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[binutils.git] / include / coff / ti.h
bloba15fe717ab69084c2ce919268b3d5762363c08ba
1 /* COFF information for TI COFF support. Definitions in this file should be
2 customized in a target-specific file, and then this file included (see
3 tic54x.h for an example).
4
5 Copyright 2001, 2003 Free Software Foundation, Inc.
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
20 #ifndef COFF_TI_H
21 #define COFF_TI_H
22
23 /* Note "coff/external.h is not used because TI adds extra fields to the structures. */
24
25 /********************** FILE HEADER **********************/
26
27 struct external_filehdr
28 {
29 char f_magic[2]; /* magic number */
30 char f_nscns[2]; /* number of sections */
31 char f_timdat[4]; /* time & date stamp */
32 char f_symptr[4]; /* file pointer to symtab */
33 char f_nsyms[4]; /* number of symtab entries */
34 char f_opthdr[2]; /* sizeof(optional hdr) */
35 char f_flags[2]; /* flags */
36 char f_target_id[2]; /* magic no. (TI COFF-specific) */
37 };
38
39 /* COFF0 has magic number in f_magic, and omits f_target_id from the file
40 header; for later versions, f_magic is 0xC1 for COFF1 and 0xC2 for COFF2
41 and the target-specific magic number is found in f_target_id */
42
43 #define TICOFF0MAGIC TI_TARGET_ID
44 #define TICOFF1MAGIC 0x00C1
45 #define TICOFF2MAGIC 0x00C2
46 #define TICOFF_AOUT_MAGIC 0x0108 /* magic number in optional header */
47 #define TICOFF 1 /* customize coffcode.h */
48
49 /* The target_id field changes depending on the particular CPU target */
50 /* for COFF0, the target id appeared in f_magic, where COFFX magic is now */
51 #ifndef TI_TARGET_ID
52 #error "TI_TARGET_ID needs to be defined for your CPU"
53 #endif
54
55 /* Which bfd_arch to use... */
56 #ifndef TICOFF_TARGET_ARCH
57 #error "TICOFF_TARGET_ARCH needs to be defined for your CPU"
58 #endif
59
60 #ifndef TICOFF_TARGET_MACHINE_GET
61 #define TICOFF_TARGET_MACHINE_GET(FLAGS) 0
62 #endif
63
64 #ifndef TICOFF_TARGET_MACHINE_SET
65 #define TICOFF_TARGET_MACHINE_SET(FLAGSP, MACHINE)
66 #endif
67
68 /* Default to COFF2 for file output */
69 #ifndef TICOFF_DEFAULT_MAGIC
70 #define TICOFF_DEFAULT_MAGIC TICOFF2MAGIC
71 #endif
72
73 /* This value is made available in the rare case where a bfd is unavailable */
74 #ifndef OCTETS_PER_BYTE_POWER
75 #error "OCTETS_PER_BYTE_POWER not defined for this CPU"
76 #else
77 #define OCTETS_PER_BYTE (1<<OCTETS_PER_BYTE_POWER)
78 #endif
79
80 /* default alignment is on a byte (not octet!) boundary */
81 #ifndef COFF_DEFAULT_SECTION_ALIGNMENT_POWER
82 #define COFF_DEFAULT_SECTION_ALIGNMENT_POWER 0
83 #endif
84
85 /* TI COFF encodes the section alignment in the section header flags */
86 #define COFF_ALIGN_IN_SECTION_HEADER 1
87 #define COFF_ALIGN_IN_S_FLAGS 1
88 /* requires a power-of-two argument */
89 #define COFF_ENCODE_ALIGNMENT(S,X) ((S).s_flags |= (((unsigned)(X)&0xF)<<8))
90 /* result is a power of two */
91 #define COFF_DECODE_ALIGNMENT(X) (((X)>>8)&0xF)
92
93 #define COFF0_P(ABFD) (bfd_coff_filhsz(ABFD) == FILHSZ_V0)
94 #define COFF2_P(ABFD) (bfd_coff_scnhsz(ABFD) != SCNHSZ_V01)
95
96 #define COFF0_BADMAG(x) ((x).f_magic != TICOFF0MAGIC)
97 #define COFF1_BADMAG(x) ((x).f_magic != TICOFF1MAGIC || (x).f_target_id != TI_TARGET_ID)
98 #define COFF2_BADMAG(x) ((x).f_magic != TICOFF2MAGIC || (x).f_target_id != TI_TARGET_ID)
99
100 /* we need to read/write an extra field in the coff file header */
101 #ifndef COFF_ADJUST_FILEHDR_IN_POST
102 #define COFF_ADJUST_FILEHDR_IN_POST(abfd, src, dst) \
103 do \
104 { \
105 ((struct internal_filehdr *)(dst))->f_target_id = \
106 H_GET_16 (abfd, ((FILHDR *)(src))->f_target_id); \
107 } \
108 while (0)
109 #endif
110
111 #ifndef COFF_ADJUST_FILEHDR_OUT_POST
112 #define COFF_ADJUST_FILEHDR_OUT_POST(abfd, src, dst) \
113 do \
114 { \
115 H_PUT_16 (abfd, ((struct internal_filehdr *)(src))->f_target_id, \
116 ((FILHDR *)(dst))->f_target_id); \
117 } \
118 while (0)
119 #endif
120
121 #define FILHDR struct external_filehdr
122 #define FILHSZ 22
123 #define FILHSZ_V0 20 /* COFF0 omits target_id field */
124
125 /* File header flags */
126 #define F_RELFLG (0x0001)
127 #define F_EXEC (0x0002)
128 #define F_LNNO (0x0004)
129 #define F_VERS (0x0010) /* TMS320C4x code */
130 /* F_LSYMS needs to be redefined in your source file */
131 #define F_LSYMS_TICOFF (0x0010) /* normal COFF is 0x8 */
132
133 #define F_10 0x00 /* file built for TMS320C1x devices */
134 #define F_20 0x10 /* file built for TMS320C2x devices */
135 #define F_25 0x20 /* file built for TMS320C2x/C5x devices */
136 #define F_LENDIAN 0x0100 /* 16 bits/word, LSB first */
137 #define F_SYMMERGE 0x1000 /* duplicate symbols were removed */
138
139 /********************** OPTIONAL HEADER **********************/
140
141
142 typedef struct
143 {
144 char magic[2]; /* type of file (0x108) */
145 char vstamp[2]; /* version stamp */
146 char tsize[4]; /* text size in bytes, padded to FW bdry*/
147 char dsize[4]; /* initialized data " " */
148 char bsize[4]; /* uninitialized data " " */
149 char entry[4]; /* entry pt. */
150 char text_start[4]; /* base of text used for this file */
151 char data_start[4]; /* base of data used for this file */
152 }
153 AOUTHDR;
154
155
156 #define AOUTHDRSZ 28
157 #define AOUTSZ 28
158
159
160 /********************** SECTION HEADER **********************/
161 /* COFF0, COFF1 */
162 struct external_scnhdr_v01 {
163 char s_name[8]; /* section name */
164 char s_paddr[4]; /* physical address, aliased s_nlib */
165 char s_vaddr[4]; /* virtual address */
166 char s_size[4]; /* section size (in WORDS) */
167 char s_scnptr[4]; /* file ptr to raw data for section */
168 char s_relptr[4]; /* file ptr to relocation */
169 char s_lnnoptr[4]; /* file ptr to line numbers */
170 char s_nreloc[2]; /* number of relocation entries */
171 char s_nlnno[2]; /* number of line number entries*/
172 char s_flags[2]; /* flags */
173 char s_reserved[1]; /* reserved */
174 char s_page[1]; /* section page number (LOAD) */
175 };
176
177 /* COFF2 */
178 struct external_scnhdr {
179 char s_name[8]; /* section name */
180 char s_paddr[4]; /* physical address, aliased s_nlib */
181 char s_vaddr[4]; /* virtual address */
182 char s_size[4]; /* section size (in WORDS) */
183 char s_scnptr[4]; /* file ptr to raw data for section */
184 char s_relptr[4]; /* file ptr to relocation */
185 char s_lnnoptr[4]; /* file ptr to line numbers */
186 char s_nreloc[4]; /* number of relocation entries */
187 char s_nlnno[4]; /* number of line number entries*/
188 char s_flags[4]; /* flags */
189 char s_reserved[2]; /* reserved */
190 char s_page[2]; /* section page number (LOAD) */
191 };
192
193 /*
194 * Special section flags
195 */
196
197 /* TI COFF defines these flags;
198 STYP_CLINK: the section should be excluded from the final
199 linker output if there are no references found to any symbol in the section
200 STYP_BLOCK: the section should be blocked, i.e. if the section would cross
201 a page boundary, it is started at a page boundary instead.
202 TI COFF puts the section alignment power of two in the section flags
203 e.g. 2**N is alignment, flags |= (N & 0xF) << 8
204 */
205 #define STYP_CLINK (0x4000)
206 #define STYP_BLOCK (0x1000)
207 #define STYP_ALIGN (0x0F00) /* TI COFF stores section alignment here */
208
209 #define SCNHDR_V01 struct external_scnhdr_v01
210 #define SCNHDR struct external_scnhdr
211 #define SCNHSZ_V01 40 /* for v0 and v1 */
212 #define SCNHSZ 48
213
214 /* COFF2 changes the offsets and sizes of these fields
215 Assume we're dealing with the COFF2 scnhdr structure, and adjust
216 accordingly
217 */
218 #define GET_SCNHDR_NRELOC(ABFD, LOC) \
219 (COFF2_P (ABFD) ? H_GET_32 (ABFD, LOC) : H_GET_16 (ABFD, LOC))
220 #define PUT_SCNHDR_NRELOC(ABFD, VAL, LOC) \
221 (COFF2_P (ABFD) ? H_PUT_32 (ABFD, VAL, LOC) : H_PUT_16 (ABFD, VAL, LOC))
222 #define GET_SCNHDR_NLNNO(ABFD, LOC) \
223 (COFF2_P (ABFD) ? H_GET_32 (ABFD, LOC) : H_GET_16 (ABFD, (LOC) - 2))
224 #define PUT_SCNHDR_NLNNO(ABFD, VAL, LOC) \
225 (COFF2_P (ABFD) ? H_PUT_32 (ABFD, VAL, LOC) : H_PUT_16 (ABFD, VAL, (LOC) - 2))
226 #define GET_SCNHDR_FLAGS(ABFD, LOC) \
227 (COFF2_P (ABFD) ? H_GET_32 (ABFD, LOC) : H_GET_16 (ABFD, (LOC) - 4))
228 #define PUT_SCNHDR_FLAGS(ABFD, VAL, LOC) \
229 (COFF2_P (ABFD) ? H_PUT_32 (ABFD, VAL, LOC) : H_PUT_16 (ABFD, VAL, (LOC) - 4))
230 #define GET_SCNHDR_PAGE(ABFD, LOC) \
231 (COFF2_P (ABFD) ? H_GET_16 (ABFD, LOC) : (unsigned) H_GET_8 (ABFD, (LOC) - 7))
232 /* on output, make sure that the "reserved" field is zero */
233 #define PUT_SCNHDR_PAGE(ABFD, VAL, LOC) \
234 (COFF2_P (ABFD) \
235 ? H_PUT_16 (ABFD, VAL, LOC) \
236 : H_PUT_8 (ABFD, VAL, (LOC) - 7), H_PUT_8 (ABFD, 0, (LOC) - 8))
237
238 /* TI COFF stores section size as number of bytes (address units, not octets),
239 so adjust to be number of octets, which is what BFD expects */
240 #define GET_SCNHDR_SIZE(ABFD, SZP) \
241 (H_GET_32 (ABFD, SZP) * bfd_octets_per_byte (ABFD))
242 #define PUT_SCNHDR_SIZE(ABFD, SZ, SZP) \
243 H_PUT_32 (ABFD, (SZ) / bfd_octets_per_byte (ABFD), SZP)
244
245 #define COFF_ADJUST_SCNHDR_IN_POST(ABFD, EXT, INT) \
246 do \
247 { \
248 ((struct internal_scnhdr *)(INT))->s_page = \
249 GET_SCNHDR_PAGE (ABFD, ((SCNHDR *)(EXT))->s_page); \
250 } \
251 while (0)
252
253 /* The line number and reloc overflow checking in coff_swap_scnhdr_out in
254 coffswap.h doesn't use PUT_X for s_nlnno and s_nreloc.
255 Due to different sized v0/v1/v2 section headers, we have to re-write these
256 fields.
257 */
258 #define COFF_ADJUST_SCNHDR_OUT_POST(ABFD, INT, EXT) \
259 do \
260 { \
261 PUT_SCNHDR_NLNNO (ABFD, ((struct internal_scnhdr *)(INT))->s_nlnno, \
262 ((SCNHDR *)(EXT))->s_nlnno); \
263 PUT_SCNHDR_NRELOC (ABFD, ((struct internal_scnhdr *)(INT))->s_nreloc,\
264 ((SCNHDR *)(EXT))->s_nreloc); \
265 PUT_SCNHDR_FLAGS (ABFD, ((struct internal_scnhdr *)(INT))->s_flags, \
266 ((SCNHDR *)(EXT))->s_flags); \
267 PUT_SCNHDR_PAGE (ABFD, ((struct internal_scnhdr *)(INT))->s_page, \
268 ((SCNHDR *)(EXT))->s_page); \
269 } \
270 while (0)
271
272 /*
273 * names of "special" sections
274 */
275 #define _TEXT ".text"
276 #define _DATA ".data"
277 #define _BSS ".bss"
278 #define _CINIT ".cinit" /* initialized C data */
279 #define _SCONST ".const" /* constants */
280 #define _SWITCH ".switch" /* switch tables */
281 #define _STACK ".stack" /* C stack */
282 #define _SYSMEM ".sysmem" /* used for malloc et al. syscalls */
283
284 /********************** LINE NUMBERS **********************/
285
286 /* 1 line number entry for every "breakpointable" source line in a section.
287 * Line numbers are grouped on a per function basis; first entry in a function
288 * grouping will have l_lnno = 0 and in place of physical address will be the
289 * symbol table index of the function name.
290 */
291 struct external_lineno {
292 union {
293 char l_symndx[4]; /* function name symbol index, iff l_lnno == 0*/
294 char l_paddr[4]; /* (physical) address of line number */
295 } l_addr;
296 char l_lnno[2]; /* line number */
297 };
298
299 #define LINENO struct external_lineno
300 #define LINESZ 6
301
302
303 /********************** SYMBOLS **********************/
304
305 /* NOTE: this is what a local label looks like in assembly source; what it
306 looks like in COFF output is undefined */
307 #define TICOFF_LOCAL_LABEL_P(NAME) \
308 ((NAME[0] == '$' && NAME[1] >= '0' && NAME[1] <= '9' && NAME[2] == '\0') \
309 || NAME[strlen(NAME)-1] == '?')
310
311 #define E_SYMNMLEN 8 /* # characters in a symbol name */
312 #define E_FILNMLEN 14 /* # characters in a file name */
313 #define E_DIMNUM 4 /* # array dimensions in auxiliary entry */
314
315 struct external_syment
316 {
317 union {
318 char e_name[E_SYMNMLEN];
319 struct {
320 char e_zeroes[4];
321 char e_offset[4];
322 } e;
323 } e;
324 char e_value[4];
325 char e_scnum[2];
326 char e_type[2];
327 char e_sclass[1];
328 char e_numaux[1];
329 };
330
331
332 #define N_BTMASK (017)
333 #define N_TMASK (060)
334 #define N_BTSHFT (4)
335 #define N_TSHIFT (2)
336
337
338 union external_auxent {
339 struct {
340 char x_tagndx[4]; /* str, un, or enum tag indx */
341 union {
342 struct {
343 char x_lnno[2]; /* declaration line number */
344 char x_size[2]; /* str/union/array size */
345 } x_lnsz;
346 char x_fsize[4]; /* size of function */
347 } x_misc;
348 union {
349 struct { /* if ISFCN, tag, or .bb */
350 char x_lnnoptr[4]; /* ptr to fcn line # */
351 char x_endndx[4]; /* entry ndx past block end */
352 } x_fcn;
353 struct { /* if ISARY, up to 4 dimen. */
354 char x_dimen[E_DIMNUM][2];
355 } x_ary;
356 } x_fcnary;
357 char x_tvndx[2]; /* tv index */
358 } x_sym;
359
360 union {
361 char x_fname[E_FILNMLEN];
362 struct {
363 char x_zeroes[4];
364 char x_offset[4];
365 } x_n;
366 } x_file;
367
368 struct {
369 char x_scnlen[4]; /* section length */
370 char x_nreloc[2]; /* # relocation entries */
371 char x_nlinno[2]; /* # line numbers */
372 } x_scn;
373
374 struct {
375 char x_tvfill[4]; /* tv fill value */
376 char x_tvlen[2]; /* length of .tv */
377 char x_tvran[2][2]; /* tv range */
378 } x_tv; /* info about .tv section (in auxent of symbol .tv)) */
379
380
381 };
382
383 #define SYMENT struct external_syment
384 #define SYMESZ 18
385 #define AUXENT union external_auxent
386 #define AUXESZ 18
387
388 /* section lengths are in target bytes (not host bytes) */
389 #define GET_SCN_SCNLEN(ABFD, EXT) \
390 (H_GET_32 (ABFD, (EXT)->x_scn.x_scnlen) * bfd_octets_per_byte (ABFD))
391 #define PUT_SCN_SCNLEN(ABFD, INT, EXT) \
392 H_PUT_32 (ABFD, (INT) / bfd_octets_per_byte (ABFD), (EXT)->x_scn.x_scnlen)
393
394 /* lnsz size is in bits in COFF file, in bytes in BFD */
395 #define GET_LNSZ_SIZE(abfd, ext) \
396 (H_GET_16 (abfd, ext->x_sym.x_misc.x_lnsz.x_size) / (class != C_FIELD ? 8 : 1))
397
398 #define PUT_LNSZ_SIZE(abfd, in, ext) \
399 H_PUT_16 (abfd, ((class != C_FIELD) ? (in) * 8 : (in)), \
400 ext->x_sym.x_misc.x_lnsz.x_size)
401
402 /* TI COFF stores offsets for MOS and MOU in bits; BFD expects bytes
403 Also put the load page flag of the section into the symbol value if it's an
404 address. */
405 #ifndef NEEDS_PAGE
406 #define NEEDS_PAGE(X) 0
407 #define PAGE_MASK 0
408 #endif
409 #define COFF_ADJUST_SYM_IN_POST(ABFD, EXT, INT) \
410 do \
411 { \
412 struct internal_syment *dst = (struct internal_syment *)(INT); \
413 if (dst->n_sclass == C_MOS || dst->n_sclass == C_MOU) \
414 dst->n_value /= 8; \
415 else if (NEEDS_PAGE (dst->n_sclass)) { \
416 asection *scn = coff_section_from_bfd_index (abfd, dst->n_scnum); \
417 dst->n_value |= (scn->lma & PAGE_MASK); \
418 } \
419 } \
420 while (0)
421
422 #define COFF_ADJUST_SYM_OUT_POST(ABFD, INT, EXT) \
423 do \
424 { \
425 struct internal_syment *src = (struct internal_syment *)(INT); \
426 SYMENT *dst = (SYMENT *)(EXT); \
427 if (src->n_sclass == C_MOU || src->n_sclass == C_MOS) \
428 H_PUT_32 (abfd, src->n_value * 8, dst->e_value); \
429 else if (NEEDS_PAGE (src->n_sclass)) { \
430 H_PUT_32 (abfd, src->n_value &= ~PAGE_MASK, dst->e_value); \
431 } \
432 } \
433 while (0)
434
435 /* Detect section-relative absolute symbols so they get flagged with a sym
436 index of -1.
437 */
438 #define SECTION_RELATIVE_ABSOLUTE_SYMBOL_P(RELOC, SECT) \
439 ((*(RELOC)->sym_ptr_ptr)->section->output_section == (SECT) \
440 && (RELOC)->howto->name[0] == 'A')
441
442 /********************** RELOCATION DIRECTIVES **********************/
443
444 struct external_reloc_v0
445 {
446 char r_vaddr[4];
447 char r_symndx[2];
448 char r_reserved[2];
449 char r_type[2];
450 };
451
452 struct external_reloc
453 {
454 char r_vaddr[4];
455 char r_symndx[4];
456 char r_reserved[2]; /* extended pmad byte for COFF2 */
457 char r_type[2];
458 };
459
460 #define RELOC struct external_reloc
461 #define RELSZ_V0 10 /* FIXME -- coffcode.h needs fixing */
462 #define RELSZ 12 /* for COFF1/2 */
463
464 /* various relocation types. */
465 #define R_ABS 0x0000 /* no relocation */
466 #define R_REL13 0x002A /* 13-bit direct reference (???) */
467 #define R_PARTLS7 0x0028 /* 7 LSBs of an address */
468 #define R_PARTMS9 0x0029 /* 9MSBs of an address */
469 #define R_EXTWORD 0x002B /* 23-bit direct reference */
470 #define R_EXTWORD16 0x002C /* 16-bit direct reference to 23-bit addr*/
471 #define R_EXTWORDMS7 0x002D /* upper 7 bits of 23-bit address */
472
473 #endif /* COFF_TI_H */
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