1 /* simple-object-coff.c -- routines to manipulate XCOFF object files.
2 Copyright (C) 2013-2017 Free Software Foundation, Inc.
3 Written by Ian Lance Taylor, Google and David Edelsohn, IBM.
5 This program is free software; you can redistribute it and/or modify it
6 under the terms of the GNU General Public License as published by the
7 Free Software Foundation; either version 2, or (at your option) any
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, 51 Franklin Street - Fifth Floor,
18 Boston, MA 02110-1301, USA. */
21 #include "libiberty.h"
22 #include "simple-object.h"
39 #ifdef HAVE_INTTYPES_H
43 #include "simple-object-common.h"
45 /* XCOFF structures and constants. */
47 /* XCOFF file header. */
49 struct external_filehdr
51 unsigned char f_magic[2]; /* magic number */
52 unsigned char f_nscns[2]; /* number of sections */
53 unsigned char f_timdat[4]; /* time & date stamp */
58 unsigned char f_symptr[4]; /* file pointer to symtab */
59 unsigned char f_nsyms[4]; /* number of symtab entries */
60 unsigned char f_opthdr[2]; /* sizeof(optional hdr) */
61 unsigned char f_flags[2]; /* flags */
65 unsigned char f_symptr[8]; /* file pointer to symtab */
66 unsigned char f_opthdr[2]; /* sizeof(optional hdr) */
67 unsigned char f_flags[2]; /* flags */
68 unsigned char f_nsyms[4]; /* number of symtab entries */
73 /* Bits for filehdr f_flags field. */
75 #define F_EXEC (0x0002)
77 /* The known values of f_magic in an XCOFF file header. */
79 #define U802WRMAGIC 0730 /* Writeable text segments. */
80 #define U802ROMAGIC 0735 /* Readonly sharable text segments. */
81 #define U802TOCMAGIC 0737 /* Readonly text segments and TOC. */
82 #define U803XTOCMAGIC 0757 /* Aix 4.3 64-bit XCOFF. */
83 #define U64_TOCMAGIC 0767 /* AIX 5+ 64-bit XCOFF. */
85 /* XCOFF section header. */
87 struct external_scnhdr
89 unsigned char s_name[8]; /* section name */
94 unsigned char s_paddr[4]; /* physical address, aliased s_nlib */
95 unsigned char s_vaddr[4]; /* virtual address */
96 unsigned char s_size[4]; /* section size */
97 unsigned char s_scnptr[4]; /* file ptr to raw data for section */
98 unsigned char s_relptr[4]; /* file ptr to relocation */
99 unsigned char s_lnnoptr[4]; /* file ptr to line numbers */
100 unsigned char s_nreloc[2]; /* number of relocation entries */
101 unsigned char s_nlnno[2]; /* number of line number entries */
102 unsigned char s_flags[4]; /* flags */
106 unsigned char s_paddr[8]; /* physical address, aliased s_nlib */
107 unsigned char s_vaddr[8]; /* virtual address */
108 unsigned char s_size[8]; /* section size */
109 unsigned char s_scnptr[8]; /* file ptr to raw data for section */
110 unsigned char s_relptr[8]; /* file ptr to relocation */
111 unsigned char s_lnnoptr[8]; /* file ptr to line numbers */
112 unsigned char s_nreloc[4]; /* number of relocation entries */
113 unsigned char s_nlnno[4]; /* number of line number entries */
114 unsigned char s_flags[4]; /* flags */
119 #define SCNHSZ32 (40)
120 #define SCNHSZ64 (68)
122 /* The length of the s_name field in struct external_scnhdr. */
126 /* Bits for scnhdr s_flags field. */
128 #define STYP_DATA 0x40
130 /* XCOFF symbol table entry. */
133 #define N_SYMNMLEN (8) /* # characters in a symbol name */
135 /* The format of an XCOFF symbol-table entry. */
136 struct external_syment
141 /* The name of the symbol. There is an implicit null character
142 after the end of the array. */
143 char n_name[N_SYMNMLEN];
145 /* If n_zeroes is zero, n_offset is the offset the name from
146 the start of the string table. */
147 unsigned char n_zeroes[4];
148 unsigned char n_offset[4];
152 /* The symbol's value. */
153 unsigned char n_value[4];
156 /* The symbol's value. */
157 unsigned char n_value[8];
159 /* The offset of the symbol from the start of the string table. */
160 unsigned char n_offset[4];
164 /* The number of the section to which this symbol belongs. */
165 unsigned char n_scnum[2];
167 /* The type of symbol. (It can be interpreted as an n_lang
168 and an n_cpu byte, but we don't care about that here.) */
169 unsigned char n_type[2];
171 /* The class of symbol (a C_* value). */
172 unsigned char n_sclass[1];
174 /* The number of auxiliary symbols attached to this entry. */
175 unsigned char n_numaux[1];
180 /* Length allowed for filename in aux sym format 4. */
182 #define FILNMLEN (14)
184 /* Omits x_sym and other unused variants. */
186 union external_auxent
188 /* Aux sym format 4: file. */
191 char x_fname[FILNMLEN];
194 unsigned char x_zeroes[4];
195 unsigned char x_offset[4];
196 unsigned char x_pad[FILNMLEN-8];
197 unsigned char x_ftype;
200 /* Aux sym format 5: section. */
203 unsigned char x_scnlen[4]; /* section length */
204 unsigned char x_nreloc[2]; /* # relocation entries */
205 unsigned char x_nlinno[2]; /* # line numbers */
207 /* CSECT auxiliary entry. */
214 unsigned char x_scnlen[4]; /* csect length */
215 unsigned char x_parmhash[4]; /* parm type hash index */
216 unsigned char x_snhash[2]; /* sect num with parm hash */
217 unsigned char x_smtyp; /* symbol align and type */
218 unsigned char x_smclas; /* storage mapping class */
219 unsigned char x_stab; /* dbx stab info index */
220 unsigned char x_snstab[2]; /* sect num with dbx stab */
227 unsigned char x_scnlen_lo[4]; /* csect length */
228 unsigned char x_parmhash[4]; /* parm type hash index */
229 unsigned char x_snhash[2]; /* sect num with parm hash */
230 unsigned char x_smtyp; /* symbol align and type */
231 unsigned char x_smclas; /* storage mapping class */
232 unsigned char x_scnlen_hi[4];
234 unsigned char x_auxtype;
238 /* SECTION/DWARF auxiliary entry. */
241 unsigned char x_scnlen[4]; /* section length */
242 unsigned char pad1[4];
243 unsigned char x_nreloc[4]; /* number RLDs */
247 /* Symbol-related constants. */
250 #define IMAGE_SYM_TYPE_NULL (0)
251 #define IMAGE_SYM_DTYPE_NULL (0)
252 #define IMAGE_SYM_CLASS_STATIC (3)
253 #define IMAGE_SYM_CLASS_FILE (103)
255 #define IMAGE_SYM_TYPE \
256 ((IMAGE_SYM_DTYPE_NULL << 4) | IMAGE_SYM_TYPE_NULL)
261 #define C_HIDEXT (107)
263 #define XTY_SD (1) /* section definition */
265 #define XMC_XO (7) /* extended operation */
267 /* Private data for an simple_object_read. */
269 struct simple_object_xcoff_read
272 unsigned short magic;
273 /* Number of sections. */
274 unsigned short nscns;
275 /* File offset of symbol table. */
277 /* Number of symbol table entries. */
280 unsigned short flags;
281 /* Offset of section headers in file. */
285 /* Private data for an simple_object_attributes. */
287 struct simple_object_xcoff_attributes
290 unsigned short magic;
292 unsigned short flags;
295 /* See if we have a XCOFF file. */
298 simple_object_xcoff_match (unsigned char header[SIMPLE_OBJECT_MATCH_HEADER_LEN],
299 int descriptor, off_t offset,
300 const char *segment_name ATTRIBUTE_UNUSED,
301 const char **errmsg, int *err)
303 unsigned short magic;
304 unsigned short (*fetch_16) (const unsigned char *);
305 unsigned int (*fetch_32) (const unsigned char *);
306 ulong_type (*fetch_64) (const unsigned char *);
307 unsigned char hdrbuf[sizeof (struct external_filehdr)];
308 struct simple_object_xcoff_read *ocr;
311 magic = simple_object_fetch_big_16 (header);
313 if (magic != U802TOCMAGIC && magic != U64_TOCMAGIC)
320 fetch_16 = simple_object_fetch_big_16;
321 fetch_32 = simple_object_fetch_big_32;
322 fetch_64 = simple_object_fetch_big_64;
324 if (!simple_object_internal_read (descriptor, offset, hdrbuf, sizeof hdrbuf,
328 u64 = magic == U64_TOCMAGIC;
330 ocr = XNEW (struct simple_object_xcoff_read);
332 ocr->nscns = fetch_16 (hdrbuf + offsetof (struct external_filehdr, f_nscns));
335 ocr->symptr = fetch_64 (hdrbuf
336 + offsetof (struct external_filehdr,
337 u.xcoff64.f_symptr));
338 ocr->nsyms = fetch_32 (hdrbuf + offsetof (struct external_filehdr,
340 ocr->scnhdr_offset = (sizeof (struct external_filehdr)
341 + fetch_16 (hdrbuf + offsetof (struct external_filehdr,
342 u.xcoff64.f_opthdr)));
347 ocr->symptr = fetch_32 (hdrbuf
348 + offsetof (struct external_filehdr,
349 u.xcoff32.f_symptr));
350 ocr->nsyms = fetch_32 (hdrbuf + offsetof (struct external_filehdr,
352 ocr->scnhdr_offset = (sizeof (struct external_filehdr) - 4
353 + fetch_16 (hdrbuf + offsetof (struct external_filehdr,
354 u.xcoff32.f_opthdr)));
361 /* Read the string table in a XCOFF file. */
364 simple_object_xcoff_read_strtab (simple_object_read *sobj, size_t *strtab_size,
365 const char **errmsg, int *err)
367 struct simple_object_xcoff_read *ocr =
368 (struct simple_object_xcoff_read *) sobj->data;
370 unsigned char strsizebuf[4];
374 strtab_offset = sobj->offset + ocr->symptr
375 + ocr->nsyms * SYMESZ;
376 if (!simple_object_internal_read (sobj->descriptor, strtab_offset,
377 strsizebuf, 4, errmsg, err))
379 strsize = simple_object_fetch_big_32 (strsizebuf);
380 strtab = XNEWVEC (char, strsize);
381 if (!simple_object_internal_read (sobj->descriptor, strtab_offset,
382 (unsigned char *) strtab, strsize, errmsg,
388 *strtab_size = strsize;
392 /* Find all sections in a XCOFF file. */
395 simple_object_xcoff_find_sections (simple_object_read *sobj,
396 int (*pfn) (void *, const char *,
397 off_t offset, off_t length),
401 struct simple_object_xcoff_read *ocr =
402 (struct simple_object_xcoff_read *) sobj->data;
403 int u64 = ocr->magic == U64_TOCMAGIC;
405 unsigned char *scnbuf;
407 unsigned short (*fetch_16) (const unsigned char *);
408 unsigned int (*fetch_32) (const unsigned char *);
409 ulong_type (*fetch_64) (const unsigned char *);
413 struct external_syment *symtab = NULL;
416 scnhdr_size = u64 ? SCNHSZ64 : SCNHSZ32;
417 scnbuf = XNEWVEC (unsigned char, scnhdr_size * ocr->nscns);
418 if (!simple_object_internal_read (sobj->descriptor,
419 sobj->offset + ocr->scnhdr_offset,
420 scnbuf, scnhdr_size * ocr->nscns, &errmsg,
427 fetch_16 = simple_object_fetch_big_16;
428 fetch_32 = simple_object_fetch_big_32;
429 fetch_64 = simple_object_fetch_big_64;
434 for (i = 0; i < nscns; ++i)
436 unsigned char *scnhdr;
437 unsigned char *scnname;
438 char namebuf[SCNNMLEN + 1];
443 scnhdr = scnbuf + i * scnhdr_size;
444 scnname = scnhdr + offsetof (struct external_scnhdr, s_name);
445 memcpy (namebuf, scnname, SCNNMLEN);
446 namebuf[SCNNMLEN] = '\0';
448 if (namebuf[0] == '/')
453 strindex = strtol (namebuf + 1, &end, 10);
456 /* The real section name is found in the string
460 strtab = simple_object_xcoff_read_strtab (sobj,
470 if (strindex < 4 || strindex >= strtab_size)
475 return "section string index out of range";
478 name = strtab + strindex;
484 scnptr = fetch_64 (scnhdr + offsetof (struct external_scnhdr,
485 u.xcoff64.s_scnptr));
486 size = fetch_64 (scnhdr + offsetof (struct external_scnhdr,
491 scnptr = fetch_32 (scnhdr + offsetof (struct external_scnhdr,
492 u.xcoff32.s_scnptr));
493 size = fetch_32 (scnhdr + offsetof (struct external_scnhdr,
497 if (!(*pfn) (data, name, scnptr, size))
501 /* Special handling for .go_export csect. */
507 unsigned int n_numaux, n_offset, n_zeroes;
510 /* Read symbol table. */
511 symtab = XNEWVEC (struct external_syment, ocr->nsyms * SYMESZ);
512 if (!simple_object_internal_read (sobj->descriptor,
513 sobj->offset + ocr->symptr,
514 (unsigned char *) symtab,
523 /* Search in symbol table if we have a ".go_export" symbol. */
524 for (i = 0; i < ocr->nsyms; i += n_numaux + 1)
526 sym = (unsigned char *) &symtab[i];
527 n_numaux = symtab[i].n_numaux[0];
529 if (symtab[i].n_sclass[0] != C_EXT
530 && symtab[i].n_sclass[0] != C_HIDEXT)
533 /* Must have at least one csect auxiliary entry. */
534 if (n_numaux < 1 || i + n_numaux >= ocr->nsyms)
537 n_scnum = fetch_16 (sym + offsetof (struct external_syment,
539 if (n_scnum < 1 || (unsigned int) n_scnum > nscns)
544 n_value = fetch_64 (sym + offsetof (struct external_syment,
546 n_offset = fetch_32 (sym + offsetof (struct external_syment,
547 u.xcoff64.n_offset));
551 /* ".go_export" is longer than N_SYMNMLEN. */
552 n_zeroes = fetch_32 (sym + offsetof (struct external_syment,
553 u.xcoff32.n.n.n_zeroes));
557 n_value = fetch_32 (sym + offsetof (struct external_syment,
559 n_offset = fetch_32 (sym + offsetof (struct external_syment,
560 u.xcoff32.n.n.n_offset));
563 /* The real symbol name is found in the string table. */
566 strtab = simple_object_xcoff_read_strtab (sobj,
577 if (n_offset >= strtab_size)
583 return "symbol string index out of range";
585 n_name = strtab + n_offset;
587 if (!strcmp (n_name, ".go_export"))
589 union external_auxent *auxent;
590 unsigned char *aux, *scnhdr;
591 off_t scnptr, x_scnlen;
593 /* Found .go_export symbol, read its csect auxiliary entry.
594 By convention, it is the last auxiliary entry. */
595 auxent = (union external_auxent *) &symtab[i + n_numaux];
596 aux = (unsigned char *) auxent;
599 if ((auxent->u.xcoff64.x_csect.x_smtyp & 0x7) != XTY_SD
600 || auxent->u.xcoff64.x_csect.x_smclas != XMC_XO)
603 x_scnlen = fetch_32 (aux + offsetof (union external_auxent,
604 u.xcoff64.x_csect.x_scnlen_hi));
605 x_scnlen = x_scnlen << 32
606 | fetch_32 (aux + offsetof (union external_auxent,
607 u.xcoff64.x_csect.x_scnlen_lo));
611 if ((auxent->u.xcoff32.x_csect.x_smtyp & 0x7) != XTY_SD
612 || auxent->u.xcoff32.x_csect.x_smclas != XMC_XO)
615 x_scnlen = fetch_32 (aux + offsetof (union external_auxent,
616 u.xcoff32.x_csect.x_scnlen));
619 /* Get header of containing section. */
620 scnhdr = scnbuf + (n_scnum - 1) * scnhdr_size;
623 scnptr = fetch_64 (scnhdr + offsetof (struct external_scnhdr,
624 u.xcoff64.s_scnptr));
625 size = fetch_64 (scnhdr + offsetof (struct external_scnhdr,
630 scnptr = fetch_32 (scnhdr + offsetof (struct external_scnhdr,
631 u.xcoff32.s_scnptr));
632 size = fetch_32 (scnhdr + offsetof (struct external_scnhdr,
635 if (n_value + x_scnlen > size)
638 (*pfn) (data, ".go_export", scnptr + n_value, x_scnlen);
653 /* Fetch the attributes for an simple_object_read. */
656 simple_object_xcoff_fetch_attributes (simple_object_read *sobj,
657 const char **errmsg ATTRIBUTE_UNUSED,
658 int *err ATTRIBUTE_UNUSED)
660 struct simple_object_xcoff_read *ocr =
661 (struct simple_object_xcoff_read *) sobj->data;
662 struct simple_object_xcoff_attributes *ret;
664 ret = XNEW (struct simple_object_xcoff_attributes);
665 ret->magic = ocr->magic;
666 ret->flags = ocr->flags;
670 /* Release the private data for an simple_object_read. */
673 simple_object_xcoff_release_read (void *data)
678 /* Compare two attributes structures. */
681 simple_object_xcoff_attributes_merge (void *todata, void *fromdata, int *err)
683 struct simple_object_xcoff_attributes *to =
684 (struct simple_object_xcoff_attributes *) todata;
685 struct simple_object_xcoff_attributes *from =
686 (struct simple_object_xcoff_attributes *) fromdata;
688 if (to->magic != from->magic)
691 return "XCOFF object format mismatch";
696 /* Release the private data for an attributes structure. */
699 simple_object_xcoff_release_attributes (void *data)
704 /* Prepare to write out a file. */
707 simple_object_xcoff_start_write (void *attributes_data,
708 const char **errmsg ATTRIBUTE_UNUSED,
709 int *err ATTRIBUTE_UNUSED)
711 struct simple_object_xcoff_attributes *attrs =
712 (struct simple_object_xcoff_attributes *) attributes_data;
713 struct simple_object_xcoff_attributes *ret;
715 /* We're just going to record the attributes, but we need to make a
716 copy because the user may delete them. */
717 ret = XNEW (struct simple_object_xcoff_attributes);
722 /* Write out a XCOFF filehdr. */
725 simple_object_xcoff_write_filehdr (simple_object_write *sobj, int descriptor,
726 unsigned int nscns, size_t symtab_offset,
727 unsigned int nsyms, const char **errmsg,
730 struct simple_object_xcoff_attributes *attrs =
731 (struct simple_object_xcoff_attributes *) sobj->data;
732 int u64 = attrs->magic == U64_TOCMAGIC;
733 unsigned char hdrbuf[sizeof (struct external_filehdr)];
735 void (*set_16) (unsigned char *, unsigned short);
736 void (*set_32) (unsigned char *, unsigned int);
737 void (*set_64) (unsigned char *, ulong_type);
741 set_16 = simple_object_set_big_16;
742 set_32 = simple_object_set_big_32;
743 set_64 = simple_object_set_big_64;
745 memset (hdr, 0, sizeof (struct external_filehdr));
747 set_16 (hdr + offsetof (struct external_filehdr, f_magic), attrs->magic);
748 set_16 (hdr + offsetof (struct external_filehdr, f_nscns), nscns);
749 /* f_timdat left as zero. */
752 set_64 (hdr + offsetof (struct external_filehdr, u.xcoff64.f_symptr),
754 set_32 (hdr + offsetof (struct external_filehdr, u.xcoff64.f_nsyms),
756 /* f_opthdr left as zero. */
757 set_16 (hdr + offsetof (struct external_filehdr, u.xcoff64.f_flags),
762 set_32 (hdr + offsetof (struct external_filehdr, u.xcoff64.f_symptr),
764 set_32 (hdr + offsetof (struct external_filehdr, u.xcoff64.f_nsyms),
766 /* f_opthdr left as zero. */
767 set_16 (hdr + offsetof (struct external_filehdr, u.xcoff64.f_flags),
771 return simple_object_internal_write (descriptor, 0, hdrbuf,
772 sizeof (struct external_filehdr),
776 /* Write out a XCOFF section header. */
779 simple_object_xcoff_write_scnhdr (simple_object_write *sobj,
781 const char *name, size_t *name_offset,
782 off_t scnhdr_offset, size_t scnsize,
783 off_t offset, unsigned int align,
784 const char **errmsg, int *err)
786 struct simple_object_xcoff_read *ocr =
787 (struct simple_object_xcoff_read *) sobj->data;
788 int u64 = ocr->magic == U64_TOCMAGIC;
789 void (*set_32) (unsigned char *, unsigned int);
790 void (*set_64) (unsigned char *, unsigned int);
791 unsigned char hdrbuf[sizeof (struct external_scnhdr)];
796 set_32 = simple_object_set_big_32;
797 set_64 = simple_object_set_big_32;
799 memset (hdrbuf, 0, sizeof hdrbuf);
802 namelen = strlen (name);
803 if (namelen <= SCNNMLEN)
804 strncpy ((char *) hdr + offsetof (struct external_scnhdr, s_name),
808 snprintf ((char *) hdr + offsetof (struct external_scnhdr, s_name),
809 SCNNMLEN, "/%lu", (unsigned long) *name_offset);
810 *name_offset += namelen + 1;
813 /* s_paddr left as zero. */
814 /* s_vaddr left as zero. */
817 set_64 (hdr + offsetof (struct external_scnhdr, u.xcoff64.s_size),
819 set_64 (hdr + offsetof (struct external_scnhdr, u.xcoff64.s_scnptr),
824 set_32 (hdr + offsetof (struct external_scnhdr, u.xcoff32.s_size),
826 set_32 (hdr + offsetof (struct external_scnhdr, u.xcoff32.s_scnptr),
829 /* s_relptr left as zero. */
830 /* s_lnnoptr left as zero. */
831 /* s_nreloc left as zero. */
832 /* s_nlnno left as zero. */
837 set_32 (hdr + offsetof (struct external_scnhdr, u.xcoff64.s_flags), flags);
839 set_32 (hdr + offsetof (struct external_scnhdr, u.xcoff32.s_flags), flags);
841 return simple_object_internal_write (descriptor, scnhdr_offset, hdrbuf,
842 u64 ? SCNHSZ64 : SCNHSZ32,
846 /* Write out a complete XCOFF file. */
849 simple_object_xcoff_write_to_file (simple_object_write *sobj, int descriptor,
852 struct simple_object_xcoff_read *ocr =
853 (struct simple_object_xcoff_read *) sobj->data;
854 int u64 = ocr->magic == U64_TOCMAGIC;
855 unsigned int nscns, secnum;
856 simple_object_write_section *section;
858 size_t symtab_offset;
864 unsigned char strsizebuf[4];
865 /* The interface doesn't give us access to the name of the input file
866 yet. We want to use its basename for the FILE symbol. This is
867 what 'gas' uses when told to assemble from stdin. */
868 const char *source_filename = "fake";
872 struct external_syment sym;
873 union external_auxent aux;
875 void (*set_16) (unsigned char *, unsigned short);
876 void (*set_32) (unsigned char *, unsigned int);
878 set_16 = simple_object_set_big_16;
879 set_32 = simple_object_set_big_32;
882 for (section = sobj->sections; section != NULL; section = section->next)
885 scnhdr_offset = sizeof (struct external_filehdr) - (u64 ? 4 : 0);
886 offset = scnhdr_offset + nscns * (u64 ? SCNHSZ64 : SCNHSZ32);
888 for (section = sobj->sections; section != NULL; section = section->next)
893 struct simple_object_write_section_buffer *buffer;
895 mask = (1U << section->align) - 1;
896 new_offset = offset & mask;
897 new_offset &= ~ mask;
898 while (new_offset > offset)
900 unsigned char zeroes[16];
903 memset (zeroes, 0, sizeof zeroes);
904 write = new_offset - offset;
905 if (write > sizeof zeroes)
906 write = sizeof zeroes;
907 if (!simple_object_internal_write (descriptor, offset, zeroes, write,
913 for (buffer = section->buffers; buffer != NULL; buffer = buffer->next)
915 if (!simple_object_internal_write (descriptor, offset + scnsize,
916 ((const unsigned char *)
918 buffer->size, &errmsg, err))
920 scnsize += buffer->size;
923 if (!simple_object_xcoff_write_scnhdr (sobj, descriptor, section->name,
924 &name_offset, scnhdr_offset,
925 scnsize, offset, section->align,
929 scnhdr_offset += u64 ? SCNHSZ64 : SCNHSZ32;
933 /* Symbol table is always half-word aligned. */
934 offset += (offset & 1);
935 /* There is a file symbol and a section symbol per section,
936 and each of these has a single auxiliary symbol following. */
937 nsyms = 2 * (nscns + 1);
938 symtab_offset = offset;
939 /* Advance across space reserved for symbol table to locate
940 start of string table. */
941 offset += nsyms * SYMESZ;
943 /* Write out file symbol. */
944 memset (&syms[0], 0, sizeof (syms));
946 strcpy ((char *)&syms[0].sym.u.xcoff32.n.n_name[0], ".file");
947 set_16 (&syms[0].sym.n_scnum[0], N_DEBUG);
948 set_16 (&syms[0].sym.n_type[0], IMAGE_SYM_TYPE);
949 syms[0].sym.n_sclass[0] = C_FILE;
950 syms[0].sym.n_numaux[0] = 1;
951 /* The name need not be nul-terminated if it fits into the x_fname field
952 directly, but must be if it has to be placed into the string table. */
953 sflen = strlen (source_filename);
954 if (sflen <= FILNMLEN)
955 memcpy (&syms[1].aux.x_file.x_fname[0], source_filename, sflen);
958 set_32 (&syms[1].aux.x_file._x.x_offset[0], name_offset);
959 if (!simple_object_internal_write (descriptor, offset + name_offset,
960 ((const unsigned char *)
962 sflen + 1, &errmsg, err))
964 name_offset += strlen (source_filename) + 1;
966 if (!simple_object_internal_write (descriptor, symtab_offset,
967 (const unsigned char *) &syms[0],
968 sizeof (syms), &errmsg, err))
971 /* Write the string table length, followed by the strings and section
972 symbols in step with each other. */
973 set_32 (strsizebuf, name_offset);
974 if (!simple_object_internal_write (descriptor, offset, strsizebuf, 4,
979 secsym_offset = symtab_offset + sizeof (syms);
980 memset (&syms[0], 0, sizeof (syms));
981 set_16 (&syms[0].sym.n_type[0], IMAGE_SYM_TYPE);
982 syms[0].sym.n_sclass[0] = C_STAT;
983 syms[0].sym.n_numaux[0] = 1;
986 for (section = sobj->sections; section != NULL; section = section->next)
990 struct simple_object_write_section_buffer *buffer;
992 namelen = strlen (section->name);
993 set_16 (&syms[0].sym.n_scnum[0], secnum++);
995 for (buffer = section->buffers; buffer != NULL; buffer = buffer->next)
996 scnsize += buffer->size;
997 set_32 (&syms[1].aux.x_scn.x_scnlen[0], scnsize);
998 if (namelen > SCNNMLEN)
1000 set_32 (&syms[0].sym.u.xcoff32.n.n.n_zeroes[0], 0);
1001 set_32 (&syms[0].sym.u.xcoff32.n.n.n_offset[0], name_offset);
1002 if (!simple_object_internal_write (descriptor, offset + name_offset,
1003 ((const unsigned char *)
1005 namelen + 1, &errmsg, err))
1007 name_offset += namelen + 1;
1011 memcpy (&syms[0].sym.u.xcoff32.n.n_name[0], section->name,
1012 strlen (section->name));
1013 memset (&syms[0].sym.u.xcoff32.n.n_name[strlen (section->name)], 0,
1014 N_SYMNMLEN - strlen (section->name));
1017 if (!simple_object_internal_write (descriptor, secsym_offset,
1018 (const unsigned char *) &syms[0],
1019 sizeof (syms), &errmsg, err))
1021 secsym_offset += sizeof (syms);
1024 if (!simple_object_xcoff_write_filehdr (sobj, descriptor, nscns,
1025 symtab_offset, nsyms, &errmsg, err))
1031 /* Release the private data for an simple_object_write structure. */
1034 simple_object_xcoff_release_write (void *data)
1039 /* The XCOFF functions. */
1041 const struct simple_object_functions simple_object_xcoff_functions =
1043 simple_object_xcoff_match,
1044 simple_object_xcoff_find_sections,
1045 simple_object_xcoff_fetch_attributes,
1046 simple_object_xcoff_release_read,
1047 simple_object_xcoff_attributes_merge,
1048 simple_object_xcoff_release_attributes,
1049 simple_object_xcoff_start_write,
1050 simple_object_xcoff_write_to_file,
1051 simple_object_xcoff_release_write,