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gdb: add target_ops::supports_displaced_step
[deliverable/binutils-gdb.git] / gdb / i386-nbsd-tdep.c
CommitLineData
ed504bdf
MK		 1/* Target-dependent code for NetBSD/i386.
2
b811d2c2 3 Copyright (C) 1988-2020 Free Software Foundation, Inc.
0fc93e6b
C		 4
5 This file is part of GDB.
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
a9762ec7 9 the Free Software Foundation; either version 3 of the License, or
0fc93e6b
C		 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
a9762ec7 18 along with this program. If not, see <http://www.gnu.org/licenses/>. */
0fc93e6b
C		 19
20#include "defs.h"
13739f4d 21#include "arch-utils.h"
911bc6ee 22#include "frame.h"
dfe6eb1f
JT		 23#include "gdbcore.h"
24#include "regcache.h"
13739f4d 25#include "regset.h"
4be87837 26#include "osabi.h"
911bc6ee 27#include "symtab.h"
70f13f6b
MK		 28#include "trad-frame.h"
29#include "tramp-frame.h"
0fc93e6b 30
3cac699e 31#include "i386-tdep.h"
dfe6eb1f 32#include "i387-tdep.h"
3cac699e 33#include "nbsd-tdep.h"
7d400e77
JT		 34#include "solib-svr4.h"
35
13739f4d
MK		 36/* From <machine/reg.h>. */
37static int i386nbsd_r_reg_offset[] =
dfe6eb1f 38{
13739f4d
MK		 39 0 * 4, /* %eax */
40 1 * 4, /* %ecx */
41 2 * 4, /* %edx */
42 3 * 4, /* %ebx */
43 4 * 4, /* %esp */
44 5 * 4, /* %ebp */
45 6 * 4, /* %esi */
46 7 * 4, /* %edi */
47 8 * 4, /* %eip */
48 9 * 4, /* %eflags */
49 10 * 4, /* %cs */
50 11 * 4, /* %ss */
51 12 * 4, /* %ds */
52 13 * 4, /* %es */
53 14 * 4, /* %fs */
54 15 * 4 /* %gs */
dfe6eb1f
JT		 55};
56
3cac699e 57/* From <machine/signal.h>. */
13739f4d 58int i386nbsd_sc_reg_offset[] =
a3386186
MK		 59{
60 10 * 4, /* %eax */
61 9 * 4, /* %ecx */
62 8 * 4, /* %edx */
63 7 * 4, /* %ebx */
64 14 * 4, /* %esp */
65 6 * 4, /* %ebp */
66 5 * 4, /* %esi */
67 4 * 4, /* %edi */
68 11 * 4, /* %eip */
69 13 * 4, /* %eflags */
70 12 * 4, /* %cs */
71 15 * 4, /* %ss */
72 3 * 4, /* %ds */
73 2 * 4, /* %es */
74 1 * 4, /* %fs */
75 0 * 4 /* %gs */
76};
3cac699e 77
70f13f6b
MK		 78/* From <machine/mcontext.h>. */
79int i386nbsd_mc_reg_offset[] =
80{
81 11 * 4, /* %eax */
82 10 * 4, /* %ecx */
83 9 * 4, /* %edx */
84 8 * 4, /* %ebx */
85 7 * 4, /* %esp */
86 6 * 4, /* %ebp */
87 5 * 4, /* %esi */
88 4 * 4, /* %edi */
89 14 * 4, /* %eip */
90 16 * 4, /* %eflags */
91 15 * 4, /* %cs */
92 18 * 4, /* %ss */
93 3 * 4, /* %ds */
94 2 * 4, /* %es */
95 1 * 4, /* %fs */
96 0 * 4 /* %gs */
97};
98
99static void i386nbsd_sigtramp_cache_init (const struct tramp_frame *,
100 struct frame_info *,
101 struct trad_frame_cache *,
102 CORE_ADDR);
103
104static const struct tramp_frame i386nbsd_sigtramp_sc16 =
105{
106 SIGTRAMP_FRAME,
107 1,
108 {
7bc02706
TT		 109 /* leal 0x10(%esp), %eax */
110 { 0x8d, ULONGEST_MAX },
111 { 0x44, ULONGEST_MAX },
112 { 0x24, ULONGEST_MAX },
113 { 0x10, ULONGEST_MAX },
114
115 /* pushl %eax */
116 { 0x50, ULONGEST_MAX },
117
118 /* pushl %eax */
119 { 0x50, ULONGEST_MAX },
120
121 /* movl $0x127, %eax # __sigreturn14 */
122 { 0xb8, ULONGEST_MAX },
123 { 0x27, ULONGEST_MAX },
124 {0x01, ULONGEST_MAX },
125 {0x00, ULONGEST_MAX },
126 {0x00, ULONGEST_MAX },
127
128 /* int $0x80 */
129 { 0xcd, ULONGEST_MAX },
130 { 0x80, ULONGEST_MAX},
131
132 /* movl $0x1, %eax # exit */
133 { 0xb8, ULONGEST_MAX },
134 { 0x01, ULONGEST_MAX },
135 {0x00, ULONGEST_MAX },
136 {0x00, ULONGEST_MAX },
137 {0x00, ULONGEST_MAX },
138
139 /* int $0x80 */
140 { 0xcd, ULONGEST_MAX },
141 { 0x80, ULONGEST_MAX},
142
143 { TRAMP_SENTINEL_INSN, ULONGEST_MAX }
70f13f6b
MK		 144 },
145 i386nbsd_sigtramp_cache_init
146};
147
148static const struct tramp_frame i386nbsd_sigtramp_sc2 =
149{
150 SIGTRAMP_FRAME,
151 1,
152 {
7bc02706
TT		 153 /* leal 0x0c(%esp), %eax */
154 { 0x8d, ULONGEST_MAX },
155 { 0x44, ULONGEST_MAX },
156 { 0x24, ULONGEST_MAX },
157 { 0x0c, ULONGEST_MAX },
158 /* movl %eax, 0x4(%esp) */
159 { 0x89, ULONGEST_MAX },
160 { 0x44, ULONGEST_MAX },
161 { 0x24, ULONGEST_MAX },
162 { 0x04, ULONGEST_MAX },
163 /* movl $0x127, %eax # __sigreturn14 */
164 { 0xb8, ULONGEST_MAX },
165 { 0x27, ULONGEST_MAX },
166 {0x01, ULONGEST_MAX },
167 {0x00, ULONGEST_MAX },
168 {0x00, ULONGEST_MAX },
169 /* int $0x80 */
170 { 0xcd, ULONGEST_MAX },
171 { 0x80, ULONGEST_MAX},
172 /* movl %eax, 0x4(%esp) */
173 { 0x89, ULONGEST_MAX },
174 { 0x44, ULONGEST_MAX },
175 { 0x24, ULONGEST_MAX },
176 { 0x04, ULONGEST_MAX },
177 /* movl $0x1, %eax */
178 { 0xb8, ULONGEST_MAX },
179 { 0x01, ULONGEST_MAX },
180 {0x00, ULONGEST_MAX },
181 {0x00, ULONGEST_MAX },
182 {0x00, ULONGEST_MAX },
183 /* int $0x80 */
184 { 0xcd, ULONGEST_MAX },
185 { 0x80, ULONGEST_MAX},
186 { TRAMP_SENTINEL_INSN, ULONGEST_MAX }
70f13f6b
MK		 187 },
188 i386nbsd_sigtramp_cache_init
189};
190
191static const struct tramp_frame i386nbsd_sigtramp_si2 =
192{
193 SIGTRAMP_FRAME,
194 1,
195 {
7bc02706
TT		 196 /* movl 8(%esp),%eax */
197 { 0x8b, ULONGEST_MAX },
198 { 0x44, ULONGEST_MAX },
199 { 0x24, ULONGEST_MAX },
200 { 0x08, ULONGEST_MAX },
201 /* movl %eax, 0x4(%esp) */
202 { 0x89, ULONGEST_MAX },
203 { 0x44, ULONGEST_MAX },
204 { 0x24, ULONGEST_MAX },
205 { 0x04, ULONGEST_MAX },
206 /* movl $0x134, %eax # setcontext */
207 { 0xb8, ULONGEST_MAX },
208 { 0x34, ULONGEST_MAX },
209 { 0x01, ULONGEST_MAX },
210 { 0x00, ULONGEST_MAX },
211 { 0x00, ULONGEST_MAX },
212 /* int $0x80 */
213 { 0xcd, ULONGEST_MAX },
214 { 0x80, ULONGEST_MAX },
215 /* movl %eax, 0x4(%esp) */
216 { 0x89, ULONGEST_MAX },
217 { 0x44, ULONGEST_MAX },
218 { 0x24, ULONGEST_MAX },
219 { 0x04, ULONGEST_MAX },
220 /* movl $0x1, %eax */
221 { 0xb8, ULONGEST_MAX },
222 { 0x01, ULONGEST_MAX },
223 { 0x00, ULONGEST_MAX },
224 { 0x00, ULONGEST_MAX },
225 { 0x00, ULONGEST_MAX },
226 /* int $0x80 */
227 { 0xcd, ULONGEST_MAX },
228 { 0x80, ULONGEST_MAX },
229 { TRAMP_SENTINEL_INSN, ULONGEST_MAX }
70f13f6b
MK		 230 },
231 i386nbsd_sigtramp_cache_init
232};
233
234static const struct tramp_frame i386nbsd_sigtramp_si31 =
235{
236 SIGTRAMP_FRAME,
237 1,
238 {
7bc02706
TT		 239 /* leal 0x8c(%esp), %eax */
240 { 0x8d, ULONGEST_MAX },
241 { 0x84, ULONGEST_MAX },
242 { 0x24, ULONGEST_MAX },
243 { 0x8c, ULONGEST_MAX },
244 { 0x00, ULONGEST_MAX },
245 { 0x00, ULONGEST_MAX },
246 { 0x00, ULONGEST_MAX },
247 /* movl %eax, 0x4(%esp) */
248 { 0x89, ULONGEST_MAX },
249 { 0x44, ULONGEST_MAX },
250 { 0x24, ULONGEST_MAX },
251 { 0x04, ULONGEST_MAX },
252 /* movl $0x134, %eax # setcontext */
253 { 0xb8, ULONGEST_MAX },
254 { 0x34, ULONGEST_MAX },
255 { 0x01, ULONGEST_MAX },
256 { 0x00, ULONGEST_MAX },
257 { 0x00, ULONGEST_MAX },
258 /* int $0x80 */
259 { 0xcd, ULONGEST_MAX },
260 { 0x80, ULONGEST_MAX},
261 /* movl %eax, 0x4(%esp) */
262 { 0x89, ULONGEST_MAX },
263 { 0x44, ULONGEST_MAX },
264 { 0x24, ULONGEST_MAX },
265 { 0x04, ULONGEST_MAX },
266 /* movl $0x1, %eax */
267 { 0xb8, ULONGEST_MAX },
268 { 0x01, ULONGEST_MAX },
269 {0x00, ULONGEST_MAX },
270 {0x00, ULONGEST_MAX },
271 {0x00, ULONGEST_MAX },
272 /* int $0x80 */
273 { 0xcd, ULONGEST_MAX },
274 { 0x80, ULONGEST_MAX},
275 { TRAMP_SENTINEL_INSN, ULONGEST_MAX }
70f13f6b
MK		 276 },
277 i386nbsd_sigtramp_cache_init
278};
279
280static const struct tramp_frame i386nbsd_sigtramp_si4 =
281{
282 SIGTRAMP_FRAME,
283 1,
284 {
7bc02706
TT		 285 /* leal 0x8c(%esp), %eax */
286 { 0x8d, ULONGEST_MAX },
287 { 0x84, ULONGEST_MAX },
288 { 0x24, ULONGEST_MAX },
289 { 0x8c, ULONGEST_MAX },
290 { 0x00, ULONGEST_MAX },
291 { 0x00, ULONGEST_MAX },
292 { 0x00, ULONGEST_MAX },
293 /* movl %eax, 0x4(%esp) */
294 { 0x89, ULONGEST_MAX },
295 { 0x44, ULONGEST_MAX },
296 { 0x24, ULONGEST_MAX },
297 { 0x04, ULONGEST_MAX },
298 /* movl $0x134, %eax # setcontext */
299 { 0xb8, ULONGEST_MAX },
300 { 0x34, ULONGEST_MAX },
301 { 0x01, ULONGEST_MAX },
302 { 0x00, ULONGEST_MAX },
303 { 0x00, ULONGEST_MAX },
304 /* int $0x80 */
305 { 0xcd, ULONGEST_MAX },
306 { 0x80, ULONGEST_MAX},
307 /* movl $0xffffffff,0x4(%esp) */
308 { 0xc7, ULONGEST_MAX },
309 { 0x44, ULONGEST_MAX },
310 { 0x24, ULONGEST_MAX },
311 { 0x04, ULONGEST_MAX },
312 { 0xff, ULONGEST_MAX },
313 { 0xff, ULONGEST_MAX },
314 { 0xff, ULONGEST_MAX },
315 { 0xff, ULONGEST_MAX },
316 /* movl $0x1, %eax */
317 { 0xb8, ULONGEST_MAX },
318 { 0x01, ULONGEST_MAX },
319 {0x00, ULONGEST_MAX },
320 {0x00, ULONGEST_MAX },
321 {0x00, ULONGEST_MAX },
322 /* int $0x80 */
323 { 0xcd, ULONGEST_MAX },
324 { 0x80, ULONGEST_MAX},
325 { TRAMP_SENTINEL_INSN, ULONGEST_MAX }
70f13f6b
MK		 326 },
327 i386nbsd_sigtramp_cache_init
328};
329
330static void
331i386nbsd_sigtramp_cache_init (const struct tramp_frame *self,
10458914
DJ		 332 struct frame_info *this_frame,
333 struct trad_frame_cache *this_cache,
334 CORE_ADDR func)
70f13f6b 335{
10458914 336 struct gdbarch *gdbarch = get_frame_arch (this_frame);
e17a4113 337 enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
10458914 338 CORE_ADDR sp = get_frame_register_unsigned (this_frame, I386_ESP_REGNUM);
70f13f6b
MK		 339 CORE_ADDR base;
340 int *reg_offset;
341 int num_regs;
342 int i;
343
344 if (self == &i386nbsd_sigtramp_sc16 || self == &i386nbsd_sigtramp_sc2)
345 {
346 reg_offset = i386nbsd_sc_reg_offset;
347 num_regs = ARRAY_SIZE (i386nbsd_sc_reg_offset);
348
1777feb0 349 /* Read in the sigcontext address. */
e17a4113 350 base = read_memory_unsigned_integer (sp + 8, 4, byte_order);
70f13f6b
MK		 351 }
352 else
353 {
354 reg_offset = i386nbsd_mc_reg_offset;
355 num_regs = ARRAY_SIZE (i386nbsd_mc_reg_offset);
356
1777feb0 357 /* Read in the ucontext address. */
e17a4113 358 base = read_memory_unsigned_integer (sp + 8, 4, byte_order);
70f13f6b
MK		 359 /* offsetof(ucontext_t, uc_mcontext) == 36 */
360 base += 36;
361 }
362
363 for (i = 0; i < num_regs; i++)
364 if (reg_offset[i] != -1)
365 trad_frame_set_reg_addr (this_cache, i, base + reg_offset[i]);
366
367 /* Construct the frame ID using the function start. */
368 trad_frame_set_id (this_cache, frame_id_build (sp, func));
369}
370\f
371
3cac699e
JT		 372static void
373i386nbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
374{
375 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
376
377 /* Obviously NetBSD is BSD-based. */
378 i386bsd_init_abi (info, gdbarch);
379
79743962
KR		 380 nbsd_init_abi (info, gdbarch);
381
13739f4d
MK		 382 /* NetBSD has a different `struct reg'. */
383 tdep->gregset_reg_offset = i386nbsd_r_reg_offset;
384 tdep->gregset_num_regs = ARRAY_SIZE (i386nbsd_r_reg_offset);
385 tdep->sizeof_gregset = 16 * 4;
386
3cac699e
JT		 387 /* NetBSD uses -freg-struct-return by default. */
388 tdep->struct_return = reg_struct_return;
389
1777feb0 390 /* NetBSD uses tramp_frame sniffers for signal trampolines. */
70f13f6b
MK		 391 tdep->sigcontext_addr= 0;
392 tdep->sigtramp_start = 0;
393 tdep->sigtramp_end = 0;
394 tdep->sigtramp_p = 0;
395 tdep->sc_reg_offset = 0;
396 tdep->sc_num_regs = 0;
397
398 tramp_frame_prepend_unwinder (gdbarch, &i386nbsd_sigtramp_sc16);
399 tramp_frame_prepend_unwinder (gdbarch, &i386nbsd_sigtramp_sc2);
400 tramp_frame_prepend_unwinder (gdbarch, &i386nbsd_sigtramp_si2);
401 tramp_frame_prepend_unwinder (gdbarch, &i386nbsd_sigtramp_si31);
402 tramp_frame_prepend_unwinder (gdbarch, &i386nbsd_sigtramp_si4);
13739f4d
MK		 403}
404
3cac699e 405/* NetBSD ELF. */
13739f4d 406
3cac699e
JT		 407static void
408i386nbsdelf_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
409{
410 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
411
412 /* It's still NetBSD. */
413 i386nbsd_init_abi (info, gdbarch);
414
415 /* But ELF-based. */
416 i386_elf_init_abi (info, gdbarch);
417
418 /* NetBSD ELF uses SVR4-style shared libraries. */
13739f4d 419 set_solib_svr4_fetch_link_map_offsets
7e654c37 420 (gdbarch, svr4_ilp32_fetch_link_map_offsets);
3cac699e
JT		 421
422 /* NetBSD ELF uses -fpcc-struct-return by default. */
423 tdep->struct_return = pcc_struct_return;
3cac699e
JT		 424}
425
6c265988 426void _initialize_i386nbsd_tdep ();
dfe6eb1f 427void
6c265988 428_initialize_i386nbsd_tdep ()
dfe6eb1f 429{
1736a7bd 430 gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_NETBSD,
3cac699e 431 i386nbsdelf_init_abi);
dfe6eb1f 432}
GDB Binutils - Deliverables
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