Commit | Line | Data |
---|---|---|
284e0531 | 1 | /* seh pdata/xdata coff object file format |
681418c2 | 2 | Copyright 2009, 2010 |
284e0531 KT |
3 | Free Software Foundation, Inc. |
4 | ||
5 | This file is part of GAS. | |
6 | ||
7 | GAS 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 3, or (at your option) | |
10 | any later version. | |
11 | ||
12 | GAS 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 GAS; see the file COPYING. If not, write to the Free | |
19 | Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA | |
20 | 02110-1301, USA. */ | |
21 | ||
987499b2 KT |
22 | #include "obj-coff-seh.h" |
23 | ||
987499b2 | 24 | |
2d7f4929 KT |
25 | /* Private segment collection list. */ |
26 | struct seh_seg_list { | |
27 | segT seg; | |
28 | int subseg; | |
29 | char *seg_name; | |
30 | }; | |
31 | ||
987499b2 | 32 | /* Local data. */ |
987499b2 KT |
33 | static seh_context *seh_ctx_cur = NULL; |
34 | ||
2d7f4929 KT |
35 | static struct hash_control *seh_hash; |
36 | ||
37 | static struct seh_seg_list *x_segcur = NULL; | |
38 | static struct seh_seg_list *p_segcur = NULL; | |
681418c2 RH |
39 | |
40 | static void write_function_xdata (seh_context *); | |
41 | static void write_function_pdata (seh_context *); | |
604ab327 | 42 | |
681418c2 | 43 | \f |
2d7f4929 KT |
44 | /* Build based on segment the derived .pdata/.xdata |
45 | segment name containing origin segment's postfix name part. */ | |
46 | static char * | |
47 | get_pxdata_name (segT seg, const char *base_name) | |
987499b2 | 48 | { |
2d7f4929 KT |
49 | const char *name,*dollar, *dot; |
50 | char *sname; | |
51 | ||
52 | name = bfd_get_section_name (stdoutput, seg); | |
53 | ||
54 | dollar = strchr (name, '$'); | |
55 | dot = strchr (name + 1, '.'); | |
56 | ||
57 | if (!dollar && !dot) | |
58 | name = ""; | |
59 | else if (!dollar) | |
60 | name = dot; | |
61 | else if (!dot) | |
62 | name = dollar; | |
63 | else if (dot < dollar) | |
64 | name = dot; | |
65 | else | |
66 | name = dollar; | |
67 | ||
68 | sname = concat (base_name, name, NULL); | |
69 | ||
70 | return sname; | |
71 | } | |
72 | ||
73 | /* Allocate a seh_seg_list structure. */ | |
74 | static struct seh_seg_list * | |
75 | alloc_pxdata_item (segT seg, int subseg, char *name) | |
76 | { | |
77 | struct seh_seg_list *r; | |
78 | ||
79 | r = (struct seh_seg_list *) | |
80 | xmalloc (sizeof (struct seh_seg_list) + strlen (name)); | |
81 | r->seg = seg; | |
82 | r->subseg = subseg; | |
83 | r->seg_name = name; | |
84 | return r; | |
85 | } | |
86 | ||
87 | /* Generate pdata/xdata segment with same linkonce properties | |
88 | of based segment. */ | |
89 | static segT | |
90 | make_pxdata_seg (segT cseg, char *name) | |
91 | { | |
92 | segT save_seg = now_seg; | |
93 | int save_subseg = now_subseg; | |
94 | segT r; | |
95 | flagword flags; | |
96 | ||
97 | r = subseg_new (name, 0); | |
98 | /* Check if code segment is marked as linked once. */ | |
99 | flags = bfd_get_section_flags (stdoutput, cseg) | |
100 | & (SEC_LINK_ONCE | SEC_LINK_DUPLICATES_DISCARD | |
101 | | SEC_LINK_DUPLICATES_ONE_ONLY | SEC_LINK_DUPLICATES_SAME_SIZE | |
102 | | SEC_LINK_DUPLICATES_SAME_CONTENTS); | |
103 | ||
104 | /* Add standard section flags. */ | |
105 | flags |= SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_DATA; | |
106 | ||
107 | /* Apply possibly linked once flags to new generated segment, too. */ | |
108 | if (!bfd_set_section_flags (stdoutput, r, flags)) | |
109 | as_bad (_("bfd_set_section_flags: %s"), | |
110 | bfd_errmsg (bfd_get_error ())); | |
111 | ||
112 | /* Restore to previous segment. */ | |
113 | subseg_set (save_seg, save_subseg); | |
114 | return r; | |
987499b2 KT |
115 | } |
116 | ||
987499b2 | 117 | static void |
2d7f4929 KT |
118 | seh_hash_insert (const char *name, struct seh_seg_list *item) |
119 | { | |
120 | const char *error_string; | |
121 | ||
122 | if ((error_string = hash_jam (seh_hash, name, (char *) item))) | |
123 | as_fatal (_("Inserting \"%s\" into structure table failed: %s"), | |
124 | name, error_string); | |
125 | } | |
126 | ||
127 | static struct seh_seg_list * | |
128 | seh_hash_find (char *name) | |
987499b2 | 129 | { |
2d7f4929 KT |
130 | return (struct seh_seg_list *) hash_find (seh_hash, name); |
131 | } | |
132 | ||
133 | static struct seh_seg_list * | |
134 | seh_hash_find_or_make (segT cseg, const char *base_name) | |
135 | { | |
136 | struct seh_seg_list *item; | |
137 | char *name; | |
138 | ||
139 | /* Initialize seh_hash once. */ | |
140 | if (!seh_hash) | |
141 | seh_hash = hash_new (); | |
142 | ||
143 | name = get_pxdata_name (cseg, base_name); | |
144 | ||
145 | item = seh_hash_find (name); | |
146 | if (!item) | |
681418c2 | 147 | { |
2d7f4929 KT |
148 | item = alloc_pxdata_item (make_pxdata_seg (cseg, name), 0, name); |
149 | ||
150 | seh_hash_insert (item->seg_name, item); | |
681418c2 RH |
151 | } |
152 | else | |
2d7f4929 KT |
153 | free (name); |
154 | ||
155 | return item; | |
156 | } | |
157 | ||
158 | static void | |
159 | switch_xdata (int subseg, segT code_seg) | |
160 | { | |
161 | x_segcur = seh_hash_find_or_make (code_seg, ".xdata"); | |
162 | ||
163 | subseg_set (x_segcur->seg, subseg); | |
164 | } | |
165 | ||
166 | static void | |
167 | switch_pdata (segT code_seg) | |
168 | { | |
169 | p_segcur = seh_hash_find_or_make (code_seg, ".pdata"); | |
170 | ||
171 | subseg_set (p_segcur->seg, p_segcur->subseg); | |
681418c2 RH |
172 | } |
173 | \f | |
174 | /* Parsing routines. */ | |
987499b2 | 175 | |
681418c2 RH |
176 | /* Return the style of SEH unwind info to generate. */ |
177 | ||
178 | static seh_kind | |
179 | seh_get_target_kind (void) | |
180 | { | |
181 | if (!stdoutput) | |
182 | return seh_kind_unknown; | |
183 | switch (bfd_get_arch (stdoutput)) | |
987499b2 | 184 | { |
681418c2 RH |
185 | case bfd_arch_arm: |
186 | case bfd_arch_powerpc: | |
187 | case bfd_arch_sh: | |
188 | return seh_kind_arm; | |
189 | case bfd_arch_i386: | |
190 | switch (bfd_get_mach (stdoutput)) | |
987499b2 | 191 | { |
681418c2 RH |
192 | case bfd_mach_x86_64: |
193 | case bfd_mach_x86_64_intel_syntax: | |
194 | return seh_kind_x64; | |
195 | default: | |
196 | break; | |
987499b2 | 197 | } |
681418c2 RH |
198 | /* FALL THROUGH. */ |
199 | case bfd_arch_mips: | |
200 | return seh_kind_mips; | |
201 | case bfd_arch_ia64: | |
202 | /* Should return seh_kind_x64. But not implemented yet. */ | |
203 | return seh_kind_unknown; | |
987499b2 KT |
204 | default: |
205 | break; | |
206 | } | |
681418c2 | 207 | return seh_kind_unknown; |
987499b2 KT |
208 | } |
209 | ||
681418c2 RH |
210 | /* Verify that we're in the context of a seh_proc. */ |
211 | ||
212 | static int | |
213 | verify_context (const char *directive) | |
987499b2 | 214 | { |
681418c2 | 215 | if (seh_ctx_cur == NULL) |
987499b2 | 216 | { |
681418c2 RH |
217 | as_bad (_("%s used outside of .seh_proc block"), directive); |
218 | ignore_rest_of_line (); | |
219 | return 0; | |
987499b2 | 220 | } |
681418c2 RH |
221 | return 1; |
222 | } | |
987499b2 | 223 | |
681418c2 | 224 | /* Similar, except we also verify the appropriate target. */ |
987499b2 | 225 | |
681418c2 RH |
226 | static int |
227 | verify_context_and_target (const char *directive, seh_kind target) | |
228 | { | |
229 | if (seh_get_target_kind () != target) | |
987499b2 | 230 | { |
681418c2 RH |
231 | as_warn (_("%s ignored for this target"), directive); |
232 | ignore_rest_of_line (); | |
233 | return 0; | |
234 | } | |
235 | return verify_context (directive); | |
236 | } | |
237 | ||
238 | /* Skip whitespace and a comma. Error if the comma is not seen. */ | |
239 | ||
240 | static int | |
241 | skip_whitespace_and_comma (int required) | |
242 | { | |
243 | SKIP_WHITESPACE (); | |
244 | if (*input_line_pointer == ',') | |
245 | { | |
246 | input_line_pointer++; | |
247 | SKIP_WHITESPACE (); | |
248 | return 1; | |
987499b2 | 249 | } |
681418c2 RH |
250 | else if (required) |
251 | { | |
252 | as_bad (_("missing separator")); | |
253 | ignore_rest_of_line (); | |
254 | } | |
255 | else | |
256 | demand_empty_rest_of_line (); | |
257 | return 0; | |
987499b2 KT |
258 | } |
259 | ||
681418c2 | 260 | /* Mark current context to use 32-bit instruction (arm). */ |
1e17085d | 261 | |
987499b2 | 262 | static void |
681418c2 | 263 | obj_coff_seh_32 (int what) |
987499b2 | 264 | { |
681418c2 RH |
265 | if (!verify_context_and_target ((what ? ".seh_32" : ".seh_no32"), |
266 | seh_kind_arm)) | |
267 | return; | |
604ab327 | 268 | |
681418c2 RH |
269 | seh_ctx_cur->use_instruction_32 = (what ? 1 : 0); |
270 | demand_empty_rest_of_line (); | |
271 | } | |
272 | ||
273 | /* Set for current context the handler and optional data (arm). */ | |
274 | ||
275 | static void | |
276 | obj_coff_seh_eh (int what ATTRIBUTE_UNUSED) | |
277 | { | |
278 | if (!verify_context_and_target (".seh_eh", seh_kind_arm)) | |
987499b2 | 279 | return; |
681418c2 RH |
280 | |
281 | /* Write block to .text if exception handler is set. */ | |
282 | seh_ctx_cur->handler_written = 1; | |
283 | emit_expr (&seh_ctx_cur->handler, 4); | |
284 | emit_expr (&seh_ctx_cur->handler_data, 4); | |
285 | ||
286 | demand_empty_rest_of_line (); | |
987499b2 KT |
287 | } |
288 | ||
681418c2 RH |
289 | /* Set for current context the default handler (x64). */ |
290 | ||
987499b2 | 291 | static void |
681418c2 | 292 | obj_coff_seh_handler (int what ATTRIBUTE_UNUSED) |
987499b2 | 293 | { |
681418c2 RH |
294 | char *symbol_name; |
295 | char name_end; | |
296 | ||
297 | if (!verify_context (".seh_handler")) | |
987499b2 | 298 | return; |
681418c2 RH |
299 | |
300 | if (*input_line_pointer == 0 || *input_line_pointer == '\n') | |
301 | { | |
302 | as_bad (_(".seh_handler requires a handler")); | |
303 | demand_empty_rest_of_line (); | |
304 | return; | |
305 | } | |
306 | ||
307 | SKIP_WHITESPACE (); | |
308 | ||
309 | if (*input_line_pointer == '@') | |
987499b2 | 310 | { |
681418c2 RH |
311 | symbol_name = input_line_pointer; |
312 | name_end = get_symbol_end (); | |
313 | ||
314 | seh_ctx_cur->handler.X_op = O_constant; | |
315 | seh_ctx_cur->handler.X_add_number = 0; | |
316 | ||
317 | if (strcasecmp (symbol_name, "@0") == 0 | |
318 | || strcasecmp (symbol_name, "@null") == 0) | |
319 | ; | |
320 | else if (strcasecmp (symbol_name, "@1") == 0) | |
321 | seh_ctx_cur->handler.X_add_number = 1; | |
322 | else | |
323 | as_bad (_("unknown constant value '%s' for handler"), symbol_name); | |
324 | ||
325 | *input_line_pointer = name_end; | |
987499b2 | 326 | } |
681418c2 RH |
327 | else |
328 | expression (&seh_ctx_cur->handler); | |
987499b2 | 329 | |
681418c2 RH |
330 | seh_ctx_cur->handler_data.X_op = O_constant; |
331 | seh_ctx_cur->handler_data.X_add_number = 0; | |
332 | seh_ctx_cur->handler_flags = 0; | |
333 | ||
334 | if (!skip_whitespace_and_comma (0)) | |
987499b2 KT |
335 | return; |
336 | ||
681418c2 | 337 | if (seh_get_target_kind () == seh_kind_x64) |
987499b2 | 338 | { |
681418c2 | 339 | do |
987499b2 | 340 | { |
681418c2 RH |
341 | symbol_name = input_line_pointer; |
342 | name_end = get_symbol_end (); | |
343 | ||
344 | if (strcasecmp (symbol_name, "@unwind") == 0) | |
345 | seh_ctx_cur->handler_flags |= UNW_FLAG_UHANDLER; | |
346 | else if (strcasecmp (symbol_name, "@except") == 0) | |
347 | seh_ctx_cur->handler_flags |= UNW_FLAG_EHANDLER; | |
348 | else | |
349 | as_bad (_(".seh_handler constant '%s' unknown"), symbol_name); | |
350 | ||
351 | *input_line_pointer = name_end; | |
987499b2 | 352 | } |
681418c2 RH |
353 | while (skip_whitespace_and_comma (0)); |
354 | } | |
355 | else | |
356 | { | |
357 | expression (&seh_ctx_cur->handler_data); | |
358 | demand_empty_rest_of_line (); | |
359 | ||
360 | if (seh_ctx_cur->handler_written) | |
361 | as_warn (_(".seh_handler after .seh_eh is ignored")); | |
362 | } | |
363 | } | |
364 | ||
365 | /* Switch to subsection for handler data for exception region (x64). */ | |
366 | ||
367 | static void | |
368 | obj_coff_seh_handlerdata (int what ATTRIBUTE_UNUSED) | |
369 | { | |
370 | if (!verify_context_and_target (".seh_handlerdata", seh_kind_x64)) | |
371 | return; | |
372 | demand_empty_rest_of_line (); | |
373 | ||
2d7f4929 | 374 | switch_xdata (seh_ctx_cur->subsection + 1, seh_ctx_cur->code_seg); |
681418c2 RH |
375 | } |
376 | ||
377 | /* Mark end of current context. */ | |
378 | ||
379 | static void | |
380 | do_seh_endproc (void) | |
381 | { | |
382 | seh_ctx_cur->end_addr = symbol_temp_new_now (); | |
383 | ||
384 | write_function_xdata (seh_ctx_cur); | |
385 | write_function_pdata (seh_ctx_cur); | |
386 | seh_ctx_cur = NULL; | |
387 | } | |
388 | ||
389 | static void | |
390 | obj_coff_seh_endproc (int what ATTRIBUTE_UNUSED) | |
391 | { | |
392 | demand_empty_rest_of_line (); | |
393 | if (seh_ctx_cur == NULL) | |
394 | { | |
395 | as_bad (_(".seh_endproc used without .seh_proc")); | |
396 | return; | |
397 | } | |
398 | ||
399 | do_seh_endproc (); | |
400 | } | |
401 | ||
402 | /* Mark begin of new context. */ | |
403 | ||
404 | static void | |
405 | obj_coff_seh_proc (int what ATTRIBUTE_UNUSED) | |
406 | { | |
407 | char *symbol_name; | |
408 | char name_end; | |
409 | ||
410 | if (seh_ctx_cur != NULL) | |
411 | { | |
412 | as_bad (_("previous SEH entry not closed (missing .seh_endproc)")); | |
413 | do_seh_endproc (); | |
414 | } | |
415 | ||
416 | if (*input_line_pointer == 0 || *input_line_pointer == '\n') | |
417 | { | |
418 | as_bad (_(".seh_proc requires function label name")); | |
419 | demand_empty_rest_of_line (); | |
420 | return; | |
421 | } | |
422 | ||
423 | seh_ctx_cur = XCNEW (seh_context); | |
424 | ||
2d7f4929 KT |
425 | seh_ctx_cur->code_seg = now_seg; |
426 | ||
681418c2 RH |
427 | if (seh_get_target_kind () == seh_kind_x64) |
428 | { | |
2d7f4929 KT |
429 | x_segcur = seh_hash_find_or_make (seh_ctx_cur->code_seg, ".xdata"); |
430 | seh_ctx_cur->subsection = x_segcur->subseg; | |
431 | x_segcur->subseg += 2; | |
987499b2 | 432 | } |
681418c2 RH |
433 | |
434 | SKIP_WHITESPACE (); | |
435 | ||
436 | symbol_name = input_line_pointer; | |
437 | name_end = get_symbol_end (); | |
438 | seh_ctx_cur->func_name = xstrdup (symbol_name); | |
439 | *input_line_pointer = name_end; | |
440 | ||
441 | demand_empty_rest_of_line (); | |
442 | ||
443 | seh_ctx_cur->start_addr = symbol_temp_new_now (); | |
987499b2 KT |
444 | } |
445 | ||
681418c2 RH |
446 | /* Mark end of prologue for current context. */ |
447 | ||
448 | static void | |
449 | obj_coff_seh_endprologue (int what ATTRIBUTE_UNUSED) | |
450 | { | |
451 | if (!verify_context (".seh_endprologue")) | |
452 | return; | |
453 | demand_empty_rest_of_line (); | |
454 | ||
455 | if (seh_ctx_cur->endprologue_addr != NULL) | |
456 | as_warn (_("duplicate .seh_endprologue in .seh_proc block")); | |
457 | else | |
458 | seh_ctx_cur->endprologue_addr = symbol_temp_new_now (); | |
459 | } | |
460 | ||
461 | /* End-of-file hook. */ | |
462 | ||
987499b2 KT |
463 | void |
464 | obj_coff_seh_do_final (void) | |
465 | { | |
681418c2 | 466 | if (seh_ctx_cur != NULL) |
987499b2 | 467 | { |
681418c2 RH |
468 | as_bad (_("open SEH entry at end of file (missing .cfi_endproc)")); |
469 | do_seh_endproc (); | |
987499b2 KT |
470 | } |
471 | } | |
472 | ||
681418c2 RH |
473 | /* Enter a prologue element into current context (x64). */ |
474 | ||
987499b2 | 475 | static void |
681418c2 | 476 | seh_x64_make_prologue_element (int code, int info, offsetT off) |
987499b2 KT |
477 | { |
478 | seh_prologue_element *n; | |
604ab327 | 479 | |
987499b2 KT |
480 | if (seh_ctx_cur == NULL) |
481 | return; | |
482 | if (seh_ctx_cur->elems_count == seh_ctx_cur->elems_max) | |
483 | { | |
987499b2 | 484 | seh_ctx_cur->elems_max += 8; |
681418c2 RH |
485 | seh_ctx_cur->elems = XRESIZEVEC (seh_prologue_element, |
486 | seh_ctx_cur->elems, | |
487 | seh_ctx_cur->elems_max); | |
987499b2 | 488 | } |
681418c2 RH |
489 | |
490 | n = &seh_ctx_cur->elems[seh_ctx_cur->elems_count++]; | |
491 | n->code = code; | |
492 | n->info = info; | |
493 | n->off = off; | |
494 | n->pc_addr = symbol_temp_new_now (); | |
987499b2 KT |
495 | } |
496 | ||
681418c2 RH |
497 | /* Helper to read a register name from input stream (x64). */ |
498 | ||
987499b2 | 499 | static int |
681418c2 | 500 | seh_x64_read_reg (const char *directive, int kind) |
987499b2 | 501 | { |
681418c2 | 502 | static const char * const int_regs[16] = |
604ab327 NC |
503 | { "rax", "rcx", "rdx", "rbx", "rsp", "rbp","rsi","rdi", |
504 | "r8","r9","r10","r11","r12","r13","r14","r15" }; | |
681418c2 | 505 | static const char * const xmm_regs[16] = |
604ab327 NC |
506 | { "xmm0", "xmm1", "xmm2", "xmm3", "xmm4", "xmm5", "xmm6", "xmm7", |
507 | "xmm8", "xmm9", "xmm10","xmm11","xmm12","xmm13","xmm14","xmm15" }; | |
681418c2 RH |
508 | |
509 | const char * const *regs = NULL; | |
987499b2 KT |
510 | char name_end; |
511 | char *symbol_name = NULL; | |
512 | int i; | |
513 | ||
987499b2 | 514 | switch (kind) |
604ab327 NC |
515 | { |
516 | case 0: | |
604ab327 | 517 | case 1: |
681418c2 | 518 | regs = int_regs; |
604ab327 NC |
519 | break; |
520 | case 2: | |
681418c2 | 521 | regs = xmm_regs; |
604ab327 NC |
522 | break; |
523 | default: | |
524 | abort (); | |
525 | } | |
526 | ||
681418c2 | 527 | SKIP_WHITESPACE (); |
987499b2 KT |
528 | if (*input_line_pointer == '%') |
529 | ++input_line_pointer; | |
530 | symbol_name = input_line_pointer; | |
531 | name_end = get_symbol_end (); | |
604ab327 | 532 | |
987499b2 | 533 | for (i = 0; i < 16; i++) |
681418c2 | 534 | if (! strcasecmp (regs[i], symbol_name)) |
987499b2 | 535 | break; |
604ab327 | 536 | |
987499b2 | 537 | *input_line_pointer = name_end; |
987499b2 | 538 | |
681418c2 RH |
539 | /* Error if register not found, or EAX used as a frame pointer. */ |
540 | if (i == 16 || (kind == 0 && i == 0)) | |
604ab327 | 541 | { |
681418c2 RH |
542 | as_bad (_("invalid register for %s"), directive); |
543 | return -1; | |
604ab327 | 544 | } |
1e17085d | 545 | |
681418c2 | 546 | return i; |
987499b2 KT |
547 | } |
548 | ||
681418c2 RH |
549 | /* Add a register push-unwind token to the current context. */ |
550 | ||
987499b2 | 551 | static void |
681418c2 | 552 | obj_coff_seh_pushreg (int what ATTRIBUTE_UNUSED) |
987499b2 | 553 | { |
681418c2 RH |
554 | int reg; |
555 | ||
556 | if (!verify_context_and_target (".seh_pushreg", seh_kind_x64)) | |
557 | return; | |
558 | ||
559 | reg = seh_x64_read_reg (".seh_pushreg", 1); | |
987499b2 | 560 | demand_empty_rest_of_line (); |
681418c2 RH |
561 | |
562 | if (reg < 0) | |
563 | return; | |
564 | ||
565 | seh_x64_make_prologue_element (UWOP_PUSH_NONVOL, reg, 0); | |
987499b2 KT |
566 | } |
567 | ||
681418c2 RH |
568 | /* Add a register frame-unwind token to the current context. */ |
569 | ||
987499b2 | 570 | static void |
681418c2 | 571 | obj_coff_seh_pushframe (int what ATTRIBUTE_UNUSED) |
987499b2 | 572 | { |
681418c2 RH |
573 | if (!verify_context_and_target (".seh_pushframe", seh_kind_x64)) |
574 | return; | |
987499b2 | 575 | demand_empty_rest_of_line (); |
987499b2 | 576 | |
681418c2 | 577 | seh_x64_make_prologue_element (UWOP_PUSH_MACHFRAME, 0, 0); |
987499b2 KT |
578 | } |
579 | ||
681418c2 RH |
580 | /* Add a register save-unwind token to current context. */ |
581 | ||
987499b2 | 582 | static void |
681418c2 | 583 | obj_coff_seh_save (int what) |
987499b2 | 584 | { |
681418c2 RH |
585 | const char *directive = (what == 1 ? ".seh_savereg" : ".seh_savexmm"); |
586 | int code, reg, scale; | |
587 | offsetT off; | |
987499b2 | 588 | |
681418c2 RH |
589 | if (!verify_context_and_target (directive, seh_kind_x64)) |
590 | return; | |
987499b2 | 591 | |
681418c2 | 592 | reg = seh_x64_read_reg (directive, what); |
987499b2 | 593 | |
681418c2 RH |
594 | if (!skip_whitespace_and_comma (1)) |
595 | return; | |
987499b2 | 596 | |
681418c2 | 597 | off = get_absolute_expression (); |
987499b2 | 598 | demand_empty_rest_of_line (); |
987499b2 | 599 | |
681418c2 RH |
600 | if (reg < 0) |
601 | return; | |
602 | if (off < 0) | |
987499b2 | 603 | { |
681418c2 | 604 | as_bad (_("%s offset is negative"), directive); |
987499b2 KT |
605 | return; |
606 | } | |
607 | ||
681418c2 | 608 | scale = (what == 1 ? 8 : 16); |
987499b2 | 609 | |
6e0973c0 | 610 | if ((off & (scale - 1)) == 0 && off <= (offsetT) (0xffff * scale)) |
987499b2 | 611 | { |
681418c2 RH |
612 | code = (what == 1 ? UWOP_SAVE_NONVOL : UWOP_SAVE_XMM128); |
613 | off /= scale; | |
987499b2 | 614 | } |
6e0973c0 | 615 | else if (off < (offsetT) 0xffffffff) |
681418c2 RH |
616 | code = (what == 1 ? UWOP_SAVE_NONVOL_FAR : UWOP_SAVE_XMM128_FAR); |
617 | else | |
604ab327 | 618 | { |
681418c2 | 619 | as_bad (_("%s offset out of range"), directive); |
604ab327 NC |
620 | return; |
621 | } | |
681418c2 RH |
622 | |
623 | seh_x64_make_prologue_element (code, reg, off); | |
987499b2 KT |
624 | } |
625 | ||
681418c2 RH |
626 | /* Add a stack-allocation token to current context. */ |
627 | ||
987499b2 | 628 | static void |
681418c2 | 629 | obj_coff_seh_stackalloc (int what ATTRIBUTE_UNUSED) |
987499b2 | 630 | { |
681418c2 RH |
631 | offsetT off; |
632 | int code, info; | |
604ab327 | 633 | |
681418c2 RH |
634 | if (!verify_context_and_target (".seh_stackalloc", seh_kind_x64)) |
635 | return; | |
1e17085d | 636 | |
681418c2 | 637 | off = get_absolute_expression (); |
987499b2 | 638 | demand_empty_rest_of_line (); |
987499b2 | 639 | |
681418c2 RH |
640 | if (off == 0) |
641 | return; | |
642 | if (off < 0) | |
604ab327 | 643 | { |
681418c2 | 644 | as_bad (_(".seh_stackalloc offset is negative")); |
604ab327 NC |
645 | return; |
646 | } | |
987499b2 | 647 | |
681418c2 RH |
648 | if ((off & 7) == 0 && off <= 128) |
649 | code = UWOP_ALLOC_SMALL, info = (off - 8) >> 3, off = 0; | |
6e0973c0 | 650 | else if ((off & 7) == 0 && off <= (offsetT) (0xffff * 8)) |
681418c2 | 651 | code = UWOP_ALLOC_LARGE, info = 0, off >>= 3; |
6e0973c0 | 652 | else if (off <= (offsetT) 0xffffffff) |
681418c2 | 653 | code = UWOP_ALLOC_LARGE, info = 1; |
987499b2 | 654 | else |
604ab327 | 655 | { |
681418c2 | 656 | as_bad (_(".seh_stackalloc offset out of range")); |
604ab327 NC |
657 | return; |
658 | } | |
681418c2 RH |
659 | |
660 | seh_x64_make_prologue_element (code, info, off); | |
987499b2 KT |
661 | } |
662 | ||
681418c2 RH |
663 | /* Add a frame-pointer token to current context. */ |
664 | ||
987499b2 KT |
665 | static void |
666 | obj_coff_seh_setframe (int what ATTRIBUTE_UNUSED) | |
667 | { | |
681418c2 | 668 | offsetT off; |
987499b2 | 669 | int reg; |
987499b2 | 670 | |
681418c2 RH |
671 | if (!verify_context_and_target (".seh_setframe", seh_kind_x64)) |
672 | return; | |
673 | ||
674 | reg = seh_x64_read_reg (".seh_setframe", 0); | |
675 | ||
676 | if (!skip_whitespace_and_comma (1)) | |
677 | return; | |
678 | ||
679 | off = get_absolute_expression (); | |
680 | demand_empty_rest_of_line (); | |
681 | ||
682 | if (reg < 0) | |
683 | return; | |
684 | if (off < 0) | |
685 | as_bad (_(".seh_setframe offset is negative")); | |
686 | else if (off > 240) | |
687 | as_bad (_(".seh_setframe offset out of range")); | |
688 | else if (off & 15) | |
689 | as_bad (_(".seh_setframe offset not a multiple of 16")); | |
690 | else if (seh_ctx_cur->framereg != 0) | |
691 | as_bad (_("duplicate .seh_setframe in current .seh_proc")); | |
692 | else | |
604ab327 NC |
693 | { |
694 | seh_ctx_cur->framereg = reg; | |
695 | seh_ctx_cur->frameoff = off; | |
681418c2 | 696 | seh_x64_make_prologue_element (UWOP_SET_FPREG, 0, 0); |
604ab327 | 697 | } |
987499b2 | 698 | } |
681418c2 RH |
699 | \f |
700 | /* Data writing routines. */ | |
987499b2 | 701 | |
681418c2 | 702 | /* Output raw integers in 1, 2, or 4 bytes. */ |
987499b2 | 703 | |
681418c2 RH |
704 | static inline void |
705 | out_one (int byte) | |
987499b2 | 706 | { |
681418c2 | 707 | FRAG_APPEND_1_CHAR (byte); |
987499b2 KT |
708 | } |
709 | ||
681418c2 RH |
710 | static inline void |
711 | out_two (int data) | |
987499b2 | 712 | { |
681418c2 | 713 | md_number_to_chars (frag_more (2), data, 2); |
987499b2 KT |
714 | } |
715 | ||
681418c2 RH |
716 | static inline void |
717 | out_four (int data) | |
987499b2 | 718 | { |
681418c2 | 719 | md_number_to_chars (frag_more (4), data, 4); |
987499b2 KT |
720 | } |
721 | ||
681418c2 RH |
722 | /* Write out prologue data for x64. */ |
723 | ||
724 | static void | |
725 | seh_x64_write_prologue_data (const seh_context *c) | |
987499b2 | 726 | { |
681418c2 | 727 | int i; |
604ab327 | 728 | |
681418c2 RH |
729 | /* We have to store in reverse order. */ |
730 | for (i = c->elems_count - 1; i >= 0; --i) | |
731 | { | |
732 | const seh_prologue_element *e = c->elems + i; | |
733 | expressionS exp; | |
987499b2 | 734 | |
681418c2 RH |
735 | /* First comes byte offset in code. */ |
736 | exp.X_op = O_subtract; | |
737 | exp.X_add_symbol = e->pc_addr; | |
738 | exp.X_op_symbol = c->start_addr; | |
739 | exp.X_add_number = 0; | |
740 | emit_expr (&exp, 1); | |
987499b2 | 741 | |
681418c2 RH |
742 | /* Second comes code+info packed into a byte. */ |
743 | out_one ((e->info << 4) | e->code); | |
987499b2 | 744 | |
681418c2 | 745 | switch (e->code) |
987499b2 | 746 | { |
681418c2 RH |
747 | case UWOP_PUSH_NONVOL: |
748 | case UWOP_ALLOC_SMALL: | |
749 | case UWOP_SET_FPREG: | |
750 | case UWOP_PUSH_MACHFRAME: | |
751 | /* These have no extra data. */ | |
987499b2 | 752 | break; |
681418c2 RH |
753 | |
754 | case UWOP_ALLOC_LARGE: | |
755 | if (e->info) | |
756 | { | |
757 | case UWOP_SAVE_NONVOL_FAR: | |
758 | case UWOP_SAVE_XMM128_FAR: | |
759 | /* An unscaled 4 byte offset. */ | |
760 | out_four (e->off); | |
761 | break; | |
762 | } | |
763 | /* FALLTHRU */ | |
764 | ||
765 | case UWOP_SAVE_NONVOL: | |
766 | case UWOP_SAVE_XMM128: | |
767 | /* A scaled 2 byte offset. */ | |
768 | out_two (e->off); | |
769 | break; | |
770 | ||
771 | default: | |
772 | abort (); | |
987499b2 | 773 | } |
987499b2 | 774 | } |
987499b2 KT |
775 | } |
776 | ||
681418c2 RH |
777 | static int |
778 | seh_x64_size_prologue_data (const seh_context *c) | |
779 | { | |
780 | int i, ret = 0; | |
781 | ||
782 | for (i = c->elems_count - 1; i >= 0; --i) | |
783 | switch (c->elems[i].code) | |
784 | { | |
785 | case UWOP_PUSH_NONVOL: | |
786 | case UWOP_ALLOC_SMALL: | |
787 | case UWOP_SET_FPREG: | |
788 | case UWOP_PUSH_MACHFRAME: | |
789 | ret += 1; | |
790 | break; | |
987499b2 | 791 | |
681418c2 RH |
792 | case UWOP_SAVE_NONVOL: |
793 | case UWOP_SAVE_XMM128: | |
794 | ret += 2; | |
795 | break; | |
987499b2 | 796 | |
681418c2 RH |
797 | case UWOP_SAVE_NONVOL_FAR: |
798 | case UWOP_SAVE_XMM128_FAR: | |
799 | ret += 3; | |
800 | break; | |
987499b2 | 801 | |
681418c2 RH |
802 | case UWOP_ALLOC_LARGE: |
803 | ret += (c->elems[i].info ? 3 : 2); | |
804 | break; | |
987499b2 | 805 | |
681418c2 RH |
806 | default: |
807 | abort (); | |
808 | } | |
987499b2 | 809 | |
681418c2 | 810 | return ret; |
987499b2 KT |
811 | } |
812 | ||
681418c2 RH |
813 | /* Write out the xdata information for one function (x64). */ |
814 | ||
815 | static void | |
816 | seh_x64_write_function_xdata (seh_context *c) | |
987499b2 | 817 | { |
681418c2 RH |
818 | int flags, count_unwind_codes; |
819 | expressionS exp; | |
987499b2 | 820 | |
681418c2 RH |
821 | /* Set 4-byte alignment. */ |
822 | frag_align (2, 0, 0); | |
987499b2 | 823 | |
681418c2 RH |
824 | c->xdata_addr = symbol_temp_new_now (); |
825 | flags = c->handler_flags; | |
826 | count_unwind_codes = seh_x64_size_prologue_data (c); | |
987499b2 | 827 | |
681418c2 RH |
828 | /* ubyte:3 version, ubyte:5 flags. */ |
829 | out_one ((flags << 3) | 1); | |
987499b2 | 830 | |
681418c2 RH |
831 | /* Size of prologue. */ |
832 | if (c->endprologue_addr) | |
833 | { | |
834 | exp.X_op = O_subtract; | |
835 | exp.X_add_symbol = c->endprologue_addr; | |
836 | exp.X_op_symbol = c->start_addr; | |
837 | exp.X_add_number = 0; | |
838 | emit_expr (&exp, 1); | |
839 | } | |
840 | else | |
841 | out_one (0); | |
987499b2 | 842 | |
681418c2 RH |
843 | /* Number of slots (i.e. shorts) in the unwind codes array. */ |
844 | if (count_unwind_codes > 255) | |
845 | as_fatal (_("too much unwind data in this .seh_proc")); | |
846 | out_one (count_unwind_codes); | |
987499b2 | 847 | |
681418c2 RH |
848 | /* ubyte:4 frame-reg, ubyte:4 frame-reg-offset. */ |
849 | /* Note that frameoff is already a multiple of 16, and therefore | |
850 | the offset is already both scaled and shifted into place. */ | |
851 | out_one (c->frameoff | c->framereg); | |
604ab327 | 852 | |
681418c2 | 853 | seh_x64_write_prologue_data (c); |
987499b2 | 854 | |
681418c2 RH |
855 | /* We need to align prologue data. */ |
856 | if (count_unwind_codes & 1) | |
857 | out_two (0); | |
858 | ||
859 | if (flags & (UNW_FLAG_EHANDLER | UNW_FLAG_UHANDLER)) | |
604ab327 | 860 | { |
681418c2 RH |
861 | /* Force the use of segment-relative relocations instead of absolute |
862 | valued expressions. Don't adjust for constants (e.g. NULL). */ | |
863 | if (c->handler.X_op == O_symbol) | |
864 | c->handler.X_op = O_symbol_rva; | |
865 | emit_expr (&c->handler, 4); | |
604ab327 | 866 | } |
681418c2 RH |
867 | |
868 | /* Handler data will be tacked in here by subsections. */ | |
987499b2 KT |
869 | } |
870 | ||
681418c2 | 871 | /* Write out xdata for one function. */ |
987499b2 KT |
872 | |
873 | static void | |
681418c2 | 874 | write_function_xdata (seh_context *c) |
987499b2 | 875 | { |
681418c2 RH |
876 | segT save_seg = now_seg; |
877 | int save_subseg = now_subseg; | |
878 | ||
879 | /* MIPS, SH, ARM don't have xdata. */ | |
880 | if (seh_get_target_kind () != seh_kind_x64) | |
987499b2 | 881 | return; |
987499b2 | 882 | |
2d7f4929 | 883 | switch_xdata (c->subsection, c->code_seg); |
987499b2 | 884 | |
681418c2 | 885 | seh_x64_write_function_xdata (c); |
1e17085d | 886 | |
681418c2 | 887 | subseg_set (save_seg, save_subseg); |
1e17085d KT |
888 | } |
889 | ||
681418c2 | 890 | /* Write pdata section data for one function (arm). */ |
987499b2 | 891 | |
681418c2 RH |
892 | static void |
893 | seh_arm_write_function_pdata (seh_context *c) | |
987499b2 | 894 | { |
681418c2 RH |
895 | expressionS exp; |
896 | unsigned int prol_len = 0, func_len = 0; | |
897 | unsigned int val; | |
604ab327 | 898 | |
681418c2 RH |
899 | /* Start address of the function. */ |
900 | exp.X_op = O_symbol; | |
901 | exp.X_add_symbol = c->start_addr; | |
902 | exp.X_add_number = 0; | |
903 | emit_expr (&exp, 4); | |
904 | ||
905 | exp.X_op = O_subtract; | |
906 | exp.X_add_symbol = c->end_addr; | |
907 | exp.X_op_symbol = c->start_addr; | |
908 | exp.X_add_number = 0; | |
909 | if (resolve_expression (&exp) && exp.X_op == O_constant) | |
910 | func_len = exp.X_add_number; | |
987499b2 | 911 | else |
681418c2 RH |
912 | as_bad (_(".seh_endproc in a different section from .seh_proc")); |
913 | ||
914 | if (c->endprologue_addr) | |
987499b2 | 915 | { |
681418c2 RH |
916 | exp.X_op = O_subtract; |
917 | exp.X_add_symbol = c->endprologue_addr; | |
918 | exp.X_op_symbol = c->start_addr; | |
919 | exp.X_add_number = 0; | |
920 | ||
921 | if (resolve_expression (&exp) && exp.X_op == O_constant) | |
922 | prol_len = exp.X_add_number; | |
923 | else | |
924 | as_bad (_(".seh_endprologue in a different section from .seh_proc")); | |
987499b2 | 925 | } |
681418c2 RH |
926 | |
927 | /* Both function and prologue are in units of instructions. */ | |
928 | func_len >>= (c->use_instruction_32 ? 2 : 1); | |
929 | prol_len >>= (c->use_instruction_32 ? 2 : 1); | |
930 | ||
931 | /* Assemble the second word of the pdata. */ | |
932 | val = prol_len & 0xff; | |
933 | val |= (func_len & 0x3fffff) << 8; | |
934 | if (c->use_instruction_32) | |
935 | val |= 0x40000000U; | |
936 | if (c->handler_written) | |
937 | val |= 0x80000000U; | |
938 | out_four (val); | |
987499b2 KT |
939 | } |
940 | ||
681418c2 RH |
941 | /* Write out pdata for one function. */ |
942 | ||
987499b2 | 943 | static void |
681418c2 | 944 | write_function_pdata (seh_context *c) |
987499b2 | 945 | { |
681418c2 RH |
946 | expressionS exp; |
947 | segT save_seg = now_seg; | |
948 | int save_subseg = now_subseg; | |
2d7f4929 KT |
949 | memset (&exp, 0, sizeof (expressionS)); |
950 | switch_pdata (c->code_seg); | |
681418c2 RH |
951 | |
952 | switch (seh_get_target_kind ()) | |
987499b2 | 953 | { |
681418c2 RH |
954 | case seh_kind_x64: |
955 | exp.X_op = O_symbol_rva; | |
956 | exp.X_add_number = 0; | |
957 | ||
958 | exp.X_add_symbol = c->start_addr; | |
959 | emit_expr (&exp, 4); | |
2d7f4929 KT |
960 | exp.X_op = O_symbol_rva; |
961 | exp.X_add_number = 0; | |
681418c2 RH |
962 | exp.X_add_symbol = c->end_addr; |
963 | emit_expr (&exp, 4); | |
2d7f4929 KT |
964 | exp.X_op = O_symbol_rva; |
965 | exp.X_add_number = 0; | |
681418c2 RH |
966 | exp.X_add_symbol = c->xdata_addr; |
967 | emit_expr (&exp, 4); | |
968 | break; | |
987499b2 | 969 | |
681418c2 RH |
970 | case seh_kind_mips: |
971 | exp.X_op = O_symbol; | |
972 | exp.X_add_number = 0; | |
987499b2 | 973 | |
681418c2 RH |
974 | exp.X_add_symbol = c->start_addr; |
975 | emit_expr (&exp, 4); | |
976 | exp.X_add_symbol = c->end_addr; | |
977 | emit_expr (&exp, 4); | |
987499b2 | 978 | |
681418c2 RH |
979 | emit_expr (&c->handler, 4); |
980 | emit_expr (&c->handler_data, 4); | |
604ab327 | 981 | |
681418c2 RH |
982 | exp.X_add_symbol = (c->endprologue_addr |
983 | ? c->endprologue_addr | |
984 | : c->start_addr); | |
985 | emit_expr (&exp, 4); | |
986 | break; | |
987499b2 | 987 | |
681418c2 RH |
988 | case seh_kind_arm: |
989 | seh_arm_write_function_pdata (c); | |
990 | break; | |
604ab327 | 991 | |
681418c2 RH |
992 | default: |
993 | abort (); | |
987499b2 | 994 | } |
681418c2 RH |
995 | |
996 | subseg_set (save_seg, save_subseg); | |
987499b2 | 997 | } |