Commit | Line | Data |
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005328e3 | 1 | /* Target-dependent code for OpenBSD/i386. |
67457012 | 2 | |
ecd75fc8 | 3 | Copyright (C) 1988-2014 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 | |
93ffa5b9 | 33 | #include "obsd-tdep.h" |
005328e3 MK |
34 | #include "i386-tdep.h" |
35 | #include "i387-tdep.h" | |
60a6eeb6 | 36 | #include "solib-svr4.h" |
a28109e0 | 37 | #include "bsd-uthread.h" |
005328e3 | 38 | |
5d93ae8c MK |
39 | /* Support for signal handlers. */ |
40 | ||
41 | /* Since OpenBSD 3.2, the sigtramp routine is mapped at a random page | |
42 | in virtual memory. The randomness makes it somewhat tricky to | |
43 | detect it, but fortunately we can rely on the fact that the start | |
3ed85247 MK |
44 | of the sigtramp routine is page-aligned. We recognize the |
45 | trampoline by looking for the code that invokes the sigreturn | |
46 | system call. The offset where we can find that code varies from | |
47 | release to release. | |
48 | ||
49 | By the way, the mapping mentioned above is read-only, so you cannot | |
50 | place a breakpoint in the signal trampoline. */ | |
5d93ae8c MK |
51 | |
52 | /* Default page size. */ | |
53 | static const int i386obsd_page_size = 4096; | |
54 | ||
3ed85247 MK |
55 | /* Offset for sigreturn(2). */ |
56 | static const int i386obsd_sigreturn_offset[] = { | |
57 | 0x0a, /* OpenBSD 3.2 */ | |
58 | 0x14, /* OpenBSD 3.6 */ | |
59 | 0x3a, /* OpenBSD 3.8 */ | |
60 | -1 | |
61 | }; | |
62 | ||
10458914 DJ |
63 | /* Return whether THIS_FRAME corresponds to an OpenBSD sigtramp |
64 | routine. */ | |
5d93ae8c MK |
65 | |
66 | static int | |
10458914 | 67 | i386obsd_sigtramp_p (struct frame_info *this_frame) |
5d93ae8c | 68 | { |
10458914 | 69 | CORE_ADDR pc = get_frame_pc (this_frame); |
5d93ae8c | 70 | CORE_ADDR start_pc = (pc & ~(i386obsd_page_size - 1)); |
3ed85247 | 71 | /* The call sequence invoking sigreturn(2). */ |
63c0089f | 72 | const gdb_byte sigreturn[] = |
5d93ae8c MK |
73 | { |
74 | 0xb8, | |
75 | 0x67, 0x00, 0x00, 0x00, /* movl $SYS_sigreturn, %eax */ | |
76 | 0xcd, 0x80 /* int $0x80 */ | |
77 | }; | |
c822af0c | 78 | size_t buflen = sizeof sigreturn; |
3ed85247 | 79 | const int *offset; |
63c0089f | 80 | gdb_byte *buf; |
2c02bd72 | 81 | const char *name; |
5d93ae8c | 82 | |
911bc6ee MK |
83 | /* If the function has a valid symbol name, it isn't a |
84 | trampoline. */ | |
85 | find_pc_partial_function (pc, &name, NULL, NULL); | |
86 | if (name != NULL) | |
87 | return 0; | |
88 | ||
89 | /* If the function lives in a valid section (even without a starting | |
90 | point) it isn't a trampoline. */ | |
91 | if (find_pc_section (pc) != NULL) | |
5d93ae8c MK |
92 | return 0; |
93 | ||
9c8e3411 | 94 | /* Allocate buffer. */ |
c822af0c | 95 | buf = alloca (buflen); |
9c8e3411 | 96 | |
3ed85247 MK |
97 | /* Loop over all offsets. */ |
98 | for (offset = i386obsd_sigreturn_offset; *offset != -1; offset++) | |
99 | { | |
100 | /* If we can't read the instructions, return zero. */ | |
10458914 | 101 | if (!safe_frame_unwind_memory (this_frame, start_pc + *offset, |
3ed85247 MK |
102 | buf, buflen)) |
103 | return 0; | |
104 | ||
105 | /* Check for sigreturn(2). */ | |
106 | if (memcmp (buf, sigreturn, buflen) == 0) | |
107 | return 1; | |
108 | } | |
9c8e3411 | 109 | |
911bc6ee | 110 | return 0; |
5d93ae8c MK |
111 | } |
112 | \f | |
113 | /* Mapping between the general-purpose registers in `struct reg' | |
114 | format and GDB's register cache layout. */ | |
115 | ||
67457012 MK |
116 | /* From <machine/reg.h>. */ |
117 | static int i386obsd_r_reg_offset[] = | |
118 | { | |
119 | 0 * 4, /* %eax */ | |
120 | 1 * 4, /* %ecx */ | |
121 | 2 * 4, /* %edx */ | |
122 | 3 * 4, /* %ebx */ | |
123 | 4 * 4, /* %esp */ | |
124 | 5 * 4, /* %ebp */ | |
125 | 6 * 4, /* %esi */ | |
126 | 7 * 4, /* %edi */ | |
127 | 8 * 4, /* %eip */ | |
128 | 9 * 4, /* %eflags */ | |
129 | 10 * 4, /* %cs */ | |
130 | 11 * 4, /* %ss */ | |
131 | 12 * 4, /* %ds */ | |
132 | 13 * 4, /* %es */ | |
133 | 14 * 4, /* %fs */ | |
134 | 15 * 4 /* %gs */ | |
135 | }; | |
005328e3 MK |
136 | |
137 | static void | |
67457012 MK |
138 | i386obsd_aout_supply_regset (const struct regset *regset, |
139 | struct regcache *regcache, int regnum, | |
140 | const void *regs, size_t len) | |
005328e3 | 141 | { |
09424cff AA |
142 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
143 | const struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
3ed85247 | 144 | const gdb_byte *gregs = regs; |
67457012 MK |
145 | |
146 | gdb_assert (len >= tdep->sizeof_gregset + I387_SIZEOF_FSAVE); | |
005328e3 | 147 | |
67457012 | 148 | i386_supply_gregset (regset, regcache, regnum, regs, tdep->sizeof_gregset); |
3ed85247 | 149 | i387_supply_fsave (regcache, regnum, gregs + tdep->sizeof_gregset); |
005328e3 MK |
150 | } |
151 | ||
ecc37a5a AA |
152 | static const struct regset i386obsd_aout_gregset = |
153 | { | |
154 | NULL, i386obsd_aout_supply_regset, NULL | |
155 | }; | |
156 | ||
49cfa46f | 157 | static const struct regset * |
67457012 MK |
158 | i386obsd_aout_regset_from_core_section (struct gdbarch *gdbarch, |
159 | const char *sect_name, | |
160 | size_t sect_size) | |
005328e3 | 161 | { |
67457012 | 162 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
005328e3 | 163 | |
67457012 MK |
164 | /* OpenBSD a.out core dumps don't use seperate register sets for the |
165 | general-purpose and floating-point registers. */ | |
005328e3 | 166 | |
67457012 MK |
167 | if (strcmp (sect_name, ".reg") == 0 |
168 | && sect_size >= tdep->sizeof_gregset + I387_SIZEOF_FSAVE) | |
ecc37a5a | 169 | return &i386obsd_aout_gregset; |
005328e3 | 170 | |
67457012 | 171 | return NULL; |
005328e3 | 172 | } |
005328e3 MK |
173 | \f |
174 | ||
5d93ae8c MK |
175 | /* Sigtramp routine location for OpenBSD 3.1 and earlier releases. */ |
176 | CORE_ADDR i386obsd_sigtramp_start_addr = 0xbfbfdf20; | |
177 | CORE_ADDR i386obsd_sigtramp_end_addr = 0xbfbfdff0; | |
005328e3 MK |
178 | |
179 | /* From <machine/signal.h>. */ | |
a3386186 MK |
180 | int i386obsd_sc_reg_offset[I386_NUM_GREGS] = |
181 | { | |
182 | 10 * 4, /* %eax */ | |
183 | 9 * 4, /* %ecx */ | |
184 | 8 * 4, /* %edx */ | |
185 | 7 * 4, /* %ebx */ | |
186 | 14 * 4, /* %esp */ | |
187 | 6 * 4, /* %ebp */ | |
188 | 5 * 4, /* %esi */ | |
189 | 4 * 4, /* %edi */ | |
190 | 11 * 4, /* %eip */ | |
191 | 13 * 4, /* %eflags */ | |
192 | 12 * 4, /* %cs */ | |
193 | 15 * 4, /* %ss */ | |
194 | 3 * 4, /* %ds */ | |
195 | 2 * 4, /* %es */ | |
196 | 1 * 4, /* %fs */ | |
197 | 0 * 4 /* %gs */ | |
198 | }; | |
005328e3 | 199 | |
a28109e0 MK |
200 | /* From /usr/src/lib/libpthread/arch/i386/uthread_machdep.c. */ |
201 | static int i386obsd_uthread_reg_offset[] = | |
202 | { | |
203 | 11 * 4, /* %eax */ | |
204 | 10 * 4, /* %ecx */ | |
205 | 9 * 4, /* %edx */ | |
206 | 8 * 4, /* %ebx */ | |
207 | -1, /* %esp */ | |
208 | 6 * 4, /* %ebp */ | |
209 | 5 * 4, /* %esi */ | |
210 | 4 * 4, /* %edi */ | |
211 | 12 * 4, /* %eip */ | |
212 | -1, /* %eflags */ | |
213 | 13 * 4, /* %cs */ | |
214 | -1, /* %ss */ | |
215 | 3 * 4, /* %ds */ | |
216 | 2 * 4, /* %es */ | |
217 | 1 * 4, /* %fs */ | |
218 | 0 * 4 /* %gs */ | |
219 | }; | |
220 | ||
221 | /* Offset within the thread structure where we can find the saved | |
222 | stack pointer (%esp). */ | |
223 | #define I386OBSD_UTHREAD_ESP_OFFSET 176 | |
224 | ||
225 | static void | |
226 | i386obsd_supply_uthread (struct regcache *regcache, | |
227 | int regnum, CORE_ADDR addr) | |
228 | { | |
e17a4113 UW |
229 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
230 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
a28109e0 MK |
231 | CORE_ADDR sp_addr = addr + I386OBSD_UTHREAD_ESP_OFFSET; |
232 | CORE_ADDR sp = 0; | |
63c0089f | 233 | gdb_byte buf[4]; |
a28109e0 MK |
234 | int i; |
235 | ||
236 | gdb_assert (regnum >= -1); | |
237 | ||
238 | if (regnum == -1 || regnum == I386_ESP_REGNUM) | |
239 | { | |
240 | int offset; | |
241 | ||
242 | /* Fetch stack pointer from thread structure. */ | |
e17a4113 | 243 | sp = read_memory_unsigned_integer (sp_addr, 4, byte_order); |
a28109e0 MK |
244 | |
245 | /* Adjust the stack pointer such that it looks as if we just | |
246 | returned from _thread_machdep_switch. */ | |
247 | offset = i386obsd_uthread_reg_offset[I386_EIP_REGNUM] + 4; | |
e17a4113 | 248 | store_unsigned_integer (buf, 4, byte_order, sp + offset); |
a28109e0 MK |
249 | regcache_raw_supply (regcache, I386_ESP_REGNUM, buf); |
250 | } | |
251 | ||
252 | for (i = 0; i < ARRAY_SIZE (i386obsd_uthread_reg_offset); i++) | |
253 | { | |
254 | if (i386obsd_uthread_reg_offset[i] != -1 | |
255 | && (regnum == -1 || regnum == i)) | |
256 | { | |
257 | /* Fetch stack pointer from thread structure (if we didn't | |
258 | do so already). */ | |
259 | if (sp == 0) | |
e17a4113 | 260 | sp = read_memory_unsigned_integer (sp_addr, 4, byte_order); |
a28109e0 MK |
261 | |
262 | /* Read the saved register from the stack frame. */ | |
263 | read_memory (sp + i386obsd_uthread_reg_offset[i], buf, 4); | |
264 | regcache_raw_supply (regcache, i, buf); | |
265 | } | |
266 | } | |
a28109e0 MK |
267 | } |
268 | ||
269 | static void | |
270 | i386obsd_collect_uthread (const struct regcache *regcache, | |
271 | int regnum, CORE_ADDR addr) | |
272 | { | |
e17a4113 UW |
273 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
274 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
a28109e0 MK |
275 | CORE_ADDR sp_addr = addr + I386OBSD_UTHREAD_ESP_OFFSET; |
276 | CORE_ADDR sp = 0; | |
63c0089f | 277 | gdb_byte buf[4]; |
a28109e0 MK |
278 | int i; |
279 | ||
280 | gdb_assert (regnum >= -1); | |
281 | ||
282 | if (regnum == -1 || regnum == I386_ESP_REGNUM) | |
283 | { | |
284 | int offset; | |
285 | ||
286 | /* Calculate the stack pointer (frame pointer) that will be | |
287 | stored into the thread structure. */ | |
288 | offset = i386obsd_uthread_reg_offset[I386_EIP_REGNUM] + 4; | |
289 | regcache_raw_collect (regcache, I386_ESP_REGNUM, buf); | |
e17a4113 | 290 | sp = extract_unsigned_integer (buf, 4, byte_order) - offset; |
a28109e0 MK |
291 | |
292 | /* Store the stack pointer. */ | |
e17a4113 | 293 | write_memory_unsigned_integer (sp_addr, 4, byte_order, sp); |
a28109e0 MK |
294 | |
295 | /* The stack pointer was (potentially) modified. Make sure we | |
296 | build a proper stack frame. */ | |
297 | regnum = -1; | |
298 | } | |
299 | ||
300 | for (i = 0; i < ARRAY_SIZE (i386obsd_uthread_reg_offset); i++) | |
301 | { | |
302 | if (i386obsd_uthread_reg_offset[i] != -1 | |
303 | && (regnum == -1 || regnum == i)) | |
304 | { | |
305 | /* Fetch stack pointer from thread structure (if we didn't | |
306 | calculate it already). */ | |
307 | if (sp == 0) | |
e17a4113 | 308 | sp = read_memory_unsigned_integer (sp_addr, 4, byte_order); |
a28109e0 MK |
309 | |
310 | /* Write the register into the stack frame. */ | |
311 | regcache_raw_collect (regcache, i, buf); | |
312 | write_memory (sp + i386obsd_uthread_reg_offset[i], buf, 4); | |
313 | } | |
314 | } | |
315 | } | |
508fbfea MK |
316 | \f |
317 | /* Kernel debugging support. */ | |
318 | ||
319 | /* From <machine/frame.h>. Note that %esp and %ess are only saved in | |
320 | a trap frame when entering the kernel from user space. */ | |
321 | static int i386obsd_tf_reg_offset[] = | |
322 | { | |
323 | 10 * 4, /* %eax */ | |
324 | 9 * 4, /* %ecx */ | |
325 | 8 * 4, /* %edx */ | |
326 | 7 * 4, /* %ebx */ | |
327 | -1, /* %esp */ | |
328 | 6 * 4, /* %ebp */ | |
329 | 5 * 4, /* %esi */ | |
330 | 4 * 4, /* %edi */ | |
331 | 13 * 4, /* %eip */ | |
332 | 15 * 4, /* %eflags */ | |
333 | 14 * 4, /* %cs */ | |
334 | -1, /* %ss */ | |
335 | 3 * 4, /* %ds */ | |
336 | 2 * 4, /* %es */ | |
337 | 0 * 4, /* %fs */ | |
338 | 1 * 4 /* %gs */ | |
339 | }; | |
340 | ||
341 | static struct trad_frame_cache * | |
10458914 | 342 | i386obsd_trapframe_cache (struct frame_info *this_frame, void **this_cache) |
508fbfea | 343 | { |
e17a4113 UW |
344 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
345 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
508fbfea MK |
346 | struct trad_frame_cache *cache; |
347 | CORE_ADDR func, sp, addr; | |
348 | ULONGEST cs; | |
2c02bd72 | 349 | const char *name; |
508fbfea MK |
350 | int i; |
351 | ||
352 | if (*this_cache) | |
353 | return *this_cache; | |
354 | ||
10458914 | 355 | cache = trad_frame_cache_zalloc (this_frame); |
508fbfea MK |
356 | *this_cache = cache; |
357 | ||
10458914 DJ |
358 | func = get_frame_func (this_frame); |
359 | sp = get_frame_register_unsigned (this_frame, I386_ESP_REGNUM); | |
7238f002 MK |
360 | |
361 | find_pc_partial_function (func, &name, NULL, NULL); | |
6d566cff | 362 | if (name && strncmp (name, "Xintr", 5) == 0) |
7238f002 MK |
363 | addr = sp + 8; /* It's an interrupt frame. */ |
364 | else | |
365 | addr = sp; | |
366 | ||
508fbfea MK |
367 | for (i = 0; i < ARRAY_SIZE (i386obsd_tf_reg_offset); i++) |
368 | if (i386obsd_tf_reg_offset[i] != -1) | |
7238f002 | 369 | trad_frame_set_reg_addr (cache, i, addr + i386obsd_tf_reg_offset[i]); |
508fbfea MK |
370 | |
371 | /* Read %cs from trap frame. */ | |
7238f002 | 372 | addr += i386obsd_tf_reg_offset[I386_CS_REGNUM]; |
e17a4113 | 373 | cs = read_memory_unsigned_integer (addr, 4, byte_order); |
508fbfea MK |
374 | if ((cs & I386_SEL_RPL) == I386_SEL_UPL) |
375 | { | |
6d566cff | 376 | /* Trap from user space; terminate backtrace. */ |
005ca36a | 377 | trad_frame_set_id (cache, outer_frame_id); |
508fbfea MK |
378 | } |
379 | else | |
380 | { | |
381 | /* Construct the frame ID using the function start. */ | |
382 | trad_frame_set_id (cache, frame_id_build (sp + 8, func)); | |
383 | } | |
384 | ||
385 | return cache; | |
386 | } | |
387 | ||
388 | static void | |
10458914 | 389 | i386obsd_trapframe_this_id (struct frame_info *this_frame, |
508fbfea MK |
390 | void **this_cache, struct frame_id *this_id) |
391 | { | |
392 | struct trad_frame_cache *cache = | |
10458914 | 393 | i386obsd_trapframe_cache (this_frame, this_cache); |
508fbfea MK |
394 | |
395 | trad_frame_get_id (cache, this_id); | |
396 | } | |
397 | ||
10458914 DJ |
398 | static struct value * |
399 | i386obsd_trapframe_prev_register (struct frame_info *this_frame, | |
400 | void **this_cache, int regnum) | |
508fbfea MK |
401 | { |
402 | struct trad_frame_cache *cache = | |
10458914 | 403 | i386obsd_trapframe_cache (this_frame, this_cache); |
508fbfea | 404 | |
10458914 | 405 | return trad_frame_get_register (cache, this_frame, regnum); |
508fbfea MK |
406 | } |
407 | ||
7238f002 MK |
408 | static int |
409 | i386obsd_trapframe_sniffer (const struct frame_unwind *self, | |
10458914 | 410 | struct frame_info *this_frame, |
7238f002 | 411 | void **this_prologue_cache) |
508fbfea MK |
412 | { |
413 | ULONGEST cs; | |
2c02bd72 | 414 | const char *name; |
508fbfea | 415 | |
e5cc6d11 | 416 | /* Check Current Privilege Level and bail out if we're not executing |
6d566cff | 417 | in kernel space. */ |
10458914 | 418 | cs = get_frame_register_unsigned (this_frame, I386_CS_REGNUM); |
508fbfea | 419 | if ((cs & I386_SEL_RPL) == I386_SEL_UPL) |
6d566cff | 420 | return 0; |
508fbfea | 421 | |
10458914 | 422 | find_pc_partial_function (get_frame_pc (this_frame), &name, NULL, NULL); |
3597fb82 MK |
423 | return (name && (strcmp (name, "calltrap") == 0 |
424 | || strcmp (name, "syscall1") == 0 | |
425 | || strncmp (name, "Xintr", 5) == 0 | |
426 | || strncmp (name, "Xsoft", 5) == 0)); | |
508fbfea | 427 | } |
7238f002 MK |
428 | |
429 | static const struct frame_unwind i386obsd_trapframe_unwind = { | |
430 | /* FIXME: kettenis/20051219: This really is more like an interrupt | |
431 | frame, but SIGTRAMP_FRAME would print <signal handler called>, | |
432 | which really is not what we want here. */ | |
433 | NORMAL_FRAME, | |
8fbca658 | 434 | default_frame_unwind_stop_reason, |
7238f002 MK |
435 | i386obsd_trapframe_this_id, |
436 | i386obsd_trapframe_prev_register, | |
437 | NULL, | |
438 | i386obsd_trapframe_sniffer | |
439 | }; | |
508fbfea | 440 | \f |
a28109e0 | 441 | |
005328e3 MK |
442 | static void |
443 | i386obsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) | |
444 | { | |
445 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
446 | ||
447 | /* Obviously OpenBSD is BSD-based. */ | |
448 | i386bsd_init_abi (info, gdbarch); | |
93ffa5b9 | 449 | obsd_init_abi (info, gdbarch); |
005328e3 | 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 | } |