| /* simple-object-coff.c -- routines to manipulate XCOFF object files. |
| Copyright (C) 2013-2019 Free Software Foundation, Inc. |
| Written by Ian Lance Taylor, Google and David Edelsohn, IBM. |
| |
| 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" |
| |
| /* XCOFF structures and constants. */ |
| |
| /* XCOFF 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 */ |
| union |
| { |
| struct |
| { |
| 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 */ |
| } xcoff32; |
| struct |
| { |
| unsigned char f_symptr[8]; /* file pointer to symtab */ |
| unsigned char f_opthdr[2]; /* sizeof(optional hdr) */ |
| unsigned char f_flags[2]; /* flags */ |
| unsigned char f_nsyms[4]; /* number of symtab entries */ |
| } xcoff64; |
| } u; |
| }; |
| |
| /* Bits for filehdr f_flags field. */ |
| |
| #define F_EXEC (0x0002) |
| |
| /* The known values of f_magic in an XCOFF file header. */ |
| |
| #define U802WRMAGIC 0730 /* Writeable text segments. */ |
| #define U802ROMAGIC 0735 /* Readonly sharable text segments. */ |
| #define U802TOCMAGIC 0737 /* Readonly text segments and TOC. */ |
| #define U803XTOCMAGIC 0757 /* Aix 4.3 64-bit XCOFF. */ |
| #define U64_TOCMAGIC 0767 /* AIX 5+ 64-bit XCOFF. */ |
| |
| /* XCOFF section header. */ |
| |
| struct external_scnhdr |
| { |
| unsigned char s_name[8]; /* section name */ |
| union |
| { |
| struct |
| { |
| 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 */ |
| } xcoff32; |
| struct |
| { |
| unsigned char s_paddr[8]; /* physical address, aliased s_nlib */ |
| unsigned char s_vaddr[8]; /* virtual address */ |
| unsigned char s_size[8]; /* section size */ |
| unsigned char s_scnptr[8]; /* file ptr to raw data for section */ |
| unsigned char s_relptr[8]; /* file ptr to relocation */ |
| unsigned char s_lnnoptr[8]; /* file ptr to line numbers */ |
| unsigned char s_nreloc[4]; /* number of relocation entries */ |
| unsigned char s_nlnno[4]; /* number of line number entries */ |
| unsigned char s_flags[4]; /* flags */ |
| } xcoff64; |
| } u; |
| }; |
| |
| #define SCNHSZ32 (40) |
| #define SCNHSZ64 (68) |
| |
| /* The length of the s_name field in struct external_scnhdr. */ |
| |
| #define SCNNMLEN (8) |
| |
| /* Bits for scnhdr s_flags field. */ |
| |
| #define STYP_DATA 0x40 |
| |
| /* XCOFF symbol table entry. */ |
| |
| |
| #define N_SYMNMLEN (8) /* # characters in a symbol name */ |
| |
| /* The format of an XCOFF symbol-table entry. */ |
| struct external_syment |
| { |
| union { |
| struct { |
| union { |
| /* The name of the symbol. There is an implicit null character |
| after the end of the array. */ |
| char n_name[N_SYMNMLEN]; |
| struct { |
| /* If n_zeroes is zero, n_offset is the offset the name from |
| the start of the string table. */ |
| unsigned char n_zeroes[4]; |
| unsigned char n_offset[4]; |
| } n; |
| } n; |
| |
| /* The symbol's value. */ |
| unsigned char n_value[4]; |
| } xcoff32; |
| struct { |
| /* The symbol's value. */ |
| unsigned char n_value[8]; |
| |
| /* The offset of the symbol from the start of the string table. */ |
| unsigned char n_offset[4]; |
| } xcoff64; |
| } u; |
| |
| /* The number of the section to which this symbol belongs. */ |
| unsigned char n_scnum[2]; |
| |
| /* The type of symbol. (It can be interpreted as an n_lang |
| and an n_cpu byte, but we don't care about that here.) */ |
| unsigned char n_type[2]; |
| |
| /* The class of symbol (a C_* value). */ |
| unsigned char n_sclass[1]; |
| |
| /* The number of auxiliary symbols attached to this entry. */ |
| unsigned char n_numaux[1]; |
| }; |
| |
| #define SYMESZ (18) |
| |
| /* Length allowed for filename in aux sym format 4. */ |
| |
| #define FILNMLEN (14) |
| |
| /* Omits x_sym and other unused variants. */ |
| |
| union external_auxent |
| { |
| /* Aux sym format 4: file. */ |
| union |
| { |
| char x_fname[FILNMLEN]; |
| struct |
| { |
| unsigned char x_zeroes[4]; |
| unsigned char x_offset[4]; |
| unsigned char x_pad[FILNMLEN-8]; |
| unsigned char x_ftype; |
| } _x; |
| } 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 */ |
| } x_scn; |
| /* CSECT auxiliary entry. */ |
| union |
| { |
| struct |
| { |
| struct |
| { |
| unsigned char x_scnlen[4]; /* csect length */ |
| unsigned char x_parmhash[4]; /* parm type hash index */ |
| unsigned char x_snhash[2]; /* sect num with parm hash */ |
| unsigned char x_smtyp; /* symbol align and type */ |
| unsigned char x_smclas; /* storage mapping class */ |
| unsigned char x_stab; /* dbx stab info index */ |
| unsigned char x_snstab[2]; /* sect num with dbx stab */ |
| } x_csect; |
| } xcoff32; |
| struct |
| { |
| struct |
| { |
| unsigned char x_scnlen_lo[4]; /* csect length */ |
| unsigned char x_parmhash[4]; /* parm type hash index */ |
| unsigned char x_snhash[2]; /* sect num with parm hash */ |
| unsigned char x_smtyp; /* symbol align and type */ |
| unsigned char x_smclas; /* storage mapping class */ |
| unsigned char x_scnlen_hi[4]; |
| unsigned char pad; |
| unsigned char x_auxtype; |
| } x_csect; |
| } xcoff64; |
| } u; |
| /* SECTION/DWARF auxiliary entry. */ |
| struct |
| { |
| unsigned char x_scnlen[4]; /* section length */ |
| unsigned char pad1[4]; |
| unsigned char x_nreloc[4]; /* number RLDs */ |
| } x_sect; |
| }; |
| |
| /* Symbol-related constants. */ |
| |
| #define N_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) |
| |
| #define C_EXT (2) |
| #define C_STAT (3) |
| #define C_FILE (103) |
| #define C_HIDEXT (107) |
| |
| #define XTY_SD (1) /* section definition */ |
| |
| #define XMC_XO (7) /* extended operation */ |
| |
| /* Private data for an simple_object_read. */ |
| |
| struct simple_object_xcoff_read |
| { |
| /* Magic number. */ |
| unsigned short magic; |
| /* 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_xcoff_attributes |
| { |
| /* Magic number. */ |
| unsigned short magic; |
| /* Flags. */ |
| unsigned short flags; |
| }; |
| |
| /* See if we have a XCOFF file. */ |
| |
| static void * |
| simple_object_xcoff_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) |
| { |
| unsigned short magic; |
| unsigned short (*fetch_16) (const unsigned char *); |
| unsigned int (*fetch_32) (const unsigned char *); |
| ulong_type (*fetch_64) (const unsigned char *); |
| unsigned char hdrbuf[sizeof (struct external_filehdr)]; |
| struct simple_object_xcoff_read *ocr; |
| int u64; |
| |
| magic = simple_object_fetch_big_16 (header); |
| |
| if (magic != U802TOCMAGIC && magic != U64_TOCMAGIC) |
| { |
| *errmsg = NULL; |
| *err = 0; |
| return NULL; |
| } |
| |
| fetch_16 = simple_object_fetch_big_16; |
| fetch_32 = simple_object_fetch_big_32; |
| fetch_64 = simple_object_fetch_big_64; |
| |
| if (!simple_object_internal_read (descriptor, offset, hdrbuf, sizeof hdrbuf, |
| errmsg, err)) |
| return NULL; |
| |
| u64 = magic == U64_TOCMAGIC; |
| |
| ocr = XNEW (struct simple_object_xcoff_read); |
| ocr->magic = magic; |
| ocr->nscns = fetch_16 (hdrbuf + offsetof (struct external_filehdr, f_nscns)); |
| if (u64) |
| { |
| ocr->symptr = fetch_64 (hdrbuf |
| + offsetof (struct external_filehdr, |
| u.xcoff64.f_symptr)); |
| ocr->nsyms = fetch_32 (hdrbuf + offsetof (struct external_filehdr, |
| u.xcoff64.f_nsyms)); |
| ocr->scnhdr_offset = (sizeof (struct external_filehdr) |
| + fetch_16 (hdrbuf + offsetof (struct external_filehdr, |
| u.xcoff64.f_opthdr))); |
| |
| } |
| else |
| { |
| ocr->symptr = fetch_32 (hdrbuf |
| + offsetof (struct external_filehdr, |
| u.xcoff32.f_symptr)); |
| ocr->nsyms = fetch_32 (hdrbuf + offsetof (struct external_filehdr, |
| u.xcoff32.f_nsyms)); |
| ocr->scnhdr_offset = (sizeof (struct external_filehdr) - 4 |
| + fetch_16 (hdrbuf + offsetof (struct external_filehdr, |
| u.xcoff32.f_opthdr))); |
| |
| } |
| |
| return (void *) ocr; |
| } |
| |
| /* Read the string table in a XCOFF file. */ |
| |
| static char * |
| simple_object_xcoff_read_strtab (simple_object_read *sobj, size_t *strtab_size, |
| const char **errmsg, int *err) |
| { |
| struct simple_object_xcoff_read *ocr = |
| (struct simple_object_xcoff_read *) sobj->data; |
| off_t strtab_offset; |
| unsigned char strsizebuf[4]; |
| size_t strsize; |
| char *strtab; |
| |
| strtab_offset = sobj->offset + ocr->symptr |
| + ocr->nsyms * SYMESZ; |
| if (!simple_object_internal_read (sobj->descriptor, strtab_offset, |
| strsizebuf, 4, errmsg, err)) |
| return NULL; |
| strsize = simple_object_fetch_big_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 XCOFF file. */ |
| |
| static const char * |
| simple_object_xcoff_find_sections (simple_object_read *sobj, |
| int (*pfn) (void *, const char *, |
| off_t offset, off_t length), |
| void *data, |
| int *err) |
| { |
| struct simple_object_xcoff_read *ocr = |
| (struct simple_object_xcoff_read *) sobj->data; |
| int u64 = ocr->magic == U64_TOCMAGIC; |
| size_t scnhdr_size; |
| unsigned char *scnbuf; |
| const char *errmsg; |
| unsigned short (*fetch_16) (const unsigned char *); |
| unsigned int (*fetch_32) (const unsigned char *); |
| ulong_type (*fetch_64) (const unsigned char *); |
| unsigned int nscns; |
| char *strtab; |
| size_t strtab_size; |
| struct external_syment *symtab = NULL; |
| unsigned int i; |
| |
| scnhdr_size = u64 ? SCNHSZ64 : SCNHSZ32; |
| 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_16 = simple_object_fetch_big_16; |
| fetch_32 = simple_object_fetch_big_32; |
| fetch_64 = simple_object_fetch_big_64; |
| |
| 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; |
| off_t 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_xcoff_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; |
| } |
| } |
| |
| if (u64) |
| { |
| scnptr = fetch_64 (scnhdr + offsetof (struct external_scnhdr, |
| u.xcoff64.s_scnptr)); |
| size = fetch_64 (scnhdr + offsetof (struct external_scnhdr, |
| u.xcoff64.s_size)); |
| } |
| else |
| { |
| scnptr = fetch_32 (scnhdr + offsetof (struct external_scnhdr, |
| u.xcoff32.s_scnptr)); |
| size = fetch_32 (scnhdr + offsetof (struct external_scnhdr, |
| u.xcoff32.s_size)); |
| } |
| |
| if (!(*pfn) (data, name, scnptr, size)) |
| break; |
| } |
| |
| /* Special handling for .go_export csect. */ |
| if (ocr->nsyms > 0) |
| { |
| unsigned char *sym; |
| const char *n_name; |
| off_t size, n_value; |
| unsigned int n_numaux, n_offset, n_zeroes; |
| short n_scnum; |
| |
| /* Read symbol table. */ |
| symtab = XNEWVEC (struct external_syment, ocr->nsyms * SYMESZ); |
| if (!simple_object_internal_read (sobj->descriptor, |
| sobj->offset + ocr->symptr, |
| (unsigned char *) symtab, |
| ocr->nsyms * SYMESZ, |
| &errmsg, err)) |
| { |
| XDELETEVEC (symtab); |
| XDELETEVEC (scnbuf); |
| return NULL; |
| } |
| |
| /* Search in symbol table if we have a ".go_export" symbol. */ |
| for (i = 0; i < ocr->nsyms; i += n_numaux + 1) |
| { |
| sym = (unsigned char *) &symtab[i]; |
| n_numaux = symtab[i].n_numaux[0]; |
| |
| if (symtab[i].n_sclass[0] != C_EXT |
| && symtab[i].n_sclass[0] != C_HIDEXT) |
| continue; |
| |
| /* Must have at least one csect auxiliary entry. */ |
| if (n_numaux < 1 || i + n_numaux >= ocr->nsyms) |
| continue; |
| |
| n_scnum = fetch_16 (sym + offsetof (struct external_syment, |
| n_scnum)); |
| if (n_scnum < 1 || (unsigned int) n_scnum > nscns) |
| continue; |
| |
| if (u64) |
| { |
| n_value = fetch_64 (sym + offsetof (struct external_syment, |
| u.xcoff64.n_value)); |
| n_offset = fetch_32 (sym + offsetof (struct external_syment, |
| u.xcoff64.n_offset)); |
| } |
| else |
| { |
| /* ".go_export" is longer than N_SYMNMLEN. */ |
| n_zeroes = fetch_32 (sym + offsetof (struct external_syment, |
| u.xcoff32.n.n.n_zeroes)); |
| if (n_zeroes != 0) |
| continue; |
| |
| n_value = fetch_32 (sym + offsetof (struct external_syment, |
| u.xcoff32.n_value)); |
| n_offset = fetch_32 (sym + offsetof (struct external_syment, |
| u.xcoff32.n.n.n_offset)); |
| } |
| |
| /* The real symbol name is found in the string table. */ |
| if (strtab == NULL) |
| { |
| strtab = simple_object_xcoff_read_strtab (sobj, |
| &strtab_size, |
| &errmsg, err); |
| if (strtab == NULL) |
| { |
| XDELETEVEC (symtab); |
| XDELETEVEC (scnbuf); |
| return errmsg; |
| } |
| } |
| |
| if (n_offset >= strtab_size) |
| { |
| XDELETEVEC (strtab); |
| XDELETEVEC (symtab); |
| XDELETEVEC (scnbuf); |
| *err = 0; |
| return "symbol string index out of range"; |
| } |
| n_name = strtab + n_offset; |
| |
| if (!strcmp (n_name, ".go_export")) |
| { |
| union external_auxent *auxent; |
| unsigned char *aux, *scnhdr; |
| off_t scnptr, x_scnlen; |
| |
| /* Found .go_export symbol, read its csect auxiliary entry. |
| By convention, it is the last auxiliary entry. */ |
| auxent = (union external_auxent *) &symtab[i + n_numaux]; |
| aux = (unsigned char *) auxent; |
| if (u64) |
| { |
| /* Use an intermediate 64-bit type to avoid |
| compilation warning about 32-bit shift below on |
| hosts with 32-bit off_t which aren't supported by |
| AC_SYS_LARGEFILE. */ |
| ulong_type x_scnlen64; |
| |
| if ((auxent->u.xcoff64.x_csect.x_smtyp & 0x7) != XTY_SD |
| || auxent->u.xcoff64.x_csect.x_smclas != XMC_XO) |
| continue; |
| |
| x_scnlen64 = |
| fetch_32 (aux + offsetof (union external_auxent, |
| u.xcoff64.x_csect.x_scnlen_hi)); |
| x_scnlen = |
| ((x_scnlen64 << 32) |
| | fetch_32 (aux |
| + offsetof (union external_auxent, |
| u.xcoff64.x_csect.x_scnlen_lo))); |
| } |
| else |
| { |
| if ((auxent->u.xcoff32.x_csect.x_smtyp & 0x7) != XTY_SD |
| || auxent->u.xcoff32.x_csect.x_smclas != XMC_XO) |
| continue; |
| |
| x_scnlen = fetch_32 (aux + offsetof (union external_auxent, |
| u.xcoff32.x_csect.x_scnlen)); |
| } |
| |
| /* Get header of containing section. */ |
| scnhdr = scnbuf + (n_scnum - 1) * scnhdr_size; |
| if (u64) |
| { |
| scnptr = fetch_64 (scnhdr + offsetof (struct external_scnhdr, |
| u.xcoff64.s_scnptr)); |
| size = fetch_64 (scnhdr + offsetof (struct external_scnhdr, |
| u.xcoff64.s_size)); |
| } |
| else |
| { |
| scnptr = fetch_32 (scnhdr + offsetof (struct external_scnhdr, |
| u.xcoff32.s_scnptr)); |
| size = fetch_32 (scnhdr + offsetof (struct external_scnhdr, |
| u.xcoff32.s_size)); |
| } |
| if (n_value + x_scnlen > size) |
| break; |
| |
| (*pfn) (data, ".go_export", scnptr + n_value, x_scnlen); |
| break; |
| } |
| } |
| } |
| |
| if (symtab != NULL) |
| XDELETEVEC (symtab); |
| if (strtab != NULL) |
| XDELETEVEC (strtab); |
| XDELETEVEC (scnbuf); |
| |
| return NULL; |
| } |
| |
| /* Fetch the attributes for an simple_object_read. */ |
| |
| static void * |
| simple_object_xcoff_fetch_attributes (simple_object_read *sobj, |
| const char **errmsg ATTRIBUTE_UNUSED, |
| int *err ATTRIBUTE_UNUSED) |
| { |
| struct simple_object_xcoff_read *ocr = |
| (struct simple_object_xcoff_read *) sobj->data; |
| struct simple_object_xcoff_attributes *ret; |
| |
| ret = XNEW (struct simple_object_xcoff_attributes); |
| ret->magic = ocr->magic; |
| ret->flags = ocr->flags; |
| return ret; |
| } |
| |
| /* Release the private data for an simple_object_read. */ |
| |
| static void |
| simple_object_xcoff_release_read (void *data) |
| { |
| XDELETE (data); |
| } |
| |
| /* Compare two attributes structures. */ |
| |
| static const char * |
| simple_object_xcoff_attributes_merge (void *todata, void *fromdata, int *err) |
| { |
| struct simple_object_xcoff_attributes *to = |
| (struct simple_object_xcoff_attributes *) todata; |
| struct simple_object_xcoff_attributes *from = |
| (struct simple_object_xcoff_attributes *) fromdata; |
| |
| if (to->magic != from->magic) |
| { |
| *err = 0; |
| return "XCOFF object format mismatch"; |
| } |
| return NULL; |
| } |
| |
| /* Release the private data for an attributes structure. */ |
| |
| static void |
| simple_object_xcoff_release_attributes (void *data) |
| { |
| XDELETE (data); |
| } |
| |
| /* Prepare to write out a file. */ |
| |
| static void * |
| simple_object_xcoff_start_write (void *attributes_data, |
| const char **errmsg ATTRIBUTE_UNUSED, |
| int *err ATTRIBUTE_UNUSED) |
| { |
| struct simple_object_xcoff_attributes *attrs = |
| (struct simple_object_xcoff_attributes *) attributes_data; |
| struct simple_object_xcoff_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_xcoff_attributes); |
| *ret = *attrs; |
| return ret; |
| } |
| |
| /* Write out a XCOFF filehdr. */ |
| |
| static int |
| simple_object_xcoff_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_xcoff_attributes *attrs = |
| (struct simple_object_xcoff_attributes *) sobj->data; |
| int u64 = attrs->magic == U64_TOCMAGIC; |
| unsigned char hdrbuf[sizeof (struct external_filehdr)]; |
| unsigned char *hdr; |
| void (*set_16) (unsigned char *, unsigned short); |
| void (*set_32) (unsigned char *, unsigned int); |
| void (*set_64) (unsigned char *, ulong_type); |
| |
| hdr = &hdrbuf[0]; |
| |
| set_16 = simple_object_set_big_16; |
| set_32 = simple_object_set_big_32; |
| set_64 = simple_object_set_big_64; |
| |
| 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. */ |
| if (u64) |
| { |
| set_64 (hdr + offsetof (struct external_filehdr, u.xcoff64.f_symptr), |
| symtab_offset); |
| set_32 (hdr + offsetof (struct external_filehdr, u.xcoff64.f_nsyms), |
| nsyms); |
| /* f_opthdr left as zero. */ |
| set_16 (hdr + offsetof (struct external_filehdr, u.xcoff64.f_flags), |
| attrs->flags); |
| } |
| else |
| { |
| set_32 (hdr + offsetof (struct external_filehdr, u.xcoff64.f_symptr), |
| symtab_offset); |
| set_32 (hdr + offsetof (struct external_filehdr, u.xcoff64.f_nsyms), |
| nsyms); |
| /* f_opthdr left as zero. */ |
| set_16 (hdr + offsetof (struct external_filehdr, u.xcoff64.f_flags), |
| attrs->flags); |
| } |
| |
| return simple_object_internal_write (descriptor, 0, hdrbuf, |
| sizeof (struct external_filehdr), |
| errmsg, err); |
| } |
| |
| /* Write out a XCOFF section header. */ |
| |
| static int |
| simple_object_xcoff_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_xcoff_read *ocr = |
| (struct simple_object_xcoff_read *) sobj->data; |
| int u64 = ocr->magic == U64_TOCMAGIC; |
| void (*set_32) (unsigned char *, unsigned int); |
| void (*set_64) (unsigned char *, unsigned int); |
| unsigned char hdrbuf[sizeof (struct external_scnhdr)]; |
| unsigned char *hdr; |
| size_t namelen; |
| unsigned int flags; |
| |
| set_32 = simple_object_set_big_32; |
| set_64 = simple_object_set_big_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. */ |
| if (u64) |
| { |
| set_64 (hdr + offsetof (struct external_scnhdr, u.xcoff64.s_size), |
| scnsize); |
| set_64 (hdr + offsetof (struct external_scnhdr, u.xcoff64.s_scnptr), |
| offset); |
| } |
| else |
| { |
| set_32 (hdr + offsetof (struct external_scnhdr, u.xcoff32.s_size), |
| scnsize); |
| set_32 (hdr + offsetof (struct external_scnhdr, u.xcoff32.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; |
| if (align > 13) |
| align = 13; |
| if (u64) |
| set_32 (hdr + offsetof (struct external_scnhdr, u.xcoff64.s_flags), flags); |
| else |
| set_32 (hdr + offsetof (struct external_scnhdr, u.xcoff32.s_flags), flags); |
| |
| return simple_object_internal_write (descriptor, scnhdr_offset, hdrbuf, |
| u64 ? SCNHSZ64 : SCNHSZ32, |
| errmsg, err); |
| } |
| |
| /* Write out a complete XCOFF file. */ |
| |
| static const char * |
| simple_object_xcoff_write_to_file (simple_object_write *sobj, int descriptor, |
| int *err) |
| { |
| struct simple_object_xcoff_read *ocr = |
| (struct simple_object_xcoff_read *) sobj->data; |
| int u64 = ocr->magic == U64_TOCMAGIC; |
| 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 = simple_object_set_big_16; |
| set_32 = simple_object_set_big_32; |
| |
| nscns = 0; |
| for (section = sobj->sections; section != NULL; section = section->next) |
| ++nscns; |
| |
| scnhdr_offset = sizeof (struct external_filehdr) - (u64 ? 4 : 0); |
| offset = scnhdr_offset + nscns * (u64 ? SCNHSZ64 : SCNHSZ32); |
| 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_xcoff_write_scnhdr (sobj, descriptor, section->name, |
| &name_offset, scnhdr_offset, |
| scnsize, offset, section->align, |
| &errmsg, err)) |
| return errmsg; |
| |
| scnhdr_offset += u64 ? SCNHSZ64 : SCNHSZ32; |
| 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 * SYMESZ; |
| |
| /* Write out file symbol. */ |
| memset (&syms[0], 0, sizeof (syms)); |
| if (!u64) |
| strcpy ((char *)&syms[0].sym.u.xcoff32.n.n_name[0], ".file"); |
| set_16 (&syms[0].sym.n_scnum[0], N_DEBUG); |
| set_16 (&syms[0].sym.n_type[0], IMAGE_SYM_TYPE); |
| syms[0].sym.n_sclass[0] = C_FILE; |
| syms[0].sym.n_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 <= FILNMLEN) |
| memcpy (&syms[1].aux.x_file.x_fname[0], source_filename, sflen); |
| else |
| { |
| set_32 (&syms[1].aux.x_file._x.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.n_type[0], IMAGE_SYM_TYPE); |
| syms[0].sym.n_sclass[0] = C_STAT; |
| syms[0].sym.n_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.n_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.u.xcoff32.n.n.n_zeroes[0], 0); |
| set_32 (&syms[0].sym.u.xcoff32.n.n.n_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.u.xcoff32.n.n_name[0], section->name, |
| strlen (section->name)); |
| memset (&syms[0].sym.u.xcoff32.n.n_name[strlen (section->name)], 0, |
| N_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_xcoff_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_xcoff_release_write (void *data) |
| { |
| XDELETE (data); |
| } |
| |
| /* The XCOFF functions. */ |
| |
| const struct simple_object_functions simple_object_xcoff_functions = |
| { |
| simple_object_xcoff_match, |
| simple_object_xcoff_find_sections, |
| simple_object_xcoff_fetch_attributes, |
| simple_object_xcoff_release_read, |
| simple_object_xcoff_attributes_merge, |
| simple_object_xcoff_release_attributes, |
| simple_object_xcoff_start_write, |
| simple_object_xcoff_write_to_file, |
| simple_object_xcoff_release_write, |
| NULL |
| }; |