Commit | Line | Data |
---|---|---|
005328e3 | 1 | /* Target-dependent code for OpenBSD/i386. |
67457012 | 2 | |
28e7fd62 | 3 | Copyright (C) 1988-2013 Free Software Foundation, Inc. |
005328e3 MK |
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 |
005328e3 MK |
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/>. */ |
005328e3 MK |
19 | |
20 | #include "defs.h" | |
21 | #include "arch-utils.h" | |
911bc6ee | 22 | #include "frame.h" |
508fbfea | 23 | #include "frame-unwind.h" |
005328e3 MK |
24 | #include "gdbcore.h" |
25 | #include "regcache.h" | |
67457012 | 26 | #include "regset.h" |
911bc6ee MK |
27 | #include "symtab.h" |
28 | #include "objfiles.h" | |
4be87837 | 29 | #include "osabi.h" |
5d93ae8c | 30 | #include "target.h" |
508fbfea | 31 | #include "trad-frame.h" |
005328e3 | 32 | |
67457012 MK |
33 | #include "gdb_assert.h" |
34 | #include "gdb_string.h" | |
35 | ||
005328e3 MK |
36 | #include "i386-tdep.h" |
37 | #include "i387-tdep.h" | |
60a6eeb6 | 38 | #include "solib-svr4.h" |
a28109e0 | 39 | #include "bsd-uthread.h" |
005328e3 | 40 | |
5d93ae8c MK |
41 | /* Support for signal handlers. */ |
42 | ||
43 | /* Since OpenBSD 3.2, the sigtramp routine is mapped at a random page | |
44 | in virtual memory. The randomness makes it somewhat tricky to | |
45 | detect it, but fortunately we can rely on the fact that the start | |
3ed85247 MK |
46 | of the sigtramp routine is page-aligned. We recognize the |
47 | trampoline by looking for the code that invokes the sigreturn | |
48 | system call. The offset where we can find that code varies from | |
49 | release to release. | |
50 | ||
51 | By the way, the mapping mentioned above is read-only, so you cannot | |
52 | place a breakpoint in the signal trampoline. */ | |
5d93ae8c MK |
53 | |
54 | /* Default page size. */ | |
55 | static const int i386obsd_page_size = 4096; | |
56 | ||
3ed85247 MK |
57 | /* Offset for sigreturn(2). */ |
58 | static const int i386obsd_sigreturn_offset[] = { | |
59 | 0x0a, /* OpenBSD 3.2 */ | |
60 | 0x14, /* OpenBSD 3.6 */ | |
61 | 0x3a, /* OpenBSD 3.8 */ | |
62 | -1 | |
63 | }; | |
64 | ||
10458914 DJ |
65 | /* Return whether THIS_FRAME corresponds to an OpenBSD sigtramp |
66 | routine. */ | |
5d93ae8c MK |
67 | |
68 | static int | |
10458914 | 69 | i386obsd_sigtramp_p (struct frame_info *this_frame) |
5d93ae8c | 70 | { |
10458914 | 71 | CORE_ADDR pc = get_frame_pc (this_frame); |
5d93ae8c | 72 | CORE_ADDR start_pc = (pc & ~(i386obsd_page_size - 1)); |
3ed85247 | 73 | /* The call sequence invoking sigreturn(2). */ |
63c0089f | 74 | const gdb_byte sigreturn[] = |
5d93ae8c MK |
75 | { |
76 | 0xb8, | |
77 | 0x67, 0x00, 0x00, 0x00, /* movl $SYS_sigreturn, %eax */ | |
78 | 0xcd, 0x80 /* int $0x80 */ | |
79 | }; | |
c822af0c | 80 | size_t buflen = sizeof sigreturn; |
3ed85247 | 81 | const int *offset; |
63c0089f | 82 | gdb_byte *buf; |
2c02bd72 | 83 | const char *name; |
5d93ae8c | 84 | |
911bc6ee MK |
85 | /* If the function has a valid symbol name, it isn't a |
86 | trampoline. */ | |
87 | find_pc_partial_function (pc, &name, NULL, NULL); | |
88 | if (name != NULL) | |
89 | return 0; | |
90 | ||
91 | /* If the function lives in a valid section (even without a starting | |
92 | point) it isn't a trampoline. */ | |
93 | if (find_pc_section (pc) != NULL) | |
5d93ae8c MK |
94 | return 0; |
95 | ||
9c8e3411 | 96 | /* Allocate buffer. */ |
c822af0c | 97 | buf = alloca (buflen); |
9c8e3411 | 98 | |
3ed85247 MK |
99 | /* Loop over all offsets. */ |
100 | for (offset = i386obsd_sigreturn_offset; *offset != -1; offset++) | |
101 | { | |
102 | /* If we can't read the instructions, return zero. */ | |
10458914 | 103 | if (!safe_frame_unwind_memory (this_frame, start_pc + *offset, |
3ed85247 MK |
104 | buf, buflen)) |
105 | return 0; | |
106 | ||
107 | /* Check for sigreturn(2). */ | |
108 | if (memcmp (buf, sigreturn, buflen) == 0) | |
109 | return 1; | |
110 | } | |
9c8e3411 | 111 | |
911bc6ee | 112 | return 0; |
5d93ae8c MK |
113 | } |
114 | \f | |
115 | /* Mapping between the general-purpose registers in `struct reg' | |
116 | format and GDB's register cache layout. */ | |
117 | ||
67457012 MK |
118 | /* From <machine/reg.h>. */ |
119 | static int i386obsd_r_reg_offset[] = | |
120 | { | |
121 | 0 * 4, /* %eax */ | |
122 | 1 * 4, /* %ecx */ | |
123 | 2 * 4, /* %edx */ | |
124 | 3 * 4, /* %ebx */ | |
125 | 4 * 4, /* %esp */ | |
126 | 5 * 4, /* %ebp */ | |
127 | 6 * 4, /* %esi */ | |
128 | 7 * 4, /* %edi */ | |
129 | 8 * 4, /* %eip */ | |
130 | 9 * 4, /* %eflags */ | |
131 | 10 * 4, /* %cs */ | |
132 | 11 * 4, /* %ss */ | |
133 | 12 * 4, /* %ds */ | |
134 | 13 * 4, /* %es */ | |
135 | 14 * 4, /* %fs */ | |
136 | 15 * 4 /* %gs */ | |
137 | }; | |
005328e3 MK |
138 | |
139 | static void | |
67457012 MK |
140 | i386obsd_aout_supply_regset (const struct regset *regset, |
141 | struct regcache *regcache, int regnum, | |
142 | const void *regs, size_t len) | |
005328e3 | 143 | { |
9ea75c57 | 144 | const struct gdbarch_tdep *tdep = gdbarch_tdep (regset->arch); |
3ed85247 | 145 | const gdb_byte *gregs = regs; |
67457012 MK |
146 | |
147 | gdb_assert (len >= tdep->sizeof_gregset + I387_SIZEOF_FSAVE); | |
005328e3 | 148 | |
67457012 | 149 | i386_supply_gregset (regset, regcache, regnum, regs, tdep->sizeof_gregset); |
3ed85247 | 150 | i387_supply_fsave (regcache, regnum, gregs + tdep->sizeof_gregset); |
005328e3 MK |
151 | } |
152 | ||
49cfa46f | 153 | static const struct regset * |
67457012 MK |
154 | i386obsd_aout_regset_from_core_section (struct gdbarch *gdbarch, |
155 | const char *sect_name, | |
156 | size_t sect_size) | |
005328e3 | 157 | { |
67457012 | 158 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
005328e3 | 159 | |
67457012 MK |
160 | /* OpenBSD a.out core dumps don't use seperate register sets for the |
161 | general-purpose and floating-point registers. */ | |
005328e3 | 162 | |
67457012 MK |
163 | if (strcmp (sect_name, ".reg") == 0 |
164 | && sect_size >= tdep->sizeof_gregset + I387_SIZEOF_FSAVE) | |
005328e3 | 165 | { |
67457012 | 166 | if (tdep->gregset == NULL) |
9ea75c57 MK |
167 | tdep->gregset = |
168 | regset_alloc (gdbarch, i386obsd_aout_supply_regset, NULL); | |
67457012 | 169 | return tdep->gregset; |
005328e3 MK |
170 | } |
171 | ||
67457012 | 172 | return NULL; |
005328e3 | 173 | } |
005328e3 MK |
174 | \f |
175 | ||
5d93ae8c MK |
176 | /* Sigtramp routine location for OpenBSD 3.1 and earlier releases. */ |
177 | CORE_ADDR i386obsd_sigtramp_start_addr = 0xbfbfdf20; | |
178 | CORE_ADDR i386obsd_sigtramp_end_addr = 0xbfbfdff0; | |
005328e3 MK |
179 | |
180 | /* From <machine/signal.h>. */ | |
a3386186 MK |
181 | int i386obsd_sc_reg_offset[I386_NUM_GREGS] = |
182 | { | |
183 | 10 * 4, /* %eax */ | |
184 | 9 * 4, /* %ecx */ | |
185 | 8 * 4, /* %edx */ | |
186 | 7 * 4, /* %ebx */ | |
187 | 14 * 4, /* %esp */ | |
188 | 6 * 4, /* %ebp */ | |
189 | 5 * 4, /* %esi */ | |
190 | 4 * 4, /* %edi */ | |
191 | 11 * 4, /* %eip */ | |
192 | 13 * 4, /* %eflags */ | |
193 | 12 * 4, /* %cs */ | |
194 | 15 * 4, /* %ss */ | |
195 | 3 * 4, /* %ds */ | |
196 | 2 * 4, /* %es */ | |
197 | 1 * 4, /* %fs */ | |
198 | 0 * 4 /* %gs */ | |
199 | }; | |
005328e3 | 200 | |
a28109e0 MK |
201 | /* From /usr/src/lib/libpthread/arch/i386/uthread_machdep.c. */ |
202 | static int i386obsd_uthread_reg_offset[] = | |
203 | { | |
204 | 11 * 4, /* %eax */ | |
205 | 10 * 4, /* %ecx */ | |
206 | 9 * 4, /* %edx */ | |
207 | 8 * 4, /* %ebx */ | |
208 | -1, /* %esp */ | |
209 | 6 * 4, /* %ebp */ | |
210 | 5 * 4, /* %esi */ | |
211 | 4 * 4, /* %edi */ | |
212 | 12 * 4, /* %eip */ | |
213 | -1, /* %eflags */ | |
214 | 13 * 4, /* %cs */ | |
215 | -1, /* %ss */ | |
216 | 3 * 4, /* %ds */ | |
217 | 2 * 4, /* %es */ | |
218 | 1 * 4, /* %fs */ | |
219 | 0 * 4 /* %gs */ | |
220 | }; | |
221 | ||
222 | /* Offset within the thread structure where we can find the saved | |
223 | stack pointer (%esp). */ | |
224 | #define I386OBSD_UTHREAD_ESP_OFFSET 176 | |
225 | ||
226 | static void | |
227 | i386obsd_supply_uthread (struct regcache *regcache, | |
228 | int regnum, CORE_ADDR addr) | |
229 | { | |
e17a4113 UW |
230 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
231 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
a28109e0 MK |
232 | CORE_ADDR sp_addr = addr + I386OBSD_UTHREAD_ESP_OFFSET; |
233 | CORE_ADDR sp = 0; | |
63c0089f | 234 | gdb_byte buf[4]; |
a28109e0 MK |
235 | int i; |
236 | ||
237 | gdb_assert (regnum >= -1); | |
238 | ||
239 | if (regnum == -1 || regnum == I386_ESP_REGNUM) | |
240 | { | |
241 | int offset; | |
242 | ||
243 | /* Fetch stack pointer from thread structure. */ | |
e17a4113 | 244 | sp = read_memory_unsigned_integer (sp_addr, 4, byte_order); |
a28109e0 MK |
245 | |
246 | /* Adjust the stack pointer such that it looks as if we just | |
247 | returned from _thread_machdep_switch. */ | |
248 | offset = i386obsd_uthread_reg_offset[I386_EIP_REGNUM] + 4; | |
e17a4113 | 249 | store_unsigned_integer (buf, 4, byte_order, sp + offset); |
a28109e0 MK |
250 | regcache_raw_supply (regcache, I386_ESP_REGNUM, buf); |
251 | } | |
252 | ||
253 | for (i = 0; i < ARRAY_SIZE (i386obsd_uthread_reg_offset); i++) | |
254 | { | |
255 | if (i386obsd_uthread_reg_offset[i] != -1 | |
256 | && (regnum == -1 || regnum == i)) | |
257 | { | |
258 | /* Fetch stack pointer from thread structure (if we didn't | |
259 | do so already). */ | |
260 | if (sp == 0) | |
e17a4113 | 261 | sp = read_memory_unsigned_integer (sp_addr, 4, byte_order); |
a28109e0 MK |
262 | |
263 | /* Read the saved register from the stack frame. */ | |
264 | read_memory (sp + i386obsd_uthread_reg_offset[i], buf, 4); | |
265 | regcache_raw_supply (regcache, i, buf); | |
266 | } | |
267 | } | |
a28109e0 MK |
268 | } |
269 | ||
270 | static void | |
271 | i386obsd_collect_uthread (const struct regcache *regcache, | |
272 | int regnum, CORE_ADDR addr) | |
273 | { | |
e17a4113 UW |
274 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
275 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
a28109e0 MK |
276 | CORE_ADDR sp_addr = addr + I386OBSD_UTHREAD_ESP_OFFSET; |
277 | CORE_ADDR sp = 0; | |
63c0089f | 278 | gdb_byte buf[4]; |
a28109e0 MK |
279 | int i; |
280 | ||
281 | gdb_assert (regnum >= -1); | |
282 | ||
283 | if (regnum == -1 || regnum == I386_ESP_REGNUM) | |
284 | { | |
285 | int offset; | |
286 | ||
287 | /* Calculate the stack pointer (frame pointer) that will be | |
288 | stored into the thread structure. */ | |
289 | offset = i386obsd_uthread_reg_offset[I386_EIP_REGNUM] + 4; | |
290 | regcache_raw_collect (regcache, I386_ESP_REGNUM, buf); | |
e17a4113 | 291 | sp = extract_unsigned_integer (buf, 4, byte_order) - offset; |
a28109e0 MK |
292 | |
293 | /* Store the stack pointer. */ | |
e17a4113 | 294 | write_memory_unsigned_integer (sp_addr, 4, byte_order, sp); |
a28109e0 MK |
295 | |
296 | /* The stack pointer was (potentially) modified. Make sure we | |
297 | build a proper stack frame. */ | |
298 | regnum = -1; | |
299 | } | |
300 | ||
301 | for (i = 0; i < ARRAY_SIZE (i386obsd_uthread_reg_offset); i++) | |
302 | { | |
303 | if (i386obsd_uthread_reg_offset[i] != -1 | |
304 | && (regnum == -1 || regnum == i)) | |
305 | { | |
306 | /* Fetch stack pointer from thread structure (if we didn't | |
307 | calculate it already). */ | |
308 | if (sp == 0) | |
e17a4113 | 309 | sp = read_memory_unsigned_integer (sp_addr, 4, byte_order); |
a28109e0 MK |
310 | |
311 | /* Write the register into the stack frame. */ | |
312 | regcache_raw_collect (regcache, i, buf); | |
313 | write_memory (sp + i386obsd_uthread_reg_offset[i], buf, 4); | |
314 | } | |
315 | } | |
316 | } | |
508fbfea MK |
317 | \f |
318 | /* Kernel debugging support. */ | |
319 | ||
320 | /* From <machine/frame.h>. Note that %esp and %ess are only saved in | |
321 | a trap frame when entering the kernel from user space. */ | |
322 | static int i386obsd_tf_reg_offset[] = | |
323 | { | |
324 | 10 * 4, /* %eax */ | |
325 | 9 * 4, /* %ecx */ | |
326 | 8 * 4, /* %edx */ | |
327 | 7 * 4, /* %ebx */ | |
328 | -1, /* %esp */ | |
329 | 6 * 4, /* %ebp */ | |
330 | 5 * 4, /* %esi */ | |
331 | 4 * 4, /* %edi */ | |
332 | 13 * 4, /* %eip */ | |
333 | 15 * 4, /* %eflags */ | |
334 | 14 * 4, /* %cs */ | |
335 | -1, /* %ss */ | |
336 | 3 * 4, /* %ds */ | |
337 | 2 * 4, /* %es */ | |
338 | 0 * 4, /* %fs */ | |
339 | 1 * 4 /* %gs */ | |
340 | }; | |
341 | ||
342 | static struct trad_frame_cache * | |
10458914 | 343 | i386obsd_trapframe_cache (struct frame_info *this_frame, void **this_cache) |
508fbfea | 344 | { |
e17a4113 UW |
345 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
346 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
508fbfea MK |
347 | struct trad_frame_cache *cache; |
348 | CORE_ADDR func, sp, addr; | |
349 | ULONGEST cs; | |
2c02bd72 | 350 | const char *name; |
508fbfea MK |
351 | int i; |
352 | ||
353 | if (*this_cache) | |
354 | return *this_cache; | |
355 | ||
10458914 | 356 | cache = trad_frame_cache_zalloc (this_frame); |
508fbfea MK |
357 | *this_cache = cache; |
358 | ||
10458914 DJ |
359 | func = get_frame_func (this_frame); |
360 | sp = get_frame_register_unsigned (this_frame, I386_ESP_REGNUM); | |
7238f002 MK |
361 | |
362 | find_pc_partial_function (func, &name, NULL, NULL); | |
6d566cff | 363 | if (name && strncmp (name, "Xintr", 5) == 0) |
7238f002 MK |
364 | addr = sp + 8; /* It's an interrupt frame. */ |
365 | else | |
366 | addr = sp; | |
367 | ||
508fbfea MK |
368 | for (i = 0; i < ARRAY_SIZE (i386obsd_tf_reg_offset); i++) |
369 | if (i386obsd_tf_reg_offset[i] != -1) | |
7238f002 | 370 | trad_frame_set_reg_addr (cache, i, addr + i386obsd_tf_reg_offset[i]); |
508fbfea MK |
371 | |
372 | /* Read %cs from trap frame. */ | |
7238f002 | 373 | addr += i386obsd_tf_reg_offset[I386_CS_REGNUM]; |
e17a4113 | 374 | cs = read_memory_unsigned_integer (addr, 4, byte_order); |
508fbfea MK |
375 | if ((cs & I386_SEL_RPL) == I386_SEL_UPL) |
376 | { | |
6d566cff | 377 | /* Trap from user space; terminate backtrace. */ |
005ca36a | 378 | trad_frame_set_id (cache, outer_frame_id); |
508fbfea MK |
379 | } |
380 | else | |
381 | { | |
382 | /* Construct the frame ID using the function start. */ | |
383 | trad_frame_set_id (cache, frame_id_build (sp + 8, func)); | |
384 | } | |
385 | ||
386 | return cache; | |
387 | } | |
388 | ||
389 | static void | |
10458914 | 390 | i386obsd_trapframe_this_id (struct frame_info *this_frame, |
508fbfea MK |
391 | void **this_cache, struct frame_id *this_id) |
392 | { | |
393 | struct trad_frame_cache *cache = | |
10458914 | 394 | i386obsd_trapframe_cache (this_frame, this_cache); |
508fbfea MK |
395 | |
396 | trad_frame_get_id (cache, this_id); | |
397 | } | |
398 | ||
10458914 DJ |
399 | static struct value * |
400 | i386obsd_trapframe_prev_register (struct frame_info *this_frame, | |
401 | void **this_cache, int regnum) | |
508fbfea MK |
402 | { |
403 | struct trad_frame_cache *cache = | |
10458914 | 404 | i386obsd_trapframe_cache (this_frame, this_cache); |
508fbfea | 405 | |
10458914 | 406 | return trad_frame_get_register (cache, this_frame, regnum); |
508fbfea MK |
407 | } |
408 | ||
7238f002 MK |
409 | static int |
410 | i386obsd_trapframe_sniffer (const struct frame_unwind *self, | |
10458914 | 411 | struct frame_info *this_frame, |
7238f002 | 412 | void **this_prologue_cache) |
508fbfea MK |
413 | { |
414 | ULONGEST cs; | |
2c02bd72 | 415 | const char *name; |
508fbfea | 416 | |
e5cc6d11 | 417 | /* Check Current Privilege Level and bail out if we're not executing |
6d566cff | 418 | in kernel space. */ |
10458914 | 419 | cs = get_frame_register_unsigned (this_frame, I386_CS_REGNUM); |
508fbfea | 420 | if ((cs & I386_SEL_RPL) == I386_SEL_UPL) |
6d566cff | 421 | return 0; |
508fbfea | 422 | |
10458914 | 423 | find_pc_partial_function (get_frame_pc (this_frame), &name, NULL, NULL); |
3597fb82 MK |
424 | return (name && (strcmp (name, "calltrap") == 0 |
425 | || strcmp (name, "syscall1") == 0 | |
426 | || strncmp (name, "Xintr", 5) == 0 | |
427 | || strncmp (name, "Xsoft", 5) == 0)); | |
508fbfea | 428 | } |
7238f002 MK |
429 | |
430 | static const struct frame_unwind i386obsd_trapframe_unwind = { | |
431 | /* FIXME: kettenis/20051219: This really is more like an interrupt | |
432 | frame, but SIGTRAMP_FRAME would print <signal handler called>, | |
433 | which really is not what we want here. */ | |
434 | NORMAL_FRAME, | |
8fbca658 | 435 | default_frame_unwind_stop_reason, |
7238f002 MK |
436 | i386obsd_trapframe_this_id, |
437 | i386obsd_trapframe_prev_register, | |
438 | NULL, | |
439 | i386obsd_trapframe_sniffer | |
440 | }; | |
508fbfea | 441 | \f |
a28109e0 | 442 | |
005328e3 MK |
443 | static void |
444 | i386obsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) | |
445 | { | |
446 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
447 | ||
448 | /* Obviously OpenBSD is BSD-based. */ | |
449 | i386bsd_init_abi (info, gdbarch); | |
450 | ||
67457012 MK |
451 | /* OpenBSD has a different `struct reg'. */ |
452 | tdep->gregset_reg_offset = i386obsd_r_reg_offset; | |
453 | tdep->gregset_num_regs = ARRAY_SIZE (i386obsd_r_reg_offset); | |
454 | tdep->sizeof_gregset = 16 * 4; | |
455 | ||
005328e3 MK |
456 | /* OpenBSD uses -freg-struct-return by default. */ |
457 | tdep->struct_return = reg_struct_return; | |
458 | ||
459 | /* OpenBSD uses a different memory layout. */ | |
5d93ae8c MK |
460 | tdep->sigtramp_start = i386obsd_sigtramp_start_addr; |
461 | tdep->sigtramp_end = i386obsd_sigtramp_end_addr; | |
911bc6ee | 462 | tdep->sigtramp_p = i386obsd_sigtramp_p; |
005328e3 MK |
463 | |
464 | /* OpenBSD has a `struct sigcontext' that's different from the | |
f2e7c15d | 465 | original 4.3 BSD. */ |
a3386186 | 466 | tdep->sc_reg_offset = i386obsd_sc_reg_offset; |
67457012 | 467 | tdep->sc_num_regs = ARRAY_SIZE (i386obsd_sc_reg_offset); |
a28109e0 MK |
468 | |
469 | /* OpenBSD provides a user-level threads implementation. */ | |
470 | bsd_uthread_set_supply_uthread (gdbarch, i386obsd_supply_uthread); | |
471 | bsd_uthread_set_collect_uthread (gdbarch, i386obsd_collect_uthread); | |
508fbfea MK |
472 | |
473 | /* Unwind kernel trap frames correctly. */ | |
7238f002 | 474 | frame_unwind_prepend_unwinder (gdbarch, &i386obsd_trapframe_unwind); |
005328e3 | 475 | } |
60a6eeb6 MK |
476 | |
477 | /* OpenBSD a.out. */ | |
478 | ||
479 | static void | |
480 | i386obsd_aout_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) | |
481 | { | |
482 | i386obsd_init_abi (info, gdbarch); | |
483 | ||
484 | /* OpenBSD a.out has a single register set. */ | |
485 | set_gdbarch_regset_from_core_section | |
486 | (gdbarch, i386obsd_aout_regset_from_core_section); | |
487 | } | |
488 | ||
489 | /* OpenBSD ELF. */ | |
490 | ||
491 | static void | |
492 | i386obsd_elf_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) | |
493 | { | |
494 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
495 | ||
496 | /* It's still OpenBSD. */ | |
497 | i386obsd_init_abi (info, gdbarch); | |
498 | ||
499 | /* But ELF-based. */ | |
500 | i386_elf_init_abi (info, gdbarch); | |
501 | ||
502 | /* OpenBSD ELF uses SVR4-style shared libraries. */ | |
60a6eeb6 MK |
503 | set_solib_svr4_fetch_link_map_offsets |
504 | (gdbarch, svr4_ilp32_fetch_link_map_offsets); | |
505 | } | |
67457012 MK |
506 | \f |
507 | ||
508 | /* Provide a prototype to silence -Wmissing-prototypes. */ | |
509 | void _initialize_i386obsd_tdep (void); | |
005328e3 MK |
510 | |
511 | void | |
512 | _initialize_i386obsd_tdep (void) | |
513 | { | |
005328e3 MK |
514 | /* FIXME: kettenis/20021020: Since OpenBSD/i386 binaries are |
515 | indistingushable from NetBSD/i386 a.out binaries, building a GDB | |
516 | that should support both these targets will probably not work as | |
517 | expected. */ | |
518 | #define GDB_OSABI_OPENBSD_AOUT GDB_OSABI_NETBSD_AOUT | |
519 | ||
05816f70 | 520 | gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_OPENBSD_AOUT, |
60a6eeb6 MK |
521 | i386obsd_aout_init_abi); |
522 | gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_OPENBSD_ELF, | |
523 | i386obsd_elf_init_abi); | |
005328e3 | 524 | } |