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