Commit | Line | Data |
---|---|---|
a4b6fc86 AC |
1 | /* Native-dependent code for GNU/Linux x86. |
2 | ||
975aec09 | 3 | Copyright 1999, 2000, 2001, 2002 Free Software Foundation, Inc. |
d4f3574e | 4 | |
04cd15b6 | 5 | This file is part of GDB. |
d4f3574e | 6 | |
04cd15b6 MK |
7 | This program is free software; you can redistribute it and/or modify |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 2 of the License, or | |
10 | (at your option) any later version. | |
d4f3574e | 11 | |
04cd15b6 MK |
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. | |
d4f3574e | 16 | |
04cd15b6 MK |
17 | You should have received a copy of the GNU General Public License |
18 | along with this program; if not, write to the Free Software | |
19 | Foundation, Inc., 59 Temple Place - Suite 330, | |
20 | Boston, MA 02111-1307, USA. */ | |
d4f3574e SS |
21 | |
22 | #include "defs.h" | |
23 | #include "inferior.h" | |
24 | #include "gdbcore.h" | |
4e052eda | 25 | #include "regcache.h" |
d4f3574e | 26 | |
84346e11 | 27 | #include "gdb_assert.h" |
d4f3574e SS |
28 | #include <sys/ptrace.h> |
29 | #include <sys/user.h> | |
30 | #include <sys/procfs.h> | |
31 | ||
32 | #ifdef HAVE_SYS_REG_H | |
33 | #include <sys/reg.h> | |
34 | #endif | |
35 | ||
84346e11 MK |
36 | #ifdef HAVE_SYS_DEBUGREG_H |
37 | #include <sys/debugreg.h> | |
38 | #endif | |
39 | ||
40 | #ifndef DR_FIRSTADDR | |
41 | #define DR_FIRSTADDR 0 | |
42 | #endif | |
43 | ||
44 | #ifndef DR_LASTADDR | |
45 | #define DR_LASTADDR 3 | |
46 | #endif | |
47 | ||
48 | #ifndef DR_STATUS | |
49 | #define DR_STATUS 6 | |
50 | #endif | |
51 | ||
52 | #ifndef DR_CONTROL | |
53 | #define DR_CONTROL 7 | |
54 | #endif | |
55 | ||
6ce2ac0b | 56 | /* Prototypes for supply_gregset etc. */ |
c60c0f5f MS |
57 | #include "gregset.h" |
58 | ||
6ce2ac0b | 59 | /* Prototypes for i387_supply_fsave etc. */ |
e750d25e | 60 | #include "i387-tdep.h" |
6ce2ac0b | 61 | |
c3833324 MS |
62 | /* Defines for XMM0_REGNUM etc. */ |
63 | #include "i386-tdep.h" | |
64 | ||
5179e78f AC |
65 | /* Defines I386_LINUX_ORIG_EAX_REGNUM. */ |
66 | #include "i386-linux-tdep.h" | |
67 | ||
756ed206 MK |
68 | /* Prototypes for local functions. */ |
69 | static void dummy_sse_values (void); | |
70 | ||
6ce2ac0b | 71 | \f |
d4f3574e | 72 | |
a4b6fc86 AC |
73 | /* The register sets used in GNU/Linux ELF core-dumps are identical to |
74 | the register sets in `struct user' that is used for a.out | |
75 | core-dumps, and is also used by `ptrace'. The corresponding types | |
76 | are `elf_gregset_t' for the general-purpose registers (with | |
04cd15b6 MK |
77 | `elf_greg_t' the type of a single GP register) and `elf_fpregset_t' |
78 | for the floating-point registers. | |
79 | ||
80 | Those types used to be available under the names `gregset_t' and | |
81 | `fpregset_t' too, and this file used those names in the past. But | |
82 | those names are now used for the register sets used in the | |
83 | `mcontext_t' type, and have a different size and layout. */ | |
84 | ||
85 | /* Mapping between the general-purpose registers in `struct user' | |
86 | format and GDB's register array layout. */ | |
d4f3574e SS |
87 | static int regmap[] = |
88 | { | |
89 | EAX, ECX, EDX, EBX, | |
90 | UESP, EBP, ESI, EDI, | |
91 | EIP, EFL, CS, SS, | |
04cd15b6 | 92 | DS, ES, FS, GS |
d4f3574e SS |
93 | }; |
94 | ||
5c44784c JM |
95 | /* Which ptrace request retrieves which registers? |
96 | These apply to the corresponding SET requests as well. */ | |
97 | #define GETREGS_SUPPLIES(regno) \ | |
3fb1c838 | 98 | ((0 <= (regno) && (regno) <= 15) || (regno) == I386_LINUX_ORIG_EAX_REGNUM) |
5c44784c JM |
99 | #define GETFPREGS_SUPPLIES(regno) \ |
100 | (FP0_REGNUM <= (regno) && (regno) <= LAST_FPU_CTRL_REGNUM) | |
6ce2ac0b | 101 | #define GETFPXREGS_SUPPLIES(regno) \ |
5c44784c JM |
102 | (FP0_REGNUM <= (regno) && (regno) <= MXCSR_REGNUM) |
103 | ||
f60300e7 MK |
104 | /* Does the current host support the GETREGS request? */ |
105 | int have_ptrace_getregs = | |
106 | #ifdef HAVE_PTRACE_GETREGS | |
107 | 1 | |
108 | #else | |
109 | 0 | |
110 | #endif | |
111 | ; | |
112 | ||
6ce2ac0b | 113 | /* Does the current host support the GETFPXREGS request? The header |
5c44784c JM |
114 | file may or may not define it, and even if it is defined, the |
115 | kernel will return EIO if it's running on a pre-SSE processor. | |
116 | ||
117 | My instinct is to attach this to some architecture- or | |
118 | target-specific data structure, but really, a particular GDB | |
119 | process can only run on top of one kernel at a time. So it's okay | |
120 | for this to be a simple variable. */ | |
6ce2ac0b MK |
121 | int have_ptrace_getfpxregs = |
122 | #ifdef HAVE_PTRACE_GETFPXREGS | |
5c44784c JM |
123 | 1 |
124 | #else | |
125 | 0 | |
126 | #endif | |
127 | ; | |
f60300e7 | 128 | \f |
6ce2ac0b | 129 | |
84346e11 MK |
130 | /* Support for the user struct. */ |
131 | ||
132 | /* Return the address of register REGNUM. BLOCKEND is the value of | |
133 | u.u_ar0, which should point to the registers. */ | |
134 | ||
135 | CORE_ADDR | |
136 | register_u_addr (CORE_ADDR blockend, int regnum) | |
137 | { | |
138 | return (blockend + 4 * regmap[regnum]); | |
139 | } | |
140 | ||
141 | /* Return the size of the user struct. */ | |
142 | ||
143 | int | |
144 | kernel_u_size (void) | |
145 | { | |
146 | return (sizeof (struct user)); | |
147 | } | |
148 | \f | |
149 | ||
97780f5f JB |
150 | /* Fetching registers directly from the U area, one at a time. */ |
151 | ||
f60300e7 MK |
152 | /* FIXME: kettenis/2000-03-05: This duplicates code from `inptrace.c'. |
153 | The problem is that we define FETCH_INFERIOR_REGISTERS since we | |
154 | want to use our own versions of {fetch,store}_inferior_registers | |
155 | that use the GETREGS request. This means that the code in | |
156 | `infptrace.c' is #ifdef'd out. But we need to fall back on that | |
157 | code when GDB is running on top of a kernel that doesn't support | |
158 | the GETREGS request. I want to avoid changing `infptrace.c' right | |
159 | now. */ | |
160 | ||
318b21ef MK |
161 | #ifndef PT_READ_U |
162 | #define PT_READ_U PTRACE_PEEKUSR | |
163 | #endif | |
164 | #ifndef PT_WRITE_U | |
165 | #define PT_WRITE_U PTRACE_POKEUSR | |
166 | #endif | |
167 | ||
f60300e7 MK |
168 | /* Default the type of the ptrace transfer to int. */ |
169 | #ifndef PTRACE_XFER_TYPE | |
170 | #define PTRACE_XFER_TYPE int | |
171 | #endif | |
172 | ||
173 | /* Registers we shouldn't try to fetch. */ | |
98df6387 | 174 | #define OLD_CANNOT_FETCH_REGISTER(regno) ((regno) >= I386_NUM_GREGS) |
f60300e7 MK |
175 | |
176 | /* Fetch one register. */ | |
177 | ||
178 | static void | |
fba45db2 | 179 | fetch_register (int regno) |
f60300e7 MK |
180 | { |
181 | /* This isn't really an address. But ptrace thinks of it as one. */ | |
182 | CORE_ADDR regaddr; | |
183 | char mess[128]; /* For messages */ | |
184 | register int i; | |
185 | unsigned int offset; /* Offset of registers within the u area. */ | |
186 | char buf[MAX_REGISTER_RAW_SIZE]; | |
187 | int tid; | |
188 | ||
d5d65353 | 189 | if (OLD_CANNOT_FETCH_REGISTER (regno)) |
f60300e7 MK |
190 | { |
191 | memset (buf, '\0', REGISTER_RAW_SIZE (regno)); /* Supply zeroes */ | |
192 | supply_register (regno, buf); | |
193 | return; | |
194 | } | |
195 | ||
196 | /* Overload thread id onto process id */ | |
39f77062 KB |
197 | if ((tid = TIDGET (inferior_ptid)) == 0) |
198 | tid = PIDGET (inferior_ptid); /* no thread id, just use process id */ | |
f60300e7 MK |
199 | |
200 | offset = U_REGS_OFFSET; | |
201 | ||
202 | regaddr = register_addr (regno, offset); | |
203 | for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (PTRACE_XFER_TYPE)) | |
204 | { | |
205 | errno = 0; | |
206 | *(PTRACE_XFER_TYPE *) & buf[i] = ptrace (PT_READ_U, tid, | |
207 | (PTRACE_ARG3_TYPE) regaddr, 0); | |
208 | regaddr += sizeof (PTRACE_XFER_TYPE); | |
209 | if (errno != 0) | |
210 | { | |
211 | sprintf (mess, "reading register %s (#%d)", | |
212 | REGISTER_NAME (regno), regno); | |
213 | perror_with_name (mess); | |
214 | } | |
215 | } | |
216 | supply_register (regno, buf); | |
217 | } | |
218 | ||
219 | /* Fetch register values from the inferior. | |
220 | If REGNO is negative, do this for all registers. | |
221 | Otherwise, REGNO specifies which register (so we can save time). */ | |
222 | ||
223 | void | |
fba45db2 | 224 | old_fetch_inferior_registers (int regno) |
f60300e7 MK |
225 | { |
226 | if (regno >= 0) | |
227 | { | |
228 | fetch_register (regno); | |
229 | } | |
230 | else | |
231 | { | |
a728f042 | 232 | for (regno = 0; regno < NUM_REGS; regno++) |
f60300e7 MK |
233 | { |
234 | fetch_register (regno); | |
235 | } | |
236 | } | |
237 | } | |
238 | ||
239 | /* Registers we shouldn't try to store. */ | |
98df6387 | 240 | #define OLD_CANNOT_STORE_REGISTER(regno) ((regno) >= I386_NUM_GREGS) |
f60300e7 MK |
241 | |
242 | /* Store one register. */ | |
243 | ||
244 | static void | |
fba45db2 | 245 | store_register (int regno) |
f60300e7 MK |
246 | { |
247 | /* This isn't really an address. But ptrace thinks of it as one. */ | |
248 | CORE_ADDR regaddr; | |
249 | char mess[128]; /* For messages */ | |
250 | register int i; | |
251 | unsigned int offset; /* Offset of registers within the u area. */ | |
252 | int tid; | |
253 | ||
d5d65353 | 254 | if (OLD_CANNOT_STORE_REGISTER (regno)) |
f60300e7 MK |
255 | { |
256 | return; | |
257 | } | |
258 | ||
259 | /* Overload thread id onto process id */ | |
39f77062 KB |
260 | if ((tid = TIDGET (inferior_ptid)) == 0) |
261 | tid = PIDGET (inferior_ptid); /* no thread id, just use process id */ | |
f60300e7 MK |
262 | |
263 | offset = U_REGS_OFFSET; | |
264 | ||
265 | regaddr = register_addr (regno, offset); | |
266 | for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (PTRACE_XFER_TYPE)) | |
267 | { | |
268 | errno = 0; | |
269 | ptrace (PT_WRITE_U, tid, (PTRACE_ARG3_TYPE) regaddr, | |
270 | *(PTRACE_XFER_TYPE *) & registers[REGISTER_BYTE (regno) + i]); | |
271 | regaddr += sizeof (PTRACE_XFER_TYPE); | |
272 | if (errno != 0) | |
273 | { | |
274 | sprintf (mess, "writing register %s (#%d)", | |
275 | REGISTER_NAME (regno), regno); | |
276 | perror_with_name (mess); | |
277 | } | |
278 | } | |
279 | } | |
280 | ||
281 | /* Store our register values back into the inferior. | |
282 | If REGNO is negative, do this for all registers. | |
283 | Otherwise, REGNO specifies which register (so we can save time). */ | |
284 | ||
285 | void | |
fba45db2 | 286 | old_store_inferior_registers (int regno) |
f60300e7 MK |
287 | { |
288 | if (regno >= 0) | |
289 | { | |
290 | store_register (regno); | |
291 | } | |
292 | else | |
293 | { | |
a728f042 | 294 | for (regno = 0; regno < NUM_REGS; regno++) |
f60300e7 MK |
295 | { |
296 | store_register (regno); | |
297 | } | |
298 | } | |
299 | } | |
5c44784c | 300 | \f |
6ce2ac0b | 301 | |
04cd15b6 MK |
302 | /* Transfering the general-purpose registers between GDB, inferiors |
303 | and core files. */ | |
304 | ||
ad2a4d09 | 305 | /* Fill GDB's register array with the general-purpose register values |
04cd15b6 | 306 | in *GREGSETP. */ |
5c44784c | 307 | |
d4f3574e | 308 | void |
04cd15b6 | 309 | supply_gregset (elf_gregset_t *gregsetp) |
d4f3574e | 310 | { |
04cd15b6 | 311 | elf_greg_t *regp = (elf_greg_t *) gregsetp; |
6ce2ac0b | 312 | int i; |
d4f3574e | 313 | |
98df6387 | 314 | for (i = 0; i < I386_NUM_GREGS; i++) |
6ce2ac0b | 315 | supply_register (i, (char *) (regp + regmap[i])); |
3fb1c838 | 316 | |
82ea117a MK |
317 | if (I386_LINUX_ORIG_EAX_REGNUM < NUM_REGS) |
318 | supply_register (I386_LINUX_ORIG_EAX_REGNUM, (char *) (regp + ORIG_EAX)); | |
917317f4 JM |
319 | } |
320 | ||
04cd15b6 MK |
321 | /* Fill register REGNO (if it is a general-purpose register) in |
322 | *GREGSETPS with the value in GDB's register array. If REGNO is -1, | |
323 | do this for all registers. */ | |
6ce2ac0b | 324 | |
917317f4 | 325 | void |
04cd15b6 | 326 | fill_gregset (elf_gregset_t *gregsetp, int regno) |
917317f4 | 327 | { |
6ce2ac0b MK |
328 | elf_greg_t *regp = (elf_greg_t *) gregsetp; |
329 | int i; | |
04cd15b6 | 330 | |
98df6387 | 331 | for (i = 0; i < I386_NUM_GREGS; i++) |
099a9414 | 332 | if (regno == -1 || regno == i) |
8a406745 | 333 | regcache_collect (i, regp + regmap[i]); |
3fb1c838 | 334 | |
82ea117a MK |
335 | if ((regno == -1 || regno == I386_LINUX_ORIG_EAX_REGNUM) |
336 | && I386_LINUX_ORIG_EAX_REGNUM < NUM_REGS) | |
76fb44f4 | 337 | regcache_collect (I386_LINUX_ORIG_EAX_REGNUM, regp + ORIG_EAX); |
d4f3574e SS |
338 | } |
339 | ||
f60300e7 MK |
340 | #ifdef HAVE_PTRACE_GETREGS |
341 | ||
04cd15b6 MK |
342 | /* Fetch all general-purpose registers from process/thread TID and |
343 | store their values in GDB's register array. */ | |
d4f3574e | 344 | |
5c44784c | 345 | static void |
ed9a39eb | 346 | fetch_regs (int tid) |
5c44784c | 347 | { |
04cd15b6 | 348 | elf_gregset_t regs; |
5c44784c | 349 | |
6ce2ac0b | 350 | if (ptrace (PTRACE_GETREGS, tid, 0, (int) ®s) < 0) |
5c44784c | 351 | { |
f60300e7 MK |
352 | if (errno == EIO) |
353 | { | |
354 | /* The kernel we're running on doesn't support the GETREGS | |
355 | request. Reset `have_ptrace_getregs'. */ | |
356 | have_ptrace_getregs = 0; | |
357 | return; | |
358 | } | |
359 | ||
6ce2ac0b | 360 | perror_with_name ("Couldn't get registers"); |
5c44784c JM |
361 | } |
362 | ||
04cd15b6 | 363 | supply_gregset (®s); |
5c44784c JM |
364 | } |
365 | ||
04cd15b6 MK |
366 | /* Store all valid general-purpose registers in GDB's register array |
367 | into the process/thread specified by TID. */ | |
5c44784c | 368 | |
5c44784c | 369 | static void |
6ce2ac0b | 370 | store_regs (int tid, int regno) |
5c44784c | 371 | { |
04cd15b6 | 372 | elf_gregset_t regs; |
5c44784c | 373 | |
6ce2ac0b MK |
374 | if (ptrace (PTRACE_GETREGS, tid, 0, (int) ®s) < 0) |
375 | perror_with_name ("Couldn't get registers"); | |
5c44784c | 376 | |
6ce2ac0b MK |
377 | fill_gregset (®s, regno); |
378 | ||
379 | if (ptrace (PTRACE_SETREGS, tid, 0, (int) ®s) < 0) | |
380 | perror_with_name ("Couldn't write registers"); | |
5c44784c JM |
381 | } |
382 | ||
f60300e7 MK |
383 | #else |
384 | ||
385 | static void fetch_regs (int tid) {} | |
6ce2ac0b | 386 | static void store_regs (int tid, int regno) {} |
f60300e7 MK |
387 | |
388 | #endif | |
5c44784c | 389 | \f |
5c44784c | 390 | |
6ce2ac0b | 391 | /* Transfering floating-point registers between GDB, inferiors and cores. */ |
d4f3574e | 392 | |
04cd15b6 | 393 | /* Fill GDB's register array with the floating-point register values in |
917317f4 | 394 | *FPREGSETP. */ |
04cd15b6 | 395 | |
d4f3574e | 396 | void |
04cd15b6 | 397 | supply_fpregset (elf_fpregset_t *fpregsetp) |
d4f3574e | 398 | { |
6ce2ac0b | 399 | i387_supply_fsave ((char *) fpregsetp); |
756ed206 | 400 | dummy_sse_values (); |
917317f4 | 401 | } |
d4f3574e | 402 | |
04cd15b6 MK |
403 | /* Fill register REGNO (if it is a floating-point register) in |
404 | *FPREGSETP with the value in GDB's register array. If REGNO is -1, | |
405 | do this for all registers. */ | |
917317f4 JM |
406 | |
407 | void | |
04cd15b6 | 408 | fill_fpregset (elf_fpregset_t *fpregsetp, int regno) |
917317f4 | 409 | { |
6ce2ac0b | 410 | i387_fill_fsave ((char *) fpregsetp, regno); |
d4f3574e SS |
411 | } |
412 | ||
f60300e7 MK |
413 | #ifdef HAVE_PTRACE_GETREGS |
414 | ||
04cd15b6 MK |
415 | /* Fetch all floating-point registers from process/thread TID and store |
416 | thier values in GDB's register array. */ | |
917317f4 | 417 | |
d4f3574e | 418 | static void |
ed9a39eb | 419 | fetch_fpregs (int tid) |
d4f3574e | 420 | { |
04cd15b6 | 421 | elf_fpregset_t fpregs; |
d4f3574e | 422 | |
6ce2ac0b MK |
423 | if (ptrace (PTRACE_GETFPREGS, tid, 0, (int) &fpregs) < 0) |
424 | perror_with_name ("Couldn't get floating point status"); | |
d4f3574e | 425 | |
04cd15b6 | 426 | supply_fpregset (&fpregs); |
d4f3574e SS |
427 | } |
428 | ||
04cd15b6 MK |
429 | /* Store all valid floating-point registers in GDB's register array |
430 | into the process/thread specified by TID. */ | |
d4f3574e | 431 | |
d4f3574e | 432 | static void |
6ce2ac0b | 433 | store_fpregs (int tid, int regno) |
d4f3574e | 434 | { |
04cd15b6 | 435 | elf_fpregset_t fpregs; |
d4f3574e | 436 | |
6ce2ac0b MK |
437 | if (ptrace (PTRACE_GETFPREGS, tid, 0, (int) &fpregs) < 0) |
438 | perror_with_name ("Couldn't get floating point status"); | |
d4f3574e | 439 | |
6ce2ac0b | 440 | fill_fpregset (&fpregs, regno); |
d4f3574e | 441 | |
6ce2ac0b MK |
442 | if (ptrace (PTRACE_SETFPREGS, tid, 0, (int) &fpregs) < 0) |
443 | perror_with_name ("Couldn't write floating point status"); | |
d4f3574e SS |
444 | } |
445 | ||
f60300e7 MK |
446 | #else |
447 | ||
448 | static void fetch_fpregs (int tid) {} | |
6ce2ac0b | 449 | static void store_fpregs (int tid, int regno) {} |
f60300e7 MK |
450 | |
451 | #endif | |
5c44784c | 452 | \f |
d4f3574e | 453 | |
6ce2ac0b | 454 | /* Transfering floating-point and SSE registers to and from GDB. */ |
11cf8741 | 455 | |
6ce2ac0b | 456 | #ifdef HAVE_PTRACE_GETFPXREGS |
04cd15b6 MK |
457 | |
458 | /* Fill GDB's register array with the floating-point and SSE register | |
6ce2ac0b | 459 | values in *FPXREGSETP. */ |
04cd15b6 | 460 | |
975aec09 | 461 | void |
6ce2ac0b | 462 | supply_fpxregset (elf_fpxregset_t *fpxregsetp) |
d4f3574e | 463 | { |
6ce2ac0b | 464 | i387_supply_fxsave ((char *) fpxregsetp); |
d4f3574e SS |
465 | } |
466 | ||
6ce2ac0b MK |
467 | /* Fill register REGNO (if it is a floating-point or SSE register) in |
468 | *FPXREGSETP with the value in GDB's register array. If REGNO is | |
469 | -1, do this for all registers. */ | |
d4f3574e | 470 | |
975aec09 | 471 | void |
6ce2ac0b | 472 | fill_fpxregset (elf_fpxregset_t *fpxregsetp, int regno) |
d4f3574e | 473 | { |
6ce2ac0b | 474 | i387_fill_fxsave ((char *) fpxregsetp, regno); |
5c44784c JM |
475 | } |
476 | ||
6ce2ac0b | 477 | /* Fetch all registers covered by the PTRACE_GETFPXREGS request from |
04cd15b6 MK |
478 | process/thread TID and store their values in GDB's register array. |
479 | Return non-zero if successful, zero otherwise. */ | |
5c44784c | 480 | |
5c44784c | 481 | static int |
6ce2ac0b | 482 | fetch_fpxregs (int tid) |
5c44784c | 483 | { |
6ce2ac0b | 484 | elf_fpxregset_t fpxregs; |
5c44784c | 485 | |
6ce2ac0b | 486 | if (! have_ptrace_getfpxregs) |
5c44784c JM |
487 | return 0; |
488 | ||
6ce2ac0b | 489 | if (ptrace (PTRACE_GETFPXREGS, tid, 0, (int) &fpxregs) < 0) |
d4f3574e | 490 | { |
5c44784c JM |
491 | if (errno == EIO) |
492 | { | |
6ce2ac0b | 493 | have_ptrace_getfpxregs = 0; |
5c44784c JM |
494 | return 0; |
495 | } | |
496 | ||
6ce2ac0b | 497 | perror_with_name ("Couldn't read floating-point and SSE registers"); |
d4f3574e SS |
498 | } |
499 | ||
6ce2ac0b | 500 | supply_fpxregset (&fpxregs); |
5c44784c JM |
501 | return 1; |
502 | } | |
d4f3574e | 503 | |
04cd15b6 | 504 | /* Store all valid registers in GDB's register array covered by the |
6ce2ac0b | 505 | PTRACE_SETFPXREGS request into the process/thread specified by TID. |
04cd15b6 | 506 | Return non-zero if successful, zero otherwise. */ |
5c44784c | 507 | |
5c44784c | 508 | static int |
6ce2ac0b | 509 | store_fpxregs (int tid, int regno) |
5c44784c | 510 | { |
6ce2ac0b | 511 | elf_fpxregset_t fpxregs; |
5c44784c | 512 | |
6ce2ac0b | 513 | if (! have_ptrace_getfpxregs) |
5c44784c | 514 | return 0; |
6ce2ac0b MK |
515 | |
516 | if (ptrace (PTRACE_GETFPXREGS, tid, 0, &fpxregs) == -1) | |
2866d305 MK |
517 | { |
518 | if (errno == EIO) | |
519 | { | |
520 | have_ptrace_getfpxregs = 0; | |
521 | return 0; | |
522 | } | |
523 | ||
524 | perror_with_name ("Couldn't read floating-point and SSE registers"); | |
525 | } | |
5c44784c | 526 | |
6ce2ac0b | 527 | fill_fpxregset (&fpxregs, regno); |
5c44784c | 528 | |
6ce2ac0b MK |
529 | if (ptrace (PTRACE_SETFPXREGS, tid, 0, &fpxregs) == -1) |
530 | perror_with_name ("Couldn't write floating-point and SSE registers"); | |
5c44784c JM |
531 | |
532 | return 1; | |
533 | } | |
534 | ||
04cd15b6 | 535 | /* Fill the XMM registers in the register array with dummy values. For |
5c44784c JM |
536 | cases where we don't have access to the XMM registers. I think |
537 | this is cleaner than printing a warning. For a cleaner solution, | |
538 | we should gdbarchify the i386 family. */ | |
04cd15b6 | 539 | |
5c44784c | 540 | static void |
04cd15b6 | 541 | dummy_sse_values (void) |
5c44784c JM |
542 | { |
543 | /* C doesn't have a syntax for NaN's, so write it out as an array of | |
544 | longs. */ | |
545 | static long dummy[4] = { 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff }; | |
546 | static long mxcsr = 0x1f80; | |
547 | int reg; | |
548 | ||
549 | for (reg = 0; reg < 8; reg++) | |
550 | supply_register (XMM0_REGNUM + reg, (char *) dummy); | |
551 | supply_register (MXCSR_REGNUM, (char *) &mxcsr); | |
d4f3574e SS |
552 | } |
553 | ||
5c44784c JM |
554 | #else |
555 | ||
f0373401 MK |
556 | static int fetch_fpxregs (int tid) { return 0; } |
557 | static int store_fpxregs (int tid, int regno) { return 0; } | |
04cd15b6 | 558 | static void dummy_sse_values (void) {} |
5c44784c | 559 | |
6ce2ac0b | 560 | #endif /* HAVE_PTRACE_GETFPXREGS */ |
5c44784c | 561 | \f |
6ce2ac0b | 562 | |
5c44784c | 563 | /* Transferring arbitrary registers between GDB and inferior. */ |
d4f3574e | 564 | |
d5d65353 PS |
565 | /* Check if register REGNO in the child process is accessible. |
566 | If we are accessing registers directly via the U area, only the | |
567 | general-purpose registers are available. | |
568 | All registers should be accessible if we have GETREGS support. */ | |
569 | ||
570 | int | |
571 | cannot_fetch_register (int regno) | |
572 | { | |
573 | if (! have_ptrace_getregs) | |
574 | return OLD_CANNOT_FETCH_REGISTER (regno); | |
575 | return 0; | |
576 | } | |
577 | int | |
578 | cannot_store_register (int regno) | |
579 | { | |
580 | if (! have_ptrace_getregs) | |
581 | return OLD_CANNOT_STORE_REGISTER (regno); | |
582 | return 0; | |
583 | } | |
584 | ||
04cd15b6 MK |
585 | /* Fetch register REGNO from the child process. If REGNO is -1, do |
586 | this for all registers (including the floating point and SSE | |
587 | registers). */ | |
d4f3574e SS |
588 | |
589 | void | |
917317f4 | 590 | fetch_inferior_registers (int regno) |
d4f3574e | 591 | { |
ed9a39eb JM |
592 | int tid; |
593 | ||
f60300e7 MK |
594 | /* Use the old method of peeking around in `struct user' if the |
595 | GETREGS request isn't available. */ | |
596 | if (! have_ptrace_getregs) | |
597 | { | |
598 | old_fetch_inferior_registers (regno); | |
599 | return; | |
600 | } | |
601 | ||
a4b6fc86 | 602 | /* GNU/Linux LWP ID's are process ID's. */ |
39f77062 KB |
603 | if ((tid = TIDGET (inferior_ptid)) == 0) |
604 | tid = PIDGET (inferior_ptid); /* Not a threaded program. */ | |
ed9a39eb | 605 | |
6ce2ac0b | 606 | /* Use the PTRACE_GETFPXREGS request whenever possible, since it |
04cd15b6 | 607 | transfers more registers in one system call, and we'll cache the |
6ce2ac0b | 608 | results. But remember that fetch_fpxregs can fail, and return |
04cd15b6 | 609 | zero. */ |
5c44784c JM |
610 | if (regno == -1) |
611 | { | |
ed9a39eb | 612 | fetch_regs (tid); |
f60300e7 MK |
613 | |
614 | /* The call above might reset `have_ptrace_getregs'. */ | |
615 | if (! have_ptrace_getregs) | |
616 | { | |
617 | old_fetch_inferior_registers (-1); | |
618 | return; | |
619 | } | |
620 | ||
6ce2ac0b | 621 | if (fetch_fpxregs (tid)) |
5c44784c | 622 | return; |
ed9a39eb | 623 | fetch_fpregs (tid); |
5c44784c JM |
624 | return; |
625 | } | |
d4f3574e | 626 | |
5c44784c JM |
627 | if (GETREGS_SUPPLIES (regno)) |
628 | { | |
ed9a39eb | 629 | fetch_regs (tid); |
5c44784c JM |
630 | return; |
631 | } | |
632 | ||
6ce2ac0b | 633 | if (GETFPXREGS_SUPPLIES (regno)) |
5c44784c | 634 | { |
6ce2ac0b | 635 | if (fetch_fpxregs (tid)) |
5c44784c JM |
636 | return; |
637 | ||
638 | /* Either our processor or our kernel doesn't support the SSE | |
639 | registers, so read the FP registers in the traditional way, | |
640 | and fill the SSE registers with dummy values. It would be | |
641 | more graceful to handle differences in the register set using | |
642 | gdbarch. Until then, this will at least make things work | |
643 | plausibly. */ | |
ed9a39eb | 644 | fetch_fpregs (tid); |
5c44784c JM |
645 | return; |
646 | } | |
647 | ||
8e65ff28 AC |
648 | internal_error (__FILE__, __LINE__, |
649 | "Got request for bad register number %d.", regno); | |
d4f3574e SS |
650 | } |
651 | ||
04cd15b6 MK |
652 | /* Store register REGNO back into the child process. If REGNO is -1, |
653 | do this for all registers (including the floating point and SSE | |
654 | registers). */ | |
d4f3574e | 655 | void |
04cd15b6 | 656 | store_inferior_registers (int regno) |
d4f3574e | 657 | { |
ed9a39eb JM |
658 | int tid; |
659 | ||
f60300e7 MK |
660 | /* Use the old method of poking around in `struct user' if the |
661 | SETREGS request isn't available. */ | |
662 | if (! have_ptrace_getregs) | |
663 | { | |
664 | old_store_inferior_registers (regno); | |
665 | return; | |
666 | } | |
667 | ||
a4b6fc86 | 668 | /* GNU/Linux LWP ID's are process ID's. */ |
39f77062 KB |
669 | if ((tid = TIDGET (inferior_ptid)) == 0) |
670 | tid = PIDGET (inferior_ptid); /* Not a threaded program. */ | |
ed9a39eb | 671 | |
6ce2ac0b | 672 | /* Use the PTRACE_SETFPXREGS requests whenever possible, since it |
04cd15b6 | 673 | transfers more registers in one system call. But remember that |
6ce2ac0b | 674 | store_fpxregs can fail, and return zero. */ |
5c44784c JM |
675 | if (regno == -1) |
676 | { | |
6ce2ac0b MK |
677 | store_regs (tid, regno); |
678 | if (store_fpxregs (tid, regno)) | |
5c44784c | 679 | return; |
6ce2ac0b | 680 | store_fpregs (tid, regno); |
5c44784c JM |
681 | return; |
682 | } | |
d4f3574e | 683 | |
5c44784c JM |
684 | if (GETREGS_SUPPLIES (regno)) |
685 | { | |
6ce2ac0b | 686 | store_regs (tid, regno); |
5c44784c JM |
687 | return; |
688 | } | |
689 | ||
6ce2ac0b | 690 | if (GETFPXREGS_SUPPLIES (regno)) |
5c44784c | 691 | { |
6ce2ac0b | 692 | if (store_fpxregs (tid, regno)) |
5c44784c JM |
693 | return; |
694 | ||
695 | /* Either our processor or our kernel doesn't support the SSE | |
04cd15b6 MK |
696 | registers, so just write the FP registers in the traditional |
697 | way. */ | |
6ce2ac0b | 698 | store_fpregs (tid, regno); |
5c44784c JM |
699 | return; |
700 | } | |
701 | ||
8e65ff28 AC |
702 | internal_error (__FILE__, __LINE__, |
703 | "Got request to store bad register number %d.", regno); | |
d4f3574e | 704 | } |
de57eccd | 705 | \f |
6ce2ac0b | 706 | |
7bf0983e | 707 | static unsigned long |
84346e11 MK |
708 | i386_linux_dr_get (int regnum) |
709 | { | |
710 | int tid; | |
7bf0983e | 711 | unsigned long value; |
84346e11 MK |
712 | |
713 | /* FIXME: kettenis/2001-01-29: It's not clear what we should do with | |
714 | multi-threaded processes here. For now, pretend there is just | |
715 | one thread. */ | |
39f77062 | 716 | tid = PIDGET (inferior_ptid); |
84346e11 | 717 | |
b9511b9a MK |
718 | /* FIXME: kettenis/2001-03-27: Calling perror_with_name if the |
719 | ptrace call fails breaks debugging remote targets. The correct | |
720 | way to fix this is to add the hardware breakpoint and watchpoint | |
721 | stuff to the target vectore. For now, just return zero if the | |
722 | ptrace call fails. */ | |
84346e11 MK |
723 | errno = 0; |
724 | value = ptrace (PT_READ_U, tid, | |
725 | offsetof (struct user, u_debugreg[regnum]), 0); | |
726 | if (errno != 0) | |
b9511b9a | 727 | #if 0 |
84346e11 | 728 | perror_with_name ("Couldn't read debug register"); |
b9511b9a MK |
729 | #else |
730 | return 0; | |
731 | #endif | |
84346e11 MK |
732 | |
733 | return value; | |
734 | } | |
735 | ||
736 | static void | |
7bf0983e | 737 | i386_linux_dr_set (int regnum, unsigned long value) |
84346e11 MK |
738 | { |
739 | int tid; | |
740 | ||
741 | /* FIXME: kettenis/2001-01-29: It's not clear what we should do with | |
742 | multi-threaded processes here. For now, pretend there is just | |
743 | one thread. */ | |
39f77062 | 744 | tid = PIDGET (inferior_ptid); |
84346e11 MK |
745 | |
746 | errno = 0; | |
747 | ptrace (PT_WRITE_U, tid, | |
748 | offsetof (struct user, u_debugreg[regnum]), value); | |
749 | if (errno != 0) | |
750 | perror_with_name ("Couldn't write debug register"); | |
751 | } | |
752 | ||
753 | void | |
7bf0983e | 754 | i386_linux_dr_set_control (unsigned long control) |
84346e11 MK |
755 | { |
756 | i386_linux_dr_set (DR_CONTROL, control); | |
757 | } | |
758 | ||
759 | void | |
760 | i386_linux_dr_set_addr (int regnum, CORE_ADDR addr) | |
761 | { | |
762 | gdb_assert (regnum >= 0 && regnum <= DR_LASTADDR - DR_FIRSTADDR); | |
763 | ||
764 | i386_linux_dr_set (DR_FIRSTADDR + regnum, addr); | |
765 | } | |
766 | ||
767 | void | |
768 | i386_linux_dr_reset_addr (int regnum) | |
769 | { | |
770 | gdb_assert (regnum >= 0 && regnum <= DR_LASTADDR - DR_FIRSTADDR); | |
771 | ||
772 | i386_linux_dr_set (DR_FIRSTADDR + regnum, 0L); | |
773 | } | |
774 | ||
7bf0983e | 775 | unsigned long |
84346e11 MK |
776 | i386_linux_dr_get_status (void) |
777 | { | |
778 | return i386_linux_dr_get (DR_STATUS); | |
779 | } | |
780 | \f | |
781 | ||
de57eccd JM |
782 | /* Interpreting register set info found in core files. */ |
783 | ||
784 | /* Provide registers to GDB from a core file. | |
785 | ||
786 | (We can't use the generic version of this function in | |
a4b6fc86 | 787 | core-regset.c, because GNU/Linux has *three* different kinds of |
de57eccd | 788 | register set notes. core-regset.c would have to call |
6ce2ac0b | 789 | supply_fpxregset, which most platforms don't have.) |
de57eccd JM |
790 | |
791 | CORE_REG_SECT points to an array of bytes, which are the contents | |
792 | of a `note' from a core file which BFD thinks might contain | |
793 | register contents. CORE_REG_SIZE is its size. | |
794 | ||
795 | WHICH says which register set corelow suspects this is: | |
04cd15b6 MK |
796 | 0 --- the general-purpose register set, in elf_gregset_t format |
797 | 2 --- the floating-point register set, in elf_fpregset_t format | |
6ce2ac0b | 798 | 3 --- the extended floating-point register set, in elf_fpxregset_t format |
04cd15b6 | 799 | |
a4b6fc86 | 800 | REG_ADDR isn't used on GNU/Linux. */ |
de57eccd | 801 | |
de57eccd | 802 | static void |
04cd15b6 MK |
803 | fetch_core_registers (char *core_reg_sect, unsigned core_reg_size, |
804 | int which, CORE_ADDR reg_addr) | |
de57eccd | 805 | { |
04cd15b6 MK |
806 | elf_gregset_t gregset; |
807 | elf_fpregset_t fpregset; | |
de57eccd JM |
808 | |
809 | switch (which) | |
810 | { | |
811 | case 0: | |
812 | if (core_reg_size != sizeof (gregset)) | |
04cd15b6 | 813 | warning ("Wrong size gregset in core file."); |
de57eccd JM |
814 | else |
815 | { | |
816 | memcpy (&gregset, core_reg_sect, sizeof (gregset)); | |
817 | supply_gregset (&gregset); | |
818 | } | |
819 | break; | |
820 | ||
821 | case 2: | |
822 | if (core_reg_size != sizeof (fpregset)) | |
04cd15b6 | 823 | warning ("Wrong size fpregset in core file."); |
de57eccd JM |
824 | else |
825 | { | |
826 | memcpy (&fpregset, core_reg_sect, sizeof (fpregset)); | |
827 | supply_fpregset (&fpregset); | |
828 | } | |
829 | break; | |
830 | ||
6ce2ac0b | 831 | #ifdef HAVE_PTRACE_GETFPXREGS |
de57eccd | 832 | { |
6ce2ac0b | 833 | elf_fpxregset_t fpxregset; |
04cd15b6 | 834 | |
de57eccd | 835 | case 3: |
6ce2ac0b MK |
836 | if (core_reg_size != sizeof (fpxregset)) |
837 | warning ("Wrong size fpxregset in core file."); | |
de57eccd JM |
838 | else |
839 | { | |
6ce2ac0b MK |
840 | memcpy (&fpxregset, core_reg_sect, sizeof (fpxregset)); |
841 | supply_fpxregset (&fpxregset); | |
de57eccd JM |
842 | } |
843 | break; | |
844 | } | |
845 | #endif | |
846 | ||
847 | default: | |
848 | /* We've covered all the kinds of registers we know about here, | |
849 | so this must be something we wouldn't know what to do with | |
850 | anyway. Just ignore it. */ | |
851 | break; | |
852 | } | |
853 | } | |
a6abb2c0 | 854 | \f |
6ce2ac0b | 855 | |
a4b6fc86 | 856 | /* The instruction for a GNU/Linux system call is: |
a6abb2c0 MK |
857 | int $0x80 |
858 | or 0xcd 0x80. */ | |
859 | ||
860 | static const unsigned char linux_syscall[] = { 0xcd, 0x80 }; | |
861 | ||
862 | #define LINUX_SYSCALL_LEN (sizeof linux_syscall) | |
863 | ||
864 | /* The system call number is stored in the %eax register. */ | |
865 | #define LINUX_SYSCALL_REGNUM 0 /* %eax */ | |
866 | ||
867 | /* We are specifically interested in the sigreturn and rt_sigreturn | |
868 | system calls. */ | |
869 | ||
870 | #ifndef SYS_sigreturn | |
871 | #define SYS_sigreturn 0x77 | |
872 | #endif | |
873 | #ifndef SYS_rt_sigreturn | |
874 | #define SYS_rt_sigreturn 0xad | |
875 | #endif | |
876 | ||
877 | /* Offset to saved processor flags, from <asm/sigcontext.h>. */ | |
878 | #define LINUX_SIGCONTEXT_EFLAGS_OFFSET (64) | |
879 | ||
880 | /* Resume execution of the inferior process. | |
881 | If STEP is nonzero, single-step it. | |
882 | If SIGNAL is nonzero, give it that signal. */ | |
883 | ||
884 | void | |
39f77062 | 885 | child_resume (ptid_t ptid, int step, enum target_signal signal) |
a6abb2c0 | 886 | { |
39f77062 KB |
887 | int pid = PIDGET (ptid); |
888 | ||
a6abb2c0 MK |
889 | int request = PTRACE_CONT; |
890 | ||
891 | if (pid == -1) | |
892 | /* Resume all threads. */ | |
893 | /* I think this only gets used in the non-threaded case, where "resume | |
39f77062 KB |
894 | all threads" and "resume inferior_ptid" are the same. */ |
895 | pid = PIDGET (inferior_ptid); | |
a6abb2c0 MK |
896 | |
897 | if (step) | |
898 | { | |
39f77062 | 899 | CORE_ADDR pc = read_pc_pid (pid_to_ptid (pid)); |
a6abb2c0 MK |
900 | unsigned char buf[LINUX_SYSCALL_LEN]; |
901 | ||
902 | request = PTRACE_SINGLESTEP; | |
903 | ||
904 | /* Returning from a signal trampoline is done by calling a | |
905 | special system call (sigreturn or rt_sigreturn, see | |
906 | i386-linux-tdep.c for more information). This system call | |
907 | restores the registers that were saved when the signal was | |
908 | raised, including %eflags. That means that single-stepping | |
909 | won't work. Instead, we'll have to modify the signal context | |
910 | that's about to be restored, and set the trace flag there. */ | |
911 | ||
912 | /* First check if PC is at a system call. */ | |
913 | if (read_memory_nobpt (pc, (char *) buf, LINUX_SYSCALL_LEN) == 0 | |
914 | && memcmp (buf, linux_syscall, LINUX_SYSCALL_LEN) == 0) | |
915 | { | |
39f77062 KB |
916 | int syscall = read_register_pid (LINUX_SYSCALL_REGNUM, |
917 | pid_to_ptid (pid)); | |
a6abb2c0 MK |
918 | |
919 | /* Then check the system call number. */ | |
920 | if (syscall == SYS_sigreturn || syscall == SYS_rt_sigreturn) | |
921 | { | |
922 | CORE_ADDR sp = read_register (SP_REGNUM); | |
923 | CORE_ADDR addr = sp; | |
924 | unsigned long int eflags; | |
7bf0983e | 925 | |
a6abb2c0 MK |
926 | if (syscall == SYS_rt_sigreturn) |
927 | addr = read_memory_integer (sp + 8, 4) + 20; | |
928 | ||
929 | /* Set the trace flag in the context that's about to be | |
930 | restored. */ | |
931 | addr += LINUX_SIGCONTEXT_EFLAGS_OFFSET; | |
932 | read_memory (addr, (char *) &eflags, 4); | |
933 | eflags |= 0x0100; | |
934 | write_memory (addr, (char *) &eflags, 4); | |
935 | } | |
936 | } | |
937 | } | |
938 | ||
939 | if (ptrace (request, pid, 0, target_signal_to_host (signal)) == -1) | |
940 | perror_with_name ("ptrace"); | |
941 | } | |
5c44784c | 942 | \f |
6ce2ac0b | 943 | |
a4b6fc86 AC |
944 | /* Register that we are able to handle GNU/Linux ELF core file |
945 | formats. */ | |
04cd15b6 MK |
946 | |
947 | static struct core_fns linux_elf_core_fns = | |
948 | { | |
949 | bfd_target_elf_flavour, /* core_flavour */ | |
950 | default_check_format, /* check_format */ | |
951 | default_core_sniffer, /* core_sniffer */ | |
952 | fetch_core_registers, /* core_read_registers */ | |
953 | NULL /* next */ | |
954 | }; | |
de57eccd JM |
955 | |
956 | void | |
fba45db2 | 957 | _initialize_i386_linux_nat (void) |
de57eccd | 958 | { |
04cd15b6 | 959 | add_core_fns (&linux_elf_core_fns); |
de57eccd | 960 | } |