Commit | Line | Data |
---|---|---|
040baaf6 GB |
1 | /* Native-dependent code for GNU/Linux x86 (i386 and x86-64). |
2 | ||
32d0add0 | 3 | Copyright (C) 1999-2015 Free Software Foundation, Inc. |
040baaf6 GB |
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 | |
9 | the Free Software Foundation; either version 3 of the License, or | |
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 | |
18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
19 | ||
20 | #include "defs.h" | |
21 | #include "inferior.h" | |
22 | #include "elf/common.h" | |
23 | #include "gdb_proc_service.h" | |
24 | #include <sys/ptrace.h> | |
25 | #include <sys/user.h> | |
26 | #include <sys/procfs.h> | |
72fde3df | 27 | #include <sys/uio.h> |
040baaf6 | 28 | |
df7e5265 | 29 | #include "x86-nat.h" |
040baaf6 GB |
30 | #include "linux-nat.h" |
31 | #ifndef __x86_64__ | |
32 | #include "i386-linux-nat.h" | |
33 | #endif | |
34 | #include "x86-linux-nat.h" | |
35 | #include "i386-linux-tdep.h" | |
36 | #ifdef __x86_64__ | |
37 | #include "amd64-linux-tdep.h" | |
38 | #endif | |
df7e5265 | 39 | #include "x86-xstate.h" |
040baaf6 | 40 | #include "nat/linux-btrace.h" |
7b669087 | 41 | #include "nat/linux-nat.h" |
040baaf6 GB |
42 | |
43 | /* Per-thread arch-specific data we want to keep. */ | |
44 | ||
45 | struct arch_lwp_info | |
46 | { | |
47 | /* Non-zero if our copy differs from what's recorded in the thread. */ | |
48 | int debug_registers_changed; | |
49 | }; | |
50 | ||
51 | /* Does the current host support PTRACE_GETREGSET? */ | |
52 | int have_ptrace_getregset = -1; | |
53 | \f | |
54 | ||
4180215b PA |
55 | /* Return the offset of REGNUM in the u_debugreg field of struct |
56 | user. */ | |
57 | ||
58 | static int | |
59 | u_debugreg_offset (int regnum) | |
60 | { | |
61 | return (offsetof (struct user, u_debugreg) | |
62 | + sizeof (((struct user *) 0)->u_debugreg[0]) * regnum); | |
63 | } | |
64 | ||
040baaf6 GB |
65 | /* Support for debug registers. */ |
66 | ||
67 | /* Get debug register REGNUM value from only the one LWP of PTID. */ | |
68 | ||
69 | static unsigned long | |
70 | x86_linux_dr_get (ptid_t ptid, int regnum) | |
71 | { | |
72 | int tid; | |
73 | unsigned long value; | |
74 | ||
5ee44bfa | 75 | gdb_assert (ptid_lwp_p (ptid)); |
040baaf6 | 76 | tid = ptid_get_lwp (ptid); |
040baaf6 GB |
77 | |
78 | errno = 0; | |
4180215b PA |
79 | value = ptrace (PTRACE_PEEKUSER, tid, u_debugreg_offset (regnum), 0); |
80 | ||
040baaf6 GB |
81 | if (errno != 0) |
82 | perror_with_name (_("Couldn't read debug register")); | |
83 | ||
84 | return value; | |
85 | } | |
86 | ||
87 | /* Set debug register REGNUM to VALUE in only the one LWP of PTID. */ | |
88 | ||
89 | static void | |
90 | x86_linux_dr_set (ptid_t ptid, int regnum, unsigned long value) | |
91 | { | |
92 | int tid; | |
93 | ||
5ee44bfa | 94 | gdb_assert (ptid_lwp_p (ptid)); |
040baaf6 | 95 | tid = ptid_get_lwp (ptid); |
040baaf6 GB |
96 | |
97 | errno = 0; | |
4180215b | 98 | ptrace (PTRACE_POKEUSER, tid, u_debugreg_offset (regnum), value); |
040baaf6 GB |
99 | if (errno != 0) |
100 | perror_with_name (_("Couldn't write debug register")); | |
101 | } | |
102 | ||
103 | /* Return the inferior's debug register REGNUM. */ | |
104 | ||
105 | static CORE_ADDR | |
106 | x86_linux_dr_get_addr (int regnum) | |
107 | { | |
108 | /* DR6 and DR7 are retrieved with some other way. */ | |
109 | gdb_assert (DR_FIRSTADDR <= regnum && regnum <= DR_LASTADDR); | |
110 | ||
7b669087 | 111 | return x86_linux_dr_get (current_lwp_ptid (), regnum); |
040baaf6 GB |
112 | } |
113 | ||
114 | /* Return the inferior's DR7 debug control register. */ | |
115 | ||
116 | static unsigned long | |
117 | x86_linux_dr_get_control (void) | |
118 | { | |
7b669087 | 119 | return x86_linux_dr_get (current_lwp_ptid (), DR_CONTROL); |
040baaf6 GB |
120 | } |
121 | ||
122 | /* Get DR_STATUS from only the one LWP of INFERIOR_PTID. */ | |
123 | ||
124 | static unsigned long | |
125 | x86_linux_dr_get_status (void) | |
126 | { | |
7b669087 | 127 | return x86_linux_dr_get (current_lwp_ptid (), DR_STATUS); |
040baaf6 GB |
128 | } |
129 | ||
130 | /* Callback for iterate_over_lwps. Update the debug registers of | |
131 | LWP. */ | |
132 | ||
133 | static int | |
134 | update_debug_registers_callback (struct lwp_info *lwp, void *arg) | |
135 | { | |
136 | if (lwp->arch_private == NULL) | |
137 | lwp->arch_private = XCNEW (struct arch_lwp_info); | |
138 | ||
139 | /* The actual update is done later just before resuming the lwp, we | |
140 | just mark that the registers need updating. */ | |
141 | lwp->arch_private->debug_registers_changed = 1; | |
142 | ||
143 | /* If the lwp isn't stopped, force it to momentarily pause, so we | |
144 | can update its debug registers. */ | |
cff068da | 145 | if (!lwp_is_stopped (lwp)) |
040baaf6 GB |
146 | linux_stop_lwp (lwp); |
147 | ||
148 | /* Continue the iteration. */ | |
149 | return 0; | |
150 | } | |
151 | ||
152 | /* Set DR_CONTROL to CONTROL in all LWPs of the current inferior. */ | |
153 | ||
154 | static void | |
155 | x86_linux_dr_set_control (unsigned long control) | |
156 | { | |
7b669087 | 157 | ptid_t pid_ptid = pid_to_ptid (ptid_get_pid (current_lwp_ptid ())); |
040baaf6 GB |
158 | |
159 | iterate_over_lwps (pid_ptid, update_debug_registers_callback, NULL); | |
160 | } | |
161 | ||
162 | /* Set address REGNUM (zero based) to ADDR in all LWPs of the current | |
163 | inferior. */ | |
164 | ||
165 | static void | |
166 | x86_linux_dr_set_addr (int regnum, CORE_ADDR addr) | |
167 | { | |
7b669087 | 168 | ptid_t pid_ptid = pid_to_ptid (ptid_get_pid (current_lwp_ptid ())); |
040baaf6 GB |
169 | |
170 | gdb_assert (regnum >= 0 && regnum <= DR_LASTADDR - DR_FIRSTADDR); | |
171 | ||
172 | iterate_over_lwps (pid_ptid, update_debug_registers_callback, NULL); | |
173 | } | |
174 | ||
175 | /* Called when resuming a thread. | |
176 | If the debug regs have changed, update the thread's copies. */ | |
177 | ||
178 | static void | |
179 | x86_linux_prepare_to_resume (struct lwp_info *lwp) | |
180 | { | |
cff068da | 181 | ptid_t ptid = ptid_of_lwp (lwp); |
040baaf6 GB |
182 | int clear_status = 0; |
183 | ||
184 | /* NULL means this is the main thread still going through the shell, | |
185 | or, no watchpoint has been set yet. In that case, there's | |
186 | nothing to do. */ | |
187 | if (lwp->arch_private == NULL) | |
188 | return; | |
189 | ||
190 | if (lwp->arch_private->debug_registers_changed) | |
191 | { | |
df7e5265 | 192 | struct x86_debug_reg_state *state |
cff068da | 193 | = x86_debug_reg_state (ptid_get_pid (ptid)); |
040baaf6 GB |
194 | int i; |
195 | ||
196 | /* On Linux kernel before 2.6.33 commit | |
197 | 72f674d203cd230426437cdcf7dd6f681dad8b0d | |
198 | if you enable a breakpoint by the DR_CONTROL bits you need to have | |
199 | already written the corresponding DR_FIRSTADDR...DR_LASTADDR registers. | |
200 | ||
201 | Ensure DR_CONTROL gets written as the very last register here. */ | |
202 | ||
203 | /* Clear DR_CONTROL first. In some cases, setting DR0-3 to a | |
204 | value that doesn't match what is enabled in DR_CONTROL | |
205 | results in EINVAL. */ | |
cff068da | 206 | x86_linux_dr_set (ptid, DR_CONTROL, 0); |
040baaf6 | 207 | |
97ea6506 | 208 | ALL_DEBUG_ADDRESS_REGISTERS (i) |
040baaf6 GB |
209 | if (state->dr_ref_count[i] > 0) |
210 | { | |
cff068da | 211 | x86_linux_dr_set (ptid, i, state->dr_mirror[i]); |
040baaf6 GB |
212 | |
213 | /* If we're setting a watchpoint, any change the inferior | |
214 | had done itself to the debug registers needs to be | |
df7e5265 | 215 | discarded, otherwise, x86_stopped_data_address can get |
040baaf6 GB |
216 | confused. */ |
217 | clear_status = 1; | |
218 | } | |
219 | ||
220 | /* If DR_CONTROL is supposed to be zero, we've already set it | |
221 | above. */ | |
222 | if (state->dr_control_mirror != 0) | |
cff068da | 223 | x86_linux_dr_set (ptid, DR_CONTROL, state->dr_control_mirror); |
040baaf6 GB |
224 | |
225 | lwp->arch_private->debug_registers_changed = 0; | |
226 | } | |
227 | ||
cff068da GB |
228 | if (clear_status |
229 | || lwp_stop_reason (lwp) == TARGET_STOPPED_BY_WATCHPOINT) | |
230 | x86_linux_dr_set (ptid, DR_STATUS, 0); | |
040baaf6 GB |
231 | } |
232 | ||
233 | static void | |
234 | x86_linux_new_thread (struct lwp_info *lp) | |
235 | { | |
236 | struct arch_lwp_info *info = XCNEW (struct arch_lwp_info); | |
237 | ||
238 | info->debug_registers_changed = 1; | |
239 | ||
240 | lp->arch_private = info; | |
241 | } | |
242 | \f | |
243 | ||
244 | /* linux_nat_new_fork hook. */ | |
245 | ||
246 | static void | |
247 | x86_linux_new_fork (struct lwp_info *parent, pid_t child_pid) | |
248 | { | |
249 | pid_t parent_pid; | |
df7e5265 GB |
250 | struct x86_debug_reg_state *parent_state; |
251 | struct x86_debug_reg_state *child_state; | |
040baaf6 GB |
252 | |
253 | /* NULL means no watchpoint has ever been set in the parent. In | |
254 | that case, there's nothing to do. */ | |
255 | if (parent->arch_private == NULL) | |
256 | return; | |
257 | ||
258 | /* Linux kernel before 2.6.33 commit | |
259 | 72f674d203cd230426437cdcf7dd6f681dad8b0d | |
260 | will inherit hardware debug registers from parent | |
261 | on fork/vfork/clone. Newer Linux kernels create such tasks with | |
262 | zeroed debug registers. | |
263 | ||
264 | GDB core assumes the child inherits the watchpoints/hw | |
265 | breakpoints of the parent, and will remove them all from the | |
266 | forked off process. Copy the debug registers mirrors into the | |
267 | new process so that all breakpoints and watchpoints can be | |
268 | removed together. The debug registers mirror will become zeroed | |
269 | in the end before detaching the forked off process, thus making | |
270 | this compatible with older Linux kernels too. */ | |
271 | ||
272 | parent_pid = ptid_get_pid (parent->ptid); | |
df7e5265 GB |
273 | parent_state = x86_debug_reg_state (parent_pid); |
274 | child_state = x86_debug_reg_state (child_pid); | |
040baaf6 GB |
275 | *child_state = *parent_state; |
276 | } | |
277 | \f | |
278 | ||
279 | static void (*super_post_startup_inferior) (struct target_ops *self, | |
280 | ptid_t ptid); | |
281 | ||
282 | static void | |
283 | x86_linux_child_post_startup_inferior (struct target_ops *self, ptid_t ptid) | |
284 | { | |
df7e5265 | 285 | x86_cleanup_dregs (); |
040baaf6 GB |
286 | super_post_startup_inferior (self, ptid); |
287 | } | |
288 | ||
289 | #ifdef __x86_64__ | |
290 | /* Value of CS segment register: | |
291 | 64bit process: 0x33 | |
292 | 32bit process: 0x23 */ | |
293 | #define AMD64_LINUX_USER64_CS 0x33 | |
294 | ||
295 | /* Value of DS segment register: | |
296 | LP64 process: 0x0 | |
297 | X32 process: 0x2b */ | |
298 | #define AMD64_LINUX_X32_DS 0x2b | |
299 | #endif | |
300 | ||
301 | /* Get Linux/x86 target description from running target. */ | |
302 | ||
303 | static const struct target_desc * | |
304 | x86_linux_read_description (struct target_ops *ops) | |
305 | { | |
306 | int tid; | |
307 | int is_64bit = 0; | |
308 | #ifdef __x86_64__ | |
309 | int is_x32; | |
310 | #endif | |
311 | static uint64_t xcr0; | |
312 | uint64_t xcr0_features_bits; | |
313 | ||
314 | /* GNU/Linux LWP ID's are process ID's. */ | |
315 | tid = ptid_get_lwp (inferior_ptid); | |
316 | if (tid == 0) | |
317 | tid = ptid_get_pid (inferior_ptid); /* Not a threaded program. */ | |
318 | ||
319 | #ifdef __x86_64__ | |
320 | { | |
321 | unsigned long cs; | |
322 | unsigned long ds; | |
323 | ||
324 | /* Get CS register. */ | |
325 | errno = 0; | |
326 | cs = ptrace (PTRACE_PEEKUSER, tid, | |
327 | offsetof (struct user_regs_struct, cs), 0); | |
328 | if (errno != 0) | |
329 | perror_with_name (_("Couldn't get CS register")); | |
330 | ||
331 | is_64bit = cs == AMD64_LINUX_USER64_CS; | |
332 | ||
333 | /* Get DS register. */ | |
334 | errno = 0; | |
335 | ds = ptrace (PTRACE_PEEKUSER, tid, | |
336 | offsetof (struct user_regs_struct, ds), 0); | |
337 | if (errno != 0) | |
338 | perror_with_name (_("Couldn't get DS register")); | |
339 | ||
340 | is_x32 = ds == AMD64_LINUX_X32_DS; | |
341 | ||
342 | if (sizeof (void *) == 4 && is_64bit && !is_x32) | |
343 | error (_("Can't debug 64-bit process with 32-bit GDB")); | |
344 | } | |
345 | #elif HAVE_PTRACE_GETFPXREGS | |
346 | if (have_ptrace_getfpxregs == -1) | |
347 | { | |
348 | elf_fpxregset_t fpxregs; | |
349 | ||
350 | if (ptrace (PTRACE_GETFPXREGS, tid, 0, (int) &fpxregs) < 0) | |
351 | { | |
352 | have_ptrace_getfpxregs = 0; | |
353 | have_ptrace_getregset = 0; | |
354 | return tdesc_i386_mmx_linux; | |
355 | } | |
356 | } | |
357 | #endif | |
358 | ||
359 | if (have_ptrace_getregset == -1) | |
360 | { | |
df7e5265 | 361 | uint64_t xstateregs[(X86_XSTATE_SSE_SIZE / sizeof (uint64_t))]; |
040baaf6 GB |
362 | struct iovec iov; |
363 | ||
364 | iov.iov_base = xstateregs; | |
365 | iov.iov_len = sizeof (xstateregs); | |
366 | ||
367 | /* Check if PTRACE_GETREGSET works. */ | |
368 | if (ptrace (PTRACE_GETREGSET, tid, | |
369 | (unsigned int) NT_X86_XSTATE, &iov) < 0) | |
370 | have_ptrace_getregset = 0; | |
371 | else | |
372 | { | |
373 | have_ptrace_getregset = 1; | |
374 | ||
375 | /* Get XCR0 from XSAVE extended state. */ | |
376 | xcr0 = xstateregs[(I386_LINUX_XSAVE_XCR0_OFFSET | |
377 | / sizeof (uint64_t))]; | |
378 | } | |
379 | } | |
380 | ||
381 | /* Check the native XCR0 only if PTRACE_GETREGSET is available. If | |
382 | PTRACE_GETREGSET is not available then set xcr0_features_bits to | |
383 | zero so that the "no-features" descriptions are returned by the | |
384 | switches below. */ | |
385 | if (have_ptrace_getregset) | |
df7e5265 | 386 | xcr0_features_bits = xcr0 & X86_XSTATE_ALL_MASK; |
040baaf6 GB |
387 | else |
388 | xcr0_features_bits = 0; | |
389 | ||
390 | if (is_64bit) | |
391 | { | |
392 | #ifdef __x86_64__ | |
393 | switch (xcr0_features_bits) | |
394 | { | |
df7e5265 GB |
395 | case X86_XSTATE_MPX_AVX512_MASK: |
396 | case X86_XSTATE_AVX512_MASK: | |
040baaf6 GB |
397 | if (is_x32) |
398 | return tdesc_x32_avx512_linux; | |
399 | else | |
400 | return tdesc_amd64_avx512_linux; | |
df7e5265 | 401 | case X86_XSTATE_MPX_MASK: |
040baaf6 GB |
402 | if (is_x32) |
403 | return tdesc_x32_avx_linux; /* No MPX on x32 using AVX. */ | |
404 | else | |
405 | return tdesc_amd64_mpx_linux; | |
df7e5265 | 406 | case X86_XSTATE_AVX_MASK: |
040baaf6 GB |
407 | if (is_x32) |
408 | return tdesc_x32_avx_linux; | |
409 | else | |
410 | return tdesc_amd64_avx_linux; | |
411 | default: | |
412 | if (is_x32) | |
413 | return tdesc_x32_linux; | |
414 | else | |
415 | return tdesc_amd64_linux; | |
416 | } | |
417 | #endif | |
418 | } | |
419 | else | |
420 | { | |
421 | switch (xcr0_features_bits) | |
422 | { | |
df7e5265 GB |
423 | case X86_XSTATE_MPX_AVX512_MASK: |
424 | case X86_XSTATE_AVX512_MASK: | |
040baaf6 | 425 | return tdesc_i386_avx512_linux; |
df7e5265 | 426 | case X86_XSTATE_MPX_MASK: |
040baaf6 | 427 | return tdesc_i386_mpx_linux; |
df7e5265 | 428 | case X86_XSTATE_AVX_MASK: |
040baaf6 GB |
429 | return tdesc_i386_avx_linux; |
430 | default: | |
431 | return tdesc_i386_linux; | |
432 | } | |
433 | } | |
434 | ||
435 | gdb_assert_not_reached ("failed to return tdesc"); | |
436 | } | |
437 | \f | |
438 | ||
439 | /* Enable branch tracing. */ | |
440 | ||
441 | static struct btrace_target_info * | |
f4abbc16 MM |
442 | x86_linux_enable_btrace (struct target_ops *self, ptid_t ptid, |
443 | const struct btrace_config *conf) | |
040baaf6 GB |
444 | { |
445 | struct btrace_target_info *tinfo; | |
446 | struct gdbarch *gdbarch; | |
447 | ||
448 | errno = 0; | |
f4abbc16 | 449 | tinfo = linux_enable_btrace (ptid, conf); |
040baaf6 GB |
450 | |
451 | if (tinfo == NULL) | |
452 | error (_("Could not enable branch tracing for %s: %s."), | |
453 | target_pid_to_str (ptid), safe_strerror (errno)); | |
454 | ||
455 | /* Fill in the size of a pointer in bits. */ | |
d68e53f4 MM |
456 | if (tinfo->ptr_bits == 0) |
457 | { | |
458 | gdbarch = target_thread_architecture (ptid); | |
459 | tinfo->ptr_bits = gdbarch_ptr_bit (gdbarch); | |
460 | } | |
040baaf6 GB |
461 | return tinfo; |
462 | } | |
463 | ||
464 | /* Disable branch tracing. */ | |
465 | ||
466 | static void | |
467 | x86_linux_disable_btrace (struct target_ops *self, | |
468 | struct btrace_target_info *tinfo) | |
469 | { | |
470 | enum btrace_error errcode = linux_disable_btrace (tinfo); | |
471 | ||
472 | if (errcode != BTRACE_ERR_NONE) | |
473 | error (_("Could not disable branch tracing.")); | |
474 | } | |
475 | ||
476 | /* Teardown branch tracing. */ | |
477 | ||
478 | static void | |
479 | x86_linux_teardown_btrace (struct target_ops *self, | |
480 | struct btrace_target_info *tinfo) | |
481 | { | |
482 | /* Ignore errors. */ | |
483 | linux_disable_btrace (tinfo); | |
484 | } | |
485 | ||
486 | static enum btrace_error | |
487 | x86_linux_read_btrace (struct target_ops *self, | |
734b0e4b | 488 | struct btrace_data *data, |
040baaf6 GB |
489 | struct btrace_target_info *btinfo, |
490 | enum btrace_read_type type) | |
491 | { | |
492 | return linux_read_btrace (data, btinfo, type); | |
493 | } | |
f4abbc16 MM |
494 | |
495 | /* See to_btrace_conf in target.h. */ | |
496 | ||
497 | static const struct btrace_config * | |
498 | x86_linux_btrace_conf (struct target_ops *self, | |
499 | const struct btrace_target_info *btinfo) | |
500 | { | |
501 | return linux_btrace_conf (btinfo); | |
502 | } | |
503 | ||
040baaf6 GB |
504 | \f |
505 | ||
506 | /* Helper for ps_get_thread_area. Sets BASE_ADDR to a pointer to | |
507 | the thread local storage (or its descriptor) and returns PS_OK | |
508 | on success. Returns PS_ERR on failure. */ | |
509 | ||
510 | ps_err_e | |
511 | x86_linux_get_thread_area (pid_t pid, void *addr, unsigned int *base_addr) | |
512 | { | |
513 | /* NOTE: cagney/2003-08-26: The definition of this buffer is found | |
514 | in the kernel header <asm-i386/ldt.h>. It, after padding, is 4 x | |
515 | 4 byte integers in size: `entry_number', `base_addr', `limit', | |
516 | and a bunch of status bits. | |
517 | ||
518 | The values returned by this ptrace call should be part of the | |
519 | regcache buffer, and ps_get_thread_area should channel its | |
520 | request through the regcache. That way remote targets could | |
521 | provide the value using the remote protocol and not this direct | |
522 | call. | |
523 | ||
524 | Is this function needed? I'm guessing that the `base' is the | |
525 | address of a descriptor that libthread_db uses to find the | |
526 | thread local address base that GDB needs. Perhaps that | |
527 | descriptor is defined by the ABI. Anyway, given that | |
528 | libthread_db calls this function without prompting (gdb | |
529 | requesting tls base) I guess it needs info in there anyway. */ | |
530 | unsigned int desc[4]; | |
531 | ||
532 | /* This code assumes that "int" is 32 bits and that | |
533 | GET_THREAD_AREA returns no more than 4 int values. */ | |
534 | gdb_assert (sizeof (int) == 4); | |
535 | ||
536 | #ifndef PTRACE_GET_THREAD_AREA | |
537 | #define PTRACE_GET_THREAD_AREA 25 | |
538 | #endif | |
539 | ||
540 | if (ptrace (PTRACE_GET_THREAD_AREA, pid, addr, &desc) < 0) | |
541 | return PS_ERR; | |
542 | ||
543 | *base_addr = desc[1]; | |
544 | return PS_OK; | |
545 | } | |
546 | \f | |
547 | ||
548 | /* Create an x86 GNU/Linux target. */ | |
549 | ||
550 | struct target_ops * | |
551 | x86_linux_create_target (void) | |
552 | { | |
553 | /* Fill in the generic GNU/Linux methods. */ | |
554 | struct target_ops *t = linux_target (); | |
555 | ||
556 | /* Initialize the debug register function vectors. */ | |
df7e5265 GB |
557 | x86_use_watchpoints (t); |
558 | x86_dr_low.set_control = x86_linux_dr_set_control; | |
559 | x86_dr_low.set_addr = x86_linux_dr_set_addr; | |
560 | x86_dr_low.get_addr = x86_linux_dr_get_addr; | |
561 | x86_dr_low.get_status = x86_linux_dr_get_status; | |
562 | x86_dr_low.get_control = x86_linux_dr_get_control; | |
563 | x86_set_debug_register_length (sizeof (void *)); | |
040baaf6 GB |
564 | |
565 | /* Override the GNU/Linux inferior startup hook. */ | |
566 | super_post_startup_inferior = t->to_post_startup_inferior; | |
567 | t->to_post_startup_inferior = x86_linux_child_post_startup_inferior; | |
568 | ||
569 | /* Add the description reader. */ | |
570 | t->to_read_description = x86_linux_read_description; | |
571 | ||
572 | /* Add btrace methods. */ | |
573 | t->to_supports_btrace = linux_supports_btrace; | |
574 | t->to_enable_btrace = x86_linux_enable_btrace; | |
575 | t->to_disable_btrace = x86_linux_disable_btrace; | |
576 | t->to_teardown_btrace = x86_linux_teardown_btrace; | |
577 | t->to_read_btrace = x86_linux_read_btrace; | |
f4abbc16 | 578 | t->to_btrace_conf = x86_linux_btrace_conf; |
040baaf6 GB |
579 | |
580 | return t; | |
581 | } | |
582 | ||
583 | /* Add an x86 GNU/Linux target. */ | |
584 | ||
585 | void | |
586 | x86_linux_add_target (struct target_ops *t) | |
587 | { | |
588 | linux_nat_add_target (t); | |
589 | linux_nat_set_new_thread (t, x86_linux_new_thread); | |
590 | linux_nat_set_new_fork (t, x86_linux_new_fork); | |
df7e5265 | 591 | linux_nat_set_forget_process (t, x86_forget_process); |
040baaf6 GB |
592 | linux_nat_set_prepare_to_resume (t, x86_linux_prepare_to_resume); |
593 | } |