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9d19df75 MS |
1 | /* Native-dependent code for GNU/Linux AArch64. |
2 | ||
ecd75fc8 | 3 | Copyright (C) 2011-2014 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" | |
32 | #include "elf/common.h" | |
33 | ||
34 | #include <sys/ptrace.h> | |
35 | #include <sys/utsname.h> | |
36 | ||
37 | #include "gregset.h" | |
38 | ||
39 | #include "features/aarch64.c" | |
40 | ||
41 | /* Defines ps_err_e, struct ps_prochandle. */ | |
42 | #include "gdb_proc_service.h" | |
43 | ||
44 | #ifndef TRAP_HWBKPT | |
45 | #define TRAP_HWBKPT 0x0004 | |
46 | #endif | |
47 | ||
48 | /* On GNU/Linux, threads are implemented as pseudo-processes, in which | |
49 | case we may be tracing more than one process at a time. In that | |
50 | case, inferior_ptid will contain the main process ID and the | |
51 | individual thread (process) ID. get_thread_id () is used to get | |
52 | the thread id if it's available, and the process id otherwise. */ | |
53 | ||
54 | static int | |
55 | get_thread_id (ptid_t ptid) | |
56 | { | |
dfd4cc63 | 57 | int tid = ptid_get_lwp (ptid); |
9d19df75 MS |
58 | |
59 | if (0 == tid) | |
dfd4cc63 | 60 | tid = ptid_get_pid (ptid); |
9d19df75 MS |
61 | return tid; |
62 | } | |
63 | ||
64 | /* Macro definitions, data structures, and code for the hardware | |
65 | breakpoint and hardware watchpoint support follow. We use the | |
66 | following abbreviations throughout the code: | |
67 | ||
68 | hw - hardware | |
69 | bp - breakpoint | |
70 | wp - watchpoint */ | |
71 | ||
72 | /* Maximum number of hardware breakpoint and watchpoint registers. | |
73 | Neither of these values may exceed the width of dr_changed_t | |
74 | measured in bits. */ | |
75 | ||
76 | #define AARCH64_HBP_MAX_NUM 16 | |
77 | #define AARCH64_HWP_MAX_NUM 16 | |
78 | ||
79 | /* Alignment requirement in bytes for addresses written to | |
80 | hardware breakpoint and watchpoint value registers. | |
81 | ||
82 | A ptrace call attempting to set an address that does not meet the | |
83 | alignment criteria will fail. Limited support has been provided in | |
84 | this port for unaligned watchpoints, such that from a GDB user | |
85 | perspective, an unaligned watchpoint may be requested. | |
86 | ||
87 | This is achieved by minimally enlarging the watched area to meet the | |
88 | alignment requirement, and if necessary, splitting the watchpoint | |
89 | over several hardware watchpoint registers. */ | |
90 | ||
91 | #define AARCH64_HBP_ALIGNMENT 4 | |
92 | #define AARCH64_HWP_ALIGNMENT 8 | |
93 | ||
94 | /* The maximum length of a memory region that can be watched by one | |
95 | hardware watchpoint register. */ | |
96 | ||
97 | #define AARCH64_HWP_MAX_LEN_PER_REG 8 | |
98 | ||
99 | /* ptrace hardware breakpoint resource info is formatted as follows: | |
100 | ||
101 | 31 24 16 8 0 | |
102 | +---------------+--------------+---------------+---------------+ | |
103 | | RESERVED | RESERVED | DEBUG_ARCH | NUM_SLOTS | | |
104 | +---------------+--------------+---------------+---------------+ */ | |
105 | ||
106 | ||
107 | /* Macros to extract fields from the hardware debug information word. */ | |
108 | #define AARCH64_DEBUG_NUM_SLOTS(x) ((x) & 0xff) | |
109 | #define AARCH64_DEBUG_ARCH(x) (((x) >> 8) & 0xff) | |
110 | ||
111 | /* Macro for the expected version of the ARMv8-A debug architecture. */ | |
112 | #define AARCH64_DEBUG_ARCH_V8 0x6 | |
113 | ||
114 | /* Number of hardware breakpoints/watchpoints the target supports. | |
115 | They are initialized with values obtained via the ptrace calls | |
116 | with NT_ARM_HW_BREAK and NT_ARM_HW_WATCH respectively. */ | |
117 | ||
118 | static int aarch64_num_bp_regs; | |
119 | static int aarch64_num_wp_regs; | |
120 | ||
121 | /* Debugging of hardware breakpoint/watchpoint support. */ | |
122 | ||
123 | static int debug_hw_points; | |
124 | ||
125 | /* Each bit of a variable of this type is used to indicate whether a | |
126 | hardware breakpoint or watchpoint setting has been changed since | |
127 | the last update. | |
128 | ||
129 | Bit N corresponds to the Nth hardware breakpoint or watchpoint | |
130 | setting which is managed in aarch64_debug_reg_state, where N is | |
131 | valid between 0 and the total number of the hardware breakpoint or | |
132 | watchpoint debug registers minus 1. | |
133 | ||
134 | When bit N is 1, the corresponding breakpoint or watchpoint setting | |
135 | has changed, and therefore the corresponding hardware debug | |
136 | register needs to be updated via the ptrace interface. | |
137 | ||
138 | In the per-thread arch-specific data area, we define two such | |
139 | variables for per-thread hardware breakpoint and watchpoint | |
140 | settings respectively. | |
141 | ||
142 | This type is part of the mechanism which helps reduce the number of | |
143 | ptrace calls to the kernel, i.e. avoid asking the kernel to write | |
144 | to the debug registers with unchanged values. */ | |
145 | ||
6eb04473 | 146 | typedef unsigned LONGEST dr_changed_t; |
9d19df75 MS |
147 | |
148 | /* Set each of the lower M bits of X to 1; assert X is wide enough. */ | |
149 | ||
150 | #define DR_MARK_ALL_CHANGED(x, m) \ | |
151 | do \ | |
152 | { \ | |
153 | gdb_assert (sizeof ((x)) * 8 >= (m)); \ | |
154 | (x) = (((dr_changed_t)1 << (m)) - 1); \ | |
155 | } while (0) | |
156 | ||
157 | #define DR_MARK_N_CHANGED(x, n) \ | |
158 | do \ | |
159 | { \ | |
160 | (x) |= ((dr_changed_t)1 << (n)); \ | |
161 | } while (0) | |
162 | ||
163 | #define DR_CLEAR_CHANGED(x) \ | |
164 | do \ | |
165 | { \ | |
166 | (x) = 0; \ | |
167 | } while (0) | |
168 | ||
169 | #define DR_HAS_CHANGED(x) ((x) != 0) | |
170 | #define DR_N_HAS_CHANGED(x, n) ((x) & ((dr_changed_t)1 << (n))) | |
171 | ||
172 | /* Structure for managing the hardware breakpoint/watchpoint resources. | |
173 | DR_ADDR_* stores the address, DR_CTRL_* stores the control register | |
174 | content, and DR_REF_COUNT_* counts the numbers of references to the | |
175 | corresponding bp/wp, by which way the limited hardware resources | |
176 | are not wasted on duplicated bp/wp settings (though so far gdb has | |
177 | done a good job by not sending duplicated bp/wp requests). */ | |
178 | ||
179 | struct aarch64_debug_reg_state | |
180 | { | |
181 | /* hardware breakpoint */ | |
182 | CORE_ADDR dr_addr_bp[AARCH64_HBP_MAX_NUM]; | |
183 | unsigned int dr_ctrl_bp[AARCH64_HBP_MAX_NUM]; | |
184 | unsigned int dr_ref_count_bp[AARCH64_HBP_MAX_NUM]; | |
185 | ||
186 | /* hardware watchpoint */ | |
187 | CORE_ADDR dr_addr_wp[AARCH64_HWP_MAX_NUM]; | |
188 | unsigned int dr_ctrl_wp[AARCH64_HWP_MAX_NUM]; | |
189 | unsigned int dr_ref_count_wp[AARCH64_HWP_MAX_NUM]; | |
190 | }; | |
191 | ||
d6c44983 YZ |
192 | /* Per-process data. We don't bind this to a per-inferior registry |
193 | because of targets like x86 GNU/Linux that need to keep track of | |
194 | processes that aren't bound to any inferior (e.g., fork children, | |
195 | checkpoints). */ | |
9d19df75 | 196 | |
d6c44983 | 197 | struct aarch64_process_info |
9d19df75 | 198 | { |
d6c44983 YZ |
199 | /* Linked list. */ |
200 | struct aarch64_process_info *next; | |
9d19df75 | 201 | |
d6c44983 YZ |
202 | /* The process identifier. */ |
203 | pid_t pid; | |
9d19df75 | 204 | |
d6c44983 YZ |
205 | /* Copy of aarch64 hardware debug registers. */ |
206 | struct aarch64_debug_reg_state state; | |
207 | }; | |
208 | ||
209 | static struct aarch64_process_info *aarch64_process_list = NULL; | |
210 | ||
211 | /* Find process data for process PID. */ | |
212 | ||
213 | static struct aarch64_process_info * | |
214 | aarch64_find_process_pid (pid_t pid) | |
215 | { | |
216 | struct aarch64_process_info *proc; | |
217 | ||
218 | for (proc = aarch64_process_list; proc; proc = proc->next) | |
219 | if (proc->pid == pid) | |
220 | return proc; | |
221 | ||
222 | return NULL; | |
9d19df75 MS |
223 | } |
224 | ||
d6c44983 YZ |
225 | /* Add process data for process PID. Returns newly allocated info |
226 | object. */ | |
9d19df75 | 227 | |
d6c44983 YZ |
228 | static struct aarch64_process_info * |
229 | aarch64_add_process (pid_t pid) | |
9d19df75 | 230 | { |
d6c44983 | 231 | struct aarch64_process_info *proc; |
9d19df75 | 232 | |
d6c44983 YZ |
233 | proc = xcalloc (1, sizeof (*proc)); |
234 | proc->pid = pid; | |
9d19df75 | 235 | |
d6c44983 YZ |
236 | proc->next = aarch64_process_list; |
237 | aarch64_process_list = proc; | |
238 | ||
239 | return proc; | |
240 | } | |
241 | ||
242 | /* Get data specific info for process PID, creating it if necessary. | |
243 | Never returns NULL. */ | |
244 | ||
245 | static struct aarch64_process_info * | |
246 | aarch64_process_info_get (pid_t pid) | |
9d19df75 | 247 | { |
d6c44983 YZ |
248 | struct aarch64_process_info *proc; |
249 | ||
250 | proc = aarch64_find_process_pid (pid); | |
251 | if (proc == NULL) | |
252 | proc = aarch64_add_process (pid); | |
9d19df75 | 253 | |
d6c44983 | 254 | return proc; |
9d19df75 MS |
255 | } |
256 | ||
d6c44983 YZ |
257 | /* Called whenever GDB is no longer debugging process PID. It deletes |
258 | data structures that keep track of debug register state. */ | |
9d19df75 | 259 | |
d6c44983 YZ |
260 | static void |
261 | aarch64_forget_process (pid_t pid) | |
9d19df75 | 262 | { |
d6c44983 | 263 | struct aarch64_process_info *proc, **proc_link; |
9d19df75 | 264 | |
d6c44983 YZ |
265 | proc = aarch64_process_list; |
266 | proc_link = &aarch64_process_list; | |
267 | ||
268 | while (proc != NULL) | |
9d19df75 | 269 | { |
d6c44983 YZ |
270 | if (proc->pid == pid) |
271 | { | |
272 | *proc_link = proc->next; | |
9d19df75 | 273 | |
d6c44983 YZ |
274 | xfree (proc); |
275 | return; | |
276 | } | |
277 | ||
278 | proc_link = &proc->next; | |
279 | proc = *proc_link; | |
280 | } | |
9d19df75 MS |
281 | } |
282 | ||
d6c44983 | 283 | /* Get debug registers state for process PID. */ |
9d19df75 MS |
284 | |
285 | static struct aarch64_debug_reg_state * | |
d6c44983 | 286 | aarch64_get_debug_reg_state (pid_t pid) |
9d19df75 | 287 | { |
d6c44983 | 288 | return &aarch64_process_info_get (pid)->state; |
9d19df75 MS |
289 | } |
290 | ||
291 | /* Per-thread arch-specific data we want to keep. */ | |
292 | ||
293 | struct arch_lwp_info | |
294 | { | |
295 | /* When bit N is 1, it indicates the Nth hardware breakpoint or | |
296 | watchpoint register pair needs to be updated when the thread is | |
297 | resumed; see aarch64_linux_prepare_to_resume. */ | |
298 | dr_changed_t dr_changed_bp; | |
299 | dr_changed_t dr_changed_wp; | |
300 | }; | |
301 | ||
302 | /* Call ptrace to set the thread TID's hardware breakpoint/watchpoint | |
303 | registers with data from *STATE. */ | |
304 | ||
305 | static void | |
306 | aarch64_linux_set_debug_regs (const struct aarch64_debug_reg_state *state, | |
307 | int tid, int watchpoint) | |
308 | { | |
309 | int i, count; | |
310 | struct iovec iov; | |
311 | struct user_hwdebug_state regs; | |
312 | const CORE_ADDR *addr; | |
313 | const unsigned int *ctrl; | |
314 | ||
1aa4cd77 | 315 | memset (®s, 0, sizeof (regs)); |
9d19df75 | 316 | iov.iov_base = ®s; |
9d19df75 MS |
317 | count = watchpoint ? aarch64_num_wp_regs : aarch64_num_bp_regs; |
318 | addr = watchpoint ? state->dr_addr_wp : state->dr_addr_bp; | |
319 | ctrl = watchpoint ? state->dr_ctrl_wp : state->dr_ctrl_bp; | |
f45c82da YZ |
320 | if (count == 0) |
321 | return; | |
322 | iov.iov_len = (offsetof (struct user_hwdebug_state, dbg_regs[count - 1]) | |
323 | + sizeof (regs.dbg_regs [count - 1])); | |
9d19df75 MS |
324 | |
325 | for (i = 0; i < count; i++) | |
326 | { | |
327 | regs.dbg_regs[i].addr = addr[i]; | |
328 | regs.dbg_regs[i].ctrl = ctrl[i]; | |
329 | } | |
330 | ||
331 | if (ptrace (PTRACE_SETREGSET, tid, | |
332 | watchpoint ? NT_ARM_HW_WATCH : NT_ARM_HW_BREAK, | |
333 | (void *) &iov)) | |
334 | error (_("Unexpected error setting hardware debug registers")); | |
335 | } | |
336 | ||
337 | struct aarch64_dr_update_callback_param | |
338 | { | |
339 | int is_watchpoint; | |
340 | unsigned int idx; | |
341 | }; | |
342 | ||
d6c44983 | 343 | /* Callback for iterate_over_lwps. Records the |
9d19df75 MS |
344 | information about the change of one hardware breakpoint/watchpoint |
345 | setting for the thread LWP. | |
346 | The information is passed in via PTR. | |
347 | N.B. The actual updating of hardware debug registers is not | |
348 | carried out until the moment the thread is resumed. */ | |
349 | ||
350 | static int | |
351 | debug_reg_change_callback (struct lwp_info *lwp, void *ptr) | |
352 | { | |
353 | struct aarch64_dr_update_callback_param *param_p | |
354 | = (struct aarch64_dr_update_callback_param *) ptr; | |
355 | int pid = get_thread_id (lwp->ptid); | |
356 | int idx = param_p->idx; | |
357 | int is_watchpoint = param_p->is_watchpoint; | |
358 | struct arch_lwp_info *info = lwp->arch_private; | |
359 | dr_changed_t *dr_changed_ptr; | |
360 | dr_changed_t dr_changed; | |
361 | ||
362 | if (info == NULL) | |
363 | info = lwp->arch_private = XCNEW (struct arch_lwp_info); | |
364 | ||
365 | if (debug_hw_points) | |
366 | { | |
367 | fprintf_unfiltered (gdb_stdlog, | |
368 | "debug_reg_change_callback: \n\tOn entry:\n"); | |
369 | fprintf_unfiltered (gdb_stdlog, | |
1d3ffd6b MS |
370 | "\tpid%d, dr_changed_bp=0x%s, " |
371 | "dr_changed_wp=0x%s\n", | |
372 | pid, phex (info->dr_changed_bp, 8), | |
373 | phex (info->dr_changed_wp, 8)); | |
9d19df75 MS |
374 | } |
375 | ||
376 | dr_changed_ptr = is_watchpoint ? &info->dr_changed_wp | |
377 | : &info->dr_changed_bp; | |
378 | dr_changed = *dr_changed_ptr; | |
379 | ||
380 | gdb_assert (idx >= 0 | |
381 | && (idx <= (is_watchpoint ? aarch64_num_wp_regs | |
382 | : aarch64_num_bp_regs))); | |
383 | ||
384 | /* The actual update is done later just before resuming the lwp, | |
385 | we just mark that one register pair needs updating. */ | |
386 | DR_MARK_N_CHANGED (dr_changed, idx); | |
387 | *dr_changed_ptr = dr_changed; | |
388 | ||
389 | /* If the lwp isn't stopped, force it to momentarily pause, so | |
390 | we can update its debug registers. */ | |
391 | if (!lwp->stopped) | |
392 | linux_stop_lwp (lwp); | |
393 | ||
394 | if (debug_hw_points) | |
395 | { | |
396 | fprintf_unfiltered (gdb_stdlog, | |
1d3ffd6b MS |
397 | "\tOn exit:\n\tpid%d, dr_changed_bp=0x%s, " |
398 | "dr_changed_wp=0x%s\n", | |
399 | pid, phex (info->dr_changed_bp, 8), | |
400 | phex (info->dr_changed_wp, 8)); | |
9d19df75 MS |
401 | } |
402 | ||
403 | /* Continue the iteration. */ | |
404 | return 0; | |
405 | } | |
406 | ||
407 | /* Notify each thread that their IDXth breakpoint/watchpoint register | |
408 | pair needs to be updated. The message will be recorded in each | |
409 | thread's arch-specific data area, the actual updating will be done | |
410 | when the thread is resumed. */ | |
411 | ||
412 | static void | |
413 | aarch64_notify_debug_reg_change (const struct aarch64_debug_reg_state *state, | |
414 | int is_watchpoint, unsigned int idx) | |
415 | { | |
416 | struct aarch64_dr_update_callback_param param; | |
d6c44983 | 417 | ptid_t pid_ptid = pid_to_ptid (ptid_get_pid (inferior_ptid)); |
9d19df75 MS |
418 | |
419 | param.is_watchpoint = is_watchpoint; | |
420 | param.idx = idx; | |
421 | ||
d6c44983 | 422 | iterate_over_lwps (pid_ptid, debug_reg_change_callback, (void *) ¶m); |
9d19df75 MS |
423 | } |
424 | ||
425 | /* Print the values of the cached breakpoint/watchpoint registers. */ | |
426 | ||
427 | static void | |
428 | aarch64_show_debug_reg_state (struct aarch64_debug_reg_state *state, | |
429 | const char *func, CORE_ADDR addr, | |
430 | int len, int type) | |
431 | { | |
432 | int i; | |
433 | ||
434 | fprintf_unfiltered (gdb_stdlog, "%s", func); | |
435 | if (addr || len) | |
436 | fprintf_unfiltered (gdb_stdlog, " (addr=0x%08lx, len=%d, type=%s)", | |
437 | (unsigned long) addr, len, | |
438 | type == hw_write ? "hw-write-watchpoint" | |
439 | : (type == hw_read ? "hw-read-watchpoint" | |
440 | : (type == hw_access ? "hw-access-watchpoint" | |
441 | : (type == hw_execute ? "hw-breakpoint" | |
442 | : "??unknown??")))); | |
443 | fprintf_unfiltered (gdb_stdlog, ":\n"); | |
444 | ||
445 | fprintf_unfiltered (gdb_stdlog, "\tBREAKPOINTs:\n"); | |
446 | for (i = 0; i < aarch64_num_bp_regs; i++) | |
447 | fprintf_unfiltered (gdb_stdlog, | |
448 | "\tBP%d: addr=0x%08lx, ctrl=0x%08x, ref.count=%d\n", | |
449 | i, state->dr_addr_bp[i], | |
450 | state->dr_ctrl_bp[i], state->dr_ref_count_bp[i]); | |
451 | ||
452 | fprintf_unfiltered (gdb_stdlog, "\tWATCHPOINTs:\n"); | |
453 | for (i = 0; i < aarch64_num_wp_regs; i++) | |
454 | fprintf_unfiltered (gdb_stdlog, | |
455 | "\tWP%d: addr=0x%08lx, ctrl=0x%08x, ref.count=%d\n", | |
456 | i, state->dr_addr_wp[i], | |
457 | state->dr_ctrl_wp[i], state->dr_ref_count_wp[i]); | |
458 | } | |
459 | ||
460 | /* Fill GDB's register array with the general-purpose register values | |
461 | from the current thread. */ | |
462 | ||
463 | static void | |
464 | fetch_gregs_from_thread (struct regcache *regcache) | |
465 | { | |
466 | int ret, regno, tid; | |
467 | elf_gregset_t regs; | |
468 | struct iovec iovec; | |
469 | ||
470 | tid = get_thread_id (inferior_ptid); | |
471 | ||
472 | iovec.iov_base = ®s; | |
473 | iovec.iov_len = sizeof (regs); | |
474 | ||
475 | ret = ptrace (PTRACE_GETREGSET, tid, NT_PRSTATUS, &iovec); | |
476 | if (ret < 0) | |
477 | perror_with_name (_("Unable to fetch general registers.")); | |
478 | ||
479 | for (regno = AARCH64_X0_REGNUM; regno <= AARCH64_CPSR_REGNUM; regno++) | |
480 | regcache_raw_supply (regcache, regno, | |
481 | (char *) ®s[regno - AARCH64_X0_REGNUM]); | |
482 | } | |
483 | ||
484 | /* Store to the current thread the valid general-purpose register | |
485 | values in the GDB's register array. */ | |
486 | ||
487 | static void | |
488 | store_gregs_to_thread (const struct regcache *regcache) | |
489 | { | |
490 | int ret, regno, tid; | |
491 | elf_gregset_t regs; | |
492 | struct iovec iovec; | |
493 | ||
494 | tid = get_thread_id (inferior_ptid); | |
495 | ||
496 | iovec.iov_base = ®s; | |
497 | iovec.iov_len = sizeof (regs); | |
498 | ||
499 | ret = ptrace (PTRACE_GETREGSET, tid, NT_PRSTATUS, &iovec); | |
500 | if (ret < 0) | |
501 | perror_with_name (_("Unable to fetch general registers.")); | |
502 | ||
503 | for (regno = AARCH64_X0_REGNUM; regno <= AARCH64_CPSR_REGNUM; regno++) | |
504 | if (REG_VALID == regcache_register_status (regcache, regno)) | |
505 | regcache_raw_collect (regcache, regno, | |
506 | (char *) ®s[regno - AARCH64_X0_REGNUM]); | |
507 | ||
508 | ret = ptrace (PTRACE_SETREGSET, tid, NT_PRSTATUS, &iovec); | |
509 | if (ret < 0) | |
510 | perror_with_name (_("Unable to store general registers.")); | |
511 | } | |
512 | ||
513 | /* Fill GDB's register array with the fp/simd register values | |
514 | from the current thread. */ | |
515 | ||
516 | static void | |
517 | fetch_fpregs_from_thread (struct regcache *regcache) | |
518 | { | |
519 | int ret, regno, tid; | |
520 | elf_fpregset_t regs; | |
521 | struct iovec iovec; | |
522 | ||
523 | tid = get_thread_id (inferior_ptid); | |
524 | ||
525 | iovec.iov_base = ®s; | |
526 | iovec.iov_len = sizeof (regs); | |
527 | ||
528 | ret = ptrace (PTRACE_GETREGSET, tid, NT_FPREGSET, &iovec); | |
529 | if (ret < 0) | |
530 | perror_with_name (_("Unable to fetch FP/SIMD registers.")); | |
531 | ||
532 | for (regno = AARCH64_V0_REGNUM; regno <= AARCH64_V31_REGNUM; regno++) | |
533 | regcache_raw_supply (regcache, regno, | |
534 | (char *) ®s.vregs[regno - AARCH64_V0_REGNUM]); | |
535 | ||
536 | regcache_raw_supply (regcache, AARCH64_FPSR_REGNUM, (char *) ®s.fpsr); | |
537 | regcache_raw_supply (regcache, AARCH64_FPCR_REGNUM, (char *) ®s.fpcr); | |
538 | } | |
539 | ||
540 | /* Store to the current thread the valid fp/simd register | |
541 | values in the GDB's register array. */ | |
542 | ||
543 | static void | |
544 | store_fpregs_to_thread (const struct regcache *regcache) | |
545 | { | |
546 | int ret, regno, tid; | |
547 | elf_fpregset_t regs; | |
548 | struct iovec iovec; | |
549 | ||
550 | tid = get_thread_id (inferior_ptid); | |
551 | ||
552 | iovec.iov_base = ®s; | |
553 | iovec.iov_len = sizeof (regs); | |
554 | ||
555 | ret = ptrace (PTRACE_GETREGSET, tid, NT_FPREGSET, &iovec); | |
556 | if (ret < 0) | |
557 | perror_with_name (_("Unable to fetch FP/SIMD registers.")); | |
558 | ||
559 | for (regno = AARCH64_V0_REGNUM; regno <= AARCH64_V31_REGNUM; regno++) | |
560 | if (REG_VALID == regcache_register_status (regcache, regno)) | |
561 | regcache_raw_collect (regcache, regno, | |
562 | (char *) ®s.vregs[regno - AARCH64_V0_REGNUM]); | |
563 | ||
564 | if (REG_VALID == regcache_register_status (regcache, AARCH64_FPSR_REGNUM)) | |
565 | regcache_raw_collect (regcache, AARCH64_FPSR_REGNUM, (char *) ®s.fpsr); | |
566 | if (REG_VALID == regcache_register_status (regcache, AARCH64_FPCR_REGNUM)) | |
567 | regcache_raw_collect (regcache, AARCH64_FPCR_REGNUM, (char *) ®s.fpcr); | |
568 | ||
569 | ret = ptrace (PTRACE_SETREGSET, tid, NT_FPREGSET, &iovec); | |
570 | if (ret < 0) | |
571 | perror_with_name (_("Unable to store FP/SIMD registers.")); | |
572 | } | |
573 | ||
574 | /* Implement the "to_fetch_register" target_ops method. */ | |
575 | ||
576 | static void | |
577 | aarch64_linux_fetch_inferior_registers (struct target_ops *ops, | |
578 | struct regcache *regcache, | |
579 | int regno) | |
580 | { | |
581 | if (regno == -1) | |
582 | { | |
583 | fetch_gregs_from_thread (regcache); | |
584 | fetch_fpregs_from_thread (regcache); | |
585 | } | |
586 | else if (regno < AARCH64_V0_REGNUM) | |
587 | fetch_gregs_from_thread (regcache); | |
588 | else | |
589 | fetch_fpregs_from_thread (regcache); | |
590 | } | |
591 | ||
592 | /* Implement the "to_store_register" target_ops method. */ | |
593 | ||
594 | static void | |
595 | aarch64_linux_store_inferior_registers (struct target_ops *ops, | |
596 | struct regcache *regcache, | |
597 | int regno) | |
598 | { | |
599 | if (regno == -1) | |
600 | { | |
601 | store_gregs_to_thread (regcache); | |
602 | store_fpregs_to_thread (regcache); | |
603 | } | |
604 | else if (regno < AARCH64_V0_REGNUM) | |
605 | store_gregs_to_thread (regcache); | |
606 | else | |
607 | store_fpregs_to_thread (regcache); | |
608 | } | |
609 | ||
610 | /* Fill register REGNO (if it is a general-purpose register) in | |
611 | *GREGSETPS with the value in GDB's register array. If REGNO is -1, | |
612 | do this for all registers. */ | |
613 | ||
614 | void | |
615 | fill_gregset (const struct regcache *regcache, | |
616 | gdb_gregset_t *gregsetp, int regno) | |
617 | { | |
618 | gdb_byte *gregs_buf = (gdb_byte *) gregsetp; | |
619 | int i; | |
620 | ||
621 | for (i = AARCH64_X0_REGNUM; i <= AARCH64_CPSR_REGNUM; i++) | |
622 | if (regno == -1 || regno == i) | |
623 | regcache_raw_collect (regcache, i, | |
624 | gregs_buf + X_REGISTER_SIZE | |
625 | * (i - AARCH64_X0_REGNUM)); | |
626 | } | |
627 | ||
628 | /* Fill GDB's register array with the general-purpose register values | |
629 | in *GREGSETP. */ | |
630 | ||
631 | void | |
632 | supply_gregset (struct regcache *regcache, const gdb_gregset_t *gregsetp) | |
633 | { | |
634 | aarch64_linux_supply_gregset (regcache, (const gdb_byte *) gregsetp); | |
635 | } | |
636 | ||
637 | /* Fill register REGNO (if it is a floating-point register) in | |
638 | *FPREGSETP with the value in GDB's register array. If REGNO is -1, | |
639 | do this for all registers. */ | |
640 | ||
641 | void | |
642 | fill_fpregset (const struct regcache *regcache, | |
643 | gdb_fpregset_t *fpregsetp, int regno) | |
644 | { | |
645 | gdb_byte *fpregs_buf = (gdb_byte *) fpregsetp; | |
646 | int i; | |
647 | ||
648 | for (i = AARCH64_V0_REGNUM; i <= AARCH64_V31_REGNUM; i++) | |
649 | if (regno == -1 || regno == i) | |
650 | regcache_raw_collect (regcache, i, | |
651 | fpregs_buf + V_REGISTER_SIZE | |
652 | * (i - AARCH64_V0_REGNUM)); | |
653 | ||
654 | if (regno == -1 || regno == AARCH64_FPSR_REGNUM) | |
655 | regcache_raw_collect (regcache, AARCH64_FPSR_REGNUM, | |
656 | fpregs_buf + V_REGISTER_SIZE * 32); | |
657 | ||
658 | if (regno == -1 || regno == AARCH64_FPCR_REGNUM) | |
659 | regcache_raw_collect (regcache, AARCH64_FPCR_REGNUM, | |
660 | fpregs_buf + V_REGISTER_SIZE * 32 + 4); | |
661 | } | |
662 | ||
663 | /* Fill GDB's register array with the floating-point register values | |
664 | in *FPREGSETP. */ | |
665 | ||
666 | void | |
667 | supply_fpregset (struct regcache *regcache, const gdb_fpregset_t *fpregsetp) | |
668 | { | |
669 | aarch64_linux_supply_fpregset (regcache, (const gdb_byte *) fpregsetp); | |
670 | } | |
671 | ||
672 | /* Called when resuming a thread. | |
673 | The hardware debug registers are updated when there is any change. */ | |
674 | ||
675 | static void | |
676 | aarch64_linux_prepare_to_resume (struct lwp_info *lwp) | |
677 | { | |
678 | struct arch_lwp_info *info = lwp->arch_private; | |
679 | ||
680 | /* NULL means this is the main thread still going through the shell, | |
681 | or, no watchpoint has been set yet. In that case, there's | |
682 | nothing to do. */ | |
683 | if (info == NULL) | |
684 | return; | |
685 | ||
686 | if (DR_HAS_CHANGED (info->dr_changed_bp) | |
687 | || DR_HAS_CHANGED (info->dr_changed_wp)) | |
688 | { | |
dfd4cc63 | 689 | int tid = ptid_get_lwp (lwp->ptid); |
d6c44983 YZ |
690 | struct aarch64_debug_reg_state *state |
691 | = aarch64_get_debug_reg_state (ptid_get_pid (lwp->ptid)); | |
9d19df75 MS |
692 | |
693 | if (debug_hw_points) | |
694 | fprintf_unfiltered (gdb_stdlog, "prepare_to_resume thread %d\n", tid); | |
695 | ||
696 | /* Watchpoints. */ | |
697 | if (DR_HAS_CHANGED (info->dr_changed_wp)) | |
698 | { | |
699 | aarch64_linux_set_debug_regs (state, tid, 1); | |
700 | DR_CLEAR_CHANGED (info->dr_changed_wp); | |
701 | } | |
702 | ||
703 | /* Breakpoints. */ | |
704 | if (DR_HAS_CHANGED (info->dr_changed_bp)) | |
705 | { | |
706 | aarch64_linux_set_debug_regs (state, tid, 0); | |
707 | DR_CLEAR_CHANGED (info->dr_changed_bp); | |
708 | } | |
709 | } | |
710 | } | |
711 | ||
712 | static void | |
713 | aarch64_linux_new_thread (struct lwp_info *lp) | |
714 | { | |
715 | struct arch_lwp_info *info = XCNEW (struct arch_lwp_info); | |
716 | ||
717 | /* Mark that all the hardware breakpoint/watchpoint register pairs | |
718 | for this thread need to be initialized. */ | |
719 | DR_MARK_ALL_CHANGED (info->dr_changed_bp, aarch64_num_bp_regs); | |
720 | DR_MARK_ALL_CHANGED (info->dr_changed_wp, aarch64_num_wp_regs); | |
721 | ||
722 | lp->arch_private = info; | |
723 | } | |
d6c44983 YZ |
724 | |
725 | /* linux_nat_new_fork hook. */ | |
726 | ||
727 | static void | |
728 | aarch64_linux_new_fork (struct lwp_info *parent, pid_t child_pid) | |
729 | { | |
730 | pid_t parent_pid; | |
731 | struct aarch64_debug_reg_state *parent_state; | |
732 | struct aarch64_debug_reg_state *child_state; | |
733 | ||
734 | /* NULL means no watchpoint has ever been set in the parent. In | |
735 | that case, there's nothing to do. */ | |
736 | if (parent->arch_private == NULL) | |
737 | return; | |
738 | ||
739 | /* GDB core assumes the child inherits the watchpoints/hw | |
740 | breakpoints of the parent, and will remove them all from the | |
741 | forked off process. Copy the debug registers mirrors into the | |
742 | new process so that all breakpoints and watchpoints can be | |
743 | removed together. */ | |
744 | ||
745 | parent_pid = ptid_get_pid (parent->ptid); | |
746 | parent_state = aarch64_get_debug_reg_state (parent_pid); | |
747 | child_state = aarch64_get_debug_reg_state (child_pid); | |
748 | *child_state = *parent_state; | |
749 | } | |
9d19df75 MS |
750 | \f |
751 | ||
752 | /* Called by libthread_db. Returns a pointer to the thread local | |
753 | storage (or its descriptor). */ | |
754 | ||
755 | ps_err_e | |
756 | ps_get_thread_area (const struct ps_prochandle *ph, | |
757 | lwpid_t lwpid, int idx, void **base) | |
758 | { | |
759 | struct iovec iovec; | |
760 | uint64_t reg; | |
761 | ||
762 | iovec.iov_base = ® | |
763 | iovec.iov_len = sizeof (reg); | |
764 | ||
765 | if (ptrace (PTRACE_GETREGSET, lwpid, NT_ARM_TLS, &iovec) != 0) | |
766 | return PS_ERR; | |
767 | ||
768 | /* IDX is the bias from the thread pointer to the beginning of the | |
769 | thread descriptor. It has to be subtracted due to implementation | |
770 | quirks in libthread_db. */ | |
771 | *base = (void *) (reg - idx); | |
772 | ||
773 | return PS_OK; | |
774 | } | |
775 | \f | |
776 | ||
777 | /* Get the hardware debug register capacity information. */ | |
778 | ||
779 | static void | |
780 | aarch64_linux_get_debug_reg_capacity (void) | |
781 | { | |
782 | int tid; | |
783 | struct iovec iov; | |
784 | struct user_hwdebug_state dreg_state; | |
785 | ||
786 | tid = get_thread_id (inferior_ptid); | |
787 | iov.iov_base = &dreg_state; | |
788 | iov.iov_len = sizeof (dreg_state); | |
789 | ||
790 | /* Get hardware watchpoint register info. */ | |
791 | if (ptrace (PTRACE_GETREGSET, tid, NT_ARM_HW_WATCH, &iov) == 0 | |
792 | && AARCH64_DEBUG_ARCH (dreg_state.dbg_info) == AARCH64_DEBUG_ARCH_V8) | |
793 | { | |
794 | aarch64_num_wp_regs = AARCH64_DEBUG_NUM_SLOTS (dreg_state.dbg_info); | |
795 | if (aarch64_num_wp_regs > AARCH64_HWP_MAX_NUM) | |
796 | { | |
1d3ffd6b MS |
797 | warning (_("Unexpected number of hardware watchpoint registers" |
798 | " reported by ptrace, got %d, expected %d."), | |
9d19df75 MS |
799 | aarch64_num_wp_regs, AARCH64_HWP_MAX_NUM); |
800 | aarch64_num_wp_regs = AARCH64_HWP_MAX_NUM; | |
801 | } | |
802 | } | |
803 | else | |
804 | { | |
1d3ffd6b MS |
805 | warning (_("Unable to determine the number of hardware watchpoints" |
806 | " available.")); | |
9d19df75 MS |
807 | aarch64_num_wp_regs = 0; |
808 | } | |
809 | ||
810 | /* Get hardware breakpoint register info. */ | |
811 | if (ptrace (PTRACE_GETREGSET, tid, NT_ARM_HW_BREAK, &iov) == 0 | |
812 | && AARCH64_DEBUG_ARCH (dreg_state.dbg_info) == AARCH64_DEBUG_ARCH_V8) | |
813 | { | |
814 | aarch64_num_bp_regs = AARCH64_DEBUG_NUM_SLOTS (dreg_state.dbg_info); | |
815 | if (aarch64_num_bp_regs > AARCH64_HBP_MAX_NUM) | |
816 | { | |
1d3ffd6b MS |
817 | warning (_("Unexpected number of hardware breakpoint registers" |
818 | " reported by ptrace, got %d, expected %d."), | |
9d19df75 MS |
819 | aarch64_num_bp_regs, AARCH64_HBP_MAX_NUM); |
820 | aarch64_num_bp_regs = AARCH64_HBP_MAX_NUM; | |
821 | } | |
822 | } | |
823 | else | |
824 | { | |
1d3ffd6b MS |
825 | warning (_("Unable to determine the number of hardware breakpoints" |
826 | " available.")); | |
9d19df75 MS |
827 | aarch64_num_bp_regs = 0; |
828 | } | |
829 | } | |
830 | ||
831 | static void (*super_post_startup_inferior) (ptid_t ptid); | |
832 | ||
833 | /* Implement the "to_post_startup_inferior" target_ops method. */ | |
834 | ||
835 | static void | |
836 | aarch64_linux_child_post_startup_inferior (ptid_t ptid) | |
837 | { | |
d6c44983 | 838 | aarch64_forget_process (ptid_get_pid (ptid)); |
9d19df75 MS |
839 | aarch64_linux_get_debug_reg_capacity (); |
840 | super_post_startup_inferior (ptid); | |
841 | } | |
842 | ||
843 | /* Implement the "to_read_description" target_ops method. */ | |
844 | ||
845 | static const struct target_desc * | |
846 | aarch64_linux_read_description (struct target_ops *ops) | |
847 | { | |
848 | initialize_tdesc_aarch64 (); | |
849 | return tdesc_aarch64; | |
850 | } | |
851 | ||
852 | /* Given the (potentially unaligned) watchpoint address in ADDR and | |
853 | length in LEN, return the aligned address and aligned length in | |
854 | *ALIGNED_ADDR_P and *ALIGNED_LEN_P, respectively. The returned | |
855 | aligned address and length will be valid values to write to the | |
856 | hardware watchpoint value and control registers. | |
857 | ||
858 | The given watchpoint may get truncated if more than one hardware | |
859 | register is needed to cover the watched region. *NEXT_ADDR_P | |
860 | and *NEXT_LEN_P, if non-NULL, will return the address and length | |
861 | of the remaining part of the watchpoint (which can be processed | |
862 | by calling this routine again to generate another aligned address | |
863 | and length pair. | |
864 | ||
865 | See the comment above the function of the same name in | |
866 | gdbserver/linux-aarch64-low.c for more information. */ | |
867 | ||
868 | static void | |
869 | aarch64_align_watchpoint (CORE_ADDR addr, int len, CORE_ADDR *aligned_addr_p, | |
870 | int *aligned_len_p, CORE_ADDR *next_addr_p, | |
871 | int *next_len_p) | |
872 | { | |
873 | int aligned_len; | |
874 | unsigned int offset; | |
875 | CORE_ADDR aligned_addr; | |
876 | const unsigned int alignment = AARCH64_HWP_ALIGNMENT; | |
877 | const unsigned int max_wp_len = AARCH64_HWP_MAX_LEN_PER_REG; | |
878 | ||
879 | /* As assumed by the algorithm. */ | |
880 | gdb_assert (alignment == max_wp_len); | |
881 | ||
882 | if (len <= 0) | |
883 | return; | |
884 | ||
885 | /* Address to be put into the hardware watchpoint value register | |
886 | must be aligned. */ | |
887 | offset = addr & (alignment - 1); | |
888 | aligned_addr = addr - offset; | |
889 | ||
890 | gdb_assert (offset >= 0 && offset < alignment); | |
891 | gdb_assert (aligned_addr >= 0 && aligned_addr <= addr); | |
892 | gdb_assert (offset + len > 0); | |
893 | ||
894 | if (offset + len >= max_wp_len) | |
895 | { | |
896 | /* Need more than one watchpoint registers; truncate it at the | |
897 | alignment boundary. */ | |
898 | aligned_len = max_wp_len; | |
899 | len -= (max_wp_len - offset); | |
900 | addr += (max_wp_len - offset); | |
901 | gdb_assert ((addr & (alignment - 1)) == 0); | |
902 | } | |
903 | else | |
904 | { | |
905 | /* Find the smallest valid length that is large enough to | |
906 | accommodate this watchpoint. */ | |
907 | static const unsigned char | |
908 | aligned_len_array[AARCH64_HWP_MAX_LEN_PER_REG] = | |
909 | { 1, 2, 4, 4, 8, 8, 8, 8 }; | |
910 | ||
911 | aligned_len = aligned_len_array[offset + len - 1]; | |
912 | addr += len; | |
913 | len = 0; | |
914 | } | |
915 | ||
916 | if (aligned_addr_p) | |
917 | *aligned_addr_p = aligned_addr; | |
918 | if (aligned_len_p) | |
919 | *aligned_len_p = aligned_len; | |
920 | if (next_addr_p) | |
921 | *next_addr_p = addr; | |
922 | if (next_len_p) | |
923 | *next_len_p = len; | |
924 | } | |
925 | ||
926 | /* Returns the number of hardware watchpoints of type TYPE that we can | |
927 | set. Value is positive if we can set CNT watchpoints, zero if | |
928 | setting watchpoints of type TYPE is not supported, and negative if | |
929 | CNT is more than the maximum number of watchpoints of type TYPE | |
930 | that we can support. TYPE is one of bp_hardware_watchpoint, | |
931 | bp_read_watchpoint, bp_write_watchpoint, or bp_hardware_breakpoint. | |
932 | CNT is the number of such watchpoints used so far (including this | |
933 | one). OTHERTYPE is non-zero if other types of watchpoints are | |
934 | currently enabled. | |
935 | ||
936 | We always return 1 here because we don't have enough information | |
937 | about possible overlap of addresses that they want to watch. As an | |
938 | extreme example, consider the case where all the watchpoints watch | |
939 | the same address and the same region length: then we can handle a | |
940 | virtually unlimited number of watchpoints, due to debug register | |
941 | sharing implemented via reference counts. */ | |
942 | ||
943 | static int | |
944 | aarch64_linux_can_use_hw_breakpoint (int type, int cnt, int othertype) | |
945 | { | |
946 | return 1; | |
947 | } | |
948 | ||
949 | /* ptrace expects control registers to be formatted as follows: | |
950 | ||
951 | 31 13 5 3 1 0 | |
952 | +--------------------------------+----------+------+------+----+ | |
953 | | RESERVED (SBZ) | LENGTH | TYPE | PRIV | EN | | |
954 | +--------------------------------+----------+------+------+----+ | |
955 | ||
956 | The TYPE field is ignored for breakpoints. */ | |
957 | ||
958 | #define DR_CONTROL_ENABLED(ctrl) (((ctrl) & 0x1) == 1) | |
959 | #define DR_CONTROL_LENGTH(ctrl) (((ctrl) >> 5) & 0xff) | |
960 | ||
961 | /* Utility function that returns the length in bytes of a watchpoint | |
962 | according to the content of a hardware debug control register CTRL. | |
963 | Note that the kernel currently only supports the following Byte | |
964 | Address Select (BAS) values: 0x1, 0x3, 0xf and 0xff, which means | |
965 | that for a hardware watchpoint, its valid length can only be 1 | |
966 | byte, 2 bytes, 4 bytes or 8 bytes. */ | |
967 | ||
968 | static inline unsigned int | |
969 | aarch64_watchpoint_length (unsigned int ctrl) | |
970 | { | |
971 | switch (DR_CONTROL_LENGTH (ctrl)) | |
972 | { | |
973 | case 0x01: | |
974 | return 1; | |
975 | case 0x03: | |
976 | return 2; | |
977 | case 0x0f: | |
978 | return 4; | |
979 | case 0xff: | |
980 | return 8; | |
981 | default: | |
982 | return 0; | |
983 | } | |
984 | } | |
985 | ||
986 | /* Given the hardware breakpoint or watchpoint type TYPE and its | |
987 | length LEN, return the expected encoding for a hardware | |
988 | breakpoint/watchpoint control register. */ | |
989 | ||
990 | static unsigned int | |
991 | aarch64_point_encode_ctrl_reg (int type, int len) | |
992 | { | |
993 | unsigned int ctrl, ttype; | |
994 | ||
995 | /* type */ | |
996 | switch (type) | |
997 | { | |
998 | case hw_write: | |
999 | ttype = 2; | |
1000 | break; | |
1001 | case hw_read: | |
1002 | ttype = 1; | |
1003 | break; | |
1004 | case hw_access: | |
1005 | ttype = 3; | |
1006 | break; | |
1007 | case hw_execute: | |
1008 | ttype = 0; | |
1009 | break; | |
1010 | default: | |
1011 | perror_with_name (_("Unrecognized breakpoint/watchpoint type")); | |
1012 | } | |
1013 | ctrl = ttype << 3; | |
1014 | ||
1015 | /* length bitmask */ | |
1016 | ctrl |= ((1 << len) - 1) << 5; | |
1017 | /* enabled at el0 */ | |
1018 | ctrl |= (2 << 1) | 1; | |
1019 | ||
1020 | return ctrl; | |
1021 | } | |
1022 | ||
1023 | /* Addresses to be written to the hardware breakpoint and watchpoint | |
1024 | value registers need to be aligned; the alignment is 4-byte and | |
1025 | 8-type respectively. Linux kernel rejects any non-aligned address | |
1026 | it receives from the related ptrace call. Furthermore, the kernel | |
1027 | currently only supports the following Byte Address Select (BAS) | |
1028 | values: 0x1, 0x3, 0xf and 0xff, which means that for a hardware | |
1029 | watchpoint to be accepted by the kernel (via ptrace call), its | |
1030 | valid length can only be 1 byte, 2 bytes, 4 bytes or 8 bytes. | |
1031 | Despite these limitations, the unaligned watchpoint is supported in | |
1032 | this port. | |
1033 | ||
1034 | Return 0 for any non-compliant ADDR and/or LEN; return 1 otherwise. */ | |
1035 | ||
1036 | static int | |
1037 | aarch64_point_is_aligned (int is_watchpoint, CORE_ADDR addr, int len) | |
1038 | { | |
1039 | unsigned int alignment = is_watchpoint ? AARCH64_HWP_ALIGNMENT | |
1040 | : AARCH64_HBP_ALIGNMENT; | |
1041 | ||
1042 | if (addr & (alignment - 1)) | |
1043 | return 0; | |
1044 | ||
1045 | if (len != 8 && len != 4 && len != 2 && len != 1) | |
1046 | return 0; | |
1047 | ||
1048 | return 1; | |
1049 | } | |
1050 | ||
1051 | /* Record the insertion of one breakpoint/watchpoint, as represented | |
1052 | by ADDR and CTRL, in the cached debug register state area *STATE. */ | |
1053 | ||
1054 | static int | |
1055 | aarch64_dr_state_insert_one_point (struct aarch64_debug_reg_state *state, | |
1056 | int type, CORE_ADDR addr, int len) | |
1057 | { | |
1058 | int i, idx, num_regs, is_watchpoint; | |
1059 | unsigned int ctrl, *dr_ctrl_p, *dr_ref_count; | |
1060 | CORE_ADDR *dr_addr_p; | |
1061 | ||
1062 | /* Set up state pointers. */ | |
1063 | is_watchpoint = (type != hw_execute); | |
1064 | gdb_assert (aarch64_point_is_aligned (is_watchpoint, addr, len)); | |
1065 | if (is_watchpoint) | |
1066 | { | |
1067 | num_regs = aarch64_num_wp_regs; | |
1068 | dr_addr_p = state->dr_addr_wp; | |
1069 | dr_ctrl_p = state->dr_ctrl_wp; | |
1070 | dr_ref_count = state->dr_ref_count_wp; | |
1071 | } | |
1072 | else | |
1073 | { | |
1074 | num_regs = aarch64_num_bp_regs; | |
1075 | dr_addr_p = state->dr_addr_bp; | |
1076 | dr_ctrl_p = state->dr_ctrl_bp; | |
1077 | dr_ref_count = state->dr_ref_count_bp; | |
1078 | } | |
1079 | ||
1080 | ctrl = aarch64_point_encode_ctrl_reg (type, len); | |
1081 | ||
1082 | /* Find an existing or free register in our cache. */ | |
1083 | idx = -1; | |
1084 | for (i = 0; i < num_regs; ++i) | |
1085 | { | |
1086 | if ((dr_ctrl_p[i] & 1) == 0) | |
1087 | { | |
1088 | gdb_assert (dr_ref_count[i] == 0); | |
1089 | idx = i; | |
1090 | /* no break; continue hunting for an existing one. */ | |
1091 | } | |
1092 | else if (dr_addr_p[i] == addr && dr_ctrl_p[i] == ctrl) | |
1093 | { | |
1094 | gdb_assert (dr_ref_count[i] != 0); | |
1095 | idx = i; | |
1096 | break; | |
1097 | } | |
1098 | } | |
1099 | ||
1100 | /* No space. */ | |
1101 | if (idx == -1) | |
1102 | return -1; | |
1103 | ||
1104 | /* Update our cache. */ | |
1105 | if ((dr_ctrl_p[idx] & 1) == 0) | |
1106 | { | |
1107 | /* new entry */ | |
1108 | dr_addr_p[idx] = addr; | |
1109 | dr_ctrl_p[idx] = ctrl; | |
1110 | dr_ref_count[idx] = 1; | |
1111 | /* Notify the change. */ | |
1112 | aarch64_notify_debug_reg_change (state, is_watchpoint, idx); | |
1113 | } | |
1114 | else | |
1115 | { | |
1116 | /* existing entry */ | |
1117 | dr_ref_count[idx]++; | |
1118 | } | |
1119 | ||
1120 | return 0; | |
1121 | } | |
1122 | ||
1123 | /* Record the removal of one breakpoint/watchpoint, as represented by | |
1124 | ADDR and CTRL, in the cached debug register state area *STATE. */ | |
1125 | ||
1126 | static int | |
1127 | aarch64_dr_state_remove_one_point (struct aarch64_debug_reg_state *state, | |
1128 | int type, CORE_ADDR addr, int len) | |
1129 | { | |
1130 | int i, num_regs, is_watchpoint; | |
1131 | unsigned int ctrl, *dr_ctrl_p, *dr_ref_count; | |
1132 | CORE_ADDR *dr_addr_p; | |
1133 | ||
1134 | /* Set up state pointers. */ | |
1135 | is_watchpoint = (type != hw_execute); | |
1136 | gdb_assert (aarch64_point_is_aligned (is_watchpoint, addr, len)); | |
1137 | if (is_watchpoint) | |
1138 | { | |
1139 | num_regs = aarch64_num_wp_regs; | |
1140 | dr_addr_p = state->dr_addr_wp; | |
1141 | dr_ctrl_p = state->dr_ctrl_wp; | |
1142 | dr_ref_count = state->dr_ref_count_wp; | |
1143 | } | |
1144 | else | |
1145 | { | |
1146 | num_regs = aarch64_num_bp_regs; | |
1147 | dr_addr_p = state->dr_addr_bp; | |
1148 | dr_ctrl_p = state->dr_ctrl_bp; | |
1149 | dr_ref_count = state->dr_ref_count_bp; | |
1150 | } | |
1151 | ||
1152 | ctrl = aarch64_point_encode_ctrl_reg (type, len); | |
1153 | ||
1154 | /* Find the entry that matches the ADDR and CTRL. */ | |
1155 | for (i = 0; i < num_regs; ++i) | |
1156 | if (dr_addr_p[i] == addr && dr_ctrl_p[i] == ctrl) | |
1157 | { | |
1158 | gdb_assert (dr_ref_count[i] != 0); | |
1159 | break; | |
1160 | } | |
1161 | ||
1162 | /* Not found. */ | |
1163 | if (i == num_regs) | |
1164 | return -1; | |
1165 | ||
1166 | /* Clear our cache. */ | |
1167 | if (--dr_ref_count[i] == 0) | |
1168 | { | |
1169 | /* Clear the enable bit. */ | |
1170 | ctrl &= ~1; | |
1171 | dr_addr_p[i] = 0; | |
1172 | dr_ctrl_p[i] = ctrl; | |
1173 | /* Notify the change. */ | |
1174 | aarch64_notify_debug_reg_change (state, is_watchpoint, i); | |
1175 | } | |
1176 | ||
1177 | return 0; | |
1178 | } | |
1179 | ||
1180 | /* Implement insertion and removal of a single breakpoint. */ | |
1181 | ||
1182 | static int | |
1183 | aarch64_handle_breakpoint (int type, CORE_ADDR addr, int len, int is_insert) | |
1184 | { | |
1185 | struct aarch64_debug_reg_state *state; | |
1186 | ||
1187 | /* The hardware breakpoint on AArch64 should always be 4-byte | |
1188 | aligned. */ | |
1189 | if (!aarch64_point_is_aligned (0 /* is_watchpoint */ , addr, len)) | |
1190 | return -1; | |
1191 | ||
d6c44983 | 1192 | state = aarch64_get_debug_reg_state (ptid_get_pid (inferior_ptid)); |
9d19df75 MS |
1193 | |
1194 | if (is_insert) | |
1195 | return aarch64_dr_state_insert_one_point (state, type, addr, len); | |
1196 | else | |
1197 | return aarch64_dr_state_remove_one_point (state, type, addr, len); | |
1198 | } | |
1199 | ||
1200 | /* Insert a hardware-assisted breakpoint at BP_TGT->placed_address. | |
1201 | Return 0 on success, -1 on failure. */ | |
1202 | ||
1203 | static int | |
1204 | aarch64_linux_insert_hw_breakpoint (struct gdbarch *gdbarch, | |
1205 | struct bp_target_info *bp_tgt) | |
1206 | { | |
1207 | int ret; | |
1208 | CORE_ADDR addr = bp_tgt->placed_address; | |
1209 | const int len = 4; | |
1210 | const int type = hw_execute; | |
1211 | ||
1212 | if (debug_hw_points) | |
1213 | fprintf_unfiltered | |
1214 | (gdb_stdlog, | |
1215 | "insert_hw_breakpoint on entry (addr=0x%08lx, len=%d))\n", | |
1216 | (unsigned long) addr, len); | |
1217 | ||
1218 | ret = aarch64_handle_breakpoint (type, addr, len, 1 /* is_insert */); | |
1219 | ||
1220 | if (debug_hw_points > 1) | |
d6c44983 YZ |
1221 | { |
1222 | struct aarch64_debug_reg_state *state | |
1223 | = aarch64_get_debug_reg_state (ptid_get_pid (inferior_ptid)); | |
1224 | ||
1225 | aarch64_show_debug_reg_state (state, | |
1226 | "insert_hw_watchpoint", addr, len, type); | |
1227 | } | |
9d19df75 MS |
1228 | |
1229 | return ret; | |
1230 | } | |
1231 | ||
1232 | /* Remove a hardware-assisted breakpoint at BP_TGT->placed_address. | |
1233 | Return 0 on success, -1 on failure. */ | |
1234 | ||
1235 | static int | |
1236 | aarch64_linux_remove_hw_breakpoint (struct gdbarch *gdbarch, | |
1237 | struct bp_target_info *bp_tgt) | |
1238 | { | |
1239 | int ret; | |
1240 | CORE_ADDR addr = bp_tgt->placed_address; | |
1241 | const int len = 4; | |
1242 | const int type = hw_execute; | |
1243 | ||
1244 | if (debug_hw_points) | |
1245 | fprintf_unfiltered | |
1246 | (gdb_stdlog, "remove_hw_breakpoint on entry (addr=0x%08lx, len=%d))\n", | |
1247 | (unsigned long) addr, len); | |
1248 | ||
1249 | ret = aarch64_handle_breakpoint (type, addr, len, 0 /* is_insert */); | |
1250 | ||
1251 | if (debug_hw_points > 1) | |
d6c44983 YZ |
1252 | { |
1253 | struct aarch64_debug_reg_state *state | |
1254 | = aarch64_get_debug_reg_state (ptid_get_pid (inferior_ptid)); | |
1255 | ||
1256 | aarch64_show_debug_reg_state (state, | |
1257 | "remove_hw_watchpoint", addr, len, type); | |
1258 | } | |
9d19df75 MS |
1259 | |
1260 | return ret; | |
1261 | } | |
1262 | ||
1263 | /* This is essentially the same as aarch64_handle_breakpoint, apart | |
1264 | from that it is an aligned watchpoint to be handled. */ | |
1265 | ||
1266 | static int | |
1267 | aarch64_handle_aligned_watchpoint (int type, CORE_ADDR addr, int len, | |
1268 | int is_insert) | |
1269 | { | |
d6c44983 YZ |
1270 | struct aarch64_debug_reg_state *state |
1271 | = aarch64_get_debug_reg_state (ptid_get_pid (inferior_ptid)); | |
9d19df75 MS |
1272 | |
1273 | if (is_insert) | |
1274 | return aarch64_dr_state_insert_one_point (state, type, addr, len); | |
1275 | else | |
1276 | return aarch64_dr_state_remove_one_point (state, type, addr, len); | |
1277 | } | |
1278 | ||
1279 | /* Insert/remove unaligned watchpoint by calling | |
1280 | aarch64_align_watchpoint repeatedly until the whole watched region, | |
1281 | as represented by ADDR and LEN, has been properly aligned and ready | |
1282 | to be written to one or more hardware watchpoint registers. | |
1283 | IS_INSERT indicates whether this is an insertion or a deletion. | |
1284 | Return 0 if succeed. */ | |
1285 | ||
1286 | static int | |
1287 | aarch64_handle_unaligned_watchpoint (int type, CORE_ADDR addr, int len, | |
1288 | int is_insert) | |
1289 | { | |
d6c44983 YZ |
1290 | struct aarch64_debug_reg_state *state |
1291 | = aarch64_get_debug_reg_state (ptid_get_pid (inferior_ptid)); | |
9d19df75 MS |
1292 | |
1293 | while (len > 0) | |
1294 | { | |
1295 | CORE_ADDR aligned_addr; | |
1296 | int aligned_len, ret; | |
1297 | ||
1298 | aarch64_align_watchpoint (addr, len, &aligned_addr, &aligned_len, | |
1299 | &addr, &len); | |
1300 | ||
1301 | if (is_insert) | |
1302 | ret = aarch64_dr_state_insert_one_point (state, type, aligned_addr, | |
1303 | aligned_len); | |
1304 | else | |
1305 | ret = aarch64_dr_state_remove_one_point (state, type, aligned_addr, | |
1306 | aligned_len); | |
1307 | ||
1308 | if (debug_hw_points) | |
1309 | fprintf_unfiltered (gdb_stdlog, | |
1310 | "handle_unaligned_watchpoint: is_insert: %d\n" | |
1311 | " aligned_addr: 0x%08lx, aligned_len: %d\n" | |
1312 | " next_addr: 0x%08lx, next_len: %d\n", | |
1313 | is_insert, aligned_addr, aligned_len, addr, len); | |
1314 | ||
1315 | if (ret != 0) | |
1316 | return ret; | |
1317 | } | |
1318 | ||
1319 | return 0; | |
1320 | } | |
1321 | ||
1322 | /* Implements insertion and removal of a single watchpoint. */ | |
1323 | ||
1324 | static int | |
1325 | aarch64_handle_watchpoint (int type, CORE_ADDR addr, int len, int is_insert) | |
1326 | { | |
1327 | if (aarch64_point_is_aligned (1 /* is_watchpoint */ , addr, len)) | |
1328 | return aarch64_handle_aligned_watchpoint (type, addr, len, is_insert); | |
1329 | else | |
1330 | return aarch64_handle_unaligned_watchpoint (type, addr, len, is_insert); | |
1331 | } | |
1332 | ||
1333 | /* Implement the "to_insert_watchpoint" target_ops method. | |
1334 | ||
1335 | Insert a watchpoint to watch a memory region which starts at | |
1336 | address ADDR and whose length is LEN bytes. Watch memory accesses | |
1337 | of the type TYPE. Return 0 on success, -1 on failure. */ | |
1338 | ||
1339 | static int | |
1340 | aarch64_linux_insert_watchpoint (CORE_ADDR addr, int len, int type, | |
1341 | struct expression *cond) | |
1342 | { | |
1343 | int ret; | |
1344 | ||
1345 | if (debug_hw_points) | |
1346 | fprintf_unfiltered (gdb_stdlog, | |
1347 | "insert_watchpoint on entry (addr=0x%08lx, len=%d)\n", | |
1348 | (unsigned long) addr, len); | |
1349 | ||
1350 | gdb_assert (type != hw_execute); | |
1351 | ||
1352 | ret = aarch64_handle_watchpoint (type, addr, len, 1 /* is_insert */); | |
1353 | ||
1354 | if (debug_hw_points > 1) | |
d6c44983 YZ |
1355 | { |
1356 | struct aarch64_debug_reg_state *state | |
1357 | = aarch64_get_debug_reg_state (ptid_get_pid (inferior_ptid)); | |
1358 | ||
1359 | aarch64_show_debug_reg_state (state, | |
1360 | "insert_watchpoint", addr, len, type); | |
1361 | } | |
9d19df75 MS |
1362 | |
1363 | return ret; | |
1364 | } | |
1365 | ||
1366 | /* Implement the "to_remove_watchpoint" target_ops method. | |
1367 | Remove a watchpoint that watched the memory region which starts at | |
1368 | address ADDR, whose length is LEN bytes, and for accesses of the | |
1369 | type TYPE. Return 0 on success, -1 on failure. */ | |
1370 | ||
1371 | static int | |
1372 | aarch64_linux_remove_watchpoint (CORE_ADDR addr, int len, int type, | |
1373 | struct expression *cond) | |
1374 | { | |
1375 | int ret; | |
1376 | ||
1377 | if (debug_hw_points) | |
1378 | fprintf_unfiltered (gdb_stdlog, | |
1379 | "remove_watchpoint on entry (addr=0x%08lx, len=%d)\n", | |
1380 | (unsigned long) addr, len); | |
1381 | ||
1382 | gdb_assert (type != hw_execute); | |
1383 | ||
1384 | ret = aarch64_handle_watchpoint (type, addr, len, 0 /* is_insert */); | |
1385 | ||
1386 | if (debug_hw_points > 1) | |
d6c44983 YZ |
1387 | { |
1388 | struct aarch64_debug_reg_state *state | |
1389 | = aarch64_get_debug_reg_state (ptid_get_pid (inferior_ptid)); | |
1390 | ||
1391 | aarch64_show_debug_reg_state (state, | |
1392 | "remove_watchpoint", addr, len, type); | |
1393 | } | |
9d19df75 MS |
1394 | |
1395 | return ret; | |
1396 | } | |
1397 | ||
1398 | /* Implement the "to_region_ok_for_hw_watchpoint" target_ops method. */ | |
1399 | ||
1400 | static int | |
1401 | aarch64_linux_region_ok_for_hw_watchpoint (CORE_ADDR addr, int len) | |
1402 | { | |
1403 | CORE_ADDR aligned_addr; | |
1404 | ||
1405 | /* Can not set watchpoints for zero or negative lengths. */ | |
1406 | if (len <= 0) | |
1407 | return 0; | |
1408 | ||
1409 | /* Must have hardware watchpoint debug register(s). */ | |
1410 | if (aarch64_num_wp_regs == 0) | |
1411 | return 0; | |
1412 | ||
1413 | /* We support unaligned watchpoint address and arbitrary length, | |
1414 | as long as the size of the whole watched area after alignment | |
1415 | doesn't exceed size of the total area that all watchpoint debug | |
1416 | registers can watch cooperatively. | |
1417 | ||
1418 | This is a very relaxed rule, but unfortunately there are | |
1419 | limitations, e.g. false-positive hits, due to limited support of | |
1420 | hardware debug registers in the kernel. See comment above | |
1421 | aarch64_align_watchpoint for more information. */ | |
1422 | ||
1423 | aligned_addr = addr & ~(AARCH64_HWP_MAX_LEN_PER_REG - 1); | |
1424 | if (aligned_addr + aarch64_num_wp_regs * AARCH64_HWP_MAX_LEN_PER_REG | |
1425 | < addr + len) | |
1426 | return 0; | |
1427 | ||
1428 | /* All tests passed so we are likely to be able to set the watchpoint. | |
1429 | The reason that it is 'likely' rather than 'must' is because | |
1430 | we don't check the current usage of the watchpoint registers, and | |
1431 | there may not be enough registers available for this watchpoint. | |
1432 | Ideally we should check the cached debug register state, however | |
1433 | the checking is costly. */ | |
1434 | return 1; | |
1435 | } | |
1436 | ||
1437 | /* Implement the "to_stopped_data_address" target_ops method. */ | |
1438 | ||
1439 | static int | |
1440 | aarch64_linux_stopped_data_address (struct target_ops *target, | |
1441 | CORE_ADDR *addr_p) | |
1442 | { | |
1443 | siginfo_t siginfo; | |
1444 | int i, tid; | |
1445 | struct aarch64_debug_reg_state *state; | |
1446 | ||
1447 | if (!linux_nat_get_siginfo (inferior_ptid, &siginfo)) | |
1448 | return 0; | |
1449 | ||
1450 | /* This must be a hardware breakpoint. */ | |
1451 | if (siginfo.si_signo != SIGTRAP | |
1452 | || (siginfo.si_code & 0xffff) != TRAP_HWBKPT) | |
1453 | return 0; | |
1454 | ||
1455 | /* Check if the address matches any watched address. */ | |
d6c44983 | 1456 | state = aarch64_get_debug_reg_state (ptid_get_pid (inferior_ptid)); |
9d19df75 MS |
1457 | for (i = aarch64_num_wp_regs - 1; i >= 0; --i) |
1458 | { | |
1459 | const unsigned int len = aarch64_watchpoint_length (state->dr_ctrl_wp[i]); | |
1460 | const CORE_ADDR addr_trap = (CORE_ADDR) siginfo.si_addr; | |
1461 | const CORE_ADDR addr_watch = state->dr_addr_wp[i]; | |
1462 | ||
1463 | if (state->dr_ref_count_wp[i] | |
1464 | && DR_CONTROL_ENABLED (state->dr_ctrl_wp[i]) | |
1465 | && addr_trap >= addr_watch | |
1466 | && addr_trap < addr_watch + len) | |
1467 | { | |
1468 | *addr_p = addr_trap; | |
1469 | return 1; | |
1470 | } | |
1471 | } | |
1472 | ||
1473 | return 0; | |
1474 | } | |
1475 | ||
1476 | /* Implement the "to_stopped_by_watchpoint" target_ops method. */ | |
1477 | ||
1478 | static int | |
1479 | aarch64_linux_stopped_by_watchpoint (void) | |
1480 | { | |
1481 | CORE_ADDR addr; | |
1482 | ||
1483 | return aarch64_linux_stopped_data_address (¤t_target, &addr); | |
1484 | } | |
1485 | ||
1486 | /* Implement the "to_watchpoint_addr_within_range" target_ops method. */ | |
1487 | ||
1488 | static int | |
1489 | aarch64_linux_watchpoint_addr_within_range (struct target_ops *target, | |
1490 | CORE_ADDR addr, | |
1491 | CORE_ADDR start, int length) | |
1492 | { | |
1493 | return start <= addr && start + length - 1 >= addr; | |
1494 | } | |
1495 | ||
1496 | /* Define AArch64 maintenance commands. */ | |
1497 | ||
1498 | static void | |
1499 | add_show_debug_regs_command (void) | |
1500 | { | |
1501 | /* A maintenance command to enable printing the internal DRi mirror | |
1502 | variables. */ | |
1503 | add_setshow_boolean_cmd ("show-debug-regs", class_maintenance, | |
1504 | &debug_hw_points, _("\ | |
1505 | Set whether to show variables that mirror the AArch64 debug registers."), _("\ | |
1506 | Show whether to show variables that mirror the AArch64 debug registers."), _("\ | |
1507 | Use \"on\" to enable, \"off\" to disable.\n\ | |
1508 | If enabled, the debug registers values are shown when GDB inserts\n\ | |
1509 | or removes a hardware breakpoint or watchpoint, and when the inferior\n\ | |
1510 | triggers a breakpoint or watchpoint."), | |
1511 | NULL, | |
1512 | NULL, | |
1513 | &maintenance_set_cmdlist, | |
1514 | &maintenance_show_cmdlist); | |
1515 | } | |
1516 | ||
1517 | /* -Wmissing-prototypes. */ | |
1518 | void _initialize_aarch64_linux_nat (void); | |
1519 | ||
1520 | void | |
1521 | _initialize_aarch64_linux_nat (void) | |
1522 | { | |
1523 | struct target_ops *t; | |
1524 | ||
1525 | /* Fill in the generic GNU/Linux methods. */ | |
1526 | t = linux_target (); | |
1527 | ||
1528 | add_show_debug_regs_command (); | |
1529 | ||
1530 | /* Add our register access methods. */ | |
1531 | t->to_fetch_registers = aarch64_linux_fetch_inferior_registers; | |
1532 | t->to_store_registers = aarch64_linux_store_inferior_registers; | |
1533 | ||
1534 | t->to_read_description = aarch64_linux_read_description; | |
1535 | ||
1536 | t->to_can_use_hw_breakpoint = aarch64_linux_can_use_hw_breakpoint; | |
1537 | t->to_insert_hw_breakpoint = aarch64_linux_insert_hw_breakpoint; | |
1538 | t->to_remove_hw_breakpoint = aarch64_linux_remove_hw_breakpoint; | |
1539 | t->to_region_ok_for_hw_watchpoint = | |
1540 | aarch64_linux_region_ok_for_hw_watchpoint; | |
1541 | t->to_insert_watchpoint = aarch64_linux_insert_watchpoint; | |
1542 | t->to_remove_watchpoint = aarch64_linux_remove_watchpoint; | |
1543 | t->to_stopped_by_watchpoint = aarch64_linux_stopped_by_watchpoint; | |
1544 | t->to_stopped_data_address = aarch64_linux_stopped_data_address; | |
1545 | t->to_watchpoint_addr_within_range = | |
1546 | aarch64_linux_watchpoint_addr_within_range; | |
9d19df75 MS |
1547 | |
1548 | /* Override the GNU/Linux inferior startup hook. */ | |
1549 | super_post_startup_inferior = t->to_post_startup_inferior; | |
1550 | t->to_post_startup_inferior = aarch64_linux_child_post_startup_inferior; | |
1551 | ||
1552 | /* Register the target. */ | |
1553 | linux_nat_add_target (t); | |
1554 | linux_nat_set_new_thread (t, aarch64_linux_new_thread); | |
d6c44983 YZ |
1555 | linux_nat_set_new_fork (t, aarch64_linux_new_fork); |
1556 | linux_nat_set_forget_process (t, aarch64_forget_process); | |
9d19df75 MS |
1557 | linux_nat_set_prepare_to_resume (t, aarch64_linux_prepare_to_resume); |
1558 | } |