is one. */ - for (insn = s; - *insn && ISSPACE (*insn) && ! is_end_of_line[(unsigned int) *insn]; - insn++) - /* Empty */ - ; - - /* Remove a trailing ":" off labels, as they'd otherwise be considered - part of the name. But don't do this for local labels. */ - if (s != input_line_pointer && s[-1] == ':' - && (s - 2 != input_line_pointer - || ! ISDIGIT (s[-2]))) - s[-1] = ' '; - else if (label != NULL - /* For a lone label on a line, we don't attach it to the next - instruction or MMIXAL-pseudo (getting its alignment). Thus - is acts like a "normal" :-ended label. Ditto if it's - followed by a non-MMIXAL pseudo. */ - && !is_end_of_line[(unsigned int) *insn] - && *insn != '.') - { - /* For labels that don't end in ":", we save it so we can later give - it the same alignment and address as the associated instruction. */ - - /* Make room for the label including the ending nul. */ - int len_0 = s - label + 1; - - /* Save this label on the MMIX symbol obstack. Saving it on an - obstack is needless for "IS"-pseudos, but it's harmless and we - avoid a little code-cluttering. */ - obstack_grow (&mmix_sym_obstack, label, len_0); - pending_label = obstack_finish (&mmix_sym_obstack); - pending_label[len_0 - 1] = 0; - } - - /* If we have a non-MMIXAL pseudo, we have not business with the rest of - the line. */ - if (*insn == '.') - return; - - /* Find local labels of operands. Look for "[0-9][FB]" where the - characters before and after are not part of words. Break if a single - or double quote is seen anywhere. It means we can't have local - labels as part of list with mixed quoted and unquoted members for - mmixal compatibility but we can't have it all. For the moment. - Replace the '<N>B' or '<N>F' with MAGIC_FB_BACKWARD_CHAR<N> and - MAGIC_FB_FORWARD_CHAR<N> respectively. */ - - /* First make sure we don't have any of the magic characters on the line - appearing as input. */ - while (*s) - { - c = *s++; - if (is_end_of_line[(unsigned int) c]) - break; - if (c == MAGIC_FB_BACKWARD_CHAR || c == MAGIC_FB_FORWARD_CHAR) - as_bad (_("invalid characters in input")); - } - - /* Scan again, this time looking for ';' after operands. */ - s = insn; - - /* Skip the insn. */ - while (*s - && ! ISSPACE (*s) - && *s != ';' - && ! is_end_of_line[(unsigned int) *s]) - s++; - - /* Skip the spaces after the insn. */ - while (*s - && ISSPACE (*s) - && *s != ';' - && ! is_end_of_line[(unsigned int) *s]) - s++; - - /* Skip the operands. While doing this, replace [0-9][BF] with - (MAGIC_FB_BACKWARD_CHAR|MAGIC_FB_FORWARD_CHAR)[0-9]. */ - while ((c = *s) != 0 - && ! ISSPACE (c) - && c != ';' - && ! is_end_of_line[(unsigned int) c]) - { - if (c == '"') - { - s++; - - /* FIXME: Test-case for semi-colon in string. */ - while (*s - && *s != '"' - && (! is_end_of_line[(unsigned int) *s] || *s == ';')) - s++; - - if (*s == '"') - s++; - } - else if (ISDIGIT (c)) - { - if ((s[1] != 'B' && s[1] != 'F') - || is_part_of_name (s[-1]) - || is_part_of_name (s[2]) - /* Don't treat e.g. #1F as a local-label reference. */ - || (s != input_line_pointer && s[-1] == '#')) - s++; - else - { - s[0] = (s[1] == 'B' - ? MAGIC_FB_BACKWARD_CHAR : MAGIC_FB_FORWARD_CHAR); - s[1] = c; - } - } - else - s++; - } - - /* Skip any spaces after the operands. */ - while (*s - && ISSPACE (*s) - && *s != ';' - && !is_end_of_line[(unsigned int) *s]) - s++; - - /* If we're now looking at a semi-colon, then it's an end-of-line - delimiter. */ - mmix_next_semicolon_is_eoln = (*s == ';'); - - /* Make IS into an EQU by replacing it with "= ". Only match upper-case - though; let lower-case be a syntax error. */ - s = insn; - if (s[0] == 'I' && s[1] == 'S' && ISSPACE (s[2])) - { - *s = '='; - s[1] = ' '; - - /* Since labels can start without ":", we have to handle "X IS 42" - in full here, or "X" will be parsed as a label to be set at ".". */ - input_line_pointer = s; - - /* Right after this function ends, line numbers will be bumped if - input_line_pointer[-1] = '\n'. We want accurate line numbers for - the equals call, so we bump them before the call, and make sure - they aren't bumped afterwards. */ - bump_line_counters (); - - /* A fb-label is valid as an IS-label. */ - if (current_fb_label >= 0) - { - char *fb_name; - - /* We need to save this name on our symbol obstack, since the - string we got in fb_label_name is volatile and will change - with every call to fb_label_name, like those resulting from - parsing the IS-operand. */ - fb_name = fb_label_name (current_fb_label, 1); - obstack_grow (&mmix_sym_obstack, fb_name, strlen (fb_name) + 1); - equals (obstack_finish (&mmix_sym_obstack), 0); - fb_label_instance_inc (current_fb_label); - current_fb_label = -1; - } - else - { - if (pending_label == NULL) - as_bad (_("empty label field for IS")); - else - equals (pending_label, 0); - pending_label = NULL; - } - - /* For mmixal, we can have comments without a comment-start - character. */ - mmix_handle_rest_of_empty_line (); - input_line_pointer--; - - input_line_pointer[-1] = ' '; - } - else if (s[0] == 'G' - && s[1] == 'R' - && strncmp (s, "GREG", 4) == 0 - && (ISSPACE (s[4]) || is_end_of_line[(unsigned char) s[4]])) - { - input_line_pointer = s + 4; - - /* Right after this function ends, line numbers will be bumped if - input_line_pointer[-1] = '\n'. We want accurate line numbers for - the s_greg call, so we bump them before the call, and make sure - they aren't bumped afterwards. */ - bump_line_counters (); - - /* A fb-label is valid as a GREG-label. */ - if (current_fb_label >= 0) - { - char *fb_name; - - /* We need to save this name on our symbol obstack, since the - string we got in fb_label_name is volatile and will change - with every call to fb_label_name, like those resulting from - parsing the IS-operand. */ - fb_name = fb_label_name (current_fb_label, 1); - - /* Make sure we save the canonical name and don't get bitten by - prefixes. */ - obstack_1grow (&mmix_sym_obstack, ':'); - obstack_grow (&mmix_sym_obstack, fb_name, strlen (fb_name) + 1); - mmix_greg_internal (obstack_finish (&mmix_sym_obstack)); - fb_label_instance_inc (current_fb_label); - current_fb_label = -1; - } - else - mmix_greg_internal (pending_label); - - /* Back up before the end-of-line marker that was skipped in - mmix_greg_internal. */ - input_line_pointer--; - input_line_pointer[-1] = ' '; - - pending_label = NULL; - } - else if (pending_label != NULL) - { - input_line_pointer += strlen (pending_label); - - /* See comment above about getting line numbers bumped. */ - input_line_pointer[-1] = '\n'; - } -} - -/* Give the value of an fb-label rewritten as in mmix_handle_mmixal, when - parsing an expression. - - On valid calls, input_line_pointer points at a MAGIC_FB_BACKWARD_CHAR - or MAGIC_FB_BACKWARD_CHAR, followed by an ascii digit for the label. - We fill in the label as an expression. */ - -void -mmix_fb_label (expressionS *expP) -{ - symbolS *sym; - char *fb_internal_name; - - /* This doesn't happen when not using mmixal syntax. */ - if (mmix_gnu_syntax - || (input_line_pointer[0] != MAGIC_FB_BACKWARD_CHAR - && input_line_pointer[0] != MAGIC_FB_FORWARD_CHAR)) - return; - - /* The current backward reference has augmentation 0. A forward - reference has augmentation 1, unless it's the same as a fb-label on - _this_ line, in which case we add one more so we don't refer to it. - This is the semantics of mmixal; it differs to that of common - fb-labels which refer to a here-label on the current line as a - backward reference. */ - fb_internal_name - = fb_label_name (input_line_pointer[1] - '0', - (input_line_pointer[0] == MAGIC_FB_FORWARD_CHAR ? 1 : 0) - + ((input_line_pointer[1] - '0' == current_fb_label - && input_line_pointer[0] == MAGIC_FB_FORWARD_CHAR) - ? 1 : 0)); - - input_line_pointer += 2; - sym = symbol_find_or_make (fb_internal_name); - - /* We don't have to clean up unrelated fields here; we just do what the - expr machinery does, but *not* just what it does for [0-9][fb], since - we need to treat those as ordinary symbols sometimes; see testcases - err-byte2.s and fb-2.s. */ - if (S_GET_SEGMENT (sym) == absolute_section) - { - expP->X_op = O_constant; - expP->X_add_number = S_GET_VALUE (sym); - } - else - { - expP->X_op = O_symbol; - expP->X_add_symbol = sym; - expP->X_add_number = 0; - } -} - -/* See whether we need to force a relocation into the output file. - This is used to force out switch and PC relative relocations when - relaxing. */ - -int -mmix_force_relocation (fixS *fixP) -{ - if (fixP->fx_r_type == BFD_RELOC_MMIX_LOCAL - || fixP->fx_r_type == BFD_RELOC_MMIX_BASE_PLUS_OFFSET) - return 1; - - if (linkrelax) - return 1; - - /* All our pcrel relocations are must-keep. Note that md_apply_fix is - called *after* this, and will handle getting rid of the presumed - reloc; a relocation isn't *forced* other than to be handled by - md_apply_fix (or tc_gen_reloc if linkrelax). */ - if (fixP->fx_pcrel) - return 1; - - return generic_force_reloc (fixP); -} - -/* The location from which a PC relative jump should be calculated, - given a PC relative reloc. */ - -long -md_pcrel_from_section (fixS *fixP, segT sec) -{ - if (fixP->fx_addsy != (symbolS *) NULL - && (! S_IS_DEFINED (fixP->fx_addsy) - || S_GET_SEGMENT (fixP->fx_addsy) != sec)) - { - /* The symbol is undefined (or is defined but not in this section). - Let the linker figure it out. */ - return 0; - } - - return (fixP->fx_frag->fr_address + fixP->fx_where); -} - -/* Adjust the symbol table. We make reg_section relative to the real - register section. */ - -void -mmix_adjust_symtab (void) -{ - symbolS *sym; - symbolS *regsec = section_symbol (reg_section); - - for (sym = symbol_rootP; sym != NULL; sym = symbol_next (sym)) - if (S_GET_SEGMENT (sym) == reg_section) - { - if (sym == regsec) - { - if (S_IS_EXTERNAL (sym) || symbol_used_in_reloc_p (sym)) - abort (); - symbol_remove (sym, &symbol_rootP, &symbol_lastP); - } - else - /* Change section to the *real* register section, so it gets - proper treatment when writing it out. Only do this for - global symbols. This also means we don't have to check for - $0..$255. */ - S_SET_SEGMENT (sym, real_reg_section); - } -} - -/* This is the expansion of LABELS_WITHOUT_COLONS. - We let md_start_line_hook tweak label_without_colon_this_line, and then - this function returns the tweaked value, and sets it to 1 for the next - line. FIXME: Very, very brittle. Not sure it works the way I - thought at the time I first wrote this. */ - -int -mmix_label_without_colon_this_line (void) -{ - int retval = label_without_colon_this_line; - - if (! mmix_gnu_syntax) - label_without_colon_this_line = 1; - - return retval; -} - -/* This is the expansion of md_relax_frag. We go through the ordinary - relax table function except when the frag is for a GREG. Then we have - to check whether there's another GREG by the same value that we can - join with. */ - -long -mmix_md_relax_frag (segT seg, fragS *fragP, long stretch) -{ - switch (fragP->fr_subtype) - { - /* Growth for this type has been handled by mmix_md_end and - correctly estimated, so there's nothing more to do here. */ - case STATE_GREG_DEF: - return 0; - - case ENCODE_RELAX (STATE_PUSHJ, STATE_ZERO): - { - /* We need to handle relaxation type ourselves, since relax_frag - doesn't update fr_subtype if there's no size increase in the - current section; when going from plain PUSHJ to a stub. This - is otherwise functionally the same as relax_frag in write.c, - simplified for this case. */ - offsetT aim; - addressT target; - addressT address; - symbolS *symbolP; - target = fragP->fr_offset; - address = fragP->fr_address; - symbolP = fragP->fr_symbol; - - if (symbolP) - { - fragS *sym_frag; - - sym_frag = symbol_get_frag (symbolP); - know (S_GET_SEGMENT (symbolP) != absolute_section - || sym_frag == &zero_address_frag); - target += S_GET_VALUE (symbolP); - - /* If frag has yet to be reached on this pass, assume it will - move by STRETCH just as we did. If this is not so, it will - be because some frag between grows, and that will force - another pass. */ - - if (stretch != 0 - && sym_frag->relax_marker != fragP->relax_marker - && S_GET_SEGMENT (symbolP) == seg) - target += stretch; - } - - aim = target - address - fragP->fr_fix; - if (aim >= PUSHJ_0B && aim <= PUSHJ_0F) - { - /* Target is reachable with a PUSHJ. */ - segment_info_type *seginfo = seg_info (seg); - - /* If we're at the end of a relaxation round, clear the stub - counter as initialization for the next round. */ - if (fragP == seginfo->tc_segment_info_data.last_stubfrag) - seginfo->tc_segment_info_data.nstubs = 0; - return 0; - } - - /* Not reachable. Try a stub. */ - fragP->fr_subtype = ENCODE_RELAX (STATE_PUSHJSTUB, STATE_ZERO); - } - /* FALLTHROUGH. */ - - /* See if this PUSHJ is redirectable to a stub. */ - case ENCODE_RELAX (STATE_PUSHJSTUB, STATE_ZERO): - { - segment_info_type *seginfo = seg_info (seg); - fragS *lastfrag = seginfo->frchainP->frch_last; - relax_substateT prev_type = fragP->fr_subtype; - - /* The last frag is always an empty frag, so it suffices to look - at its address to know the ending address of this section. */ - know (lastfrag->fr_type == rs_fill - && lastfrag->fr_fix == 0 - && lastfrag->fr_var == 0); - - /* For this PUSHJ to be relaxable into a call to a stub, the - distance must be no longer than 256k bytes from the PUSHJ to - the end of the section plus the maximum size of stubs so far. */ - if ((lastfrag->fr_address - + stretch - + PUSHJ_MAX_LEN * seginfo->tc_segment_info_data.nstubs) - - (fragP->fr_address + fragP->fr_fix) - > GETA_0F - || !pushj_stubs) - fragP->fr_subtype = mmix_relax_table[prev_type].rlx_more; - else - seginfo->tc_segment_info_data.nstubs++; - - /* If we're at the end of a relaxation round, clear the stub - counter as initialization for the next round. */ - if (fragP == seginfo->tc_segment_info_data.last_stubfrag) - seginfo->tc_segment_info_data.nstubs = 0; - - return - (mmix_relax_table[fragP->fr_subtype].rlx_length - - mmix_relax_table[prev_type].rlx_length); - } - - case ENCODE_RELAX (STATE_PUSHJ, STATE_MAX): - { - segment_info_type *seginfo = seg_info (seg); - - /* Need to cover all STATE_PUSHJ states to act on the last stub - frag (the end of this relax round; initialization for the - next). */ - if (fragP == seginfo->tc_segment_info_data.last_stubfrag) - seginfo->tc_segment_info_data.nstubs = 0; - - return 0; - } - - default: - return relax_frag (seg, fragP, stretch); - - case STATE_GREG_UNDF: - BAD_CASE (fragP->fr_subtype); - } - - as_fatal (_("internal: unexpected relax type %d:%d"), - fragP->fr_type, fragP->fr_subtype); - return 0; -} - -/* Various things we punt until all input is seen. */ - -void -mmix_md_end (void) -{ - fragS *fragP; - symbolS *mainsym; - int i; - - /* The first frag of GREG:s going into the register contents section. */ - fragS *mmix_reg_contents_frags = NULL; - - /* Reset prefix. All labels reachable at this point must be - canonicalized. */ - mmix_current_prefix = NULL; - - if (doing_bspec) - as_bad_where (bspec_file, bspec_line, _("BSPEC without ESPEC.")); - - /* Emit the low LOC setting of .text. */ - if (text_has_contents && lowest_text_loc != (bfd_vma) -1) - { - symbolS *symbolP; - char locsymbol[sizeof (":") - 1 - + sizeof (MMIX_LOC_SECTION_START_SYMBOL_PREFIX) - 1 - + sizeof (".text")]; - - /* An exercise in non-ISO-C-ness, this one. */ - sprintf (locsymbol, ":%s%s", MMIX_LOC_SECTION_START_SYMBOL_PREFIX, - ".text"); - symbolP - = symbol_new (locsymbol, absolute_section, lowest_text_loc, - &zero_address_frag); - S_SET_EXTERNAL (symbolP); - } - - /* Ditto .data. */ - if (data_has_contents && lowest_data_loc != (bfd_vma) -1) - { - symbolS *symbolP; - char locsymbol[sizeof (":") - 1 - + sizeof (MMIX_LOC_SECTION_START_SYMBOL_PREFIX) - 1 - + sizeof (".data")]; - - sprintf (locsymbol, ":%s%s", MMIX_LOC_SECTION_START_SYMBOL_PREFIX, - ".data"); - symbolP - = symbol_new (locsymbol, absolute_section, lowest_data_loc, - &zero_address_frag); - S_SET_EXTERNAL (symbolP); - } - - /* Unless GNU syntax mode, set "Main" to be a function, so the - disassembler doesn't get confused when we write truly - mmixal-compatible code (and don't use .type). Similarly set it - global (regardless of -globalize-symbols), so the linker sees it as - the start symbol in ELF mode. */ - mainsym = symbol_find (MMIX_START_SYMBOL_NAME); - if (mainsym != NULL && ! mmix_gnu_syntax) - { - symbol_get_bfdsym (mainsym)->flags |= BSF_FUNCTION; - S_SET_EXTERNAL (mainsym); - } - - if (n_of_raw_gregs != 0) - { - /* Emit GREGs. They are collected in order of appearance, but must - be emitted in opposite order to both have section address regno*8 - and the same allocation order (within a file) as mmixal. */ - segT this_segment = now_seg; - subsegT this_subsegment = now_subseg; - asection *regsec - = bfd_make_section_old_way (stdoutput, - MMIX_REG_CONTENTS_SECTION_NAME); - subseg_set (regsec, 0); - - /* Finally emit the initialization-value. Emit a variable frag, which - we'll fix in md_estimate_size_before_relax. We set the initializer - for the tc_frag_data field to NULL, so we can use that field for - relaxation purposes. */ - mmix_opcode_frag = NULL; - - frag_grow (0); - mmix_reg_contents_frags = frag_now; - - for (i = n_of_raw_gregs - 1; i >= 0; i--) - { - if (mmix_raw_gregs[i].label != NULL) - /* There's a symbol. Let it refer to this location in the - register contents section. The symbol must be globalized - separately. */ - colon (mmix_raw_gregs[i].label); - - frag_var (rs_machine_dependent, 8, 0, STATE_GREG_UNDF, - make_expr_symbol (&mmix_raw_gregs[i].exp), 0, NULL); - } - - subseg_set (this_segment, this_subsegment); - } - - /* Iterate over frags resulting from GREGs and move those that evidently - have the same value together and point one to another. - - This works in time O(N^2) but since the upper bound for non-error use - is 223, it's best to keep this simpler algorithm. */ - for (fragP = mmix_reg_contents_frags; fragP != NULL; fragP = fragP->fr_next) - { - fragS **fpp; - fragS *fp = NULL; - fragS *osymfrag; - offsetT osymval; - expressionS *oexpP; - symbolS *symbolP = fragP->fr_symbol; - - if (fragP->fr_type != rs_machine_dependent - || fragP->fr_subtype != STATE_GREG_UNDF) - continue; - - /* Whatever the outcome, we will have this GREG judged merged or - non-merged. Since the tc_frag_data is NULL at this point, we - default to non-merged. */ - fragP->fr_subtype = STATE_GREG_DEF; - - /* If we're not supposed to merge GREG definitions, then just don't - look for equivalents. */ - if (! merge_gregs) - continue; - - osymval = (offsetT) S_GET_VALUE (symbolP); - osymfrag = symbol_get_frag (symbolP); - - /* If the symbol isn't defined, we can't say that another symbol - equals this frag, then. FIXME: We can look at the "deepest" - defined name; if a = c and b = c then obviously a == b. */ - if (! S_IS_DEFINED (symbolP)) - continue; - - oexpP = symbol_get_value_expression (fragP->fr_symbol); - - /* If the initialization value is zero, then we must not merge them. */ - if (oexpP->X_op == O_constant && osymval == 0) - continue; - - /* Iterate through the frags downward this one. If we find one that - has the same non-zero value, move it to after this one and point - to it as the equivalent. */ - for (fpp = &fragP->fr_next; *fpp != NULL; fpp = &fpp[0]->fr_next) - { - fp = *fpp; - - if (fp->fr_type != rs_machine_dependent - || fp->fr_subtype != STATE_GREG_UNDF) - continue; - - /* Calling S_GET_VALUE may simplify the symbol, changing from - expr_section etc. so call it first. */ - if ((offsetT) S_GET_VALUE (fp->fr_symbol) == osymval - && symbol_get_frag (fp->fr_symbol) == osymfrag) - { - /* Move the frag links so the one we found equivalent comes - after the current one, carefully considering that - sometimes fpp == &fragP->fr_next and the moves must be a - NOP then. */ - *fpp = fp->fr_next; - fp->fr_next = fragP->fr_next; - fragP->fr_next = fp; - break; - } - } - - if (*fpp != NULL) - fragP->tc_frag_data = fp; - } -} - -/* qsort function for mmix_symbol_gregs. */ - -static int -cmp_greg_symbol_fixes (const void *parg, const void *qarg) -{ - const struct mmix_symbol_greg_fixes *p - = (const struct mmix_symbol_greg_fixes *) parg; - const struct mmix_symbol_greg_fixes *q - = (const struct mmix_symbol_greg_fixes *) qarg; - - return p->offs > q->offs ? 1 : p->offs < q->offs ? -1 : 0; -} - -/* Collect GREG definitions from mmix_gregs and hang them as lists sorted - on increasing offsets onto each section symbol or undefined symbol. - - Also, remove the register convenience section so it doesn't get output - as an ELF section. */ - -void -mmix_frob_file (void) -{ - int i; - struct mmix_symbol_gregs *all_greg_symbols[MAX_GREGS]; - int n_greg_symbols = 0; - - /* Collect all greg fixups and decorate each corresponding symbol with - the greg fixups for it. */ - for (i = 0; i < n_of_cooked_gregs; i++) - { - offsetT offs; - symbolS *sym; - struct mmix_symbol_gregs *gregs; - fixS *fixP; - - fixP = mmix_gregs[i]; - know (fixP->fx_r_type == BFD_RELOC_64); - - /* This case isn't doable in general anyway, methinks. */ - if (fixP->fx_subsy != NULL) - { - as_bad_where (fixP->fx_file, fixP->fx_line, - _("GREG expression too complicated")); - continue; - } - - sym = fixP->fx_addsy; - offs = (offsetT) fixP->fx_offset; - - /* If the symbol is defined, then it must be resolved to a section - symbol at this time, or else we don't know how to handle it. */ - if (S_IS_DEFINED (sym) - && !bfd_is_com_section (S_GET_SEGMENT (sym)) - && !S_IS_WEAK (sym)) - { - if (! symbol_section_p (sym) - && ! bfd_is_abs_section (S_GET_SEGMENT (sym))) - as_fatal (_("internal: GREG expression not resolved to section")); - - offs += S_GET_VALUE (sym); - } - - /* If this is an absolute symbol sufficiently near lowest_data_loc, - then we canonicalize on the data section. Note that offs is - signed here; we may subtract lowest_data_loc which is unsigned. - Careful with those comparisons. */ - if (lowest_data_loc != (bfd_vma) -1 - && (bfd_vma) offs + 256 > lowest_data_loc - && bfd_is_abs_section (S_GET_SEGMENT (sym))) - { - offs -= (offsetT) lowest_data_loc; - sym = section_symbol (data_section); - } - /* Likewise text section. */ - else if (lowest_text_loc != (bfd_vma) -1 - && (bfd_vma) offs + 256 > lowest_text_loc - && bfd_is_abs_section (S_GET_SEGMENT (sym))) - { - offs -= (offsetT) lowest_text_loc; - sym = section_symbol (text_section); - } - - gregs = *symbol_get_tc (sym); - - if (gregs == NULL) - { - gregs = xmalloc (sizeof (*gregs)); - gregs->n_gregs = 0; - symbol_set_tc (sym, &gregs); - all_greg_symbols[n_greg_symbols++] = gregs; - } - - gregs->greg_fixes[gregs->n_gregs].fix = fixP; - gregs->greg_fixes[gregs->n_gregs++].offs = offs; - } - - /* For each symbol having a GREG definition, sort those definitions on - offset. */ - for (i = 0; i < n_greg_symbols; i++) - qsort (all_greg_symbols[i]->greg_fixes, all_greg_symbols[i]->n_gregs, - sizeof (all_greg_symbols[i]->greg_fixes[0]), cmp_greg_symbol_fixes); - - if (real_reg_section != NULL) - { - /* FIXME: Pass error state gracefully. */ - if (bfd_get_section_flags (stdoutput, real_reg_section) & SEC_HAS_CONTENTS) - as_fatal (_("register section has contents\n")); - - bfd_section_list_remove (stdoutput, real_reg_section); - --stdoutput->section_count; - } - -} - -/* Provide an expression for a built-in name provided when-used. - Either a symbol that is a handler; living in 0x10*[1..8] and having - name [DVWIOUZX]_Handler, or a mmixal built-in symbol. - - If the name isn't a built-in name and parsed into *EXPP, return zero. */ - -int -mmix_parse_predefined_name (char *name, expressionS *expP) -{ - char *canon_name; - char *handler_charp; - const char handler_chars[] = "DVWIOUZX"; - symbolS *symp; - - if (! predefined_syms) - return 0; - - canon_name = tc_canonicalize_symbol_name (name); - - if (canon_name[1] == '_' - && strcmp (canon_name + 2, "Handler") == 0 - && (handler_charp = strchr (handler_chars, *canon_name)) != NULL) - { - /* If the symbol doesn't exist, provide one relative to the .text - section. - - FIXME: We should provide separate sections, mapped in the linker - script. */ - symp = symbol_find (name); - if (symp == NULL) - symp = symbol_new (name, text_section, - 0x10 * (handler_charp + 1 - handler_chars), - &zero_address_frag); - } - else - { - /* These symbols appear when referenced; needed for - mmixal-compatible programs. */ - unsigned int i; - - static const struct - { - const char *name; - valueT val; - } predefined_abs_syms[] = - { - {"Data_Segment", (valueT) 0x20 << 56}, - {"Pool_Segment", (valueT) 0x40 << 56}, - {"Stack_Segment", (valueT) 0x60 << 56}, - {"StdIn", 0}, - {"StdOut", 1}, - {"StdErr", 2}, - {"TextRead", 0}, - {"TextWrite", 1}, - {"BinaryRead", 2}, - {"BinaryWrite", 3}, - {"BinaryReadWrite", 4}, - {"Halt", 0}, - {"Fopen", 1}, - {"Fclose", 2}, - {"Fread", 3}, - {"Fgets", 4}, - {"Fgetws", 5}, - {"Fwrite", 6}, - {"Fputs", 7}, - {"Fputws", 8}, - {"Fseek", 9}, - {"Ftell", 10}, - {"D_BIT", 0x80}, - {"V_BIT", 0x40}, - {"W_BIT", 0x20}, - {"I_BIT", 0x10}, - {"O_BIT", 0x08}, - {"U_BIT", 0x04}, - {"Z_BIT", 0x02}, - {"X_BIT", 0x01}, - {"Inf", 0x7ff00000} - }; - - /* If it's already in the symbol table, we shouldn't do anything. */ - symp = symbol_find (name); - if (symp != NULL) - return 0; - - for (i = 0; - i < sizeof (predefined_abs_syms) / sizeof (predefined_abs_syms[0]); - i++) - if (strcmp (canon_name, predefined_abs_syms[i].name) == 0) - { - symbol_table_insert (symbol_new (predefined_abs_syms[i].name, - absolute_section, - predefined_abs_syms[i].val, - &zero_address_frag)); - - /* Let gas find the symbol we just created, through its - ordinary lookup. */ - return 0; - } - - /* Not one of those symbols. Let gas handle it. */ - return 0; - } - - expP->X_op = O_symbol; - expP->X_add_number = 0; - expP->X_add_symbol = symp; - expP->X_op_symbol = NULL; - - return 1; -} - -/* Just check that we don't have a BSPEC/ESPEC pair active when changing - sections "normally", and get knowledge about alignment from the new - section. */ - -void -mmix_md_elf_section_change_hook (void) -{ - if (doing_bspec) - as_bad (_("section change from within a BSPEC/ESPEC pair is not supported")); - - last_alignment = bfd_get_section_alignment (now_seg->owner, now_seg); - want_unaligned = 0; -} - -/* The LOC worker. This is like s_org, but we have to support changing - section too. */ - -static void -s_loc (int ignore ATTRIBUTE_UNUSED) -{ - segT section; - expressionS exp; - char *p; - symbolS *sym; - offsetT off; - - /* Must not have a BSPEC in progress. */ - if (doing_bspec) - { - as_bad (_("directive LOC from within a BSPEC/ESPEC pair is not supported")); - return; - } - - section = expression (&exp); - - if (exp.X_op == O_illegal - || exp.X_op == O_absent - || exp.X_op == O_big - || section == undefined_section) - { - as_bad (_("invalid LOC expression")); - return; - } - - if (section == absolute_section) - { - /* Translate a constant into a suitable section. */ - - if (exp.X_add_number < ((offsetT) 0x20 << 56)) - { - /* Lower than Data_Segment - assume it's .text. */ - section = text_section; - - /* Save the lowest seen location, so we can pass on this - information to the linker. We don't actually org to this - location here, we just pass on information to the linker so - it can put the code there for us. */ - - /* If there was already a loc (that has to be set lower than - this one), we org at (this - lower). There's an implicit - "LOC 0" before any entered code. FIXME: handled by spurious - settings of text_has_contents. */ - if (exp.X_add_number < 0 - || exp.X_add_number < (offsetT) lowest_text_loc) - { - as_bad (_("LOC expression stepping backwards is not supported")); - exp.X_op = O_absent; - } - else - { - if (text_has_contents && lowest_text_loc == (bfd_vma) -1) - lowest_text_loc = 0; - - if (lowest_text_loc == (bfd_vma) -1) - { - lowest_text_loc = exp.X_add_number; - - /* We want only to change the section, not set an offset. */ - exp.X_op = O_absent; - } - else - exp.X_add_number -= lowest_text_loc; - } - } - else - { - /* Do the same for the .data section. */ - section = data_section; - - if (exp.X_add_number < (offsetT) lowest_data_loc) - { - as_bad (_("LOC expression stepping backwards is not supported")); - exp.X_op = O_absent; - } - else - { - if (data_has_contents && lowest_data_loc == (bfd_vma) -1) - lowest_data_loc = (bfd_vma) 0x20 << 56; - - if (lowest_data_loc == (bfd_vma) -1) - { - lowest_data_loc = exp.X_add_number; - - /* We want only to change the section, not set an offset. */ - exp.X_op = O_absent; - } - else - exp.X_add_number -= lowest_data_loc; - } - } - } - - if (section != now_seg) - { - obj_elf_section_change_hook (); - subseg_set (section, 0); - - /* Call our section change hooks using the official hook. */ - md_elf_section_change_hook (); - } - - if (exp.X_op != O_absent) - { - if (exp.X_op != O_constant && exp.X_op != O_symbol) - { - /* Handle complex expressions. */ - sym = make_expr_symbol (&exp); - off = 0; - } - else - { - sym = exp.X_add_symbol; - off = exp.X_add_number; - } - - p = frag_var (rs_org, 1, 1, (relax_substateT) 0, sym, off, (char *) 0); - *p = 0; - } - - mmix_handle_rest_of_empty_line (); -} - -/* The BYTE worker. We have to support sequences of mixed "strings", - numbers and other constant "first-pass" reducible expressions separated - by comma. */ - -static void -mmix_byte (void) -{ - unsigned int c; - char *start; - - if (now_seg == text_section) - text_has_contents = 1; - else if (now_seg == data_section) - data_has_contents = 1; - - do - { - SKIP_WHITESPACE (); - switch (*input_line_pointer) - { - case '\"': - ++input_line_pointer; - start = input_line_pointer; - while (is_a_char (c = next_char_of_string ())) - { - FRAG_APPEND_1_CHAR (c); - } - - if (input_line_pointer[-1] != '\"') - { - /* We will only get here in rare cases involving #NO_APP, - where the unterminated string is not recognized by the - preformatting pass. */ - as_bad (_("unterminated string")); - mmix_discard_rest_of_line (); - return; - } - break; - - default: - { - expressionS exp; - segT expseg = expression (&exp); - - /* We have to allow special register names as constant numbers. */ - if ((expseg != absolute_section && expseg != reg_section) - || (exp.X_op != O_constant - && (exp.X_op != O_register - || exp.X_add_number <= 255))) - { - as_bad (_("BYTE expression not a pure number")); - mmix_discard_rest_of_line (); - return; - } - else if ((exp.X_add_number > 255 && exp.X_op != O_register) - || exp.X_add_number < 0) - { - /* Note that mmixal does not allow negative numbers in - BYTE sequences, so neither should we. */ - as_bad (_("BYTE expression not in the range 0..255")); - mmix_discard_rest_of_line (); - return; - } - - FRAG_APPEND_1_CHAR (exp.X_add_number); - } - break; - } - - SKIP_WHITESPACE (); - c = *input_line_pointer++; - } - while (c == ','); - - input_line_pointer--; - - if (mmix_gnu_syntax) - demand_empty_rest_of_line (); - else - { - mmix_discard_rest_of_line (); - /* Do like demand_empty_rest_of_line and step over the end-of-line - boundary. */ - input_line_pointer++; - } - - /* Make sure we align for the next instruction. */ - last_alignment = 0; -} - -/* Like cons_worker, but we have to ignore "naked comments", not barf on - them. Implements WYDE, TETRA and OCTA. We're a little bit more - lenient than mmix_byte but FIXME: they should eventually merge. */ - -static void -mmix_cons (int nbytes) -{ - expressionS exp; - char *start; - - /* If we don't have any contents, then it's ok to have a specified start - address that is not a multiple of the max data size. We will then - align it as necessary when we get here. Otherwise, it's a fatal sin. */ - if (now_seg == text_section) - { - if (lowest_text_loc != (bfd_vma) -1 - && (lowest_text_loc & (nbytes - 1)) != 0) - { - if (text_has_contents) - as_bad (_("data item with alignment larger than location")); - else if (want_unaligned) - as_bad (_("unaligned data at an absolute location is not supported")); - - lowest_text_loc &= ~((bfd_vma) nbytes - 1); - lowest_text_loc += (bfd_vma) nbytes; - } - - text_has_contents = 1; - } - else if (now_seg == data_section) - { - if (lowest_data_loc != (bfd_vma) -1 - && (lowest_data_loc & (nbytes - 1)) != 0) - { - if (data_has_contents) - as_bad (_("data item with alignment larger than location")); - else if (want_unaligned) - as_bad (_("unaligned data at an absolute location is not supported")); - - lowest_data_loc &= ~((bfd_vma) nbytes - 1); - lowest_data_loc += (bfd_vma) nbytes; - } - - data_has_contents = 1; - } - - /* Always align these unless asked not to (valid for the current pseudo). */ - if (! want_unaligned) - { - last_alignment = nbytes == 2 ? 1 : (nbytes == 4 ? 2 : 3); - frag_align (last_alignment, 0, 0); - record_alignment (now_seg, last_alignment); - } - - /* For mmixal compatibility, a label for an instruction (and emitting - pseudo) refers to the _aligned_ address. So we have to emit the - label here. */ - if (current_fb_label >= 0) - colon (fb_label_name (current_fb_label, 1)); - else if (pending_label != NULL) - { - colon (pending_label); - pending_label = NULL; - } - - SKIP_WHITESPACE (); - - if (is_end_of_line[(unsigned int) *input_line_pointer]) - { - /* Default to zero if the expression was absent. */ - - exp.X_op = O_constant; - exp.X_add_number = 0; - exp.X_unsigned = 0; - exp.X_add_symbol = NULL; - exp.X_op_symbol = NULL; - emit_expr (&exp, (unsigned int) nbytes); - } - else - do - { - unsigned int c; - - switch (*input_line_pointer) - { - /* We support strings here too; each character takes up nbytes - bytes. */ - case '\"': - ++input_line_pointer; - start = input_line_pointer; - while (is_a_char (c = next_char_of_string ())) - { - exp.X_op = O_constant; - exp.X_add_number = c; - exp.X_unsigned = 1; - emit_expr (&exp, (unsigned int) nbytes); - } - - if (input_line_pointer[-1] != '\"') - { - /* We will only get here in rare cases involving #NO_APP, - where the unterminated string is not recognized by the - preformatting pass. */ - as_bad (_("unterminated string")); - mmix_discard_rest_of_line (); - return; - } - break; - - default: - { - expression (&exp); - emit_expr (&exp, (unsigned int) nbytes); - SKIP_WHITESPACE (); - } - break; - } - } - while (*input_line_pointer++ == ','); - - input_line_pointer--; /* Put terminator back into stream. */ - - mmix_handle_rest_of_empty_line (); - - /* We don't need to step up the counter for the current_fb_label here; - that's handled by the caller. */ -} - -/* The md_do_align worker. At present, we just record an alignment to - nullify the automatic alignment we do for WYDE, TETRA and OCTA, as gcc - does not use the unaligned macros when attribute packed is used. - Arguably this is a GCC bug. */ - -void -mmix_md_do_align (int n, char *fill ATTRIBUTE_UNUSED, - int len ATTRIBUTE_UNUSED, int max ATTRIBUTE_UNUSED) -{ - last_alignment = n; - want_unaligned = n == 0; -} |