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9d19df75 MS |
1 | /* Native-dependent code for GNU/Linux AArch64. |
2 | ||
32d0add0 | 3 | Copyright (C) 2011-2015 Free Software Foundation, Inc. |
9d19df75 MS |
4 | Contributed by ARM Ltd. |
5 | ||
6 | This file is part of GDB. | |
7 | ||
8 | This program is free software; you can redistribute it and/or modify | |
9 | it under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 3 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | This program is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
20 | ||
21 | #include "defs.h" | |
22 | ||
23 | #include "inferior.h" | |
24 | #include "gdbcore.h" | |
25 | #include "regcache.h" | |
26 | #include "linux-nat.h" | |
27 | #include "target-descriptions.h" | |
28 | #include "auxv.h" | |
29 | #include "gdbcmd.h" | |
30 | #include "aarch64-tdep.h" | |
31 | #include "aarch64-linux-tdep.h" | |
607685ec YQ |
32 | #include "aarch32-linux-nat.h" |
33 | ||
34 | #include "elf/external.h" | |
9d19df75 MS |
35 | #include "elf/common.h" |
36 | ||
37 | #include <sys/ptrace.h> | |
38 | #include <sys/utsname.h> | |
036cd381 | 39 | #include <asm/ptrace.h> |
9d19df75 MS |
40 | |
41 | #include "gregset.h" | |
42 | ||
9d19df75 MS |
43 | /* Defines ps_err_e, struct ps_prochandle. */ |
44 | #include "gdb_proc_service.h" | |
45 | ||
46 | #ifndef TRAP_HWBKPT | |
47 | #define TRAP_HWBKPT 0x0004 | |
48 | #endif | |
49 | ||
50 | /* On GNU/Linux, threads are implemented as pseudo-processes, in which | |
51 | case we may be tracing more than one process at a time. In that | |
52 | case, inferior_ptid will contain the main process ID and the | |
53 | individual thread (process) ID. get_thread_id () is used to get | |
54 | the thread id if it's available, and the process id otherwise. */ | |
55 | ||
56 | static int | |
57 | get_thread_id (ptid_t ptid) | |
58 | { | |
dfd4cc63 | 59 | int tid = ptid_get_lwp (ptid); |
9d19df75 MS |
60 | |
61 | if (0 == tid) | |
dfd4cc63 | 62 | tid = ptid_get_pid (ptid); |
9d19df75 MS |
63 | return tid; |
64 | } | |
65 | ||
66 | /* Macro definitions, data structures, and code for the hardware | |
67 | breakpoint and hardware watchpoint support follow. We use the | |
68 | following abbreviations throughout the code: | |
69 | ||
70 | hw - hardware | |
71 | bp - breakpoint | |
72 | wp - watchpoint */ | |
73 | ||
74 | /* Maximum number of hardware breakpoint and watchpoint registers. | |
75 | Neither of these values may exceed the width of dr_changed_t | |
76 | measured in bits. */ | |
77 | ||
78 | #define AARCH64_HBP_MAX_NUM 16 | |
79 | #define AARCH64_HWP_MAX_NUM 16 | |
80 | ||
81 | /* Alignment requirement in bytes for addresses written to | |
82 | hardware breakpoint and watchpoint value registers. | |
83 | ||
84 | A ptrace call attempting to set an address that does not meet the | |
85 | alignment criteria will fail. Limited support has been provided in | |
86 | this port for unaligned watchpoints, such that from a GDB user | |
87 | perspective, an unaligned watchpoint may be requested. | |
88 | ||
89 | This is achieved by minimally enlarging the watched area to meet the | |
90 | alignment requirement, and if necessary, splitting the watchpoint | |
91 | over several hardware watchpoint registers. */ | |
92 | ||
93 | #define AARCH64_HBP_ALIGNMENT 4 | |
94 | #define AARCH64_HWP_ALIGNMENT 8 | |
95 | ||
96 | /* The maximum length of a memory region that can be watched by one | |
97 | hardware watchpoint register. */ | |
98 | ||
99 | #define AARCH64_HWP_MAX_LEN_PER_REG 8 | |
100 | ||
101 | /* ptrace hardware breakpoint resource info is formatted as follows: | |
102 | ||
103 | 31 24 16 8 0 | |
104 | +---------------+--------------+---------------+---------------+ | |
105 | | RESERVED | RESERVED | DEBUG_ARCH | NUM_SLOTS | | |
106 | +---------------+--------------+---------------+---------------+ */ | |
107 | ||
108 | ||
109 | /* Macros to extract fields from the hardware debug information word. */ | |
110 | #define AARCH64_DEBUG_NUM_SLOTS(x) ((x) & 0xff) | |
111 | #define AARCH64_DEBUG_ARCH(x) (((x) >> 8) & 0xff) | |
112 | ||
113 | /* Macro for the expected version of the ARMv8-A debug architecture. */ | |
114 | #define AARCH64_DEBUG_ARCH_V8 0x6 | |
115 | ||
116 | /* Number of hardware breakpoints/watchpoints the target supports. | |
117 | They are initialized with values obtained via the ptrace calls | |
118 | with NT_ARM_HW_BREAK and NT_ARM_HW_WATCH respectively. */ | |
119 | ||
120 | static int aarch64_num_bp_regs; | |
121 | static int aarch64_num_wp_regs; | |
122 | ||
9d19df75 MS |
123 | /* Each bit of a variable of this type is used to indicate whether a |
124 | hardware breakpoint or watchpoint setting has been changed since | |
125 | the last update. | |
126 | ||
127 | Bit N corresponds to the Nth hardware breakpoint or watchpoint | |
128 | setting which is managed in aarch64_debug_reg_state, where N is | |
129 | valid between 0 and the total number of the hardware breakpoint or | |
130 | watchpoint debug registers minus 1. | |
131 | ||
132 | When bit N is 1, the corresponding breakpoint or watchpoint setting | |
133 | has changed, and therefore the corresponding hardware debug | |
134 | register needs to be updated via the ptrace interface. | |
135 | ||
136 | In the per-thread arch-specific data area, we define two such | |
137 | variables for per-thread hardware breakpoint and watchpoint | |
138 | settings respectively. | |
139 | ||
140 | This type is part of the mechanism which helps reduce the number of | |
141 | ptrace calls to the kernel, i.e. avoid asking the kernel to write | |
142 | to the debug registers with unchanged values. */ | |
143 | ||
de589d04 | 144 | typedef ULONGEST dr_changed_t; |
9d19df75 MS |
145 | |
146 | /* Set each of the lower M bits of X to 1; assert X is wide enough. */ | |
147 | ||
148 | #define DR_MARK_ALL_CHANGED(x, m) \ | |
149 | do \ | |
150 | { \ | |
151 | gdb_assert (sizeof ((x)) * 8 >= (m)); \ | |
152 | (x) = (((dr_changed_t)1 << (m)) - 1); \ | |
153 | } while (0) | |
154 | ||
155 | #define DR_MARK_N_CHANGED(x, n) \ | |
156 | do \ | |
157 | { \ | |
158 | (x) |= ((dr_changed_t)1 << (n)); \ | |
159 | } while (0) | |
160 | ||
161 | #define DR_CLEAR_CHANGED(x) \ | |
162 | do \ | |
163 | { \ | |
164 | (x) = 0; \ | |
165 | } while (0) | |
166 | ||
167 | #define DR_HAS_CHANGED(x) ((x) != 0) | |
168 | #define DR_N_HAS_CHANGED(x, n) ((x) & ((dr_changed_t)1 << (n))) | |
169 | ||
170 | /* Structure for managing the hardware breakpoint/watchpoint resources. | |
171 | DR_ADDR_* stores the address, DR_CTRL_* stores the control register | |
172 | content, and DR_REF_COUNT_* counts the numbers of references to the | |
173 | corresponding bp/wp, by which way the limited hardware resources | |
174 | are not wasted on duplicated bp/wp settings (though so far gdb has | |
175 | done a good job by not sending duplicated bp/wp requests). */ | |
176 | ||
177 | struct aarch64_debug_reg_state | |
178 | { | |
179 | /* hardware breakpoint */ | |
180 | CORE_ADDR dr_addr_bp[AARCH64_HBP_MAX_NUM]; | |
181 | unsigned int dr_ctrl_bp[AARCH64_HBP_MAX_NUM]; | |
182 | unsigned int dr_ref_count_bp[AARCH64_HBP_MAX_NUM]; | |
183 | ||
184 | /* hardware watchpoint */ | |
185 | CORE_ADDR dr_addr_wp[AARCH64_HWP_MAX_NUM]; | |
186 | unsigned int dr_ctrl_wp[AARCH64_HWP_MAX_NUM]; | |
187 | unsigned int dr_ref_count_wp[AARCH64_HWP_MAX_NUM]; | |
188 | }; | |
189 | ||
d6c44983 YZ |
190 | /* Per-process data. We don't bind this to a per-inferior registry |
191 | because of targets like x86 GNU/Linux that need to keep track of | |
192 | processes that aren't bound to any inferior (e.g., fork children, | |
193 | checkpoints). */ | |
9d19df75 | 194 | |
d6c44983 | 195 | struct aarch64_process_info |
9d19df75 | 196 | { |
d6c44983 YZ |
197 | /* Linked list. */ |
198 | struct aarch64_process_info *next; | |
9d19df75 | 199 | |
d6c44983 YZ |
200 | /* The process identifier. */ |
201 | pid_t pid; | |
9d19df75 | 202 | |
d6c44983 YZ |
203 | /* Copy of aarch64 hardware debug registers. */ |
204 | struct aarch64_debug_reg_state state; | |
205 | }; | |
206 | ||
207 | static struct aarch64_process_info *aarch64_process_list = NULL; | |
208 | ||
209 | /* Find process data for process PID. */ | |
210 | ||
211 | static struct aarch64_process_info * | |
212 | aarch64_find_process_pid (pid_t pid) | |
213 | { | |
214 | struct aarch64_process_info *proc; | |
215 | ||
216 | for (proc = aarch64_process_list; proc; proc = proc->next) | |
217 | if (proc->pid == pid) | |
218 | return proc; | |
219 | ||
220 | return NULL; | |
9d19df75 MS |
221 | } |
222 | ||
d6c44983 YZ |
223 | /* Add process data for process PID. Returns newly allocated info |
224 | object. */ | |
9d19df75 | 225 | |
d6c44983 YZ |
226 | static struct aarch64_process_info * |
227 | aarch64_add_process (pid_t pid) | |
9d19df75 | 228 | { |
d6c44983 | 229 | struct aarch64_process_info *proc; |
9d19df75 | 230 | |
d6c44983 YZ |
231 | proc = xcalloc (1, sizeof (*proc)); |
232 | proc->pid = pid; | |
9d19df75 | 233 | |
d6c44983 YZ |
234 | proc->next = aarch64_process_list; |
235 | aarch64_process_list = proc; | |
236 | ||
237 | return proc; | |
238 | } | |
239 | ||
240 | /* Get data specific info for process PID, creating it if necessary. | |
241 | Never returns NULL. */ | |
242 | ||
243 | static struct aarch64_process_info * | |
244 | aarch64_process_info_get (pid_t pid) | |
9d19df75 | 245 | { |
d6c44983 YZ |
246 | struct aarch64_process_info *proc; |
247 | ||
248 | proc = aarch64_find_process_pid (pid); | |
249 | if (proc == NULL) | |
250 | proc = aarch64_add_process (pid); | |
9d19df75 | 251 | |
d6c44983 | 252 | return proc; |
9d19df75 MS |
253 | } |
254 | ||
d6c44983 YZ |
255 | /* Called whenever GDB is no longer debugging process PID. It deletes |
256 | data structures that keep track of debug register state. */ | |
9d19df75 | 257 | |
d6c44983 YZ |
258 | static void |
259 | aarch64_forget_process (pid_t pid) | |
9d19df75 | 260 | { |
d6c44983 | 261 | struct aarch64_process_info *proc, **proc_link; |
9d19df75 | 262 | |
d6c44983 YZ |
263 | proc = aarch64_process_list; |
264 | proc_link = &aarch64_process_list; | |
265 | ||
266 | while (proc != NULL) | |
9d19df75 | 267 | { |
d6c44983 YZ |
268 | if (proc->pid == pid) |
269 | { | |
270 | *proc_link = proc->next; | |
9d19df75 | 271 | |
d6c44983 YZ |
272 | xfree (proc); |
273 | return; | |
274 | } | |
275 | ||
276 | proc_link = &proc->next; | |
277 | proc = *proc_link; | |
278 | } | |
9d19df75 MS |
279 | } |
280 | ||
d6c44983 | 281 | /* Get debug registers state for process PID. */ |
9d19df75 MS |
282 | |
283 | static struct aarch64_debug_reg_state * | |
d6c44983 | 284 | aarch64_get_debug_reg_state (pid_t pid) |
9d19df75 | 285 | { |
d6c44983 | 286 | return &aarch64_process_info_get (pid)->state; |
9d19df75 MS |
287 | } |
288 | ||
289 | /* Per-thread arch-specific data we want to keep. */ | |
290 | ||
291 | struct arch_lwp_info | |
292 | { | |
293 | /* When bit N is 1, it indicates the Nth hardware breakpoint or | |
294 | watchpoint register pair needs to be updated when the thread is | |
295 | resumed; see aarch64_linux_prepare_to_resume. */ | |
296 | dr_changed_t dr_changed_bp; | |
297 | dr_changed_t dr_changed_wp; | |
298 | }; | |
299 | ||
300 | /* Call ptrace to set the thread TID's hardware breakpoint/watchpoint | |
301 | registers with data from *STATE. */ | |
302 | ||
303 | static void | |
304 | aarch64_linux_set_debug_regs (const struct aarch64_debug_reg_state *state, | |
305 | int tid, int watchpoint) | |
306 | { | |
307 | int i, count; | |
308 | struct iovec iov; | |
309 | struct user_hwdebug_state regs; | |
310 | const CORE_ADDR *addr; | |
311 | const unsigned int *ctrl; | |
312 | ||
1aa4cd77 | 313 | memset (®s, 0, sizeof (regs)); |
9d19df75 | 314 | iov.iov_base = ®s; |
9d19df75 MS |
315 | count = watchpoint ? aarch64_num_wp_regs : aarch64_num_bp_regs; |
316 | addr = watchpoint ? state->dr_addr_wp : state->dr_addr_bp; | |
317 | ctrl = watchpoint ? state->dr_ctrl_wp : state->dr_ctrl_bp; | |
f45c82da YZ |
318 | if (count == 0) |
319 | return; | |
320 | iov.iov_len = (offsetof (struct user_hwdebug_state, dbg_regs[count - 1]) | |
321 | + sizeof (regs.dbg_regs [count - 1])); | |
9d19df75 MS |
322 | |
323 | for (i = 0; i < count; i++) | |
324 | { | |
325 | regs.dbg_regs[i].addr = addr[i]; | |
326 | regs.dbg_regs[i].ctrl = ctrl[i]; | |
327 | } | |
328 | ||
329 | if (ptrace (PTRACE_SETREGSET, tid, | |
330 | watchpoint ? NT_ARM_HW_WATCH : NT_ARM_HW_BREAK, | |
331 | (void *) &iov)) | |
332 | error (_("Unexpected error setting hardware debug registers")); | |
333 | } | |
334 | ||
335 | struct aarch64_dr_update_callback_param | |
336 | { | |
337 | int is_watchpoint; | |
338 | unsigned int idx; | |
339 | }; | |
340 | ||
d6c44983 | 341 | /* Callback for iterate_over_lwps. Records the |
9d19df75 MS |
342 | information about the change of one hardware breakpoint/watchpoint |
343 | setting for the thread LWP. | |
344 | The information is passed in via PTR. | |
345 | N.B. The actual updating of hardware debug registers is not | |
346 | carried out until the moment the thread is resumed. */ | |
347 | ||
348 | static int | |
349 | debug_reg_change_callback (struct lwp_info *lwp, void *ptr) | |
350 | { | |
351 | struct aarch64_dr_update_callback_param *param_p | |
352 | = (struct aarch64_dr_update_callback_param *) ptr; | |
353 | int pid = get_thread_id (lwp->ptid); | |
354 | int idx = param_p->idx; | |
355 | int is_watchpoint = param_p->is_watchpoint; | |
356 | struct arch_lwp_info *info = lwp->arch_private; | |
357 | dr_changed_t *dr_changed_ptr; | |
358 | dr_changed_t dr_changed; | |
359 | ||
360 | if (info == NULL) | |
361 | info = lwp->arch_private = XCNEW (struct arch_lwp_info); | |
362 | ||
c5e92cca | 363 | if (show_debug_regs) |
9d19df75 MS |
364 | { |
365 | fprintf_unfiltered (gdb_stdlog, | |
366 | "debug_reg_change_callback: \n\tOn entry:\n"); | |
367 | fprintf_unfiltered (gdb_stdlog, | |
1d3ffd6b MS |
368 | "\tpid%d, dr_changed_bp=0x%s, " |
369 | "dr_changed_wp=0x%s\n", | |
370 | pid, phex (info->dr_changed_bp, 8), | |
371 | phex (info->dr_changed_wp, 8)); | |
9d19df75 MS |
372 | } |
373 | ||
374 | dr_changed_ptr = is_watchpoint ? &info->dr_changed_wp | |
375 | : &info->dr_changed_bp; | |
376 | dr_changed = *dr_changed_ptr; | |
377 | ||
378 | gdb_assert (idx >= 0 | |
379 | && (idx <= (is_watchpoint ? aarch64_num_wp_regs | |
380 | : aarch64_num_bp_regs))); | |
381 | ||
382 | /* The actual update is done later just before resuming the lwp, | |
383 | we just mark that one register pair needs updating. */ | |
384 | DR_MARK_N_CHANGED (dr_changed, idx); | |
385 | *dr_changed_ptr = dr_changed; | |
386 | ||
387 | /* If the lwp isn't stopped, force it to momentarily pause, so | |
388 | we can update its debug registers. */ | |
389 | if (!lwp->stopped) | |
390 | linux_stop_lwp (lwp); | |
391 | ||
c5e92cca | 392 | if (show_debug_regs) |
9d19df75 MS |
393 | { |
394 | fprintf_unfiltered (gdb_stdlog, | |
1d3ffd6b MS |
395 | "\tOn exit:\n\tpid%d, dr_changed_bp=0x%s, " |
396 | "dr_changed_wp=0x%s\n", | |
397 | pid, phex (info->dr_changed_bp, 8), | |
398 | phex (info->dr_changed_wp, 8)); | |
9d19df75 MS |
399 | } |
400 | ||
401 | /* Continue the iteration. */ | |
402 | return 0; | |
403 | } | |
404 | ||
405 | /* Notify each thread that their IDXth breakpoint/watchpoint register | |
406 | pair needs to be updated. The message will be recorded in each | |
407 | thread's arch-specific data area, the actual updating will be done | |
408 | when the thread is resumed. */ | |
409 | ||
410 | static void | |
411 | aarch64_notify_debug_reg_change (const struct aarch64_debug_reg_state *state, | |
412 | int is_watchpoint, unsigned int idx) | |
413 | { | |
414 | struct aarch64_dr_update_callback_param param; | |
d6c44983 | 415 | ptid_t pid_ptid = pid_to_ptid (ptid_get_pid (inferior_ptid)); |
9d19df75 MS |
416 | |
417 | param.is_watchpoint = is_watchpoint; | |
418 | param.idx = idx; | |
419 | ||
d6c44983 | 420 | iterate_over_lwps (pid_ptid, debug_reg_change_callback, (void *) ¶m); |
9d19df75 MS |
421 | } |
422 | ||
423 | /* Print the values of the cached breakpoint/watchpoint registers. */ | |
424 | ||
425 | static void | |
426 | aarch64_show_debug_reg_state (struct aarch64_debug_reg_state *state, | |
427 | const char *func, CORE_ADDR addr, | |
428 | int len, int type) | |
429 | { | |
430 | int i; | |
431 | ||
432 | fprintf_unfiltered (gdb_stdlog, "%s", func); | |
433 | if (addr || len) | |
434 | fprintf_unfiltered (gdb_stdlog, " (addr=0x%08lx, len=%d, type=%s)", | |
435 | (unsigned long) addr, len, | |
436 | type == hw_write ? "hw-write-watchpoint" | |
437 | : (type == hw_read ? "hw-read-watchpoint" | |
438 | : (type == hw_access ? "hw-access-watchpoint" | |
439 | : (type == hw_execute ? "hw-breakpoint" | |
440 | : "??unknown??")))); | |
441 | fprintf_unfiltered (gdb_stdlog, ":\n"); | |
442 | ||
443 | fprintf_unfiltered (gdb_stdlog, "\tBREAKPOINTs:\n"); | |
444 | for (i = 0; i < aarch64_num_bp_regs; i++) | |
445 | fprintf_unfiltered (gdb_stdlog, | |
446 | "\tBP%d: addr=0x%08lx, ctrl=0x%08x, ref.count=%d\n", | |
447 | i, state->dr_addr_bp[i], | |
448 | state->dr_ctrl_bp[i], state->dr_ref_count_bp[i]); | |
449 | ||
450 | fprintf_unfiltered (gdb_stdlog, "\tWATCHPOINTs:\n"); | |
451 | for (i = 0; i < aarch64_num_wp_regs; i++) | |
452 | fprintf_unfiltered (gdb_stdlog, | |
453 | "\tWP%d: addr=0x%08lx, ctrl=0x%08x, ref.count=%d\n", | |
454 | i, state->dr_addr_wp[i], | |
455 | state->dr_ctrl_wp[i], state->dr_ref_count_wp[i]); | |
456 | } | |
457 | ||
458 | /* Fill GDB's register array with the general-purpose register values | |
459 | from the current thread. */ | |
460 | ||
461 | static void | |
462 | fetch_gregs_from_thread (struct regcache *regcache) | |
463 | { | |
607685ec YQ |
464 | int ret, tid; |
465 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
9d19df75 MS |
466 | elf_gregset_t regs; |
467 | struct iovec iovec; | |
468 | ||
607685ec YQ |
469 | /* Make sure REGS can hold all registers contents on both aarch64 |
470 | and arm. */ | |
471 | gdb_static_assert (sizeof (regs) >= 18 * 4); | |
472 | ||
9d19df75 MS |
473 | tid = get_thread_id (inferior_ptid); |
474 | ||
475 | iovec.iov_base = ®s; | |
607685ec YQ |
476 | if (gdbarch_bfd_arch_info (gdbarch)->bits_per_word == 32) |
477 | iovec.iov_len = 18 * 4; | |
478 | else | |
479 | iovec.iov_len = sizeof (regs); | |
9d19df75 MS |
480 | |
481 | ret = ptrace (PTRACE_GETREGSET, tid, NT_PRSTATUS, &iovec); | |
482 | if (ret < 0) | |
483 | perror_with_name (_("Unable to fetch general registers.")); | |
484 | ||
607685ec YQ |
485 | if (gdbarch_bfd_arch_info (gdbarch)->bits_per_word == 32) |
486 | aarch32_gp_regcache_supply (regcache, (uint32_t *) regs, 1); | |
487 | else | |
488 | { | |
489 | int regno; | |
490 | ||
491 | for (regno = AARCH64_X0_REGNUM; regno <= AARCH64_CPSR_REGNUM; regno++) | |
492 | regcache_raw_supply (regcache, regno, ®s[regno - AARCH64_X0_REGNUM]); | |
493 | } | |
9d19df75 MS |
494 | } |
495 | ||
496 | /* Store to the current thread the valid general-purpose register | |
497 | values in the GDB's register array. */ | |
498 | ||
499 | static void | |
500 | store_gregs_to_thread (const struct regcache *regcache) | |
501 | { | |
607685ec | 502 | int ret, tid; |
9d19df75 MS |
503 | elf_gregset_t regs; |
504 | struct iovec iovec; | |
607685ec | 505 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
9d19df75 | 506 | |
607685ec YQ |
507 | /* Make sure REGS can hold all registers contents on both aarch64 |
508 | and arm. */ | |
509 | gdb_static_assert (sizeof (regs) >= 18 * 4); | |
9d19df75 MS |
510 | tid = get_thread_id (inferior_ptid); |
511 | ||
512 | iovec.iov_base = ®s; | |
607685ec YQ |
513 | if (gdbarch_bfd_arch_info (gdbarch)->bits_per_word == 32) |
514 | iovec.iov_len = 18 * 4; | |
515 | else | |
516 | iovec.iov_len = sizeof (regs); | |
9d19df75 MS |
517 | |
518 | ret = ptrace (PTRACE_GETREGSET, tid, NT_PRSTATUS, &iovec); | |
519 | if (ret < 0) | |
520 | perror_with_name (_("Unable to fetch general registers.")); | |
521 | ||
607685ec YQ |
522 | if (gdbarch_bfd_arch_info (gdbarch)->bits_per_word == 32) |
523 | aarch32_gp_regcache_collect (regcache, (uint32_t *) regs, 1); | |
524 | else | |
525 | { | |
526 | int regno; | |
527 | ||
528 | for (regno = AARCH64_X0_REGNUM; regno <= AARCH64_CPSR_REGNUM; regno++) | |
529 | if (REG_VALID == regcache_register_status (regcache, regno)) | |
530 | regcache_raw_collect (regcache, regno, | |
531 | ®s[regno - AARCH64_X0_REGNUM]); | |
532 | } | |
9d19df75 MS |
533 | |
534 | ret = ptrace (PTRACE_SETREGSET, tid, NT_PRSTATUS, &iovec); | |
535 | if (ret < 0) | |
536 | perror_with_name (_("Unable to store general registers.")); | |
537 | } | |
538 | ||
539 | /* Fill GDB's register array with the fp/simd register values | |
540 | from the current thread. */ | |
541 | ||
542 | static void | |
543 | fetch_fpregs_from_thread (struct regcache *regcache) | |
544 | { | |
607685ec | 545 | int ret, tid; |
9d19df75 MS |
546 | elf_fpregset_t regs; |
547 | struct iovec iovec; | |
607685ec YQ |
548 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
549 | ||
550 | /* Make sure REGS can hold all VFP registers contents on both aarch64 | |
551 | and arm. */ | |
552 | gdb_static_assert (sizeof regs >= VFP_REGS_SIZE); | |
9d19df75 MS |
553 | |
554 | tid = get_thread_id (inferior_ptid); | |
555 | ||
556 | iovec.iov_base = ®s; | |
9d19df75 | 557 | |
607685ec YQ |
558 | if (gdbarch_bfd_arch_info (gdbarch)->bits_per_word == 32) |
559 | { | |
560 | iovec.iov_len = VFP_REGS_SIZE; | |
561 | ||
562 | ret = ptrace (PTRACE_GETREGSET, tid, NT_ARM_VFP, &iovec); | |
563 | if (ret < 0) | |
564 | perror_with_name (_("Unable to fetch VFP registers.")); | |
565 | ||
566 | aarch32_vfp_regcache_supply (regcache, (gdb_byte *) ®s, 32); | |
567 | } | |
568 | else | |
569 | { | |
570 | int regno; | |
571 | ||
572 | iovec.iov_len = sizeof (regs); | |
9d19df75 | 573 | |
607685ec YQ |
574 | ret = ptrace (PTRACE_GETREGSET, tid, NT_FPREGSET, &iovec); |
575 | if (ret < 0) | |
576 | perror_with_name (_("Unable to fetch vFP/SIMD registers.")); | |
9d19df75 | 577 | |
607685ec YQ |
578 | for (regno = AARCH64_V0_REGNUM; regno <= AARCH64_V31_REGNUM; regno++) |
579 | regcache_raw_supply (regcache, regno, | |
580 | ®s.vregs[regno - AARCH64_V0_REGNUM]); | |
581 | ||
582 | regcache_raw_supply (regcache, AARCH64_FPSR_REGNUM, ®s.fpsr); | |
583 | regcache_raw_supply (regcache, AARCH64_FPCR_REGNUM, ®s.fpcr); | |
584 | } | |
9d19df75 MS |
585 | } |
586 | ||
587 | /* Store to the current thread the valid fp/simd register | |
588 | values in the GDB's register array. */ | |
589 | ||
590 | static void | |
591 | store_fpregs_to_thread (const struct regcache *regcache) | |
592 | { | |
607685ec | 593 | int ret, tid; |
9d19df75 MS |
594 | elf_fpregset_t regs; |
595 | struct iovec iovec; | |
607685ec | 596 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
9d19df75 | 597 | |
607685ec YQ |
598 | /* Make sure REGS can hold all VFP registers contents on both aarch64 |
599 | and arm. */ | |
600 | gdb_static_assert (sizeof regs >= VFP_REGS_SIZE); | |
9d19df75 MS |
601 | tid = get_thread_id (inferior_ptid); |
602 | ||
603 | iovec.iov_base = ®s; | |
9d19df75 | 604 | |
607685ec YQ |
605 | if (gdbarch_bfd_arch_info (gdbarch)->bits_per_word == 32) |
606 | { | |
607 | iovec.iov_len = VFP_REGS_SIZE; | |
9d19df75 | 608 | |
607685ec YQ |
609 | ret = ptrace (PTRACE_GETREGSET, tid, NT_ARM_VFP, &iovec); |
610 | if (ret < 0) | |
611 | perror_with_name (_("Unable to fetch VFP registers.")); | |
9d19df75 | 612 | |
607685ec YQ |
613 | aarch32_vfp_regcache_collect (regcache, (gdb_byte *) ®s, 32); |
614 | } | |
615 | else | |
616 | { | |
617 | int regno; | |
9d19df75 | 618 | |
607685ec YQ |
619 | iovec.iov_len = sizeof (regs); |
620 | ||
621 | ret = ptrace (PTRACE_GETREGSET, tid, NT_FPREGSET, &iovec); | |
622 | if (ret < 0) | |
623 | perror_with_name (_("Unable to fetch FP/SIMD registers.")); | |
624 | ||
625 | for (regno = AARCH64_V0_REGNUM; regno <= AARCH64_V31_REGNUM; regno++) | |
626 | if (REG_VALID == regcache_register_status (regcache, regno)) | |
627 | regcache_raw_collect (regcache, regno, | |
628 | (char *) ®s.vregs[regno - AARCH64_V0_REGNUM]); | |
629 | ||
630 | if (REG_VALID == regcache_register_status (regcache, AARCH64_FPSR_REGNUM)) | |
631 | regcache_raw_collect (regcache, AARCH64_FPSR_REGNUM, | |
632 | (char *) ®s.fpsr); | |
633 | if (REG_VALID == regcache_register_status (regcache, AARCH64_FPCR_REGNUM)) | |
634 | regcache_raw_collect (regcache, AARCH64_FPCR_REGNUM, | |
635 | (char *) ®s.fpcr); | |
636 | } | |
637 | ||
638 | if (gdbarch_bfd_arch_info (gdbarch)->bits_per_word == 32) | |
639 | { | |
640 | ret = ptrace (PTRACE_SETREGSET, tid, NT_ARM_VFP, &iovec); | |
641 | if (ret < 0) | |
642 | perror_with_name (_("Unable to store VFP registers.")); | |
643 | } | |
644 | else | |
645 | { | |
646 | ret = ptrace (PTRACE_SETREGSET, tid, NT_FPREGSET, &iovec); | |
647 | if (ret < 0) | |
648 | perror_with_name (_("Unable to store FP/SIMD registers.")); | |
649 | } | |
9d19df75 MS |
650 | } |
651 | ||
652 | /* Implement the "to_fetch_register" target_ops method. */ | |
653 | ||
654 | static void | |
655 | aarch64_linux_fetch_inferior_registers (struct target_ops *ops, | |
656 | struct regcache *regcache, | |
657 | int regno) | |
658 | { | |
659 | if (regno == -1) | |
660 | { | |
661 | fetch_gregs_from_thread (regcache); | |
662 | fetch_fpregs_from_thread (regcache); | |
663 | } | |
664 | else if (regno < AARCH64_V0_REGNUM) | |
665 | fetch_gregs_from_thread (regcache); | |
666 | else | |
667 | fetch_fpregs_from_thread (regcache); | |
668 | } | |
669 | ||
670 | /* Implement the "to_store_register" target_ops method. */ | |
671 | ||
672 | static void | |
673 | aarch64_linux_store_inferior_registers (struct target_ops *ops, | |
674 | struct regcache *regcache, | |
675 | int regno) | |
676 | { | |
677 | if (regno == -1) | |
678 | { | |
679 | store_gregs_to_thread (regcache); | |
680 | store_fpregs_to_thread (regcache); | |
681 | } | |
682 | else if (regno < AARCH64_V0_REGNUM) | |
683 | store_gregs_to_thread (regcache); | |
684 | else | |
685 | store_fpregs_to_thread (regcache); | |
686 | } | |
687 | ||
688 | /* Fill register REGNO (if it is a general-purpose register) in | |
689 | *GREGSETPS with the value in GDB's register array. If REGNO is -1, | |
690 | do this for all registers. */ | |
691 | ||
692 | void | |
693 | fill_gregset (const struct regcache *regcache, | |
694 | gdb_gregset_t *gregsetp, int regno) | |
695 | { | |
d4d793bf AA |
696 | regcache_collect_regset (&aarch64_linux_gregset, regcache, |
697 | regno, (gdb_byte *) gregsetp, | |
698 | AARCH64_LINUX_SIZEOF_GREGSET); | |
9d19df75 MS |
699 | } |
700 | ||
701 | /* Fill GDB's register array with the general-purpose register values | |
702 | in *GREGSETP. */ | |
703 | ||
704 | void | |
705 | supply_gregset (struct regcache *regcache, const gdb_gregset_t *gregsetp) | |
706 | { | |
d4d793bf AA |
707 | regcache_supply_regset (&aarch64_linux_gregset, regcache, -1, |
708 | (const gdb_byte *) gregsetp, | |
709 | AARCH64_LINUX_SIZEOF_GREGSET); | |
9d19df75 MS |
710 | } |
711 | ||
712 | /* Fill register REGNO (if it is a floating-point register) in | |
713 | *FPREGSETP with the value in GDB's register array. If REGNO is -1, | |
714 | do this for all registers. */ | |
715 | ||
716 | void | |
717 | fill_fpregset (const struct regcache *regcache, | |
718 | gdb_fpregset_t *fpregsetp, int regno) | |
719 | { | |
d4d793bf AA |
720 | regcache_collect_regset (&aarch64_linux_fpregset, regcache, |
721 | regno, (gdb_byte *) fpregsetp, | |
722 | AARCH64_LINUX_SIZEOF_FPREGSET); | |
9d19df75 MS |
723 | } |
724 | ||
725 | /* Fill GDB's register array with the floating-point register values | |
726 | in *FPREGSETP. */ | |
727 | ||
728 | void | |
729 | supply_fpregset (struct regcache *regcache, const gdb_fpregset_t *fpregsetp) | |
730 | { | |
d4d793bf AA |
731 | regcache_supply_regset (&aarch64_linux_fpregset, regcache, -1, |
732 | (const gdb_byte *) fpregsetp, | |
733 | AARCH64_LINUX_SIZEOF_FPREGSET); | |
9d19df75 MS |
734 | } |
735 | ||
736 | /* Called when resuming a thread. | |
737 | The hardware debug registers are updated when there is any change. */ | |
738 | ||
739 | static void | |
740 | aarch64_linux_prepare_to_resume (struct lwp_info *lwp) | |
741 | { | |
742 | struct arch_lwp_info *info = lwp->arch_private; | |
743 | ||
744 | /* NULL means this is the main thread still going through the shell, | |
745 | or, no watchpoint has been set yet. In that case, there's | |
746 | nothing to do. */ | |
747 | if (info == NULL) | |
748 | return; | |
749 | ||
750 | if (DR_HAS_CHANGED (info->dr_changed_bp) | |
751 | || DR_HAS_CHANGED (info->dr_changed_wp)) | |
752 | { | |
dfd4cc63 | 753 | int tid = ptid_get_lwp (lwp->ptid); |
d6c44983 YZ |
754 | struct aarch64_debug_reg_state *state |
755 | = aarch64_get_debug_reg_state (ptid_get_pid (lwp->ptid)); | |
9d19df75 | 756 | |
c5e92cca | 757 | if (show_debug_regs) |
9d19df75 MS |
758 | fprintf_unfiltered (gdb_stdlog, "prepare_to_resume thread %d\n", tid); |
759 | ||
760 | /* Watchpoints. */ | |
761 | if (DR_HAS_CHANGED (info->dr_changed_wp)) | |
762 | { | |
763 | aarch64_linux_set_debug_regs (state, tid, 1); | |
764 | DR_CLEAR_CHANGED (info->dr_changed_wp); | |
765 | } | |
766 | ||
767 | /* Breakpoints. */ | |
768 | if (DR_HAS_CHANGED (info->dr_changed_bp)) | |
769 | { | |
770 | aarch64_linux_set_debug_regs (state, tid, 0); | |
771 | DR_CLEAR_CHANGED (info->dr_changed_bp); | |
772 | } | |
773 | } | |
774 | } | |
775 | ||
776 | static void | |
777 | aarch64_linux_new_thread (struct lwp_info *lp) | |
778 | { | |
779 | struct arch_lwp_info *info = XCNEW (struct arch_lwp_info); | |
780 | ||
781 | /* Mark that all the hardware breakpoint/watchpoint register pairs | |
782 | for this thread need to be initialized. */ | |
783 | DR_MARK_ALL_CHANGED (info->dr_changed_bp, aarch64_num_bp_regs); | |
784 | DR_MARK_ALL_CHANGED (info->dr_changed_wp, aarch64_num_wp_regs); | |
785 | ||
786 | lp->arch_private = info; | |
787 | } | |
d6c44983 YZ |
788 | |
789 | /* linux_nat_new_fork hook. */ | |
790 | ||
791 | static void | |
792 | aarch64_linux_new_fork (struct lwp_info *parent, pid_t child_pid) | |
793 | { | |
794 | pid_t parent_pid; | |
795 | struct aarch64_debug_reg_state *parent_state; | |
796 | struct aarch64_debug_reg_state *child_state; | |
797 | ||
798 | /* NULL means no watchpoint has ever been set in the parent. In | |
799 | that case, there's nothing to do. */ | |
800 | if (parent->arch_private == NULL) | |
801 | return; | |
802 | ||
803 | /* GDB core assumes the child inherits the watchpoints/hw | |
804 | breakpoints of the parent, and will remove them all from the | |
805 | forked off process. Copy the debug registers mirrors into the | |
806 | new process so that all breakpoints and watchpoints can be | |
807 | removed together. */ | |
808 | ||
809 | parent_pid = ptid_get_pid (parent->ptid); | |
810 | parent_state = aarch64_get_debug_reg_state (parent_pid); | |
811 | child_state = aarch64_get_debug_reg_state (child_pid); | |
812 | *child_state = *parent_state; | |
813 | } | |
9d19df75 MS |
814 | \f |
815 | ||
816 | /* Called by libthread_db. Returns a pointer to the thread local | |
817 | storage (or its descriptor). */ | |
818 | ||
819 | ps_err_e | |
820 | ps_get_thread_area (const struct ps_prochandle *ph, | |
821 | lwpid_t lwpid, int idx, void **base) | |
822 | { | |
823 | struct iovec iovec; | |
824 | uint64_t reg; | |
825 | ||
826 | iovec.iov_base = ® | |
827 | iovec.iov_len = sizeof (reg); | |
828 | ||
829 | if (ptrace (PTRACE_GETREGSET, lwpid, NT_ARM_TLS, &iovec) != 0) | |
830 | return PS_ERR; | |
831 | ||
832 | /* IDX is the bias from the thread pointer to the beginning of the | |
833 | thread descriptor. It has to be subtracted due to implementation | |
834 | quirks in libthread_db. */ | |
835 | *base = (void *) (reg - idx); | |
836 | ||
837 | return PS_OK; | |
838 | } | |
839 | \f | |
840 | ||
0f4576e3 YQ |
841 | /* Get the hardware debug register capacity information from the |
842 | inferior represented by PTID. */ | |
9d19df75 MS |
843 | |
844 | static void | |
0f4576e3 | 845 | aarch64_linux_get_debug_reg_capacity (ptid_t ptid) |
9d19df75 MS |
846 | { |
847 | int tid; | |
848 | struct iovec iov; | |
849 | struct user_hwdebug_state dreg_state; | |
850 | ||
0f4576e3 | 851 | tid = get_thread_id (ptid); |
9d19df75 MS |
852 | iov.iov_base = &dreg_state; |
853 | iov.iov_len = sizeof (dreg_state); | |
854 | ||
855 | /* Get hardware watchpoint register info. */ | |
856 | if (ptrace (PTRACE_GETREGSET, tid, NT_ARM_HW_WATCH, &iov) == 0 | |
857 | && AARCH64_DEBUG_ARCH (dreg_state.dbg_info) == AARCH64_DEBUG_ARCH_V8) | |
858 | { | |
859 | aarch64_num_wp_regs = AARCH64_DEBUG_NUM_SLOTS (dreg_state.dbg_info); | |
860 | if (aarch64_num_wp_regs > AARCH64_HWP_MAX_NUM) | |
861 | { | |
1d3ffd6b MS |
862 | warning (_("Unexpected number of hardware watchpoint registers" |
863 | " reported by ptrace, got %d, expected %d."), | |
9d19df75 MS |
864 | aarch64_num_wp_regs, AARCH64_HWP_MAX_NUM); |
865 | aarch64_num_wp_regs = AARCH64_HWP_MAX_NUM; | |
866 | } | |
867 | } | |
868 | else | |
869 | { | |
1d3ffd6b MS |
870 | warning (_("Unable to determine the number of hardware watchpoints" |
871 | " available.")); | |
9d19df75 MS |
872 | aarch64_num_wp_regs = 0; |
873 | } | |
874 | ||
875 | /* Get hardware breakpoint register info. */ | |
876 | if (ptrace (PTRACE_GETREGSET, tid, NT_ARM_HW_BREAK, &iov) == 0 | |
877 | && AARCH64_DEBUG_ARCH (dreg_state.dbg_info) == AARCH64_DEBUG_ARCH_V8) | |
878 | { | |
879 | aarch64_num_bp_regs = AARCH64_DEBUG_NUM_SLOTS (dreg_state.dbg_info); | |
880 | if (aarch64_num_bp_regs > AARCH64_HBP_MAX_NUM) | |
881 | { | |
1d3ffd6b MS |
882 | warning (_("Unexpected number of hardware breakpoint registers" |
883 | " reported by ptrace, got %d, expected %d."), | |
9d19df75 MS |
884 | aarch64_num_bp_regs, AARCH64_HBP_MAX_NUM); |
885 | aarch64_num_bp_regs = AARCH64_HBP_MAX_NUM; | |
886 | } | |
887 | } | |
888 | else | |
889 | { | |
1d3ffd6b MS |
890 | warning (_("Unable to determine the number of hardware breakpoints" |
891 | " available.")); | |
9d19df75 MS |
892 | aarch64_num_bp_regs = 0; |
893 | } | |
894 | } | |
895 | ||
2e97a79e TT |
896 | static void (*super_post_startup_inferior) (struct target_ops *self, |
897 | ptid_t ptid); | |
9d19df75 MS |
898 | |
899 | /* Implement the "to_post_startup_inferior" target_ops method. */ | |
900 | ||
901 | static void | |
2e97a79e TT |
902 | aarch64_linux_child_post_startup_inferior (struct target_ops *self, |
903 | ptid_t ptid) | |
9d19df75 | 904 | { |
d6c44983 | 905 | aarch64_forget_process (ptid_get_pid (ptid)); |
0f4576e3 | 906 | aarch64_linux_get_debug_reg_capacity (ptid); |
2e97a79e | 907 | super_post_startup_inferior (self, ptid); |
9d19df75 MS |
908 | } |
909 | ||
607685ec YQ |
910 | extern struct target_desc *tdesc_arm_with_vfpv3; |
911 | extern struct target_desc *tdesc_arm_with_neon; | |
912 | ||
9d19df75 MS |
913 | /* Implement the "to_read_description" target_ops method. */ |
914 | ||
915 | static const struct target_desc * | |
916 | aarch64_linux_read_description (struct target_ops *ops) | |
917 | { | |
607685ec YQ |
918 | CORE_ADDR at_phent; |
919 | ||
920 | if (target_auxv_search (ops, AT_PHENT, &at_phent) == 1) | |
921 | { | |
922 | if (at_phent == sizeof (Elf64_External_Phdr)) | |
923 | return tdesc_aarch64; | |
924 | else | |
925 | { | |
926 | CORE_ADDR arm_hwcap = 0; | |
927 | ||
928 | if (target_auxv_search (ops, AT_HWCAP, &arm_hwcap) != 1) | |
929 | return ops->beneath->to_read_description (ops->beneath); | |
930 | ||
931 | #ifndef COMPAT_HWCAP_VFP | |
932 | #define COMPAT_HWCAP_VFP (1 << 6) | |
933 | #endif | |
934 | #ifndef COMPAT_HWCAP_NEON | |
935 | #define COMPAT_HWCAP_NEON (1 << 12) | |
936 | #endif | |
937 | #ifndef COMPAT_HWCAP_VFPv3 | |
938 | #define COMPAT_HWCAP_VFPv3 (1 << 13) | |
939 | #endif | |
940 | ||
941 | if (arm_hwcap & COMPAT_HWCAP_VFP) | |
942 | { | |
943 | char *buf; | |
944 | const struct target_desc *result = NULL; | |
945 | ||
946 | if (arm_hwcap & COMPAT_HWCAP_NEON) | |
947 | result = tdesc_arm_with_neon; | |
948 | else if (arm_hwcap & COMPAT_HWCAP_VFPv3) | |
949 | result = tdesc_arm_with_vfpv3; | |
950 | ||
951 | return result; | |
952 | } | |
953 | ||
954 | return NULL; | |
955 | } | |
956 | } | |
957 | ||
9d19df75 MS |
958 | return tdesc_aarch64; |
959 | } | |
960 | ||
961 | /* Given the (potentially unaligned) watchpoint address in ADDR and | |
962 | length in LEN, return the aligned address and aligned length in | |
963 | *ALIGNED_ADDR_P and *ALIGNED_LEN_P, respectively. The returned | |
964 | aligned address and length will be valid values to write to the | |
965 | hardware watchpoint value and control registers. | |
966 | ||
967 | The given watchpoint may get truncated if more than one hardware | |
968 | register is needed to cover the watched region. *NEXT_ADDR_P | |
969 | and *NEXT_LEN_P, if non-NULL, will return the address and length | |
970 | of the remaining part of the watchpoint (which can be processed | |
971 | by calling this routine again to generate another aligned address | |
972 | and length pair. | |
973 | ||
974 | See the comment above the function of the same name in | |
975 | gdbserver/linux-aarch64-low.c for more information. */ | |
976 | ||
977 | static void | |
978 | aarch64_align_watchpoint (CORE_ADDR addr, int len, CORE_ADDR *aligned_addr_p, | |
979 | int *aligned_len_p, CORE_ADDR *next_addr_p, | |
980 | int *next_len_p) | |
981 | { | |
982 | int aligned_len; | |
983 | unsigned int offset; | |
984 | CORE_ADDR aligned_addr; | |
985 | const unsigned int alignment = AARCH64_HWP_ALIGNMENT; | |
986 | const unsigned int max_wp_len = AARCH64_HWP_MAX_LEN_PER_REG; | |
987 | ||
988 | /* As assumed by the algorithm. */ | |
989 | gdb_assert (alignment == max_wp_len); | |
990 | ||
991 | if (len <= 0) | |
992 | return; | |
993 | ||
994 | /* Address to be put into the hardware watchpoint value register | |
995 | must be aligned. */ | |
996 | offset = addr & (alignment - 1); | |
997 | aligned_addr = addr - offset; | |
998 | ||
999 | gdb_assert (offset >= 0 && offset < alignment); | |
1000 | gdb_assert (aligned_addr >= 0 && aligned_addr <= addr); | |
1001 | gdb_assert (offset + len > 0); | |
1002 | ||
1003 | if (offset + len >= max_wp_len) | |
1004 | { | |
1005 | /* Need more than one watchpoint registers; truncate it at the | |
1006 | alignment boundary. */ | |
1007 | aligned_len = max_wp_len; | |
1008 | len -= (max_wp_len - offset); | |
1009 | addr += (max_wp_len - offset); | |
1010 | gdb_assert ((addr & (alignment - 1)) == 0); | |
1011 | } | |
1012 | else | |
1013 | { | |
1014 | /* Find the smallest valid length that is large enough to | |
1015 | accommodate this watchpoint. */ | |
1016 | static const unsigned char | |
1017 | aligned_len_array[AARCH64_HWP_MAX_LEN_PER_REG] = | |
1018 | { 1, 2, 4, 4, 8, 8, 8, 8 }; | |
1019 | ||
1020 | aligned_len = aligned_len_array[offset + len - 1]; | |
1021 | addr += len; | |
1022 | len = 0; | |
1023 | } | |
1024 | ||
1025 | if (aligned_addr_p) | |
1026 | *aligned_addr_p = aligned_addr; | |
1027 | if (aligned_len_p) | |
1028 | *aligned_len_p = aligned_len; | |
1029 | if (next_addr_p) | |
1030 | *next_addr_p = addr; | |
1031 | if (next_len_p) | |
1032 | *next_len_p = len; | |
1033 | } | |
1034 | ||
1035 | /* Returns the number of hardware watchpoints of type TYPE that we can | |
1036 | set. Value is positive if we can set CNT watchpoints, zero if | |
1037 | setting watchpoints of type TYPE is not supported, and negative if | |
1038 | CNT is more than the maximum number of watchpoints of type TYPE | |
1039 | that we can support. TYPE is one of bp_hardware_watchpoint, | |
1040 | bp_read_watchpoint, bp_write_watchpoint, or bp_hardware_breakpoint. | |
1041 | CNT is the number of such watchpoints used so far (including this | |
1042 | one). OTHERTYPE is non-zero if other types of watchpoints are | |
1043 | currently enabled. | |
1044 | ||
1045 | We always return 1 here because we don't have enough information | |
1046 | about possible overlap of addresses that they want to watch. As an | |
1047 | extreme example, consider the case where all the watchpoints watch | |
1048 | the same address and the same region length: then we can handle a | |
1049 | virtually unlimited number of watchpoints, due to debug register | |
1050 | sharing implemented via reference counts. */ | |
1051 | ||
1052 | static int | |
5461485a TT |
1053 | aarch64_linux_can_use_hw_breakpoint (struct target_ops *self, |
1054 | int type, int cnt, int othertype) | |
9d19df75 MS |
1055 | { |
1056 | return 1; | |
1057 | } | |
1058 | ||
1059 | /* ptrace expects control registers to be formatted as follows: | |
1060 | ||
1061 | 31 13 5 3 1 0 | |
1062 | +--------------------------------+----------+------+------+----+ | |
1063 | | RESERVED (SBZ) | LENGTH | TYPE | PRIV | EN | | |
1064 | +--------------------------------+----------+------+------+----+ | |
1065 | ||
1066 | The TYPE field is ignored for breakpoints. */ | |
1067 | ||
1068 | #define DR_CONTROL_ENABLED(ctrl) (((ctrl) & 0x1) == 1) | |
1069 | #define DR_CONTROL_LENGTH(ctrl) (((ctrl) >> 5) & 0xff) | |
1070 | ||
1071 | /* Utility function that returns the length in bytes of a watchpoint | |
1072 | according to the content of a hardware debug control register CTRL. | |
1073 | Note that the kernel currently only supports the following Byte | |
1074 | Address Select (BAS) values: 0x1, 0x3, 0xf and 0xff, which means | |
1075 | that for a hardware watchpoint, its valid length can only be 1 | |
1076 | byte, 2 bytes, 4 bytes or 8 bytes. */ | |
1077 | ||
1078 | static inline unsigned int | |
1079 | aarch64_watchpoint_length (unsigned int ctrl) | |
1080 | { | |
1081 | switch (DR_CONTROL_LENGTH (ctrl)) | |
1082 | { | |
1083 | case 0x01: | |
1084 | return 1; | |
1085 | case 0x03: | |
1086 | return 2; | |
1087 | case 0x0f: | |
1088 | return 4; | |
1089 | case 0xff: | |
1090 | return 8; | |
1091 | default: | |
1092 | return 0; | |
1093 | } | |
1094 | } | |
1095 | ||
1096 | /* Given the hardware breakpoint or watchpoint type TYPE and its | |
1097 | length LEN, return the expected encoding for a hardware | |
1098 | breakpoint/watchpoint control register. */ | |
1099 | ||
1100 | static unsigned int | |
1101 | aarch64_point_encode_ctrl_reg (int type, int len) | |
1102 | { | |
1103 | unsigned int ctrl, ttype; | |
1104 | ||
1105 | /* type */ | |
1106 | switch (type) | |
1107 | { | |
1108 | case hw_write: | |
1109 | ttype = 2; | |
1110 | break; | |
1111 | case hw_read: | |
1112 | ttype = 1; | |
1113 | break; | |
1114 | case hw_access: | |
1115 | ttype = 3; | |
1116 | break; | |
1117 | case hw_execute: | |
1118 | ttype = 0; | |
1119 | break; | |
1120 | default: | |
1121 | perror_with_name (_("Unrecognized breakpoint/watchpoint type")); | |
1122 | } | |
1123 | ctrl = ttype << 3; | |
1124 | ||
1125 | /* length bitmask */ | |
1126 | ctrl |= ((1 << len) - 1) << 5; | |
1127 | /* enabled at el0 */ | |
1128 | ctrl |= (2 << 1) | 1; | |
1129 | ||
1130 | return ctrl; | |
1131 | } | |
1132 | ||
1133 | /* Addresses to be written to the hardware breakpoint and watchpoint | |
1134 | value registers need to be aligned; the alignment is 4-byte and | |
1135 | 8-type respectively. Linux kernel rejects any non-aligned address | |
1136 | it receives from the related ptrace call. Furthermore, the kernel | |
1137 | currently only supports the following Byte Address Select (BAS) | |
1138 | values: 0x1, 0x3, 0xf and 0xff, which means that for a hardware | |
1139 | watchpoint to be accepted by the kernel (via ptrace call), its | |
1140 | valid length can only be 1 byte, 2 bytes, 4 bytes or 8 bytes. | |
1141 | Despite these limitations, the unaligned watchpoint is supported in | |
1142 | this port. | |
1143 | ||
1144 | Return 0 for any non-compliant ADDR and/or LEN; return 1 otherwise. */ | |
1145 | ||
1146 | static int | |
1147 | aarch64_point_is_aligned (int is_watchpoint, CORE_ADDR addr, int len) | |
1148 | { | |
1149 | unsigned int alignment = is_watchpoint ? AARCH64_HWP_ALIGNMENT | |
1150 | : AARCH64_HBP_ALIGNMENT; | |
1151 | ||
1152 | if (addr & (alignment - 1)) | |
1153 | return 0; | |
1154 | ||
1155 | if (len != 8 && len != 4 && len != 2 && len != 1) | |
1156 | return 0; | |
1157 | ||
1158 | return 1; | |
1159 | } | |
1160 | ||
1161 | /* Record the insertion of one breakpoint/watchpoint, as represented | |
1162 | by ADDR and CTRL, in the cached debug register state area *STATE. */ | |
1163 | ||
1164 | static int | |
1165 | aarch64_dr_state_insert_one_point (struct aarch64_debug_reg_state *state, | |
1166 | int type, CORE_ADDR addr, int len) | |
1167 | { | |
1168 | int i, idx, num_regs, is_watchpoint; | |
1169 | unsigned int ctrl, *dr_ctrl_p, *dr_ref_count; | |
1170 | CORE_ADDR *dr_addr_p; | |
1171 | ||
1172 | /* Set up state pointers. */ | |
1173 | is_watchpoint = (type != hw_execute); | |
1174 | gdb_assert (aarch64_point_is_aligned (is_watchpoint, addr, len)); | |
1175 | if (is_watchpoint) | |
1176 | { | |
1177 | num_regs = aarch64_num_wp_regs; | |
1178 | dr_addr_p = state->dr_addr_wp; | |
1179 | dr_ctrl_p = state->dr_ctrl_wp; | |
1180 | dr_ref_count = state->dr_ref_count_wp; | |
1181 | } | |
1182 | else | |
1183 | { | |
1184 | num_regs = aarch64_num_bp_regs; | |
1185 | dr_addr_p = state->dr_addr_bp; | |
1186 | dr_ctrl_p = state->dr_ctrl_bp; | |
1187 | dr_ref_count = state->dr_ref_count_bp; | |
1188 | } | |
1189 | ||
1190 | ctrl = aarch64_point_encode_ctrl_reg (type, len); | |
1191 | ||
1192 | /* Find an existing or free register in our cache. */ | |
1193 | idx = -1; | |
1194 | for (i = 0; i < num_regs; ++i) | |
1195 | { | |
1196 | if ((dr_ctrl_p[i] & 1) == 0) | |
1197 | { | |
1198 | gdb_assert (dr_ref_count[i] == 0); | |
1199 | idx = i; | |
1200 | /* no break; continue hunting for an existing one. */ | |
1201 | } | |
1202 | else if (dr_addr_p[i] == addr && dr_ctrl_p[i] == ctrl) | |
1203 | { | |
1204 | gdb_assert (dr_ref_count[i] != 0); | |
1205 | idx = i; | |
1206 | break; | |
1207 | } | |
1208 | } | |
1209 | ||
1210 | /* No space. */ | |
1211 | if (idx == -1) | |
1212 | return -1; | |
1213 | ||
1214 | /* Update our cache. */ | |
1215 | if ((dr_ctrl_p[idx] & 1) == 0) | |
1216 | { | |
1217 | /* new entry */ | |
1218 | dr_addr_p[idx] = addr; | |
1219 | dr_ctrl_p[idx] = ctrl; | |
1220 | dr_ref_count[idx] = 1; | |
1221 | /* Notify the change. */ | |
1222 | aarch64_notify_debug_reg_change (state, is_watchpoint, idx); | |
1223 | } | |
1224 | else | |
1225 | { | |
1226 | /* existing entry */ | |
1227 | dr_ref_count[idx]++; | |
1228 | } | |
1229 | ||
1230 | return 0; | |
1231 | } | |
1232 | ||
1233 | /* Record the removal of one breakpoint/watchpoint, as represented by | |
1234 | ADDR and CTRL, in the cached debug register state area *STATE. */ | |
1235 | ||
1236 | static int | |
1237 | aarch64_dr_state_remove_one_point (struct aarch64_debug_reg_state *state, | |
1238 | int type, CORE_ADDR addr, int len) | |
1239 | { | |
1240 | int i, num_regs, is_watchpoint; | |
1241 | unsigned int ctrl, *dr_ctrl_p, *dr_ref_count; | |
1242 | CORE_ADDR *dr_addr_p; | |
1243 | ||
1244 | /* Set up state pointers. */ | |
1245 | is_watchpoint = (type != hw_execute); | |
1246 | gdb_assert (aarch64_point_is_aligned (is_watchpoint, addr, len)); | |
1247 | if (is_watchpoint) | |
1248 | { | |
1249 | num_regs = aarch64_num_wp_regs; | |
1250 | dr_addr_p = state->dr_addr_wp; | |
1251 | dr_ctrl_p = state->dr_ctrl_wp; | |
1252 | dr_ref_count = state->dr_ref_count_wp; | |
1253 | } | |
1254 | else | |
1255 | { | |
1256 | num_regs = aarch64_num_bp_regs; | |
1257 | dr_addr_p = state->dr_addr_bp; | |
1258 | dr_ctrl_p = state->dr_ctrl_bp; | |
1259 | dr_ref_count = state->dr_ref_count_bp; | |
1260 | } | |
1261 | ||
1262 | ctrl = aarch64_point_encode_ctrl_reg (type, len); | |
1263 | ||
1264 | /* Find the entry that matches the ADDR and CTRL. */ | |
1265 | for (i = 0; i < num_regs; ++i) | |
1266 | if (dr_addr_p[i] == addr && dr_ctrl_p[i] == ctrl) | |
1267 | { | |
1268 | gdb_assert (dr_ref_count[i] != 0); | |
1269 | break; | |
1270 | } | |
1271 | ||
1272 | /* Not found. */ | |
1273 | if (i == num_regs) | |
1274 | return -1; | |
1275 | ||
1276 | /* Clear our cache. */ | |
1277 | if (--dr_ref_count[i] == 0) | |
1278 | { | |
1279 | /* Clear the enable bit. */ | |
1280 | ctrl &= ~1; | |
1281 | dr_addr_p[i] = 0; | |
1282 | dr_ctrl_p[i] = ctrl; | |
1283 | /* Notify the change. */ | |
1284 | aarch64_notify_debug_reg_change (state, is_watchpoint, i); | |
1285 | } | |
1286 | ||
1287 | return 0; | |
1288 | } | |
1289 | ||
1290 | /* Implement insertion and removal of a single breakpoint. */ | |
1291 | ||
1292 | static int | |
1293 | aarch64_handle_breakpoint (int type, CORE_ADDR addr, int len, int is_insert) | |
1294 | { | |
1295 | struct aarch64_debug_reg_state *state; | |
1296 | ||
1297 | /* The hardware breakpoint on AArch64 should always be 4-byte | |
1298 | aligned. */ | |
1299 | if (!aarch64_point_is_aligned (0 /* is_watchpoint */ , addr, len)) | |
1300 | return -1; | |
1301 | ||
d6c44983 | 1302 | state = aarch64_get_debug_reg_state (ptid_get_pid (inferior_ptid)); |
9d19df75 MS |
1303 | |
1304 | if (is_insert) | |
1305 | return aarch64_dr_state_insert_one_point (state, type, addr, len); | |
1306 | else | |
1307 | return aarch64_dr_state_remove_one_point (state, type, addr, len); | |
1308 | } | |
1309 | ||
0d5ed153 | 1310 | /* Insert a hardware-assisted breakpoint at BP_TGT->reqstd_address. |
9d19df75 MS |
1311 | Return 0 on success, -1 on failure. */ |
1312 | ||
1313 | static int | |
23a26771 TT |
1314 | aarch64_linux_insert_hw_breakpoint (struct target_ops *self, |
1315 | struct gdbarch *gdbarch, | |
9d19df75 MS |
1316 | struct bp_target_info *bp_tgt) |
1317 | { | |
1318 | int ret; | |
0d5ed153 | 1319 | CORE_ADDR addr = bp_tgt->placed_address = bp_tgt->reqstd_address; |
9d19df75 MS |
1320 | const int len = 4; |
1321 | const int type = hw_execute; | |
1322 | ||
c5e92cca | 1323 | if (show_debug_regs) |
9d19df75 MS |
1324 | fprintf_unfiltered |
1325 | (gdb_stdlog, | |
1326 | "insert_hw_breakpoint on entry (addr=0x%08lx, len=%d))\n", | |
1327 | (unsigned long) addr, len); | |
1328 | ||
1329 | ret = aarch64_handle_breakpoint (type, addr, len, 1 /* is_insert */); | |
1330 | ||
c5e92cca | 1331 | if (show_debug_regs) |
d6c44983 YZ |
1332 | { |
1333 | struct aarch64_debug_reg_state *state | |
1334 | = aarch64_get_debug_reg_state (ptid_get_pid (inferior_ptid)); | |
1335 | ||
1336 | aarch64_show_debug_reg_state (state, | |
2fd0f80d | 1337 | "insert_hw_breakpoint", addr, len, type); |
d6c44983 | 1338 | } |
9d19df75 MS |
1339 | |
1340 | return ret; | |
1341 | } | |
1342 | ||
1343 | /* Remove a hardware-assisted breakpoint at BP_TGT->placed_address. | |
1344 | Return 0 on success, -1 on failure. */ | |
1345 | ||
1346 | static int | |
a64dc96c TT |
1347 | aarch64_linux_remove_hw_breakpoint (struct target_ops *self, |
1348 | struct gdbarch *gdbarch, | |
9d19df75 MS |
1349 | struct bp_target_info *bp_tgt) |
1350 | { | |
1351 | int ret; | |
1352 | CORE_ADDR addr = bp_tgt->placed_address; | |
1353 | const int len = 4; | |
1354 | const int type = hw_execute; | |
1355 | ||
c5e92cca | 1356 | if (show_debug_regs) |
9d19df75 MS |
1357 | fprintf_unfiltered |
1358 | (gdb_stdlog, "remove_hw_breakpoint on entry (addr=0x%08lx, len=%d))\n", | |
1359 | (unsigned long) addr, len); | |
1360 | ||
1361 | ret = aarch64_handle_breakpoint (type, addr, len, 0 /* is_insert */); | |
1362 | ||
c5e92cca | 1363 | if (show_debug_regs) |
d6c44983 YZ |
1364 | { |
1365 | struct aarch64_debug_reg_state *state | |
1366 | = aarch64_get_debug_reg_state (ptid_get_pid (inferior_ptid)); | |
1367 | ||
1368 | aarch64_show_debug_reg_state (state, | |
1369 | "remove_hw_watchpoint", addr, len, type); | |
1370 | } | |
9d19df75 MS |
1371 | |
1372 | return ret; | |
1373 | } | |
1374 | ||
1375 | /* This is essentially the same as aarch64_handle_breakpoint, apart | |
1376 | from that it is an aligned watchpoint to be handled. */ | |
1377 | ||
1378 | static int | |
1379 | aarch64_handle_aligned_watchpoint (int type, CORE_ADDR addr, int len, | |
1380 | int is_insert) | |
1381 | { | |
d6c44983 YZ |
1382 | struct aarch64_debug_reg_state *state |
1383 | = aarch64_get_debug_reg_state (ptid_get_pid (inferior_ptid)); | |
9d19df75 MS |
1384 | |
1385 | if (is_insert) | |
1386 | return aarch64_dr_state_insert_one_point (state, type, addr, len); | |
1387 | else | |
1388 | return aarch64_dr_state_remove_one_point (state, type, addr, len); | |
1389 | } | |
1390 | ||
1391 | /* Insert/remove unaligned watchpoint by calling | |
1392 | aarch64_align_watchpoint repeatedly until the whole watched region, | |
1393 | as represented by ADDR and LEN, has been properly aligned and ready | |
1394 | to be written to one or more hardware watchpoint registers. | |
1395 | IS_INSERT indicates whether this is an insertion or a deletion. | |
1396 | Return 0 if succeed. */ | |
1397 | ||
1398 | static int | |
1399 | aarch64_handle_unaligned_watchpoint (int type, CORE_ADDR addr, int len, | |
1400 | int is_insert) | |
1401 | { | |
d6c44983 YZ |
1402 | struct aarch64_debug_reg_state *state |
1403 | = aarch64_get_debug_reg_state (ptid_get_pid (inferior_ptid)); | |
9d19df75 MS |
1404 | |
1405 | while (len > 0) | |
1406 | { | |
1407 | CORE_ADDR aligned_addr; | |
1408 | int aligned_len, ret; | |
1409 | ||
1410 | aarch64_align_watchpoint (addr, len, &aligned_addr, &aligned_len, | |
1411 | &addr, &len); | |
1412 | ||
1413 | if (is_insert) | |
1414 | ret = aarch64_dr_state_insert_one_point (state, type, aligned_addr, | |
1415 | aligned_len); | |
1416 | else | |
1417 | ret = aarch64_dr_state_remove_one_point (state, type, aligned_addr, | |
1418 | aligned_len); | |
1419 | ||
c5e92cca | 1420 | if (show_debug_regs) |
9d19df75 MS |
1421 | fprintf_unfiltered (gdb_stdlog, |
1422 | "handle_unaligned_watchpoint: is_insert: %d\n" | |
1423 | " aligned_addr: 0x%08lx, aligned_len: %d\n" | |
1424 | " next_addr: 0x%08lx, next_len: %d\n", | |
1425 | is_insert, aligned_addr, aligned_len, addr, len); | |
1426 | ||
1427 | if (ret != 0) | |
1428 | return ret; | |
1429 | } | |
1430 | ||
1431 | return 0; | |
1432 | } | |
1433 | ||
1434 | /* Implements insertion and removal of a single watchpoint. */ | |
1435 | ||
1436 | static int | |
1437 | aarch64_handle_watchpoint (int type, CORE_ADDR addr, int len, int is_insert) | |
1438 | { | |
1439 | if (aarch64_point_is_aligned (1 /* is_watchpoint */ , addr, len)) | |
1440 | return aarch64_handle_aligned_watchpoint (type, addr, len, is_insert); | |
1441 | else | |
1442 | return aarch64_handle_unaligned_watchpoint (type, addr, len, is_insert); | |
1443 | } | |
1444 | ||
1445 | /* Implement the "to_insert_watchpoint" target_ops method. | |
1446 | ||
1447 | Insert a watchpoint to watch a memory region which starts at | |
1448 | address ADDR and whose length is LEN bytes. Watch memory accesses | |
1449 | of the type TYPE. Return 0 on success, -1 on failure. */ | |
1450 | ||
1451 | static int | |
7bb99c53 TT |
1452 | aarch64_linux_insert_watchpoint (struct target_ops *self, |
1453 | CORE_ADDR addr, int len, int type, | |
9d19df75 MS |
1454 | struct expression *cond) |
1455 | { | |
1456 | int ret; | |
1457 | ||
c5e92cca | 1458 | if (show_debug_regs) |
9d19df75 MS |
1459 | fprintf_unfiltered (gdb_stdlog, |
1460 | "insert_watchpoint on entry (addr=0x%08lx, len=%d)\n", | |
1461 | (unsigned long) addr, len); | |
1462 | ||
1463 | gdb_assert (type != hw_execute); | |
1464 | ||
1465 | ret = aarch64_handle_watchpoint (type, addr, len, 1 /* is_insert */); | |
1466 | ||
c5e92cca | 1467 | if (show_debug_regs) |
d6c44983 YZ |
1468 | { |
1469 | struct aarch64_debug_reg_state *state | |
1470 | = aarch64_get_debug_reg_state (ptid_get_pid (inferior_ptid)); | |
1471 | ||
1472 | aarch64_show_debug_reg_state (state, | |
1473 | "insert_watchpoint", addr, len, type); | |
1474 | } | |
9d19df75 MS |
1475 | |
1476 | return ret; | |
1477 | } | |
1478 | ||
1479 | /* Implement the "to_remove_watchpoint" target_ops method. | |
1480 | Remove a watchpoint that watched the memory region which starts at | |
1481 | address ADDR, whose length is LEN bytes, and for accesses of the | |
1482 | type TYPE. Return 0 on success, -1 on failure. */ | |
1483 | ||
1484 | static int | |
11b5219a TT |
1485 | aarch64_linux_remove_watchpoint (struct target_ops *self, |
1486 | CORE_ADDR addr, int len, int type, | |
9d19df75 MS |
1487 | struct expression *cond) |
1488 | { | |
1489 | int ret; | |
1490 | ||
c5e92cca | 1491 | if (show_debug_regs) |
9d19df75 MS |
1492 | fprintf_unfiltered (gdb_stdlog, |
1493 | "remove_watchpoint on entry (addr=0x%08lx, len=%d)\n", | |
1494 | (unsigned long) addr, len); | |
1495 | ||
1496 | gdb_assert (type != hw_execute); | |
1497 | ||
1498 | ret = aarch64_handle_watchpoint (type, addr, len, 0 /* is_insert */); | |
1499 | ||
c5e92cca | 1500 | if (show_debug_regs) |
d6c44983 YZ |
1501 | { |
1502 | struct aarch64_debug_reg_state *state | |
1503 | = aarch64_get_debug_reg_state (ptid_get_pid (inferior_ptid)); | |
1504 | ||
1505 | aarch64_show_debug_reg_state (state, | |
1506 | "remove_watchpoint", addr, len, type); | |
1507 | } | |
9d19df75 MS |
1508 | |
1509 | return ret; | |
1510 | } | |
1511 | ||
1512 | /* Implement the "to_region_ok_for_hw_watchpoint" target_ops method. */ | |
1513 | ||
1514 | static int | |
31568a15 TT |
1515 | aarch64_linux_region_ok_for_hw_watchpoint (struct target_ops *self, |
1516 | CORE_ADDR addr, int len) | |
9d19df75 MS |
1517 | { |
1518 | CORE_ADDR aligned_addr; | |
1519 | ||
1520 | /* Can not set watchpoints for zero or negative lengths. */ | |
1521 | if (len <= 0) | |
1522 | return 0; | |
1523 | ||
1524 | /* Must have hardware watchpoint debug register(s). */ | |
1525 | if (aarch64_num_wp_regs == 0) | |
1526 | return 0; | |
1527 | ||
1528 | /* We support unaligned watchpoint address and arbitrary length, | |
1529 | as long as the size of the whole watched area after alignment | |
1530 | doesn't exceed size of the total area that all watchpoint debug | |
1531 | registers can watch cooperatively. | |
1532 | ||
1533 | This is a very relaxed rule, but unfortunately there are | |
1534 | limitations, e.g. false-positive hits, due to limited support of | |
1535 | hardware debug registers in the kernel. See comment above | |
1536 | aarch64_align_watchpoint for more information. */ | |
1537 | ||
1538 | aligned_addr = addr & ~(AARCH64_HWP_MAX_LEN_PER_REG - 1); | |
1539 | if (aligned_addr + aarch64_num_wp_regs * AARCH64_HWP_MAX_LEN_PER_REG | |
1540 | < addr + len) | |
1541 | return 0; | |
1542 | ||
1543 | /* All tests passed so we are likely to be able to set the watchpoint. | |
1544 | The reason that it is 'likely' rather than 'must' is because | |
1545 | we don't check the current usage of the watchpoint registers, and | |
1546 | there may not be enough registers available for this watchpoint. | |
1547 | Ideally we should check the cached debug register state, however | |
1548 | the checking is costly. */ | |
1549 | return 1; | |
1550 | } | |
1551 | ||
1552 | /* Implement the "to_stopped_data_address" target_ops method. */ | |
1553 | ||
1554 | static int | |
1555 | aarch64_linux_stopped_data_address (struct target_ops *target, | |
1556 | CORE_ADDR *addr_p) | |
1557 | { | |
1558 | siginfo_t siginfo; | |
1559 | int i, tid; | |
1560 | struct aarch64_debug_reg_state *state; | |
1561 | ||
1562 | if (!linux_nat_get_siginfo (inferior_ptid, &siginfo)) | |
1563 | return 0; | |
1564 | ||
1565 | /* This must be a hardware breakpoint. */ | |
1566 | if (siginfo.si_signo != SIGTRAP | |
1567 | || (siginfo.si_code & 0xffff) != TRAP_HWBKPT) | |
1568 | return 0; | |
1569 | ||
1570 | /* Check if the address matches any watched address. */ | |
d6c44983 | 1571 | state = aarch64_get_debug_reg_state (ptid_get_pid (inferior_ptid)); |
9d19df75 MS |
1572 | for (i = aarch64_num_wp_regs - 1; i >= 0; --i) |
1573 | { | |
1574 | const unsigned int len = aarch64_watchpoint_length (state->dr_ctrl_wp[i]); | |
1575 | const CORE_ADDR addr_trap = (CORE_ADDR) siginfo.si_addr; | |
1576 | const CORE_ADDR addr_watch = state->dr_addr_wp[i]; | |
1577 | ||
1578 | if (state->dr_ref_count_wp[i] | |
1579 | && DR_CONTROL_ENABLED (state->dr_ctrl_wp[i]) | |
1580 | && addr_trap >= addr_watch | |
1581 | && addr_trap < addr_watch + len) | |
1582 | { | |
1583 | *addr_p = addr_trap; | |
1584 | return 1; | |
1585 | } | |
1586 | } | |
1587 | ||
1588 | return 0; | |
1589 | } | |
1590 | ||
1591 | /* Implement the "to_stopped_by_watchpoint" target_ops method. */ | |
1592 | ||
1593 | static int | |
6a109b6b | 1594 | aarch64_linux_stopped_by_watchpoint (struct target_ops *ops) |
9d19df75 MS |
1595 | { |
1596 | CORE_ADDR addr; | |
1597 | ||
6a109b6b | 1598 | return aarch64_linux_stopped_data_address (ops, &addr); |
9d19df75 MS |
1599 | } |
1600 | ||
1601 | /* Implement the "to_watchpoint_addr_within_range" target_ops method. */ | |
1602 | ||
1603 | static int | |
1604 | aarch64_linux_watchpoint_addr_within_range (struct target_ops *target, | |
1605 | CORE_ADDR addr, | |
1606 | CORE_ADDR start, int length) | |
1607 | { | |
1608 | return start <= addr && start + length - 1 >= addr; | |
1609 | } | |
1610 | ||
1611 | /* Define AArch64 maintenance commands. */ | |
1612 | ||
1613 | static void | |
1614 | add_show_debug_regs_command (void) | |
1615 | { | |
1616 | /* A maintenance command to enable printing the internal DRi mirror | |
1617 | variables. */ | |
1618 | add_setshow_boolean_cmd ("show-debug-regs", class_maintenance, | |
c5e92cca | 1619 | &show_debug_regs, _("\ |
9d19df75 MS |
1620 | Set whether to show variables that mirror the AArch64 debug registers."), _("\ |
1621 | Show whether to show variables that mirror the AArch64 debug registers."), _("\ | |
1622 | Use \"on\" to enable, \"off\" to disable.\n\ | |
1623 | If enabled, the debug registers values are shown when GDB inserts\n\ | |
1624 | or removes a hardware breakpoint or watchpoint, and when the inferior\n\ | |
1625 | triggers a breakpoint or watchpoint."), | |
1626 | NULL, | |
1627 | NULL, | |
1628 | &maintenance_set_cmdlist, | |
1629 | &maintenance_show_cmdlist); | |
1630 | } | |
1631 | ||
1632 | /* -Wmissing-prototypes. */ | |
1633 | void _initialize_aarch64_linux_nat (void); | |
1634 | ||
1635 | void | |
1636 | _initialize_aarch64_linux_nat (void) | |
1637 | { | |
1638 | struct target_ops *t; | |
1639 | ||
1640 | /* Fill in the generic GNU/Linux methods. */ | |
1641 | t = linux_target (); | |
1642 | ||
1643 | add_show_debug_regs_command (); | |
1644 | ||
1645 | /* Add our register access methods. */ | |
1646 | t->to_fetch_registers = aarch64_linux_fetch_inferior_registers; | |
1647 | t->to_store_registers = aarch64_linux_store_inferior_registers; | |
1648 | ||
1649 | t->to_read_description = aarch64_linux_read_description; | |
1650 | ||
1651 | t->to_can_use_hw_breakpoint = aarch64_linux_can_use_hw_breakpoint; | |
1652 | t->to_insert_hw_breakpoint = aarch64_linux_insert_hw_breakpoint; | |
1653 | t->to_remove_hw_breakpoint = aarch64_linux_remove_hw_breakpoint; | |
1654 | t->to_region_ok_for_hw_watchpoint = | |
1655 | aarch64_linux_region_ok_for_hw_watchpoint; | |
1656 | t->to_insert_watchpoint = aarch64_linux_insert_watchpoint; | |
1657 | t->to_remove_watchpoint = aarch64_linux_remove_watchpoint; | |
1658 | t->to_stopped_by_watchpoint = aarch64_linux_stopped_by_watchpoint; | |
1659 | t->to_stopped_data_address = aarch64_linux_stopped_data_address; | |
1660 | t->to_watchpoint_addr_within_range = | |
1661 | aarch64_linux_watchpoint_addr_within_range; | |
9d19df75 MS |
1662 | |
1663 | /* Override the GNU/Linux inferior startup hook. */ | |
1664 | super_post_startup_inferior = t->to_post_startup_inferior; | |
1665 | t->to_post_startup_inferior = aarch64_linux_child_post_startup_inferior; | |
1666 | ||
1667 | /* Register the target. */ | |
1668 | linux_nat_add_target (t); | |
1669 | linux_nat_set_new_thread (t, aarch64_linux_new_thread); | |
d6c44983 YZ |
1670 | linux_nat_set_new_fork (t, aarch64_linux_new_fork); |
1671 | linux_nat_set_forget_process (t, aarch64_forget_process); | |
9d19df75 MS |
1672 | linux_nat_set_prepare_to_resume (t, aarch64_linux_prepare_to_resume); |
1673 | } |