diff options
Diffstat (limited to 'binutils-2.25/bfd/mmo.c')
| -rw-r--r-- | binutils-2.25/bfd/mmo.c | 3285 |
1 files changed, 3285 insertions, 0 deletions
diff --git a/binutils-2.25/bfd/mmo.c b/binutils-2.25/bfd/mmo.c new file mode 100644 index 00000000..cd7b0fc6 --- /dev/null +++ b/binutils-2.25/bfd/mmo.c @@ -0,0 +1,3285 @@ +/* BFD back-end for mmo objects (MMIX-specific object-format). + Copyright 2001-2013 Free Software Foundation, Inc. + Written by Hans-Peter Nilsson (hp@bitrange.com). + Infrastructure and other bits originally copied from srec.c and + binary.c. + + This file is part of BFD, the Binary File Descriptor library. + + This program 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 of the License, or + (at your option) any later version. + + This program 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 this program; if not, write to the Free Software + Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, + MA 02110-1301, USA. */ + + +/* +SECTION + mmo backend + + The mmo object format is used exclusively together with Professor + Donald E.@: Knuth's educational 64-bit processor MMIX. The simulator + @command{mmix} which is available at + @url{http://www-cs-faculty.stanford.edu/~knuth/programs/mmix.tar.gz} + understands this format. That package also includes a combined + assembler and linker called @command{mmixal}. The mmo format has + no advantages feature-wise compared to e.g. ELF. It is a simple + non-relocatable object format with no support for archives or + debugging information, except for symbol value information and + line numbers (which is not yet implemented in BFD). See + @url{http://www-cs-faculty.stanford.edu/~knuth/mmix.html} for more + information about MMIX. The ELF format is used for intermediate + object files in the BFD implementation. + +@c We want to xref the symbol table node. A feature in "chew" +@c requires that "commands" do not contain spaces in the +@c arguments. Hence the hyphen in "Symbol-table". +@menu +@* File layout:: +@* Symbol-table:: +@* mmo section mapping:: +@end menu + +INODE +File layout, Symbol-table, mmo, mmo +SUBSECTION + File layout + + The mmo file contents is not partitioned into named sections as + with e.g.@: ELF. Memory areas is formed by specifying the + location of the data that follows. Only the memory area + @samp{0x0000@dots{}00} to @samp{0x01ff@dots{}ff} is executable, so + it is used for code (and constants) and the area + @samp{0x2000@dots{}00} to @samp{0x20ff@dots{}ff} is used for + writable data. @xref{mmo section mapping}. + + There is provision for specifying ``special data'' of 65536 + different types. We use type 80 (decimal), arbitrarily chosen the + same as the ELF <<e_machine>> number for MMIX, filling it with + section information normally found in ELF objects. @xref{mmo + section mapping}. + + Contents is entered as 32-bit words, xor:ed over previous + contents, always zero-initialized. A word that starts with the + byte @samp{0x98} forms a command called a @samp{lopcode}, where + the next byte distinguished between the thirteen lopcodes. The + two remaining bytes, called the @samp{Y} and @samp{Z} fields, or + the @samp{YZ} field (a 16-bit big-endian number), are used for + various purposes different for each lopcode. As documented in + @url{http://www-cs-faculty.stanford.edu/~knuth/mmixal-intro.ps.gz}, + the lopcodes are: + + @table @code + @item lop_quote + 0x98000001. The next word is contents, regardless of whether it + starts with 0x98 or not. + + @item lop_loc + 0x9801YYZZ, where @samp{Z} is 1 or 2. This is a location + directive, setting the location for the next data to the next + 32-bit word (for @math{Z = 1}) or 64-bit word (for @math{Z = 2}), + plus @math{Y * 2^56}. Normally @samp{Y} is 0 for the text segment + and 2 for the data segment. + + @item lop_skip + 0x9802YYZZ. Increase the current location by @samp{YZ} bytes. + + @item lop_fixo + 0x9803YYZZ, where @samp{Z} is 1 or 2. Store the current location + as 64 bits into the location pointed to by the next 32-bit + (@math{Z = 1}) or 64-bit (@math{Z = 2}) word, plus @math{Y * + 2^56}. + + @item lop_fixr + 0x9804YYZZ. @samp{YZ} is stored into the current location plus + @math{2 - 4 * YZ}. + + @item lop_fixrx + 0x980500ZZ. @samp{Z} is 16 or 24. A value @samp{L} derived from + the following 32-bit word are used in a manner similar to + @samp{YZ} in lop_fixr: it is xor:ed into the current location + minus @math{4 * L}. The first byte of the word is 0 or 1. If it + is 1, then @math{L = (@var{lowest 24 bits of word}) - 2^Z}, if 0, + then @math{L = (@var{lowest 24 bits of word})}. + + @item lop_file + 0x9806YYZZ. @samp{Y} is the file number, @samp{Z} is count of + 32-bit words. Set the file number to @samp{Y} and the line + counter to 0. The next @math{Z * 4} bytes contain the file name, + padded with zeros if the count is not a multiple of four. The + same @samp{Y} may occur multiple times, but @samp{Z} must be 0 for + all but the first occurrence. + + @item lop_line + 0x9807YYZZ. @samp{YZ} is the line number. Together with + lop_file, it forms the source location for the next 32-bit word. + Note that for each non-lopcode 32-bit word, line numbers are + assumed incremented by one. + + @item lop_spec + 0x9808YYZZ. @samp{YZ} is the type number. Data until the next + lopcode other than lop_quote forms special data of type @samp{YZ}. + @xref{mmo section mapping}. + + Other types than 80, (or type 80 with a content that does not + parse) is stored in sections named <<.MMIX.spec_data.@var{n}>> + where @var{n} is the @samp{YZ}-type. The flags for such a + sections say not to allocate or load the data. The vma is 0. + Contents of multiple occurrences of special data @var{n} is + concatenated to the data of the previous lop_spec @var{n}s. The + location in data or code at which the lop_spec occurred is lost. + + @item lop_pre + 0x980901ZZ. The first lopcode in a file. The @samp{Z} field forms the + length of header information in 32-bit words, where the first word + tells the time in seconds since @samp{00:00:00 GMT Jan 1 1970}. + + @item lop_post + 0x980a00ZZ. @math{Z > 32}. This lopcode follows after all + content-generating lopcodes in a program. The @samp{Z} field + denotes the value of @samp{rG} at the beginning of the program. + The following @math{256 - Z} big-endian 64-bit words are loaded + into global registers @samp{$G} @dots{} @samp{$255}. + + @item lop_stab + 0x980b0000. The next-to-last lopcode in a program. Must follow + immediately after the lop_post lopcode and its data. After this + lopcode follows all symbols in a compressed format + (@pxref{Symbol-table}). + + @item lop_end + 0x980cYYZZ. The last lopcode in a program. It must follow the + lop_stab lopcode and its data. The @samp{YZ} field contains the + number of 32-bit words of symbol table information after the + preceding lop_stab lopcode. + @end table + + Note that the lopcode "fixups"; <<lop_fixr>>, <<lop_fixrx>> and + <<lop_fixo>> are not generated by BFD, but are handled. They are + generated by <<mmixal>>. + +EXAMPLE + This trivial one-label, one-instruction file: + +| :Main TRAP 1,2,3 + + can be represented this way in mmo: + +| 0x98090101 - lop_pre, one 32-bit word with timestamp. +| <timestamp> +| 0x98010002 - lop_loc, text segment, using a 64-bit address. +| Note that mmixal does not emit this for the file above. +| 0x00000000 - Address, high 32 bits. +| 0x00000000 - Address, low 32 bits. +| 0x98060002 - lop_file, 2 32-bit words for file-name. +| 0x74657374 - "test" +| 0x2e730000 - ".s\0\0" +| 0x98070001 - lop_line, line 1. +| 0x00010203 - TRAP 1,2,3 +| 0x980a00ff - lop_post, setting $255 to 0. +| 0x00000000 +| 0x00000000 +| 0x980b0000 - lop_stab for ":Main" = 0, serial 1. +| 0x203a4040 @xref{Symbol-table}. +| 0x10404020 +| 0x4d206120 +| 0x69016e00 +| 0x81000000 +| 0x980c0005 - lop_end; symbol table contained five 32-bit words. */ + +#include "sysdep.h" +#include "bfd.h" +#include "libbfd.h" +#include "libiberty.h" +#include "elf/mmix.h" +#include "opcode/mmix.h" + +#define LOP 0x98 +#define LOP_QUOTE 0 +#define LOP_LOC 1 +#define LOP_SKIP 2 +#define LOP_FIXO 3 +#define LOP_FIXR 4 +#define LOP_FIXRX 5 +#define LOP_FILE 6 +#define LOP_LINE 7 +#define LOP_SPEC 8 +#define LOP_PRE 9 +#define LOP_POST 10 +#define LOP_STAB 11 +#define LOP_END 12 + +#define LOP_QUOTE_NEXT ((LOP << 24) | (LOP_QUOTE << 16) | 1) +#define SPEC_DATA_SECTION 80 +#define LOP_SPEC_SECTION \ + ((LOP << 24) | (LOP_SPEC << 16) | SPEC_DATA_SECTION) + +/* Must be a power of two. If you change this to be >= 64k, you need a + new test-case; the ld test b-loc64k.d touches chunk-size problem areas. */ +#define MMO_SEC_CONTENTS_CHUNK_SIZE (1 << 15) + +/* An arbitrary number for the maximum length section name size. */ +#define MAX_SECTION_NAME_SIZE (1024 * 1024) + +/* A quite arbitrary number for the maximum length section size. */ +#define MAX_ARTIFICIAL_SECTION_SIZE (1024 * 1024 * 1024) + +#define MMO3_WCHAR 0x80 +#define MMO3_LEFT 0x40 +#define MMO3_MIDDLE 0x20 +#define MMO3_RIGHT 0x10 +#define MMO3_TYPEBITS 0xf +#define MMO3_REGQUAL_BITS 0xf +#define MMO3_UNDEF 2 +#define MMO3_DATA 8 +#define MMO3_SYMBITS 0x2f + +/* Put these everywhere in new code. */ +#define FATAL_DEBUG \ + _bfd_abort (__FILE__, __LINE__, \ + "Internal: Non-debugged code (test-case missing)") + +#define BAD_CASE(x) \ + _bfd_abort (__FILE__, __LINE__, \ + "bad case for " #x) + +enum mmo_sym_type { mmo_reg_sym, mmo_undef_sym, mmo_data_sym, mmo_abs_sym}; + +/* When scanning the mmo file, a linked list of mmo_symbol + structures is built to represent the symbol table (if there is + one). */ + +struct mmo_symbol + { + struct mmo_symbol *next; + char *name; + bfd_vma value; + enum mmo_sym_type sym_type; + unsigned int serno; + }; + +struct mmo_data_list_struct + { + struct mmo_data_list_struct *next; + bfd_vma where; + bfd_size_type size; + bfd_size_type allocated_size; + bfd_byte data[1]; + }; + +typedef struct mmo_data_list_struct mmo_data_list_type; + +struct mmo_symbol_trie + { + struct mmo_symbol_trie *left; + struct mmo_symbol_trie *right; + struct mmo_symbol_trie *middle; + + bfd_byte symchar; + + /* A zero name means there's nothing here. */ + struct mmo_symbol sym; + }; + +/* The mmo tdata information. */ + +struct mmo_data_struct + { + struct mmo_symbol *symbols; + struct mmo_symbol *symtail; + asymbol *csymbols; + + /* File representation of time (NULL) when this file was created. */ + bfd_byte created[4]; + + /* When we're reading bytes recursively, check this occasionally. + Also holds write errors. */ + bfd_boolean have_error; + + /* Max symbol length that may appear in the lop_stab table. Note that + this table might just hold a subset of symbols for not-really large + programs, as it can only be 65536 * 4 bytes large. */ + int max_symbol_length; + + /* Here's the symbol we build in lop_stab. */ + char *lop_stab_symbol; + + /* Index into lop_stab_symbol for the next character when parsing the + symbol information. */ + int symbol_position; + + /* When creating arbitrary sections, we need to count section numbers. */ + int sec_no; + + /* When writing or reading byte-wise, we need to count the bytes + within a 32-bit word. */ + int byte_no; + + /* We also need a buffer to hold the bytes we count reading or writing. */ + bfd_byte buf[4]; + }; + +typedef struct mmo_data_struct tdata_type; + +struct mmo_section_data_struct + { + mmo_data_list_type *head; + mmo_data_list_type *tail; + }; + +#define mmo_section_data(sec) \ + ((struct mmo_section_data_struct *) (sec)->used_by_bfd) + +/* These structures are used in bfd_map_over_sections constructs. */ + +/* Used when writing out sections; all but the register contents section + which is stored in reg_section. */ +struct mmo_write_sec_info + { + asection *reg_section; + bfd_boolean retval; + }; + +/* Used when trying to find a section corresponding to addr. */ +struct mmo_find_sec_info + { + asection *sec; + bfd_vma addr; + }; + +static bfd_boolean mmo_bfd_copy_private_bfd_data (bfd *, bfd *); +static void mmo_write_section_unless_reg_contents (bfd *, asection *, void *); +static void mmo_find_sec_w_addr (bfd *, asection *, void *); +static void mmo_find_sec_w_addr_grow (bfd *, asection *, void *); +static asection *mmo_make_section (bfd *, const char *); +static void mmo_get_symbol_info (bfd *, asymbol *, symbol_info *); +static void mmo_print_symbol (bfd *, void *, asymbol *, + bfd_print_symbol_type); +static void mmo_init (void); +static bfd_boolean mmo_mkobject (bfd *); +static bfd_boolean mmo_scan (bfd *); +static asection *mmo_decide_section (bfd *, bfd_vma); +static asection *mmo_get_generic_spec_data_section (bfd *, int); +static asection *mmo_get_spec_section (bfd *, int); +static INLINE bfd_byte *mmo_get_loc (asection *, bfd_vma, int); +static void mmo_xore_64 (asection *, bfd_vma vma, bfd_vma value); +static void mmo_xore_32 (asection *, bfd_vma vma, unsigned int); +static void mmo_xore_16 (asection *, bfd_vma vma, unsigned int); +static const bfd_target *mmo_object_p (bfd *); +static void mmo_map_set_sizes (bfd *, asection *, void *); +static bfd_boolean mmo_get_symbols (bfd *); +static bfd_boolean mmo_create_symbol (bfd *, const char *, bfd_vma, + enum mmo_sym_type, unsigned int); +static bfd_boolean mmo_get_section_contents (bfd *, asection *, void *, + file_ptr, bfd_size_type); +static long mmo_get_symtab_upper_bound (bfd *); +static long mmo_canonicalize_symtab (bfd *, asymbol **); +static void mmo_get_symbol_info (bfd *, asymbol *, symbol_info *); +static void mmo_print_symbol (bfd *, void *, asymbol *, + bfd_print_symbol_type); +static bfd_boolean mmo_set_section_contents (bfd *, sec_ptr, const void *, + file_ptr, bfd_size_type); +static int mmo_sizeof_headers (bfd *, struct bfd_link_info *); +static bfd_boolean mmo_internal_write_header (bfd *); +static bfd_boolean mmo_internal_write_post (bfd *, int, asection *); +static bfd_boolean mmo_internal_add_3_sym (bfd *, struct mmo_symbol_trie *, + const struct mmo_symbol *); +static unsigned int mmo_internal_3_length (bfd *, struct mmo_symbol_trie *); +static void mmo_internal_3_dump (bfd *, struct mmo_symbol_trie *); +static void mmo_beb128_out (bfd *, int, int); +static bfd_boolean mmo_internal_write_section (bfd *, asection *); +static void mmo_write_tetra (bfd *, unsigned int); +static void mmo_write_tetra_raw (bfd *, unsigned int); +static void mmo_write_octa (bfd *, bfd_vma); +static void mmo_write_octa_raw (bfd *, bfd_vma); +static bfd_boolean mmo_write_chunk (bfd *, const bfd_byte *, unsigned int); +static bfd_boolean mmo_flush_chunk (bfd *); +static bfd_boolean mmo_write_loc_chunk (bfd *, bfd_vma, const bfd_byte *, + unsigned int, bfd_vma *); +static bfd_boolean mmo_write_chunk_list (bfd *, mmo_data_list_type *); +static bfd_boolean mmo_write_loc_chunk_list (bfd *, mmo_data_list_type *); +static bfd_boolean mmo_write_symbols_and_terminator (bfd *); +static flagword mmo_sec_flags_from_bfd_flags (flagword); +static flagword bfd_sec_flags_from_mmo_flags (flagword); +static bfd_byte mmo_get_byte (bfd *); +static void mmo_write_byte (bfd *, bfd_byte); +static bfd_boolean mmo_new_section_hook (bfd *, asection *); +static int mmo_sort_mmo_symbols (const void *, const void *); +static bfd_boolean mmo_write_object_contents (bfd *); +static bfd_boolean mmo_write_section_description (bfd *, asection *); +static bfd_boolean mmo_has_leading_or_trailing_zero_tetra_p (bfd *, + asection *); + +/* Global "const" variables initialized once. Must not depend on + particular input or caller; put such things into the bfd or elsewhere. + Look ma, no static per-invocation data! */ + +static +char valid_mmo_symbol_character_set[/* A-Z a-z (we assume consecutive + codes; sorry EBCDIC:ers!). */ + + 'Z' - 'A' + 1 + 'z' - 'a' + 1 + /* Digits. */ + + 10 + /* ':' and '_'. */ + + 1 + 1 + /* Codes higher than 126. */ + + 256 - 126 + /* Ending zero. */ + + 1]; + + +/* Get section SECNAME or create one if it doesn't exist. When creating + one, new memory for the name is allocated. */ + +static asection * +mmo_make_section (bfd *abfd, const char *secname) +{ + asection *sec = bfd_get_section_by_name (abfd, secname); + + if (sec == NULL) + { + char *newsecname = strdup (secname); + + if (newsecname == NULL) + { + (*_bfd_error_handler) + (_("%s: No core to allocate section name %s\n"), + bfd_get_filename (abfd), secname); + bfd_set_error (bfd_error_system_call); + return NULL; + } + sec = bfd_make_section (abfd, newsecname); + } + + return sec; +} + +/* Nothing to do, but keep as a placeholder if we need it. + Note that state that might differ between bfd:s must not be initialized + here, nor must it be static. Add it to tdata information instead. */ + +static void +mmo_init (void) +{ + static bfd_boolean inited = FALSE; + int i = 0; + int j = 0; + static const char letters[] + = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789:_"; + + if (inited) + return; + inited = TRUE; + + /* Fill in the set of valid symbol characters. */ + strcpy (valid_mmo_symbol_character_set, letters); + i = strlen (letters); + + for (j = 126; j < 256; j++) + valid_mmo_symbol_character_set[i++] = j; +} + +/* Check whether an existing file is an mmo file. */ + +static const bfd_target * +mmo_object_p (bfd *abfd) +{ + struct stat statbuf; + bfd_byte b[4]; + + mmo_init (); + + if (bfd_stat (abfd, &statbuf) < 0 + || bfd_seek (abfd, (file_ptr) 0, SEEK_SET) != 0 + || bfd_bread (b, 4, abfd) != 4) + goto bad_final; + + /* All mmo files are a multiple of four bytes long. + Only recognize version one. */ + if ((statbuf.st_size % 4) != 0 + || b[0] != LOP || b[1] != LOP_PRE || b[2] != 1) + goto bad_format; + + /* Get the last 32-bit word. */ + if (bfd_seek (abfd, (file_ptr) statbuf.st_size - 4, SEEK_SET) != 0 + || bfd_bread (b, 4, abfd) != 4) + goto bad_final; + + /* Check if the file ends in a lop_end lopcode. */ + if (b[0] != LOP || b[1] != LOP_END || ! mmo_mkobject (abfd)) + goto bad_format; + + /* Compute an upper bound on the max symbol length. Not really + important as all of the symbol information can only be 256k. */ + abfd->tdata.mmo_data->max_symbol_length = (b[2] * 256 + b[3]) * 4; + abfd->tdata.mmo_data->lop_stab_symbol + = bfd_malloc (abfd->tdata.mmo_data->max_symbol_length + 1); + + if (abfd->tdata.mmo_data->lop_stab_symbol == NULL) + { + (*_bfd_error_handler) + (_("%s: No core to allocate a symbol %d bytes long\n"), + bfd_get_filename (abfd), abfd->tdata.mmo_data->max_symbol_length); + goto bad_final; + } + + /* Read in everything. */ + if (! mmo_scan (abfd)) + goto bad_format_free; + + if (abfd->symcount > 0) + abfd->flags |= HAS_SYMS; + + /* You'll have to tweak this if you want to use this format for other + arches (not recommended due to its small-size limitations). Look at + the ELF format for how to make it target-generic. */ + if (! bfd_default_set_arch_mach (abfd, bfd_arch_mmix, 0)) + goto bad_format_free; + + return abfd->xvec; + + bad_format_free: + free (abfd->tdata.mmo_data->lop_stab_symbol); + bad_format: + bfd_set_error (bfd_error_wrong_format); + bad_final: + return NULL; +} + +/* Set up the mmo tdata information. */ + +static bfd_boolean +mmo_mkobject (bfd *abfd) +{ + mmo_init (); + + if (abfd->tdata.mmo_data == NULL) + { + time_t created; + + /* All fields are zero-initialized, so we don't have to explicitly + initialize most. */ + tdata_type *tdata = (tdata_type *) bfd_zmalloc (sizeof (tdata_type)); + if (tdata == NULL) + return FALSE; + + created = time (NULL); + bfd_put_32 (abfd, created, tdata->created); + + abfd->tdata.mmo_data = tdata; + } + + return TRUE; +} + +static bfd_boolean +mmo_bfd_copy_private_bfd_data (bfd *ibfd, bfd *obfd) +{ + if (bfd_get_flavour (ibfd) != bfd_target_mmo_flavour + || bfd_get_flavour (obfd) != bfd_target_mmo_flavour) + return TRUE; + + /* Copy the time the copied-from file was created. If people want the + time the file was last *modified*, they have that in the normal file + information. */ + memcpy (obfd->tdata.mmo_data->created, ibfd->tdata.mmo_data->created, + sizeof (obfd->tdata.mmo_data->created)); + return TRUE; +} + +/* Helper functions for mmo_decide_section, used through + bfd_map_over_sections. */ + +static void +mmo_find_sec_w_addr (bfd *abfd ATTRIBUTE_UNUSED, asection *sec, void *p) +{ + struct mmo_find_sec_info *infop = (struct mmo_find_sec_info *) p; + bfd_vma vma = bfd_get_section_vma (abfd, sec); + + /* Ignore sections that aren't loaded. */ + if ((bfd_get_section_flags (abfd, sec) & (SEC_LOAD | SEC_ALLOC)) + != (SEC_LOAD | SEC_ALLOC)) + return; + + if (infop->addr >= vma && infop->addr < vma + sec->size) + infop->sec = sec; +} + +static void +mmo_find_sec_w_addr_grow (bfd *abfd ATTRIBUTE_UNUSED, asection *sec, void *p) +{ + struct mmo_find_sec_info *infop = (struct mmo_find_sec_info *) p; + bfd_vma vma = bfd_get_section_vma (abfd, sec); + + /* Ignore sections that aren't loaded. */ + if ((bfd_get_section_flags (abfd, sec) & (SEC_LOAD | SEC_ALLOC)) + != (SEC_LOAD | SEC_ALLOC)) + return; + + if (infop->addr >= vma && infop->addr < vma + MAX_ARTIFICIAL_SECTION_SIZE) + infop->sec = sec; +} + +/* Find a section that corresponds to a VMA. Automatically create .text + or .data and set current section to it, depending on what vma. If we + can't deduce a section, make one up as ".MMIX.sec.N", where N is an + increasing number. */ + +static asection * +mmo_decide_section (bfd *abfd, bfd_vma vma) +{ + asection *sec = NULL; + char sec_name[sizeof (".MMIX.sec.") + 20]; + struct mmo_find_sec_info info; + + info.addr = vma; + info.sec = NULL; + + /* First see if there's a section that would match exactly. */ + bfd_map_over_sections (abfd, mmo_find_sec_w_addr, &info); + + if (info.sec != NULL) + return info.sec; + + /* If there's no such section, try and expand one of the existing ones, + up to a limit. Make sure we have .text and .data before we try that; + create them corresponding to expected addresses and set flags to make + them match the "loaded and with contents" expectation. */ + if ((vma >> 56) == 0) + { + sec = bfd_make_section_old_way (abfd, MMO_TEXT_SECTION_NAME); + + if (sec == NULL) + return NULL; + + if (! sec->user_set_vma && ! bfd_set_section_vma (abfd, sec, vma)) + return NULL; + + if (! bfd_set_section_flags (abfd, sec, + bfd_get_section_flags (abfd, sec) + | SEC_CODE | SEC_LOAD | SEC_ALLOC)) + return NULL; + } + else if ((vma >> 56) == 0x20) + { + sec = bfd_make_section_old_way (abfd, MMO_DATA_SECTION_NAME); + + if (sec == NULL) + return NULL; + + if (! sec->user_set_vma && ! bfd_set_section_vma (abfd, sec, vma)) + return NULL; + + if (! bfd_set_section_flags (abfd, sec, + bfd_get_section_flags (abfd, sec) + | SEC_LOAD | SEC_ALLOC)) + return NULL; + } + + bfd_map_over_sections (abfd, mmo_find_sec_w_addr_grow, &info); + + if (info.sec != NULL) + return info.sec; + + /* If there's still no suitable section, make a new one. */ + sprintf (sec_name, ".MMIX.sec.%d", abfd->tdata.mmo_data->sec_no++); + sec = mmo_make_section (abfd, sec_name); + + if (! sec->user_set_vma && ! bfd_set_section_vma (abfd, sec, vma)) + return NULL; + + if (! bfd_set_section_flags (abfd, sec, + bfd_get_section_flags (abfd, sec) + | SEC_LOAD | SEC_ALLOC)) + return NULL; + return sec; +} + +/* Xor in a 64-bit value VALUE at VMA. */ + +static INLINE void +mmo_xore_64 (asection *sec, bfd_vma vma, bfd_vma value) +{ + bfd_byte *loc = mmo_get_loc (sec, vma, 8); + bfd_vma prev = bfd_get_64 (sec->owner, loc); + + value ^= prev; + bfd_put_64 (sec->owner, value, loc); +} + +/* Xor in a 32-bit value VALUE at VMA. */ + +static INLINE void +mmo_xore_32 (asection *sec, bfd_vma vma, unsigned int value) +{ + bfd_byte *loc = mmo_get_loc (sec, vma, 4); + unsigned int prev = bfd_get_32 (sec->owner, loc); + + value ^= prev; + bfd_put_32 (sec->owner, value, loc); +} + +/* Xor in a 16-bit value VALUE at VMA. */ + +static INLINE void +mmo_xore_16 (asection *sec, bfd_vma vma, unsigned int value) +{ + bfd_byte *loc = mmo_get_loc (sec, vma, 2); + unsigned int prev = bfd_get_16 (sec->owner, loc); + + value ^= prev; + bfd_put_16 (sec->owner, value, loc); +} + +/* Write a 32-bit word to output file, no lop_quote generated. */ + +static INLINE void +mmo_write_tetra_raw (bfd *abfd, unsigned int value) +{ + bfd_byte buf[4]; + + bfd_put_32 (abfd, value, buf); + + if (bfd_bwrite (buf, 4, abfd) != 4) + abfd->tdata.mmo_data->have_error = TRUE; +} + +/* Write a 32-bit word to output file; lop_quote if necessary. */ + +static INLINE void +mmo_write_tetra (bfd *abfd, unsigned int value) +{ + if (((value >> 24) & 0xff) == LOP) + mmo_write_tetra_raw (abfd, LOP_QUOTE_NEXT); + + mmo_write_tetra_raw (abfd, value); +} + +/* Write a 64-bit word to output file, perhaps with lop_quoting. */ + +static INLINE void +mmo_write_octa (bfd *abfd, bfd_vma value) +{ + mmo_write_tetra (abfd, (unsigned int) (value >> 32)); + mmo_write_tetra (abfd, (unsigned int) value); +} + +/* Write a 64-bit word to output file, without lop_quoting. */ + +static INLINE void +mmo_write_octa_raw (bfd *abfd, bfd_vma value) +{ + mmo_write_tetra_raw (abfd, (unsigned int) (value >> 32)); + mmo_write_tetra_raw (abfd, (unsigned int) value); +} + +/* Write quoted contents. Intended to be called multiple times in + sequence, followed by a call to mmo_flush_chunk. */ + +static INLINE bfd_boolean +mmo_write_chunk (bfd *abfd, const bfd_byte *loc, unsigned int len) +{ + bfd_boolean retval = TRUE; + struct mmo_data_struct *mmop = abfd->tdata.mmo_data; + + /* Fill up a tetra from bytes remaining from a previous chunk. */ + if (mmop->byte_no != 0) + { + while (mmop->byte_no < 4 && len != 0) + { + mmop->buf[mmop->byte_no++] = *loc++; + len--; + } + + if (mmop->byte_no == 4) + { + mmo_write_tetra (abfd, bfd_get_32 (abfd, mmop->buf)); + mmop->byte_no = 0; + } + } + + while (len >= 4) + { + if (loc[0] == LOP) + mmo_write_tetra_raw (abfd, LOP_QUOTE_NEXT); + + retval = (retval + && ! mmop->have_error + && 4 == bfd_bwrite (loc, 4, abfd)); + + loc += 4; + len -= 4; + } + + if (len) + { + memcpy (mmop->buf, loc, len); + mmop->byte_no = len; + } + + if (! retval) + mmop->have_error = TRUE; + return retval; +} + +/* Flush remaining bytes, from a previous mmo_write_chunk, zero-padded to + 4 bytes. */ + +static INLINE bfd_boolean +mmo_flush_chunk (bfd *abfd) +{ + if (abfd->tdata.mmo_data->byte_no != 0) + { + memset (abfd->tdata.mmo_data->buf + abfd->tdata.mmo_data->byte_no, + 0, 4 - abfd->tdata.mmo_data->byte_no); + mmo_write_tetra (abfd, + bfd_get_32 (abfd, abfd->tdata.mmo_data->buf)); + abfd->tdata.mmo_data->byte_no = 0; + } + + return ! abfd->tdata.mmo_data->have_error; +} + +/* Same, but from a list. */ + +static INLINE bfd_boolean +mmo_write_chunk_list (bfd *abfd, mmo_data_list_type *datap) +{ + for (; datap != NULL; datap = datap->next) + if (! mmo_write_chunk (abfd, datap->data, datap->size)) + return FALSE; + + return mmo_flush_chunk (abfd); +} + +/* Write a lop_loc and some contents. A caller needs to call + mmo_flush_chunk after calling this function. The location is only + output if different than *LAST_VMAP, which is updated after this call. */ + +static bfd_boolean +mmo_write_loc_chunk (bfd *abfd, bfd_vma vma, const bfd_byte *loc, + unsigned int len, bfd_vma *last_vmap) +{ + /* Find an initial and trailing section of zero tetras; we don't need to + write out zeros. FIXME: When we do this, we should emit section size + and address specifiers, else objcopy can't always perform an identity + translation. Only do this if we *don't* have left-over data from a + previous write or the vma of this chunk is *not* the next address, + because then data isn't tetrabyte-aligned and we're concatenating to + that left-over data. */ + + if (abfd->tdata.mmo_data->byte_no == 0 || vma != *last_vmap) + { + while (len >= 4 && bfd_get_32 (abfd, loc) == 0) + { + vma += 4; + len -= 4; + loc += 4; + } + + while (len >= 4 && bfd_get_32 (abfd, loc + len - 4) == 0) + len -= 4; + } + + /* Only write out the location if it's different than the one the caller + (supposedly) previously handled, accounting for omitted leading zeros. */ + if (vma != *last_vmap) + { + /* We might be in the middle of a sequence. */ + mmo_flush_chunk (abfd); + + /* We always write the location as 64 bits; no use saving bytes + here. */ + mmo_write_tetra_raw (abfd, (LOP << 24) | (LOP_LOC << 16) | 2); + mmo_write_octa_raw (abfd, vma); + } + + /* Update to reflect end of this chunk, with trailing zeros omitted. */ + *last_vmap = vma + len; + + return (! abfd->tdata.mmo_data->have_error + && mmo_write_chunk (abfd, loc, len)); +} + +/* Same, but from a list. */ + +static INLINE bfd_boolean +mmo_write_loc_chunk_list (bfd *abfd, mmo_data_list_type *datap) +{ + /* Get an address different than the address of the first chunk. */ + bfd_vma last_vma = datap ? datap->where - 1 : 0; + + for (; datap != NULL; datap = datap->next) + if (! mmo_write_loc_chunk (abfd, datap->where, datap->data, datap->size, + &last_vma)) + return FALSE; + + return mmo_flush_chunk (abfd); +} + +/* Make a .MMIX.spec_data.N section. */ + +static asection * +mmo_get_generic_spec_data_section (bfd *abfd, int spec_data_number) +{ + asection *sec; + char secname[sizeof (MMIX_OTHER_SPEC_SECTION_PREFIX) + 20] + = MMIX_OTHER_SPEC_SECTION_PREFIX; + + sprintf (secname + strlen (MMIX_OTHER_SPEC_SECTION_PREFIX), + "%d", spec_data_number); + + sec = mmo_make_section (abfd, secname); + + return sec; +} + +/* Make a special section for SPEC_DATA_NUMBER. If it is the one we use + ourselves, parse some of its data to get at the section name. */ + +static asection * +mmo_get_spec_section (bfd *abfd, int spec_data_number) +{ + char *secname; + asection *sec; + bfd_byte buf[4]; + unsigned int secname_length; + unsigned int i; + bfd_vma section_length; + bfd_vma section_vma; + mmo_data_list_type *loc; + flagword flags; + long orig_pos; + + /* If this isn't the "special" special data, then make a placeholder + section. */ + if (spec_data_number != SPEC_DATA_SECTION) + return mmo_get_generic_spec_data_section (abfd, spec_data_number); + + /* Seek back to this position if there was a format error. */ + orig_pos = bfd_tell (abfd); + + /* Read the length (in 32-bit words). */ + if (bfd_bread (buf, 4, abfd) != 4) + goto format_error; + + if (buf[0] == LOP) + { + if (buf[1] != LOP_QUOTE) + goto format_error; + + if (bfd_bread (buf, 4, abfd) != 4) + goto format_error; + } + + /* We don't care to keep the name length accurate. It's + zero-terminated. */ + secname_length = bfd_get_32 (abfd, buf) * 4; + + /* Check section name length for sanity. */ + if (secname_length > MAX_SECTION_NAME_SIZE) + goto format_error; + + /* This should be free'd regardless if a section is created. */ + secname = bfd_malloc (secname_length + 1); + secname[secname_length] = 0; + + for (i = 0; i < secname_length / 4; i++) + { + if (bfd_bread (secname + i * 4, 4, abfd) != 4) + goto format_error_free; + + if (secname[i * 4] == (char) LOP) + { + /* A bit of overkill, but we handle char 0x98 in a section name, + and recognize misparsing. */ + if (secname[i * 4 + 1] != LOP_QUOTE + || bfd_bread (secname + i * 4, 4, abfd) != 4) + /* Whoops. We thought this was a name, and now we found a + non-lop_quote lopcode before we parsed the whole length of + the name. Signal end-of-file in the same manner. */ + goto format_error_free; + } + } + + /* Get the section flags. */ + if (bfd_bread (buf, 4, abfd) != 4 + || (buf[0] == LOP + && (buf[1] != LOP_QUOTE || bfd_bread (buf, 4, abfd) != 4))) + goto format_error_free; + + flags = bfd_get_32 (abfd, buf); + + /* Get the section length. */ + if (bfd_bread (buf, 4, abfd) != 4 + || (buf[0] == LOP + && (buf[1] != LOP_QUOTE || bfd_bread (buf, 4, abfd) != 4))) + goto format_error_free; + + section_length = (bfd_vma) bfd_get_32 (abfd, buf) << 32; + + /* That's the first, high-part. Now get the low part. */ + + if (bfd_bread (buf, 4, abfd) != 4 + || (buf[0] == LOP + && (buf[1] != LOP_QUOTE || bfd_bread (buf, 4, abfd) != 4))) + goto format_error_free; + + section_length |= (bfd_vma) bfd_get_32 (abfd, buf); + + /* Check the section length for sanity. */ + if (section_length > MAX_ARTIFICIAL_SECTION_SIZE) + goto format_error_free; + + /* Get the section VMA. */ + if (bfd_bread (buf, 4, abfd) != 4 + || (buf[0] == LOP + && (buf[1] != LOP_QUOTE || bfd_bread (buf, 4, abfd) != 4))) + goto format_error_free; + + section_vma = (bfd_vma) bfd_get_32 (abfd, buf) << 32; + + /* That's the first, high-part. Now get the low part. */ + if (bfd_bread (buf, 4, abfd) != 4 + || (buf[0] == LOP + && (buf[1] != LOP_QUOTE || bfd_bread (buf, 4, abfd) != 4))) + goto format_error_free; + + section_vma |= (bfd_vma) bfd_get_32 (abfd, buf); + + sec = mmo_make_section (abfd, secname); + free (secname); + if (sec == NULL) + goto format_error; + + /* We allocate a buffer here for the advertised size, with head room for + tetrabyte alignment. */ + loc = bfd_zmalloc (section_length + 3 + + sizeof (struct mmo_data_list_struct)); + if (loc == NULL) + goto format_error; + + /* Use a TETRA-rounded size for the allocated buffer; we set the + "visible" section size below. */ + loc->size = (section_length + 3) & ~3; + + /* Add in the section flags we found to those bfd entered during this + process and set the contents. */ + if (! bfd_set_section_flags (abfd, sec, + bfd_sec_flags_from_mmo_flags (flags) + | bfd_get_section_flags (abfd, sec) + | (section_length != 0 ? SEC_HAS_CONTENTS : 0)) + || ! bfd_set_section_size (abfd, sec, sec->size + section_length) + /* Set VMA only for the first occurrence. */ + || (! sec->user_set_vma + && ! bfd_set_section_vma (abfd, sec, section_vma))) + { + /* If we get an error for any of the calls above, signal more than + just a format error for the spec section. */ + return NULL; + } + + loc->next = NULL; + if (mmo_section_data (sec)->tail != NULL) + mmo_section_data (sec)->tail->next = loc; + else + mmo_section_data (sec)->head = loc; + mmo_section_data (sec)->tail = loc; + loc->where = section_vma; + + return sec; + + format_error_free: + free (secname); + format_error: + if (bfd_seek (abfd, orig_pos, SEEK_SET) != 0) + return NULL; + + return mmo_get_generic_spec_data_section (abfd, spec_data_number); +} + +/* Read a byte, but read from file in multiples of 32-bit words. */ + +static bfd_byte +mmo_get_byte (bfd *abfd) +{ + bfd_byte retval; + + if (abfd->tdata.mmo_data->byte_no == 0) + { + if (! abfd->tdata.mmo_data->have_error + && bfd_bread (abfd->tdata.mmo_data->buf, 4, abfd) != 4) + { + abfd->tdata.mmo_data->have_error = TRUE; + + /* A value somewhat safe against tripping on some inconsistency + when mopping up after this error. */ + return 128; + } + } + + retval = abfd->tdata.mmo_data->buf[abfd->tdata.mmo_data->byte_no]; + abfd->tdata.mmo_data->byte_no = (abfd->tdata.mmo_data->byte_no + 1) % 4; + + return retval; +} + +/* Write a byte, in multiples of 32-bit words. */ + +static void +mmo_write_byte (bfd *abfd, bfd_byte value) +{ + abfd->tdata.mmo_data->buf[(abfd->tdata.mmo_data->byte_no++ % 4)] = value; + if ((abfd->tdata.mmo_data->byte_no % 4) == 0) + { + if (! abfd->tdata.mmo_data->have_error + && bfd_bwrite (abfd->tdata.mmo_data->buf, 4, abfd) != 4) + abfd->tdata.mmo_data->have_error = TRUE; + } +} + +/* Create a symbol. */ + +static bfd_boolean +mmo_create_symbol (bfd *abfd, const char *symname, bfd_vma addr, enum + mmo_sym_type sym_type, unsigned int serno) +{ + struct mmo_symbol *n; + + n = (struct mmo_symbol *) bfd_alloc (abfd, sizeof (struct mmo_symbol)); + if (n == NULL) + return FALSE; + + n->name = bfd_alloc (abfd, strlen (symname) + 1); + if (n->name == NULL) + return FALSE; + + strcpy (n->name, symname); + + n->value = addr; + n->sym_type = sym_type; + n->serno = serno; + + if (abfd->tdata.mmo_data->symbols == NULL) + abfd->tdata.mmo_data->symbols = n; + else + abfd->tdata.mmo_data->symtail->next = n; + abfd->tdata.mmo_data->symtail = n; + n->next = NULL; + + ++abfd->symcount; + + /* Check that :Main equals the last octa of the .MMIX.reg_contents + section, as it's the one place we're sure to pass when reading a mmo + object. For written objects, we do it while setting the symbol + table. */ + if (strcmp (symname, MMIX_START_SYMBOL_NAME) == 0 + && bfd_get_start_address (abfd) != addr) + { + (*_bfd_error_handler) + (_("%s: invalid mmo file: initialization value for $255 is not `Main'\n"), + bfd_get_filename (abfd)); + bfd_set_error (bfd_error_bad_value); + return FALSE; + } + + return TRUE; +} + +/* Read in symbols. */ + +static bfd_boolean +mmo_get_symbols (bfd *abfd) +{ +/* +INODE +Symbol-table, mmo section mapping, File layout, mmo +SUBSECTION + Symbol table format + + From mmixal.w (or really, the generated mmixal.tex) in + @url{http://www-cs-faculty.stanford.edu/~knuth/programs/mmix.tar.gz}): + ``Symbols are stored and retrieved by means of a @samp{ternary + search trie}, following ideas of Bentley and Sedgewick. (See + ACM--SIAM Symp.@: on Discrete Algorithms @samp{8} (1997), 360--369; + R.@:Sedgewick, @samp{Algorithms in C} (Reading, Mass.@: + Addison--Wesley, 1998), @samp{15.4}.) Each trie node stores a + character, and there are branches to subtries for the cases where + a given character is less than, equal to, or greater than the + character in the trie. There also is a pointer to a symbol table + entry if a symbol ends at the current node.'' + + So it's a tree encoded as a stream of bytes. The stream of bytes + acts on a single virtual global symbol, adding and removing + characters and signalling complete symbol points. Here, we read + the stream and create symbols at the completion points. + + First, there's a control byte <<m>>. If any of the listed bits + in <<m>> is nonzero, we execute what stands at the right, in + the listed order: + +| (MMO3_LEFT) +| 0x40 - Traverse left trie. +| (Read a new command byte and recurse.) +| +| (MMO3_SYMBITS) +| 0x2f - Read the next byte as a character and store it in the +| current character position; increment character position. +| Test the bits of <<m>>: +| +| (MMO3_WCHAR) +| 0x80 - The character is 16-bit (so read another byte, +| merge into current character. +| +| (MMO3_TYPEBITS) +| 0xf - We have a complete symbol; parse the type, value +| and serial number and do what should be done +| with a symbol. The type and length information +| is in j = (m & 0xf). +| +| (MMO3_REGQUAL_BITS) +| j == 0xf: A register variable. The following +| byte tells which register. +| j <= 8: An absolute symbol. Read j bytes as the +| big-endian number the symbol equals. +| A j = 2 with two zero bytes denotes an +| unknown symbol. +| j > 8: As with j <= 8, but add (0x20 << 56) +| to the value in the following j - 8 +| bytes. +| +| Then comes the serial number, as a variant of +| uleb128, but better named ubeb128: +| Read bytes and shift the previous value left 7 +| (multiply by 128). Add in the new byte, repeat +| until a byte has bit 7 set. The serial number +| is the computed value minus 128. +| +| (MMO3_MIDDLE) +| 0x20 - Traverse middle trie. (Read a new command byte +| and recurse.) Decrement character position. +| +| (MMO3_RIGHT) +| 0x10 - Traverse right trie. (Read a new command byte and +| recurse.) + + Let's look again at the <<lop_stab>> for the trivial file + (@pxref{File layout}). + +| 0x980b0000 - lop_stab for ":Main" = 0, serial 1. +| 0x203a4040 +| 0x10404020 +| 0x4d206120 +| 0x69016e00 +| 0x81000000 + + This forms the trivial trie (note that the path between ``:'' and + ``M'' is redundant): + +| 203a ":" +| 40 / +| 40 / +| 10 \ +| 40 / +| 40 / +| 204d "M" +| 2061 "a" +| 2069 "i" +| 016e "n" is the last character in a full symbol, and +| with a value represented in one byte. +| 00 The value is 0. +| 81 The serial number is 1. */ + + bfd_byte m = mmo_get_byte (abfd); + + /* Check first if we have a bad hair day. */ + if (abfd->tdata.mmo_data->have_error) + return FALSE; + + if (m & MMO3_LEFT) + /* Traverse left trie. */ + mmo_get_symbols (abfd); + + if (m & MMO3_SYMBITS) + { + bfd_byte c = mmo_get_byte (abfd); + bfd_byte j = m & MMO3_TYPEBITS; + bfd_vma addr = 0; + enum mmo_sym_type sym_type; + unsigned int serno = 0; + bfd_byte k; + + if (m & MMO3_WCHAR) + { + bfd_byte c2 = mmo_get_byte (abfd); + + /* A two-byte character. We can't grok this, but neither can + mmotype, for other cases than the second byte being zero. */ + + if (c != 0) + { + abfd->tdata.mmo_data->lop_stab_symbol + [abfd->tdata.mmo_data->symbol_position] = 0; + + (*_bfd_error_handler) + (_("%s: unsupported wide character sequence" + " 0x%02X 0x%02X after symbol name starting with `%s'\n"), + bfd_get_filename (abfd), c, c2, + abfd->tdata.mmo_data->lop_stab_symbol); + bfd_set_error (bfd_error_bad_value); + abfd->tdata.mmo_data->have_error = TRUE; + return FALSE; + } + else + c = c2; + } + + abfd->tdata.mmo_data->lop_stab_symbol[abfd->tdata.mmo_data->symbol_position++] = c; + abfd->tdata.mmo_data->lop_stab_symbol[abfd->tdata.mmo_data->symbol_position] = 0; + + if (j & MMO3_REGQUAL_BITS) + { + if (j == MMO3_REGQUAL_BITS) + { + sym_type = mmo_reg_sym; + addr = mmo_get_byte (abfd); + } + else if (j <= 8) + { + unsigned int i; + + for (i = 0; i < j; i++) + addr = (addr << 8) + mmo_get_byte (abfd); + + if (addr == 0 && j == MMO3_UNDEF) + sym_type = mmo_undef_sym; + else + sym_type = mmo_abs_sym; + } + else + { + unsigned int i; + + for (i = MMO3_DATA; i < j; i++) + addr = (addr << 8) + mmo_get_byte (abfd); + + addr += (bfd_vma) 0x20 << 56; + sym_type = mmo_data_sym; + } + + /* Get the serial number. */ + do + { + k = mmo_get_byte (abfd); + serno = (serno << 7) + k; + } + while (k < 128); + serno -= 128; + + /* Got it. Now enter it. Skip a leading ":". */ + if (! abfd->tdata.mmo_data->have_error + && ! mmo_create_symbol (abfd, + abfd->tdata.mmo_data->lop_stab_symbol + + 1, + addr, sym_type, serno)) + abfd->tdata.mmo_data->have_error = TRUE; + } + + if (m & MMO3_MIDDLE) + /* Traverse middle trie. */ + mmo_get_symbols (abfd); + + abfd->tdata.mmo_data->symbol_position--; + } + + if (m & MMO3_RIGHT) + /* Traverse right trie. */ + mmo_get_symbols (abfd); + + return ! abfd->tdata.mmo_data->have_error; +} + +/* Get the location of memory area [VMA..VMA + SIZE - 1], which we think + is in section SEC. Adjust and reallocate zero-initialized contents. + If there's new contents, allocate to the next multiple of + MMO_SEC_CONTENTS_CHUNK_SIZE. */ + +static INLINE bfd_byte * +mmo_get_loc (asection *sec, bfd_vma vma, int size) +{ + bfd_size_type allocated_size; + struct mmo_section_data_struct *sdatap = mmo_section_data (sec); + struct mmo_data_list_struct *datap = sdatap->head; + struct mmo_data_list_struct *entry; + + /* First search the list to see if we have the requested chunk in one + piece, or perhaps if we have a suitable chunk with room to fit. */ + for (; datap != NULL; datap = datap->next) + { + if (datap->where <= vma + && datap->where + datap->size >= vma + size) + return datap->data + vma - datap->where; + else if (datap->where <= vma + && datap->where + datap->allocated_size >= vma + size + /* Only munch on the "allocated size" if it does not + overlap the next chunk. */ + && (datap->next == NULL || datap->next->where >= vma + size)) + { + /* There was room allocated, but the size wasn't set to include + it. Do that now. */ + datap->size += (vma + size) - (datap->where + datap->size); + + /* Update the section size. This happens only if we update the + 32-bit-aligned chunk size. Callers that have + non-32-bit-aligned sections should do all allocation and + size-setting by themselves or at least set the section size + after the last allocating call to this function. */ + if (vma + size > sec->vma + sec->size) + sec->size += (vma + size) - (sec->vma + sec->size); + + return datap->data + vma - datap->where; + } + } + + /* Not found; allocate a new block. First check in case we get a + request for a size split up over several blocks; we'll have to return + NULL for those cases, requesting the caller to split up the request. + Requests with an address aligned on MMO_SEC_CONTENTS_CHUNK_SIZE bytes and + for no more than MMO_SEC_CONTENTS_CHUNK_SIZE will always get resolved. */ + + for (datap = sdatap->head; datap != NULL; datap = datap->next) + if ((datap->where <= vma && datap->where + datap->size > vma) + || (datap->where < vma + size + && datap->where + datap->size >= vma + size)) + return NULL; + + allocated_size + = (size + MMO_SEC_CONTENTS_CHUNK_SIZE - 1) & ~(MMO_SEC_CONTENTS_CHUNK_SIZE - 1); + entry = (mmo_data_list_type *) + bfd_zalloc (sec->owner, sizeof (mmo_data_list_type) + allocated_size); + if (entry == NULL) + return NULL; + entry->where = vma; + entry->size = size; + entry->allocated_size = allocated_size; + + datap = sdatap->head; + + /* Sort the records by address. Optimize for the common case of adding + a record to the end of the list. */ + if (sdatap->tail != NULL && entry->where >= sdatap->tail->where) + { + sdatap->tail->next = entry; + entry->next = NULL; + sdatap->tail = entry; + } + else + { + mmo_data_list_type **look; + for (look = &sdatap->head; + *look != NULL && (*look)->where < entry->where; + look = &(*look)->next) + ; + entry->next = *look; + *look = entry; + if (entry->next == NULL) + { + sdatap->tail = entry; + + /* We get here for the first time (at other times too) for this + section. Say we have contents. */ + if (! bfd_set_section_flags (sec->owner, sec, + bfd_get_section_flags (sec->owner, sec) + | SEC_HAS_CONTENTS)) + return NULL; + } + } + + /* Update the section size. This happens only when we add contents and + re-size as we go. The section size will then be aligned to 32 bits. */ + if (vma + size > sec->vma + sec->size) + sec->size += (vma + size) - (sec->vma + sec->size); + return entry->data; +} + +/* Set sizes once we've read in all sections. */ + +static void +mmo_map_set_sizes (bfd *abfd ATTRIBUTE_UNUSED, asection *sec, + void *ignored ATTRIBUTE_UNUSED) +{ + sec->lma = sec->vma; +} + +/* Read the mmo file and turn it into sections. */ + +static bfd_boolean +mmo_scan (bfd *abfd) +{ + unsigned int i; + unsigned int lineno = 1; + bfd_boolean error = FALSE; + bfd_vma vma = 0; + asection *sec = bfd_make_section_old_way (abfd, MMO_TEXT_SECTION_NAME); + asection *non_spec_sec = NULL; + bfd_vma non_spec_vma = 0; + bfd_size_type nbytes_read = 0; + /* Buffer with room to read a 64-bit value. */ + bfd_byte buf[8]; + long stab_loc = -1; + char *file_names[256]; + + abfd->symcount = 0; + memset (file_names, 0, sizeof (file_names)); + + if (bfd_seek (abfd, (file_ptr) 0, SEEK_SET) != 0) + goto error_return; + + while ((nbytes_read = bfd_bread (buf, 4, abfd)) == 4) + { + if (buf[0] == LOP) + { + unsigned int y = bfd_get_8 (abfd, buf + 2); + unsigned int z = bfd_get_8 (abfd, buf + 3); + + /* Change back to the original section for lopcodes other + than LOP_QUOTE that comes after a LOP_SPEC. */ + if ((buf[1] != LOP_QUOTE || y != 0 || z != 1) + && non_spec_sec != NULL) + { + sec = non_spec_sec; + vma = non_spec_vma; + non_spec_sec = NULL; + } + + switch (buf[1]) + { + default: + (*_bfd_error_handler) + (_("%s: invalid mmo file: unsupported lopcode `%d'\n"), + bfd_get_filename (abfd), buf[1]); + bfd_set_error (bfd_error_bad_value); + goto error_return; + + case LOP_QUOTE: + /* Quote the next 32-bit word. */ + if (y != 0 || z != 1) + { + (*_bfd_error_handler) + (_("%s: invalid mmo file: expected YZ = 1 got YZ = %d for lop_quote\n"), + bfd_get_filename (abfd), y*256+z); + bfd_set_error (bfd_error_bad_value); + goto error_return; + } + if (bfd_bread (buf, 4, abfd) != 4) + goto error_return; + + mmo_xore_32 (sec, vma, bfd_get_32 (abfd, buf)); + vma += 4; + vma &= ~3; + lineno++; + break; + + case LOP_LOC: + /* Set vma (and section). */ + vma = (bfd_vma) y << 56; + if (z == 1) + { + /* Get a 32-bit value. */ + if (bfd_bread (buf, 4, abfd) != 4) + goto error_return; + + vma += bfd_get_32 (abfd, buf); + } + else if (z == 2) + { + /* Get a 64-bit value. */ + if (bfd_bread (buf, 8, abfd) != 8) + goto error_return; + + vma += bfd_get_64 (abfd, buf); + } + else + { + (*_bfd_error_handler) + (_("%s: invalid mmo file: expected z = 1 or z = 2, got z = %d for lop_loc\n"), + bfd_get_filename (abfd), z); + bfd_set_error (bfd_error_bad_value); + goto error_return; + } + + sec = mmo_decide_section (abfd, vma); + if (sec == NULL) + goto error_return; + break; + + case LOP_SKIP: + /* Move forward within the same section. */ + vma += y * 256 + z; + + sec = mmo_decide_section (abfd, vma); + if (sec == NULL) + goto error_return; + break; + + case LOP_FIXO: + /* A fixup: Store the current vma somewhere. Position using + same format as LOP_LOC. */ + { + bfd_vma p = (bfd_vma) y << 56; + asection *fixosec; + + if (z == 1) + { + /* Get a 32-bit value. */ + if (bfd_bread (buf, 4, abfd) != 4) + goto error_return; + + p += bfd_get_32 (abfd, buf); + } + else if (z == 2) + { + /* Get a 64-bit value. */ + if (bfd_bread (buf, 8, abfd) != 8) + goto error_return; + + p += bfd_get_64 (abfd, buf); + } + else + { + (*_bfd_error_handler) + (_("%s: invalid mmo file: expected z = 1 or z = 2, got z = %d for lop_fixo\n"), + bfd_get_filename (abfd), z); + bfd_set_error (bfd_error_bad_value); + goto error_return; + } + + /* The section where we store this address might be a + different one than the current section. */ + fixosec = mmo_decide_section (abfd, p); + if (fixosec == NULL) + goto error_return; + mmo_xore_64 (fixosec, p, vma); + } + break; + + case LOP_FIXR: + /* A fixup: Store YZ of this lopcode into YZ at vma - 4 * yz. */ + { + unsigned int yz = (y * 256 + z); + bfd_vma p = vma + 2 - 4 * yz; + asection *fixrsec = mmo_decide_section (abfd, p); + if (fixrsec == NULL) + goto error_return; + mmo_xore_16 (fixrsec, p, yz); + } + break; + + case LOP_FIXRX: + /* A fixup, similar to lop_fixr, but taking larger numbers + and can change branches into the opposite direction + (gasp!). */ + { + bfd_vma delta; + bfd_vma p; + asection *fixrsec; + + if (y != 0) + { + (*_bfd_error_handler) + (_("%s: invalid mmo file: expected y = 0, got y = %d for lop_fixrx\n"), + bfd_get_filename (abfd), y); + bfd_set_error (bfd_error_bad_value); + goto error_return; + } + + if (z != 16 && z != 24) + { + (*_bfd_error_handler) + (_("%s: invalid mmo file: expected z = 16 or z = 24, got z = %d for lop_fixrx\n"), + bfd_get_filename (abfd), z); + bfd_set_error (bfd_error_bad_value); + goto error_return; + } + + /* Get the next 32-bit value. */ + if (bfd_bread (buf, 4, abfd) != 4) + goto error_return; + + delta = bfd_get_32 (abfd, buf); + + /* Do an, ehm, involved calculation for the location of + the fixup. See mmixal documentation for a verbose + explanation. We follow it verbosely here for the + readers delight. */ + if (buf[0] == 0) + p = vma - 4 * delta; + else if (buf[0] == 1) + p = vma - 4 * ((delta & 0xffffff) - (1 << z)); + else + { + (*_bfd_error_handler) + (_("%s: invalid mmo file: leading byte of operand word must be 0 or 1, got %d for lop_fixrx\n"), + bfd_get_filename (abfd), buf[0]); + bfd_set_error (bfd_error_bad_value); + goto error_return; + } + + fixrsec = mmo_decide_section (abfd, vma); + if (fixrsec == NULL) + goto error_return; + mmo_xore_32 (fixrsec, p, delta); + } + break; + + case LOP_FILE: + /* Set current file and perhaps the file name. Reset line + number. */ + if (z != 0) + { + char *fname = bfd_malloc (z * 4 + 1); + + if (fname == NULL) + { + (*_bfd_error_handler) + (_("%s: cannot allocate file name for file number %d, %d bytes\n"), + bfd_get_filename (abfd), y, z * 4 + 1); + bfd_set_error (bfd_error_system_call); + goto error_return; + } + + fname[z * 4] = 0; + + for (i = 0; i < z; i++) + { + if (bfd_bread (fname + i * 4, 4, abfd) != 4) + { + free (fname); + goto error_return; + } + } + + if (file_names[y] != NULL) + { + (*_bfd_error_handler) + (_("%s: invalid mmo file: file number %d `%s'," + " was already entered as `%s'\n"), + bfd_get_filename (abfd), y, fname, file_names[y]); + bfd_set_error (bfd_error_bad_value); + goto error_return; + } + + file_names[y] = fname; + } + + if (file_names[y] == NULL) + { + (*_bfd_error_handler) + (_("%s: invalid mmo file: file name for number %d" + " was not specified before use\n"), + bfd_get_filename (abfd), y); + bfd_set_error (bfd_error_bad_value); + goto error_return; + } + + lineno = 0; + break; + + case LOP_LINE: + /* Set line number. */ + lineno = y * 256 + z; + /* FIXME: Create a sequence of mmo-specific line number + entries for each section, then translate into canonical + format. */ + break; + + case LOP_SPEC: + /* Special data follows until the next non-lop_quote + lopcode. */ + non_spec_sec = sec; + non_spec_vma = vma; + sec = mmo_get_spec_section (abfd, y * 256 + z); + if (sec == NULL) + goto error_return; + + vma = sec->vma; + break; + + case LOP_PRE: + { + /* We ignore header information, except we read in the + creation time from the first 32-bit word with the time + in seconds since era. */ + if (z >= 1 + && bfd_bread (abfd->tdata.mmo_data->created, 4, + abfd) != 4) + goto error_return; + + for (i = 1; i < z; i++) + if (bfd_bread (buf, 4, abfd) != 4) + goto error_return; + } + break; + + case LOP_POST: + /* This tells of the contents of registers $Z..$255 at + startup. We make a section out of it, with VMA = Z * 8, + but only if Z != 255 or the contents is non-zero. */ + { + asection *rsec; + bfd_byte *loc; + bfd_vma first_octa; + bfd_vma startaddr_octa; + + /* Read first octaword outside loop to simplify logic when + excluding the Z == 255, octa == 0 case. */ + if (bfd_bread (buf, 8, abfd) != 8) + goto error_return; + + first_octa = bfd_get_64 (abfd, buf); + + /* Don't emit contents for the trivial case which is + always present; $255 pointing to Main. */ + if (z != 255) + { + rsec + = bfd_make_section_old_way (abfd, + MMIX_REG_CONTENTS_SECTION_NAME); + rsec->flags |= SEC_LINKER_CREATED; + rsec->vma = z * 8; + loc = mmo_get_loc (rsec, z * 8, (255 - z) * 8); + bfd_put_64 (abfd, first_octa, loc); + + for (i = z + 1; i < 255; i++) + { + if (bfd_bread (loc + (i - z) * 8, 8, abfd) != 8) + goto error_return; + } + + /* Read out the last octabyte, and use it to set the + start address. */ + if (bfd_bread (buf, 8, abfd) != 8) + goto error_return; + + startaddr_octa = bfd_get_64 (abfd, buf); + } + else + startaddr_octa = first_octa; + + if (! bfd_set_start_address (abfd, startaddr_octa)) + { + /* Currently this can't fail, but this should handle + future failures. */ + bfd_set_error (bfd_error_bad_value); + goto error_return; + } + } + break; + + case LOP_STAB: + /* We read in the symbols now, not later. */ + if (y != 0 || z != 0) + { + (*_bfd_error_handler) + (_("%s: invalid mmo file: fields y and z of lop_stab" + " non-zero, y: %d, z: %d\n"), + bfd_get_filename (abfd), y, z); + bfd_set_error (bfd_error_bad_value); + goto error_return; + } + + /* Save the location, so we can check that YZ in the LOP_END + is correct. */ + stab_loc = bfd_tell (abfd); + + /* It's not said that an MMO can be without symbols (though + mmixal will refuse to assemble files without Main), but + it seems it would still be a valid mmo-file, so allow it. + We detect the absence of a symbol area in that the upper + limit is computed (from the lop_end YZ field) as 0. + Don't call mmo_get_symbols; it can only detect the end of + a valid symbol trie, not the absence of one. */ + if (abfd->tdata.mmo_data->max_symbol_length != 0 + && ! mmo_get_symbols (abfd)) + goto error_return; + break; + + case LOP_END: + { + /* This must be the last 32-bit word in an mmo file. + Let's find out. */ + struct stat statbuf; + file_ptr curpos = bfd_tell (abfd); + + if (bfd_stat (abfd, &statbuf) < 0) + goto error_return; + + if (statbuf.st_size != curpos) + { + (*_bfd_error_handler) + (_("%s: invalid mmo file: lop_end not last item in" + " file\n"), + bfd_get_filename (abfd)); + bfd_set_error (bfd_error_bad_value); + goto error_return; + } + + /* Check that the YZ field is right. Subtract the size of + this LOP_END in the calculation; YZ does not include + it. */ + if ((long) (y * 256 + z) * 4 != (curpos - stab_loc) - 4) + { + (*_bfd_error_handler) + (_("%s: invalid mmo file: YZ of lop_end (%ld)" + " not equal to the number of tetras to the preceding" + " lop_stab (%ld)\n"), + bfd_get_filename (abfd), (long) (y * 256 + z), + (curpos - stab_loc - 4)/4); + bfd_set_error (bfd_error_bad_value); + goto error_return; + } + + bfd_map_over_sections (abfd, mmo_map_set_sizes, NULL); + goto done; + } + } + } + else + { + /* This wasn't a lopcode, so store it in the current section. */ + mmo_xore_32 (sec, vma & ~3, bfd_get_32 (abfd, buf)); + vma += 4; + vma &= ~3; + lineno++; + } + } + + /* We know this file is a multiple of four bytes (checked in + mmo_object_p), so if we got something other than 0, this was a bad + file (although it's more likely we'll get 0 in that case too). + If we got end-of-file, then there was no lop_stab, so the file has + invalid format. */ + + if (nbytes_read != 0) + bfd_set_error (bfd_error_system_call); + else + bfd_set_error (bfd_error_bad_value); + + error_return: + error = TRUE; + done: + /* Mark the .text and .data section with their normal attribute if they + contain anything. This is not redundant wrt. mmo_decide_section, + since that code might never execute, and conversely the alloc+code + section flags must be set then. */ + sec = bfd_get_section_by_name (abfd, MMO_TEXT_SECTION_NAME); + if (sec != NULL + && (bfd_get_section_flags (abfd, sec) & SEC_HAS_CONTENTS) + && ! bfd_set_section_flags (abfd, sec, + bfd_get_section_flags (abfd, sec) + | SEC_ALLOC | SEC_LOAD | SEC_CODE)) + error = TRUE; + + sec = bfd_get_section_by_name (abfd, MMO_DATA_SECTION_NAME); + if (sec != NULL + && (bfd_get_section_flags (abfd, sec) & SEC_HAS_CONTENTS) + && ! bfd_set_section_flags (abfd, sec, + bfd_get_section_flags (abfd, sec) + | SEC_ALLOC | SEC_LOAD)) + error = TRUE; + + /* Free whatever resources we took. */ + for (i = 0; i < sizeof (file_names) / sizeof (file_names[0]); i++) + if (file_names[i]) + free (file_names[i]); + return ! error; +} + +/* A hook to set up object file dependent section information. For mmo, + we point out the shape of allocated section contents. */ + +static bfd_boolean +mmo_new_section_hook (bfd *abfd, asection *newsect) +{ + if (!newsect->used_by_bfd) + { + /* We zero-fill all fields and assume NULL is represented by an all + zero-bit pattern. */ + newsect->used_by_bfd + = bfd_zalloc (abfd, sizeof (struct mmo_section_data_struct)); + if (!newsect->used_by_bfd) + return FALSE; + } + + /* Always align to at least 32-bit words. */ + newsect->alignment_power = 2; + return _bfd_generic_new_section_hook (abfd, newsect); +} + +/* We already have section contents loaded for sections that have + contents. */ + +static bfd_boolean +mmo_get_section_contents (bfd *abfd ATTRIBUTE_UNUSED, + asection *sec, + void * location, + file_ptr offset, + bfd_size_type bytes_to_do) +{ + /* Iterate over diminishing chunk sizes, copying contents, like + mmo_set_section_contents. */ + while (bytes_to_do) + { + /* A minor song-and-dance to make sure we're not bitten by the + distant possibility of the cast from bfd_vma to int making the + chunk zero-sized. */ + int chunk_size + = (int) bytes_to_do != 0 ? bytes_to_do : MMO_SEC_CONTENTS_CHUNK_SIZE; + bfd_byte *loc; + + do + loc = mmo_get_loc (sec, sec->vma + offset, chunk_size); + while (loc == NULL && (chunk_size /= 2) != 0); + + if (chunk_size == 0) + return FALSE; + + memcpy (location, loc, chunk_size); + + location += chunk_size; + bytes_to_do -= chunk_size; + offset += chunk_size; + } + return TRUE; +} + +/* Return the amount of memory needed to read the symbol table. */ + +static long +mmo_get_symtab_upper_bound (bfd *abfd) +{ + return (abfd->symcount + 1) * sizeof (asymbol *); +} + +/* Sort mmo symbols by serial number. */ + +static int +mmo_sort_mmo_symbols (const void *arg1, const void *arg2) +{ + const struct mmo_symbol *sym1 = *(const struct mmo_symbol **) arg1; + const struct mmo_symbol *sym2 = *(const struct mmo_symbol **) arg2; + + /* Sort by serial number first. */ + if (sym1->serno < sym2->serno) + return -1; + else if (sym1->serno > sym2->serno) + return 1; + + /* Then sort by address of the table entries. */ + return ((const char *) arg1 - (const char *) arg2); +} + +/* Translate the symbol table. */ + +static long +mmo_canonicalize_symtab (bfd *abfd, asymbol **alocation) +{ + unsigned int symcount = bfd_get_symcount (abfd); + asymbol *csymbols; + unsigned int i; + + csymbols = abfd->tdata.mmo_data->csymbols; + if (csymbols == NULL && symcount != 0) + { + asymbol *c; + struct mmo_symbol *s; + struct mmo_symbol **msp; + + /* First we store the symbols into the table we'll return, then we + qsort it on the serial number, with secondary on the address of + the symbol, to preserve order if there would be non-unique serial + numbers. */ + for (s = abfd->tdata.mmo_data->symbols, + msp = (struct mmo_symbol **) alocation; + s != NULL; + s = s->next, ++msp) + *msp = s; + + *msp = NULL; + + qsort (alocation, symcount, sizeof (struct mmo_symbol *), + mmo_sort_mmo_symbols); + + csymbols = (asymbol *) bfd_alloc (abfd, symcount * sizeof (asymbol)); + if (csymbols == NULL) + return -1; + abfd->tdata.mmo_data->csymbols = csymbols; + + for (msp = (struct mmo_symbol **) alocation, c = csymbols; + *msp != NULL; + msp++, ++c) + { + s = *msp; + c->the_bfd = abfd; + c->name = s->name; + c->value = s->value; + c->flags = BSF_GLOBAL; + + if (s->sym_type == mmo_data_sym) + { + c->section + = bfd_get_section_by_name (abfd, MMO_DATA_SECTION_NAME); + + if (c->section == NULL) + c->section = bfd_abs_section_ptr; + else + c->value -= c->section->vma; + } + else if (s->sym_type == mmo_undef_sym) + c->section = bfd_und_section_ptr; + else if (s->sym_type == mmo_reg_sym) + { + c->section + = bfd_make_section_old_way (abfd, MMIX_REG_SECTION_NAME); + c->section->flags |= SEC_LINKER_CREATED; + } + else + { + asection *textsec + = bfd_get_section_by_name (abfd, MMO_TEXT_SECTION_NAME); + asection *datasec; + + if (textsec != NULL + && c->value >= textsec->vma + && c->value <= textsec->vma + textsec->size) + { + c->section = textsec; + c->value -= c->section->vma; + } + /* In mmo, symbol types depend on the VMA. Therefore, if + the data section isn't within the usual bounds, its + symbols are marked as absolute. Correct that. This + means we can't have absolute symbols with values matching + data section addresses, but we also can't have with + absolute symbols with values matching text section + addresses. For such needs, use the ELF format. */ + else if ((datasec + = bfd_get_section_by_name (abfd, + MMO_DATA_SECTION_NAME)) + != NULL + && c->value >= datasec->vma + && c->value <= datasec->vma + datasec->size) + { + c->section = datasec; + c->value -= c->section->vma; + } + else + c->section = bfd_abs_section_ptr; + } + + c->udata.p = NULL; + } + } + + /* Last, overwrite the incoming table with the right-type entries. */ + for (i = 0; i < symcount; i++) + *alocation++ = csymbols++; + *alocation = NULL; + + return symcount; +} + +/* Get information about a symbol. */ + +static void +mmo_get_symbol_info (bfd *ignore_abfd ATTRIBUTE_UNUSED, + asymbol *symbol, symbol_info *ret) +{ + bfd_symbol_info (symbol, ret); +} + +static void +mmo_print_symbol (bfd *abfd, void *afile, asymbol *symbol, + bfd_print_symbol_type how) +{ + FILE *file = (FILE *) afile; + + switch (how) + { + case bfd_print_symbol_name: + fprintf (file, "%s", symbol->name); + break; + default: + bfd_print_symbol_vandf (abfd, file, symbol); + + fprintf (file, " %-5s %s", + symbol->section->name, + symbol->name); + } +} + +/* We can't map a file directly into executable code, so the + size of header information is irrelevant. */ + +static int +mmo_sizeof_headers (bfd *abfd ATTRIBUTE_UNUSED, + struct bfd_link_info *info ATTRIBUTE_UNUSED) +{ + return 0; +} + +/* Write the (section-neutral) file preamble. */ + +static bfd_boolean +mmo_internal_write_header (bfd *abfd) +{ + const char lop_pre_bfd[] = { LOP, LOP_PRE, 1, 1}; + + if (bfd_bwrite (lop_pre_bfd, 4, abfd) != 4) + return FALSE; + + /* Copy creation time of original file. */ + if (bfd_bwrite (abfd->tdata.mmo_data->created, 4, abfd) != 4) + return FALSE; + + return TRUE; +} + +/* Write the LOP_POST record, with global register initializations. + Z is the Z field of the LOP_POST, corresponding to 255 - number of + registers at DATA. The Z = 255 field is filled in with the + start-address. */ + +static bfd_boolean +mmo_internal_write_post (bfd *abfd, int z, asection *sec) +{ + int i; + bfd_byte buf[8]; + mmo_write_tetra_raw (abfd, (LOP << 24) | (LOP_POST << 16) | z); + + for (i = z; i < 255; i++) + { + bfd_byte *data = mmo_get_loc (sec, i * 8, 8); + + if (bfd_bwrite (data, 8, abfd) != 8) + return FALSE; + } + + /* For Z == $255, we always emit the start location; supposedly Main, + but we have it handy at bfd_get_start_address. If we're called with + Z == 255, don't assume DATA is valid. */ + bfd_put_64 (abfd, bfd_get_start_address (abfd), buf); + + return ! abfd->tdata.mmo_data->have_error && bfd_bwrite (buf, 8, abfd) == 8; +} + +/* Translate to and from BFD flags. This is to make sure that we don't + get bitten by BFD flag number changes. */ + +static flagword +mmo_sec_flags_from_bfd_flags (flagword flags) +{ + flagword oflags = 0; + + if (flags & SEC_ALLOC) + oflags |= MMO_SEC_ALLOC; + if (flags & SEC_LOAD) + oflags |= MMO_SEC_LOAD; + if (flags & SEC_RELOC) + oflags |= MMO_SEC_RELOC; + if (flags & SEC_READONLY) + oflags |= MMO_SEC_READONLY; + if (flags & SEC_CODE) + oflags |= MMO_SEC_CODE; + if (flags & SEC_DATA) + oflags |= MMO_SEC_DATA; + if (flags & SEC_NEVER_LOAD) + oflags |= MMO_SEC_NEVER_LOAD; + if (flags & SEC_IS_COMMON) + oflags |= MMO_SEC_IS_COMMON; + if (flags & SEC_DEBUGGING) + oflags |= MMO_SEC_DEBUGGING; + + return oflags; +} + +static flagword +bfd_sec_flags_from_mmo_flags (flagword flags) +{ + flagword oflags = 0; + + if (flags & MMO_SEC_ALLOC) + oflags |= SEC_ALLOC; + if (flags & MMO_SEC_LOAD) + oflags |= SEC_LOAD; + if (flags & MMO_SEC_RELOC) + oflags |= SEC_RELOC; + if (flags & MMO_SEC_READONLY) + oflags |= SEC_READONLY; + if (flags & MMO_SEC_CODE) + oflags |= SEC_CODE; + if (flags & MMO_SEC_DATA) + oflags |= SEC_DATA; + if (flags & MMO_SEC_NEVER_LOAD) + oflags |= SEC_NEVER_LOAD; + if (flags & MMO_SEC_IS_COMMON) + oflags |= SEC_IS_COMMON; + if (flags & MMO_SEC_DEBUGGING) + oflags |= SEC_DEBUGGING; + + return oflags; +} + +/* Return TRUE iff the leading or trailing tetrabyte in SEC is defined and + is 0. */ + +static bfd_boolean +mmo_has_leading_or_trailing_zero_tetra_p (bfd *abfd, asection *sec) +{ + bfd_vma secaddr = bfd_get_section_vma (abfd, sec); + + if (sec->size < 4) + return FALSE; + + if (bfd_get_32 (abfd, mmo_get_loc (sec, secaddr, 4)) == 0 + && bfd_get_32 (abfd, + mmo_get_loc (sec, secaddr + sec->size - 4, 4)) == 0) + return TRUE; + + return FALSE; +} + +/* Write a section. */ + +static bfd_boolean +mmo_internal_write_section (bfd *abfd, asection *sec) +{ + /* We do it differently depending on what section this is: + + ".text": Output, prepended by information about the first source file + (not yet implemented.) + + ".data": Output. + + (".MMIX.reg_contents": Not handled here.) + + Anything else: Output inside a lop_spec 80, in the format described + above. */ + + if (strcmp (sec->name, MMO_TEXT_SECTION_NAME) == 0) + { + bfd_vma secaddr = bfd_get_section_vma (abfd, sec); + + /* Because leading and trailing zeros are omitted in output, we need to + specify the section boundaries so they're correct when the file + is read in again. That's also the case if this section is + specified as not within its usual boundaries or alignments. */ + if (sec->size != 0 + && (secaddr + sec->size >= (bfd_vma) 1 << 56 + || (secaddr & 3) != 0 + || (sec->size & 3) != 0 + || mmo_has_leading_or_trailing_zero_tetra_p (abfd, sec))) + { + if (!mmo_write_section_description (abfd, sec)) + return FALSE; + } + + /* FIXME: Output source file name and line number. */ + return mmo_write_loc_chunk_list (abfd, mmo_section_data (sec)->head); + } + else if (strcmp (sec->name, MMO_DATA_SECTION_NAME) == 0) + { + bfd_vma secaddr = bfd_get_section_vma (abfd, sec); + + /* Same goes as for MMO_TEXT_SECTION_NAME above. */ + if (sec->size != 0 + && (secaddr < (bfd_vma) 0x20 << 56 + || secaddr + sec->size >= (bfd_vma) 0x21 << 56 + || (secaddr & 3) != 0 + || (sec->size & 3) != 0 + || mmo_has_leading_or_trailing_zero_tetra_p (abfd, sec))) + { + if (!mmo_write_section_description (abfd, sec)) + return FALSE; + } + + return mmo_write_loc_chunk_list (abfd, mmo_section_data (sec)->head); + } + else if (strcmp (sec->name, MMIX_REG_CONTENTS_SECTION_NAME) == 0) + /* Not handled here. */ + { + /* This would normally be an abort call since this can't happen, but + we don't do that. */ + bfd_set_error (bfd_error_bad_value); + return FALSE; + } + else if (CONST_STRNEQ (sec->name, MMIX_OTHER_SPEC_SECTION_PREFIX)) + { + int n = atoi (sec->name + strlen (MMIX_OTHER_SPEC_SECTION_PREFIX)); + + mmo_write_tetra_raw (abfd, (LOP << 24) | (LOP_SPEC << 16) | n); + return (! abfd->tdata.mmo_data->have_error + && mmo_write_chunk_list (abfd, mmo_section_data (sec)->head)); + } + /* Ignore sections that are just allocated or empty; we write out + _contents_ here. */ + else if ((bfd_get_section_flags (abfd, sec) & SEC_HAS_CONTENTS) != 0 + && sec->size != 0) + { + if (!mmo_write_section_description (abfd, sec)) + return FALSE; + + /* Writing a LOP_LOC ends the LOP_SPEC data, and makes data actually + loaded. */ + if (bfd_get_section_flags (abfd, sec) & SEC_LOAD) + return (! abfd->tdata.mmo_data->have_error + && mmo_write_loc_chunk_list (abfd, + mmo_section_data (sec)->head)); + return (! abfd->tdata.mmo_data->have_error + && mmo_write_chunk_list (abfd, mmo_section_data (sec)->head)); + } + + /* Some section without contents. */ + return TRUE; +} + +/* Write the description of a section, extended-mmo-style. */ + +static bfd_boolean +mmo_write_section_description (bfd *abfd, asection *sec) +{ + /* Keep the following document-comment formatted the way it is. */ +/* +INODE +mmo section mapping, , Symbol-table, mmo +SUBSECTION + mmo section mapping + + The implementation in BFD uses special data type 80 (decimal) to + encapsulate and describe named sections, containing e.g.@: debug + information. If needed, any datum in the encapsulation will be + quoted using lop_quote. First comes a 32-bit word holding the + number of 32-bit words containing the zero-terminated zero-padded + segment name. After the name there's a 32-bit word holding flags + describing the section type. Then comes a 64-bit big-endian word + with the section length (in bytes), then another with the section + start address. Depending on the type of section, the contents + might follow, zero-padded to 32-bit boundary. For a loadable + section (such as data or code), the contents might follow at some + later point, not necessarily immediately, as a lop_loc with the + same start address as in the section description, followed by the + contents. This in effect forms a descriptor that must be emitted + before the actual contents. Sections described this way must not + overlap. + + For areas that don't have such descriptors, synthetic sections are + formed by BFD. Consecutive contents in the two memory areas + @samp{0x0000@dots{}00} to @samp{0x01ff@dots{}ff} and + @samp{0x2000@dots{}00} to @samp{0x20ff@dots{}ff} are entered in + sections named <<.text>> and <<.data>> respectively. If an area + is not otherwise described, but would together with a neighboring + lower area be less than @samp{0x40000000} bytes long, it is joined + with the lower area and the gap is zero-filled. For other cases, + a new section is formed, named <<.MMIX.sec.@var{n}>>. Here, + @var{n} is a number, a running count through the mmo file, + starting at 0. + +EXAMPLE + A loadable section specified as: + +| .section secname,"ax" +| TETRA 1,2,3,4,-1,-2009 +| BYTE 80 + + and linked to address @samp{0x4}, is represented by the sequence: + +| 0x98080050 - lop_spec 80 +| 0x00000002 - two 32-bit words for the section name +| 0x7365636e - "secn" +| 0x616d6500 - "ame\0" +| 0x00000033 - flags CODE, READONLY, LOAD, ALLOC +| 0x00000000 - high 32 bits of section length +| 0x0000001c - section length is 28 bytes; 6 * 4 + 1 + alignment to 32 bits +| 0x00000000 - high 32 bits of section address +| 0x00000004 - section address is 4 +| 0x98010002 - 64 bits with address of following data +| 0x00000000 - high 32 bits of address +| 0x00000004 - low 32 bits: data starts at address 4 +| 0x00000001 - 1 +| 0x00000002 - 2 +| 0x00000003 - 3 +| 0x00000004 - 4 +| 0xffffffff - -1 +| 0xfffff827 - -2009 +| 0x50000000 - 80 as a byte, padded with zeros. + + Note that the lop_spec wrapping does not include the section + contents. Compare this to a non-loaded section specified as: + +| .section thirdsec +| TETRA 200001,100002 +| BYTE 38,40 + + This, when linked to address @samp{0x200000000000001c}, is + represented by: + +| 0x98080050 - lop_spec 80 +| 0x00000002 - two 32-bit words for the section name +| 0x7365636e - "thir" +| 0x616d6500 - "dsec" +| 0x00000010 - flag READONLY +| 0x00000000 - high 32 bits of section length +| 0x0000000c - section length is 12 bytes; 2 * 4 + 2 + alignment to 32 bits +| 0x20000000 - high 32 bits of address +| 0x0000001c - low 32 bits of address 0x200000000000001c +| 0x00030d41 - 200001 +| 0x000186a2 - 100002 +| 0x26280000 - 38, 40 as bytes, padded with zeros + + For the latter example, the section contents must not be + loaded in memory, and is therefore specified as part of the + special data. The address is usually unimportant but might + provide information for e.g.@: the DWARF 2 debugging format. */ + + mmo_write_tetra_raw (abfd, LOP_SPEC_SECTION); + mmo_write_tetra (abfd, (strlen (sec->name) + 3) / 4); + mmo_write_chunk (abfd, (bfd_byte *) sec->name, strlen (sec->name)); + mmo_flush_chunk (abfd); + /* FIXME: We can get debug sections (.debug_line & Co.) with a section + flag still having SEC_RELOC set. Investigate. This might be true + for all alien sections; perhaps mmo.em should clear that flag. Might + be related to weak references. */ + mmo_write_tetra (abfd, + mmo_sec_flags_from_bfd_flags + (bfd_get_section_flags (abfd, sec))); + mmo_write_octa (abfd, sec->size); + mmo_write_octa (abfd, bfd_get_section_vma (abfd, sec)); + return TRUE; +} + +/* We save up all data before output. */ + +static bfd_boolean +mmo_set_section_contents (bfd *abfd ATTRIBUTE_UNUSED, sec_ptr sec, + const void *location, file_ptr offset, + bfd_size_type bytes_to_do) +{ + /* Iterate over diminishing chunk sizes, copying contents. */ + while (bytes_to_do) + { + /* A minor song-and-dance to make sure we're not bitten by the + distant possibility of the cast from bfd_vma to int making the + chunk zero-sized. */ + int chunk_size + = (int) bytes_to_do != 0 ? bytes_to_do : MMO_SEC_CONTENTS_CHUNK_SIZE; + bfd_byte *loc; + + do + loc = mmo_get_loc (sec, sec->vma + offset, chunk_size); + while (loc == NULL && (chunk_size /= 2) != 0); + + if (chunk_size == 0) + return FALSE; + + memcpy (loc, location, chunk_size); + + location += chunk_size; + bytes_to_do -= chunk_size; + offset += chunk_size; + } + return TRUE; +} + +/* Add a symbol to a trie-tree. */ + +static bfd_boolean +mmo_internal_add_3_sym (bfd *abfd, struct mmo_symbol_trie *rootp, + const struct mmo_symbol *symp) +{ + const char *name = symp->name; + struct mmo_symbol_trie *trie = rootp; + struct mmo_symbol_trie **triep = NULL; + + while (*name && trie != NULL) + { + if (*name < trie->symchar) + { + triep = &trie->left; + trie = trie->left; + } + else if (*name > trie->symchar) + { + triep = &trie->right; + trie = trie->right; + } + else if (*name == trie->symchar) + { + triep = &trie->middle; + name++; + + /* Make sure "trie" points to where we should fill in the + current symbol whenever we've iterated through "name". We + would lose the right position if we encounter "foobar" then + "foo". */ + if (*name) + trie = trie->middle; + } + } + + while (*name != 0) + { + /* Create middle branches for the rest of the characters. */ + trie = bfd_zalloc (abfd, sizeof (struct mmo_symbol_trie)); + *triep = trie; + trie->symchar = *name++; + triep = &trie->middle; + } + + /* We discover a duplicate symbol rather late in the process, but still; + we discover it and bail out. */ + if (trie->sym.name != NULL) + { + (*_bfd_error_handler) + (_("%s: invalid symbol table: duplicate symbol `%s'\n"), + bfd_get_filename (abfd), trie->sym.name); + bfd_set_error (bfd_error_bad_value); + return FALSE; + } + + memcpy (&trie->sym, symp, sizeof *symp); + return TRUE; +} + +/* Find out the length of the serialized version of a trie in bytes. */ + +static unsigned int +mmo_internal_3_length (bfd *abfd, struct mmo_symbol_trie *trie) +{ + /* First, one for the control byte. */ + unsigned int length = 1; + + if (trie == NULL) + return 0; + + /* Add in the recursion to the left. */ + length += mmo_internal_3_length (abfd, trie->left); + + /* Add in the middle trie and the character. */ + length += 1 + mmo_internal_3_length (abfd, trie->middle); + + /* Add in the recursion to the right. */ + length += mmo_internal_3_length (abfd, trie->right); + + /* Add in bytes for the symbol (if this is an endnode). */ + if (trie->sym.name != NULL) + { + unsigned int serno = trie->sym.serno; + + /* First what it takes to encode the value. */ + if (trie->sym.sym_type == mmo_reg_sym) + length++; + else if (trie->sym.sym_type == mmo_undef_sym) + length += 2; + else + { + bfd_vma value = trie->sym.value; + + /* Coded in one to eight following bytes. */ + if (trie->sym.sym_type == mmo_data_sym) + value -= (bfd_vma) 0x20 << 56; + + do + { + value >>= 8; + length++; + } + while (value != 0); + } + + /* Find out what it takes to encode the serial number. */ + do + { + serno >>= 7; + length++; + } + while (serno != 0); + } + + return length; +} + +/* Helper function for outputting the serial number of a symbol, output as + a variant of leb128 (see dwarf2 documentation) which could be called + beb128. Using a helper function and recursion simplifies debugging. */ + +static void +mmo_beb128_out (bfd *abfd, int serno, int marker) +{ + if (serno & ~0x7f) + mmo_beb128_out (abfd, serno >> 7, 0); + mmo_write_byte (abfd, marker | (serno & 0x7f)); +} + +/* Serialize a trie. */ + +static void +mmo_internal_3_dump (bfd *abfd, struct mmo_symbol_trie *trie) +{ + bfd_byte control = 0; + + if (trie == NULL) + return; + + if (trie->left) + control |= MMO3_LEFT; + + if (trie->middle) + control |= MMO3_MIDDLE; + + if (trie->right) + control |= MMO3_RIGHT; + + if (trie->sym.name != NULL) + { + /* Encode the symbol type and length of value bytes. */ + if (trie->sym.sym_type == mmo_reg_sym) + control |= MMO3_REGQUAL_BITS; + else if (trie->sym.sym_type == mmo_undef_sym) + control |= MMO3_UNDEF; + else + { + bfd_vma value = trie->sym.value; + + /* Coded in 1..8 following bytes. */ + if (trie->sym.sym_type == mmo_data_sym) + { + control |= MMO3_DATA; + value -= (bfd_vma) 0x20 << 56; + } + + do + { + value >>= 8; + control++; + } + while (value != 0); + } + } + + /* The control byte is output before recursing. */ + mmo_write_byte (abfd, control); + + mmo_internal_3_dump (abfd, trie->left); + + if (control & MMO3_SYMBITS) + { + mmo_write_byte (abfd, trie->symchar); + + if (trie->sym.name != NULL) + { + if (trie->sym.sym_type == mmo_reg_sym) + mmo_write_byte (abfd, trie->sym.value); + else if (trie->sym.sym_type == mmo_undef_sym) + { + mmo_write_byte (abfd, 0); + mmo_write_byte (abfd, 0); + } + else + { + bfd_vma value = trie->sym.value; + + bfd_byte byte_n = control & 15; + + /* Coded in 1..8 following bytes. Note that the value is + shifted out big-endian. */ + if (trie->sym.sym_type == mmo_data_sym) + { + value -= (bfd_vma) 0x20 << 56; + byte_n -= 8; + } + + do + { + mmo_write_byte (abfd, (value >> ((byte_n - 1) * 8)) & 0xff); + byte_n--; + } + while (byte_n != 0); + } + + mmo_beb128_out (abfd, trie->sym.serno, 128); + } + mmo_internal_3_dump (abfd, trie->middle); + } + mmo_internal_3_dump (abfd, trie->right); +} + +/* Write symbols in mmo format. Also write the lop_end terminator. */ + +static bfd_boolean +mmo_write_symbols_and_terminator (bfd *abfd) +{ + int count = bfd_get_symcount (abfd); + asymbol **table; + asymbol **orig_table = bfd_get_outsymbols (abfd); + int serno; + struct mmo_symbol_trie root; + int trie_len; + int i; + bfd_byte buf[4]; + + /* Create a symbol for "Main". */ + asymbol *fakemain = bfd_make_empty_symbol (abfd); + + fakemain->flags = BSF_GLOBAL; + fakemain->value = bfd_get_start_address (abfd); + fakemain->name = MMIX_START_SYMBOL_NAME; + fakemain->section = bfd_abs_section_ptr; + + memset (&root, 0, sizeof (root)); + + /* Make all symbols take a left turn. */ + root.symchar = 0xff; + + /* There must always be a ":Main", so we'll add one if there are no + symbols. Make sure we have room for it. */ + table = bfd_alloc (abfd, (count + 1) * sizeof (asymbol *)); + if (table == NULL) + return FALSE; + + memcpy (table, orig_table, count * sizeof (asymbol *)); + + /* Move :Main (if there is one) to the first position. This is + necessary to get the same layout of the trie-tree when linking as + when objcopying the result as in the objcopy.exp test "simple objcopy + of executable". It also automatically takes care of assigning serial + number 1 to :Main (as is mandatory). */ + for (i = 0; i < count; i++) + if (table[i] != NULL + && strcmp (table[i]->name, MMIX_START_SYMBOL_NAME) == 0 + && (table[i]->flags & (BSF_DEBUGGING|BSF_GLOBAL)) == BSF_GLOBAL) + { + asymbol *mainsym = table[i]; + memcpy (table + 1, orig_table, i * sizeof (asymbol *)); + table[0] = mainsym; + + /* Check that the value assigned to :Main is the same as the entry + address. The default linker script asserts this. This is as + good a place as any to check this consistency. */ + if ((mainsym->value + + mainsym->section->output_section->vma + + mainsym->section->output_offset) + != bfd_get_start_address (abfd)) + { + /* Arbitrary buffer to hold the printable representation of a + vma. */ + char vmas_main[40]; + char vmas_start[40]; + bfd_vma vma_start = bfd_get_start_address (abfd); + + sprintf_vma (vmas_main, mainsym->value); + sprintf_vma (vmas_start, vma_start); + + (*_bfd_error_handler) + (_("%s: Bad symbol definition: `Main' set to %s rather" + " than the start address %s\n"), + bfd_get_filename (abfd), vmas_main, vmas_start); + bfd_set_error (bfd_error_bad_value); + return FALSE; + } + break; + } + if (i == count && count != 0) + { + /* When there are symbols, there must be a :Main. There was no + :Main, so we need to add it manually. */ + memcpy (table + 1, orig_table, count * sizeof (asymbol *)); + table[0] = fakemain; + count++; + } + + for (i = 0, serno = 1; i < count && table[i] != NULL; i++) + { + asymbol *s = table[i]; + + /* It's not enough to consult bfd_is_local_label, since it does not + mean "local" in the sense of linkable-and-observable-after-link. + Let's just check the BSF_GLOBAL flag. + + Also, don't export symbols with characters not in the allowed set. */ + if ((s->flags & (BSF_DEBUGGING|BSF_GLOBAL)) == BSF_GLOBAL + && strspn (s->name, + valid_mmo_symbol_character_set) == strlen (s->name)) + { + struct mmo_symbol sym; + memset (&sym, 0, sizeof (sym)); + + /* Need to strip const here; strdup:ing would leak and the + existing string must be safe to reuse. */ + sym.name = (char *) s->name; + sym.value = + s->value + + s->section->output_section->vma + + s->section->output_offset; + + if (bfd_is_und_section (s->section)) + sym.sym_type = mmo_undef_sym; + else if (strcmp (s->section->name, MMO_DATA_SECTION_NAME) == 0 + /* The encoding of data symbols require that the "rest" + of the value fits in 6 bytes, so the upper two bytes + must be 0x2000. All other symbols get to be the + absolute type. */ + && (sym.value >> 48) == 0x2000) + sym.sym_type = mmo_data_sym; + else if (strcmp (s->section->name, MMIX_REG_SECTION_NAME) == 0) + sym.sym_type = mmo_reg_sym; + else if (strcmp (s->section->name, + MMIX_REG_CONTENTS_SECTION_NAME) == 0) + { + sym.sym_type = mmo_reg_sym; + sym.value /= 8; + } + else + sym.sym_type = mmo_abs_sym; + + /* FIXME: We assume the order of the received symbols is an + ordered mapping of the serial numbers. This is not + necessarily true if we e.g. objcopy a mmo file to another and + there are gaps in the numbering. Not sure if this can + happen. Not sure what to do. */ + sym.serno = serno++; + + if (! mmo_internal_add_3_sym (abfd, &root, &sym)) + return FALSE; + } + } + + /* Change the root node to be a ":"-prefix. */ + root.symchar = ':'; + root.middle = root.left; + root.right = NULL; + root.left = NULL; + + /* We have to find out if we can fit the whole symbol table in the mmo + symtab. It would be bad to assume we can always fit it in 262144 + bytes. If we can't, just leave the Main symbol. */ + trie_len = (mmo_internal_3_length (abfd, &root) + 3)/4; + + if (trie_len > 0xffff) + { + /* Test this code by using a lower limit in the test above and check + that the single "Main" symbol is emitted and handled properly. + There's no specific test-case. */ + struct mmo_symbol sym; + + (*_bfd_error_handler) + (_("%s: warning: symbol table too large for mmo, larger than 65535" + " 32-bit words: %d. Only `Main' will be emitted.\n"), + bfd_get_filename (abfd), trie_len); + + memset (&sym, 0, sizeof (sym)); + sym.sym_type = mmo_abs_sym; + sym.name = MMIX_START_SYMBOL_NAME; + sym.serno = 1; + sym.value = bfd_get_start_address (abfd); + + /* Then patch up a symbol table to be just the ":Main" symbol. */ + memset (&root, 0, sizeof (root)); + root.left = root.middle; + root.symchar = 0xff; + root.middle = NULL; + root.right = NULL; + + if (! mmo_internal_add_3_sym (abfd, &root, &sym)) + return FALSE; + + root.symchar = ':'; + root.middle = root.left; + root.right = NULL; + root.left = NULL; + + trie_len = (mmo_internal_3_length (abfd, &root) + 3)/4; + } + + /* Reset the written-bytes counter. */ + abfd->tdata.mmo_data->byte_no = 0; + + /* Put out the lop_stab mark. */ + bfd_put_32 (abfd, (LOP << 24) | (LOP_STAB << 16), buf); + if (bfd_bwrite (buf, 4, abfd) != 4) + return FALSE; + + /* Dump out symbols. */ + mmo_internal_3_dump (abfd, &root); + + if (trie_len != (abfd->tdata.mmo_data->byte_no + 3)/4) + { + /* I haven't seen this trig. It seems no use claiming this case + isn't debugged and abort if we get here. Instead emit a + diagnostic and fail "normally". */ + (*_bfd_error_handler) + (_("%s: internal error, symbol table changed size from %d to %d" + " words\n"), + bfd_get_filename (abfd), trie_len, + (abfd->tdata.mmo_data->byte_no + 3)/4); + bfd_set_error (bfd_error_bad_value); + return FALSE; + } + + /* Dump out remaining bytes in the buffer and handle I/O errors by + propagating errors. */ + if ((abfd->tdata.mmo_data->byte_no % 4) != 0 + || abfd->tdata.mmo_data->have_error) + { + memset (abfd->tdata.mmo_data->buf + (abfd->tdata.mmo_data->byte_no % 4), + 0, 4 - (abfd->tdata.mmo_data->byte_no % 4)); + + if (abfd->tdata.mmo_data->have_error + || bfd_bwrite (abfd->tdata.mmo_data->buf, 4, abfd) != 4) + return FALSE; + } + + bfd_put_32 (abfd, (LOP << 24) | (LOP_END << 16) | trie_len, buf); + return bfd_bwrite (buf, 4, abfd) == 4; +} + +/* Write section unless it is the register contents section. For that, we + instead store the section in the supplied pointer. This function is + used through bfd_map_over_sections. */ + +static void +mmo_write_section_unless_reg_contents (bfd *abfd, asection *sec, void *p) +{ + struct mmo_write_sec_info *infop = (struct mmo_write_sec_info *) p; + + if (! infop->retval) + return; + + if (strcmp (sec->name, MMIX_REG_CONTENTS_SECTION_NAME) == 0) + { + infop->reg_section = sec; + return; + } + + /* Exclude the convenience register section. */ + if (strcmp (sec->name, MMIX_REG_SECTION_NAME) == 0) + { + if (bfd_get_section_flags (abfd, sec) & SEC_HAS_CONTENTS) + { + /* Make sure it hasn't got contents. It seems impossible to + make it carry contents, so we don't have a test-case for + this. */ + (*_bfd_error_handler) + (_("%s: internal error, internal register section %s had" + " contents\n"), + bfd_get_filename (abfd), sec->name); + bfd_set_error (bfd_error_bad_value); + infop->retval = FALSE; + return; + } + + return; + } + + infop->retval = mmo_internal_write_section (abfd, sec); +} + +/* Do the actual output of a file. Assumes mmo_set_section_contents is + already called. */ + +static bfd_boolean +mmo_write_object_contents (bfd *abfd) +{ + struct mmo_write_sec_info wsecinfo; + + /* First, there are a few words of preamble. */ + if (! mmo_internal_write_header (abfd)) + return FALSE; + + wsecinfo.reg_section = NULL; + wsecinfo.retval = TRUE; + + bfd_map_over_sections (abfd, mmo_write_section_unless_reg_contents, + &wsecinfo); + + if (! wsecinfo.retval) + return FALSE; + + if (wsecinfo.reg_section != NULL) + { + asection *sec = wsecinfo.reg_section; + unsigned int z = (unsigned int) (sec->vma / 8); + + /* Registers 0..31 must not be global. Do sanity check on the "vma" + of the register contents section and check that it corresponds to + the length of the section. */ + if (z < 32 || z >= 255 || (sec->vma & 7) != 0 + || sec->vma != 256 * 8 - sec->size - 8) + { + bfd_set_error (bfd_error_bad_value); + + if (sec->size == 0) + /* There must always be at least one such register. */ + (*_bfd_error_handler) + (_("%s: no initialized registers; section length 0\n"), + bfd_get_filename (abfd)); + else if (sec->vma > (256 - 32) * 8) + /* Provide better error message for the case of too many + global registers. */ + (*_bfd_error_handler) + (_("%s: too many initialized registers; section length %ld\n"), + bfd_get_filename (abfd), + (long) sec->size); + else + (*_bfd_error_handler) + (_("%s: invalid start address for initialized registers of" + " length %ld: 0x%lx%08lx\n"), + bfd_get_filename (abfd), + (long) sec->size, + (unsigned long) (sec->vma >> 32), (unsigned long) (sec->vma)); + + return FALSE; + } + + if (! mmo_internal_write_post (abfd, z, sec)) + return FALSE; + } + else + if (! mmo_internal_write_post (abfd, 255, NULL)) + return FALSE; + + return mmo_write_symbols_and_terminator (abfd); +} + +/* If there's anything in particular in a mmo bfd that we want to free, + make this a real function. Only do this if you see major memory + thrashing; zealous free:ing will cause unwanted behavior, especially if + you "free" memory allocated with "bfd_alloc", or even "bfd_release" a + block allocated with "bfd_alloc"; they're really allocated from an + obstack, and we don't know what was allocated there since this + particular allocation. */ + +#define mmo_close_and_cleanup _bfd_generic_close_and_cleanup +#define mmo_bfd_free_cached_info _bfd_generic_bfd_free_cached_info + +/* Perhaps we need to adjust this one; mmo labels (originally) without a + leading ':' might more appropriately be called local. */ +#define mmo_bfd_is_local_label_name bfd_generic_is_local_label_name +#define mmo_bfd_is_target_special_symbol \ + ((bfd_boolean (*) (bfd *, asymbol *)) bfd_false) + +/* Is this one really used or defined by anyone? */ +#define mmo_get_lineno _bfd_nosymbols_get_lineno + +/* FIXME: We can do better on this one, if we have a dwarf2 .debug_line + section or if MMO line numbers are implemented. */ +#define mmo_find_nearest_line _bfd_nosymbols_find_nearest_line +#define mmo_find_inliner_info _bfd_nosymbols_find_inliner_info +#define mmo_make_empty_symbol _bfd_generic_make_empty_symbol +#define mmo_bfd_make_debug_symbol _bfd_nosymbols_bfd_make_debug_symbol +#define mmo_read_minisymbols _bfd_generic_read_minisymbols +#define mmo_minisymbol_to_symbol _bfd_generic_minisymbol_to_symbol + +#define mmo_get_section_contents_in_window \ + _bfd_generic_get_section_contents_in_window +#define mmo_bfd_get_relocated_section_contents \ + bfd_generic_get_relocated_section_contents +#define mmo_bfd_gc_sections bfd_generic_gc_sections +#define mmo_bfd_lookup_section_flags bfd_generic_lookup_section_flags +#define mmo_bfd_link_hash_table_create _bfd_generic_link_hash_table_create +#define mmo_bfd_link_hash_table_free _bfd_generic_link_hash_table_free +#define mmo_bfd_link_add_symbols _bfd_generic_link_add_symbols +#define mmo_bfd_link_just_syms _bfd_generic_link_just_syms +#define mmo_bfd_copy_link_hash_symbol_type \ + _bfd_generic_copy_link_hash_symbol_type +#define mmo_bfd_final_link _bfd_generic_final_link +#define mmo_bfd_link_split_section _bfd_generic_link_split_section + +/* Strictly speaking, only MMIX uses this restricted format, but let's not + stop anybody from shooting themselves in the foot. */ +#define mmo_set_arch_mach bfd_default_set_arch_mach +#define mmo_bfd_relax_section bfd_generic_relax_section +#define mmo_bfd_merge_sections bfd_generic_merge_sections +#define mmo_bfd_is_group_section bfd_generic_is_group_section +#define mmo_bfd_discard_group bfd_generic_discard_group +#define mmo_section_already_linked \ + _bfd_generic_section_already_linked +#define mmo_bfd_define_common_symbol bfd_generic_define_common_symbol + +/* We want to copy time of creation, otherwise we'd use + BFD_JUMP_TABLE_COPY (_bfd_generic). */ +#define mmo_bfd_merge_private_bfd_data _bfd_generic_bfd_merge_private_bfd_data +#define mmo_bfd_copy_private_section_data _bfd_generic_bfd_copy_private_section_data +#define mmo_bfd_copy_private_symbol_data _bfd_generic_bfd_copy_private_symbol_data +#define mmo_bfd_copy_private_header_data _bfd_generic_bfd_copy_private_header_data +#define mmo_bfd_set_private_flags _bfd_generic_bfd_set_private_flags +#define mmo_bfd_print_private_bfd_data _bfd_generic_bfd_print_private_bfd_data + +const bfd_target bfd_mmo_vec = +{ + "mmo", /* name */ + bfd_target_mmo_flavour, + BFD_ENDIAN_BIG, /* target byte order */ + BFD_ENDIAN_BIG, /* target headers byte order */ + + /* FIXME: Might need adjustments. */ + (HAS_RELOC | EXEC_P | /* object flags */ + HAS_LINENO | HAS_DEBUG | + HAS_SYMS | HAS_LOCALS | WP_TEXT), + + /* FIXME: Might need adjustments. */ + (SEC_CODE | SEC_DATA | SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD + | SEC_READONLY | SEC_EXCLUDE | SEC_DEBUGGING | SEC_IN_MEMORY), + /* section flags */ + 0, /* leading underscore */ + ' ', /* ar_pad_char */ + 16, /* ar_max_namelen */ + 0, /* match priority. */ + bfd_getb64, bfd_getb_signed_64, bfd_putb64, + bfd_getb32, bfd_getb_signed_32, bfd_putb32, + bfd_getb16, bfd_getb_signed_16, bfd_putb16, /* data */ + bfd_getb64, bfd_getb_signed_64, bfd_putb64, + bfd_getb32, bfd_getb_signed_32, bfd_putb32, + bfd_getb16, bfd_getb_signed_16, bfd_putb16, /* hdrs */ + + { + _bfd_dummy_target, + mmo_object_p, /* bfd_check_format */ + _bfd_dummy_target, + _bfd_dummy_target, + }, + { + bfd_false, + mmo_mkobject, + bfd_false, + bfd_false, + }, + { /* bfd_write_contents */ + bfd_false, + mmo_write_object_contents, + bfd_false, + bfd_false, + }, + + BFD_JUMP_TABLE_GENERIC (mmo), + BFD_JUMP_TABLE_COPY (mmo), + BFD_JUMP_TABLE_CORE (_bfd_nocore), + BFD_JUMP_TABLE_ARCHIVE (_bfd_noarchive), + BFD_JUMP_TABLE_SYMBOLS (mmo), + BFD_JUMP_TABLE_RELOCS (_bfd_norelocs), + BFD_JUMP_TABLE_WRITE (mmo), + BFD_JUMP_TABLE_LINK (mmo), + BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic), + + NULL, + + NULL +}; |