Commit | Line | Data |
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0a30fbc4 | 1 | /* GNU/Linux/MIPS specific low level interface, for the remote server for GDB. |
32d0add0 | 2 | Copyright (C) 1995-2015 Free Software Foundation, Inc. |
0a30fbc4 DJ |
3 | |
4 | This file is part of GDB. | |
5 | ||
6 | This program is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 8 | the Free Software Foundation; either version 3 of the License, or |
0a30fbc4 DJ |
9 | (at your option) any later version. |
10 | ||
11 | This program is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
a9762ec7 | 17 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
0a30fbc4 DJ |
18 | |
19 | #include "server.h" | |
58caa3dc | 20 | #include "linux-low.h" |
0a30fbc4 | 21 | |
5826e159 | 22 | #include "nat/gdb_ptrace.h" |
186947f7 | 23 | #include <endian.h> |
21b0f40c | 24 | |
125f8a3d | 25 | #include "nat/mips-linux-watch.h" |
21b0f40c DJ |
26 | #include "gdb_proc_service.h" |
27 | ||
d05b4ac3 UW |
28 | /* Defined in auto-generated file mips-linux.c. */ |
29 | void init_registers_mips_linux (void); | |
3aee8918 PA |
30 | extern const struct target_desc *tdesc_mips_linux; |
31 | ||
1faeff08 MR |
32 | /* Defined in auto-generated file mips-dsp-linux.c. */ |
33 | void init_registers_mips_dsp_linux (void); | |
3aee8918 PA |
34 | extern const struct target_desc *tdesc_mips_dsp_linux; |
35 | ||
d05b4ac3 UW |
36 | /* Defined in auto-generated file mips64-linux.c. */ |
37 | void init_registers_mips64_linux (void); | |
3aee8918 PA |
38 | extern const struct target_desc *tdesc_mips64_linux; |
39 | ||
1faeff08 MR |
40 | /* Defined in auto-generated file mips64-dsp-linux.c. */ |
41 | void init_registers_mips64_dsp_linux (void); | |
3aee8918 | 42 | extern const struct target_desc *tdesc_mips64_dsp_linux; |
1faeff08 MR |
43 | |
44 | #ifdef __mips64 | |
3aee8918 PA |
45 | #define tdesc_mips_linux tdesc_mips64_linux |
46 | #define tdesc_mips_dsp_linux tdesc_mips64_dsp_linux | |
1faeff08 | 47 | #endif |
d05b4ac3 | 48 | |
21b0f40c DJ |
49 | #ifndef PTRACE_GET_THREAD_AREA |
50 | #define PTRACE_GET_THREAD_AREA 25 | |
51 | #endif | |
52 | ||
0a30fbc4 DJ |
53 | #ifdef HAVE_SYS_REG_H |
54 | #include <sys/reg.h> | |
55 | #endif | |
56 | ||
117ce543 | 57 | #define mips_num_regs 73 |
1faeff08 | 58 | #define mips_dsp_num_regs 80 |
0a30fbc4 DJ |
59 | |
60 | #include <asm/ptrace.h> | |
61 | ||
1faeff08 MR |
62 | #ifndef DSP_BASE |
63 | #define DSP_BASE 71 | |
64 | #define DSP_CONTROL 77 | |
65 | #endif | |
66 | ||
186947f7 DJ |
67 | union mips_register |
68 | { | |
69 | unsigned char buf[8]; | |
70 | ||
71 | /* Deliberately signed, for proper sign extension. */ | |
72 | int reg32; | |
73 | long long reg64; | |
74 | }; | |
75 | ||
0a30fbc4 DJ |
76 | /* Return the ptrace ``address'' of register REGNO. */ |
77 | ||
1faeff08 MR |
78 | #define mips_base_regs \ |
79 | -1, 1, 2, 3, 4, 5, 6, 7, \ | |
80 | 8, 9, 10, 11, 12, 13, 14, 15, \ | |
81 | 16, 17, 18, 19, 20, 21, 22, 23, \ | |
82 | 24, 25, 26, 27, 28, 29, 30, 31, \ | |
83 | \ | |
84 | -1, MMLO, MMHI, BADVADDR, CAUSE, PC, \ | |
85 | \ | |
86 | FPR_BASE, FPR_BASE + 1, FPR_BASE + 2, FPR_BASE + 3, \ | |
87 | FPR_BASE + 4, FPR_BASE + 5, FPR_BASE + 6, FPR_BASE + 7, \ | |
88 | FPR_BASE + 8, FPR_BASE + 9, FPR_BASE + 10, FPR_BASE + 11, \ | |
89 | FPR_BASE + 12, FPR_BASE + 13, FPR_BASE + 14, FPR_BASE + 15, \ | |
90 | FPR_BASE + 16, FPR_BASE + 17, FPR_BASE + 18, FPR_BASE + 19, \ | |
91 | FPR_BASE + 20, FPR_BASE + 21, FPR_BASE + 22, FPR_BASE + 23, \ | |
92 | FPR_BASE + 24, FPR_BASE + 25, FPR_BASE + 26, FPR_BASE + 27, \ | |
93 | FPR_BASE + 28, FPR_BASE + 29, FPR_BASE + 30, FPR_BASE + 31, \ | |
94 | FPC_CSR, FPC_EIR | |
95 | ||
96 | #define mips_dsp_regs \ | |
97 | DSP_BASE, DSP_BASE + 1, DSP_BASE + 2, DSP_BASE + 3, \ | |
98 | DSP_BASE + 4, DSP_BASE + 5, \ | |
99 | DSP_CONTROL | |
100 | ||
101 | static int mips_regmap[mips_num_regs] = { | |
102 | mips_base_regs, | |
103 | 0 | |
104 | }; | |
0a30fbc4 | 105 | |
1faeff08 MR |
106 | static int mips_dsp_regmap[mips_dsp_num_regs] = { |
107 | mips_base_regs, | |
108 | mips_dsp_regs, | |
109 | 0 | |
110 | }; | |
0a30fbc4 | 111 | |
1faeff08 MR |
112 | /* DSP registers are not in any regset and can only be accessed |
113 | individually. */ | |
0a30fbc4 | 114 | |
1faeff08 MR |
115 | static unsigned char mips_dsp_regset_bitmap[(mips_dsp_num_regs + 7) / 8] = { |
116 | 0xfe, 0xff, 0xff, 0xff, 0xfe, 0xff, 0xff, 0xff, 0xff, 0x80 | |
0a30fbc4 DJ |
117 | }; |
118 | ||
3aee8918 PA |
119 | static int have_dsp = -1; |
120 | ||
1faeff08 MR |
121 | /* Try peeking at an arbitrarily chosen DSP register and pick the available |
122 | user register set accordingly. */ | |
123 | ||
3aee8918 PA |
124 | static const struct target_desc * |
125 | mips_read_description (void) | |
1faeff08 | 126 | { |
3aee8918 | 127 | if (have_dsp < 0) |
1faeff08 | 128 | { |
0bfdf32f | 129 | int pid = lwpid_of (current_thread); |
1faeff08 | 130 | |
ac740bc7 | 131 | errno = 0; |
1faeff08 MR |
132 | ptrace (PTRACE_PEEKUSER, pid, DSP_CONTROL, 0); |
133 | switch (errno) | |
134 | { | |
135 | case 0: | |
3aee8918 | 136 | have_dsp = 1; |
1faeff08 MR |
137 | break; |
138 | case EIO: | |
3aee8918 | 139 | have_dsp = 0; |
1faeff08 MR |
140 | break; |
141 | default: | |
142 | perror_with_name ("ptrace"); | |
143 | break; | |
144 | } | |
145 | } | |
3aee8918 PA |
146 | |
147 | return have_dsp ? tdesc_mips_dsp_linux : tdesc_mips_linux; | |
148 | } | |
149 | ||
150 | static void | |
151 | mips_arch_setup (void) | |
152 | { | |
153 | current_process ()->tdesc = mips_read_description (); | |
154 | } | |
155 | ||
156 | static struct usrregs_info * | |
157 | get_usrregs_info (void) | |
158 | { | |
159 | const struct regs_info *regs_info = the_low_target.regs_info (); | |
160 | ||
161 | return regs_info->usrregs; | |
1faeff08 MR |
162 | } |
163 | ||
7a60ad40 YQ |
164 | /* Per-process arch-specific data we want to keep. */ |
165 | ||
166 | struct arch_process_info | |
167 | { | |
168 | /* -1 if the kernel and/or CPU do not support watch registers. | |
169 | 1 if watch_readback is valid and we can read style, num_valid | |
170 | and the masks. | |
171 | 0 if we need to read the watch_readback. */ | |
172 | ||
173 | int watch_readback_valid; | |
174 | ||
175 | /* Cached watch register read values. */ | |
176 | ||
177 | struct pt_watch_regs watch_readback; | |
178 | ||
179 | /* Current watchpoint requests for this process. */ | |
180 | ||
181 | struct mips_watchpoint *current_watches; | |
182 | ||
183 | /* The current set of watch register values for writing the | |
184 | registers. */ | |
185 | ||
186 | struct pt_watch_regs watch_mirror; | |
187 | }; | |
188 | ||
189 | /* Per-thread arch-specific data we want to keep. */ | |
190 | ||
191 | struct arch_lwp_info | |
192 | { | |
193 | /* Non-zero if our copy differs from what's recorded in the thread. */ | |
194 | int watch_registers_changed; | |
195 | }; | |
196 | ||
0a30fbc4 DJ |
197 | /* From mips-linux-nat.c. */ |
198 | ||
199 | /* Pseudo registers can not be read. ptrace does not provide a way to | |
200 | read (or set) PS_REGNUM, and there's no point in reading or setting | |
201 | ZERO_REGNUM. We also can not set BADVADDR, CAUSE, or FCRIR via | |
202 | ptrace(). */ | |
203 | ||
2ec06d2e DJ |
204 | static int |
205 | mips_cannot_fetch_register (int regno) | |
0a30fbc4 | 206 | { |
3aee8918 PA |
207 | const struct target_desc *tdesc; |
208 | ||
209 | if (get_usrregs_info ()->regmap[regno] == -1) | |
0a30fbc4 DJ |
210 | return 1; |
211 | ||
3aee8918 PA |
212 | tdesc = current_process ()->tdesc; |
213 | ||
214 | if (find_regno (tdesc, "r0") == regno) | |
0a30fbc4 DJ |
215 | return 1; |
216 | ||
217 | return 0; | |
218 | } | |
219 | ||
2ec06d2e DJ |
220 | static int |
221 | mips_cannot_store_register (int regno) | |
0a30fbc4 | 222 | { |
3aee8918 PA |
223 | const struct target_desc *tdesc; |
224 | ||
225 | if (get_usrregs_info ()->regmap[regno] == -1) | |
0a30fbc4 DJ |
226 | return 1; |
227 | ||
3aee8918 PA |
228 | tdesc = current_process ()->tdesc; |
229 | ||
230 | if (find_regno (tdesc, "r0") == regno) | |
0a30fbc4 DJ |
231 | return 1; |
232 | ||
3aee8918 | 233 | if (find_regno (tdesc, "cause") == regno) |
0a30fbc4 DJ |
234 | return 1; |
235 | ||
3aee8918 | 236 | if (find_regno (tdesc, "badvaddr") == regno) |
0a30fbc4 DJ |
237 | return 1; |
238 | ||
3aee8918 | 239 | if (find_regno (tdesc, "fir") == regno) |
0a30fbc4 DJ |
240 | return 1; |
241 | ||
242 | return 0; | |
243 | } | |
2ec06d2e | 244 | |
0d62e5e8 | 245 | static CORE_ADDR |
442ea881 | 246 | mips_get_pc (struct regcache *regcache) |
0d62e5e8 | 247 | { |
186947f7 | 248 | union mips_register pc; |
442ea881 | 249 | collect_register_by_name (regcache, "pc", pc.buf); |
3aee8918 | 250 | return register_size (regcache->tdesc, 0) == 4 ? pc.reg32 : pc.reg64; |
0d62e5e8 DJ |
251 | } |
252 | ||
253 | static void | |
442ea881 | 254 | mips_set_pc (struct regcache *regcache, CORE_ADDR pc) |
0d62e5e8 | 255 | { |
186947f7 | 256 | union mips_register newpc; |
3aee8918 | 257 | if (register_size (regcache->tdesc, 0) == 4) |
186947f7 DJ |
258 | newpc.reg32 = pc; |
259 | else | |
260 | newpc.reg64 = pc; | |
261 | ||
442ea881 | 262 | supply_register_by_name (regcache, "pc", newpc.buf); |
0d62e5e8 DJ |
263 | } |
264 | ||
265 | /* Correct in either endianness. */ | |
186947f7 | 266 | static const unsigned int mips_breakpoint = 0x0005000d; |
0d62e5e8 DJ |
267 | #define mips_breakpoint_len 4 |
268 | ||
dd373349 AT |
269 | /* Implementation of linux_target_ops method "sw_breakpoint_from_kind". */ |
270 | ||
271 | static const gdb_byte * | |
272 | mips_sw_breakpoint_from_kind (int kind, int *size) | |
273 | { | |
274 | *size = mips_breakpoint_len; | |
275 | return (const gdb_byte *) &mips_breakpoint; | |
276 | } | |
277 | ||
0d62e5e8 DJ |
278 | /* We only place breakpoints in empty marker functions, and thread locking |
279 | is outside of the function. So rather than importing software single-step, | |
280 | we can just run until exit. */ | |
281 | static CORE_ADDR | |
442ea881 | 282 | mips_reinsert_addr (void) |
0d62e5e8 | 283 | { |
0bfdf32f | 284 | struct regcache *regcache = get_thread_regcache (current_thread, 1); |
186947f7 | 285 | union mips_register ra; |
442ea881 | 286 | collect_register_by_name (regcache, "r31", ra.buf); |
3aee8918 | 287 | return register_size (regcache->tdesc, 0) == 4 ? ra.reg32 : ra.reg64; |
0d62e5e8 DJ |
288 | } |
289 | ||
290 | static int | |
291 | mips_breakpoint_at (CORE_ADDR where) | |
292 | { | |
186947f7 | 293 | unsigned int insn; |
0d62e5e8 | 294 | |
f450004a | 295 | (*the_target->read_memory) (where, (unsigned char *) &insn, 4); |
0d62e5e8 DJ |
296 | if (insn == mips_breakpoint) |
297 | return 1; | |
298 | ||
299 | /* If necessary, recognize more trap instructions here. GDB only uses the | |
300 | one. */ | |
301 | return 0; | |
302 | } | |
303 | ||
7a60ad40 YQ |
304 | /* Mark the watch registers of lwp, represented by ENTRY, as changed, |
305 | if the lwp's process id is *PID_P. */ | |
306 | ||
307 | static int | |
308 | update_watch_registers_callback (struct inferior_list_entry *entry, | |
309 | void *pid_p) | |
310 | { | |
d86d4aaf DE |
311 | struct thread_info *thread = (struct thread_info *) entry; |
312 | struct lwp_info *lwp = get_thread_lwp (thread); | |
7a60ad40 YQ |
313 | int pid = *(int *) pid_p; |
314 | ||
315 | /* Only update the threads of this process. */ | |
d86d4aaf | 316 | if (pid_of (thread) == pid) |
7a60ad40 YQ |
317 | { |
318 | /* The actual update is done later just before resuming the lwp, | |
319 | we just mark that the registers need updating. */ | |
320 | lwp->arch_private->watch_registers_changed = 1; | |
321 | ||
322 | /* If the lwp isn't stopped, force it to momentarily pause, so | |
323 | we can update its watch registers. */ | |
324 | if (!lwp->stopped) | |
325 | linux_stop_lwp (lwp); | |
326 | } | |
327 | ||
328 | return 0; | |
329 | } | |
330 | ||
331 | /* This is the implementation of linux_target_ops method | |
332 | new_process. */ | |
333 | ||
334 | static struct arch_process_info * | |
335 | mips_linux_new_process (void) | |
336 | { | |
8d749320 | 337 | struct arch_process_info *info = XCNEW (struct arch_process_info); |
7a60ad40 YQ |
338 | |
339 | return info; | |
340 | } | |
341 | ||
342 | /* This is the implementation of linux_target_ops method new_thread. | |
343 | Mark the watch registers as changed, so the threads' copies will | |
344 | be updated. */ | |
345 | ||
34c703da GB |
346 | static void |
347 | mips_linux_new_thread (struct lwp_info *lwp) | |
7a60ad40 | 348 | { |
8d749320 | 349 | struct arch_lwp_info *info = XCNEW (struct arch_lwp_info); |
7a60ad40 YQ |
350 | |
351 | info->watch_registers_changed = 1; | |
352 | ||
34c703da | 353 | lwp->arch_private = info; |
7a60ad40 YQ |
354 | } |
355 | ||
3a8a0396 DB |
356 | /* Create a new mips_watchpoint and add it to the list. */ |
357 | ||
358 | static void | |
cbec665b | 359 | mips_add_watchpoint (struct arch_process_info *priv, CORE_ADDR addr, int len, |
eb3e3c67 | 360 | enum target_hw_bp_type watch_type) |
3a8a0396 DB |
361 | { |
362 | struct mips_watchpoint *new_watch; | |
363 | struct mips_watchpoint **pw; | |
364 | ||
8d749320 | 365 | new_watch = XNEW (struct mips_watchpoint); |
3a8a0396 DB |
366 | new_watch->addr = addr; |
367 | new_watch->len = len; | |
368 | new_watch->type = watch_type; | |
369 | new_watch->next = NULL; | |
370 | ||
cbec665b | 371 | pw = &priv->current_watches; |
3a8a0396 DB |
372 | while (*pw != NULL) |
373 | pw = &(*pw)->next; | |
374 | *pw = new_watch; | |
375 | } | |
376 | ||
377 | /* Hook to call when a new fork is attached. */ | |
378 | ||
379 | static void | |
380 | mips_linux_new_fork (struct process_info *parent, | |
381 | struct process_info *child) | |
382 | { | |
383 | struct arch_process_info *parent_private; | |
384 | struct arch_process_info *child_private; | |
385 | struct mips_watchpoint *wp; | |
386 | ||
387 | /* These are allocated by linux_add_process. */ | |
61a7418c DB |
388 | gdb_assert (parent->priv != NULL |
389 | && parent->priv->arch_private != NULL); | |
390 | gdb_assert (child->priv != NULL | |
391 | && child->priv->arch_private != NULL); | |
3a8a0396 DB |
392 | |
393 | /* Linux kernel before 2.6.33 commit | |
394 | 72f674d203cd230426437cdcf7dd6f681dad8b0d | |
395 | will inherit hardware debug registers from parent | |
396 | on fork/vfork/clone. Newer Linux kernels create such tasks with | |
397 | zeroed debug registers. | |
398 | ||
399 | GDB core assumes the child inherits the watchpoints/hw | |
400 | breakpoints of the parent, and will remove them all from the | |
401 | forked off process. Copy the debug registers mirrors into the | |
402 | new process so that all breakpoints and watchpoints can be | |
403 | removed together. The debug registers mirror will become zeroed | |
404 | in the end before detaching the forked off process, thus making | |
405 | this compatible with older Linux kernels too. */ | |
406 | ||
61a7418c DB |
407 | parent_private = parent->priv->arch_private; |
408 | child_private = child->priv->arch_private; | |
3a8a0396 DB |
409 | |
410 | child_private->watch_readback_valid = parent_private->watch_readback_valid; | |
411 | child_private->watch_readback = parent_private->watch_readback; | |
412 | ||
413 | for (wp = parent_private->current_watches; wp != NULL; wp = wp->next) | |
414 | mips_add_watchpoint (child_private, wp->addr, wp->len, wp->type); | |
415 | ||
416 | child_private->watch_mirror = parent_private->watch_mirror; | |
417 | } | |
7a60ad40 YQ |
418 | /* This is the implementation of linux_target_ops method |
419 | prepare_to_resume. If the watch regs have changed, update the | |
420 | thread's copies. */ | |
421 | ||
422 | static void | |
423 | mips_linux_prepare_to_resume (struct lwp_info *lwp) | |
424 | { | |
d86d4aaf | 425 | ptid_t ptid = ptid_of (get_lwp_thread (lwp)); |
7a60ad40 | 426 | struct process_info *proc = find_process_pid (ptid_get_pid (ptid)); |
fe978cb0 | 427 | struct arch_process_info *priv = proc->priv->arch_private; |
7a60ad40 YQ |
428 | |
429 | if (lwp->arch_private->watch_registers_changed) | |
430 | { | |
431 | /* Only update the watch registers if we have set or unset a | |
432 | watchpoint already. */ | |
fe978cb0 | 433 | if (mips_linux_watch_get_num_valid (&priv->watch_mirror) > 0) |
7a60ad40 YQ |
434 | { |
435 | /* Write the mirrored watch register values. */ | |
436 | int tid = ptid_get_lwp (ptid); | |
437 | ||
438 | if (-1 == ptrace (PTRACE_SET_WATCH_REGS, tid, | |
aa58a496 | 439 | &priv->watch_mirror, NULL)) |
7a60ad40 YQ |
440 | perror_with_name ("Couldn't write watch register"); |
441 | } | |
442 | ||
443 | lwp->arch_private->watch_registers_changed = 0; | |
444 | } | |
445 | } | |
446 | ||
802e8e6d PA |
447 | static int |
448 | mips_supports_z_point_type (char z_type) | |
449 | { | |
450 | switch (z_type) | |
451 | { | |
452 | case Z_PACKET_WRITE_WP: | |
453 | case Z_PACKET_READ_WP: | |
454 | case Z_PACKET_ACCESS_WP: | |
455 | return 1; | |
456 | default: | |
457 | return 0; | |
458 | } | |
459 | } | |
460 | ||
7a60ad40 YQ |
461 | /* This is the implementation of linux_target_ops method |
462 | insert_point. */ | |
463 | ||
464 | static int | |
802e8e6d PA |
465 | mips_insert_point (enum raw_bkpt_type type, CORE_ADDR addr, |
466 | int len, struct raw_breakpoint *bp) | |
7a60ad40 YQ |
467 | { |
468 | struct process_info *proc = current_process (); | |
fe978cb0 | 469 | struct arch_process_info *priv = proc->priv->arch_private; |
7a60ad40 | 470 | struct pt_watch_regs regs; |
7a60ad40 YQ |
471 | int pid; |
472 | long lwpid; | |
473 | enum target_hw_bp_type watch_type; | |
474 | uint32_t irw; | |
475 | ||
0bfdf32f | 476 | lwpid = lwpid_of (current_thread); |
7a60ad40 | 477 | if (!mips_linux_read_watch_registers (lwpid, |
fe978cb0 PA |
478 | &priv->watch_readback, |
479 | &priv->watch_readback_valid, | |
7a60ad40 YQ |
480 | 0)) |
481 | return -1; | |
482 | ||
483 | if (len <= 0) | |
484 | return -1; | |
485 | ||
fe978cb0 | 486 | regs = priv->watch_readback; |
7a60ad40 | 487 | /* Add the current watches. */ |
fe978cb0 | 488 | mips_linux_watch_populate_regs (priv->current_watches, ®s); |
7a60ad40 YQ |
489 | |
490 | /* Now try to add the new watch. */ | |
802e8e6d | 491 | watch_type = raw_bkpt_type_to_target_hw_bp_type (type); |
7a60ad40 YQ |
492 | irw = mips_linux_watch_type_to_irw (watch_type); |
493 | if (!mips_linux_watch_try_one_watch (®s, addr, len, irw)) | |
494 | return -1; | |
495 | ||
496 | /* It fit. Stick it on the end of the list. */ | |
3a8a0396 | 497 | mips_add_watchpoint (priv, addr, len, watch_type); |
7a60ad40 | 498 | |
fe978cb0 | 499 | priv->watch_mirror = regs; |
7a60ad40 YQ |
500 | |
501 | /* Only update the threads of this process. */ | |
502 | pid = pid_of (proc); | |
d86d4aaf | 503 | find_inferior (&all_threads, update_watch_registers_callback, &pid); |
7a60ad40 YQ |
504 | |
505 | return 0; | |
506 | } | |
507 | ||
508 | /* This is the implementation of linux_target_ops method | |
509 | remove_point. */ | |
510 | ||
511 | static int | |
802e8e6d PA |
512 | mips_remove_point (enum raw_bkpt_type type, CORE_ADDR addr, |
513 | int len, struct raw_breakpoint *bp) | |
7a60ad40 YQ |
514 | { |
515 | struct process_info *proc = current_process (); | |
fe978cb0 | 516 | struct arch_process_info *priv = proc->priv->arch_private; |
7a60ad40 YQ |
517 | |
518 | int deleted_one; | |
519 | int pid; | |
520 | enum target_hw_bp_type watch_type; | |
521 | ||
522 | struct mips_watchpoint **pw; | |
523 | struct mips_watchpoint *w; | |
524 | ||
7a60ad40 | 525 | /* Search for a known watch that matches. Then unlink and free it. */ |
802e8e6d | 526 | watch_type = raw_bkpt_type_to_target_hw_bp_type (type); |
7a60ad40 | 527 | deleted_one = 0; |
fe978cb0 | 528 | pw = &priv->current_watches; |
7a60ad40 YQ |
529 | while ((w = *pw)) |
530 | { | |
531 | if (w->addr == addr && w->len == len && w->type == watch_type) | |
532 | { | |
533 | *pw = w->next; | |
534 | free (w); | |
535 | deleted_one = 1; | |
536 | break; | |
537 | } | |
538 | pw = &(w->next); | |
539 | } | |
540 | ||
541 | if (!deleted_one) | |
542 | return -1; /* We don't know about it, fail doing nothing. */ | |
543 | ||
544 | /* At this point watch_readback is known to be valid because we | |
545 | could not have added the watch without reading it. */ | |
fe978cb0 | 546 | gdb_assert (priv->watch_readback_valid == 1); |
7a60ad40 | 547 | |
fe978cb0 PA |
548 | priv->watch_mirror = priv->watch_readback; |
549 | mips_linux_watch_populate_regs (priv->current_watches, | |
550 | &priv->watch_mirror); | |
7a60ad40 YQ |
551 | |
552 | /* Only update the threads of this process. */ | |
553 | pid = pid_of (proc); | |
d86d4aaf | 554 | find_inferior (&all_threads, update_watch_registers_callback, &pid); |
7a60ad40 YQ |
555 | return 0; |
556 | } | |
557 | ||
558 | /* This is the implementation of linux_target_ops method | |
559 | stopped_by_watchpoint. The watchhi R and W bits indicate | |
560 | the watch register triggered. */ | |
561 | ||
562 | static int | |
563 | mips_stopped_by_watchpoint (void) | |
564 | { | |
565 | struct process_info *proc = current_process (); | |
fe978cb0 | 566 | struct arch_process_info *priv = proc->priv->arch_private; |
7a60ad40 YQ |
567 | int n; |
568 | int num_valid; | |
0bfdf32f | 569 | long lwpid = lwpid_of (current_thread); |
7a60ad40 YQ |
570 | |
571 | if (!mips_linux_read_watch_registers (lwpid, | |
fe978cb0 PA |
572 | &priv->watch_readback, |
573 | &priv->watch_readback_valid, | |
7a60ad40 YQ |
574 | 1)) |
575 | return 0; | |
576 | ||
fe978cb0 | 577 | num_valid = mips_linux_watch_get_num_valid (&priv->watch_readback); |
7a60ad40 YQ |
578 | |
579 | for (n = 0; n < MAX_DEBUG_REGISTER && n < num_valid; n++) | |
fe978cb0 | 580 | if (mips_linux_watch_get_watchhi (&priv->watch_readback, n) |
7a60ad40 YQ |
581 | & (R_MASK | W_MASK)) |
582 | return 1; | |
583 | ||
584 | return 0; | |
585 | } | |
586 | ||
587 | /* This is the implementation of linux_target_ops method | |
588 | stopped_data_address. */ | |
589 | ||
590 | static CORE_ADDR | |
591 | mips_stopped_data_address (void) | |
592 | { | |
593 | struct process_info *proc = current_process (); | |
fe978cb0 | 594 | struct arch_process_info *priv = proc->priv->arch_private; |
7a60ad40 YQ |
595 | int n; |
596 | int num_valid; | |
0bfdf32f | 597 | long lwpid = lwpid_of (current_thread); |
7a60ad40 YQ |
598 | |
599 | /* On MIPS we don't know the low order 3 bits of the data address. | |
600 | GDB does not support remote targets that can't report the | |
601 | watchpoint address. So, make our best guess; return the starting | |
602 | address of a watchpoint request which overlaps the one that | |
603 | triggered. */ | |
604 | ||
605 | if (!mips_linux_read_watch_registers (lwpid, | |
fe978cb0 PA |
606 | &priv->watch_readback, |
607 | &priv->watch_readback_valid, | |
7a60ad40 YQ |
608 | 0)) |
609 | return 0; | |
610 | ||
fe978cb0 | 611 | num_valid = mips_linux_watch_get_num_valid (&priv->watch_readback); |
7a60ad40 YQ |
612 | |
613 | for (n = 0; n < MAX_DEBUG_REGISTER && n < num_valid; n++) | |
fe978cb0 | 614 | if (mips_linux_watch_get_watchhi (&priv->watch_readback, n) |
7a60ad40 YQ |
615 | & (R_MASK | W_MASK)) |
616 | { | |
617 | CORE_ADDR t_low, t_hi; | |
618 | int t_irw; | |
619 | struct mips_watchpoint *watch; | |
620 | ||
fe978cb0 | 621 | t_low = mips_linux_watch_get_watchlo (&priv->watch_readback, n); |
7a60ad40 | 622 | t_irw = t_low & IRW_MASK; |
fe978cb0 | 623 | t_hi = (mips_linux_watch_get_watchhi (&priv->watch_readback, n) |
7a60ad40 YQ |
624 | | IRW_MASK); |
625 | t_low &= ~(CORE_ADDR)t_hi; | |
626 | ||
fe978cb0 | 627 | for (watch = priv->current_watches; |
7a60ad40 YQ |
628 | watch != NULL; |
629 | watch = watch->next) | |
630 | { | |
631 | CORE_ADDR addr = watch->addr; | |
632 | CORE_ADDR last_byte = addr + watch->len - 1; | |
633 | ||
634 | if ((t_irw & mips_linux_watch_type_to_irw (watch->type)) == 0) | |
635 | { | |
636 | /* Different type. */ | |
637 | continue; | |
638 | } | |
639 | /* Check for overlap of even a single byte. */ | |
640 | if (last_byte >= t_low && addr <= t_low + t_hi) | |
641 | return addr; | |
642 | } | |
643 | } | |
644 | ||
645 | /* Shouldn't happen. */ | |
646 | return 0; | |
647 | } | |
648 | ||
21b0f40c DJ |
649 | /* Fetch the thread-local storage pointer for libthread_db. */ |
650 | ||
651 | ps_err_e | |
652 | ps_get_thread_area (const struct ps_prochandle *ph, | |
1b3f6016 | 653 | lwpid_t lwpid, int idx, void **base) |
21b0f40c DJ |
654 | { |
655 | if (ptrace (PTRACE_GET_THREAD_AREA, lwpid, NULL, base) != 0) | |
656 | return PS_ERR; | |
657 | ||
658 | /* IDX is the bias from the thread pointer to the beginning of the | |
659 | thread descriptor. It has to be subtracted due to implementation | |
660 | quirks in libthread_db. */ | |
661 | *base = (void *) ((char *)*base - idx); | |
662 | ||
663 | return PS_OK; | |
664 | } | |
665 | ||
186947f7 DJ |
666 | #ifdef HAVE_PTRACE_GETREGS |
667 | ||
668 | static void | |
442ea881 PA |
669 | mips_collect_register (struct regcache *regcache, |
670 | int use_64bit, int regno, union mips_register *reg) | |
186947f7 DJ |
671 | { |
672 | union mips_register tmp_reg; | |
673 | ||
674 | if (use_64bit) | |
675 | { | |
442ea881 | 676 | collect_register (regcache, regno, &tmp_reg.reg64); |
186947f7 DJ |
677 | *reg = tmp_reg; |
678 | } | |
679 | else | |
680 | { | |
442ea881 | 681 | collect_register (regcache, regno, &tmp_reg.reg32); |
186947f7 DJ |
682 | reg->reg64 = tmp_reg.reg32; |
683 | } | |
684 | } | |
685 | ||
686 | static void | |
442ea881 PA |
687 | mips_supply_register (struct regcache *regcache, |
688 | int use_64bit, int regno, const union mips_register *reg) | |
186947f7 DJ |
689 | { |
690 | int offset = 0; | |
691 | ||
692 | /* For big-endian 32-bit targets, ignore the high four bytes of each | |
693 | eight-byte slot. */ | |
694 | if (__BYTE_ORDER == __BIG_ENDIAN && !use_64bit) | |
695 | offset = 4; | |
696 | ||
442ea881 | 697 | supply_register (regcache, regno, reg->buf + offset); |
186947f7 DJ |
698 | } |
699 | ||
700 | static void | |
442ea881 PA |
701 | mips_collect_register_32bit (struct regcache *regcache, |
702 | int use_64bit, int regno, unsigned char *buf) | |
186947f7 DJ |
703 | { |
704 | union mips_register tmp_reg; | |
705 | int reg32; | |
706 | ||
442ea881 | 707 | mips_collect_register (regcache, use_64bit, regno, &tmp_reg); |
186947f7 DJ |
708 | reg32 = tmp_reg.reg64; |
709 | memcpy (buf, ®32, 4); | |
710 | } | |
711 | ||
712 | static void | |
442ea881 PA |
713 | mips_supply_register_32bit (struct regcache *regcache, |
714 | int use_64bit, int regno, const unsigned char *buf) | |
186947f7 DJ |
715 | { |
716 | union mips_register tmp_reg; | |
717 | int reg32; | |
718 | ||
719 | memcpy (®32, buf, 4); | |
720 | tmp_reg.reg64 = reg32; | |
442ea881 | 721 | mips_supply_register (regcache, use_64bit, regno, &tmp_reg); |
186947f7 DJ |
722 | } |
723 | ||
724 | static void | |
442ea881 | 725 | mips_fill_gregset (struct regcache *regcache, void *buf) |
186947f7 | 726 | { |
1996e237 | 727 | union mips_register *regset = (union mips_register *) buf; |
186947f7 | 728 | int i, use_64bit; |
3aee8918 | 729 | const struct target_desc *tdesc = regcache->tdesc; |
186947f7 | 730 | |
3aee8918 | 731 | use_64bit = (register_size (tdesc, 0) == 8); |
186947f7 | 732 | |
117ce543 | 733 | for (i = 1; i < 32; i++) |
442ea881 PA |
734 | mips_collect_register (regcache, use_64bit, i, regset + i); |
735 | ||
736 | mips_collect_register (regcache, use_64bit, | |
3aee8918 | 737 | find_regno (tdesc, "lo"), regset + 32); |
442ea881 | 738 | mips_collect_register (regcache, use_64bit, |
3aee8918 | 739 | find_regno (tdesc, "hi"), regset + 33); |
442ea881 | 740 | mips_collect_register (regcache, use_64bit, |
3aee8918 | 741 | find_regno (tdesc, "pc"), regset + 34); |
442ea881 | 742 | mips_collect_register (regcache, use_64bit, |
3aee8918 | 743 | find_regno (tdesc, "badvaddr"), regset + 35); |
442ea881 | 744 | mips_collect_register (regcache, use_64bit, |
3aee8918 | 745 | find_regno (tdesc, "status"), regset + 36); |
442ea881 | 746 | mips_collect_register (regcache, use_64bit, |
3aee8918 | 747 | find_regno (tdesc, "cause"), regset + 37); |
442ea881 PA |
748 | |
749 | mips_collect_register (regcache, use_64bit, | |
3aee8918 | 750 | find_regno (tdesc, "restart"), regset + 0); |
186947f7 DJ |
751 | } |
752 | ||
753 | static void | |
442ea881 | 754 | mips_store_gregset (struct regcache *regcache, const void *buf) |
186947f7 | 755 | { |
1996e237 | 756 | const union mips_register *regset = (const union mips_register *) buf; |
186947f7 DJ |
757 | int i, use_64bit; |
758 | ||
3aee8918 | 759 | use_64bit = (register_size (regcache->tdesc, 0) == 8); |
186947f7 DJ |
760 | |
761 | for (i = 0; i < 32; i++) | |
442ea881 PA |
762 | mips_supply_register (regcache, use_64bit, i, regset + i); |
763 | ||
442ea881 | 764 | mips_supply_register (regcache, use_64bit, |
3aee8918 PA |
765 | find_regno (regcache->tdesc, "lo"), regset + 32); |
766 | mips_supply_register (regcache, use_64bit, | |
767 | find_regno (regcache->tdesc, "hi"), regset + 33); | |
442ea881 | 768 | mips_supply_register (regcache, use_64bit, |
3aee8918 | 769 | find_regno (regcache->tdesc, "pc"), regset + 34); |
442ea881 | 770 | mips_supply_register (regcache, use_64bit, |
3aee8918 PA |
771 | find_regno (regcache->tdesc, "badvaddr"), regset + 35); |
772 | mips_supply_register (regcache, use_64bit, | |
773 | find_regno (regcache->tdesc, "status"), regset + 36); | |
774 | mips_supply_register (regcache, use_64bit, | |
775 | find_regno (regcache->tdesc, "cause"), regset + 37); | |
442ea881 PA |
776 | |
777 | mips_supply_register (regcache, use_64bit, | |
3aee8918 | 778 | find_regno (regcache->tdesc, "restart"), regset + 0); |
186947f7 DJ |
779 | } |
780 | ||
781 | static void | |
442ea881 | 782 | mips_fill_fpregset (struct regcache *regcache, void *buf) |
186947f7 | 783 | { |
1996e237 | 784 | union mips_register *regset = (union mips_register *) buf; |
186947f7 DJ |
785 | int i, use_64bit, first_fp, big_endian; |
786 | ||
3aee8918 PA |
787 | use_64bit = (register_size (regcache->tdesc, 0) == 8); |
788 | first_fp = find_regno (regcache->tdesc, "f0"); | |
186947f7 DJ |
789 | big_endian = (__BYTE_ORDER == __BIG_ENDIAN); |
790 | ||
791 | /* See GDB for a discussion of this peculiar layout. */ | |
792 | for (i = 0; i < 32; i++) | |
793 | if (use_64bit) | |
442ea881 | 794 | collect_register (regcache, first_fp + i, regset[i].buf); |
186947f7 | 795 | else |
442ea881 | 796 | collect_register (regcache, first_fp + i, |
186947f7 DJ |
797 | regset[i & ~1].buf + 4 * (big_endian != (i & 1))); |
798 | ||
442ea881 | 799 | mips_collect_register_32bit (regcache, use_64bit, |
3aee8918 PA |
800 | find_regno (regcache->tdesc, "fcsr"), regset[32].buf); |
801 | mips_collect_register_32bit (regcache, use_64bit, | |
802 | find_regno (regcache->tdesc, "fir"), | |
186947f7 DJ |
803 | regset[32].buf + 4); |
804 | } | |
805 | ||
806 | static void | |
442ea881 | 807 | mips_store_fpregset (struct regcache *regcache, const void *buf) |
186947f7 | 808 | { |
1996e237 | 809 | const union mips_register *regset = (const union mips_register *) buf; |
186947f7 DJ |
810 | int i, use_64bit, first_fp, big_endian; |
811 | ||
3aee8918 PA |
812 | use_64bit = (register_size (regcache->tdesc, 0) == 8); |
813 | first_fp = find_regno (regcache->tdesc, "f0"); | |
186947f7 DJ |
814 | big_endian = (__BYTE_ORDER == __BIG_ENDIAN); |
815 | ||
816 | /* See GDB for a discussion of this peculiar layout. */ | |
817 | for (i = 0; i < 32; i++) | |
818 | if (use_64bit) | |
442ea881 | 819 | supply_register (regcache, first_fp + i, regset[i].buf); |
186947f7 | 820 | else |
442ea881 | 821 | supply_register (regcache, first_fp + i, |
186947f7 DJ |
822 | regset[i & ~1].buf + 4 * (big_endian != (i & 1))); |
823 | ||
442ea881 | 824 | mips_supply_register_32bit (regcache, use_64bit, |
3aee8918 PA |
825 | find_regno (regcache->tdesc, "fcsr"), |
826 | regset[32].buf); | |
827 | mips_supply_register_32bit (regcache, use_64bit, | |
828 | find_regno (regcache->tdesc, "fir"), | |
186947f7 DJ |
829 | regset[32].buf + 4); |
830 | } | |
831 | #endif /* HAVE_PTRACE_GETREGS */ | |
832 | ||
3aee8918 | 833 | static struct regset_info mips_regsets[] = { |
186947f7 | 834 | #ifdef HAVE_PTRACE_GETREGS |
1570b33e | 835 | { PTRACE_GETREGS, PTRACE_SETREGS, 0, 38 * 8, GENERAL_REGS, |
186947f7 | 836 | mips_fill_gregset, mips_store_gregset }, |
1570b33e | 837 | { PTRACE_GETFPREGS, PTRACE_SETFPREGS, 0, 33 * 8, FP_REGS, |
186947f7 DJ |
838 | mips_fill_fpregset, mips_store_fpregset }, |
839 | #endif /* HAVE_PTRACE_GETREGS */ | |
50bc912a | 840 | NULL_REGSET |
186947f7 DJ |
841 | }; |
842 | ||
3aee8918 PA |
843 | static struct regsets_info mips_regsets_info = |
844 | { | |
845 | mips_regsets, /* regsets */ | |
846 | 0, /* num_regsets */ | |
847 | NULL, /* disabled_regsets */ | |
848 | }; | |
849 | ||
850 | static struct usrregs_info mips_dsp_usrregs_info = | |
851 | { | |
852 | mips_dsp_num_regs, | |
853 | mips_dsp_regmap, | |
854 | }; | |
855 | ||
856 | static struct usrregs_info mips_usrregs_info = | |
857 | { | |
858 | mips_num_regs, | |
859 | mips_regmap, | |
860 | }; | |
861 | ||
862 | static struct regs_info dsp_regs_info = | |
863 | { | |
864 | mips_dsp_regset_bitmap, | |
865 | &mips_dsp_usrregs_info, | |
866 | &mips_regsets_info | |
867 | }; | |
868 | ||
869 | static struct regs_info regs_info = | |
870 | { | |
871 | NULL, /* regset_bitmap */ | |
872 | &mips_usrregs_info, | |
873 | &mips_regsets_info | |
874 | }; | |
875 | ||
876 | static const struct regs_info * | |
877 | mips_regs_info (void) | |
878 | { | |
879 | if (have_dsp) | |
880 | return &dsp_regs_info; | |
881 | else | |
882 | return ®s_info; | |
883 | } | |
884 | ||
2ec06d2e | 885 | struct linux_target_ops the_low_target = { |
1faeff08 | 886 | mips_arch_setup, |
3aee8918 | 887 | mips_regs_info, |
2ec06d2e DJ |
888 | mips_cannot_fetch_register, |
889 | mips_cannot_store_register, | |
c14dfd32 | 890 | NULL, /* fetch_register */ |
0d62e5e8 DJ |
891 | mips_get_pc, |
892 | mips_set_pc, | |
dd373349 AT |
893 | NULL, /* breakpoint_kind_from_pc */ |
894 | mips_sw_breakpoint_from_kind, | |
0d62e5e8 DJ |
895 | mips_reinsert_addr, |
896 | 0, | |
897 | mips_breakpoint_at, | |
802e8e6d | 898 | mips_supports_z_point_type, |
7a60ad40 YQ |
899 | mips_insert_point, |
900 | mips_remove_point, | |
901 | mips_stopped_by_watchpoint, | |
902 | mips_stopped_data_address, | |
903 | NULL, | |
904 | NULL, | |
905 | NULL, /* siginfo_fixup */ | |
906 | mips_linux_new_process, | |
907 | mips_linux_new_thread, | |
3a8a0396 | 908 | mips_linux_new_fork, |
7a60ad40 | 909 | mips_linux_prepare_to_resume |
2ec06d2e | 910 | }; |
3aee8918 PA |
911 | |
912 | void | |
913 | initialize_low_arch (void) | |
914 | { | |
915 | /* Initialize the Linux target descriptions. */ | |
916 | init_registers_mips_linux (); | |
917 | init_registers_mips_dsp_linux (); | |
918 | init_registers_mips64_linux (); | |
919 | init_registers_mips64_dsp_linux (); | |
920 | ||
921 | initialize_regsets_info (&mips_regsets_info); | |
922 | } |