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