1*38fd1498Szrj /* simple-object-coff.c -- routines to manipulate COFF object files.
2*38fd1498Szrj Copyright (C) 2010-2018 Free Software Foundation, Inc.
3*38fd1498Szrj Written by Ian Lance Taylor, Google.
4*38fd1498Szrj
5*38fd1498Szrj This program is free software; you can redistribute it and/or modify it
6*38fd1498Szrj under the terms of the GNU General Public License as published by the
7*38fd1498Szrj Free Software Foundation; either version 2, or (at your option) any
8*38fd1498Szrj later version.
9*38fd1498Szrj
10*38fd1498Szrj This program is distributed in the hope that it will be useful,
11*38fd1498Szrj but WITHOUT ANY WARRANTY; without even the implied warranty of
12*38fd1498Szrj MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13*38fd1498Szrj GNU General Public License for more details.
14*38fd1498Szrj
15*38fd1498Szrj You should have received a copy of the GNU General Public License
16*38fd1498Szrj along with this program; if not, write to the Free Software
17*38fd1498Szrj Foundation, 51 Franklin Street - Fifth Floor,
18*38fd1498Szrj Boston, MA 02110-1301, USA. */
19*38fd1498Szrj
20*38fd1498Szrj #include "config.h"
21*38fd1498Szrj #include "libiberty.h"
22*38fd1498Szrj #include "simple-object.h"
23*38fd1498Szrj
24*38fd1498Szrj #include <errno.h>
25*38fd1498Szrj #include <stddef.h>
26*38fd1498Szrj
27*38fd1498Szrj #ifdef HAVE_STDLIB_H
28*38fd1498Szrj #include <stdlib.h>
29*38fd1498Szrj #endif
30*38fd1498Szrj
31*38fd1498Szrj #ifdef HAVE_STDINT_H
32*38fd1498Szrj #include <stdint.h>
33*38fd1498Szrj #endif
34*38fd1498Szrj
35*38fd1498Szrj #ifdef HAVE_STRING_H
36*38fd1498Szrj #include <string.h>
37*38fd1498Szrj #endif
38*38fd1498Szrj
39*38fd1498Szrj #ifdef HAVE_INTTYPES_H
40*38fd1498Szrj #include <inttypes.h>
41*38fd1498Szrj #endif
42*38fd1498Szrj
43*38fd1498Szrj #include "simple-object-common.h"
44*38fd1498Szrj
45*38fd1498Szrj /* COFF structures and constants. */
46*38fd1498Szrj
47*38fd1498Szrj /* COFF file header. */
48*38fd1498Szrj
49*38fd1498Szrj struct external_filehdr
50*38fd1498Szrj {
51*38fd1498Szrj unsigned char f_magic[2]; /* magic number */
52*38fd1498Szrj unsigned char f_nscns[2]; /* number of sections */
53*38fd1498Szrj unsigned char f_timdat[4]; /* time & date stamp */
54*38fd1498Szrj unsigned char f_symptr[4]; /* file pointer to symtab */
55*38fd1498Szrj unsigned char f_nsyms[4]; /* number of symtab entries */
56*38fd1498Szrj unsigned char f_opthdr[2]; /* sizeof(optional hdr) */
57*38fd1498Szrj unsigned char f_flags[2]; /* flags */
58*38fd1498Szrj };
59*38fd1498Szrj
60*38fd1498Szrj /* Bits for filehdr f_flags field. */
61*38fd1498Szrj
62*38fd1498Szrj #define F_EXEC (0x0002)
63*38fd1498Szrj #define IMAGE_FILE_SYSTEM (0x1000)
64*38fd1498Szrj #define IMAGE_FILE_DLL (0x2000)
65*38fd1498Szrj
66*38fd1498Szrj /* COFF section header. */
67*38fd1498Szrj
68*38fd1498Szrj struct external_scnhdr
69*38fd1498Szrj {
70*38fd1498Szrj unsigned char s_name[8]; /* section name */
71*38fd1498Szrj unsigned char s_paddr[4]; /* physical address, aliased s_nlib */
72*38fd1498Szrj unsigned char s_vaddr[4]; /* virtual address */
73*38fd1498Szrj unsigned char s_size[4]; /* section size */
74*38fd1498Szrj unsigned char s_scnptr[4]; /* file ptr to raw data for section */
75*38fd1498Szrj unsigned char s_relptr[4]; /* file ptr to relocation */
76*38fd1498Szrj unsigned char s_lnnoptr[4]; /* file ptr to line numbers */
77*38fd1498Szrj unsigned char s_nreloc[2]; /* number of relocation entries */
78*38fd1498Szrj unsigned char s_nlnno[2]; /* number of line number entries */
79*38fd1498Szrj unsigned char s_flags[4]; /* flags */
80*38fd1498Szrj };
81*38fd1498Szrj
82*38fd1498Szrj /* The length of the s_name field in struct external_scnhdr. */
83*38fd1498Szrj
84*38fd1498Szrj #define SCNNMLEN (8)
85*38fd1498Szrj
86*38fd1498Szrj /* Bits for scnhdr s_flags field. This includes some bits defined
87*38fd1498Szrj only for PE. This may need to be moved into coff_magic. */
88*38fd1498Szrj
89*38fd1498Szrj #define STYP_DATA (1 << 6)
90*38fd1498Szrj #define IMAGE_SCN_MEM_DISCARDABLE (1 << 25)
91*38fd1498Szrj #define IMAGE_SCN_MEM_SHARED (1 << 28)
92*38fd1498Szrj #define IMAGE_SCN_MEM_READ (1 << 30)
93*38fd1498Szrj
94*38fd1498Szrj #define IMAGE_SCN_ALIGN_POWER_BIT_POS 20
95*38fd1498Szrj #define IMAGE_SCN_ALIGN_POWER_CONST(val) \
96*38fd1498Szrj (((val) + 1) << IMAGE_SCN_ALIGN_POWER_BIT_POS)
97*38fd1498Szrj
98*38fd1498Szrj /* COFF symbol table entry. */
99*38fd1498Szrj
100*38fd1498Szrj #define E_SYMNMLEN 8 /* # characters in a symbol name */
101*38fd1498Szrj
102*38fd1498Szrj struct external_syment
103*38fd1498Szrj {
104*38fd1498Szrj union
105*38fd1498Szrj {
106*38fd1498Szrj unsigned char e_name[E_SYMNMLEN];
107*38fd1498Szrj
108*38fd1498Szrj struct
109*38fd1498Szrj {
110*38fd1498Szrj unsigned char e_zeroes[4];
111*38fd1498Szrj unsigned char e_offset[4];
112*38fd1498Szrj } e;
113*38fd1498Szrj } e;
114*38fd1498Szrj
115*38fd1498Szrj unsigned char e_value[4];
116*38fd1498Szrj unsigned char e_scnum[2];
117*38fd1498Szrj unsigned char e_type[2];
118*38fd1498Szrj unsigned char e_sclass[1];
119*38fd1498Szrj unsigned char e_numaux[1];
120*38fd1498Szrj };
121*38fd1498Szrj
122*38fd1498Szrj /* Length allowed for filename in aux sym format 4. */
123*38fd1498Szrj
124*38fd1498Szrj #define E_FILNMLEN 18
125*38fd1498Szrj
126*38fd1498Szrj /* Omits x_sym and other unused variants. */
127*38fd1498Szrj
128*38fd1498Szrj union external_auxent
129*38fd1498Szrj {
130*38fd1498Szrj /* Aux sym format 4: file. */
131*38fd1498Szrj union
132*38fd1498Szrj {
133*38fd1498Szrj char x_fname[E_FILNMLEN];
134*38fd1498Szrj struct
135*38fd1498Szrj {
136*38fd1498Szrj unsigned char x_zeroes[4];
137*38fd1498Szrj unsigned char x_offset[4];
138*38fd1498Szrj } x_n;
139*38fd1498Szrj } x_file;
140*38fd1498Szrj /* Aux sym format 5: section. */
141*38fd1498Szrj struct
142*38fd1498Szrj {
143*38fd1498Szrj unsigned char x_scnlen[4]; /* section length */
144*38fd1498Szrj unsigned char x_nreloc[2]; /* # relocation entries */
145*38fd1498Szrj unsigned char x_nlinno[2]; /* # line numbers */
146*38fd1498Szrj unsigned char x_checksum[4]; /* section COMDAT checksum */
147*38fd1498Szrj unsigned char x_associated[2]; /* COMDAT assoc section index */
148*38fd1498Szrj unsigned char x_comdat[1]; /* COMDAT selection number */
149*38fd1498Szrj } x_scn;
150*38fd1498Szrj };
151*38fd1498Szrj
152*38fd1498Szrj /* Symbol-related constants. */
153*38fd1498Szrj
154*38fd1498Szrj #define IMAGE_SYM_DEBUG (-2)
155*38fd1498Szrj #define IMAGE_SYM_TYPE_NULL (0)
156*38fd1498Szrj #define IMAGE_SYM_DTYPE_NULL (0)
157*38fd1498Szrj #define IMAGE_SYM_CLASS_STATIC (3)
158*38fd1498Szrj #define IMAGE_SYM_CLASS_FILE (103)
159*38fd1498Szrj
160*38fd1498Szrj #define IMAGE_SYM_TYPE \
161*38fd1498Szrj ((IMAGE_SYM_DTYPE_NULL << 4) | IMAGE_SYM_TYPE_NULL)
162*38fd1498Szrj
163*38fd1498Szrj /* Private data for an simple_object_read. */
164*38fd1498Szrj
165*38fd1498Szrj struct simple_object_coff_read
166*38fd1498Szrj {
167*38fd1498Szrj /* Magic number. */
168*38fd1498Szrj unsigned short magic;
169*38fd1498Szrj /* Whether the file is big-endian. */
170*38fd1498Szrj unsigned char is_big_endian;
171*38fd1498Szrj /* Number of sections. */
172*38fd1498Szrj unsigned short nscns;
173*38fd1498Szrj /* File offset of symbol table. */
174*38fd1498Szrj off_t symptr;
175*38fd1498Szrj /* Number of symbol table entries. */
176*38fd1498Szrj unsigned int nsyms;
177*38fd1498Szrj /* Flags. */
178*38fd1498Szrj unsigned short flags;
179*38fd1498Szrj /* Offset of section headers in file. */
180*38fd1498Szrj off_t scnhdr_offset;
181*38fd1498Szrj };
182*38fd1498Szrj
183*38fd1498Szrj /* Private data for an simple_object_attributes. */
184*38fd1498Szrj
185*38fd1498Szrj struct simple_object_coff_attributes
186*38fd1498Szrj {
187*38fd1498Szrj /* Magic number. */
188*38fd1498Szrj unsigned short magic;
189*38fd1498Szrj /* Whether the file is big-endian. */
190*38fd1498Szrj unsigned char is_big_endian;
191*38fd1498Szrj /* Flags. */
192*38fd1498Szrj unsigned short flags;
193*38fd1498Szrj };
194*38fd1498Szrj
195*38fd1498Szrj /* There is no magic number which indicates a COFF file as opposed to
196*38fd1498Szrj any other sort of file. Instead, each COFF file starts with a
197*38fd1498Szrj two-byte magic number which also indicates the type of the target.
198*38fd1498Szrj This struct holds a magic number as well as characteristics of that
199*38fd1498Szrj COFF format. */
200*38fd1498Szrj
201*38fd1498Szrj struct coff_magic_struct
202*38fd1498Szrj {
203*38fd1498Szrj /* Magic number. */
204*38fd1498Szrj unsigned short magic;
205*38fd1498Szrj /* Whether this magic number is for a big-endian file. */
206*38fd1498Szrj unsigned char is_big_endian;
207*38fd1498Szrj /* Flag bits, in the f_flags fields, which indicates that this file
208*38fd1498Szrj is not a relocatable object file. There is no flag which
209*38fd1498Szrj specifically indicates a relocatable object file, it is only
210*38fd1498Szrj implied by the absence of these flags. */
211*38fd1498Szrj unsigned short non_object_flags;
212*38fd1498Szrj };
213*38fd1498Szrj
214*38fd1498Szrj /* This is a list of the COFF magic numbers which we recognize, namely
215*38fd1498Szrj the ones used on Windows. More can be added as needed. */
216*38fd1498Szrj
217*38fd1498Szrj static const struct coff_magic_struct coff_magic[] =
218*38fd1498Szrj {
219*38fd1498Szrj /* i386. */
220*38fd1498Szrj { 0x14c, 0, F_EXEC | IMAGE_FILE_SYSTEM | IMAGE_FILE_DLL },
221*38fd1498Szrj /* x86_64. */
222*38fd1498Szrj { 0x8664, 0, F_EXEC | IMAGE_FILE_SYSTEM | IMAGE_FILE_DLL }
223*38fd1498Szrj };
224*38fd1498Szrj
225*38fd1498Szrj /* See if we have a COFF file. */
226*38fd1498Szrj
227*38fd1498Szrj 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)228*38fd1498Szrj simple_object_coff_match (unsigned char header[SIMPLE_OBJECT_MATCH_HEADER_LEN],
229*38fd1498Szrj int descriptor, off_t offset,
230*38fd1498Szrj const char *segment_name ATTRIBUTE_UNUSED,
231*38fd1498Szrj const char **errmsg, int *err)
232*38fd1498Szrj {
233*38fd1498Szrj size_t c;
234*38fd1498Szrj unsigned short magic_big;
235*38fd1498Szrj unsigned short magic_little;
236*38fd1498Szrj unsigned short magic;
237*38fd1498Szrj size_t i;
238*38fd1498Szrj int is_big_endian;
239*38fd1498Szrj unsigned short (*fetch_16) (const unsigned char *);
240*38fd1498Szrj unsigned int (*fetch_32) (const unsigned char *);
241*38fd1498Szrj unsigned char hdrbuf[sizeof (struct external_filehdr)];
242*38fd1498Szrj unsigned short flags;
243*38fd1498Szrj struct simple_object_coff_read *ocr;
244*38fd1498Szrj
245*38fd1498Szrj c = sizeof (coff_magic) / sizeof (coff_magic[0]);
246*38fd1498Szrj magic_big = simple_object_fetch_big_16 (header);
247*38fd1498Szrj magic_little = simple_object_fetch_little_16 (header);
248*38fd1498Szrj for (i = 0; i < c; ++i)
249*38fd1498Szrj {
250*38fd1498Szrj if (coff_magic[i].is_big_endian
251*38fd1498Szrj ? coff_magic[i].magic == magic_big
252*38fd1498Szrj : coff_magic[i].magic == magic_little)
253*38fd1498Szrj break;
254*38fd1498Szrj }
255*38fd1498Szrj if (i >= c)
256*38fd1498Szrj {
257*38fd1498Szrj *errmsg = NULL;
258*38fd1498Szrj *err = 0;
259*38fd1498Szrj return NULL;
260*38fd1498Szrj }
261*38fd1498Szrj is_big_endian = coff_magic[i].is_big_endian;
262*38fd1498Szrj
263*38fd1498Szrj magic = is_big_endian ? magic_big : magic_little;
264*38fd1498Szrj fetch_16 = (is_big_endian
265*38fd1498Szrj ? simple_object_fetch_big_16
266*38fd1498Szrj : simple_object_fetch_little_16);
267*38fd1498Szrj fetch_32 = (is_big_endian
268*38fd1498Szrj ? simple_object_fetch_big_32
269*38fd1498Szrj : simple_object_fetch_little_32);
270*38fd1498Szrj
271*38fd1498Szrj if (!simple_object_internal_read (descriptor, offset, hdrbuf, sizeof hdrbuf,
272*38fd1498Szrj errmsg, err))
273*38fd1498Szrj return NULL;
274*38fd1498Szrj
275*38fd1498Szrj flags = fetch_16 (hdrbuf + offsetof (struct external_filehdr, f_flags));
276*38fd1498Szrj if ((flags & coff_magic[i].non_object_flags) != 0)
277*38fd1498Szrj {
278*38fd1498Szrj *errmsg = "not relocatable object file";
279*38fd1498Szrj *err = 0;
280*38fd1498Szrj return NULL;
281*38fd1498Szrj }
282*38fd1498Szrj
283*38fd1498Szrj ocr = XNEW (struct simple_object_coff_read);
284*38fd1498Szrj ocr->magic = magic;
285*38fd1498Szrj ocr->is_big_endian = is_big_endian;
286*38fd1498Szrj ocr->nscns = fetch_16 (hdrbuf + offsetof (struct external_filehdr, f_nscns));
287*38fd1498Szrj ocr->symptr = fetch_32 (hdrbuf
288*38fd1498Szrj + offsetof (struct external_filehdr, f_symptr));
289*38fd1498Szrj ocr->nsyms = fetch_32 (hdrbuf + offsetof (struct external_filehdr, f_nsyms));
290*38fd1498Szrj ocr->flags = flags;
291*38fd1498Szrj ocr->scnhdr_offset = (sizeof (struct external_filehdr)
292*38fd1498Szrj + fetch_16 (hdrbuf + offsetof (struct external_filehdr,
293*38fd1498Szrj f_opthdr)));
294*38fd1498Szrj
295*38fd1498Szrj return (void *) ocr;
296*38fd1498Szrj }
297*38fd1498Szrj
298*38fd1498Szrj /* Read the string table in a COFF file. */
299*38fd1498Szrj
300*38fd1498Szrj static char *
simple_object_coff_read_strtab(simple_object_read * sobj,size_t * strtab_size,const char ** errmsg,int * err)301*38fd1498Szrj simple_object_coff_read_strtab (simple_object_read *sobj, size_t *strtab_size,
302*38fd1498Szrj const char **errmsg, int *err)
303*38fd1498Szrj {
304*38fd1498Szrj struct simple_object_coff_read *ocr =
305*38fd1498Szrj (struct simple_object_coff_read *) sobj->data;
306*38fd1498Szrj off_t strtab_offset;
307*38fd1498Szrj unsigned char strsizebuf[4];
308*38fd1498Szrj size_t strsize;
309*38fd1498Szrj char *strtab;
310*38fd1498Szrj
311*38fd1498Szrj strtab_offset = sobj->offset + ocr->symptr
312*38fd1498Szrj + ocr->nsyms * sizeof (struct external_syment);
313*38fd1498Szrj if (!simple_object_internal_read (sobj->descriptor, strtab_offset,
314*38fd1498Szrj strsizebuf, 4, errmsg, err))
315*38fd1498Szrj return NULL;
316*38fd1498Szrj strsize = (ocr->is_big_endian
317*38fd1498Szrj ? simple_object_fetch_big_32 (strsizebuf)
318*38fd1498Szrj : simple_object_fetch_little_32 (strsizebuf));
319*38fd1498Szrj strtab = XNEWVEC (char, strsize);
320*38fd1498Szrj if (!simple_object_internal_read (sobj->descriptor, strtab_offset,
321*38fd1498Szrj (unsigned char *) strtab, strsize, errmsg,
322*38fd1498Szrj err))
323*38fd1498Szrj {
324*38fd1498Szrj XDELETEVEC (strtab);
325*38fd1498Szrj return NULL;
326*38fd1498Szrj }
327*38fd1498Szrj *strtab_size = strsize;
328*38fd1498Szrj return strtab;
329*38fd1498Szrj }
330*38fd1498Szrj
331*38fd1498Szrj /* Find all sections in a COFF file. */
332*38fd1498Szrj
333*38fd1498Szrj 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)334*38fd1498Szrj simple_object_coff_find_sections (simple_object_read *sobj,
335*38fd1498Szrj int (*pfn) (void *, const char *,
336*38fd1498Szrj off_t offset, off_t length),
337*38fd1498Szrj void *data,
338*38fd1498Szrj int *err)
339*38fd1498Szrj {
340*38fd1498Szrj struct simple_object_coff_read *ocr =
341*38fd1498Szrj (struct simple_object_coff_read *) sobj->data;
342*38fd1498Szrj size_t scnhdr_size;
343*38fd1498Szrj unsigned char *scnbuf;
344*38fd1498Szrj const char *errmsg;
345*38fd1498Szrj unsigned int (*fetch_32) (const unsigned char *);
346*38fd1498Szrj unsigned int nscns;
347*38fd1498Szrj char *strtab;
348*38fd1498Szrj size_t strtab_size;
349*38fd1498Szrj unsigned int i;
350*38fd1498Szrj
351*38fd1498Szrj scnhdr_size = sizeof (struct external_scnhdr);
352*38fd1498Szrj scnbuf = XNEWVEC (unsigned char, scnhdr_size * ocr->nscns);
353*38fd1498Szrj if (!simple_object_internal_read (sobj->descriptor,
354*38fd1498Szrj sobj->offset + ocr->scnhdr_offset,
355*38fd1498Szrj scnbuf, scnhdr_size * ocr->nscns, &errmsg,
356*38fd1498Szrj err))
357*38fd1498Szrj {
358*38fd1498Szrj XDELETEVEC (scnbuf);
359*38fd1498Szrj return errmsg;
360*38fd1498Szrj }
361*38fd1498Szrj
362*38fd1498Szrj fetch_32 = (ocr->is_big_endian
363*38fd1498Szrj ? simple_object_fetch_big_32
364*38fd1498Szrj : simple_object_fetch_little_32);
365*38fd1498Szrj
366*38fd1498Szrj nscns = ocr->nscns;
367*38fd1498Szrj strtab = NULL;
368*38fd1498Szrj strtab_size = 0;
369*38fd1498Szrj for (i = 0; i < nscns; ++i)
370*38fd1498Szrj {
371*38fd1498Szrj unsigned char *scnhdr;
372*38fd1498Szrj unsigned char *scnname;
373*38fd1498Szrj char namebuf[SCNNMLEN + 1];
374*38fd1498Szrj char *name;
375*38fd1498Szrj off_t scnptr;
376*38fd1498Szrj unsigned int size;
377*38fd1498Szrj
378*38fd1498Szrj scnhdr = scnbuf + i * scnhdr_size;
379*38fd1498Szrj scnname = scnhdr + offsetof (struct external_scnhdr, s_name);
380*38fd1498Szrj memcpy (namebuf, scnname, SCNNMLEN);
381*38fd1498Szrj namebuf[SCNNMLEN] = '\0';
382*38fd1498Szrj name = &namebuf[0];
383*38fd1498Szrj if (namebuf[0] == '/')
384*38fd1498Szrj {
385*38fd1498Szrj size_t strindex;
386*38fd1498Szrj char *end;
387*38fd1498Szrj
388*38fd1498Szrj strindex = strtol (namebuf + 1, &end, 10);
389*38fd1498Szrj if (*end == '\0')
390*38fd1498Szrj {
391*38fd1498Szrj /* The real section name is found in the string
392*38fd1498Szrj table. */
393*38fd1498Szrj if (strtab == NULL)
394*38fd1498Szrj {
395*38fd1498Szrj strtab = simple_object_coff_read_strtab (sobj,
396*38fd1498Szrj &strtab_size,
397*38fd1498Szrj &errmsg, err);
398*38fd1498Szrj if (strtab == NULL)
399*38fd1498Szrj {
400*38fd1498Szrj XDELETEVEC (scnbuf);
401*38fd1498Szrj return errmsg;
402*38fd1498Szrj }
403*38fd1498Szrj }
404*38fd1498Szrj
405*38fd1498Szrj if (strindex < 4 || strindex >= strtab_size)
406*38fd1498Szrj {
407*38fd1498Szrj XDELETEVEC (strtab);
408*38fd1498Szrj XDELETEVEC (scnbuf);
409*38fd1498Szrj *err = 0;
410*38fd1498Szrj return "section string index out of range";
411*38fd1498Szrj }
412*38fd1498Szrj
413*38fd1498Szrj name = strtab + strindex;
414*38fd1498Szrj }
415*38fd1498Szrj }
416*38fd1498Szrj
417*38fd1498Szrj scnptr = fetch_32 (scnhdr + offsetof (struct external_scnhdr, s_scnptr));
418*38fd1498Szrj size = fetch_32 (scnhdr + offsetof (struct external_scnhdr, s_size));
419*38fd1498Szrj
420*38fd1498Szrj if (!(*pfn) (data, name, scnptr, size))
421*38fd1498Szrj break;
422*38fd1498Szrj }
423*38fd1498Szrj
424*38fd1498Szrj if (strtab != NULL)
425*38fd1498Szrj XDELETEVEC (strtab);
426*38fd1498Szrj XDELETEVEC (scnbuf);
427*38fd1498Szrj
428*38fd1498Szrj return NULL;
429*38fd1498Szrj }
430*38fd1498Szrj
431*38fd1498Szrj /* Fetch the attributes for an simple_object_read. */
432*38fd1498Szrj
433*38fd1498Szrj static void *
simple_object_coff_fetch_attributes(simple_object_read * sobj,const char ** errmsg ATTRIBUTE_UNUSED,int * err ATTRIBUTE_UNUSED)434*38fd1498Szrj simple_object_coff_fetch_attributes (simple_object_read *sobj,
435*38fd1498Szrj const char **errmsg ATTRIBUTE_UNUSED,
436*38fd1498Szrj int *err ATTRIBUTE_UNUSED)
437*38fd1498Szrj {
438*38fd1498Szrj struct simple_object_coff_read *ocr =
439*38fd1498Szrj (struct simple_object_coff_read *) sobj->data;
440*38fd1498Szrj struct simple_object_coff_attributes *ret;
441*38fd1498Szrj
442*38fd1498Szrj ret = XNEW (struct simple_object_coff_attributes);
443*38fd1498Szrj ret->magic = ocr->magic;
444*38fd1498Szrj ret->is_big_endian = ocr->is_big_endian;
445*38fd1498Szrj ret->flags = ocr->flags;
446*38fd1498Szrj return ret;
447*38fd1498Szrj }
448*38fd1498Szrj
449*38fd1498Szrj /* Release the private data for an simple_object_read. */
450*38fd1498Szrj
451*38fd1498Szrj static void
simple_object_coff_release_read(void * data)452*38fd1498Szrj simple_object_coff_release_read (void *data)
453*38fd1498Szrj {
454*38fd1498Szrj XDELETE (data);
455*38fd1498Szrj }
456*38fd1498Szrj
457*38fd1498Szrj /* Compare two attributes structures. */
458*38fd1498Szrj
459*38fd1498Szrj static const char *
simple_object_coff_attributes_merge(void * todata,void * fromdata,int * err)460*38fd1498Szrj simple_object_coff_attributes_merge (void *todata, void *fromdata, int *err)
461*38fd1498Szrj {
462*38fd1498Szrj struct simple_object_coff_attributes *to =
463*38fd1498Szrj (struct simple_object_coff_attributes *) todata;
464*38fd1498Szrj struct simple_object_coff_attributes *from =
465*38fd1498Szrj (struct simple_object_coff_attributes *) fromdata;
466*38fd1498Szrj
467*38fd1498Szrj if (to->magic != from->magic || to->is_big_endian != from->is_big_endian)
468*38fd1498Szrj {
469*38fd1498Szrj *err = 0;
470*38fd1498Szrj return "COFF object format mismatch";
471*38fd1498Szrj }
472*38fd1498Szrj return NULL;
473*38fd1498Szrj }
474*38fd1498Szrj
475*38fd1498Szrj /* Release the private data for an attributes structure. */
476*38fd1498Szrj
477*38fd1498Szrj static void
simple_object_coff_release_attributes(void * data)478*38fd1498Szrj simple_object_coff_release_attributes (void *data)
479*38fd1498Szrj {
480*38fd1498Szrj XDELETE (data);
481*38fd1498Szrj }
482*38fd1498Szrj
483*38fd1498Szrj /* Prepare to write out a file. */
484*38fd1498Szrj
485*38fd1498Szrj static void *
simple_object_coff_start_write(void * attributes_data,const char ** errmsg ATTRIBUTE_UNUSED,int * err ATTRIBUTE_UNUSED)486*38fd1498Szrj simple_object_coff_start_write (void *attributes_data,
487*38fd1498Szrj const char **errmsg ATTRIBUTE_UNUSED,
488*38fd1498Szrj int *err ATTRIBUTE_UNUSED)
489*38fd1498Szrj {
490*38fd1498Szrj struct simple_object_coff_attributes *attrs =
491*38fd1498Szrj (struct simple_object_coff_attributes *) attributes_data;
492*38fd1498Szrj struct simple_object_coff_attributes *ret;
493*38fd1498Szrj
494*38fd1498Szrj /* We're just going to record the attributes, but we need to make a
495*38fd1498Szrj copy because the user may delete them. */
496*38fd1498Szrj ret = XNEW (struct simple_object_coff_attributes);
497*38fd1498Szrj *ret = *attrs;
498*38fd1498Szrj return ret;
499*38fd1498Szrj }
500*38fd1498Szrj
501*38fd1498Szrj /* Write out a COFF filehdr. */
502*38fd1498Szrj
503*38fd1498Szrj 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)504*38fd1498Szrj simple_object_coff_write_filehdr (simple_object_write *sobj, int descriptor,
505*38fd1498Szrj unsigned int nscns, size_t symtab_offset,
506*38fd1498Szrj unsigned int nsyms, const char **errmsg,
507*38fd1498Szrj int *err)
508*38fd1498Szrj {
509*38fd1498Szrj struct simple_object_coff_attributes *attrs =
510*38fd1498Szrj (struct simple_object_coff_attributes *) sobj->data;
511*38fd1498Szrj unsigned char hdrbuf[sizeof (struct external_filehdr)];
512*38fd1498Szrj unsigned char *hdr;
513*38fd1498Szrj void (*set_16) (unsigned char *, unsigned short);
514*38fd1498Szrj void (*set_32) (unsigned char *, unsigned int);
515*38fd1498Szrj
516*38fd1498Szrj hdr = &hdrbuf[0];
517*38fd1498Szrj
518*38fd1498Szrj set_16 = (attrs->is_big_endian
519*38fd1498Szrj ? simple_object_set_big_16
520*38fd1498Szrj : simple_object_set_little_16);
521*38fd1498Szrj set_32 = (attrs->is_big_endian
522*38fd1498Szrj ? simple_object_set_big_32
523*38fd1498Szrj : simple_object_set_little_32);
524*38fd1498Szrj
525*38fd1498Szrj memset (hdr, 0, sizeof (struct external_filehdr));
526*38fd1498Szrj
527*38fd1498Szrj set_16 (hdr + offsetof (struct external_filehdr, f_magic), attrs->magic);
528*38fd1498Szrj set_16 (hdr + offsetof (struct external_filehdr, f_nscns), nscns);
529*38fd1498Szrj /* f_timdat left as zero. */
530*38fd1498Szrj set_32 (hdr + offsetof (struct external_filehdr, f_symptr), symtab_offset);
531*38fd1498Szrj set_32 (hdr + offsetof (struct external_filehdr, f_nsyms), nsyms);
532*38fd1498Szrj /* f_opthdr left as zero. */
533*38fd1498Szrj set_16 (hdr + offsetof (struct external_filehdr, f_flags), attrs->flags);
534*38fd1498Szrj
535*38fd1498Szrj return simple_object_internal_write (descriptor, 0, hdrbuf,
536*38fd1498Szrj sizeof (struct external_filehdr),
537*38fd1498Szrj errmsg, err);
538*38fd1498Szrj }
539*38fd1498Szrj
540*38fd1498Szrj /* Write out a COFF section header. */
541*38fd1498Szrj
542*38fd1498Szrj 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)543*38fd1498Szrj simple_object_coff_write_scnhdr (simple_object_write *sobj, int descriptor,
544*38fd1498Szrj const char *name, size_t *name_offset,
545*38fd1498Szrj off_t scnhdr_offset, size_t scnsize,
546*38fd1498Szrj off_t offset, unsigned int align,
547*38fd1498Szrj const char **errmsg, int *err)
548*38fd1498Szrj {
549*38fd1498Szrj struct simple_object_coff_attributes *attrs =
550*38fd1498Szrj (struct simple_object_coff_attributes *) sobj->data;
551*38fd1498Szrj void (*set_32) (unsigned char *, unsigned int);
552*38fd1498Szrj unsigned char hdrbuf[sizeof (struct external_scnhdr)];
553*38fd1498Szrj unsigned char *hdr;
554*38fd1498Szrj size_t namelen;
555*38fd1498Szrj unsigned int flags;
556*38fd1498Szrj
557*38fd1498Szrj set_32 = (attrs->is_big_endian
558*38fd1498Szrj ? simple_object_set_big_32
559*38fd1498Szrj : simple_object_set_little_32);
560*38fd1498Szrj
561*38fd1498Szrj memset (hdrbuf, 0, sizeof hdrbuf);
562*38fd1498Szrj hdr = &hdrbuf[0];
563*38fd1498Szrj
564*38fd1498Szrj namelen = strlen (name);
565*38fd1498Szrj if (namelen <= SCNNMLEN)
566*38fd1498Szrj strncpy ((char *) hdr + offsetof (struct external_scnhdr, s_name), name,
567*38fd1498Szrj SCNNMLEN);
568*38fd1498Szrj else
569*38fd1498Szrj {
570*38fd1498Szrj snprintf ((char *) hdr + offsetof (struct external_scnhdr, s_name),
571*38fd1498Szrj SCNNMLEN, "/%lu", (unsigned long) *name_offset);
572*38fd1498Szrj *name_offset += namelen + 1;
573*38fd1498Szrj }
574*38fd1498Szrj
575*38fd1498Szrj /* s_paddr left as zero. */
576*38fd1498Szrj /* s_vaddr left as zero. */
577*38fd1498Szrj set_32 (hdr + offsetof (struct external_scnhdr, s_size), scnsize);
578*38fd1498Szrj set_32 (hdr + offsetof (struct external_scnhdr, s_scnptr), offset);
579*38fd1498Szrj /* s_relptr left as zero. */
580*38fd1498Szrj /* s_lnnoptr left as zero. */
581*38fd1498Szrj /* s_nreloc left as zero. */
582*38fd1498Szrj /* s_nlnno left as zero. */
583*38fd1498Szrj flags = (STYP_DATA | IMAGE_SCN_MEM_DISCARDABLE | IMAGE_SCN_MEM_SHARED
584*38fd1498Szrj | IMAGE_SCN_MEM_READ);
585*38fd1498Szrj /* PE can represent alignment up to 13. */
586*38fd1498Szrj if (align > 13)
587*38fd1498Szrj align = 13;
588*38fd1498Szrj flags |= IMAGE_SCN_ALIGN_POWER_CONST(align);
589*38fd1498Szrj set_32 (hdr + offsetof (struct external_scnhdr, s_flags), flags);
590*38fd1498Szrj
591*38fd1498Szrj return simple_object_internal_write (descriptor, scnhdr_offset, hdrbuf,
592*38fd1498Szrj sizeof (struct external_scnhdr),
593*38fd1498Szrj errmsg, err);
594*38fd1498Szrj }
595*38fd1498Szrj
596*38fd1498Szrj /* Write out a complete COFF file. */
597*38fd1498Szrj
598*38fd1498Szrj static const char *
simple_object_coff_write_to_file(simple_object_write * sobj,int descriptor,int * err)599*38fd1498Szrj simple_object_coff_write_to_file (simple_object_write *sobj, int descriptor,
600*38fd1498Szrj int *err)
601*38fd1498Szrj {
602*38fd1498Szrj struct simple_object_coff_attributes *attrs =
603*38fd1498Szrj (struct simple_object_coff_attributes *) sobj->data;
604*38fd1498Szrj unsigned int nscns, secnum;
605*38fd1498Szrj simple_object_write_section *section;
606*38fd1498Szrj off_t scnhdr_offset;
607*38fd1498Szrj size_t symtab_offset;
608*38fd1498Szrj off_t secsym_offset;
609*38fd1498Szrj unsigned int nsyms;
610*38fd1498Szrj size_t offset;
611*38fd1498Szrj size_t name_offset;
612*38fd1498Szrj const char *errmsg;
613*38fd1498Szrj unsigned char strsizebuf[4];
614*38fd1498Szrj /* The interface doesn't give us access to the name of the input file
615*38fd1498Szrj yet. We want to use its basename for the FILE symbol. This is
616*38fd1498Szrj what 'gas' uses when told to assemble from stdin. */
617*38fd1498Szrj const char *source_filename = "fake";
618*38fd1498Szrj size_t sflen;
619*38fd1498Szrj union
620*38fd1498Szrj {
621*38fd1498Szrj struct external_syment sym;
622*38fd1498Szrj union external_auxent aux;
623*38fd1498Szrj } syms[2];
624*38fd1498Szrj void (*set_16) (unsigned char *, unsigned short);
625*38fd1498Szrj void (*set_32) (unsigned char *, unsigned int);
626*38fd1498Szrj
627*38fd1498Szrj set_16 = (attrs->is_big_endian
628*38fd1498Szrj ? simple_object_set_big_16
629*38fd1498Szrj : simple_object_set_little_16);
630*38fd1498Szrj set_32 = (attrs->is_big_endian
631*38fd1498Szrj ? simple_object_set_big_32
632*38fd1498Szrj : simple_object_set_little_32);
633*38fd1498Szrj
634*38fd1498Szrj nscns = 0;
635*38fd1498Szrj for (section = sobj->sections; section != NULL; section = section->next)
636*38fd1498Szrj ++nscns;
637*38fd1498Szrj
638*38fd1498Szrj scnhdr_offset = sizeof (struct external_filehdr);
639*38fd1498Szrj offset = scnhdr_offset + nscns * sizeof (struct external_scnhdr);
640*38fd1498Szrj name_offset = 4;
641*38fd1498Szrj for (section = sobj->sections; section != NULL; section = section->next)
642*38fd1498Szrj {
643*38fd1498Szrj size_t mask;
644*38fd1498Szrj size_t new_offset;
645*38fd1498Szrj size_t scnsize;
646*38fd1498Szrj struct simple_object_write_section_buffer *buffer;
647*38fd1498Szrj
648*38fd1498Szrj mask = (1U << section->align) - 1;
649*38fd1498Szrj new_offset = offset & mask;
650*38fd1498Szrj new_offset &= ~ mask;
651*38fd1498Szrj while (new_offset > offset)
652*38fd1498Szrj {
653*38fd1498Szrj unsigned char zeroes[16];
654*38fd1498Szrj size_t write;
655*38fd1498Szrj
656*38fd1498Szrj memset (zeroes, 0, sizeof zeroes);
657*38fd1498Szrj write = new_offset - offset;
658*38fd1498Szrj if (write > sizeof zeroes)
659*38fd1498Szrj write = sizeof zeroes;
660*38fd1498Szrj if (!simple_object_internal_write (descriptor, offset, zeroes, write,
661*38fd1498Szrj &errmsg, err))
662*38fd1498Szrj return errmsg;
663*38fd1498Szrj }
664*38fd1498Szrj
665*38fd1498Szrj scnsize = 0;
666*38fd1498Szrj for (buffer = section->buffers; buffer != NULL; buffer = buffer->next)
667*38fd1498Szrj {
668*38fd1498Szrj if (!simple_object_internal_write (descriptor, offset + scnsize,
669*38fd1498Szrj ((const unsigned char *)
670*38fd1498Szrj buffer->buffer),
671*38fd1498Szrj buffer->size, &errmsg, err))
672*38fd1498Szrj return errmsg;
673*38fd1498Szrj scnsize += buffer->size;
674*38fd1498Szrj }
675*38fd1498Szrj
676*38fd1498Szrj if (!simple_object_coff_write_scnhdr (sobj, descriptor, section->name,
677*38fd1498Szrj &name_offset, scnhdr_offset,
678*38fd1498Szrj scnsize, offset, section->align,
679*38fd1498Szrj &errmsg, err))
680*38fd1498Szrj return errmsg;
681*38fd1498Szrj
682*38fd1498Szrj scnhdr_offset += sizeof (struct external_scnhdr);
683*38fd1498Szrj offset += scnsize;
684*38fd1498Szrj }
685*38fd1498Szrj
686*38fd1498Szrj /* Symbol table is always half-word aligned. */
687*38fd1498Szrj offset += (offset & 1);
688*38fd1498Szrj /* There is a file symbol and a section symbol per section,
689*38fd1498Szrj and each of these has a single auxiliary symbol following. */
690*38fd1498Szrj nsyms = 2 * (nscns + 1);
691*38fd1498Szrj symtab_offset = offset;
692*38fd1498Szrj /* Advance across space reserved for symbol table to locate
693*38fd1498Szrj start of string table. */
694*38fd1498Szrj offset += nsyms * sizeof (struct external_syment);
695*38fd1498Szrj
696*38fd1498Szrj /* Write out file symbol. */
697*38fd1498Szrj memset (&syms[0], 0, sizeof (syms));
698*38fd1498Szrj strcpy ((char *)&syms[0].sym.e.e_name[0], ".file");
699*38fd1498Szrj set_16 (&syms[0].sym.e_scnum[0], IMAGE_SYM_DEBUG);
700*38fd1498Szrj set_16 (&syms[0].sym.e_type[0], IMAGE_SYM_TYPE);
701*38fd1498Szrj syms[0].sym.e_sclass[0] = IMAGE_SYM_CLASS_FILE;
702*38fd1498Szrj syms[0].sym.e_numaux[0] = 1;
703*38fd1498Szrj /* The name need not be nul-terminated if it fits into the x_fname field
704*38fd1498Szrj directly, but must be if it has to be placed into the string table. */
705*38fd1498Szrj sflen = strlen (source_filename);
706*38fd1498Szrj if (sflen <= E_FILNMLEN)
707*38fd1498Szrj memcpy (&syms[1].aux.x_file.x_fname[0], source_filename, sflen);
708*38fd1498Szrj else
709*38fd1498Szrj {
710*38fd1498Szrj set_32 (&syms[1].aux.x_file.x_n.x_offset[0], name_offset);
711*38fd1498Szrj if (!simple_object_internal_write (descriptor, offset + name_offset,
712*38fd1498Szrj ((const unsigned char *)
713*38fd1498Szrj source_filename),
714*38fd1498Szrj sflen + 1, &errmsg, err))
715*38fd1498Szrj return errmsg;
716*38fd1498Szrj name_offset += strlen (source_filename) + 1;
717*38fd1498Szrj }
718*38fd1498Szrj if (!simple_object_internal_write (descriptor, symtab_offset,
719*38fd1498Szrj (const unsigned char *) &syms[0],
720*38fd1498Szrj sizeof (syms), &errmsg, err))
721*38fd1498Szrj return errmsg;
722*38fd1498Szrj
723*38fd1498Szrj /* Write the string table length, followed by the strings and section
724*38fd1498Szrj symbols in step with each other. */
725*38fd1498Szrj set_32 (strsizebuf, name_offset);
726*38fd1498Szrj if (!simple_object_internal_write (descriptor, offset, strsizebuf, 4,
727*38fd1498Szrj &errmsg, err))
728*38fd1498Szrj return errmsg;
729*38fd1498Szrj
730*38fd1498Szrj name_offset = 4;
731*38fd1498Szrj secsym_offset = symtab_offset + sizeof (syms);
732*38fd1498Szrj memset (&syms[0], 0, sizeof (syms));
733*38fd1498Szrj set_16 (&syms[0].sym.e_type[0], IMAGE_SYM_TYPE);
734*38fd1498Szrj syms[0].sym.e_sclass[0] = IMAGE_SYM_CLASS_STATIC;
735*38fd1498Szrj syms[0].sym.e_numaux[0] = 1;
736*38fd1498Szrj secnum = 1;
737*38fd1498Szrj
738*38fd1498Szrj for (section = sobj->sections; section != NULL; section = section->next)
739*38fd1498Szrj {
740*38fd1498Szrj size_t namelen;
741*38fd1498Szrj size_t scnsize;
742*38fd1498Szrj struct simple_object_write_section_buffer *buffer;
743*38fd1498Szrj
744*38fd1498Szrj namelen = strlen (section->name);
745*38fd1498Szrj set_16 (&syms[0].sym.e_scnum[0], secnum++);
746*38fd1498Szrj scnsize = 0;
747*38fd1498Szrj for (buffer = section->buffers; buffer != NULL; buffer = buffer->next)
748*38fd1498Szrj scnsize += buffer->size;
749*38fd1498Szrj set_32 (&syms[1].aux.x_scn.x_scnlen[0], scnsize);
750*38fd1498Szrj if (namelen > SCNNMLEN)
751*38fd1498Szrj {
752*38fd1498Szrj set_32 (&syms[0].sym.e.e.e_zeroes[0], 0);
753*38fd1498Szrj set_32 (&syms[0].sym.e.e.e_offset[0], name_offset);
754*38fd1498Szrj if (!simple_object_internal_write (descriptor, offset + name_offset,
755*38fd1498Szrj ((const unsigned char *)
756*38fd1498Szrj section->name),
757*38fd1498Szrj namelen + 1, &errmsg, err))
758*38fd1498Szrj return errmsg;
759*38fd1498Szrj name_offset += namelen + 1;
760*38fd1498Szrj }
761*38fd1498Szrj else
762*38fd1498Szrj {
763*38fd1498Szrj memcpy (&syms[0].sym.e.e_name[0], section->name,
764*38fd1498Szrj strlen (section->name));
765*38fd1498Szrj memset (&syms[0].sym.e.e_name[strlen (section->name)], 0,
766*38fd1498Szrj E_SYMNMLEN - strlen (section->name));
767*38fd1498Szrj }
768*38fd1498Szrj
769*38fd1498Szrj if (!simple_object_internal_write (descriptor, secsym_offset,
770*38fd1498Szrj (const unsigned char *) &syms[0],
771*38fd1498Szrj sizeof (syms), &errmsg, err))
772*38fd1498Szrj return errmsg;
773*38fd1498Szrj secsym_offset += sizeof (syms);
774*38fd1498Szrj }
775*38fd1498Szrj
776*38fd1498Szrj if (!simple_object_coff_write_filehdr (sobj, descriptor, nscns,
777*38fd1498Szrj symtab_offset, nsyms, &errmsg, err))
778*38fd1498Szrj return errmsg;
779*38fd1498Szrj
780*38fd1498Szrj return NULL;
781*38fd1498Szrj }
782*38fd1498Szrj
783*38fd1498Szrj /* Release the private data for an simple_object_write structure. */
784*38fd1498Szrj
785*38fd1498Szrj static void
simple_object_coff_release_write(void * data)786*38fd1498Szrj simple_object_coff_release_write (void *data)
787*38fd1498Szrj {
788*38fd1498Szrj XDELETE (data);
789*38fd1498Szrj }
790*38fd1498Szrj
791*38fd1498Szrj /* The COFF functions. */
792*38fd1498Szrj
793*38fd1498Szrj const struct simple_object_functions simple_object_coff_functions =
794*38fd1498Szrj {
795*38fd1498Szrj simple_object_coff_match,
796*38fd1498Szrj simple_object_coff_find_sections,
797*38fd1498Szrj simple_object_coff_fetch_attributes,
798*38fd1498Szrj simple_object_coff_release_read,
799*38fd1498Szrj simple_object_coff_attributes_merge,
800*38fd1498Szrj simple_object_coff_release_attributes,
801*38fd1498Szrj simple_object_coff_start_write,
802*38fd1498Szrj simple_object_coff_write_to_file,
803*38fd1498Szrj simple_object_coff_release_write,
804*38fd1498Szrj NULL
805*38fd1498Szrj };
806