diff options
Diffstat (limited to 'binutils-2.24/gas/config/tc-vax.c')
| -rw-r--r-- | binutils-2.24/gas/config/tc-vax.c | 3413 |
1 files changed, 0 insertions, 3413 deletions
diff --git a/binutils-2.24/gas/config/tc-vax.c b/binutils-2.24/gas/config/tc-vax.c deleted file mode 100644 index 185a9a24..00000000 --- a/binutils-2.24/gas/config/tc-vax.c +++ /dev/null @@ -1,3413 +0,0 @@ -/* tc-vax.c - vax-specific - - Copyright 1987, 1991, 1992, 1993, 1994, 1995, 1998, 2000, 2001, 2002, - 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 - Free Software Foundation, Inc. - - 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 3, 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. */ - -#include "as.h" - -#include "vax-inst.h" -#include "obstack.h" /* For FRAG_APPEND_1_CHAR macro in "frags.h" */ -#include "subsegs.h" -#include "safe-ctype.h" - -#ifdef OBJ_ELF -#include "elf/vax.h" -#endif - -/* These chars start a comment anywhere in a source file (except inside - another comment */ -const char comment_chars[] = "#"; - -/* These chars only start a comment at the beginning of a line. */ -/* Note that for the VAX the are the same as comment_chars above. */ -const char line_comment_chars[] = "#"; - -const char line_separator_chars[] = ";"; - -/* Chars that can be used to separate mant from exp in floating point nums. */ -const char EXP_CHARS[] = "eE"; - -/* Chars that mean this number is a floating point constant - as in 0f123.456 - or 0H1.234E-12 (see exp chars above). */ -const char FLT_CHARS[] = "dDfFgGhH"; - -/* Also be aware that MAXIMUM_NUMBER_OF_CHARS_FOR_FLOAT may have to be - changed in read.c . Ideally it shouldn't have to know about it at all, - but nothing is ideal around here. */ - -/* Hold details of an operand expression. */ -static expressionS exp_of_operand[VIT_MAX_OPERANDS]; -static segT seg_of_operand[VIT_MAX_OPERANDS]; - -/* A vax instruction after decoding. */ -static struct vit v; - -/* Hold details of big operands. */ -LITTLENUM_TYPE big_operand_bits[VIT_MAX_OPERANDS][SIZE_OF_LARGE_NUMBER]; -FLONUM_TYPE float_operand[VIT_MAX_OPERANDS]; -/* Above is made to point into big_operand_bits by md_begin(). */ - -#ifdef OBJ_ELF -#define GLOBAL_OFFSET_TABLE_NAME "_GLOBAL_OFFSET_TABLE_" -#define PROCEDURE_LINKAGE_TABLE_NAME "_PROCEDURE_LINKAGE_TABLE_" -symbolS *GOT_symbol; /* Pre-defined "_GLOBAL_OFFSET_TABLE_". */ -symbolS *PLT_symbol; /* Pre-defined "_PROCEDURE_LINKAGE_TABLE_". */ -#endif - -int flag_hash_long_names; /* -+ */ -int flag_one; /* -1 */ -int flag_show_after_trunc; /* -H */ -int flag_no_hash_mixed_case; /* -h NUM */ -#ifdef OBJ_ELF -int flag_want_pic; /* -k */ -#endif - -/* For VAX, relative addresses of "just the right length" are easy. - The branch displacement is always the last operand, even in - synthetic instructions. - For VAX, we encode the relax_substateTs (in e.g. fr_substate) as: - - 4 3 2 1 0 bit number - ---/ /--+-------+-------+-------+-------+-------+ - | what state ? | how long ? | - ---/ /--+-------+-------+-------+-------+-------+ - - The "how long" bits are 00=byte, 01=word, 10=long. - This is a Un*x convention. - Not all lengths are legit for a given value of (what state). - The "how long" refers merely to the displacement length. - The address usually has some constant bytes in it as well. - - groups for VAX address relaxing. - - 1. "foo" pc-relative. - length of byte, word, long - - 2a. J<cond> where <cond> is a simple flag test. - length of byte, word, long. - VAX opcodes are: (Hex) - bneq/bnequ 12 - beql/beqlu 13 - bgtr 14 - bleq 15 - bgeq 18 - blss 19 - bgtru 1a - blequ 1b - bvc 1c - bvs 1d - bgequ/bcc 1e - blssu/bcs 1f - Always, you complement 0th bit to reverse condition. - Always, 1-byte opcode, then 1-byte displacement. - - 2b. J<cond> where cond tests a memory bit. - length of byte, word, long. - Vax opcodes are: (Hex) - bbs e0 - bbc e1 - bbss e2 - bbcs e3 - bbsc e4 - bbcc e5 - Always, you complement 0th bit to reverse condition. - Always, 1-byte opcde, longword-address, byte-address, 1-byte-displacement - - 2c. J<cond> where cond tests low-order memory bit - length of byte,word,long. - Vax opcodes are: (Hex) - blbs e8 - blbc e9 - Always, you complement 0th bit to reverse condition. - Always, 1-byte opcode, longword-address, 1-byte displacement. - - 3. Jbs/Jbr. - length of byte,word,long. - Vax opcodes are: (Hex) - bsbb 10 - brb 11 - These are like (2) but there is no condition to reverse. - Always, 1 byte opcode, then displacement/absolute. - - 4a. JacbX - length of word, long. - Vax opcodes are: (Hex) - acbw 3d - acbf 4f - acbd 6f - abcb 9d - acbl f1 - acbg 4ffd - acbh 6ffd - Always, we cannot reverse the sense of the branch; we have a word - displacement. - The double-byte op-codes don't hurt: we never want to modify the - opcode, so we don't care how many bytes are between the opcode and - the operand. - - 4b. JXobXXX - length of long, long, byte. - Vax opcodes are: (Hex) - aoblss f2 - aobleq f3 - sobgeq f4 - sobgtr f5 - Always, we cannot reverse the sense of the branch; we have a byte - displacement. - - The only time we need to modify the opcode is for class 2 instructions. - After relax() we may complement the lowest order bit of such instruction - to reverse sense of branch. - - For class 2 instructions, we store context of "where is the opcode literal". - We can change an opcode's lowest order bit without breaking anything else. - - We sometimes store context in the operand literal. This way we can figure out - after relax() what the original addressing mode was. */ - -/* These displacements are relative to the start address of the - displacement. The first letter is Byte, Word. 2nd letter is - Forward, Backward. */ -#define BF (1+ 127) -#define BB (1+-128) -#define WF (2+ 32767) -#define WB (2+-32768) -/* Dont need LF, LB because they always reach. [They are coded as 0.] */ - -#define C(a,b) ENCODE_RELAX(a,b) -/* This macro has no side-effects. */ -#define ENCODE_RELAX(what,length) (((what) << 2) + (length)) -#define RELAX_STATE(s) ((s) >> 2) -#define RELAX_LENGTH(s) ((s) & 3) - -const relax_typeS md_relax_table[] = -{ - {1, 1, 0, 0}, /* error sentinel 0,0 */ - {1, 1, 0, 0}, /* unused 0,1 */ - {1, 1, 0, 0}, /* unused 0,2 */ - {1, 1, 0, 0}, /* unused 0,3 */ - - {BF + 1, BB + 1, 2, C (1, 1)},/* B^"foo" 1,0 */ - {WF + 1, WB + 1, 3, C (1, 2)},/* W^"foo" 1,1 */ - {0, 0, 5, 0}, /* L^"foo" 1,2 */ - {1, 1, 0, 0}, /* unused 1,3 */ - - {BF, BB, 1, C (2, 1)}, /* b<cond> B^"foo" 2,0 */ - {WF + 2, WB + 2, 4, C (2, 2)},/* br.+? brw X 2,1 */ - {0, 0, 7, 0}, /* br.+? jmp X 2,2 */ - {1, 1, 0, 0}, /* unused 2,3 */ - - {BF, BB, 1, C (3, 1)}, /* brb B^foo 3,0 */ - {WF, WB, 2, C (3, 2)}, /* brw W^foo 3,1 */ - {0, 0, 5, 0}, /* Jmp L^foo 3,2 */ - {1, 1, 0, 0}, /* unused 3,3 */ - - {1, 1, 0, 0}, /* unused 4,0 */ - {WF, WB, 2, C (4, 2)}, /* acb_ ^Wfoo 4,1 */ - {0, 0, 10, 0}, /* acb_,br,jmp L^foo4,2 */ - {1, 1, 0, 0}, /* unused 4,3 */ - - {BF, BB, 1, C (5, 1)}, /* Xob___,,foo 5,0 */ - {WF + 4, WB + 4, 6, C (5, 2)},/* Xob.+2,brb.+3,brw5,1 */ - {0, 0, 9, 0}, /* Xob.+2,brb.+6,jmp5,2 */ - {1, 1, 0, 0}, /* unused 5,3 */ -}; - -#undef C -#undef BF -#undef BB -#undef WF -#undef WB - -void float_cons (int); -int flonum_gen2vax (char, FLONUM_TYPE *, LITTLENUM_TYPE *); - -const pseudo_typeS md_pseudo_table[] = -{ - {"dfloat", float_cons, 'd'}, - {"ffloat", float_cons, 'f'}, - {"gfloat", float_cons, 'g'}, - {"hfloat", float_cons, 'h'}, - {"d_floating", float_cons, 'd'}, - {"f_floating", float_cons, 'f'}, - {"g_floating", float_cons, 'g'}, - {"h_floating", float_cons, 'h'}, - {NULL, NULL, 0}, -}; - -#define STATE_PC_RELATIVE (1) -#define STATE_CONDITIONAL_BRANCH (2) -#define STATE_ALWAYS_BRANCH (3) /* includes BSB... */ -#define STATE_COMPLEX_BRANCH (4) -#define STATE_COMPLEX_HOP (5) - -#define STATE_BYTE (0) -#define STATE_WORD (1) -#define STATE_LONG (2) -#define STATE_UNDF (3) /* Symbol undefined in pass1. */ - -#define min(a, b) ((a) < (b) ? (a) : (b)) - -void -md_number_to_chars (char con[], valueT value, int nbytes) -{ - number_to_chars_littleendian (con, value, nbytes); -} - -/* Fix up some data or instructions after we find out the value of a symbol - that they reference. */ - -void /* Knows about order of bytes in address. */ -md_apply_fix (fixS *fixP, valueT *valueP, segT seg ATTRIBUTE_UNUSED) -{ - valueT value = * valueP; - - if (((fixP->fx_addsy == NULL && fixP->fx_subsy == NULL) - && fixP->fx_r_type != BFD_RELOC_32_PLT_PCREL - && fixP->fx_r_type != BFD_RELOC_32_GOT_PCREL) - || fixP->fx_r_type == NO_RELOC) - number_to_chars_littleendian (fixP->fx_where + fixP->fx_frag->fr_literal, - value, fixP->fx_size); - - if (fixP->fx_addsy == NULL && fixP->fx_pcrel == 0) - fixP->fx_done = 1; -} - -/* Convert a number from VAX byte order (little endian) - into host byte order. - con is the buffer to convert, - nbytes is the length of the given buffer. */ -static long -md_chars_to_number (unsigned char con[], int nbytes) -{ - long retval; - - for (retval = 0, con += nbytes - 1; nbytes--; con--) - { - retval <<= BITS_PER_CHAR; - retval |= *con; - } - return retval; -} - -/* Copy a bignum from in to out. - If the output is shorter than the input, copy lower-order - littlenums. Return 0 or the number of significant littlenums - dropped. Assumes littlenum arrays are densely packed: no unused - chars between the littlenums. Uses memcpy() to move littlenums, and - wants to know length (in chars) of the input bignum. */ - -static int -bignum_copy (LITTLENUM_TYPE *in, - int in_length, /* in sizeof(littlenum)s */ - LITTLENUM_TYPE *out, - int out_length /* in sizeof(littlenum)s */) -{ - int significant_littlenums_dropped; - - if (out_length < in_length) - { - LITTLENUM_TYPE *p; /* -> most significant (non-zero) input - littlenum. */ - - memcpy ((void *) out, (void *) in, - (unsigned int) out_length << LITTLENUM_SHIFT); - for (p = in + in_length - 1; p >= in; --p) - { - if (*p) - break; - } - significant_littlenums_dropped = p - in - in_length + 1; - - if (significant_littlenums_dropped < 0) - significant_littlenums_dropped = 0; - } - else - { - memcpy ((char *) out, (char *) in, - (unsigned int) in_length << LITTLENUM_SHIFT); - - if (out_length > in_length) - memset ((char *) (out + in_length), '\0', - (unsigned int) (out_length - in_length) << LITTLENUM_SHIFT); - - significant_littlenums_dropped = 0; - } - - return significant_littlenums_dropped; -} - -/* md_estimate_size_before_relax(), called just before relax(). - Any symbol that is now undefined will not become defined. - Return the correct fr_subtype in the frag and the growth beyond - fr_fix. */ -int -md_estimate_size_before_relax (fragS *fragP, segT segment) -{ - if (RELAX_LENGTH (fragP->fr_subtype) == STATE_UNDF) - { - if (S_GET_SEGMENT (fragP->fr_symbol) != segment -#ifdef OBJ_ELF - || S_IS_WEAK (fragP->fr_symbol) - || S_IS_EXTERNAL (fragP->fr_symbol) -#endif - ) - { - /* Non-relaxable cases. */ - int reloc_type = NO_RELOC; - char *p; - int old_fr_fix; - - old_fr_fix = fragP->fr_fix; - p = fragP->fr_literal + old_fr_fix; -#ifdef OBJ_ELF - /* If this is to an undefined symbol, then if it's an indirect - reference indicate that is can mutated into a GLOB_DAT or - JUMP_SLOT by the loader. We restrict ourselves to no offset - due to a limitation in the NetBSD linker. */ - - if (GOT_symbol == NULL) - GOT_symbol = symbol_find (GLOBAL_OFFSET_TABLE_NAME); - if (PLT_symbol == NULL) - PLT_symbol = symbol_find (PROCEDURE_LINKAGE_TABLE_NAME); - if ((GOT_symbol == NULL || fragP->fr_symbol != GOT_symbol) - && (PLT_symbol == NULL || fragP->fr_symbol != PLT_symbol) - && fragP->fr_symbol != NULL - && flag_want_pic - && (!S_IS_DEFINED (fragP->fr_symbol) - || S_IS_WEAK (fragP->fr_symbol) - || S_IS_EXTERNAL (fragP->fr_symbol))) - { - /* Indirect references cannot go through the GOT or PLT, - let's hope they'll become local in the final link. */ - if ((ELF_ST_VISIBILITY (S_GET_OTHER (fragP->fr_symbol)) - != STV_DEFAULT) - || (p[0] & 0x10)) - reloc_type = BFD_RELOC_32_PCREL; - else if (((unsigned char *) fragP->fr_opcode)[0] == VAX_CALLS - || ((unsigned char *) fragP->fr_opcode)[0] == VAX_CALLG - || ((unsigned char *) fragP->fr_opcode)[0] == VAX_JSB - || ((unsigned char *) fragP->fr_opcode)[0] == VAX_JMP - || S_IS_FUNCTION (fragP->fr_symbol)) - reloc_type = BFD_RELOC_32_PLT_PCREL; - else - reloc_type = BFD_RELOC_32_GOT_PCREL; - } -#endif - switch (RELAX_STATE (fragP->fr_subtype)) - { - case STATE_PC_RELATIVE: - p[0] |= VAX_PC_RELATIVE_MODE; /* Preserve @ bit. */ - fragP->fr_fix += 1 + 4; - fix_new (fragP, old_fr_fix + 1, 4, fragP->fr_symbol, - fragP->fr_offset, 1, reloc_type); - break; - - case STATE_CONDITIONAL_BRANCH: - *fragP->fr_opcode ^= 1; /* Reverse sense of branch. */ - p[0] = 6; - p[1] = VAX_JMP; - p[2] = VAX_PC_RELATIVE_MODE; /* ...(PC) */ - fragP->fr_fix += 1 + 1 + 1 + 4; - fix_new (fragP, old_fr_fix + 3, 4, fragP->fr_symbol, - fragP->fr_offset, 1, NO_RELOC); - break; - - case STATE_COMPLEX_BRANCH: - p[0] = 2; - p[1] = 0; - p[2] = VAX_BRB; - p[3] = 6; - p[4] = VAX_JMP; - p[5] = VAX_PC_RELATIVE_MODE; /* ...(pc) */ - fragP->fr_fix += 2 + 2 + 1 + 1 + 4; - fix_new (fragP, old_fr_fix + 6, 4, fragP->fr_symbol, - fragP->fr_offset, 1, NO_RELOC); - break; - - case STATE_COMPLEX_HOP: - p[0] = 2; - p[1] = VAX_BRB; - p[2] = 6; - p[3] = VAX_JMP; - p[4] = VAX_PC_RELATIVE_MODE; /* ...(pc) */ - fragP->fr_fix += 1 + 2 + 1 + 1 + 4; - fix_new (fragP, old_fr_fix + 5, 4, fragP->fr_symbol, - fragP->fr_offset, 1, NO_RELOC); - break; - - case STATE_ALWAYS_BRANCH: - *fragP->fr_opcode += VAX_WIDEN_LONG; - p[0] = VAX_PC_RELATIVE_MODE; /* ...(PC) */ - fragP->fr_fix += 1 + 4; - fix_new (fragP, old_fr_fix + 1, 4, fragP->fr_symbol, - fragP->fr_offset, 1, NO_RELOC); - break; - - default: - abort (); - } - frag_wane (fragP); - - /* Return the growth in the fixed part of the frag. */ - return fragP->fr_fix - old_fr_fix; - } - - /* Relaxable cases. Set up the initial guess for the variable - part of the frag. */ - switch (RELAX_STATE (fragP->fr_subtype)) - { - case STATE_PC_RELATIVE: - fragP->fr_subtype = ENCODE_RELAX (STATE_PC_RELATIVE, STATE_BYTE); - break; - case STATE_CONDITIONAL_BRANCH: - fragP->fr_subtype = ENCODE_RELAX (STATE_CONDITIONAL_BRANCH, STATE_BYTE); - break; - case STATE_COMPLEX_BRANCH: - fragP->fr_subtype = ENCODE_RELAX (STATE_COMPLEX_BRANCH, STATE_WORD); - break; - case STATE_COMPLEX_HOP: - fragP->fr_subtype = ENCODE_RELAX (STATE_COMPLEX_HOP, STATE_BYTE); - break; - case STATE_ALWAYS_BRANCH: - fragP->fr_subtype = ENCODE_RELAX (STATE_ALWAYS_BRANCH, STATE_BYTE); - break; - } - } - - if (fragP->fr_subtype >= sizeof (md_relax_table) / sizeof (md_relax_table[0])) - abort (); - - /* Return the size of the variable part of the frag. */ - return md_relax_table[fragP->fr_subtype].rlx_length; -} - -/* Called after relax() is finished. - In: Address of frag. - fr_type == rs_machine_dependent. - fr_subtype is what the address relaxed to. - - Out: Any fixSs and constants are set up. - Caller will turn frag into a ".space 0". */ -void -md_convert_frag (bfd *headers ATTRIBUTE_UNUSED, - segT seg ATTRIBUTE_UNUSED, - fragS *fragP) -{ - char *addressP; /* -> _var to change. */ - char *opcodeP; /* -> opcode char(s) to change. */ - short int extension = 0; /* Size of relaxed address. */ - /* Added to fr_fix: incl. ALL var chars. */ - symbolS *symbolP; - long where; - - know (fragP->fr_type == rs_machine_dependent); - where = fragP->fr_fix; - addressP = fragP->fr_literal + where; - opcodeP = fragP->fr_opcode; - symbolP = fragP->fr_symbol; - know (symbolP); - - switch (fragP->fr_subtype) - { - case ENCODE_RELAX (STATE_PC_RELATIVE, STATE_BYTE): - know (*addressP == 0 || *addressP == 0x10); /* '@' bit. */ - addressP[0] |= 0xAF; /* Byte displacement. */ - fix_new (fragP, fragP->fr_fix + 1, 1, fragP->fr_symbol, - fragP->fr_offset, 1, NO_RELOC); - extension = 2; - break; - - case ENCODE_RELAX (STATE_PC_RELATIVE, STATE_WORD): - know (*addressP == 0 || *addressP == 0x10); /* '@' bit. */ - addressP[0] |= 0xCF; /* Word displacement. */ - fix_new (fragP, fragP->fr_fix + 1, 2, fragP->fr_symbol, - fragP->fr_offset, 1, NO_RELOC); - extension = 3; - break; - - case ENCODE_RELAX (STATE_PC_RELATIVE, STATE_LONG): - know (*addressP == 0 || *addressP == 0x10); /* '@' bit. */ - addressP[0] |= 0xEF; /* Long word displacement. */ - fix_new (fragP, fragP->fr_fix + 1, 4, fragP->fr_symbol, - fragP->fr_offset, 1, NO_RELOC); - extension = 5; - break; - - case ENCODE_RELAX (STATE_CONDITIONAL_BRANCH, STATE_BYTE): - fix_new (fragP, fragP->fr_fix, 1, fragP->fr_symbol, - fragP->fr_offset, 1, NO_RELOC); - extension = 1; - break; - - case ENCODE_RELAX (STATE_CONDITIONAL_BRANCH, STATE_WORD): - opcodeP[0] ^= 1; /* Reverse sense of test. */ - addressP[0] = 3; - addressP[1] = VAX_BRW; - fix_new (fragP, fragP->fr_fix + 2, 2, fragP->fr_symbol, - fragP->fr_offset, 1, NO_RELOC); - extension = 4; - break; - - case ENCODE_RELAX (STATE_CONDITIONAL_BRANCH, STATE_LONG): - opcodeP[0] ^= 1; /* Reverse sense of test. */ - addressP[0] = 6; - addressP[1] = VAX_JMP; - addressP[2] = VAX_PC_RELATIVE_MODE; - fix_new (fragP, fragP->fr_fix + 3, 4, fragP->fr_symbol, - fragP->fr_offset, 1, NO_RELOC); - extension = 7; - break; - - case ENCODE_RELAX (STATE_ALWAYS_BRANCH, STATE_BYTE): - fix_new (fragP, fragP->fr_fix, 1, fragP->fr_symbol, - fragP->fr_offset, 1, NO_RELOC); - extension = 1; - break; - - case ENCODE_RELAX (STATE_ALWAYS_BRANCH, STATE_WORD): - opcodeP[0] += VAX_WIDEN_WORD; /* brb -> brw, bsbb -> bsbw */ - fix_new (fragP, fragP->fr_fix, 2, fragP->fr_symbol, fragP->fr_offset, - 1, NO_RELOC); - extension = 2; - break; - - case ENCODE_RELAX (STATE_ALWAYS_BRANCH, STATE_LONG): - opcodeP[0] += VAX_WIDEN_LONG; /* brb -> jmp, bsbb -> jsb */ - addressP[0] = VAX_PC_RELATIVE_MODE; - fix_new (fragP, fragP->fr_fix + 1, 4, fragP->fr_symbol, - fragP->fr_offset, 1, NO_RELOC); - extension = 5; - break; - - case ENCODE_RELAX (STATE_COMPLEX_BRANCH, STATE_WORD): - fix_new (fragP, fragP->fr_fix, 2, fragP->fr_symbol, - fragP->fr_offset, 1, NO_RELOC); - extension = 2; - break; - - case ENCODE_RELAX (STATE_COMPLEX_BRANCH, STATE_LONG): - addressP[0] = 2; - addressP[1] = 0; - addressP[2] = VAX_BRB; - addressP[3] = 6; - addressP[4] = VAX_JMP; - addressP[5] = VAX_PC_RELATIVE_MODE; - fix_new (fragP, fragP->fr_fix + 6, 4, fragP->fr_symbol, - fragP->fr_offset, 1, NO_RELOC); - extension = 10; - break; - - case ENCODE_RELAX (STATE_COMPLEX_HOP, STATE_BYTE): - fix_new (fragP, fragP->fr_fix, 1, fragP->fr_symbol, - fragP->fr_offset, 1, NO_RELOC); - extension = 1; - break; - - case ENCODE_RELAX (STATE_COMPLEX_HOP, STATE_WORD): - addressP[0] = 2; - addressP[1] = VAX_BRB; - addressP[2] = 3; - addressP[3] = VAX_BRW; - fix_new (fragP, fragP->fr_fix + 4, 2, fragP->fr_symbol, - fragP->fr_offset, 1, NO_RELOC); - extension = 6; - break; - - case ENCODE_RELAX (STATE_COMPLEX_HOP, STATE_LONG): - addressP[0] = 2; - addressP[1] = VAX_BRB; - addressP[2] = 6; - addressP[3] = VAX_JMP; - addressP[4] = VAX_PC_RELATIVE_MODE; - fix_new (fragP, fragP->fr_fix + 5, 4, fragP->fr_symbol, - fragP->fr_offset, 1, NO_RELOC); - extension = 9; - break; - - default: - BAD_CASE (fragP->fr_subtype); - break; - } - fragP->fr_fix += extension; -} - -/* Translate internal format of relocation info into target format. - - On vax: first 4 bytes are normal unsigned long, next three bytes - are symbolnum, least sig. byte first. Last byte is broken up with - the upper nibble as nuthin, bit 3 as extern, bits 2 & 1 as length, and - bit 0 as pcrel. */ -#ifdef comment -void -md_ri_to_chars (char *the_bytes, struct reloc_info_generic ri) -{ - /* This is easy. */ - md_number_to_chars (the_bytes, ri.r_address, sizeof (ri.r_address)); - /* Now the fun stuff. */ - the_bytes[6] = (ri.r_symbolnum >> 16) & 0x0ff; - the_bytes[5] = (ri.r_symbolnum >> 8) & 0x0ff; - the_bytes[4] = ri.r_symbolnum & 0x0ff; - the_bytes[7] = (((ri.r_extern << 3) & 0x08) | ((ri.r_length << 1) & 0x06) - | ((ri.r_pcrel << 0) & 0x01)) & 0x0F; -} - -#endif /* comment */ - -/* BUGS, GRIPES, APOLOGIA, etc. - - The opcode table 'votstrs' needs to be sorted on opcode frequency. - That is, AFTER we hash it with hash_...(), we want most-used opcodes - to come out of the hash table faster. - - I am sorry to inflict yet another VAX assembler on the world, but - RMS says we must do everything from scratch, to prevent pin-heads - restricting this software. - - This is a vaguely modular set of routines in C to parse VAX - assembly code using DEC mnemonics. It is NOT un*x specific. - - The idea here is that the assembler has taken care of all: - labels - macros - listing - pseudo-ops - line continuation - comments - condensing any whitespace down to exactly one space - and all we have to do is parse 1 line into a vax instruction - partially formed. We will accept a line, and deliver: - an error message (hopefully empty) - a skeleton VAX instruction (tree structure) - textual pointers to all the operand expressions - a warning message that notes a silly operand (hopefully empty) - - E D I T H I S T O R Y - - 17may86 Dean Elsner. Bug if line ends immediately after opcode. - 30apr86 Dean Elsner. New vip_op() uses arg block so change call. - 6jan86 Dean Elsner. Crock vip_begin() to call vip_op_defaults(). - 2jan86 Dean Elsner. Invent synthetic opcodes. - Widen vax_opcodeT to 32 bits. Use a bit for VIT_OPCODE_SYNTHETIC, - which means this is not a real opcode, it is like a macro; it will - be relax()ed into 1 or more instructions. - Use another bit for VIT_OPCODE_SPECIAL if the op-code is not optimised - like a regular branch instruction. Option added to vip_begin(): - exclude synthetic opcodes. Invent synthetic_votstrs[]. - 31dec85 Dean Elsner. Invent vit_opcode_nbytes. - Also make vit_opcode into a char[]. We now have n-byte vax opcodes, - so caller's don't have to know the difference between a 1-byte & a - 2-byte op-code. Still need vax_opcodeT concept, so we know how - big an object must be to hold an op.code. - 30dec85 Dean Elsner. Widen typedef vax_opcodeT in "vax-inst.h" - because vax opcodes may be 16 bits. Our crufty C compiler was - happily initialising 8-bit vot_codes with 16-bit numbers! - (Wouldn't the 'phone company like to compress data so easily!) - 29dec85 Dean Elsner. New static table vax_operand_width_size[]. - Invented so we know hw many bytes a "I^#42" needs in its immediate - operand. Revised struct vop in "vax-inst.h": explicitly include - byte length of each operand, and it's letter-code datum type. - 17nov85 Dean Elsner. Name Change. - Due to ar(1) truncating names, we learned the hard way that - "vax-inst-parse.c" -> "vax-inst-parse." dropping the "o" off - the archived object name. SO... we shortened the name of this - source file, and changed the makefile. */ - -/* Handle of the OPCODE hash table. */ -static struct hash_control *op_hash; - -/* In: 1 character, from "bdfghloqpw" being the data-type of an operand - of a vax instruction. - - Out: the length of an operand of that type, in bytes. - Special branch operands types "-?!" have length 0. */ - -static const short int vax_operand_width_size[256] = -{ - 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, - 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, - 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, - 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, - 0, 0, 1, 0, 8, 0, 4, 8, 16, 0, 0, 0, 4, 0, 0,16, /* ..b.d.fgh...l..o */ - 0, 8, 0, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0, 0, /* .q.....w........ */ - 0, 0, 1, 0, 8, 0, 4, 8, 16, 0, 0, 0, 4, 0, 0,16, /* ..b.d.fgh...l..o */ - 0, 8, 0, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0, 0, /* .q.....w........ */ - 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, - 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, - 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, - 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, - 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, - 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, - 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, - 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, -}; - -/* This perversion encodes all the vax opcodes as a bunch of strings. - RMS says we should build our hash-table at run-time. Hmm. - Please would someone arrange these in decreasing frequency of opcode? - Because of the way hash_...() works, the most frequently used opcode - should be textually first and so on. - - Input for this table was 'vax.opcodes', awk(1)ed by 'vax.opcodes.c.awk' . - So change 'vax.opcodes', then re-generate this table. */ - -#include "opcode/vax.h" - -/* This is a table of optional op-codes. All of them represent - 'synthetic' instructions that seem popular. - - Here we make some pseudo op-codes. Every code has a bit set to say - it is synthetic. This lets you catch them if you want to - ban these opcodes. They are mnemonics for "elastic" instructions - that are supposed to assemble into the fewest bytes needed to do a - branch, or to do a conditional branch, or whatever. - - The opcode is in the usual place [low-order n*8 bits]. This means - that if you mask off the bucky bits, the usual rules apply about - how long the opcode is. - - All VAX branch displacements come at the end of the instruction. - For simple branches (1-byte opcode + 1-byte displacement) the last - operand is coded 'b?' where the "data type" '?' is a clue that we - may reverse the sense of the branch (complement lowest order bit) - and branch around a jump. This is by far the most common case. - That is why the VIT_OPCODE_SYNTHETIC bit is set: it says this is - a 0-byte op-code followed by 2 or more bytes of operand address. - - If the op-code has VIT_OPCODE_SPECIAL set, then we have a more unusual - case. - - For JBSB & JBR the treatment is the similar, except (1) we have a 'bw' - option before (2) we can directly JSB/JMP because there is no condition. - These operands have 'b-' as their access/data type. - - That leaves a bunch of random opcodes: JACBx, JxOBxxx. In these - cases, we do the same idea. JACBxxx are all marked with a 'b!' - JAOBxxx & JSOBxxx are marked with a 'b:'. */ -#if (VIT_OPCODE_SYNTHETIC != 0x80000000) -#error "You have just broken the encoding below, which assumes the sign bit means 'I am an imaginary instruction'." -#endif - -#if (VIT_OPCODE_SPECIAL != 0x40000000) -#error "You have just broken the encoding below, which assumes the 0x40 M bit means 'I am not to be "optimised" the way normal branches are'." -#endif - -static const struct vot - synthetic_votstrs[] = -{ - {"jbsb", {"b-", 0xC0000010}}, /* BSD 4.2 */ -/* jsb used already */ - {"jbr", {"b-", 0xC0000011}}, /* BSD 4.2 */ - {"jr", {"b-", 0xC0000011}}, /* consistent */ - {"jneq", {"b?", 0x80000012}}, - {"jnequ", {"b?", 0x80000012}}, - {"jeql", {"b?", 0x80000013}}, - {"jeqlu", {"b?", 0x80000013}}, - {"jgtr", {"b?", 0x80000014}}, - {"jleq", {"b?", 0x80000015}}, -/* un-used opcodes here */ - {"jgeq", {"b?", 0x80000018}}, - {"jlss", {"b?", 0x80000019}}, - {"jgtru", {"b?", 0x8000001a}}, - {"jlequ", {"b?", 0x8000001b}}, - {"jvc", {"b?", 0x8000001c}}, - {"jvs", {"b?", 0x8000001d}}, - {"jgequ", {"b?", 0x8000001e}}, - {"jcc", {"b?", 0x8000001e}}, - {"jlssu", {"b?", 0x8000001f}}, - {"jcs", {"b?", 0x8000001f}}, - - {"jacbw", {"rwrwmwb!", 0xC000003d}}, - {"jacbf", {"rfrfmfb!", 0xC000004f}}, - {"jacbd", {"rdrdmdb!", 0xC000006f}}, - {"jacbb", {"rbrbmbb!", 0xC000009d}}, - {"jacbl", {"rlrlmlb!", 0xC00000f1}}, - {"jacbg", {"rgrgmgb!", 0xC0004ffd}}, - {"jacbh", {"rhrhmhb!", 0xC0006ffd}}, - - {"jbs", {"rlvbb?", 0x800000e0}}, - {"jbc", {"rlvbb?", 0x800000e1}}, - {"jbss", {"rlvbb?", 0x800000e2}}, - {"jbcs", {"rlvbb?", 0x800000e3}}, - {"jbsc", {"rlvbb?", 0x800000e4}}, - {"jbcc", {"rlvbb?", 0x800000e5}}, - {"jbssi", {"rlvbb?", 0x800000e6}}, - {"jbcci", {"rlvbb?", 0x800000e7}}, - {"jlbs", {"rlb?", 0x800000e8}}, - {"jlbc", {"rlb?", 0x800000e9}}, - - {"jaoblss", {"rlmlb:", 0xC00000f2}}, - {"jaobleq", {"rlmlb:", 0xC00000f3}}, - {"jsobgeq", {"mlb:", 0xC00000f4}}, - {"jsobgtr", {"mlb:", 0xC00000f5}}, - -/* CASEx has no branch addresses in our conception of it. */ -/* You should use ".word ..." statements after the "case ...". */ - - {"", {"", 0}} /* Empty is end sentinel. */ -}; - -/* Because this module is useful for both VMS and UN*X style assemblers - and because of the variety of UN*X assemblers we must recognise - the different conventions for assembler operand notation. For example - VMS says "#42" for immediate mode, while most UN*X say "$42". - We permit arbitrary sets of (single) characters to represent the - 3 concepts that DEC writes '#', '@', '^'. */ - -/* Character tests. */ -#define VIP_IMMEDIATE 01 /* Character is like DEC # */ -#define VIP_INDIRECT 02 /* Char is like DEC @ */ -#define VIP_DISPLEN 04 /* Char is like DEC ^ */ - -#define IMMEDIATEP(c) (vip_metacharacters [(c) & 0xff] & VIP_IMMEDIATE) -#define INDIRECTP(c) (vip_metacharacters [(c) & 0xff] & VIP_INDIRECT) -#define DISPLENP(c) (vip_metacharacters [(c) & 0xff] & VIP_DISPLEN) - -/* We assume 8 bits per byte. Use vip_op_defaults() to set these up BEFORE we - are ever called. */ - -#if defined(CONST_TABLE) -#define _ 0, -#define I VIP_IMMEDIATE, -#define S VIP_INDIRECT, -#define D VIP_DISPLEN, -static const char -vip_metacharacters[256] = -{ - _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ /* ^@ ^A ^B ^C ^D ^E ^F ^G ^H ^I ^J ^K ^L ^M ^N ^O*/ - _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ /* ^P ^Q ^R ^S ^T ^U ^V ^W ^X ^Y ^Z ^[ ^\ ^] ^^ ^_ */ - _ _ _ _ I _ _ _ _ _ S _ _ _ _ _ /* sp ! " # $ % & ' ( ) * + , - . / */ - _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ /*0 1 2 3 4 5 6 7 8 9 : ; < = > ?*/ - _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ /*@ A B C D E F G H I J K L M N O*/ - _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ /*P Q R S T U V W X Y Z [ \ ] ^ _*/ - D _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ /*` a b c d e f g h i j k l m n o*/ - _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ /*p q r s t u v w x y z { | } ~ ^?*/ - - _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ - _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ - _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ - _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ - _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ - _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ - _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ - _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ -}; -#undef _ -#undef I -#undef S -#undef D - -#else - -static char vip_metacharacters[256]; - -static void -vip_op_1 (int bit, const char *syms) -{ - unsigned char t; - - while ((t = *syms++) != 0) - vip_metacharacters[t] |= bit; -} - -/* Can be called any time. More arguments may appear in future. */ -static void -vip_op_defaults (const char *immediate, const char *indirect, const char *displen) -{ - vip_op_1 (VIP_IMMEDIATE, immediate); - vip_op_1 (VIP_INDIRECT, indirect); - vip_op_1 (VIP_DISPLEN, displen); -} - -#endif - -/* Call me once before you decode any lines. - I decode votstrs into a hash table at op_hash (which I create). - I return an error text or null. - If you want, I will include the 'synthetic' jXXX instructions in the - instruction table. - You must nominate metacharacters for eg DEC's "#", "@", "^". */ - -static const char * -vip_begin (int synthetic_too, /* 1 means include jXXX op-codes. */ - const char *immediate, - const char *indirect, - const char *displen) -{ - const struct vot *vP; /* scan votstrs */ - const char *retval = 0; /* error text */ - - op_hash = hash_new (); - - for (vP = votstrs; *vP->vot_name && !retval; vP++) - retval = hash_insert (op_hash, vP->vot_name, (void *) &vP->vot_detail); - - if (synthetic_too) - for (vP = synthetic_votstrs; *vP->vot_name && !retval; vP++) - retval = hash_insert (op_hash, vP->vot_name, (void *) &vP->vot_detail); - -#ifndef CONST_TABLE - vip_op_defaults (immediate, indirect, displen); -#endif - - return retval; -} - -/* Take 3 char.s, the last of which may be `\0` (non-existent) - and return the VAX register number that they represent. - - Return -1 if they don't form a register name. Good names return - a number from 0:15 inclusive. - - Case is not important in a name. - - Register names understood are: - - R0 - R1 - R2 - R3 - R4 - R5 - R6 - R7 - R8 - R9 - R10 - R11 - R12 AP - R13 FP - R14 SP - R15 PC */ - -#define AP 12 -#define FP 13 -#define SP 14 -#define PC 15 - -/* Returns the register number of something like '%r15' or 'ap', supplied - in four single chars. Returns -1 if the register isn't recognized, - 0..15 otherwise. */ -static int -vax_reg_parse (char c1, char c2, char c3, char c4) -{ - int retval = -1; - -#ifdef OBJ_ELF - if (c1 != '%') /* Register prefixes are mandatory for ELF. */ - return retval; - c1 = c2; - c2 = c3; - c3 = c4; -#endif -#ifdef OBJ_VMS - if (c4 != 0) /* Register prefixes are not allowed under VMS. */ - return retval; -#endif -#ifdef OBJ_AOUT - if (c1 == '%') /* Register prefixes are optional under a.out. */ - { - c1 = c2; - c2 = c3; - c3 = c4; - } - else if (c3 && c4) /* Can't be 4 characters long. */ - return retval; -#endif - - c1 = TOLOWER (c1); - c2 = TOLOWER (c2); - if (ISDIGIT (c2) && c1 == 'r') - { - retval = c2 - '0'; - if (ISDIGIT (c3)) - { - retval = retval * 10 + c3 - '0'; - retval = (retval > 15) ? -1 : retval; - /* clamp the register value to 1 hex digit */ - } - else if (c3) - retval = -1; /* c3 must be '\0' or a digit. */ - } - else if (c3) /* There are no three letter regs. */ - retval = -1; - else if (c2 == 'p') - { - switch (c1) - { - case 's': - retval = SP; - break; - case 'f': - retval = FP; - break; - case 'a': - retval = AP; - break; - default: - retval = -1; - } - } - else if (c1 == 'p' && c2 == 'c') - retval = PC; - else - retval = -1; - return retval; -} - -/* Parse a vax operand in DEC assembler notation. - For speed, expect a string of whitespace to be reduced to a single ' '. - This is the case for GNU AS, and is easy for other DEC-compatible - assemblers. - - Knowledge about DEC VAX assembler operand notation lives here. - This doesn't even know what a register name is, except it believes - all register names are 2 or 3 characters, and lets vax_reg_parse() say - what number each name represents. - It does, however, know that PC, SP etc are special registers so it can - detect addressing modes that are silly for those registers. - - Where possible, it delivers 1 fatal or 1 warning message if the operand - is suspect. Exactly what we test for is still evolving. - - --- - Arg block. - - There were a number of 'mismatched argument type' bugs to vip_op. - The most general solution is to typedef each (of many) arguments. - We used instead a typedef'd argument block. This is less modular - than using separate return pointers for each result, but runs faster - on most engines, and seems to keep programmers happy. It will have - to be done properly if we ever want to use vip_op as a general-purpose - module (it was designed to be). - - G^ - - Doesn't support DEC "G^" format operands. These always take 5 bytes - to express, and code as modes 8F or 9F. Reason: "G^" deprives you of - optimising to (say) a "B^" if you are lucky in the way you link. - When someone builds a linker smart enough to convert "G^" to "B^", "W^" - whenever possible, then we should implement it. - If there is some other use for "G^", feel free to code it in! - - speed - - If I nested if()s more, I could avoid testing (*err) which would save - time, space and page faults. I didn't nest all those if()s for clarity - and because I think the mode testing can be re-arranged 1st to test the - commoner constructs 1st. Does anybody have statistics on this? - - error messages - - In future, we should be able to 'compose' error messages in a scratch area - and give the user MUCH more informative error messages. Although this takes - a little more code at run-time, it will make this module much more self- - documenting. As an example of what sucks now: most error messages have - hardwired into them the DEC VAX metacharacters "#^@" which are nothing like - the Un*x characters "$`*", that most users will expect from this AS. - - ---- - - The input is a string, ending with '\0'. - - We also require a 'hint' of what kind of operand is expected: so - we can remind caller not to write into literals for instance. - - The output is a skeletal instruction. - - The algorithm has two parts. - 1. extract the syntactic features (parse off all the @^#-()+[] mode crud); - 2. express the @^#-()+[] as some parameters suited to further analysis. - - 2nd step is where we detect the googles of possible invalid combinations - a human (or compiler) might write. Note that if we do a half-way - decent assembler, we don't know how long to make (eg) displacement - fields when we first meet them (because they may not have defined values). - So we must wait until we know how many bits are needed for each address, - then we can know both length and opcodes of instructions. - For reason(s) above, we will pass to our caller a 'broken' instruction - of these major components, from which our caller can generate instructions: - - displacement length I^ S^ L^ B^ W^ unspecified - - mode (many) - - register R0-R15 or absent - - index register R0-R15 or absent - - expression text what we don't parse - - error text(s) why we couldn't understand the operand - - ---- - - To decode output of this, test errtxt. If errtxt[0] == '\0', then - we had no errors that prevented parsing. Also, if we ever report - an internal bug, errtxt[0] is set non-zero. So one test tells you - if the other outputs are to be taken seriously. - - ---- - - Dec defines the semantics of address modes (and values) - by a two-letter code, explained here. - - letter 1: access type - - a address calculation - no data access, registers forbidden - b branch displacement - m read - let go of bus - write back "modify" - r read - v bit field address: like 'a' but registers are OK - w write - space no operator (eg ".long foo") [our convention] - - letter 2: data type (i.e. width, alignment) - - b byte - d double precision floating point (D format) - f single precision floating point (F format) - g G format floating - h H format floating - l longword - o octaword - q quadword - w word - ? simple synthetic branch operand - - unconditional synthetic JSB/JSR operand - ! complex synthetic branch operand - - The '-?!' letter 2's are not for external consumption. They are used - for various assemblers. Generally, all unknown widths are assumed 0. - We don't limit your choice of width character. - - DEC operands are hard work to parse. For example, '@' as the first - character means indirect (deferred) mode but elsewhere it is a shift - operator. - The long-winded explanation of how this is supposed to work is - cancelled. Read a DEC vax manual. - We try hard not to parse anything that MIGHT be part of the expression - buried in that syntax. For example if we see @...(Rn) we don't check - for '-' before the '(' because mode @-(Rn) does not exist. - - After parsing we have: - - at 1 if leading '@' (or Un*x '*') - len takes one value from " bilsw". eg B^ -> 'b'. - hash 1 if leading '#' (or Un*x '$') - expr_begin, expr_end the expression we did not parse - even though we don't interpret it, we make use - of its presence or absence. - sign -1: -(Rn) 0: absent +1: (Rn)+ - paren 1 if () are around register - reg major register number 0:15 -1 means absent - ndx index register number 0:15 -1 means absent - - Again, I dare not explain it: just trace ALL the code! - - Summary of vip_op outputs. - - mode reg len ndx - (Rn) => @Rn - {@}Rn 5+@ n ' ' optional - branch operand 0 -1 ' ' -1 - S^#foo 0 -1 's' -1 - -(Rn) 7 n ' ' optional - {@}(Rn)+ 8+@ n ' ' optional - {@}#foo, no S^ 8+@ PC " i" optional - {@}{q^}{(Rn)} 10+@+q option " bwl" optional */ - -/* Dissect user-input 'optext' (which is something like "@B^foo@bar(AP)[FP]:") - using the vop in vopP. vopP's vop_access and vop_width. We fill _ndx, _reg, - _mode, _short, _warn, _error, _expr_begin, _expr_end and _nbytes. */ - -static void -vip_op (char *optext, struct vop *vopP) -{ - /* Track operand text forward. */ - char *p; - /* Track operand text backward. */ - char *q; - /* 1 if leading '@' ('*') seen. */ - int at; - /* one of " bilsw" */ - char len; - /* 1 if leading '#' ('$') seen. */ - int hash; - /* -1, 0 or +1. */ - int sign = 0; - /* 1 if () surround register. */ - int paren = 0; - /* Register number, -1:absent. */ - int reg = 0; - /* Index register number -1:absent. */ - int ndx = 0; - /* Report illegal operand, ""==OK. */ - /* " " is a FAKE error: means we won. */ - /* ANY err that begins with ' ' is a fake. */ - /* " " is converted to "" before return. */ - const char *err; - /* Warn about weird modes pf address. */ - const char *wrn; - /* Preserve q in case we backup. */ - char *oldq = NULL; - /* Build up 4-bit operand mode here. */ - /* Note: index mode is in ndx, this is. */ - /* The major mode of operand address. */ - int mode = 0; - /* Notice how we move wrong-arg-type bugs INSIDE this module: if we - get the types wrong below, we lose at compile time rather than at - lint or run time. */ - char access_mode; /* vop_access. */ - - access_mode = vopP->vop_access; - /* None of our code bugs (yet), no user text errors, no warnings - even. */ - err = wrn = 0; - - p = optext; - - if (*p == ' ') /* Expect all whitespace reduced to ' '. */ - p++; /* skip over whitespace */ - - if ((at = INDIRECTP (*p)) != 0) - { /* 1 if *p=='@'(or '*' for Un*x) */ - p++; /* at is determined */ - if (*p == ' ') /* Expect all whitespace reduced to ' '. */ - p++; /* skip over whitespace */ - } - - /* This code is subtle. It tries to detect all legal (letter)'^' - but it doesn't waste time explicitly testing for premature '\0' because - this case is rejected as a mismatch against either (letter) or '^'. */ - { - char c; - - c = *p; - c = TOLOWER (c); - if (DISPLENP (p[1]) && strchr ("bilws", len = c)) - p += 2; /* Skip (letter) '^'. */ - else /* No (letter) '^' seen. */ - len = ' '; /* Len is determined. */ - } - - if (*p == ' ') /* Expect all whitespace reduced to ' '. */ - p++; - - if ((hash = IMMEDIATEP (*p)) != 0) /* 1 if *p=='#' ('$' for Un*x) */ - p++; /* Hash is determined. */ - - /* p points to what may be the beginning of an expression. - We have peeled off the front all that is peelable. - We know at, len, hash. - - Lets point q at the end of the text and parse that (backwards). */ - - for (q = p; *q; q++) - ; - q--; /* Now q points at last char of text. */ - - if (*q == ' ' && q >= p) /* Expect all whitespace reduced to ' '. */ - q--; - - /* Reverse over whitespace, but don't. */ - /* Run back over *p. */ - - /* As a matter of policy here, we look for [Rn], although both Rn and S^# - forbid [Rn]. This is because it is easy, and because only a sick - cyborg would have [...] trailing an expression in a VAX-like assembler. - A meticulous parser would first check for Rn followed by '(' or '[' - and not parse a trailing ']' if it found another. We just ban expressions - ending in ']'. */ - if (*q == ']') - { - while (q >= p && *q != '[') - q--; - /* Either q<p or we got matching '['. */ - if (q < p) - err = _("no '[' to match ']'"); - else - { - /* Confusers like "[]" will eventually lose with a bad register - * name error. So again we don't need to check for early '\0'. */ - if (q[3] == ']') - ndx = vax_reg_parse (q[1], q[2], 0, 0); - else if (q[4] == ']') - ndx = vax_reg_parse (q[1], q[2], q[3], 0); - else if (q[5] == ']') - ndx = vax_reg_parse (q[1], q[2], q[3], q[4]); - else - ndx = -1; - /* Since we saw a ']' we will demand a register name in the []. - * If luser hasn't given us one: be rude. */ - if (ndx < 0) - err = _("bad register in []"); - else if (ndx == PC) - err = _("[PC] index banned"); - else - /* Point q just before "[...]". */ - q--; - } - } - else - /* No ']', so no iNDeX register. */ - ndx = -1; - - /* If err = "..." then we lost: run away. - Otherwise ndx == -1 if there was no "[...]". - Otherwise, ndx is index register number, and q points before "[...]". */ - - if (*q == ' ' && q >= p) /* Expect all whitespace reduced to ' '. */ - q--; - /* Reverse over whitespace, but don't. */ - /* Run back over *p. */ - if (!err || !*err) - { - /* no ()+ or -() seen yet */ - sign = 0; - - if (q > p + 3 && *q == '+' && q[-1] == ')') - { - sign = 1; /* we saw a ")+" */ - q--; /* q points to ')' */ - } - - if (*q == ')' && q > p + 2) - { - paren = 1; /* assume we have "(...)" */ - while (q >= p && *q != '(') - q--; - /* either q<p or we got matching '(' */ - if (q < p) - err = _("no '(' to match ')'"); - else - { - /* Confusers like "()" will eventually lose with a bad register - name error. So again we don't need to check for early '\0'. */ - if (q[3] == ')') - reg = vax_reg_parse (q[1], q[2], 0, 0); - else if (q[4] == ')') - reg = vax_reg_parse (q[1], q[2], q[3], 0); - else if (q[5] == ')') - reg = vax_reg_parse (q[1], q[2], q[3], q[4]); - else - reg = -1; - /* Since we saw a ')' we will demand a register name in the ')'. - This is nasty: why can't our hypothetical assembler permit - parenthesised expressions? BECAUSE I AM LAZY! That is why. - Abuse luser if we didn't spy a register name. */ - if (reg < 0) - { - /* JF allow parenthesized expressions. I hope this works. */ - paren = 0; - while (*q != ')') - q++; - /* err = "unknown register in ()"; */ - } - else - q--; /* point just before '(' of "(...)" */ - /* If err == "..." then we lost. Run away. - Otherwise if reg >= 0 then we saw (Rn). */ - } - /* If err == "..." then we lost. - Otherwise paren==1 and reg = register in "()". */ - } - else - paren = 0; - /* If err == "..." then we lost. - Otherwise, q points just before "(Rn)", if any. - If there was a "(...)" then paren==1, and reg is the register. */ - - /* We should only seek '-' of "-(...)" if: - we saw "(...)" paren == 1 - we have no errors so far ! *err - we did not see '+' of "(...)+" sign < 1 - We don't check len. We want a specific error message later if - user tries "x^...-(Rn)". This is a feature not a bug. */ - if (!err || !*err) - { - if (paren && sign < 1)/* !sign is adequate test */ - { - if (*q == '-') - { - sign = -1; - q--; - } - } - /* We have back-tracked over most - of the crud at the end of an operand. - Unless err, we know: sign, paren. If paren, we know reg. - The last case is of an expression "Rn". - This is worth hunting for if !err, !paren. - We wouldn't be here if err. - We remember to save q, in case we didn't want "Rn" anyway. */ - if (!paren) - { - if (*q == ' ' && q >= p) /* Expect all whitespace reduced to ' '. */ - q--; - /* Reverse over whitespace, but don't. */ - /* Run back over *p. */ - /* Room for Rn or Rnn (include prefix) exactly? */ - if (q > p && q < p + 4) - reg = vax_reg_parse (p[0], p[1], - q < p + 2 ? 0 : p[2], - q < p + 3 ? 0 : p[3]); - else - reg = -1; /* Always comes here if no register at all. */ - /* Here with a definitive reg value. */ - if (reg >= 0) - { - oldq = q; - q = p - 1; - } - } - } - } - /* have reg. -1:absent; else 0:15. */ - - /* We have: err, at, len, hash, ndx, sign, paren, reg. - Also, any remaining expression is from *p through *q inclusive. - Should there be no expression, q==p-1. So expression length = q-p+1. - This completes the first part: parsing the operand text. */ - - /* We now want to boil the data down, checking consistency on the way. - We want: len, mode, reg, ndx, err, p, q, wrn, bug. - We will deliver a 4-bit reg, and a 4-bit mode. */ - - /* Case of branch operand. Different. No L^B^W^I^S^ allowed for instance. - - in: at ? - len ? - hash ? - p:q ? - sign ? - paren ? - reg ? - ndx ? - - out: mode 0 - reg -1 - len ' ' - p:q whatever was input - ndx -1 - err " " or error message, and other outputs trashed. */ - /* Branch operands have restricted forms. */ - if ((!err || !*err) && access_mode == 'b') - { - if (at || hash || sign || paren || ndx >= 0 || reg >= 0 || len != ' ') - err = _("invalid branch operand"); - else - err = " "; - } - - /* Since nobody seems to use it: comment this 'feature'(?) out for now. */ -#ifdef NEVER - /* Case of stand-alone operand. e.g. ".long foo" - - in: at ? - len ? - hash ? - p:q ? - sign ? - paren ? - reg ? - ndx ? - - out: mode 0 - reg -1 - len ' ' - p:q whatever was input - ndx -1 - err " " or error message, and other outputs trashed. */ - if ((!err || !*err) && access_mode == ' ') - { - if (at) - err = _("address prohibits @"); - else if (hash) - err = _("address prohibits #"); - else if (sign) - { - if (sign < 0) - err = _("address prohibits -()"); - else - err = _("address prohibits ()+"); - } - else if (paren) - err = _("address prohibits ()"); - else if (ndx >= 0) - err = _("address prohibits []"); - else if (reg >= 0) - err = _("address prohibits register"); - else if (len != ' ') - err = _("address prohibits displacement length specifier"); - else - { - err = " "; /* succeed */ - mode = 0; - } - } -#endif - - /* Case of S^#. - - in: at 0 - len 's' definition - hash 1 demand - p:q demand not empty - sign 0 by paren==0 - paren 0 by "()" scan logic because "S^" seen - reg -1 or nn by mistake - ndx -1 - - out: mode 0 - reg -1 - len 's' - exp - ndx -1 */ - if ((!err || !*err) && len == 's') - { - if (!hash || paren || at || ndx >= 0) - err = _("invalid operand of S^#"); - else - { - if (reg >= 0) - { - /* Darn! we saw S^#Rnn ! put the Rnn back in - expression. KLUDGE! Use oldq so we don't - need to know exact length of reg name. */ - q = oldq; - reg = 0; - } - /* We have all the expression we will ever get. */ - if (p > q) - err = _("S^# needs expression"); - else if (access_mode == 'r') - { - err = " "; /* WIN! */ - mode = 0; - } - else - err = _("S^# may only read-access"); - } - } - - /* Case of -(Rn), which is weird case. - - in: at 0 - len ' - hash 0 - p:q q<p - sign -1 by definition - paren 1 by definition - reg present by definition - ndx optional - - out: mode 7 - reg present - len ' ' - exp "" enforce empty expression - ndx optional warn if same as reg. */ - if ((!err || !*err) && sign < 0) - { - if (len != ' ' || hash || at || p <= q) - err = _("invalid operand of -()"); - else - { - err = " "; /* win */ - mode = 7; - if (reg == PC) - wrn = _("-(PC) unpredictable"); - else if (reg == ndx) - wrn = _("[]index same as -()register: unpredictable"); - } - } - - /* We convert "(Rn)" to "@Rn" for our convenience. - (I hope this is convenient: has someone got a better way to parse this?) - A side-effect of this is that "@Rn" is a valid operand. */ - if (paren && !sign && !hash && !at && len == ' ' && p > q) - { - at = 1; - paren = 0; - } - - /* Case of (Rn)+, which is slightly different. - - in: at - len ' ' - hash 0 - p:q q<p - sign +1 by definition - paren 1 by definition - reg present by definition - ndx optional - - out: mode 8+@ - reg present - len ' ' - exp "" enforce empty expression - ndx optional warn if same as reg. */ - if ((!err || !*err) && sign > 0) - { - if (len != ' ' || hash || p <= q) - err = _("invalid operand of ()+"); - else - { - err = " "; /* win */ - mode = 8 + (at ? 1 : 0); - if (reg == PC) - wrn = _("(PC)+ unpredictable"); - else if (reg == ndx) - wrn = _("[]index same as ()+register: unpredictable"); - } - } - - /* Case of #, without S^. - - in: at - len ' ' or 'i' - hash 1 by definition - p:q - sign 0 - paren 0 - reg absent - ndx optional - - out: mode 8+@ - reg PC - len ' ' or 'i' - exp - ndx optional. */ - if ((!err || !*err) && hash) - { - if (len != 'i' && len != ' ') - err = _("# conflicts length"); - else if (paren) - err = _("# bars register"); - else - { - if (reg >= 0) - { - /* Darn! we saw #Rnn! Put the Rnn back into the expression. - By using oldq, we don't need to know how long Rnn was. - KLUDGE! */ - q = oldq; - reg = -1; /* No register any more. */ - } - err = " "; /* Win. */ - - /* JF a bugfix, I think! */ - if (at && access_mode == 'a') - vopP->vop_nbytes = 4; - - mode = (at ? 9 : 8); - reg = PC; - if ((access_mode == 'm' || access_mode == 'w') && !at) - wrn = _("writing or modifying # is unpredictable"); - } - } - /* If !*err, then sign == 0 - hash == 0 */ - - /* Case of Rn. We separate this one because it has a few special - errors the remaining modes lack. - - in: at optional - len ' ' - hash 0 by program logic - p:q empty - sign 0 by program logic - paren 0 by definition - reg present by definition - ndx optional - - out: mode 5+@ - reg present - len ' ' enforce no length - exp "" enforce empty expression - ndx optional warn if same as reg. */ - if ((!err || !*err) && !paren && reg >= 0) - { - if (len != ' ') - err = _("length not needed"); - else if (at) - { - err = " "; /* win */ - mode = 6; /* @Rn */ - } - else if (ndx >= 0) - err = _("can't []index a register, because it has no address"); - else if (access_mode == 'a') - err = _("a register has no address"); - else - { - /* Idea here is to detect from length of datum - and from register number if we will touch PC. - Warn if we do. - vop_nbytes is number of bytes in operand. - Compute highest byte affected, compare to PC0. */ - if ((vopP->vop_nbytes + reg * 4) > 60) - wrn = _("PC part of operand unpredictable"); - err = " "; /* win */ - mode = 5; /* Rn */ - } - } - /* If !*err, sign == 0 - hash == 0 - paren == 1 OR reg==-1 */ - - /* Rest of cases fit into one bunch. - - in: at optional - len ' ' or 'b' or 'w' or 'l' - hash 0 by program logic - p:q expected (empty is not an error) - sign 0 by program logic - paren optional - reg optional - ndx optional - - out: mode 10 + @ + len - reg optional - len ' ' or 'b' or 'w' or 'l' - exp maybe empty - ndx optional warn if same as reg. */ - if (!err || !*err) - { - err = " "; /* win (always) */ - mode = 10 + (at ? 1 : 0); - switch (len) - { - case 'l': - mode += 2; - case 'w': - mode += 2; - case ' ': /* Assumed B^ until our caller changes it. */ - case 'b': - break; - } - } - - /* here with completely specified mode - len - reg - expression p,q - ndx. */ - - if (*err == ' ') - err = 0; /* " " is no longer an error. */ - - vopP->vop_mode = mode; - vopP->vop_reg = reg; - vopP->vop_short = len; - vopP->vop_expr_begin = p; - vopP->vop_expr_end = q; - vopP->vop_ndx = ndx; - vopP->vop_error = err; - vopP->vop_warn = wrn; -} - -/* This converts a string into a vax instruction. - The string must be a bare single instruction in dec-vax (with BSD4 frobs) - format. - It provides some error messages: at most one fatal error message (which - stops the scan) and at most one warning message for each operand. - The vax instruction is returned in exploded form, since we have no - knowledge of how you parse (or evaluate) your expressions. - We do however strip off and decode addressing modes and operation - mnemonic. - - The exploded instruction is returned to a struct vit of your choice. - #include "vax-inst.h" to know what a struct vit is. - - This function's value is a string. If it is not "" then an internal - logic error was found: read this code to assign meaning to the string. - No argument string should generate such an error string: - it means a bug in our code, not in the user's text. - - You MUST have called vip_begin() once before using this function. */ - -static void -vip (struct vit *vitP, /* We build an exploded instruction here. */ - char *instring) /* Text of a vax instruction: we modify. */ -{ - /* How to bit-encode this opcode. */ - struct vot_wot *vwP; - /* 1/skip whitespace.2/scan vot_how */ - char *p; - char *q; - /* counts number of operands seen */ - unsigned char count; - /* scan operands in struct vit */ - struct vop *operandp; - /* error over all operands */ - const char *alloperr; - /* Remember char, (we clobber it with '\0' temporarily). */ - char c; - /* Op-code of this instruction. */ - vax_opcodeT oc; - - if (*instring == ' ') - ++instring; - - /* MUST end in end-of-string or exactly 1 space. */ - for (p = instring; *p && *p != ' '; p++) - ; - - /* Scanned up to end of operation-code. */ - /* Operation-code is ended with whitespace. */ - if (p - instring == 0) - { - vitP->vit_error = _("No operator"); - count = 0; - memset (vitP->vit_opcode, '\0', sizeof (vitP->vit_opcode)); - } - else - { - c = *p; - *p = '\0'; - /* Here with instring pointing to what better be an op-name, and p - pointing to character just past that. - We trust instring points to an op-name, with no whitespace. */ - vwP = (struct vot_wot *) hash_find (op_hash, instring); - /* Restore char after op-code. */ - *p = c; - if (vwP == 0) - { - vitP->vit_error = _("Unknown operator"); - count = 0; - memset (vitP->vit_opcode, '\0', sizeof (vitP->vit_opcode)); - } - else - { - /* We found a match! So let's pick up as many operands as the - instruction wants, and even gripe if there are too many. - We expect comma to separate each operand. - We let instring track the text, while p tracks a part of the - struct vot. */ - const char *howp; - /* The lines below know about 2-byte opcodes starting FD,FE or FF. - They also understand synthetic opcodes. Note: - we return 32 bits of opcode, including bucky bits, BUT - an opcode length is either 8 or 16 bits for vit_opcode_nbytes. */ - oc = vwP->vot_code; /* The op-code. */ - vitP->vit_opcode_nbytes = (oc & 0xFF) >= 0xFD ? 2 : 1; - md_number_to_chars (vitP->vit_opcode, oc, 4); - count = 0; /* No operands seen yet. */ - instring = p; /* Point just past operation code. */ - alloperr = ""; - for (howp = vwP->vot_how, operandp = vitP->vit_operand; - !(alloperr && *alloperr) && *howp; - operandp++, howp += 2) - { - /* Here to parse one operand. Leave instring pointing just - past any one ',' that marks the end of this operand. */ - if (!howp[1]) - as_fatal (_("odd number of bytes in operand description")); - else if (*instring) - { - for (q = instring; (c = *q) && c != ','; q++) - ; - /* Q points to ',' or '\0' that ends argument. C is that - character. */ - *q = 0; - operandp->vop_width = howp[1]; - operandp->vop_nbytes = vax_operand_width_size[(unsigned) howp[1]]; - operandp->vop_access = howp[0]; - vip_op (instring, operandp); - *q = c; /* Restore input text. */ - if (operandp->vop_error) - alloperr = _("Bad operand"); - instring = q + (c ? 1 : 0); /* Next operand (if any). */ - count++; /* Won another argument, may have an operr. */ - } - else - alloperr = _("Not enough operands"); - } - if (!*alloperr) - { - if (*instring == ' ') - instring++; - if (*instring) - alloperr = _("Too many operands"); - } - vitP->vit_error = alloperr; - } - } - vitP->vit_operands = count; -} - -#ifdef test - -/* Test program for above. */ - -struct vit myvit; /* Build an exploded vax instruction here. */ -char answer[100]; /* Human types a line of vax assembler here. */ -char *mybug; /* "" or an internal logic diagnostic. */ -int mycount; /* Number of operands. */ -struct vop *myvop; /* Scan operands from myvit. */ -int mysynth; /* 1 means want synthetic opcodes. */ -char my_immediate[200]; -char my_indirect[200]; -char my_displen[200]; - -int -main (void) -{ - char *p; - - printf ("0 means no synthetic instructions. "); - printf ("Value for vip_begin? "); - gets (answer); - sscanf (answer, "%d", &mysynth); - printf ("Synthetic opcodes %s be included.\n", mysynth ? "will" : "will not"); - printf ("enter immediate symbols eg enter # "); - gets (my_immediate); - printf ("enter indirect symbols eg enter @ "); - gets (my_indirect); - printf ("enter displen symbols eg enter ^ "); - gets (my_displen); - - if (p = vip_begin (mysynth, my_immediate, my_indirect, my_displen)) - error ("vip_begin=%s", p); - - printf ("An empty input line will quit you from the vax instruction parser\n"); - for (;;) - { - printf ("vax instruction: "); - fflush (stdout); - gets (answer); - if (!*answer) - break; /* Out of for each input text loop. */ - - vip (& myvit, answer); - if (*myvit.vit_error) - printf ("ERR:\"%s\"\n", myvit.vit_error); - - printf ("opcode="); - for (mycount = myvit.vit_opcode_nbytes, p = myvit.vit_opcode; - mycount; - mycount--, p++) - printf ("%02x ", *p & 0xFF); - - printf (" operand count=%d.\n", mycount = myvit.vit_operands); - for (myvop = myvit.vit_operand; mycount; mycount--, myvop++) - { - printf ("mode=%xx reg=%xx ndx=%xx len='%c'=%c%c%d. expr=\"", - myvop->vop_mode, myvop->vop_reg, myvop->vop_ndx, - myvop->vop_short, myvop->vop_access, myvop->vop_width, - myvop->vop_nbytes); - for (p = myvop->vop_expr_begin; p <= myvop->vop_expr_end; p++) - putchar (*p); - - printf ("\"\n"); - if (myvop->vop_error) - printf (" err:\"%s\"\n", myvop->vop_error); - - if (myvop->vop_warn) - printf (" wrn:\"%s\"\n", myvop->vop_warn); - } - } - vip_end (); - exit (EXIT_SUCCESS); -} - -#endif - -#ifdef TEST /* #Define to use this testbed. */ - -/* Follows a test program for this function. - We declare arrays non-local in case some of our tiny-minded machines - default to small stacks. Also, helps with some debuggers. */ - -char answer[100]; /* Human types into here. */ -char *p; /* */ -char *myerr; -char *mywrn; -char *mybug; -char myaccess; -char mywidth; -char mymode; -char myreg; -char mylen; -char *myleft; -char *myright; -char myndx; -int my_operand_length; -char my_immediate[200]; -char my_indirect[200]; -char my_displen[200]; - -int -main (void) -{ - printf ("enter immediate symbols eg enter # "); - gets (my_immediate); - printf ("enter indirect symbols eg enter @ "); - gets (my_indirect); - printf ("enter displen symbols eg enter ^ "); - gets (my_displen); - vip_op_defaults (my_immediate, my_indirect, my_displen); - - for (;;) - { - printf ("access,width (eg 'ab' or 'wh') [empty line to quit] : "); - fflush (stdout); - gets (answer); - if (!answer[0]) - exit (EXIT_SUCCESS); - myaccess = answer[0]; - mywidth = answer[1]; - switch (mywidth) - { - case 'b': - my_operand_length = 1; - break; - case 'd': - my_operand_length = 8; - break; - case 'f': - my_operand_length = 4; - break; - case 'g': - my_operand_length = 16; - break; - case 'h': - my_operand_length = 32; - break; - case 'l': - my_operand_length = 4; - break; - case 'o': - my_operand_length = 16; - break; - case 'q': - my_operand_length = 8; - break; - case 'w': - my_operand_length = 2; - break; - case '!': - case '?': - case '-': - my_operand_length = 0; - break; - - default: - my_operand_length = 2; - printf ("I dn't understand access width %c\n", mywidth); - break; - } - printf ("VAX assembler instruction operand: "); - fflush (stdout); - gets (answer); - mybug = vip_op (answer, myaccess, mywidth, my_operand_length, - &mymode, &myreg, &mylen, &myleft, &myright, &myndx, - &myerr, &mywrn); - if (*myerr) - { - printf ("error: \"%s\"\n", myerr); - if (*mybug) - printf (" bug: \"%s\"\n", mybug); - } - else - { - if (*mywrn) - printf ("warning: \"%s\"\n", mywrn); - mumble ("mode", mymode); - mumble ("register", myreg); - mumble ("index", myndx); - printf ("width:'%c' ", mylen); - printf ("expression: \""); - while (myleft <= myright) - putchar (*myleft++); - printf ("\"\n"); - } - } -} - -void -mumble (char *text, int value) -{ - printf ("%s:", text); - if (value >= 0) - printf ("%xx", value); - else - printf ("ABSENT"); - printf (" "); -} - -#endif - -int md_short_jump_size = 3; -int md_long_jump_size = 6; - -void -md_create_short_jump (char *ptr, - addressT from_addr, - addressT to_addr ATTRIBUTE_UNUSED, - fragS *frag ATTRIBUTE_UNUSED, - symbolS *to_symbol ATTRIBUTE_UNUSED) -{ - valueT offset; - - /* This former calculation was off by two: - offset = to_addr - (from_addr + 1); - We need to account for the one byte instruction and also its - two byte operand. */ - offset = to_addr - (from_addr + 1 + 2); - *ptr++ = VAX_BRW; /* Branch with word (16 bit) offset. */ - md_number_to_chars (ptr, offset, 2); -} - -void -md_create_long_jump (char *ptr, - addressT from_addr ATTRIBUTE_UNUSED, - addressT to_addr, - fragS *frag, - symbolS *to_symbol) -{ - valueT offset; - - offset = to_addr - S_GET_VALUE (to_symbol); - *ptr++ = VAX_JMP; /* Arbitrary jump. */ - *ptr++ = VAX_ABSOLUTE_MODE; - md_number_to_chars (ptr, offset, 4); - fix_new (frag, ptr - frag->fr_literal, 4, to_symbol, (long) 0, 0, NO_RELOC); -} - -#ifdef OBJ_VMS -const char *md_shortopts = "d:STt:V+1h:Hv::"; -#elif defined(OBJ_ELF) -const char *md_shortopts = "d:STt:VkKQ:"; -#else -const char *md_shortopts = "d:STt:V"; -#endif -struct option md_longopts[] = -{ -#ifdef OBJ_ELF -#define OPTION_PIC (OPTION_MD_BASE) - { "pic", no_argument, NULL, OPTION_PIC }, -#endif - { NULL, no_argument, NULL, 0 } -}; -size_t md_longopts_size = sizeof (md_longopts); - -int -md_parse_option (int c, char *arg) -{ - switch (c) - { - case 'S': - as_warn (_("SYMBOL TABLE not implemented")); - break; - - case 'T': - as_warn (_("TOKEN TRACE not implemented")); - break; - - case 'd': - as_warn (_("Displacement length %s ignored!"), arg); - break; - - case 't': - as_warn (_("I don't need or use temp. file \"%s\"."), arg); - break; - - case 'V': - as_warn (_("I don't use an interpass file! -V ignored")); - break; - -#ifdef OBJ_VMS - case '+': /* For g++. Hash any name > 31 chars long. */ - flag_hash_long_names = 1; - break; - - case '1': /* For backward compatibility. */ - flag_one = 1; - break; - - case 'H': /* Show new symbol after hash truncation. */ - flag_show_after_trunc = 1; - break; - - case 'h': /* No hashing of mixed-case names. */ - { - extern char vms_name_mapping; - vms_name_mapping = atoi (arg); - flag_no_hash_mixed_case = 1; - } - break; - - case 'v': - { - extern char *compiler_version_string; - - if (!arg || !*arg || access (arg, 0) == 0) - return 0; /* Have caller show the assembler version. */ - compiler_version_string = arg; - } - break; -#endif - -#ifdef OBJ_ELF - case OPTION_PIC: - case 'k': - flag_want_pic = 1; - break; /* -pic, Position Independent Code. */ - - /* -Qy, -Qn: SVR4 arguments controlling whether a .comment - section should be emitted or not. FIXME: Not implemented. */ - case 'Q': - break; -#endif - - default: - return 0; - } - - return 1; -} - -void -md_show_usage (FILE *stream) -{ - fprintf (stream, _("\ -VAX options:\n\ --d LENGTH ignored\n\ --J ignored\n\ --S ignored\n\ --t FILE ignored\n\ --T ignored\n\ --V ignored\n")); -#ifdef OBJ_VMS - fprintf (stream, _("\ -VMS options:\n\ --+ hash encode names longer than 31 characters\n\ --1 `const' handling compatible with gcc 1.x\n\ --H show new symbol after hash truncation\n\ --h NUM don't hash mixed-case names, and adjust case:\n\ - 0 = upper, 2 = lower, 3 = preserve case\n\ --v\"VERSION\" code being assembled was produced by compiler \"VERSION\"\n")); -#endif -} - -/* We have no need to default values of symbols. */ - -symbolS * -md_undefined_symbol (char *name ATTRIBUTE_UNUSED) -{ - return NULL; -} - -/* Round up a section size to the appropriate boundary. */ -valueT -md_section_align (segT segment ATTRIBUTE_UNUSED, valueT size) -{ - /* Byte alignment is fine */ - return size; -} - -/* Exactly what point is a PC-relative offset relative TO? - On the vax, they're relative to the address of the offset, plus - its size. */ -long -md_pcrel_from (fixS *fixP) -{ - return fixP->fx_size + fixP->fx_where + fixP->fx_frag->fr_address; -} - -arelent * -tc_gen_reloc (asection *section ATTRIBUTE_UNUSED, fixS *fixp) -{ - arelent *reloc; - bfd_reloc_code_real_type code; - - if (fixp->fx_tcbit) - abort (); - - if (fixp->fx_r_type != BFD_RELOC_NONE) - { - code = fixp->fx_r_type; - - if (fixp->fx_pcrel) - { - switch (code) - { - case BFD_RELOC_8_PCREL: - case BFD_RELOC_16_PCREL: - case BFD_RELOC_32_PCREL: -#ifdef OBJ_ELF - case BFD_RELOC_8_GOT_PCREL: - case BFD_RELOC_16_GOT_PCREL: - case BFD_RELOC_32_GOT_PCREL: - case BFD_RELOC_8_PLT_PCREL: - case BFD_RELOC_16_PLT_PCREL: - case BFD_RELOC_32_PLT_PCREL: -#endif - break; - default: - as_bad_where (fixp->fx_file, fixp->fx_line, - _("Cannot make %s relocation PC relative"), - bfd_get_reloc_code_name (code)); - } - } - } - else - { -#define F(SZ,PCREL) (((SZ) << 1) + (PCREL)) - switch (F (fixp->fx_size, fixp->fx_pcrel)) - { -#define MAP(SZ,PCREL,TYPE) case F(SZ,PCREL): code = (TYPE); break - MAP (1, 0, BFD_RELOC_8); - MAP (2, 0, BFD_RELOC_16); - MAP (4, 0, BFD_RELOC_32); - MAP (1, 1, BFD_RELOC_8_PCREL); - MAP (2, 1, BFD_RELOC_16_PCREL); - MAP (4, 1, BFD_RELOC_32_PCREL); - default: - abort (); - } - } -#undef F -#undef MAP - - reloc = xmalloc (sizeof (arelent)); - reloc->sym_ptr_ptr = xmalloc (sizeof (asymbol *)); - *reloc->sym_ptr_ptr = symbol_get_bfdsym (fixp->fx_addsy); - reloc->address = fixp->fx_frag->fr_address + fixp->fx_where; -#ifndef OBJ_ELF - if (fixp->fx_pcrel) - reloc->addend = fixp->fx_addnumber; - else - reloc->addend = 0; -#else - reloc->addend = fixp->fx_offset; -#endif - - reloc->howto = bfd_reloc_type_lookup (stdoutput, code); - gas_assert (reloc->howto != 0); - - return reloc; -} - -/* vax:md_assemble() emit frags for 1 instruction given in textual form. */ -void -md_assemble (char *instruction_string) -{ - /* Non-zero if operand expression's segment is not known yet. */ - int is_undefined; - /* Non-zero if operand expression's segment is absolute. */ - int is_absolute; - int length_code; - char *p; - /* An operand. Scans all operands. */ - struct vop *operandP; - char *save_input_line_pointer; - /* What used to live after an expression. */ - char c_save; - /* 1: instruction_string bad for all passes. */ - int goofed; - /* Points to slot just after last operand. */ - struct vop *end_operandP; - /* Points to expression values for this operand. */ - expressionS *expP; - segT *segP; - - /* These refer to an instruction operand expression. */ - /* Target segment of the address. */ - segT to_seg; - valueT this_add_number; - /* Positive (minuend) symbol. */ - symbolS *this_add_symbol; - /* As a number. */ - long opcode_as_number; - /* Least significant byte 1st. */ - char *opcode_as_chars; - /* As an array of characters. */ - /* Least significant byte 1st */ - char *opcode_low_byteP; - /* length (bytes) meant by vop_short. */ - int length; - /* 0, or 1 if '@' is in addressing mode. */ - int at; - /* From vop_nbytes: vax_operand_width (in bytes) */ - int nbytes; - FLONUM_TYPE *floatP; - LITTLENUM_TYPE literal_float[8]; - /* Big enough for any floating point literal. */ - - vip (&v, instruction_string); - - /* Now we try to find as many as_warn()s as we can. If we do any as_warn()s - then goofed=1. Notice that we don't make any frags yet. - Should goofed be 1, then this instruction will wedge in any pass, - and we can safely flush it, without causing interpass symbol phase - errors. That is, without changing label values in different passes. */ - if ((goofed = (*v.vit_error)) != 0) - { - as_fatal (_("Ignoring statement due to \"%s\""), v.vit_error); - } - /* We need to use expression() and friends, which require us to diddle - input_line_pointer. So we save it and restore it later. */ - save_input_line_pointer = input_line_pointer; - for (operandP = v.vit_operand, - expP = exp_of_operand, - segP = seg_of_operand, - floatP = float_operand, - end_operandP = v.vit_operand + v.vit_operands; - - operandP < end_operandP; - - operandP++, expP++, segP++, floatP++) - { - if (operandP->vop_error) - { - as_fatal (_("Aborting because statement has \"%s\""), operandP->vop_error); - goofed = 1; - } - else - { - /* Statement has no syntax goofs: let's sniff the expression. */ - int can_be_short = 0; /* 1 if a bignum can be reduced to a short literal. */ - - input_line_pointer = operandP->vop_expr_begin; - c_save = operandP->vop_expr_end[1]; - operandP->vop_expr_end[1] = '\0'; - /* If to_seg == SEG_PASS1, expression() will have set need_pass_2 = 1. */ - *segP = expression (expP); - switch (expP->X_op) - { - case O_absent: - /* for BSD4.2 compatibility, missing expression is absolute 0 */ - expP->X_op = O_constant; - expP->X_add_number = 0; - /* For SEG_ABSOLUTE, we shouldn't need to set X_op_symbol, - X_add_symbol to any particular value. But, we will program - defensively. Since this situation occurs rarely so it costs - us little to do, and stops Dean worrying about the origin of - random bits in expressionS's. */ - expP->X_add_symbol = NULL; - expP->X_op_symbol = NULL; - break; - - case O_symbol: - case O_constant: - break; - - default: - /* Major bug. We can't handle the case of a - SEG_OP expression in a VIT_OPCODE_SYNTHETIC - variable-length instruction. - We don't have a frag type that is smart enough to - relax a SEG_OP, and so we just force all - SEG_OPs to behave like SEG_PASS1s. - Clearly, if there is a demand we can invent a new or - modified frag type and then coding up a frag for this - case will be easy. SEG_OP was invented for the - .words after a CASE opcode, and was never intended for - instruction operands. */ - need_pass_2 = 1; - as_fatal (_("Can't relocate expression")); - break; - - case O_big: - /* Preserve the bits. */ - if (expP->X_add_number > 0) - { - bignum_copy (generic_bignum, expP->X_add_number, - floatP->low, SIZE_OF_LARGE_NUMBER); - } - else - { - know (expP->X_add_number < 0); - flonum_copy (&generic_floating_point_number, - floatP); - if (strchr ("s i", operandP->vop_short)) - { - /* Could possibly become S^# */ - flonum_gen2vax (-expP->X_add_number, floatP, literal_float); - switch (-expP->X_add_number) - { - case 'f': - can_be_short = - (literal_float[0] & 0xFC0F) == 0x4000 - && literal_float[1] == 0; - break; - - case 'd': - can_be_short = - (literal_float[0] & 0xFC0F) == 0x4000 - && literal_float[1] == 0 - && literal_float[2] == 0 - && literal_float[3] == 0; - break; - - case 'g': - can_be_short = - (literal_float[0] & 0xFF81) == 0x4000 - && literal_float[1] == 0 - && literal_float[2] == 0 - && literal_float[3] == 0; - break; - - case 'h': - can_be_short = ((literal_float[0] & 0xFFF8) == 0x4000 - && (literal_float[1] & 0xE000) == 0 - && literal_float[2] == 0 - && literal_float[3] == 0 - && literal_float[4] == 0 - && literal_float[5] == 0 - && literal_float[6] == 0 - && literal_float[7] == 0); - break; - - default: - BAD_CASE (-expP->X_add_number); - break; - } - } - } - - if (operandP->vop_short == 's' - || operandP->vop_short == 'i' - || (operandP->vop_short == ' ' - && operandP->vop_reg == 0xF - && (operandP->vop_mode & 0xE) == 0x8)) - { - /* Saw a '#'. */ - if (operandP->vop_short == ' ') - { - /* We must chose S^ or I^. */ - if (expP->X_add_number > 0) - { - /* Bignum: Short literal impossible. */ - operandP->vop_short = 'i'; - operandP->vop_mode = 8; - operandP->vop_reg = 0xF; /* VAX PC. */ - } - else - { - /* Flonum: Try to do it. */ - if (can_be_short) - { - operandP->vop_short = 's'; - operandP->vop_mode = 0; - operandP->vop_ndx = -1; - operandP->vop_reg = -1; - expP->X_op = O_constant; - } - else - { - operandP->vop_short = 'i'; - operandP->vop_mode = 8; - operandP->vop_reg = 0xF; /* VAX PC */ - } - } /* bignum or flonum ? */ - } /* if #, but no S^ or I^ seen. */ - /* No more ' ' case: either 's' or 'i'. */ - if (operandP->vop_short == 's') - { - /* Wants to be a short literal. */ - if (expP->X_add_number > 0) - { - as_warn (_("Bignum not permitted in short literal. Immediate mode assumed.")); - operandP->vop_short = 'i'; - operandP->vop_mode = 8; - operandP->vop_reg = 0xF; /* VAX PC. */ - } - else - { - if (!can_be_short) - { - as_warn (_("Can't do flonum short literal: immediate mode used.")); - operandP->vop_short = 'i'; - operandP->vop_mode = 8; - operandP->vop_reg = 0xF; /* VAX PC. */ - } - else - { - /* Encode short literal now. */ - int temp = 0; - - switch (-expP->X_add_number) - { - case 'f': - case 'd': - temp = literal_float[0] >> 4; - break; - - case 'g': - temp = literal_float[0] >> 1; - break; - - case 'h': - temp = ((literal_float[0] << 3) & 070) - | ((literal_float[1] >> 13) & 07); - break; - - default: - BAD_CASE (-expP->X_add_number); - break; - } - - floatP->low[0] = temp & 077; - floatP->low[1] = 0; - } - } - } - else - { - /* I^# seen: set it up if float. */ - if (expP->X_add_number < 0) - { - memcpy (floatP->low, literal_float, sizeof (literal_float)); - } - } /* if S^# seen. */ - } - else - { - as_warn (_("A bignum/flonum may not be a displacement: 0x%lx used"), - (expP->X_add_number = 0x80000000L)); - /* Chosen so luser gets the most offset bits to patch later. */ - } - expP->X_add_number = floatP->low[0] - | ((LITTLENUM_MASK & (floatP->low[1])) << LITTLENUM_NUMBER_OF_BITS); - - /* For the O_big case we have: - If vop_short == 's' then a short floating literal is in the - lowest 6 bits of floatP -> low [0], which is - big_operand_bits [---] [0]. - If vop_short == 'i' then the appropriate number of elements - of big_operand_bits [---] [...] are set up with the correct - bits. - Also, just in case width is byte word or long, we copy the lowest - 32 bits of the number to X_add_number. */ - break; - } - if (input_line_pointer != operandP->vop_expr_end + 1) - { - as_fatal ("Junk at end of expression \"%s\"", input_line_pointer); - goofed = 1; - } - operandP->vop_expr_end[1] = c_save; - } - } - - input_line_pointer = save_input_line_pointer; - - if (need_pass_2 || goofed) - return; - - dwarf2_emit_insn (0); - /* Emit op-code. */ - /* Remember where it is, in case we want to modify the op-code later. */ - opcode_low_byteP = frag_more (v.vit_opcode_nbytes); - memcpy (opcode_low_byteP, v.vit_opcode, v.vit_opcode_nbytes); - opcode_as_chars = v.vit_opcode; - opcode_as_number = md_chars_to_number ((unsigned char *) opcode_as_chars, 4); - for (operandP = v.vit_operand, - expP = exp_of_operand, - segP = seg_of_operand, - floatP = float_operand, - end_operandP = v.vit_operand + v.vit_operands; - - operandP < end_operandP; - - operandP++, - floatP++, - segP++, - expP++) - { - if (operandP->vop_ndx >= 0) - { - /* Indexed addressing byte. */ - /* Legality of indexed mode already checked: it is OK. */ - FRAG_APPEND_1_CHAR (0x40 + operandP->vop_ndx); - } /* if(vop_ndx>=0) */ - - /* Here to make main operand frag(s). */ - this_add_number = expP->X_add_number; - this_add_symbol = expP->X_add_symbol; - to_seg = *segP; - is_undefined = (to_seg == undefined_section); - is_absolute = (to_seg == absolute_section); - at = operandP->vop_mode & 1; - length = (operandP->vop_short == 'b' - ? 1 : (operandP->vop_short == 'w' - ? 2 : (operandP->vop_short == 'l' - ? 4 : 0))); - nbytes = operandP->vop_nbytes; - if (operandP->vop_access == 'b') - { - if (to_seg == now_seg || is_undefined) - { - /* If is_undefined, then it might BECOME now_seg. */ - if (nbytes) - { - p = frag_more (nbytes); - fix_new (frag_now, p - frag_now->fr_literal, nbytes, - this_add_symbol, this_add_number, 1, NO_RELOC); - } - else - { - /* to_seg==now_seg || to_seg == SEG_UNKNOWN */ - /* nbytes==0 */ - length_code = is_undefined ? STATE_UNDF : STATE_BYTE; - if (opcode_as_number & VIT_OPCODE_SPECIAL) - { - if (operandP->vop_width == VAX_WIDTH_UNCONDITIONAL_JUMP) - { - /* br or jsb */ - frag_var (rs_machine_dependent, 5, 1, - ENCODE_RELAX (STATE_ALWAYS_BRANCH, length_code), - this_add_symbol, this_add_number, - opcode_low_byteP); - } - else - { - if (operandP->vop_width == VAX_WIDTH_WORD_JUMP) - { - length_code = STATE_WORD; - /* JF: There is no state_byte for this one! */ - frag_var (rs_machine_dependent, 10, 2, - ENCODE_RELAX (STATE_COMPLEX_BRANCH, length_code), - this_add_symbol, this_add_number, - opcode_low_byteP); - } - else - { - know (operandP->vop_width == VAX_WIDTH_BYTE_JUMP); - frag_var (rs_machine_dependent, 9, 1, - ENCODE_RELAX (STATE_COMPLEX_HOP, length_code), - this_add_symbol, this_add_number, - opcode_low_byteP); - } - } - } - else - { - know (operandP->vop_width == VAX_WIDTH_CONDITIONAL_JUMP); - frag_var (rs_machine_dependent, 7, 1, - ENCODE_RELAX (STATE_CONDITIONAL_BRANCH, length_code), - this_add_symbol, this_add_number, - opcode_low_byteP); - } - } - } - else - { - /* to_seg != now_seg && to_seg != SEG_UNKNOWN */ - /* --- SEG FLOAT MAY APPEAR HERE --- */ - if (is_absolute) - { - if (nbytes) - { - know (!(opcode_as_number & VIT_OPCODE_SYNTHETIC)); - p = frag_more (nbytes); - /* Conventional relocation. */ - fix_new (frag_now, p - frag_now->fr_literal, nbytes, - section_symbol (absolute_section), - this_add_number, 1, NO_RELOC); - } - else - { - know (opcode_as_number & VIT_OPCODE_SYNTHETIC); - if (opcode_as_number & VIT_OPCODE_SPECIAL) - { - if (operandP->vop_width == VAX_WIDTH_UNCONDITIONAL_JUMP) - { - /* br or jsb */ - *opcode_low_byteP = opcode_as_chars[0] + VAX_WIDEN_LONG; - know (opcode_as_chars[1] == 0); - p = frag_more (5); - p[0] = VAX_ABSOLUTE_MODE; /* @#... */ - md_number_to_chars (p + 1, this_add_number, 4); - /* Now (eg) JMP @#foo or JSB @#foo. */ - } - else - { - if (operandP->vop_width == VAX_WIDTH_WORD_JUMP) - { - p = frag_more (10); - p[0] = 2; - p[1] = 0; - p[2] = VAX_BRB; - p[3] = 6; - p[4] = VAX_JMP; - p[5] = VAX_ABSOLUTE_MODE; /* @#... */ - md_number_to_chars (p + 6, this_add_number, 4); - /* Now (eg) ACBx 1f - BRB 2f - 1: JMP @#foo - 2: */ - } - else - { - know (operandP->vop_width == VAX_WIDTH_BYTE_JUMP); - p = frag_more (9); - p[0] = 2; - p[1] = VAX_BRB; - p[2] = 6; - p[3] = VAX_JMP; - p[4] = VAX_ABSOLUTE_MODE; /* @#... */ - md_number_to_chars (p + 5, this_add_number, 4); - /* Now (eg) xOBxxx 1f - BRB 2f - 1: JMP @#foo - 2: */ - } - } - } - else - { - /* b<cond> */ - *opcode_low_byteP ^= 1; - /* To reverse the condition in a VAX branch, - complement the lowest order bit. */ - p = frag_more (7); - p[0] = 6; - p[1] = VAX_JMP; - p[2] = VAX_ABSOLUTE_MODE; /* @#... */ - md_number_to_chars (p + 3, this_add_number, 4); - /* Now (eg) BLEQ 1f - JMP @#foo - 1: */ - } - } - } - else - { - /* to_seg != now_seg && !is_undefinfed && !is_absolute */ - if (nbytes > 0) - { - /* Pc-relative. Conventional relocation. */ - know (!(opcode_as_number & VIT_OPCODE_SYNTHETIC)); - p = frag_more (nbytes); - fix_new (frag_now, p - frag_now->fr_literal, nbytes, - section_symbol (absolute_section), - this_add_number, 1, NO_RELOC); - } - else - { - know (opcode_as_number & VIT_OPCODE_SYNTHETIC); - if (opcode_as_number & VIT_OPCODE_SPECIAL) - { - if (operandP->vop_width == VAX_WIDTH_UNCONDITIONAL_JUMP) - { - /* br or jsb */ - know (opcode_as_chars[1] == 0); - *opcode_low_byteP = opcode_as_chars[0] + VAX_WIDEN_LONG; - p = frag_more (5); - p[0] = VAX_PC_RELATIVE_MODE; - fix_new (frag_now, - p + 1 - frag_now->fr_literal, 4, - this_add_symbol, - this_add_number, 1, NO_RELOC); - /* Now eg JMP foo or JSB foo. */ - } - else - { - if (operandP->vop_width == VAX_WIDTH_WORD_JUMP) - { - p = frag_more (10); - p[0] = 0; - p[1] = 2; - p[2] = VAX_BRB; - p[3] = 6; - p[4] = VAX_JMP; - p[5] = VAX_PC_RELATIVE_MODE; - fix_new (frag_now, - p + 6 - frag_now->fr_literal, 4, - this_add_symbol, - this_add_number, 1, NO_RELOC); - /* Now (eg) ACBx 1f - BRB 2f - 1: JMP foo - 2: */ - } - else - { - know (operandP->vop_width == VAX_WIDTH_BYTE_JUMP); - p = frag_more (10); - p[0] = 2; - p[1] = VAX_BRB; - p[2] = 6; - p[3] = VAX_JMP; - p[4] = VAX_PC_RELATIVE_MODE; - fix_new (frag_now, - p + 5 - frag_now->fr_literal, - 4, this_add_symbol, - this_add_number, 1, NO_RELOC); - /* Now (eg) xOBxxx 1f - BRB 2f - 1: JMP foo - 2: */ - } - } - } - else - { - know (operandP->vop_width == VAX_WIDTH_CONDITIONAL_JUMP); - *opcode_low_byteP ^= 1; /* Reverse branch condition. */ - p = frag_more (7); - p[0] = 6; - p[1] = VAX_JMP; - p[2] = VAX_PC_RELATIVE_MODE; - fix_new (frag_now, p + 3 - frag_now->fr_literal, - 4, this_add_symbol, - this_add_number, 1, NO_RELOC); - } - } - } - } - } - else - { - /* So it is ordinary operand. */ - know (operandP->vop_access != 'b'); - /* ' ' target-independent: elsewhere. */ - know (operandP->vop_access != ' '); - know (operandP->vop_access == 'a' - || operandP->vop_access == 'm' - || operandP->vop_access == 'r' - || operandP->vop_access == 'v' - || operandP->vop_access == 'w'); - if (operandP->vop_short == 's') - { - if (is_absolute) - { - if (this_add_number >= 64) - { - as_warn (_("Short literal overflow(%ld.), immediate mode assumed."), - (long) this_add_number); - operandP->vop_short = 'i'; - operandP->vop_mode = 8; - operandP->vop_reg = 0xF; - } - } - else - { - as_warn (_("Forced short literal to immediate mode. now_seg=%s to_seg=%s"), - segment_name (now_seg), segment_name (to_seg)); - operandP->vop_short = 'i'; - operandP->vop_mode = 8; - operandP->vop_reg = 0xF; - } - } - if (operandP->vop_reg >= 0 && (operandP->vop_mode < 8 - || (operandP->vop_reg != 0xF && operandP->vop_mode < 10))) - { - /* One byte operand. */ - know (operandP->vop_mode > 3); - FRAG_APPEND_1_CHAR (operandP->vop_mode << 4 | operandP->vop_reg); - /* All 1-bytes except S^# happen here. */ - } - else - { - /* {@}{q^}foo{(Rn)} or S^#foo */ - if (operandP->vop_reg == -1 && operandP->vop_short != 's') - { - /* "{@}{q^}foo" */ - if (to_seg == now_seg) - { - if (length == 0) - { - know (operandP->vop_short == ' '); - length_code = STATE_BYTE; -#ifdef OBJ_ELF - if (S_IS_EXTERNAL (this_add_symbol) - || S_IS_WEAK (this_add_symbol)) - length_code = STATE_UNDF; -#endif - p = frag_var (rs_machine_dependent, 10, 2, - ENCODE_RELAX (STATE_PC_RELATIVE, length_code), - this_add_symbol, this_add_number, - opcode_low_byteP); - know (operandP->vop_mode == 10 + at); - *p = at << 4; - /* At is the only context we need to carry - to other side of relax() process. Must - be in the correct bit position of VAX - operand spec. byte. */ - } - else - { - know (length); - know (operandP->vop_short != ' '); - p = frag_more (length + 1); - p[0] = 0xF | ((at + "?\12\14?\16"[length]) << 4); - fix_new (frag_now, p + 1 - frag_now->fr_literal, - length, this_add_symbol, - this_add_number, 1, NO_RELOC); - } - } - else - { - /* to_seg != now_seg */ - if (this_add_symbol == NULL) - { - know (is_absolute); - /* Do @#foo: simpler relocation than foo-.(pc) anyway. */ - p = frag_more (5); - p[0] = VAX_ABSOLUTE_MODE; /* @#... */ - md_number_to_chars (p + 1, this_add_number, 4); - if (length && length != 4) - as_warn (_("Length specification ignored. Address mode 9F used")); - } - else - { - /* {@}{q^}other_seg */ - know ((length == 0 && operandP->vop_short == ' ') - || (length > 0 && operandP->vop_short != ' ')); - if (is_undefined -#ifdef OBJ_ELF - || S_IS_WEAK(this_add_symbol) - || S_IS_EXTERNAL(this_add_symbol) -#endif - ) - { - switch (length) - { - default: length_code = STATE_UNDF; break; - case 1: length_code = STATE_BYTE; break; - case 2: length_code = STATE_WORD; break; - case 4: length_code = STATE_LONG; break; - } - /* We have a SEG_UNKNOWN symbol. It might - turn out to be in the same segment as - the instruction, permitting relaxation. */ - p = frag_var (rs_machine_dependent, 5, 2, - ENCODE_RELAX (STATE_PC_RELATIVE, length_code), - this_add_symbol, this_add_number, - opcode_low_byteP); - p[0] = at << 4; - } - else - { - if (length == 0) - { - know (operandP->vop_short == ' '); - length = 4; /* Longest possible. */ - } - p = frag_more (length + 1); - p[0] = 0xF | ((at + "?\12\14?\16"[length]) << 4); - md_number_to_chars (p + 1, this_add_number, length); - fix_new (frag_now, - p + 1 - frag_now->fr_literal, - length, this_add_symbol, - this_add_number, 1, NO_RELOC); - } - } - } - } - else - { - /* {@}{q^}foo(Rn) or S^# or I^# or # */ - if (operandP->vop_mode < 0xA) - { - /* # or S^# or I^# */ - if (operandP->vop_access == 'v' - || operandP->vop_access == 'a') - { - if (operandP->vop_access == 'v') - as_warn (_("Invalid operand: immediate value used as base address.")); - else - as_warn (_("Invalid operand: immediate value used as address.")); - /* gcc 2.6.3 is known to generate these in at least - one case. */ - } - if (length == 0 - && is_absolute && (expP->X_op != O_big) - && operandP->vop_mode == 8 /* No '@'. */ - && this_add_number < 64) - { - operandP->vop_short = 's'; - } - if (operandP->vop_short == 's') - { - FRAG_APPEND_1_CHAR (this_add_number); - } - else - { - /* I^#... */ - know (nbytes); - p = frag_more (nbytes + 1); - know (operandP->vop_reg == 0xF); -#ifdef OBJ_ELF - if (flag_want_pic && operandP->vop_mode == 8 - && this_add_symbol != NULL) - { - as_warn (_("Symbol %s used as immediate operand in PIC mode."), - S_GET_NAME (this_add_symbol)); - } -#endif - p[0] = (operandP->vop_mode << 4) | 0xF; - if ((is_absolute) && (expP->X_op != O_big)) - { - /* If nbytes > 4, then we are scrod. We - don't know if the high order bytes - are to be 0xFF or 0x00. BSD4.2 & RMS - say use 0x00. OK --- but this - assembler needs ANOTHER rewrite to - cope properly with this bug. */ - md_number_to_chars (p + 1, this_add_number, - min (sizeof (valueT), - (size_t) nbytes)); - if ((size_t) nbytes > sizeof (valueT)) - memset (p + 1 + sizeof (valueT), - '\0', nbytes - sizeof (valueT)); - } - else - { - if (expP->X_op == O_big) - { - /* Problem here is to get the bytes - in the right order. We stored - our constant as LITTLENUMs, not - bytes. */ - LITTLENUM_TYPE *lP; - - lP = floatP->low; - if (nbytes & 1) - { - know (nbytes == 1); - p[1] = *lP; - } - else - { - for (p++; nbytes; nbytes -= 2, p += 2, lP++) - md_number_to_chars (p, *lP, 2); - } - } - else - { - fix_new (frag_now, p + 1 - frag_now->fr_literal, - nbytes, this_add_symbol, - this_add_number, 0, NO_RELOC); - } - } - } - } - else - { - /* {@}{q^}foo(Rn) */ - know ((length == 0 && operandP->vop_short == ' ') - || (length > 0 && operandP->vop_short != ' ')); - if (length == 0) - { - if (is_absolute) - { - long test; - - test = this_add_number; - - if (test < 0) - test = ~test; - - length = test & 0xffff8000 ? 4 - : test & 0xffffff80 ? 2 - : 1; - } - else - { - length = 4; - } - } - p = frag_more (1 + length); - know (operandP->vop_reg >= 0); - p[0] = operandP->vop_reg - | ((at | "?\12\14?\16"[length]) << 4); - if (is_absolute) - { - md_number_to_chars (p + 1, this_add_number, length); - } - else - { - fix_new (frag_now, p + 1 - frag_now->fr_literal, - length, this_add_symbol, - this_add_number, 0, NO_RELOC); - } - } - } - } - } - } -} - -void -md_begin (void) -{ - const char *errtxt; - FLONUM_TYPE *fP; - int i; - - if ((errtxt = vip_begin (1, "$", "*", "`")) != 0) - as_fatal (_("VIP_BEGIN error:%s"), errtxt); - - for (i = 0, fP = float_operand; - fP < float_operand + VIT_MAX_OPERANDS; - i++, fP++) - { - fP->low = &big_operand_bits[i][0]; - fP->high = &big_operand_bits[i][SIZE_OF_LARGE_NUMBER - 1]; - } -} - -static char *vax_cons_special_reloc; - -void -vax_cons (expressionS *exp, int size) -{ - char *save; - - SKIP_WHITESPACE (); - vax_cons_special_reloc = NULL; - save = input_line_pointer; - if (input_line_pointer[0] == '%') - { - if (strncmp (input_line_pointer + 1, "pcrel", 5) == 0) - { - input_line_pointer += 6; - vax_cons_special_reloc = "pcrel"; - } - if (vax_cons_special_reloc) - { - int bad = 0; - - switch (size) - { - case 1: - if (*input_line_pointer != '8') - bad = 1; - input_line_pointer--; - break; - case 2: - if (input_line_pointer[0] != '1' || input_line_pointer[1] != '6') - bad = 1; - break; - case 4: - if (input_line_pointer[0] != '3' || input_line_pointer[1] != '2') - bad = 1; - break; - default: - bad = 1; - break; - } - - if (bad) - { - as_bad (_("Illegal operands: Only %%r_%s%d allowed in %d-byte data fields"), - vax_cons_special_reloc, size * 8, size); - } - else - { - input_line_pointer += 2; - if (*input_line_pointer != '(') - { - as_bad (_("Illegal operands: %%r_%s%d requires arguments in ()"), - vax_cons_special_reloc, size * 8); - bad = 1; - } - } - - if (bad) - { - input_line_pointer = save; - vax_cons_special_reloc = NULL; - } - else - { - int c; - char *end = ++input_line_pointer; - int npar = 0; - - while (! is_end_of_line[(c = *end)]) - { - if (c == '(') - npar++; - else if (c == ')') - { - if (!npar) - break; - npar--; - } - end++; - } - - if (c != ')') - as_bad (_("Illegal operands: %%r_%s%d requires arguments in ()"), - vax_cons_special_reloc, size * 8); - else - { - *end = '\0'; - expression (exp); - *end = c; - if (input_line_pointer != end) - { - as_bad (_("Illegal operands: %%r_%s%d requires arguments in ()"), - vax_cons_special_reloc, size * 8); - } - else - { - input_line_pointer++; - SKIP_WHITESPACE (); - c = *input_line_pointer; - if (! is_end_of_line[c] && c != ',') - as_bad (_("Illegal operands: garbage after %%r_%s%d()"), - vax_cons_special_reloc, size * 8); - } - } - } - } - } - if (vax_cons_special_reloc == NULL) - expression (exp); -} - -/* This is called by emit_expr via TC_CONS_FIX_NEW when creating a - reloc for a cons. */ - -void -vax_cons_fix_new (fragS *frag, int where, unsigned int nbytes, expressionS *exp) -{ - bfd_reloc_code_real_type r; - - r = (nbytes == 1 ? BFD_RELOC_8 : - (nbytes == 2 ? BFD_RELOC_16 : BFD_RELOC_32)); - - if (vax_cons_special_reloc) - { - if (*vax_cons_special_reloc == 'p') - { - switch (nbytes) - { - case 1: r = BFD_RELOC_8_PCREL; break; - case 2: r = BFD_RELOC_16_PCREL; break; - case 4: r = BFD_RELOC_32_PCREL; break; - default: abort (); - } - } - } - - fix_new_exp (frag, where, (int) nbytes, exp, 0, r); - vax_cons_special_reloc = NULL; -} - -char * -md_atof (int type, char * litP, int * sizeP) -{ - return vax_md_atof (type, litP, sizeP); -} |