Commit | Line | Data |
---|---|---|
005328e3 | 1 | /* Target-dependent code for OpenBSD/i386. |
67457012 | 2 | |
6aba47ca | 3 | Copyright (C) 1988, 1989, 1991, 1992, 1994, 1996, 2000, 2001, 2002, 2003, |
7b6bb8da JB |
4 | 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 |
5 | Free Software Foundation, Inc. | |
005328e3 MK |
6 | |
7 | This file is part of GDB. | |
8 | ||
9 | This program is free software; you can redistribute it and/or modify | |
10 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 11 | the Free Software Foundation; either version 3 of the License, or |
005328e3 MK |
12 | (at your option) any later version. |
13 | ||
14 | This program is distributed in the hope that it will be useful, | |
15 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | GNU General Public License for more details. | |
18 | ||
19 | You should have received a copy of the GNU General Public License | |
a9762ec7 | 20 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
005328e3 MK |
21 | |
22 | #include "defs.h" | |
23 | #include "arch-utils.h" | |
911bc6ee | 24 | #include "frame.h" |
508fbfea | 25 | #include "frame-unwind.h" |
005328e3 MK |
26 | #include "gdbcore.h" |
27 | #include "regcache.h" | |
67457012 | 28 | #include "regset.h" |
911bc6ee MK |
29 | #include "symtab.h" |
30 | #include "objfiles.h" | |
4be87837 | 31 | #include "osabi.h" |
5d93ae8c | 32 | #include "target.h" |
508fbfea | 33 | #include "trad-frame.h" |
005328e3 | 34 | |
67457012 MK |
35 | #include "gdb_assert.h" |
36 | #include "gdb_string.h" | |
37 | ||
005328e3 MK |
38 | #include "i386-tdep.h" |
39 | #include "i387-tdep.h" | |
60a6eeb6 | 40 | #include "solib-svr4.h" |
a28109e0 | 41 | #include "bsd-uthread.h" |
005328e3 | 42 | |
5d93ae8c MK |
43 | /* Support for signal handlers. */ |
44 | ||
45 | /* Since OpenBSD 3.2, the sigtramp routine is mapped at a random page | |
46 | in virtual memory. The randomness makes it somewhat tricky to | |
47 | detect it, but fortunately we can rely on the fact that the start | |
3ed85247 MK |
48 | of the sigtramp routine is page-aligned. We recognize the |
49 | trampoline by looking for the code that invokes the sigreturn | |
50 | system call. The offset where we can find that code varies from | |
51 | release to release. | |
52 | ||
53 | By the way, the mapping mentioned above is read-only, so you cannot | |
54 | place a breakpoint in the signal trampoline. */ | |
5d93ae8c MK |
55 | |
56 | /* Default page size. */ | |
57 | static const int i386obsd_page_size = 4096; | |
58 | ||
3ed85247 MK |
59 | /* Offset for sigreturn(2). */ |
60 | static const int i386obsd_sigreturn_offset[] = { | |
61 | 0x0a, /* OpenBSD 3.2 */ | |
62 | 0x14, /* OpenBSD 3.6 */ | |
63 | 0x3a, /* OpenBSD 3.8 */ | |
64 | -1 | |
65 | }; | |
66 | ||
10458914 DJ |
67 | /* Return whether THIS_FRAME corresponds to an OpenBSD sigtramp |
68 | routine. */ | |
5d93ae8c MK |
69 | |
70 | static int | |
10458914 | 71 | i386obsd_sigtramp_p (struct frame_info *this_frame) |
5d93ae8c | 72 | { |
10458914 | 73 | CORE_ADDR pc = get_frame_pc (this_frame); |
5d93ae8c | 74 | CORE_ADDR start_pc = (pc & ~(i386obsd_page_size - 1)); |
3ed85247 | 75 | /* The call sequence invoking sigreturn(2). */ |
63c0089f | 76 | const gdb_byte sigreturn[] = |
5d93ae8c MK |
77 | { |
78 | 0xb8, | |
79 | 0x67, 0x00, 0x00, 0x00, /* movl $SYS_sigreturn, %eax */ | |
80 | 0xcd, 0x80 /* int $0x80 */ | |
81 | }; | |
c822af0c | 82 | size_t buflen = sizeof sigreturn; |
3ed85247 | 83 | const int *offset; |
63c0089f MK |
84 | gdb_byte *buf; |
85 | char *name; | |
5d93ae8c | 86 | |
911bc6ee MK |
87 | /* If the function has a valid symbol name, it isn't a |
88 | trampoline. */ | |
89 | find_pc_partial_function (pc, &name, NULL, NULL); | |
90 | if (name != NULL) | |
91 | return 0; | |
92 | ||
93 | /* If the function lives in a valid section (even without a starting | |
94 | point) it isn't a trampoline. */ | |
95 | if (find_pc_section (pc) != NULL) | |
5d93ae8c MK |
96 | return 0; |
97 | ||
9c8e3411 | 98 | /* Allocate buffer. */ |
c822af0c | 99 | buf = alloca (buflen); |
9c8e3411 | 100 | |
3ed85247 MK |
101 | /* Loop over all offsets. */ |
102 | for (offset = i386obsd_sigreturn_offset; *offset != -1; offset++) | |
103 | { | |
104 | /* If we can't read the instructions, return zero. */ | |
10458914 | 105 | if (!safe_frame_unwind_memory (this_frame, start_pc + *offset, |
3ed85247 MK |
106 | buf, buflen)) |
107 | return 0; | |
108 | ||
109 | /* Check for sigreturn(2). */ | |
110 | if (memcmp (buf, sigreturn, buflen) == 0) | |
111 | return 1; | |
112 | } | |
9c8e3411 | 113 | |
911bc6ee | 114 | return 0; |
5d93ae8c MK |
115 | } |
116 | \f | |
117 | /* Mapping between the general-purpose registers in `struct reg' | |
118 | format and GDB's register cache layout. */ | |
119 | ||
67457012 MK |
120 | /* From <machine/reg.h>. */ |
121 | static int i386obsd_r_reg_offset[] = | |
122 | { | |
123 | 0 * 4, /* %eax */ | |
124 | 1 * 4, /* %ecx */ | |
125 | 2 * 4, /* %edx */ | |
126 | 3 * 4, /* %ebx */ | |
127 | 4 * 4, /* %esp */ | |
128 | 5 * 4, /* %ebp */ | |
129 | 6 * 4, /* %esi */ | |
130 | 7 * 4, /* %edi */ | |
131 | 8 * 4, /* %eip */ | |
132 | 9 * 4, /* %eflags */ | |
133 | 10 * 4, /* %cs */ | |
134 | 11 * 4, /* %ss */ | |
135 | 12 * 4, /* %ds */ | |
136 | 13 * 4, /* %es */ | |
137 | 14 * 4, /* %fs */ | |
138 | 15 * 4 /* %gs */ | |
139 | }; | |
005328e3 MK |
140 | |
141 | static void | |
67457012 MK |
142 | i386obsd_aout_supply_regset (const struct regset *regset, |
143 | struct regcache *regcache, int regnum, | |
144 | const void *regs, size_t len) | |
005328e3 | 145 | { |
9ea75c57 | 146 | const struct gdbarch_tdep *tdep = gdbarch_tdep (regset->arch); |
3ed85247 | 147 | const gdb_byte *gregs = regs; |
67457012 MK |
148 | |
149 | gdb_assert (len >= tdep->sizeof_gregset + I387_SIZEOF_FSAVE); | |
005328e3 | 150 | |
67457012 | 151 | i386_supply_gregset (regset, regcache, regnum, regs, tdep->sizeof_gregset); |
3ed85247 | 152 | i387_supply_fsave (regcache, regnum, gregs + tdep->sizeof_gregset); |
005328e3 MK |
153 | } |
154 | ||
49cfa46f | 155 | static const struct regset * |
67457012 MK |
156 | i386obsd_aout_regset_from_core_section (struct gdbarch *gdbarch, |
157 | const char *sect_name, | |
158 | size_t sect_size) | |
005328e3 | 159 | { |
67457012 | 160 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
005328e3 | 161 | |
67457012 MK |
162 | /* OpenBSD a.out core dumps don't use seperate register sets for the |
163 | general-purpose and floating-point registers. */ | |
005328e3 | 164 | |
67457012 MK |
165 | if (strcmp (sect_name, ".reg") == 0 |
166 | && sect_size >= tdep->sizeof_gregset + I387_SIZEOF_FSAVE) | |
005328e3 | 167 | { |
67457012 | 168 | if (tdep->gregset == NULL) |
9ea75c57 MK |
169 | tdep->gregset = |
170 | regset_alloc (gdbarch, i386obsd_aout_supply_regset, NULL); | |
67457012 | 171 | return tdep->gregset; |
005328e3 MK |
172 | } |
173 | ||
67457012 | 174 | return NULL; |
005328e3 | 175 | } |
005328e3 MK |
176 | \f |
177 | ||
5d93ae8c MK |
178 | /* Sigtramp routine location for OpenBSD 3.1 and earlier releases. */ |
179 | CORE_ADDR i386obsd_sigtramp_start_addr = 0xbfbfdf20; | |
180 | CORE_ADDR i386obsd_sigtramp_end_addr = 0xbfbfdff0; | |
005328e3 MK |
181 | |
182 | /* From <machine/signal.h>. */ | |
a3386186 MK |
183 | int i386obsd_sc_reg_offset[I386_NUM_GREGS] = |
184 | { | |
185 | 10 * 4, /* %eax */ | |
186 | 9 * 4, /* %ecx */ | |
187 | 8 * 4, /* %edx */ | |
188 | 7 * 4, /* %ebx */ | |
189 | 14 * 4, /* %esp */ | |
190 | 6 * 4, /* %ebp */ | |
191 | 5 * 4, /* %esi */ | |
192 | 4 * 4, /* %edi */ | |
193 | 11 * 4, /* %eip */ | |
194 | 13 * 4, /* %eflags */ | |
195 | 12 * 4, /* %cs */ | |
196 | 15 * 4, /* %ss */ | |
197 | 3 * 4, /* %ds */ | |
198 | 2 * 4, /* %es */ | |
199 | 1 * 4, /* %fs */ | |
200 | 0 * 4 /* %gs */ | |
201 | }; | |
005328e3 | 202 | |
a28109e0 MK |
203 | /* From /usr/src/lib/libpthread/arch/i386/uthread_machdep.c. */ |
204 | static int i386obsd_uthread_reg_offset[] = | |
205 | { | |
206 | 11 * 4, /* %eax */ | |
207 | 10 * 4, /* %ecx */ | |
208 | 9 * 4, /* %edx */ | |
209 | 8 * 4, /* %ebx */ | |
210 | -1, /* %esp */ | |
211 | 6 * 4, /* %ebp */ | |
212 | 5 * 4, /* %esi */ | |
213 | 4 * 4, /* %edi */ | |
214 | 12 * 4, /* %eip */ | |
215 | -1, /* %eflags */ | |
216 | 13 * 4, /* %cs */ | |
217 | -1, /* %ss */ | |
218 | 3 * 4, /* %ds */ | |
219 | 2 * 4, /* %es */ | |
220 | 1 * 4, /* %fs */ | |
221 | 0 * 4 /* %gs */ | |
222 | }; | |
223 | ||
224 | /* Offset within the thread structure where we can find the saved | |
225 | stack pointer (%esp). */ | |
226 | #define I386OBSD_UTHREAD_ESP_OFFSET 176 | |
227 | ||
228 | static void | |
229 | i386obsd_supply_uthread (struct regcache *regcache, | |
230 | int regnum, CORE_ADDR addr) | |
231 | { | |
e17a4113 UW |
232 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
233 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
a28109e0 MK |
234 | CORE_ADDR sp_addr = addr + I386OBSD_UTHREAD_ESP_OFFSET; |
235 | CORE_ADDR sp = 0; | |
63c0089f | 236 | gdb_byte buf[4]; |
a28109e0 MK |
237 | int i; |
238 | ||
239 | gdb_assert (regnum >= -1); | |
240 | ||
241 | if (regnum == -1 || regnum == I386_ESP_REGNUM) | |
242 | { | |
243 | int offset; | |
244 | ||
245 | /* Fetch stack pointer from thread structure. */ | |
e17a4113 | 246 | sp = read_memory_unsigned_integer (sp_addr, 4, byte_order); |
a28109e0 MK |
247 | |
248 | /* Adjust the stack pointer such that it looks as if we just | |
249 | returned from _thread_machdep_switch. */ | |
250 | offset = i386obsd_uthread_reg_offset[I386_EIP_REGNUM] + 4; | |
e17a4113 | 251 | store_unsigned_integer (buf, 4, byte_order, sp + offset); |
a28109e0 MK |
252 | regcache_raw_supply (regcache, I386_ESP_REGNUM, buf); |
253 | } | |
254 | ||
255 | for (i = 0; i < ARRAY_SIZE (i386obsd_uthread_reg_offset); i++) | |
256 | { | |
257 | if (i386obsd_uthread_reg_offset[i] != -1 | |
258 | && (regnum == -1 || regnum == i)) | |
259 | { | |
260 | /* Fetch stack pointer from thread structure (if we didn't | |
261 | do so already). */ | |
262 | if (sp == 0) | |
e17a4113 | 263 | sp = read_memory_unsigned_integer (sp_addr, 4, byte_order); |
a28109e0 MK |
264 | |
265 | /* Read the saved register from the stack frame. */ | |
266 | read_memory (sp + i386obsd_uthread_reg_offset[i], buf, 4); | |
267 | regcache_raw_supply (regcache, i, buf); | |
268 | } | |
269 | } | |
a28109e0 MK |
270 | } |
271 | ||
272 | static void | |
273 | i386obsd_collect_uthread (const struct regcache *regcache, | |
274 | int regnum, CORE_ADDR addr) | |
275 | { | |
e17a4113 UW |
276 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
277 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
a28109e0 MK |
278 | CORE_ADDR sp_addr = addr + I386OBSD_UTHREAD_ESP_OFFSET; |
279 | CORE_ADDR sp = 0; | |
63c0089f | 280 | gdb_byte buf[4]; |
a28109e0 MK |
281 | int i; |
282 | ||
283 | gdb_assert (regnum >= -1); | |
284 | ||
285 | if (regnum == -1 || regnum == I386_ESP_REGNUM) | |
286 | { | |
287 | int offset; | |
288 | ||
289 | /* Calculate the stack pointer (frame pointer) that will be | |
290 | stored into the thread structure. */ | |
291 | offset = i386obsd_uthread_reg_offset[I386_EIP_REGNUM] + 4; | |
292 | regcache_raw_collect (regcache, I386_ESP_REGNUM, buf); | |
e17a4113 | 293 | sp = extract_unsigned_integer (buf, 4, byte_order) - offset; |
a28109e0 MK |
294 | |
295 | /* Store the stack pointer. */ | |
e17a4113 | 296 | write_memory_unsigned_integer (sp_addr, 4, byte_order, sp); |
a28109e0 MK |
297 | |
298 | /* The stack pointer was (potentially) modified. Make sure we | |
299 | build a proper stack frame. */ | |
300 | regnum = -1; | |
301 | } | |
302 | ||
303 | for (i = 0; i < ARRAY_SIZE (i386obsd_uthread_reg_offset); i++) | |
304 | { | |
305 | if (i386obsd_uthread_reg_offset[i] != -1 | |
306 | && (regnum == -1 || regnum == i)) | |
307 | { | |
308 | /* Fetch stack pointer from thread structure (if we didn't | |
309 | calculate it already). */ | |
310 | if (sp == 0) | |
e17a4113 | 311 | sp = read_memory_unsigned_integer (sp_addr, 4, byte_order); |
a28109e0 MK |
312 | |
313 | /* Write the register into the stack frame. */ | |
314 | regcache_raw_collect (regcache, i, buf); | |
315 | write_memory (sp + i386obsd_uthread_reg_offset[i], buf, 4); | |
316 | } | |
317 | } | |
318 | } | |
508fbfea MK |
319 | \f |
320 | /* Kernel debugging support. */ | |
321 | ||
322 | /* From <machine/frame.h>. Note that %esp and %ess are only saved in | |
323 | a trap frame when entering the kernel from user space. */ | |
324 | static int i386obsd_tf_reg_offset[] = | |
325 | { | |
326 | 10 * 4, /* %eax */ | |
327 | 9 * 4, /* %ecx */ | |
328 | 8 * 4, /* %edx */ | |
329 | 7 * 4, /* %ebx */ | |
330 | -1, /* %esp */ | |
331 | 6 * 4, /* %ebp */ | |
332 | 5 * 4, /* %esi */ | |
333 | 4 * 4, /* %edi */ | |
334 | 13 * 4, /* %eip */ | |
335 | 15 * 4, /* %eflags */ | |
336 | 14 * 4, /* %cs */ | |
337 | -1, /* %ss */ | |
338 | 3 * 4, /* %ds */ | |
339 | 2 * 4, /* %es */ | |
340 | 0 * 4, /* %fs */ | |
341 | 1 * 4 /* %gs */ | |
342 | }; | |
343 | ||
344 | static struct trad_frame_cache * | |
10458914 | 345 | i386obsd_trapframe_cache (struct frame_info *this_frame, void **this_cache) |
508fbfea | 346 | { |
e17a4113 UW |
347 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
348 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
508fbfea MK |
349 | struct trad_frame_cache *cache; |
350 | CORE_ADDR func, sp, addr; | |
351 | ULONGEST cs; | |
7238f002 | 352 | char *name; |
508fbfea MK |
353 | int i; |
354 | ||
355 | if (*this_cache) | |
356 | return *this_cache; | |
357 | ||
10458914 | 358 | cache = trad_frame_cache_zalloc (this_frame); |
508fbfea MK |
359 | *this_cache = cache; |
360 | ||
10458914 DJ |
361 | func = get_frame_func (this_frame); |
362 | sp = get_frame_register_unsigned (this_frame, I386_ESP_REGNUM); | |
7238f002 MK |
363 | |
364 | find_pc_partial_function (func, &name, NULL, NULL); | |
6d566cff | 365 | if (name && strncmp (name, "Xintr", 5) == 0) |
7238f002 MK |
366 | addr = sp + 8; /* It's an interrupt frame. */ |
367 | else | |
368 | addr = sp; | |
369 | ||
508fbfea MK |
370 | for (i = 0; i < ARRAY_SIZE (i386obsd_tf_reg_offset); i++) |
371 | if (i386obsd_tf_reg_offset[i] != -1) | |
7238f002 | 372 | trad_frame_set_reg_addr (cache, i, addr + i386obsd_tf_reg_offset[i]); |
508fbfea MK |
373 | |
374 | /* Read %cs from trap frame. */ | |
7238f002 | 375 | addr += i386obsd_tf_reg_offset[I386_CS_REGNUM]; |
e17a4113 | 376 | cs = read_memory_unsigned_integer (addr, 4, byte_order); |
508fbfea MK |
377 | if ((cs & I386_SEL_RPL) == I386_SEL_UPL) |
378 | { | |
6d566cff | 379 | /* Trap from user space; terminate backtrace. */ |
005ca36a | 380 | trad_frame_set_id (cache, outer_frame_id); |
508fbfea MK |
381 | } |
382 | else | |
383 | { | |
384 | /* Construct the frame ID using the function start. */ | |
385 | trad_frame_set_id (cache, frame_id_build (sp + 8, func)); | |
386 | } | |
387 | ||
388 | return cache; | |
389 | } | |
390 | ||
391 | static void | |
10458914 | 392 | i386obsd_trapframe_this_id (struct frame_info *this_frame, |
508fbfea MK |
393 | void **this_cache, struct frame_id *this_id) |
394 | { | |
395 | struct trad_frame_cache *cache = | |
10458914 | 396 | i386obsd_trapframe_cache (this_frame, this_cache); |
508fbfea MK |
397 | |
398 | trad_frame_get_id (cache, this_id); | |
399 | } | |
400 | ||
10458914 DJ |
401 | static struct value * |
402 | i386obsd_trapframe_prev_register (struct frame_info *this_frame, | |
403 | void **this_cache, int regnum) | |
508fbfea MK |
404 | { |
405 | struct trad_frame_cache *cache = | |
10458914 | 406 | i386obsd_trapframe_cache (this_frame, this_cache); |
508fbfea | 407 | |
10458914 | 408 | return trad_frame_get_register (cache, this_frame, regnum); |
508fbfea MK |
409 | } |
410 | ||
7238f002 MK |
411 | static int |
412 | i386obsd_trapframe_sniffer (const struct frame_unwind *self, | |
10458914 | 413 | struct frame_info *this_frame, |
7238f002 | 414 | void **this_prologue_cache) |
508fbfea MK |
415 | { |
416 | ULONGEST cs; | |
417 | char *name; | |
418 | ||
e5cc6d11 | 419 | /* Check Current Privilege Level and bail out if we're not executing |
6d566cff | 420 | in kernel space. */ |
10458914 | 421 | cs = get_frame_register_unsigned (this_frame, I386_CS_REGNUM); |
508fbfea | 422 | if ((cs & I386_SEL_RPL) == I386_SEL_UPL) |
6d566cff | 423 | return 0; |
508fbfea | 424 | |
10458914 | 425 | find_pc_partial_function (get_frame_pc (this_frame), &name, NULL, NULL); |
3597fb82 MK |
426 | return (name && (strcmp (name, "calltrap") == 0 |
427 | || strcmp (name, "syscall1") == 0 | |
428 | || strncmp (name, "Xintr", 5) == 0 | |
429 | || strncmp (name, "Xsoft", 5) == 0)); | |
508fbfea | 430 | } |
7238f002 MK |
431 | |
432 | static const struct frame_unwind i386obsd_trapframe_unwind = { | |
433 | /* FIXME: kettenis/20051219: This really is more like an interrupt | |
434 | frame, but SIGTRAMP_FRAME would print <signal handler called>, | |
435 | which really is not what we want here. */ | |
436 | NORMAL_FRAME, | |
437 | i386obsd_trapframe_this_id, | |
438 | i386obsd_trapframe_prev_register, | |
439 | NULL, | |
440 | i386obsd_trapframe_sniffer | |
441 | }; | |
508fbfea | 442 | \f |
a28109e0 | 443 | |
005328e3 MK |
444 | static void |
445 | i386obsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) | |
446 | { | |
447 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
448 | ||
449 | /* Obviously OpenBSD is BSD-based. */ | |
450 | i386bsd_init_abi (info, gdbarch); | |
451 | ||
67457012 MK |
452 | /* OpenBSD has a different `struct reg'. */ |
453 | tdep->gregset_reg_offset = i386obsd_r_reg_offset; | |
454 | tdep->gregset_num_regs = ARRAY_SIZE (i386obsd_r_reg_offset); | |
455 | tdep->sizeof_gregset = 16 * 4; | |
456 | ||
005328e3 MK |
457 | /* OpenBSD uses -freg-struct-return by default. */ |
458 | tdep->struct_return = reg_struct_return; | |
459 | ||
460 | /* OpenBSD uses a different memory layout. */ | |
5d93ae8c MK |
461 | tdep->sigtramp_start = i386obsd_sigtramp_start_addr; |
462 | tdep->sigtramp_end = i386obsd_sigtramp_end_addr; | |
911bc6ee | 463 | tdep->sigtramp_p = i386obsd_sigtramp_p; |
005328e3 MK |
464 | |
465 | /* OpenBSD has a `struct sigcontext' that's different from the | |
f2e7c15d | 466 | original 4.3 BSD. */ |
a3386186 | 467 | tdep->sc_reg_offset = i386obsd_sc_reg_offset; |
67457012 | 468 | tdep->sc_num_regs = ARRAY_SIZE (i386obsd_sc_reg_offset); |
a28109e0 MK |
469 | |
470 | /* OpenBSD provides a user-level threads implementation. */ | |
471 | bsd_uthread_set_supply_uthread (gdbarch, i386obsd_supply_uthread); | |
472 | bsd_uthread_set_collect_uthread (gdbarch, i386obsd_collect_uthread); | |
508fbfea MK |
473 | |
474 | /* Unwind kernel trap frames correctly. */ | |
7238f002 | 475 | frame_unwind_prepend_unwinder (gdbarch, &i386obsd_trapframe_unwind); |
005328e3 | 476 | } |
60a6eeb6 MK |
477 | |
478 | /* OpenBSD a.out. */ | |
479 | ||
480 | static void | |
481 | i386obsd_aout_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) | |
482 | { | |
483 | i386obsd_init_abi (info, gdbarch); | |
484 | ||
485 | /* OpenBSD a.out has a single register set. */ | |
486 | set_gdbarch_regset_from_core_section | |
487 | (gdbarch, i386obsd_aout_regset_from_core_section); | |
488 | } | |
489 | ||
490 | /* OpenBSD ELF. */ | |
491 | ||
492 | static void | |
493 | i386obsd_elf_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) | |
494 | { | |
495 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
496 | ||
497 | /* It's still OpenBSD. */ | |
498 | i386obsd_init_abi (info, gdbarch); | |
499 | ||
500 | /* But ELF-based. */ | |
501 | i386_elf_init_abi (info, gdbarch); | |
502 | ||
503 | /* OpenBSD ELF uses SVR4-style shared libraries. */ | |
60a6eeb6 MK |
504 | set_solib_svr4_fetch_link_map_offsets |
505 | (gdbarch, svr4_ilp32_fetch_link_map_offsets); | |
506 | } | |
67457012 MK |
507 | \f |
508 | ||
509 | /* Provide a prototype to silence -Wmissing-prototypes. */ | |
510 | void _initialize_i386obsd_tdep (void); | |
005328e3 MK |
511 | |
512 | void | |
513 | _initialize_i386obsd_tdep (void) | |
514 | { | |
005328e3 MK |
515 | /* FIXME: kettenis/20021020: Since OpenBSD/i386 binaries are |
516 | indistingushable from NetBSD/i386 a.out binaries, building a GDB | |
517 | that should support both these targets will probably not work as | |
518 | expected. */ | |
519 | #define GDB_OSABI_OPENBSD_AOUT GDB_OSABI_NETBSD_AOUT | |
520 | ||
05816f70 | 521 | gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_OPENBSD_AOUT, |
60a6eeb6 MK |
522 | i386obsd_aout_init_abi); |
523 | gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_OPENBSD_ELF, | |
524 | i386obsd_elf_init_abi); | |
005328e3 | 525 | } |