Commit | Line | Data |
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da59e081 | 1 | /* Low level interface to i386 running the GNU Hurd. |
f6052080 | 2 | |
ecd75fc8 | 3 | Copyright (C) 1992-2014 Free Software Foundation, Inc. |
c906108c | 4 | |
c5aa993b | 5 | This file is part of GDB. |
c906108c | 6 | |
c5aa993b JM |
7 | This program is free software; you can redistribute it and/or modify |
8 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 9 | the Free Software Foundation; either version 3 of the License, or |
c5aa993b | 10 | (at your option) any later version. |
c906108c | 11 | |
c5aa993b JM |
12 | This program is distributed in the hope that it will be useful, |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
c906108c | 16 | |
c5aa993b | 17 | You should have received a copy of the GNU General Public License |
a9762ec7 | 18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
c906108c SS |
19 | |
20 | #include "defs.h" | |
05db5edd | 21 | #include "x86-nat.h" |
c906108c SS |
22 | #include "inferior.h" |
23 | #include "floatformat.h" | |
4e052eda | 24 | #include "regcache.h" |
c906108c | 25 | |
c906108c | 26 | #include <mach.h> |
da59e081 | 27 | #include <mach_error.h> |
c906108c SS |
28 | #include <mach/message.h> |
29 | #include <mach/exception.h> | |
c906108c | 30 | |
4604bcad MK |
31 | #include "i386-tdep.h" |
32 | ||
c906108c | 33 | #include "gnu-nat.h" |
05db5edd | 34 | #include "inf-child.h" |
e750d25e | 35 | #include "i387-tdep.h" |
c906108c | 36 | |
57e76fac MS |
37 | #ifdef HAVE_SYS_PROCFS_H |
38 | # include <sys/procfs.h> | |
39 | # include "gregset.h" | |
40 | #endif | |
c906108c | 41 | |
da59e081 JM |
42 | /* Offset to the thread_state_t location where REG is stored. */ |
43 | #define REG_OFFSET(reg) offsetof (struct i386_thread_state, reg) | |
c906108c | 44 | |
383d750b MK |
45 | /* At REG_OFFSET[N] is the offset to the thread_state_t location where |
46 | the GDB register N is stored. */ | |
c5aa993b | 47 | static int reg_offset[] = |
c906108c | 48 | { |
c5aa993b JM |
49 | REG_OFFSET (eax), REG_OFFSET (ecx), REG_OFFSET (edx), REG_OFFSET (ebx), |
50 | REG_OFFSET (uesp), REG_OFFSET (ebp), REG_OFFSET (esi), REG_OFFSET (edi), | |
51 | REG_OFFSET (eip), REG_OFFSET (efl), REG_OFFSET (cs), REG_OFFSET (ss), | |
52 | REG_OFFSET (ds), REG_OFFSET (es), REG_OFFSET (fs), REG_OFFSET (gs) | |
c906108c SS |
53 | }; |
54 | ||
ecccb813 TS |
55 | /* Offset to the greg_t location where REG is stored. */ |
56 | #define CREG_OFFSET(reg) (REG_##reg * 4) | |
57 | ||
58 | /* At CREG_OFFSET[N] is the offset to the greg_t location where | |
59 | the GDB register N is stored. */ | |
60 | static int creg_offset[] = | |
61 | { | |
62 | CREG_OFFSET (EAX), CREG_OFFSET (ECX), CREG_OFFSET (EDX), CREG_OFFSET (EBX), | |
63 | CREG_OFFSET (UESP), CREG_OFFSET (EBP), CREG_OFFSET (ESI), CREG_OFFSET (EDI), | |
64 | CREG_OFFSET (EIP), CREG_OFFSET (EFL), CREG_OFFSET (CS), CREG_OFFSET (SS), | |
65 | CREG_OFFSET (DS), CREG_OFFSET (ES), CREG_OFFSET (FS), CREG_OFFSET (GS) | |
66 | }; | |
67 | ||
da59e081 | 68 | #define REG_ADDR(state, regnum) ((char *)(state) + reg_offset[regnum]) |
ecccb813 | 69 | #define CREG_ADDR(state, regnum) ((const char *)(state) + creg_offset[regnum]) |
da59e081 | 70 | |
c906108c | 71 | \f |
3303a276 MK |
72 | /* Get the whole floating-point state of THREAD and record the values |
73 | of the corresponding (pseudo) registers. */ | |
74 | ||
da59e081 | 75 | static void |
56be3814 | 76 | fetch_fpregs (struct regcache *regcache, struct proc *thread) |
c906108c | 77 | { |
da59e081 JM |
78 | mach_msg_type_number_t count = i386_FLOAT_STATE_COUNT; |
79 | struct i386_float_state state; | |
da59e081 | 80 | error_t err; |
c906108c | 81 | |
da59e081 JM |
82 | err = thread_get_state (thread->port, i386_FLOAT_STATE, |
83 | (thread_state_t) &state, &count); | |
84 | if (err) | |
c906108c | 85 | { |
8a3fe4f8 | 86 | warning (_("Couldn't fetch floating-point state from %s"), |
da59e081 JM |
87 | proc_string (thread)); |
88 | return; | |
c906108c | 89 | } |
da59e081 | 90 | |
383d750b | 91 | if (!state.initialized) |
c906108c | 92 | { |
3303a276 | 93 | /* The floating-point state isn't initialized. */ |
56be3814 | 94 | i387_supply_fsave (regcache, -1, NULL); |
3303a276 MK |
95 | } |
96 | else | |
97 | { | |
98 | /* Supply the floating-point registers. */ | |
56be3814 | 99 | i387_supply_fsave (regcache, -1, state.hw_state); |
c906108c SS |
100 | } |
101 | } | |
da59e081 | 102 | |
57e76fac MS |
103 | #ifdef HAVE_SYS_PROCFS_H |
104 | /* These two calls are used by the core-regset.c code for | |
105 | reading ELF core files. */ | |
106 | void | |
7f7fe91e | 107 | supply_gregset (struct regcache *regcache, const gdb_gregset_t *gregs) |
57e76fac MS |
108 | { |
109 | int i; | |
65e78234 | 110 | for (i = 0; i < I386_NUM_GREGS; i++) |
7f7fe91e | 111 | regcache_raw_supply (regcache, i, CREG_ADDR (gregs, i)); |
57e76fac MS |
112 | } |
113 | ||
114 | void | |
7f7fe91e | 115 | supply_fpregset (struct regcache *regcache, const gdb_fpregset_t *fpregs) |
57e76fac | 116 | { |
7f7fe91e | 117 | i387_supply_fsave (regcache, -1, fpregs); |
57e76fac MS |
118 | } |
119 | #endif | |
120 | ||
da59e081 | 121 | /* Fetch register REGNO, or all regs if REGNO is -1. */ |
b4d1e8c7 | 122 | static void |
85a772a5 TS |
123 | gnu_fetch_registers (struct target_ops *ops, |
124 | struct regcache *regcache, int regno) | |
c906108c SS |
125 | { |
126 | struct proc *thread; | |
c5aa993b | 127 | |
da59e081 | 128 | /* Make sure we know about new threads. */ |
c289427b | 129 | inf_update_procs (gnu_current_inf); |
c906108c | 130 | |
c289427b | 131 | thread = inf_tid_to_thread (gnu_current_inf, |
ca08a94c | 132 | ptid_get_lwp (inferior_ptid)); |
c5aa993b | 133 | if (!thread) |
617fd3b5 PA |
134 | error (_("Can't fetch registers from thread %s: No such thread"), |
135 | target_pid_to_str (inferior_ptid)); | |
c906108c | 136 | |
65e78234 | 137 | if (regno < I386_NUM_GREGS || regno == -1) |
c906108c | 138 | { |
da59e081 | 139 | thread_state_t state; |
383d750b | 140 | |
da59e081 JM |
141 | /* This does the dirty work for us. */ |
142 | state = proc_get_state (thread, 0); | |
143 | if (!state) | |
c906108c | 144 | { |
8a3fe4f8 | 145 | warning (_("Couldn't fetch registers from %s"), |
da59e081 JM |
146 | proc_string (thread)); |
147 | return; | |
c906108c SS |
148 | } |
149 | ||
da59e081 | 150 | if (regno == -1) |
c906108c | 151 | { |
da59e081 | 152 | int i; |
383d750b | 153 | |
da59e081 | 154 | proc_debug (thread, "fetching all register"); |
383d750b | 155 | |
65e78234 | 156 | for (i = 0; i < I386_NUM_GREGS; i++) |
56be3814 | 157 | regcache_raw_supply (regcache, i, REG_ADDR (state, i)); |
da59e081 | 158 | thread->fetched_regs = ~0; |
c906108c SS |
159 | } |
160 | else | |
161 | { | |
c9f4d572 | 162 | proc_debug (thread, "fetching register %s", |
875f8d0e UW |
163 | gdbarch_register_name (get_regcache_arch (regcache), |
164 | regno)); | |
383d750b | 165 | |
56be3814 | 166 | regcache_raw_supply (regcache, regno, |
23a6d369 | 167 | REG_ADDR (state, regno)); |
da59e081 | 168 | thread->fetched_regs |= (1 << regno); |
c906108c SS |
169 | } |
170 | } | |
da59e081 | 171 | |
65e78234 | 172 | if (regno >= I386_NUM_GREGS || regno == -1) |
da59e081 JM |
173 | { |
174 | proc_debug (thread, "fetching floating-point registers"); | |
383d750b | 175 | |
56be3814 | 176 | fetch_fpregs (regcache, thread); |
da59e081 | 177 | } |
c906108c SS |
178 | } |
179 | \f | |
da59e081 JM |
180 | |
181 | /* Store the whole floating-point state into THREAD using information | |
182 | from the corresponding (pseudo) registers. */ | |
183 | static void | |
56be3814 | 184 | store_fpregs (const struct regcache *regcache, struct proc *thread, int regno) |
da59e081 JM |
185 | { |
186 | mach_msg_type_number_t count = i386_FLOAT_STATE_COUNT; | |
187 | struct i386_float_state state; | |
188 | error_t err; | |
c5aa993b | 189 | |
da59e081 JM |
190 | err = thread_get_state (thread->port, i386_FLOAT_STATE, |
191 | (thread_state_t) &state, &count); | |
192 | if (err) | |
c906108c | 193 | { |
8a3fe4f8 | 194 | warning (_("Couldn't fetch floating-point state from %s"), |
da59e081 JM |
195 | proc_string (thread)); |
196 | return; | |
c906108c | 197 | } |
c5aa993b | 198 | |
383d750b | 199 | /* FIXME: kettenis/2001-07-15: Is this right? Should we somehow |
8262ee23 | 200 | take into account DEPRECATED_REGISTER_VALID like the old code did? */ |
56be3814 | 201 | i387_collect_fsave (regcache, regno, state.hw_state); |
383d750b | 202 | |
da59e081 JM |
203 | err = thread_set_state (thread->port, i386_FLOAT_STATE, |
204 | (thread_state_t) &state, i386_FLOAT_STATE_COUNT); | |
205 | if (err) | |
c906108c | 206 | { |
8a3fe4f8 | 207 | warning (_("Couldn't store floating-point state into %s"), |
da59e081 JM |
208 | proc_string (thread)); |
209 | return; | |
c906108c | 210 | } |
c906108c | 211 | } |
c5aa993b | 212 | |
da59e081 | 213 | /* Store at least register REGNO, or all regs if REGNO == -1. */ |
b4d1e8c7 | 214 | static void |
85a772a5 TS |
215 | gnu_store_registers (struct target_ops *ops, |
216 | struct regcache *regcache, int regno) | |
c5aa993b | 217 | { |
da59e081 | 218 | struct proc *thread; |
875f8d0e | 219 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
c906108c | 220 | |
da59e081 | 221 | /* Make sure we know about new threads. */ |
c289427b | 222 | inf_update_procs (gnu_current_inf); |
c5aa993b | 223 | |
c289427b | 224 | thread = inf_tid_to_thread (gnu_current_inf, |
ca08a94c | 225 | ptid_get_lwp (inferior_ptid)); |
c906108c | 226 | if (!thread) |
617fd3b5 PA |
227 | error (_("Couldn't store registers into thread %s: No such thread"), |
228 | target_pid_to_str (inferior_ptid)); | |
c906108c | 229 | |
65e78234 | 230 | if (regno < I386_NUM_GREGS || regno == -1) |
c906108c | 231 | { |
da59e081 JM |
232 | thread_state_t state; |
233 | thread_state_data_t old_state; | |
234 | int was_aborted = thread->aborted; | |
235 | int was_valid = thread->state_valid; | |
fb557744 | 236 | int trace; |
c906108c | 237 | |
da59e081 JM |
238 | if (!was_aborted && was_valid) |
239 | memcpy (&old_state, &thread->state, sizeof (old_state)); | |
c906108c | 240 | |
da59e081 JM |
241 | state = proc_get_state (thread, 1); |
242 | if (!state) | |
243 | { | |
1777feb0 MS |
244 | warning (_("Couldn't store registers into %s"), |
245 | proc_string (thread)); | |
da59e081 JM |
246 | return; |
247 | } | |
c906108c | 248 | |
fb557744 MK |
249 | /* Save the T bit. We might try to restore the %eflags register |
250 | below, but changing the T bit would seriously confuse GDB. */ | |
251 | trace = ((struct i386_thread_state *)state)->efl & 0x100; | |
252 | ||
da59e081 JM |
253 | if (!was_aborted && was_valid) |
254 | /* See which registers have changed after aborting the thread. */ | |
255 | { | |
256 | int check_regno; | |
257 | ||
65e78234 | 258 | for (check_regno = 0; check_regno < I386_NUM_GREGS; check_regno++) |
da59e081 JM |
259 | if ((thread->fetched_regs & (1 << check_regno)) |
260 | && memcpy (REG_ADDR (&old_state, check_regno), | |
261 | REG_ADDR (state, check_regno), | |
875f8d0e | 262 | register_size (gdbarch, check_regno))) |
da59e081 JM |
263 | /* Register CHECK_REGNO has changed! Ack! */ |
264 | { | |
8a3fe4f8 | 265 | warning (_("Register %s changed after the thread was aborted"), |
875f8d0e | 266 | gdbarch_register_name (gdbarch, check_regno)); |
da59e081 | 267 | if (regno >= 0 && regno != check_regno) |
383d750b | 268 | /* Update GDB's copy of the register. */ |
f6052080 | 269 | regcache_raw_supply (regcache, check_regno, |
23a6d369 | 270 | REG_ADDR (state, check_regno)); |
da59e081 | 271 | else |
1777feb0 MS |
272 | warning (_("... also writing this register! " |
273 | "Suspicious...")); | |
da59e081 JM |
274 | } |
275 | } | |
c906108c | 276 | |
da59e081 JM |
277 | if (regno == -1) |
278 | { | |
279 | int i; | |
383d750b | 280 | |
da59e081 | 281 | proc_debug (thread, "storing all registers"); |
c5aa993b | 282 | |
65e78234 | 283 | for (i = 0; i < I386_NUM_GREGS; i++) |
672c9795 | 284 | if (REG_VALID == regcache_register_status (regcache, i)) |
9b8607ce | 285 | regcache_raw_collect (regcache, i, REG_ADDR (state, i)); |
da59e081 JM |
286 | } |
287 | else | |
288 | { | |
c9f4d572 | 289 | proc_debug (thread, "storing register %s", |
875f8d0e | 290 | gdbarch_register_name (gdbarch, regno)); |
c906108c | 291 | |
672c9795 | 292 | gdb_assert (REG_VALID == regcache_register_status (regcache, regno)); |
ecac404d | 293 | regcache_raw_collect (regcache, regno, REG_ADDR (state, regno)); |
da59e081 | 294 | } |
fb557744 MK |
295 | |
296 | /* Restore the T bit. */ | |
297 | ((struct i386_thread_state *)state)->efl &= ~0x100; | |
298 | ((struct i386_thread_state *)state)->efl |= trace; | |
c906108c | 299 | } |
c5aa993b | 300 | |
65e78234 | 301 | if (regno >= I386_NUM_GREGS || regno == -1) |
da59e081 JM |
302 | { |
303 | proc_debug (thread, "storing floating-point registers"); | |
383d750b | 304 | |
56be3814 | 305 | store_fpregs (regcache, thread, regno); |
da59e081 | 306 | } |
c906108c | 307 | } |
b4d1e8c7 | 308 | |
05db5edd ST |
309 | \f |
310 | /* Support for debug registers. */ | |
311 | ||
312 | #ifdef i386_DEBUG_STATE | |
313 | /* Get debug registers for thread THREAD. */ | |
314 | ||
315 | static void | |
316 | i386_gnu_dr_get (struct i386_debug_state *regs, struct proc *thread) | |
317 | { | |
318 | mach_msg_type_number_t count = i386_DEBUG_STATE_COUNT; | |
319 | error_t err; | |
320 | ||
321 | err = thread_get_state (thread->port, i386_DEBUG_STATE, | |
322 | (thread_state_t) regs, &count); | |
323 | if (err != 0 || count != i386_DEBUG_STATE_COUNT) | |
324 | warning (_("Couldn't fetch debug state from %s"), | |
325 | proc_string (thread)); | |
326 | } | |
327 | ||
328 | /* Set debug registers for thread THREAD. */ | |
329 | ||
330 | static void | |
331 | i386_gnu_dr_set (const struct i386_debug_state *regs, struct proc *thread) | |
332 | { | |
333 | error_t err; | |
334 | ||
335 | err = thread_set_state (thread->port, i386_DEBUG_STATE, | |
336 | (thread_state_t) regs, i386_DEBUG_STATE_COUNT); | |
337 | if (err != 0) | |
338 | warning (_("Couldn't store debug state into %s"), | |
339 | proc_string (thread)); | |
340 | } | |
341 | ||
342 | /* Set DR_CONTROL in THREAD. */ | |
343 | ||
344 | static void | |
345 | i386_gnu_dr_set_control_one (struct proc *thread, void *arg) | |
346 | { | |
347 | unsigned long *control = arg; | |
348 | struct i386_debug_state regs; | |
349 | ||
350 | i386_gnu_dr_get (®s, thread); | |
351 | regs.dr[DR_CONTROL] = *control; | |
352 | i386_gnu_dr_set (®s, thread); | |
353 | } | |
354 | ||
355 | /* Set DR_CONTROL to CONTROL in all threads. */ | |
356 | ||
357 | static void | |
358 | i386_gnu_dr_set_control (unsigned long control) | |
359 | { | |
360 | inf_update_procs (gnu_current_inf); | |
361 | inf_threads (gnu_current_inf, i386_gnu_dr_set_control_one, &control); | |
362 | } | |
363 | ||
364 | /* Parameters to set a debugging address. */ | |
365 | ||
366 | struct reg_addr | |
367 | { | |
368 | int regnum; /* Register number (zero based). */ | |
369 | CORE_ADDR addr; /* Address. */ | |
370 | }; | |
371 | ||
372 | /* Set address REGNUM (zero based) to ADDR in THREAD. */ | |
373 | ||
374 | static void | |
375 | i386_gnu_dr_set_addr_one (struct proc *thread, void *arg) | |
376 | { | |
377 | struct reg_addr *reg_addr = arg; | |
378 | struct i386_debug_state regs; | |
379 | ||
380 | i386_gnu_dr_get (®s, thread); | |
381 | regs.dr[reg_addr->regnum] = reg_addr->addr; | |
382 | i386_gnu_dr_set (®s, thread); | |
383 | } | |
384 | ||
385 | /* Set address REGNUM (zero based) to ADDR in all threads. */ | |
386 | ||
387 | static void | |
388 | i386_gnu_dr_set_addr (int regnum, CORE_ADDR addr) | |
389 | { | |
390 | struct reg_addr reg_addr; | |
391 | ||
392 | gdb_assert (DR_FIRSTADDR <= regnum && regnum <= DR_LASTADDR); | |
393 | ||
394 | reg_addr.regnum = regnum; | |
395 | reg_addr.addr = addr; | |
396 | ||
397 | inf_update_procs (gnu_current_inf); | |
398 | inf_threads (gnu_current_inf, i386_gnu_dr_set_addr_one, ®_addr); | |
399 | } | |
400 | ||
401 | /* Get debug register REGNUM value from only the one LWP of PTID. */ | |
402 | ||
403 | static unsigned long | |
404 | i386_gnu_dr_get_reg (ptid_t ptid, int regnum) | |
405 | { | |
406 | struct i386_debug_state regs; | |
407 | struct proc *thread; | |
408 | ||
409 | /* Make sure we know about new threads. */ | |
410 | inf_update_procs (gnu_current_inf); | |
411 | ||
412 | thread = inf_tid_to_thread (gnu_current_inf, ptid_get_lwp (ptid)); | |
413 | i386_gnu_dr_get (®s, thread); | |
414 | ||
415 | return regs.dr[regnum]; | |
416 | } | |
417 | ||
418 | /* Return the inferior's debug register REGNUM. */ | |
419 | ||
420 | static CORE_ADDR | |
421 | i386_gnu_dr_get_addr (int regnum) | |
422 | { | |
423 | gdb_assert (DR_FIRSTADDR <= regnum && regnum <= DR_LASTADDR); | |
424 | ||
425 | return i386_gnu_dr_get_reg (inferior_ptid, regnum); | |
426 | } | |
427 | ||
428 | /* Get DR_STATUS from only the one thread of INFERIOR_PTID. */ | |
429 | ||
430 | static unsigned long | |
431 | i386_gnu_dr_get_status (void) | |
432 | { | |
433 | return i386_gnu_dr_get_reg (inferior_ptid, DR_STATUS); | |
434 | } | |
435 | ||
436 | /* Return the inferior's DR7 debug control register. */ | |
437 | ||
438 | static unsigned long | |
439 | i386_gnu_dr_get_control (void) | |
440 | { | |
441 | return i386_gnu_dr_get_reg (inferior_ptid, DR_CONTROL); | |
442 | } | |
443 | #endif /* i386_DEBUG_STATE */ | |
444 | ||
b4d1e8c7 PA |
445 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
446 | extern initialize_file_ftype _initialize_i386gnu_nat; | |
447 | ||
448 | void | |
449 | _initialize_i386gnu_nat (void) | |
450 | { | |
451 | struct target_ops *t; | |
452 | ||
453 | /* Fill in the generic GNU/Hurd methods. */ | |
454 | t = gnu_target (); | |
455 | ||
05db5edd ST |
456 | #ifdef i386_DEBUG_STATE |
457 | x86_use_watchpoints (t); | |
458 | ||
459 | x86_dr_low.set_control = i386_gnu_dr_set_control; | |
460 | gdb_assert (DR_FIRSTADDR == 0 && DR_LASTADDR < i386_DEBUG_STATE_COUNT); | |
461 | x86_dr_low.set_addr = i386_gnu_dr_set_addr; | |
462 | x86_dr_low.get_addr = i386_gnu_dr_get_addr; | |
463 | x86_dr_low.get_status = i386_gnu_dr_get_status; | |
464 | x86_dr_low.get_control = i386_gnu_dr_get_control; | |
465 | x86_set_debug_register_length (4); | |
466 | #endif /* i386_DEBUG_STATE */ | |
467 | ||
b4d1e8c7 PA |
468 | t->to_fetch_registers = gnu_fetch_registers; |
469 | t->to_store_registers = gnu_store_registers; | |
470 | ||
471 | /* Register the target. */ | |
472 | add_target (t); | |
473 | } |