diff options
Diffstat (limited to 'libiberty/simple-object-coff.c')
| -rw-r--r-- | libiberty/simple-object-coff.c | 459 |
1 files changed, 379 insertions, 80 deletions
diff --git a/libiberty/simple-object-coff.c b/libiberty/simple-object-coff.c index 922477f..7f3b462 100644 --- a/libiberty/simple-object-coff.c +++ b/libiberty/simple-object-coff.c @@ -57,6 +57,32 @@ struct external_filehdr unsigned char f_flags[2]; /* flags */ }; +/* BigObj COFF file header. */ + +struct external_filehdr_bigobj +{ + unsigned char sig1[2]; /* Must be 0x0000 */ + unsigned char sig2[2]; /* Must be 0xFFFF */ + unsigned char version[2]; /* Version, currently 2 */ + unsigned char machine[2]; /* Machine type */ + unsigned char timdat[4]; /* time & date stamp */ + unsigned char classid[16]; /* Magic GUID that identifies BigObj format */ + unsigned char sizeofdata[4]; /* Size of data (unused, set to 0) */ + unsigned char flags[4]; /* Flags (unused, set to 0) */ + unsigned char metadatasize[4]; /* Metadata size (unused, set to 0) */ + unsigned char metadataoffset[4]; /* Metadata offset (unused, set to 0) */ + unsigned char nscns[4]; /* number of sections (32-bit!) */ + unsigned char symptr[4]; /* file pointer to symtab */ + unsigned char nsyms[4]; /* number of symtab entries */ +}; + +/* The BigObj magic GUID (ClassID). */ +static const unsigned char bigobj_magic[16] = +{ + 0xC7, 0xA1, 0xBA, 0xD1, 0xEE, 0xBA, 0xA9, 0x4B, + 0xAF, 0x20, 0xFA, 0xF6, 0x6A, 0xA4, 0xDC, 0xB8 +}; + /* Bits for filehdr f_flags field. */ #define F_EXEC (0x0002) @@ -119,6 +145,28 @@ struct external_syment unsigned char e_numaux[1]; }; +/* BigObj COFF symbol table entry (20 bytes instead of 18). */ + +struct external_syment_bigobj +{ + union + { + unsigned char e_name[E_SYMNMLEN]; + + struct + { + unsigned char e_zeroes[4]; + unsigned char e_offset[4]; + } e; + } e; + + unsigned char e_value[4]; + unsigned char e_scnum[4]; /* 32-bit section number! */ + unsigned char e_type[2]; + unsigned char e_sclass[1]; + unsigned char e_numaux[1]; +}; + /* Length allowed for filename in aux sym format 4. */ #define E_FILNMLEN 18 @@ -149,6 +197,33 @@ union external_auxent } x_scn; }; +/* BigObj auxiliary symbol (20 bytes to match symbol size). */ + +union external_auxent_bigobj +{ + /* Aux sym format 4: file. */ + union + { + char x_fname[E_FILNMLEN]; + struct + { + unsigned char x_zeroes[4]; + unsigned char x_offset[4]; + } x_n; + } x_file; + /* Aux sym format 5: section. */ + struct + { + unsigned char x_scnlen[4]; /* section length */ + unsigned char x_nreloc[2]; /* # relocation entries */ + unsigned char x_nlinno[2]; /* # line numbers */ + unsigned char x_checksum[4]; /* section COMDAT checksum */ + unsigned char x_associated[2]; /* COMDAT assoc section index */ + unsigned char x_comdat[1]; /* COMDAT selection number */ + unsigned char x_pad[3]; /* Padding to 20 bytes */ + } x_scn; +}; + /* Symbol-related constants. */ #define IMAGE_SYM_DEBUG (-2) @@ -168,8 +243,10 @@ struct simple_object_coff_read unsigned short magic; /* Whether the file is big-endian. */ unsigned char is_big_endian; + /* Whether this is BigObj format. */ + unsigned char is_bigobj; /* Number of sections. */ - unsigned short nscns; + unsigned int nscns; /* File offset of symbol table. */ off_t symptr; /* Number of symbol table entries. */ @@ -188,6 +265,8 @@ struct simple_object_coff_attributes unsigned short magic; /* Whether the file is big-endian. */ unsigned char is_big_endian; + /* Whether this is BigObj format. */ + unsigned char is_bigobj; /* Flags. */ unsigned short flags; }; @@ -240,10 +319,12 @@ simple_object_coff_match (unsigned char header[SIMPLE_OBJECT_MATCH_HEADER_LEN], int is_big_endian; unsigned short (*fetch_16) (const unsigned char *); unsigned int (*fetch_32) (const unsigned char *); - unsigned char hdrbuf[sizeof (struct external_filehdr)]; + unsigned char hdrbuf[sizeof (struct external_filehdr_bigobj)]; unsigned short flags; struct simple_object_coff_read *ocr; + unsigned short sig1, sig2; + /* Try regular COFF first. */ c = sizeof (coff_magic) / sizeof (coff_magic[0]); magic_big = simple_object_fetch_big_16 (header); magic_little = simple_object_fetch_little_16 (header); @@ -254,12 +335,64 @@ simple_object_coff_match (unsigned char header[SIMPLE_OBJECT_MATCH_HEADER_LEN], : coff_magic[i].magic == magic_little) break; } - if (i >= c) + + /* Check for BigObj if regular COFF didn't match. */ + sig1 = simple_object_fetch_little_16 (header); + sig2 = simple_object_fetch_little_16 (header + 2); + + if (i >= c && (sig1 != 0 || sig2 != 0xFFFF)) { + /* Not regular COFF and not BigObj. */ *errmsg = NULL; *err = 0; return NULL; } + + if (sig1 == 0 && sig2 == 0xFFFF) + { + /* This looks like BigObj. Verify the ClassID. */ + unsigned char bigobj_hdrbuf[sizeof (struct external_filehdr_bigobj)]; + + if (!simple_object_internal_read (descriptor, offset, bigobj_hdrbuf, + sizeof bigobj_hdrbuf, errmsg, err)) + return NULL; + + if (memcmp (bigobj_hdrbuf + offsetof (struct external_filehdr_bigobj, + classid), + bigobj_magic, 16) != 0) + { + *errmsg = NULL; + *err = 0; + return NULL; + } + + /* BigObj is always little-endian. */ + is_big_endian = 0; + + ocr = XNEW (struct simple_object_coff_read); + ocr->magic = simple_object_fetch_little_16 + (bigobj_hdrbuf + + offsetof (struct external_filehdr_bigobj, machine)); + ocr->is_big_endian = 0; + ocr->is_bigobj = 1; + ocr->nscns = simple_object_fetch_little_32 + (bigobj_hdrbuf + + offsetof (struct external_filehdr_bigobj, nscns)); + ocr->symptr = simple_object_fetch_little_32 + (bigobj_hdrbuf + + offsetof (struct external_filehdr_bigobj, symptr)); + ocr->nsyms = simple_object_fetch_little_32 + (bigobj_hdrbuf + + offsetof (struct external_filehdr_bigobj, nsyms)); + ocr->flags = simple_object_fetch_little_32 + (bigobj_hdrbuf + + offsetof (struct external_filehdr_bigobj, flags)); + ocr->scnhdr_offset = sizeof (struct external_filehdr_bigobj); + + return (void *) ocr; + } + + /* Regular COFF. */ is_big_endian = coff_magic[i].is_big_endian; magic = is_big_endian ? magic_big : magic_little; @@ -270,7 +403,7 @@ simple_object_coff_match (unsigned char header[SIMPLE_OBJECT_MATCH_HEADER_LEN], ? simple_object_fetch_big_32 : simple_object_fetch_little_32); - if (!simple_object_internal_read (descriptor, offset, hdrbuf, sizeof hdrbuf, + if (!simple_object_internal_read (descriptor, offset, hdrbuf, sizeof (struct external_filehdr), errmsg, err)) return NULL; @@ -285,6 +418,7 @@ simple_object_coff_match (unsigned char header[SIMPLE_OBJECT_MATCH_HEADER_LEN], ocr = XNEW (struct simple_object_coff_read); ocr->magic = magic; ocr->is_big_endian = is_big_endian; + ocr->is_bigobj = 0; ocr->nscns = fetch_16 (hdrbuf + offsetof (struct external_filehdr, f_nscns)); ocr->symptr = fetch_32 (hdrbuf + offsetof (struct external_filehdr, f_symptr)); @@ -309,9 +443,13 @@ simple_object_coff_read_strtab (simple_object_read *sobj, size_t *strtab_size, unsigned char strsizebuf[4]; size_t strsize; char *strtab; + size_t sym_size; + + /* Symbol size depends on format. */ + sym_size = ocr->is_bigobj ? sizeof (struct external_syment_bigobj) + : sizeof (struct external_syment); - strtab_offset = sobj->offset + ocr->symptr - + ocr->nsyms * sizeof (struct external_syment); + strtab_offset = sobj->offset + ocr->symptr + ocr->nsyms * sym_size; if (!simple_object_internal_read (sobj->descriptor, strtab_offset, strsizebuf, 4, errmsg, err)) return NULL; @@ -444,6 +582,7 @@ simple_object_coff_fetch_attributes (simple_object_read *sobj, ret = XNEW (struct simple_object_coff_attributes); ret->magic = ocr->magic; ret->is_big_endian = ocr->is_big_endian; + ret->is_bigobj = ocr->is_bigobj; ret->flags = ocr->flags; return ret; } @@ -466,7 +605,9 @@ simple_object_coff_attributes_merge (void *todata, void *fromdata, int *err) struct simple_object_coff_attributes *from = (struct simple_object_coff_attributes *) fromdata; - if (to->magic != from->magic || to->is_big_endian != from->is_big_endian) + if (to->magic != from->magic + || to->is_big_endian != from->is_big_endian + || to->is_bigobj != from->is_bigobj) { *err = 0; return "COFF object format mismatch"; @@ -500,6 +641,52 @@ simple_object_coff_start_write (void *attributes_data, return ret; } +/* Write out a BigObj COFF filehdr. */ + +static int +simple_object_coff_write_filehdr_bigobj (simple_object_write *sobj, + int descriptor, + unsigned int nscns, + size_t symtab_offset, + unsigned int nsyms, + const char **errmsg, int *err) +{ + struct simple_object_coff_attributes *attrs = + (struct simple_object_coff_attributes *) sobj->data; + unsigned char hdrbuf[sizeof (struct external_filehdr_bigobj)]; + unsigned char *hdr; + void (*set_16) (unsigned char *, unsigned short); + void (*set_32) (unsigned char *, unsigned int); + + hdr = &hdrbuf[0]; + + /* BigObj is always little-endian. */ + set_16 = simple_object_set_little_16; + set_32 = simple_object_set_little_32; + + memset (hdr, 0, sizeof (struct external_filehdr_bigobj)); + + /* Set BigObj signatures. */ + set_16 (hdr + offsetof (struct external_filehdr_bigobj, sig1), 0); + set_16 (hdr + offsetof (struct external_filehdr_bigobj, sig2), 0xFFFF); + set_16 (hdr + offsetof (struct external_filehdr_bigobj, version), 2); + set_16 (hdr + offsetof (struct external_filehdr_bigobj, machine), + attrs->magic); + /* timdat left as zero. */ + /* Copy ClassID. */ + memcpy (hdr + offsetof (struct external_filehdr_bigobj, classid), + bigobj_magic, 16); + /* sizeofdata, flags, metadatasize, metadataoffset left as zero. */ + set_32 (hdr + offsetof (struct external_filehdr_bigobj, nscns), nscns); + set_32 (hdr + offsetof (struct external_filehdr_bigobj, symptr), + symtab_offset); + set_32 (hdr + offsetof (struct external_filehdr_bigobj, nsyms), nsyms); + + return simple_object_internal_write (descriptor, 0, hdrbuf, + sizeof (struct external_filehdr_bigobj), + errmsg, err); +} + /* Write out a COFF filehdr. */ static int @@ -618,14 +805,16 @@ simple_object_coff_write_to_file (simple_object_write *sobj, int descriptor, what 'gas' uses when told to assemble from stdin. */ const char *source_filename = "fake"; size_t sflen; - union - { - struct external_syment sym; - union external_auxent aux; - } syms[2]; + size_t symsize; void (*set_16) (unsigned char *, unsigned short); void (*set_32) (unsigned char *, unsigned int); + /* Determine symbol size based on format. */ + if (attrs->is_bigobj) + symsize = sizeof (struct external_syment_bigobj); + else + symsize = sizeof (struct external_syment); + set_16 = (attrs->is_big_endian ? simple_object_set_big_16 : simple_object_set_little_16); @@ -637,7 +826,10 @@ simple_object_coff_write_to_file (simple_object_write *sobj, int descriptor, for (section = sobj->sections; section != NULL; section = section->next) ++nscns; - scnhdr_offset = sizeof (struct external_filehdr); + if (attrs->is_bigobj) + scnhdr_offset = sizeof (struct external_filehdr_bigobj); + else + scnhdr_offset = sizeof (struct external_filehdr); offset = scnhdr_offset + nscns * sizeof (struct external_scnhdr); name_offset = 4; for (section = sobj->sections; section != NULL; section = section->next) @@ -693,91 +885,198 @@ simple_object_coff_write_to_file (simple_object_write *sobj, int descriptor, symtab_offset = offset; /* Advance across space reserved for symbol table to locate start of string table. */ - offset += nsyms * sizeof (struct external_syment); + offset += nsyms * symsize; /* Write out file symbol. */ - memset (&syms[0], 0, sizeof (syms)); - strcpy ((char *)&syms[0].sym.e.e_name[0], ".file"); - set_16 (&syms[0].sym.e_scnum[0], IMAGE_SYM_DEBUG); - set_16 (&syms[0].sym.e_type[0], IMAGE_SYM_TYPE); - syms[0].sym.e_sclass[0] = IMAGE_SYM_CLASS_FILE; - syms[0].sym.e_numaux[0] = 1; - /* The name need not be nul-terminated if it fits into the x_fname field - directly, but must be if it has to be placed into the string table. */ - sflen = strlen (source_filename); - if (sflen <= E_FILNMLEN) - memcpy (&syms[1].aux.x_file.x_fname[0], source_filename, sflen); - else + if (attrs->is_bigobj) { - set_32 (&syms[1].aux.x_file.x_n.x_offset[0], name_offset); - if (!simple_object_internal_write (descriptor, offset + name_offset, - ((const unsigned char *) - source_filename), - sflen + 1, &errmsg, err)) + union + { + struct external_syment_bigobj sym; + union external_auxent_bigobj aux; + } syms[2]; + + memset (&syms[0], 0, sizeof (syms)); + strcpy ((char *)&syms[0].sym.e.e_name[0], ".file"); + set_32 (&syms[0].sym.e_scnum[0], IMAGE_SYM_DEBUG); + set_16 (&syms[0].sym.e_type[0], IMAGE_SYM_TYPE); + syms[0].sym.e_sclass[0] = IMAGE_SYM_CLASS_FILE; + syms[0].sym.e_numaux[0] = 1; + /* The name need not be nul-terminated if it fits into the x_fname field + directly, but must be if it has to be placed into the string table. */ + sflen = strlen (source_filename); + if (sflen <= E_FILNMLEN) + memcpy (&syms[1].aux.x_file.x_fname[0], source_filename, sflen); + else + { + set_32 (&syms[1].aux.x_file.x_n.x_offset[0], name_offset); + if (!simple_object_internal_write (descriptor, offset + name_offset, + ((const unsigned char *) + source_filename), + sflen + 1, &errmsg, err)) + return errmsg; + name_offset += strlen (source_filename) + 1; + } + if (!simple_object_internal_write (descriptor, symtab_offset, + (const unsigned char *) &syms[0], + sizeof (syms), &errmsg, err)) return errmsg; - name_offset += strlen (source_filename) + 1; - } - if (!simple_object_internal_write (descriptor, symtab_offset, - (const unsigned char *) &syms[0], - sizeof (syms), &errmsg, err)) - return errmsg; - - /* Write the string table length, followed by the strings and section - symbols in step with each other. */ - set_32 (strsizebuf, name_offset); - if (!simple_object_internal_write (descriptor, offset, strsizebuf, 4, - &errmsg, err)) - return errmsg; - name_offset = 4; - secsym_offset = symtab_offset + sizeof (syms); - memset (&syms[0], 0, sizeof (syms)); - set_16 (&syms[0].sym.e_type[0], IMAGE_SYM_TYPE); - syms[0].sym.e_sclass[0] = IMAGE_SYM_CLASS_STATIC; - syms[0].sym.e_numaux[0] = 1; - secnum = 1; + /* Write the string table length, followed by the strings and section + symbols in step with each other. */ + set_32 (strsizebuf, name_offset); + if (!simple_object_internal_write (descriptor, offset, strsizebuf, 4, + &errmsg, err)) + return errmsg; - for (section = sobj->sections; section != NULL; section = section->next) - { - size_t namelen; - size_t scnsize; - struct simple_object_write_section_buffer *buffer; + name_offset = 4; + secsym_offset = symtab_offset + sizeof (syms); + memset (&syms[0], 0, sizeof (syms)); + set_16 (&syms[0].sym.e_type[0], IMAGE_SYM_TYPE); + syms[0].sym.e_sclass[0] = IMAGE_SYM_CLASS_STATIC; + syms[0].sym.e_numaux[0] = 1; + secnum = 1; - namelen = strlen (section->name); - set_16 (&syms[0].sym.e_scnum[0], secnum++); - scnsize = 0; - for (buffer = section->buffers; buffer != NULL; buffer = buffer->next) - scnsize += buffer->size; - set_32 (&syms[1].aux.x_scn.x_scnlen[0], scnsize); - if (namelen > SCNNMLEN) + for (section = sobj->sections; section != NULL; section = section->next) { - set_32 (&syms[0].sym.e.e.e_zeroes[0], 0); - set_32 (&syms[0].sym.e.e.e_offset[0], name_offset); - if (!simple_object_internal_write (descriptor, offset + name_offset, - ((const unsigned char *) - section->name), - namelen + 1, &errmsg, err)) + size_t namelen; + size_t scnsize; + struct simple_object_write_section_buffer *buffer; + + namelen = strlen (section->name); + set_32 (&syms[0].sym.e_scnum[0], secnum++); + scnsize = 0; + for (buffer = section->buffers; buffer != NULL; buffer = buffer->next) + scnsize += buffer->size; + set_32 (&syms[1].aux.x_scn.x_scnlen[0], scnsize); + if (namelen > SCNNMLEN) + { + set_32 (&syms[0].sym.e.e.e_zeroes[0], 0); + set_32 (&syms[0].sym.e.e.e_offset[0], name_offset); + if (!simple_object_internal_write (descriptor, offset + name_offset, + ((const unsigned char *) + section->name), + namelen + 1, &errmsg, err)) + return errmsg; + name_offset += namelen + 1; + } + else + { + memcpy (&syms[0].sym.e.e_name[0], section->name, + strlen (section->name)); + memset (&syms[0].sym.e.e_name[strlen (section->name)], 0, + E_SYMNMLEN - strlen (section->name)); + } + + if (!simple_object_internal_write (descriptor, secsym_offset, + (const unsigned char *) &syms[0], + sizeof (syms), &errmsg, err)) return errmsg; - name_offset += namelen + 1; + secsym_offset += sizeof (syms); } + } + else + { + /* Regular COFF. */ + union + { + struct external_syment sym; + union external_auxent aux; + } syms[2]; + + memset (&syms[0], 0, sizeof (syms)); + strcpy ((char *)&syms[0].sym.e.e_name[0], ".file"); + set_16 (&syms[0].sym.e_scnum[0], IMAGE_SYM_DEBUG); + set_16 (&syms[0].sym.e_type[0], IMAGE_SYM_TYPE); + syms[0].sym.e_sclass[0] = IMAGE_SYM_CLASS_FILE; + syms[0].sym.e_numaux[0] = 1; + /* The name need not be nul-terminated if it fits into the x_fname field + directly, but must be if it has to be placed into the string table. */ + sflen = strlen (source_filename); + if (sflen <= E_FILNMLEN) + memcpy (&syms[1].aux.x_file.x_fname[0], source_filename, sflen); else { - memcpy (&syms[0].sym.e.e_name[0], section->name, - strlen (section->name)); - memset (&syms[0].sym.e.e_name[strlen (section->name)], 0, - E_SYMNMLEN - strlen (section->name)); + set_32 (&syms[1].aux.x_file.x_n.x_offset[0], name_offset); + if (!simple_object_internal_write (descriptor, offset + name_offset, + ((const unsigned char *) + source_filename), + sflen + 1, &errmsg, err)) + return errmsg; + name_offset += strlen (source_filename) + 1; } - - if (!simple_object_internal_write (descriptor, secsym_offset, + if (!simple_object_internal_write (descriptor, symtab_offset, (const unsigned char *) &syms[0], sizeof (syms), &errmsg, err)) return errmsg; - secsym_offset += sizeof (syms); + + /* Write the string table length, followed by the strings and section + symbols in step with each other. */ + set_32 (strsizebuf, name_offset); + if (!simple_object_internal_write (descriptor, offset, strsizebuf, 4, + &errmsg, err)) + return errmsg; + + name_offset = 4; + secsym_offset = symtab_offset + sizeof (syms); + memset (&syms[0], 0, sizeof (syms)); + set_16 (&syms[0].sym.e_type[0], IMAGE_SYM_TYPE); + syms[0].sym.e_sclass[0] = IMAGE_SYM_CLASS_STATIC; + syms[0].sym.e_numaux[0] = 1; + secnum = 1; + + for (section = sobj->sections; section != NULL; section = section->next) + { + size_t namelen; + size_t scnsize; + struct simple_object_write_section_buffer *buffer; + + namelen = strlen (section->name); + set_16 (&syms[0].sym.e_scnum[0], secnum++); + scnsize = 0; + for (buffer = section->buffers; buffer != NULL; buffer = buffer->next) + scnsize += buffer->size; + set_32 (&syms[1].aux.x_scn.x_scnlen[0], scnsize); + if (namelen > SCNNMLEN) + { + set_32 (&syms[0].sym.e.e.e_zeroes[0], 0); + set_32 (&syms[0].sym.e.e.e_offset[0], name_offset); + if (!simple_object_internal_write (descriptor, offset + name_offset, + ((const unsigned char *) + section->name), + namelen + 1, &errmsg, err)) + return errmsg; + name_offset += namelen + 1; + } + else + { + memcpy (&syms[0].sym.e.e_name[0], section->name, + strlen (section->name)); + memset (&syms[0].sym.e.e_name[strlen (section->name)], 0, + E_SYMNMLEN - strlen (section->name)); + } + + if (!simple_object_internal_write (descriptor, secsym_offset, + (const unsigned char *) &syms[0], + sizeof (syms), &errmsg, err)) + return errmsg; + secsym_offset += sizeof (syms); + } } - if (!simple_object_coff_write_filehdr (sobj, descriptor, nscns, - symtab_offset, nsyms, &errmsg, err)) - return errmsg; + if (attrs->is_bigobj) + { + if (!simple_object_coff_write_filehdr_bigobj (sobj, descriptor, nscns, + symtab_offset, nsyms, + &errmsg, err)) + return errmsg; + } + else + { + if (!simple_object_coff_write_filehdr (sobj, descriptor, nscns, + symtab_offset, nsyms, &errmsg, err)) + return errmsg; + } return NULL; } |