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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 GB |
40 | #include "nat/linux-btrace.h" |
41 | ||
42 | /* Per-thread arch-specific data we want to keep. */ | |
43 | ||
44 | struct arch_lwp_info | |
45 | { | |
46 | /* Non-zero if our copy differs from what's recorded in the thread. */ | |
47 | int debug_registers_changed; | |
48 | }; | |
49 | ||
50 | /* Does the current host support PTRACE_GETREGSET? */ | |
51 | int have_ptrace_getregset = -1; | |
52 | \f | |
53 | ||
4180215b PA |
54 | /* Return the offset of REGNUM in the u_debugreg field of struct |
55 | user. */ | |
56 | ||
57 | static int | |
58 | u_debugreg_offset (int regnum) | |
59 | { | |
60 | return (offsetof (struct user, u_debugreg) | |
61 | + sizeof (((struct user *) 0)->u_debugreg[0]) * regnum); | |
62 | } | |
63 | ||
040baaf6 GB |
64 | /* Support for debug registers. */ |
65 | ||
66 | /* Get debug register REGNUM value from only the one LWP of PTID. */ | |
67 | ||
68 | static unsigned long | |
69 | x86_linux_dr_get (ptid_t ptid, int regnum) | |
70 | { | |
71 | int tid; | |
72 | unsigned long value; | |
73 | ||
5ee44bfa | 74 | gdb_assert (ptid_lwp_p (ptid)); |
040baaf6 | 75 | tid = ptid_get_lwp (ptid); |
040baaf6 GB |
76 | |
77 | errno = 0; | |
4180215b PA |
78 | value = ptrace (PTRACE_PEEKUSER, tid, u_debugreg_offset (regnum), 0); |
79 | ||
040baaf6 GB |
80 | if (errno != 0) |
81 | perror_with_name (_("Couldn't read debug register")); | |
82 | ||
83 | return value; | |
84 | } | |
85 | ||
86 | /* Set debug register REGNUM to VALUE in only the one LWP of PTID. */ | |
87 | ||
88 | static void | |
89 | x86_linux_dr_set (ptid_t ptid, int regnum, unsigned long value) | |
90 | { | |
91 | int tid; | |
92 | ||
5ee44bfa | 93 | gdb_assert (ptid_lwp_p (ptid)); |
040baaf6 | 94 | tid = ptid_get_lwp (ptid); |
040baaf6 GB |
95 | |
96 | errno = 0; | |
4180215b | 97 | ptrace (PTRACE_POKEUSER, tid, u_debugreg_offset (regnum), value); |
040baaf6 GB |
98 | if (errno != 0) |
99 | perror_with_name (_("Couldn't write debug register")); | |
100 | } | |
101 | ||
102 | /* Return the inferior's debug register REGNUM. */ | |
103 | ||
104 | static CORE_ADDR | |
105 | x86_linux_dr_get_addr (int regnum) | |
106 | { | |
107 | /* DR6 and DR7 are retrieved with some other way. */ | |
108 | gdb_assert (DR_FIRSTADDR <= regnum && regnum <= DR_LASTADDR); | |
109 | ||
110 | return x86_linux_dr_get (inferior_ptid, regnum); | |
111 | } | |
112 | ||
113 | /* Return the inferior's DR7 debug control register. */ | |
114 | ||
115 | static unsigned long | |
116 | x86_linux_dr_get_control (void) | |
117 | { | |
118 | return x86_linux_dr_get (inferior_ptid, DR_CONTROL); | |
119 | } | |
120 | ||
121 | /* Get DR_STATUS from only the one LWP of INFERIOR_PTID. */ | |
122 | ||
123 | static unsigned long | |
124 | x86_linux_dr_get_status (void) | |
125 | { | |
126 | return x86_linux_dr_get (inferior_ptid, DR_STATUS); | |
127 | } | |
128 | ||
129 | /* Callback for iterate_over_lwps. Update the debug registers of | |
130 | LWP. */ | |
131 | ||
132 | static int | |
133 | update_debug_registers_callback (struct lwp_info *lwp, void *arg) | |
134 | { | |
135 | if (lwp->arch_private == NULL) | |
136 | lwp->arch_private = XCNEW (struct arch_lwp_info); | |
137 | ||
138 | /* The actual update is done later just before resuming the lwp, we | |
139 | just mark that the registers need updating. */ | |
140 | lwp->arch_private->debug_registers_changed = 1; | |
141 | ||
142 | /* If the lwp isn't stopped, force it to momentarily pause, so we | |
143 | can update its debug registers. */ | |
144 | if (!lwp->stopped) | |
145 | linux_stop_lwp (lwp); | |
146 | ||
147 | /* Continue the iteration. */ | |
148 | return 0; | |
149 | } | |
150 | ||
151 | /* Set DR_CONTROL to CONTROL in all LWPs of the current inferior. */ | |
152 | ||
153 | static void | |
154 | x86_linux_dr_set_control (unsigned long control) | |
155 | { | |
156 | ptid_t pid_ptid = pid_to_ptid (ptid_get_pid (inferior_ptid)); | |
157 | ||
158 | iterate_over_lwps (pid_ptid, update_debug_registers_callback, NULL); | |
159 | } | |
160 | ||
161 | /* Set address REGNUM (zero based) to ADDR in all LWPs of the current | |
162 | inferior. */ | |
163 | ||
164 | static void | |
165 | x86_linux_dr_set_addr (int regnum, CORE_ADDR addr) | |
166 | { | |
167 | ptid_t pid_ptid = pid_to_ptid (ptid_get_pid (inferior_ptid)); | |
168 | ||
169 | gdb_assert (regnum >= 0 && regnum <= DR_LASTADDR - DR_FIRSTADDR); | |
170 | ||
171 | iterate_over_lwps (pid_ptid, update_debug_registers_callback, NULL); | |
172 | } | |
173 | ||
174 | /* Called when resuming a thread. | |
175 | If the debug regs have changed, update the thread's copies. */ | |
176 | ||
177 | static void | |
178 | x86_linux_prepare_to_resume (struct lwp_info *lwp) | |
179 | { | |
180 | int clear_status = 0; | |
181 | ||
182 | /* NULL means this is the main thread still going through the shell, | |
183 | or, no watchpoint has been set yet. In that case, there's | |
184 | nothing to do. */ | |
185 | if (lwp->arch_private == NULL) | |
186 | return; | |
187 | ||
188 | if (lwp->arch_private->debug_registers_changed) | |
189 | { | |
df7e5265 GB |
190 | struct x86_debug_reg_state *state |
191 | = x86_debug_reg_state (ptid_get_pid (lwp->ptid)); | |
040baaf6 GB |
192 | int i; |
193 | ||
194 | /* On Linux kernel before 2.6.33 commit | |
195 | 72f674d203cd230426437cdcf7dd6f681dad8b0d | |
196 | if you enable a breakpoint by the DR_CONTROL bits you need to have | |
197 | already written the corresponding DR_FIRSTADDR...DR_LASTADDR registers. | |
198 | ||
199 | Ensure DR_CONTROL gets written as the very last register here. */ | |
200 | ||
201 | /* Clear DR_CONTROL first. In some cases, setting DR0-3 to a | |
202 | value that doesn't match what is enabled in DR_CONTROL | |
203 | results in EINVAL. */ | |
204 | x86_linux_dr_set (lwp->ptid, DR_CONTROL, 0); | |
205 | ||
97ea6506 | 206 | ALL_DEBUG_ADDRESS_REGISTERS (i) |
040baaf6 GB |
207 | if (state->dr_ref_count[i] > 0) |
208 | { | |
209 | x86_linux_dr_set (lwp->ptid, i, state->dr_mirror[i]); | |
210 | ||
211 | /* If we're setting a watchpoint, any change the inferior | |
212 | had done itself to the debug registers needs to be | |
df7e5265 | 213 | discarded, otherwise, x86_stopped_data_address can get |
040baaf6 GB |
214 | confused. */ |
215 | clear_status = 1; | |
216 | } | |
217 | ||
218 | /* If DR_CONTROL is supposed to be zero, we've already set it | |
219 | above. */ | |
220 | if (state->dr_control_mirror != 0) | |
221 | x86_linux_dr_set (lwp->ptid, DR_CONTROL, state->dr_control_mirror); | |
222 | ||
223 | lwp->arch_private->debug_registers_changed = 0; | |
224 | } | |
225 | ||
9c02b525 | 226 | if (clear_status || lwp->stop_reason == LWP_STOPPED_BY_WATCHPOINT) |
040baaf6 GB |
227 | x86_linux_dr_set (lwp->ptid, DR_STATUS, 0); |
228 | } | |
229 | ||
230 | static void | |
231 | x86_linux_new_thread (struct lwp_info *lp) | |
232 | { | |
233 | struct arch_lwp_info *info = XCNEW (struct arch_lwp_info); | |
234 | ||
235 | info->debug_registers_changed = 1; | |
236 | ||
237 | lp->arch_private = info; | |
238 | } | |
239 | \f | |
240 | ||
241 | /* linux_nat_new_fork hook. */ | |
242 | ||
243 | static void | |
244 | x86_linux_new_fork (struct lwp_info *parent, pid_t child_pid) | |
245 | { | |
246 | pid_t parent_pid; | |
df7e5265 GB |
247 | struct x86_debug_reg_state *parent_state; |
248 | struct x86_debug_reg_state *child_state; | |
040baaf6 GB |
249 | |
250 | /* NULL means no watchpoint has ever been set in the parent. In | |
251 | that case, there's nothing to do. */ | |
252 | if (parent->arch_private == NULL) | |
253 | return; | |
254 | ||
255 | /* Linux kernel before 2.6.33 commit | |
256 | 72f674d203cd230426437cdcf7dd6f681dad8b0d | |
257 | will inherit hardware debug registers from parent | |
258 | on fork/vfork/clone. Newer Linux kernels create such tasks with | |
259 | zeroed debug registers. | |
260 | ||
261 | GDB core assumes the child inherits the watchpoints/hw | |
262 | breakpoints of the parent, and will remove them all from the | |
263 | forked off process. Copy the debug registers mirrors into the | |
264 | new process so that all breakpoints and watchpoints can be | |
265 | removed together. The debug registers mirror will become zeroed | |
266 | in the end before detaching the forked off process, thus making | |
267 | this compatible with older Linux kernels too. */ | |
268 | ||
269 | parent_pid = ptid_get_pid (parent->ptid); | |
df7e5265 GB |
270 | parent_state = x86_debug_reg_state (parent_pid); |
271 | child_state = x86_debug_reg_state (child_pid); | |
040baaf6 GB |
272 | *child_state = *parent_state; |
273 | } | |
274 | \f | |
275 | ||
276 | static void (*super_post_startup_inferior) (struct target_ops *self, | |
277 | ptid_t ptid); | |
278 | ||
279 | static void | |
280 | x86_linux_child_post_startup_inferior (struct target_ops *self, ptid_t ptid) | |
281 | { | |
df7e5265 | 282 | x86_cleanup_dregs (); |
040baaf6 GB |
283 | super_post_startup_inferior (self, ptid); |
284 | } | |
285 | ||
286 | #ifdef __x86_64__ | |
287 | /* Value of CS segment register: | |
288 | 64bit process: 0x33 | |
289 | 32bit process: 0x23 */ | |
290 | #define AMD64_LINUX_USER64_CS 0x33 | |
291 | ||
292 | /* Value of DS segment register: | |
293 | LP64 process: 0x0 | |
294 | X32 process: 0x2b */ | |
295 | #define AMD64_LINUX_X32_DS 0x2b | |
296 | #endif | |
297 | ||
298 | /* Get Linux/x86 target description from running target. */ | |
299 | ||
300 | static const struct target_desc * | |
301 | x86_linux_read_description (struct target_ops *ops) | |
302 | { | |
303 | int tid; | |
304 | int is_64bit = 0; | |
305 | #ifdef __x86_64__ | |
306 | int is_x32; | |
307 | #endif | |
308 | static uint64_t xcr0; | |
309 | uint64_t xcr0_features_bits; | |
310 | ||
311 | /* GNU/Linux LWP ID's are process ID's. */ | |
312 | tid = ptid_get_lwp (inferior_ptid); | |
313 | if (tid == 0) | |
314 | tid = ptid_get_pid (inferior_ptid); /* Not a threaded program. */ | |
315 | ||
316 | #ifdef __x86_64__ | |
317 | { | |
318 | unsigned long cs; | |
319 | unsigned long ds; | |
320 | ||
321 | /* Get CS register. */ | |
322 | errno = 0; | |
323 | cs = ptrace (PTRACE_PEEKUSER, tid, | |
324 | offsetof (struct user_regs_struct, cs), 0); | |
325 | if (errno != 0) | |
326 | perror_with_name (_("Couldn't get CS register")); | |
327 | ||
328 | is_64bit = cs == AMD64_LINUX_USER64_CS; | |
329 | ||
330 | /* Get DS register. */ | |
331 | errno = 0; | |
332 | ds = ptrace (PTRACE_PEEKUSER, tid, | |
333 | offsetof (struct user_regs_struct, ds), 0); | |
334 | if (errno != 0) | |
335 | perror_with_name (_("Couldn't get DS register")); | |
336 | ||
337 | is_x32 = ds == AMD64_LINUX_X32_DS; | |
338 | ||
339 | if (sizeof (void *) == 4 && is_64bit && !is_x32) | |
340 | error (_("Can't debug 64-bit process with 32-bit GDB")); | |
341 | } | |
342 | #elif HAVE_PTRACE_GETFPXREGS | |
343 | if (have_ptrace_getfpxregs == -1) | |
344 | { | |
345 | elf_fpxregset_t fpxregs; | |
346 | ||
347 | if (ptrace (PTRACE_GETFPXREGS, tid, 0, (int) &fpxregs) < 0) | |
348 | { | |
349 | have_ptrace_getfpxregs = 0; | |
350 | have_ptrace_getregset = 0; | |
351 | return tdesc_i386_mmx_linux; | |
352 | } | |
353 | } | |
354 | #endif | |
355 | ||
356 | if (have_ptrace_getregset == -1) | |
357 | { | |
df7e5265 | 358 | uint64_t xstateregs[(X86_XSTATE_SSE_SIZE / sizeof (uint64_t))]; |
040baaf6 GB |
359 | struct iovec iov; |
360 | ||
361 | iov.iov_base = xstateregs; | |
362 | iov.iov_len = sizeof (xstateregs); | |
363 | ||
364 | /* Check if PTRACE_GETREGSET works. */ | |
365 | if (ptrace (PTRACE_GETREGSET, tid, | |
366 | (unsigned int) NT_X86_XSTATE, &iov) < 0) | |
367 | have_ptrace_getregset = 0; | |
368 | else | |
369 | { | |
370 | have_ptrace_getregset = 1; | |
371 | ||
372 | /* Get XCR0 from XSAVE extended state. */ | |
373 | xcr0 = xstateregs[(I386_LINUX_XSAVE_XCR0_OFFSET | |
374 | / sizeof (uint64_t))]; | |
375 | } | |
376 | } | |
377 | ||
378 | /* Check the native XCR0 only if PTRACE_GETREGSET is available. If | |
379 | PTRACE_GETREGSET is not available then set xcr0_features_bits to | |
380 | zero so that the "no-features" descriptions are returned by the | |
381 | switches below. */ | |
382 | if (have_ptrace_getregset) | |
df7e5265 | 383 | xcr0_features_bits = xcr0 & X86_XSTATE_ALL_MASK; |
040baaf6 GB |
384 | else |
385 | xcr0_features_bits = 0; | |
386 | ||
387 | if (is_64bit) | |
388 | { | |
389 | #ifdef __x86_64__ | |
390 | switch (xcr0_features_bits) | |
391 | { | |
df7e5265 GB |
392 | case X86_XSTATE_MPX_AVX512_MASK: |
393 | case X86_XSTATE_AVX512_MASK: | |
040baaf6 GB |
394 | if (is_x32) |
395 | return tdesc_x32_avx512_linux; | |
396 | else | |
397 | return tdesc_amd64_avx512_linux; | |
df7e5265 | 398 | case X86_XSTATE_MPX_MASK: |
040baaf6 GB |
399 | if (is_x32) |
400 | return tdesc_x32_avx_linux; /* No MPX on x32 using AVX. */ | |
401 | else | |
402 | return tdesc_amd64_mpx_linux; | |
df7e5265 | 403 | case X86_XSTATE_AVX_MASK: |
040baaf6 GB |
404 | if (is_x32) |
405 | return tdesc_x32_avx_linux; | |
406 | else | |
407 | return tdesc_amd64_avx_linux; | |
408 | default: | |
409 | if (is_x32) | |
410 | return tdesc_x32_linux; | |
411 | else | |
412 | return tdesc_amd64_linux; | |
413 | } | |
414 | #endif | |
415 | } | |
416 | else | |
417 | { | |
418 | switch (xcr0_features_bits) | |
419 | { | |
df7e5265 GB |
420 | case X86_XSTATE_MPX_AVX512_MASK: |
421 | case X86_XSTATE_AVX512_MASK: | |
040baaf6 | 422 | return tdesc_i386_avx512_linux; |
df7e5265 | 423 | case X86_XSTATE_MPX_MASK: |
040baaf6 | 424 | return tdesc_i386_mpx_linux; |
df7e5265 | 425 | case X86_XSTATE_AVX_MASK: |
040baaf6 GB |
426 | return tdesc_i386_avx_linux; |
427 | default: | |
428 | return tdesc_i386_linux; | |
429 | } | |
430 | } | |
431 | ||
432 | gdb_assert_not_reached ("failed to return tdesc"); | |
433 | } | |
434 | \f | |
435 | ||
436 | /* Enable branch tracing. */ | |
437 | ||
438 | static struct btrace_target_info * | |
f4abbc16 MM |
439 | x86_linux_enable_btrace (struct target_ops *self, ptid_t ptid, |
440 | const struct btrace_config *conf) | |
040baaf6 GB |
441 | { |
442 | struct btrace_target_info *tinfo; | |
443 | struct gdbarch *gdbarch; | |
444 | ||
445 | errno = 0; | |
f4abbc16 | 446 | tinfo = linux_enable_btrace (ptid, conf); |
040baaf6 GB |
447 | |
448 | if (tinfo == NULL) | |
449 | error (_("Could not enable branch tracing for %s: %s."), | |
450 | target_pid_to_str (ptid), safe_strerror (errno)); | |
451 | ||
452 | /* Fill in the size of a pointer in bits. */ | |
453 | gdbarch = target_thread_architecture (ptid); | |
454 | tinfo->ptr_bits = gdbarch_ptr_bit (gdbarch); | |
455 | ||
456 | return tinfo; | |
457 | } | |
458 | ||
459 | /* Disable branch tracing. */ | |
460 | ||
461 | static void | |
462 | x86_linux_disable_btrace (struct target_ops *self, | |
463 | struct btrace_target_info *tinfo) | |
464 | { | |
465 | enum btrace_error errcode = linux_disable_btrace (tinfo); | |
466 | ||
467 | if (errcode != BTRACE_ERR_NONE) | |
468 | error (_("Could not disable branch tracing.")); | |
469 | } | |
470 | ||
471 | /* Teardown branch tracing. */ | |
472 | ||
473 | static void | |
474 | x86_linux_teardown_btrace (struct target_ops *self, | |
475 | struct btrace_target_info *tinfo) | |
476 | { | |
477 | /* Ignore errors. */ | |
478 | linux_disable_btrace (tinfo); | |
479 | } | |
480 | ||
481 | static enum btrace_error | |
482 | x86_linux_read_btrace (struct target_ops *self, | |
734b0e4b | 483 | struct btrace_data *data, |
040baaf6 GB |
484 | struct btrace_target_info *btinfo, |
485 | enum btrace_read_type type) | |
486 | { | |
487 | return linux_read_btrace (data, btinfo, type); | |
488 | } | |
f4abbc16 MM |
489 | |
490 | /* See to_btrace_conf in target.h. */ | |
491 | ||
492 | static const struct btrace_config * | |
493 | x86_linux_btrace_conf (struct target_ops *self, | |
494 | const struct btrace_target_info *btinfo) | |
495 | { | |
496 | return linux_btrace_conf (btinfo); | |
497 | } | |
498 | ||
040baaf6 GB |
499 | \f |
500 | ||
501 | /* Helper for ps_get_thread_area. Sets BASE_ADDR to a pointer to | |
502 | the thread local storage (or its descriptor) and returns PS_OK | |
503 | on success. Returns PS_ERR on failure. */ | |
504 | ||
505 | ps_err_e | |
506 | x86_linux_get_thread_area (pid_t pid, void *addr, unsigned int *base_addr) | |
507 | { | |
508 | /* NOTE: cagney/2003-08-26: The definition of this buffer is found | |
509 | in the kernel header <asm-i386/ldt.h>. It, after padding, is 4 x | |
510 | 4 byte integers in size: `entry_number', `base_addr', `limit', | |
511 | and a bunch of status bits. | |
512 | ||
513 | The values returned by this ptrace call should be part of the | |
514 | regcache buffer, and ps_get_thread_area should channel its | |
515 | request through the regcache. That way remote targets could | |
516 | provide the value using the remote protocol and not this direct | |
517 | call. | |
518 | ||
519 | Is this function needed? I'm guessing that the `base' is the | |
520 | address of a descriptor that libthread_db uses to find the | |
521 | thread local address base that GDB needs. Perhaps that | |
522 | descriptor is defined by the ABI. Anyway, given that | |
523 | libthread_db calls this function without prompting (gdb | |
524 | requesting tls base) I guess it needs info in there anyway. */ | |
525 | unsigned int desc[4]; | |
526 | ||
527 | /* This code assumes that "int" is 32 bits and that | |
528 | GET_THREAD_AREA returns no more than 4 int values. */ | |
529 | gdb_assert (sizeof (int) == 4); | |
530 | ||
531 | #ifndef PTRACE_GET_THREAD_AREA | |
532 | #define PTRACE_GET_THREAD_AREA 25 | |
533 | #endif | |
534 | ||
535 | if (ptrace (PTRACE_GET_THREAD_AREA, pid, addr, &desc) < 0) | |
536 | return PS_ERR; | |
537 | ||
538 | *base_addr = desc[1]; | |
539 | return PS_OK; | |
540 | } | |
541 | \f | |
542 | ||
543 | /* Create an x86 GNU/Linux target. */ | |
544 | ||
545 | struct target_ops * | |
546 | x86_linux_create_target (void) | |
547 | { | |
548 | /* Fill in the generic GNU/Linux methods. */ | |
549 | struct target_ops *t = linux_target (); | |
550 | ||
551 | /* Initialize the debug register function vectors. */ | |
df7e5265 GB |
552 | x86_use_watchpoints (t); |
553 | x86_dr_low.set_control = x86_linux_dr_set_control; | |
554 | x86_dr_low.set_addr = x86_linux_dr_set_addr; | |
555 | x86_dr_low.get_addr = x86_linux_dr_get_addr; | |
556 | x86_dr_low.get_status = x86_linux_dr_get_status; | |
557 | x86_dr_low.get_control = x86_linux_dr_get_control; | |
558 | x86_set_debug_register_length (sizeof (void *)); | |
040baaf6 GB |
559 | |
560 | /* Override the GNU/Linux inferior startup hook. */ | |
561 | super_post_startup_inferior = t->to_post_startup_inferior; | |
562 | t->to_post_startup_inferior = x86_linux_child_post_startup_inferior; | |
563 | ||
564 | /* Add the description reader. */ | |
565 | t->to_read_description = x86_linux_read_description; | |
566 | ||
567 | /* Add btrace methods. */ | |
568 | t->to_supports_btrace = linux_supports_btrace; | |
569 | t->to_enable_btrace = x86_linux_enable_btrace; | |
570 | t->to_disable_btrace = x86_linux_disable_btrace; | |
571 | t->to_teardown_btrace = x86_linux_teardown_btrace; | |
572 | t->to_read_btrace = x86_linux_read_btrace; | |
f4abbc16 | 573 | t->to_btrace_conf = x86_linux_btrace_conf; |
040baaf6 GB |
574 | |
575 | return t; | |
576 | } | |
577 | ||
578 | /* Add an x86 GNU/Linux target. */ | |
579 | ||
580 | void | |
581 | x86_linux_add_target (struct target_ops *t) | |
582 | { | |
583 | linux_nat_add_target (t); | |
584 | linux_nat_set_new_thread (t, x86_linux_new_thread); | |
585 | linux_nat_set_new_fork (t, x86_linux_new_fork); | |
df7e5265 | 586 | linux_nat_set_forget_process (t, x86_forget_process); |
040baaf6 GB |
587 | linux_nat_set_prepare_to_resume (t, x86_linux_prepare_to_resume); |
588 | } |