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