| /* simple-object-coff.c -- routines to manipulate COFF object files. |
| Copyright (C) 2010-2017 Free Software Foundation, Inc. |
| Written by Ian Lance Taylor, Google. |
| |
| 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 2, 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, 51 Franklin Street - Fifth Floor, |
| Boston, MA 02110-1301, USA. */ |
| |
| #include "config.h" |
| #include "libiberty.h" |
| #include "simple-object.h" |
| |
| #include <errno.h> |
| #include <stddef.h> |
| |
| #ifdef HAVE_STDLIB_H |
| #include <stdlib.h> |
| #endif |
| |
| #ifdef HAVE_STDINT_H |
| #include <stdint.h> |
| #endif |
| |
| #ifdef HAVE_STRING_H |
| #include <string.h> |
| #endif |
| |
| #ifdef HAVE_INTTYPES_H |
| #include <inttypes.h> |
| #endif |
| |
| #include "simple-object-common.h" |
| |
| /* COFF structures and constants. */ |
| |
| /* COFF file header. */ |
| |
| struct external_filehdr |
| { |
| unsigned char f_magic[2]; /* magic number */ |
| unsigned char f_nscns[2]; /* number of sections */ |
| unsigned char f_timdat[4]; /* time & date stamp */ |
| unsigned char f_symptr[4]; /* file pointer to symtab */ |
| unsigned char f_nsyms[4]; /* number of symtab entries */ |
| unsigned char f_opthdr[2]; /* sizeof(optional hdr) */ |
| unsigned char f_flags[2]; /* flags */ |
| }; |
| |
| /* Bits for filehdr f_flags field. */ |
| |
| #define F_EXEC (0x0002) |
| #define IMAGE_FILE_SYSTEM (0x1000) |
| #define IMAGE_FILE_DLL (0x2000) |
| |
| /* COFF section header. */ |
| |
| struct external_scnhdr |
| { |
| unsigned char s_name[8]; /* section name */ |
| unsigned char s_paddr[4]; /* physical address, aliased s_nlib */ |
| unsigned char s_vaddr[4]; /* virtual address */ |
| unsigned char s_size[4]; /* section size */ |
| unsigned char s_scnptr[4]; /* file ptr to raw data for section */ |
| unsigned char s_relptr[4]; /* file ptr to relocation */ |
| unsigned char s_lnnoptr[4]; /* file ptr to line numbers */ |
| unsigned char s_nreloc[2]; /* number of relocation entries */ |
| unsigned char s_nlnno[2]; /* number of line number entries */ |
| unsigned char s_flags[4]; /* flags */ |
| }; |
| |
| /* The length of the s_name field in struct external_scnhdr. */ |
| |
| #define SCNNMLEN (8) |
| |
| /* Bits for scnhdr s_flags field. This includes some bits defined |
| only for PE. This may need to be moved into coff_magic. */ |
| |
| #define STYP_DATA (1 << 6) |
| #define IMAGE_SCN_MEM_DISCARDABLE (1 << 25) |
| #define IMAGE_SCN_MEM_SHARED (1 << 28) |
| #define IMAGE_SCN_MEM_READ (1 << 30) |
| |
| #define IMAGE_SCN_ALIGN_POWER_BIT_POS 20 |
| #define IMAGE_SCN_ALIGN_POWER_CONST(val) \ |
| (((val) + 1) << IMAGE_SCN_ALIGN_POWER_BIT_POS) |
| |
| /* COFF symbol table entry. */ |
| |
| #define E_SYMNMLEN 8 /* # characters in a symbol name */ |
| |
| struct external_syment |
| { |
| 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[2]; |
| 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 |
| |
| /* Omits x_sym and other unused variants. */ |
| |
| union external_auxent |
| { |
| /* 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 */ |
| } x_scn; |
| }; |
| |
| /* Symbol-related constants. */ |
| |
| #define IMAGE_SYM_DEBUG (-2) |
| #define IMAGE_SYM_TYPE_NULL (0) |
| #define IMAGE_SYM_DTYPE_NULL (0) |
| #define IMAGE_SYM_CLASS_STATIC (3) |
| #define IMAGE_SYM_CLASS_FILE (103) |
| |
| #define IMAGE_SYM_TYPE \ |
| ((IMAGE_SYM_DTYPE_NULL << 4) | IMAGE_SYM_TYPE_NULL) |
| |
| /* Private data for an simple_object_read. */ |
| |
| struct simple_object_coff_read |
| { |
| /* Magic number. */ |
| unsigned short magic; |
| /* Whether the file is big-endian. */ |
| unsigned char is_big_endian; |
| /* Number of sections. */ |
| unsigned short nscns; |
| /* File offset of symbol table. */ |
| off_t symptr; |
| /* Number of symbol table entries. */ |
| unsigned int nsyms; |
| /* Flags. */ |
| unsigned short flags; |
| /* Offset of section headers in file. */ |
| off_t scnhdr_offset; |
| }; |
| |
| /* Private data for an simple_object_attributes. */ |
| |
| struct simple_object_coff_attributes |
| { |
| /* Magic number. */ |
| unsigned short magic; |
| /* Whether the file is big-endian. */ |
| unsigned char is_big_endian; |
| /* Flags. */ |
| unsigned short flags; |
| }; |
| |
| /* There is no magic number which indicates a COFF file as opposed to |
| any other sort of file. Instead, each COFF file starts with a |
| two-byte magic number which also indicates the type of the target. |
| This struct holds a magic number as well as characteristics of that |
| COFF format. */ |
| |
| struct coff_magic_struct |
| { |
| /* Magic number. */ |
| unsigned short magic; |
| /* Whether this magic number is for a big-endian file. */ |
| unsigned char is_big_endian; |
| /* Flag bits, in the f_flags fields, which indicates that this file |
| is not a relocatable object file. There is no flag which |
| specifically indicates a relocatable object file, it is only |
| implied by the absence of these flags. */ |
| unsigned short non_object_flags; |
| }; |
| |
| /* This is a list of the COFF magic numbers which we recognize, namely |
| the ones used on Windows. More can be added as needed. */ |
| |
| static const struct coff_magic_struct coff_magic[] = |
| { |
| /* i386. */ |
| { 0x14c, 0, F_EXEC | IMAGE_FILE_SYSTEM | IMAGE_FILE_DLL }, |
| /* x86_64. */ |
| { 0x8664, 0, F_EXEC | IMAGE_FILE_SYSTEM | IMAGE_FILE_DLL } |
| }; |
| |
| /* See if we have a COFF file. */ |
| |
| static void * |
| simple_object_coff_match (unsigned char header[SIMPLE_OBJECT_MATCH_HEADER_LEN], |
| int descriptor, off_t offset, |
| const char *segment_name ATTRIBUTE_UNUSED, |
| const char **errmsg, int *err) |
| { |
| size_t c; |
| unsigned short magic_big; |
| unsigned short magic_little; |
| unsigned short magic; |
| size_t i; |
| 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 short flags; |
| struct simple_object_coff_read *ocr; |
| |
| c = sizeof (coff_magic) / sizeof (coff_magic[0]); |
| magic_big = simple_object_fetch_big_16 (header); |
| magic_little = simple_object_fetch_little_16 (header); |
| for (i = 0; i < c; ++i) |
| { |
| if (coff_magic[i].is_big_endian |
| ? coff_magic[i].magic == magic_big |
| : coff_magic[i].magic == magic_little) |
| break; |
| } |
| if (i >= c) |
| { |
| *errmsg = NULL; |
| *err = 0; |
| return NULL; |
| } |
| is_big_endian = coff_magic[i].is_big_endian; |
| |
| magic = is_big_endian ? magic_big : magic_little; |
| fetch_16 = (is_big_endian |
| ? simple_object_fetch_big_16 |
| : simple_object_fetch_little_16); |
| fetch_32 = (is_big_endian |
| ? simple_object_fetch_big_32 |
| : simple_object_fetch_little_32); |
| |
| if (!simple_object_internal_read (descriptor, offset, hdrbuf, sizeof hdrbuf, |
| errmsg, err)) |
| return NULL; |
| |
| flags = fetch_16 (hdrbuf + offsetof (struct external_filehdr, f_flags)); |
| if ((flags & coff_magic[i].non_object_flags) != 0) |
| { |
| *errmsg = "not relocatable object file"; |
| *err = 0; |
| return NULL; |
| } |
| |
| ocr = XNEW (struct simple_object_coff_read); |
| ocr->magic = magic; |
| ocr->is_big_endian = is_big_endian; |
| ocr->nscns = fetch_16 (hdrbuf + offsetof (struct external_filehdr, f_nscns)); |
| ocr->symptr = fetch_32 (hdrbuf |
| + offsetof (struct external_filehdr, f_symptr)); |
| ocr->nsyms = fetch_32 (hdrbuf + offsetof (struct external_filehdr, f_nsyms)); |
| ocr->flags = flags; |
| ocr->scnhdr_offset = (sizeof (struct external_filehdr) |
| + fetch_16 (hdrbuf + offsetof (struct external_filehdr, |
| f_opthdr))); |
| |
| return (void *) ocr; |
| } |
| |
| /* Read the string table in a COFF file. */ |
| |
| static char * |
| simple_object_coff_read_strtab (simple_object_read *sobj, size_t *strtab_size, |
| const char **errmsg, int *err) |
| { |
| struct simple_object_coff_read *ocr = |
| (struct simple_object_coff_read *) sobj->data; |
| off_t strtab_offset; |
| unsigned char strsizebuf[4]; |
| size_t strsize; |
| char *strtab; |
| |
| strtab_offset = sobj->offset + ocr->symptr |
| + ocr->nsyms * sizeof (struct external_syment); |
| if (!simple_object_internal_read (sobj->descriptor, strtab_offset, |
| strsizebuf, 4, errmsg, err)) |
| return NULL; |
| strsize = (ocr->is_big_endian |
| ? simple_object_fetch_big_32 (strsizebuf) |
| : simple_object_fetch_little_32 (strsizebuf)); |
| strtab = XNEWVEC (char, strsize); |
| if (!simple_object_internal_read (sobj->descriptor, strtab_offset, |
| (unsigned char *) strtab, strsize, errmsg, |
| err)) |
| { |
| XDELETEVEC (strtab); |
| return NULL; |
| } |
| *strtab_size = strsize; |
| return strtab; |
| } |
| |
| /* Find all sections in a COFF file. */ |
| |
| static const char * |
| simple_object_coff_find_sections (simple_object_read *sobj, |
| int (*pfn) (void *, const char *, |
| off_t offset, off_t length), |
| void *data, |
| int *err) |
| { |
| struct simple_object_coff_read *ocr = |
| (struct simple_object_coff_read *) sobj->data; |
| size_t scnhdr_size; |
| unsigned char *scnbuf; |
| const char *errmsg; |
| unsigned int (*fetch_32) (const unsigned char *); |
| unsigned int nscns; |
| char *strtab; |
| size_t strtab_size; |
| unsigned int i; |
| |
| scnhdr_size = sizeof (struct external_scnhdr); |
| scnbuf = XNEWVEC (unsigned char, scnhdr_size * ocr->nscns); |
| if (!simple_object_internal_read (sobj->descriptor, |
| sobj->offset + ocr->scnhdr_offset, |
| scnbuf, scnhdr_size * ocr->nscns, &errmsg, |
| err)) |
| { |
| XDELETEVEC (scnbuf); |
| return errmsg; |
| } |
| |
| fetch_32 = (ocr->is_big_endian |
| ? simple_object_fetch_big_32 |
| : simple_object_fetch_little_32); |
| |
| nscns = ocr->nscns; |
| strtab = NULL; |
| strtab_size = 0; |
| for (i = 0; i < nscns; ++i) |
| { |
| unsigned char *scnhdr; |
| unsigned char *scnname; |
| char namebuf[SCNNMLEN + 1]; |
| char *name; |
| off_t scnptr; |
| unsigned int size; |
| |
| scnhdr = scnbuf + i * scnhdr_size; |
| scnname = scnhdr + offsetof (struct external_scnhdr, s_name); |
| memcpy (namebuf, scnname, SCNNMLEN); |
| namebuf[SCNNMLEN] = '\0'; |
| name = &namebuf[0]; |
| if (namebuf[0] == '/') |
| { |
| size_t strindex; |
| char *end; |
| |
| strindex = strtol (namebuf + 1, &end, 10); |
| if (*end == '\0') |
| { |
| /* The real section name is found in the string |
| table. */ |
| if (strtab == NULL) |
| { |
| strtab = simple_object_coff_read_strtab (sobj, |
| &strtab_size, |
| &errmsg, err); |
| if (strtab == NULL) |
| { |
| XDELETEVEC (scnbuf); |
| return errmsg; |
| } |
| } |
| |
| if (strindex < 4 || strindex >= strtab_size) |
| { |
| XDELETEVEC (strtab); |
| XDELETEVEC (scnbuf); |
| *err = 0; |
| return "section string index out of range"; |
| } |
| |
| name = strtab + strindex; |
| } |
| } |
| |
| scnptr = fetch_32 (scnhdr + offsetof (struct external_scnhdr, s_scnptr)); |
| size = fetch_32 (scnhdr + offsetof (struct external_scnhdr, s_size)); |
| |
| if (!(*pfn) (data, name, scnptr, size)) |
| break; |
| } |
| |
| if (strtab != NULL) |
| XDELETEVEC (strtab); |
| XDELETEVEC (scnbuf); |
| |
| return NULL; |
| } |
| |
| /* Fetch the attributes for an simple_object_read. */ |
| |
| static void * |
| simple_object_coff_fetch_attributes (simple_object_read *sobj, |
| const char **errmsg ATTRIBUTE_UNUSED, |
| int *err ATTRIBUTE_UNUSED) |
| { |
| struct simple_object_coff_read *ocr = |
| (struct simple_object_coff_read *) sobj->data; |
| struct simple_object_coff_attributes *ret; |
| |
| ret = XNEW (struct simple_object_coff_attributes); |
| ret->magic = ocr->magic; |
| ret->is_big_endian = ocr->is_big_endian; |
| ret->flags = ocr->flags; |
| return ret; |
| } |
| |
| /* Release the private data for an simple_object_read. */ |
| |
| static void |
| simple_object_coff_release_read (void *data) |
| { |
| XDELETE (data); |
| } |
| |
| /* Compare two attributes structures. */ |
| |
| static const char * |
| simple_object_coff_attributes_merge (void *todata, void *fromdata, int *err) |
| { |
| struct simple_object_coff_attributes *to = |
| (struct simple_object_coff_attributes *) todata; |
| 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) |
| { |
| *err = 0; |
| return "COFF object format mismatch"; |
| } |
| return NULL; |
| } |
| |
| /* Release the private data for an attributes structure. */ |
| |
| static void |
| simple_object_coff_release_attributes (void *data) |
| { |
| XDELETE (data); |
| } |
| |
| /* Prepare to write out a file. */ |
| |
| static void * |
| simple_object_coff_start_write (void *attributes_data, |
| const char **errmsg ATTRIBUTE_UNUSED, |
| int *err ATTRIBUTE_UNUSED) |
| { |
| struct simple_object_coff_attributes *attrs = |
| (struct simple_object_coff_attributes *) attributes_data; |
| struct simple_object_coff_attributes *ret; |
| |
| /* We're just going to record the attributes, but we need to make a |
| copy because the user may delete them. */ |
| ret = XNEW (struct simple_object_coff_attributes); |
| *ret = *attrs; |
| return ret; |
| } |
| |
| /* Write out a COFF filehdr. */ |
| |
| static int |
| simple_object_coff_write_filehdr (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)]; |
| unsigned char *hdr; |
| void (*set_16) (unsigned char *, unsigned short); |
| void (*set_32) (unsigned char *, unsigned int); |
| |
| hdr = &hdrbuf[0]; |
| |
| set_16 = (attrs->is_big_endian |
| ? simple_object_set_big_16 |
| : simple_object_set_little_16); |
| set_32 = (attrs->is_big_endian |
| ? simple_object_set_big_32 |
| : simple_object_set_little_32); |
| |
| memset (hdr, 0, sizeof (struct external_filehdr)); |
| |
| set_16 (hdr + offsetof (struct external_filehdr, f_magic), attrs->magic); |
| set_16 (hdr + offsetof (struct external_filehdr, f_nscns), nscns); |
| /* f_timdat left as zero. */ |
| set_32 (hdr + offsetof (struct external_filehdr, f_symptr), symtab_offset); |
| set_32 (hdr + offsetof (struct external_filehdr, f_nsyms), nsyms); |
| /* f_opthdr left as zero. */ |
| set_16 (hdr + offsetof (struct external_filehdr, f_flags), attrs->flags); |
| |
| return simple_object_internal_write (descriptor, 0, hdrbuf, |
| sizeof (struct external_filehdr), |
| errmsg, err); |
| } |
| |
| /* Write out a COFF section header. */ |
| |
| static int |
| simple_object_coff_write_scnhdr (simple_object_write *sobj, int descriptor, |
| const char *name, size_t *name_offset, |
| off_t scnhdr_offset, size_t scnsize, |
| off_t offset, unsigned int align, |
| const char **errmsg, int *err) |
| { |
| struct simple_object_coff_attributes *attrs = |
| (struct simple_object_coff_attributes *) sobj->data; |
| void (*set_32) (unsigned char *, unsigned int); |
| unsigned char hdrbuf[sizeof (struct external_scnhdr)]; |
| unsigned char *hdr; |
| size_t namelen; |
| unsigned int flags; |
| |
| set_32 = (attrs->is_big_endian |
| ? simple_object_set_big_32 |
| : simple_object_set_little_32); |
| |
| memset (hdrbuf, 0, sizeof hdrbuf); |
| hdr = &hdrbuf[0]; |
| |
| namelen = strlen (name); |
| if (namelen <= SCNNMLEN) |
| strncpy ((char *) hdr + offsetof (struct external_scnhdr, s_name), name, |
| SCNNMLEN); |
| else |
| { |
| snprintf ((char *) hdr + offsetof (struct external_scnhdr, s_name), |
| SCNNMLEN, "/%lu", (unsigned long) *name_offset); |
| *name_offset += namelen + 1; |
| } |
| |
| /* s_paddr left as zero. */ |
| /* s_vaddr left as zero. */ |
| set_32 (hdr + offsetof (struct external_scnhdr, s_size), scnsize); |
| set_32 (hdr + offsetof (struct external_scnhdr, s_scnptr), offset); |
| /* s_relptr left as zero. */ |
| /* s_lnnoptr left as zero. */ |
| /* s_nreloc left as zero. */ |
| /* s_nlnno left as zero. */ |
| flags = (STYP_DATA | IMAGE_SCN_MEM_DISCARDABLE | IMAGE_SCN_MEM_SHARED |
| | IMAGE_SCN_MEM_READ); |
| /* PE can represent alignment up to 13. */ |
| if (align > 13) |
| align = 13; |
| flags |= IMAGE_SCN_ALIGN_POWER_CONST(align); |
| set_32 (hdr + offsetof (struct external_scnhdr, s_flags), flags); |
| |
| return simple_object_internal_write (descriptor, scnhdr_offset, hdrbuf, |
| sizeof (struct external_scnhdr), |
| errmsg, err); |
| } |
| |
| /* Write out a complete COFF file. */ |
| |
| static const char * |
| simple_object_coff_write_to_file (simple_object_write *sobj, int descriptor, |
| int *err) |
| { |
| struct simple_object_coff_attributes *attrs = |
| (struct simple_object_coff_attributes *) sobj->data; |
| unsigned int nscns, secnum; |
| simple_object_write_section *section; |
| off_t scnhdr_offset; |
| size_t symtab_offset; |
| off_t secsym_offset; |
| unsigned int nsyms; |
| size_t offset; |
| size_t name_offset; |
| const char *errmsg; |
| unsigned char strsizebuf[4]; |
| /* The interface doesn't give us access to the name of the input file |
| yet. We want to use its basename for the FILE symbol. This is |
| 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]; |
| void (*set_16) (unsigned char *, unsigned short); |
| void (*set_32) (unsigned char *, unsigned int); |
| |
| set_16 = (attrs->is_big_endian |
| ? simple_object_set_big_16 |
| : simple_object_set_little_16); |
| set_32 = (attrs->is_big_endian |
| ? simple_object_set_big_32 |
| : simple_object_set_little_32); |
| |
| nscns = 0; |
| for (section = sobj->sections; section != NULL; section = section->next) |
| ++nscns; |
| |
| 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) |
| { |
| size_t mask; |
| size_t new_offset; |
| size_t scnsize; |
| struct simple_object_write_section_buffer *buffer; |
| |
| mask = (1U << section->align) - 1; |
| new_offset = offset & mask; |
| new_offset &= ~ mask; |
| while (new_offset > offset) |
| { |
| unsigned char zeroes[16]; |
| size_t write; |
| |
| memset (zeroes, 0, sizeof zeroes); |
| write = new_offset - offset; |
| if (write > sizeof zeroes) |
| write = sizeof zeroes; |
| if (!simple_object_internal_write (descriptor, offset, zeroes, write, |
| &errmsg, err)) |
| return errmsg; |
| } |
| |
| scnsize = 0; |
| for (buffer = section->buffers; buffer != NULL; buffer = buffer->next) |
| { |
| if (!simple_object_internal_write (descriptor, offset + scnsize, |
| ((const unsigned char *) |
| buffer->buffer), |
| buffer->size, &errmsg, err)) |
| return errmsg; |
| scnsize += buffer->size; |
| } |
| |
| if (!simple_object_coff_write_scnhdr (sobj, descriptor, section->name, |
| &name_offset, scnhdr_offset, |
| scnsize, offset, section->align, |
| &errmsg, err)) |
| return errmsg; |
| |
| scnhdr_offset += sizeof (struct external_scnhdr); |
| offset += scnsize; |
| } |
| |
| /* Symbol table is always half-word aligned. */ |
| offset += (offset & 1); |
| /* There is a file symbol and a section symbol per section, |
| and each of these has a single auxiliary symbol following. */ |
| nsyms = 2 * (nscns + 1); |
| symtab_offset = offset; |
| /* Advance across space reserved for symbol table to locate |
| start of string table. */ |
| offset += nsyms * sizeof (struct external_syment); |
| |
| /* 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 |
| { |
| 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; |
| |
| /* 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; |
| |
| return NULL; |
| } |
| |
| /* Release the private data for an simple_object_write structure. */ |
| |
| static void |
| simple_object_coff_release_write (void *data) |
| { |
| XDELETE (data); |
| } |
| |
| /* The COFF functions. */ |
| |
| const struct simple_object_functions simple_object_coff_functions = |
| { |
| simple_object_coff_match, |
| simple_object_coff_find_sections, |
| simple_object_coff_fetch_attributes, |
| simple_object_coff_release_read, |
| simple_object_coff_attributes_merge, |
| simple_object_coff_release_attributes, |
| simple_object_coff_start_write, |
| simple_object_coff_write_to_file, |
| simple_object_coff_release_write |
| }; |