Commit | Line | Data |
---|---|---|
a4b6fc86 AC |
1 | /* Native-dependent code for GNU/Linux x86. |
2 | ||
975aec09 | 3 | Copyright 1999, 2000, 2001, 2002 Free Software Foundation, Inc. |
d4f3574e | 4 | |
04cd15b6 | 5 | This file is part of GDB. |
d4f3574e | 6 | |
04cd15b6 MK |
7 | This program is free software; you can redistribute it and/or modify |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 2 of the License, or | |
10 | (at your option) any later version. | |
d4f3574e | 11 | |
04cd15b6 MK |
12 | This program is distributed in the hope that it will be useful, |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
d4f3574e | 16 | |
04cd15b6 MK |
17 | You should have received a copy of the GNU General Public License |
18 | along with this program; if not, write to the Free Software | |
19 | Foundation, Inc., 59 Temple Place - Suite 330, | |
20 | Boston, MA 02111-1307, USA. */ | |
d4f3574e SS |
21 | |
22 | #include "defs.h" | |
23 | #include "inferior.h" | |
24 | #include "gdbcore.h" | |
4e052eda | 25 | #include "regcache.h" |
d4f3574e | 26 | |
84346e11 | 27 | #include "gdb_assert.h" |
309367d4 | 28 | #include "gdb_string.h" |
d4f3574e SS |
29 | #include <sys/ptrace.h> |
30 | #include <sys/user.h> | |
31 | #include <sys/procfs.h> | |
32 | ||
33 | #ifdef HAVE_SYS_REG_H | |
34 | #include <sys/reg.h> | |
35 | #endif | |
36 | ||
ce556f85 MK |
37 | #ifndef ORIG_EAX |
38 | #define ORIG_EAX -1 | |
39 | #endif | |
40 | ||
84346e11 MK |
41 | #ifdef HAVE_SYS_DEBUGREG_H |
42 | #include <sys/debugreg.h> | |
43 | #endif | |
44 | ||
45 | #ifndef DR_FIRSTADDR | |
46 | #define DR_FIRSTADDR 0 | |
47 | #endif | |
48 | ||
49 | #ifndef DR_LASTADDR | |
50 | #define DR_LASTADDR 3 | |
51 | #endif | |
52 | ||
53 | #ifndef DR_STATUS | |
54 | #define DR_STATUS 6 | |
55 | #endif | |
56 | ||
57 | #ifndef DR_CONTROL | |
58 | #define DR_CONTROL 7 | |
59 | #endif | |
60 | ||
6ce2ac0b | 61 | /* Prototypes for supply_gregset etc. */ |
c60c0f5f MS |
62 | #include "gregset.h" |
63 | ||
6ce2ac0b | 64 | /* Prototypes for i387_supply_fsave etc. */ |
e750d25e | 65 | #include "i387-tdep.h" |
6ce2ac0b | 66 | |
c3833324 MS |
67 | /* Defines for XMM0_REGNUM etc. */ |
68 | #include "i386-tdep.h" | |
69 | ||
5179e78f AC |
70 | /* Defines I386_LINUX_ORIG_EAX_REGNUM. */ |
71 | #include "i386-linux-tdep.h" | |
72 | ||
756ed206 MK |
73 | /* Prototypes for local functions. */ |
74 | static void dummy_sse_values (void); | |
6ce2ac0b | 75 | \f |
d4f3574e | 76 | |
a4b6fc86 AC |
77 | /* The register sets used in GNU/Linux ELF core-dumps are identical to |
78 | the register sets in `struct user' that is used for a.out | |
79 | core-dumps, and is also used by `ptrace'. The corresponding types | |
80 | are `elf_gregset_t' for the general-purpose registers (with | |
04cd15b6 MK |
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, | |
ce556f85 MK |
96 | DS, ES, FS, GS, |
97 | -1, -1, -1, -1, /* st0, st1, st2, st3 */ | |
98 | -1, -1, -1, -1, /* st4, st5, st6, st7 */ | |
99 | -1, -1, -1, -1, /* fctrl, fstat, ftag, fiseg */ | |
100 | -1, -1, -1, -1, /* fioff, foseg, fooff, fop */ | |
101 | -1, -1, -1, -1, /* xmm0, xmm1, xmm2, xmm3 */ | |
102 | -1, -1, -1, -1, /* xmm4, xmm5, xmm6, xmm6 */ | |
103 | -1, /* mxcsr */ | |
104 | ORIG_EAX | |
d4f3574e SS |
105 | }; |
106 | ||
5c44784c JM |
107 | /* Which ptrace request retrieves which registers? |
108 | These apply to the corresponding SET requests as well. */ | |
e64a344c | 109 | |
5c44784c | 110 | #define GETREGS_SUPPLIES(regno) \ |
3fb1c838 | 111 | ((0 <= (regno) && (regno) <= 15) || (regno) == I386_LINUX_ORIG_EAX_REGNUM) |
e64a344c | 112 | |
5c44784c JM |
113 | #define GETFPREGS_SUPPLIES(regno) \ |
114 | (FP0_REGNUM <= (regno) && (regno) <= LAST_FPU_CTRL_REGNUM) | |
e64a344c | 115 | |
6ce2ac0b | 116 | #define GETFPXREGS_SUPPLIES(regno) \ |
5c44784c JM |
117 | (FP0_REGNUM <= (regno) && (regno) <= MXCSR_REGNUM) |
118 | ||
f60300e7 MK |
119 | /* Does the current host support the GETREGS request? */ |
120 | int have_ptrace_getregs = | |
121 | #ifdef HAVE_PTRACE_GETREGS | |
122 | 1 | |
123 | #else | |
124 | 0 | |
125 | #endif | |
126 | ; | |
127 | ||
6ce2ac0b | 128 | /* Does the current host support the GETFPXREGS request? The header |
5c44784c JM |
129 | file may or may not define it, and even if it is defined, the |
130 | kernel will return EIO if it's running on a pre-SSE processor. | |
131 | ||
132 | My instinct is to attach this to some architecture- or | |
133 | target-specific data structure, but really, a particular GDB | |
134 | process can only run on top of one kernel at a time. So it's okay | |
135 | for this to be a simple variable. */ | |
6ce2ac0b MK |
136 | int have_ptrace_getfpxregs = |
137 | #ifdef HAVE_PTRACE_GETFPXREGS | |
5c44784c JM |
138 | 1 |
139 | #else | |
140 | 0 | |
141 | #endif | |
142 | ; | |
f60300e7 | 143 | \f |
6ce2ac0b | 144 | |
84346e11 MK |
145 | /* Support for the user struct. */ |
146 | ||
147 | /* Return the address of register REGNUM. BLOCKEND is the value of | |
148 | u.u_ar0, which should point to the registers. */ | |
149 | ||
150 | CORE_ADDR | |
151 | register_u_addr (CORE_ADDR blockend, int regnum) | |
152 | { | |
153 | return (blockend + 4 * regmap[regnum]); | |
154 | } | |
155 | ||
156 | /* Return the size of the user struct. */ | |
157 | ||
158 | int | |
159 | kernel_u_size (void) | |
160 | { | |
161 | return (sizeof (struct user)); | |
162 | } | |
163 | \f | |
164 | ||
ce556f85 | 165 | /* Accessing registers through the U area, one at a time. */ |
f60300e7 MK |
166 | |
167 | /* Fetch one register. */ | |
168 | ||
169 | static void | |
fba45db2 | 170 | fetch_register (int regno) |
f60300e7 | 171 | { |
f60300e7 | 172 | int tid; |
ce556f85 | 173 | int val; |
f60300e7 | 174 | |
ce556f85 MK |
175 | gdb_assert (!have_ptrace_getregs); |
176 | if (cannot_fetch_register (regno)) | |
f60300e7 | 177 | { |
ce556f85 | 178 | supply_register (regno, NULL); |
f60300e7 MK |
179 | return; |
180 | } | |
181 | ||
ce556f85 | 182 | /* GNU/Linux LWP ID's are process ID's. */ |
e64a344c MK |
183 | tid = TIDGET (inferior_ptid); |
184 | if (tid == 0) | |
185 | tid = PIDGET (inferior_ptid); /* Not a threaded program. */ | |
f60300e7 | 186 | |
ce556f85 MK |
187 | errno = 0; |
188 | val = ptrace (PTRACE_PEEKUSER, tid, register_addr (regno, 0), 0); | |
189 | if (errno != 0) | |
190 | error ("Couldn't read register %s (#%d): %s.", REGISTER_NAME (regno), | |
191 | regno, safe_strerror (errno)); | |
f60300e7 | 192 | |
ce556f85 | 193 | supply_register (regno, &val); |
f60300e7 MK |
194 | } |
195 | ||
f60300e7 MK |
196 | /* Store one register. */ |
197 | ||
198 | static void | |
fba45db2 | 199 | store_register (int regno) |
f60300e7 | 200 | { |
f60300e7 | 201 | int tid; |
ce556f85 | 202 | int val; |
f60300e7 | 203 | |
ce556f85 MK |
204 | gdb_assert (!have_ptrace_getregs); |
205 | if (cannot_store_register (regno)) | |
206 | return; | |
f60300e7 | 207 | |
ce556f85 | 208 | /* GNU/Linux LWP ID's are process ID's. */ |
e64a344c MK |
209 | tid = TIDGET (inferior_ptid); |
210 | if (tid == 0) | |
211 | tid = PIDGET (inferior_ptid); /* Not a threaded program. */ | |
f60300e7 | 212 | |
ce556f85 MK |
213 | errno = 0; |
214 | regcache_collect (regno, &val); | |
215 | ptrace (PTRACE_POKEUSER, tid, register_addr (regno, 0), val); | |
216 | if (errno != 0) | |
e64a344c | 217 | error ("Couldn't write register %s (#%d): %s.", REGISTER_NAME (regno), |
ce556f85 | 218 | regno, safe_strerror (errno)); |
f60300e7 | 219 | } |
5c44784c | 220 | \f |
6ce2ac0b | 221 | |
04cd15b6 MK |
222 | /* Transfering the general-purpose registers between GDB, inferiors |
223 | and core files. */ | |
224 | ||
ad2a4d09 | 225 | /* Fill GDB's register array with the general-purpose register values |
04cd15b6 | 226 | in *GREGSETP. */ |
5c44784c | 227 | |
d4f3574e | 228 | void |
04cd15b6 | 229 | supply_gregset (elf_gregset_t *gregsetp) |
d4f3574e | 230 | { |
04cd15b6 | 231 | elf_greg_t *regp = (elf_greg_t *) gregsetp; |
6ce2ac0b | 232 | int i; |
d4f3574e | 233 | |
98df6387 | 234 | for (i = 0; i < I386_NUM_GREGS; i++) |
14b08c1b | 235 | supply_register (i, regp + regmap[i]); |
3fb1c838 | 236 | |
82ea117a | 237 | if (I386_LINUX_ORIG_EAX_REGNUM < NUM_REGS) |
14b08c1b | 238 | supply_register (I386_LINUX_ORIG_EAX_REGNUM, regp + ORIG_EAX); |
917317f4 JM |
239 | } |
240 | ||
04cd15b6 MK |
241 | /* Fill register REGNO (if it is a general-purpose register) in |
242 | *GREGSETPS with the value in GDB's register array. If REGNO is -1, | |
243 | do this for all registers. */ | |
6ce2ac0b | 244 | |
917317f4 | 245 | void |
04cd15b6 | 246 | fill_gregset (elf_gregset_t *gregsetp, int regno) |
917317f4 | 247 | { |
6ce2ac0b MK |
248 | elf_greg_t *regp = (elf_greg_t *) gregsetp; |
249 | int i; | |
04cd15b6 | 250 | |
98df6387 | 251 | for (i = 0; i < I386_NUM_GREGS; i++) |
099a9414 | 252 | if (regno == -1 || regno == i) |
8a406745 | 253 | regcache_collect (i, regp + regmap[i]); |
3fb1c838 | 254 | |
82ea117a MK |
255 | if ((regno == -1 || regno == I386_LINUX_ORIG_EAX_REGNUM) |
256 | && I386_LINUX_ORIG_EAX_REGNUM < NUM_REGS) | |
76fb44f4 | 257 | regcache_collect (I386_LINUX_ORIG_EAX_REGNUM, regp + ORIG_EAX); |
d4f3574e SS |
258 | } |
259 | ||
f60300e7 MK |
260 | #ifdef HAVE_PTRACE_GETREGS |
261 | ||
04cd15b6 MK |
262 | /* Fetch all general-purpose registers from process/thread TID and |
263 | store their values in GDB's register array. */ | |
d4f3574e | 264 | |
5c44784c | 265 | static void |
ed9a39eb | 266 | fetch_regs (int tid) |
5c44784c | 267 | { |
04cd15b6 | 268 | elf_gregset_t regs; |
5c44784c | 269 | |
6ce2ac0b | 270 | if (ptrace (PTRACE_GETREGS, tid, 0, (int) ®s) < 0) |
5c44784c | 271 | { |
f60300e7 MK |
272 | if (errno == EIO) |
273 | { | |
274 | /* The kernel we're running on doesn't support the GETREGS | |
275 | request. Reset `have_ptrace_getregs'. */ | |
276 | have_ptrace_getregs = 0; | |
277 | return; | |
278 | } | |
279 | ||
6ce2ac0b | 280 | perror_with_name ("Couldn't get registers"); |
5c44784c JM |
281 | } |
282 | ||
04cd15b6 | 283 | supply_gregset (®s); |
5c44784c JM |
284 | } |
285 | ||
04cd15b6 MK |
286 | /* Store all valid general-purpose registers in GDB's register array |
287 | into the process/thread specified by TID. */ | |
5c44784c | 288 | |
5c44784c | 289 | static void |
6ce2ac0b | 290 | store_regs (int tid, int regno) |
5c44784c | 291 | { |
04cd15b6 | 292 | elf_gregset_t regs; |
5c44784c | 293 | |
6ce2ac0b MK |
294 | if (ptrace (PTRACE_GETREGS, tid, 0, (int) ®s) < 0) |
295 | perror_with_name ("Couldn't get registers"); | |
5c44784c | 296 | |
6ce2ac0b MK |
297 | fill_gregset (®s, regno); |
298 | ||
299 | if (ptrace (PTRACE_SETREGS, tid, 0, (int) ®s) < 0) | |
300 | perror_with_name ("Couldn't write registers"); | |
5c44784c JM |
301 | } |
302 | ||
f60300e7 MK |
303 | #else |
304 | ||
305 | static void fetch_regs (int tid) {} | |
6ce2ac0b | 306 | static void store_regs (int tid, int regno) {} |
f60300e7 MK |
307 | |
308 | #endif | |
5c44784c | 309 | \f |
5c44784c | 310 | |
6ce2ac0b | 311 | /* Transfering floating-point registers between GDB, inferiors and cores. */ |
d4f3574e | 312 | |
04cd15b6 | 313 | /* Fill GDB's register array with the floating-point register values in |
917317f4 | 314 | *FPREGSETP. */ |
04cd15b6 | 315 | |
d4f3574e | 316 | void |
04cd15b6 | 317 | supply_fpregset (elf_fpregset_t *fpregsetp) |
d4f3574e | 318 | { |
6ce2ac0b | 319 | i387_supply_fsave ((char *) fpregsetp); |
756ed206 | 320 | dummy_sse_values (); |
917317f4 | 321 | } |
d4f3574e | 322 | |
04cd15b6 MK |
323 | /* Fill register REGNO (if it is a floating-point register) in |
324 | *FPREGSETP with the value in GDB's register array. If REGNO is -1, | |
325 | do this for all registers. */ | |
917317f4 JM |
326 | |
327 | void | |
04cd15b6 | 328 | fill_fpregset (elf_fpregset_t *fpregsetp, int regno) |
917317f4 | 329 | { |
6ce2ac0b | 330 | i387_fill_fsave ((char *) fpregsetp, regno); |
d4f3574e SS |
331 | } |
332 | ||
f60300e7 MK |
333 | #ifdef HAVE_PTRACE_GETREGS |
334 | ||
04cd15b6 MK |
335 | /* Fetch all floating-point registers from process/thread TID and store |
336 | thier values in GDB's register array. */ | |
917317f4 | 337 | |
d4f3574e | 338 | static void |
ed9a39eb | 339 | fetch_fpregs (int tid) |
d4f3574e | 340 | { |
04cd15b6 | 341 | elf_fpregset_t fpregs; |
d4f3574e | 342 | |
6ce2ac0b MK |
343 | if (ptrace (PTRACE_GETFPREGS, tid, 0, (int) &fpregs) < 0) |
344 | perror_with_name ("Couldn't get floating point status"); | |
d4f3574e | 345 | |
04cd15b6 | 346 | supply_fpregset (&fpregs); |
d4f3574e SS |
347 | } |
348 | ||
04cd15b6 MK |
349 | /* Store all valid floating-point registers in GDB's register array |
350 | into the process/thread specified by TID. */ | |
d4f3574e | 351 | |
d4f3574e | 352 | static void |
6ce2ac0b | 353 | store_fpregs (int tid, int regno) |
d4f3574e | 354 | { |
04cd15b6 | 355 | elf_fpregset_t fpregs; |
d4f3574e | 356 | |
6ce2ac0b MK |
357 | if (ptrace (PTRACE_GETFPREGS, tid, 0, (int) &fpregs) < 0) |
358 | perror_with_name ("Couldn't get floating point status"); | |
d4f3574e | 359 | |
6ce2ac0b | 360 | fill_fpregset (&fpregs, regno); |
d4f3574e | 361 | |
6ce2ac0b MK |
362 | if (ptrace (PTRACE_SETFPREGS, tid, 0, (int) &fpregs) < 0) |
363 | perror_with_name ("Couldn't write floating point status"); | |
d4f3574e SS |
364 | } |
365 | ||
f60300e7 MK |
366 | #else |
367 | ||
368 | static void fetch_fpregs (int tid) {} | |
6ce2ac0b | 369 | static void store_fpregs (int tid, int regno) {} |
f60300e7 MK |
370 | |
371 | #endif | |
5c44784c | 372 | \f |
d4f3574e | 373 | |
6ce2ac0b | 374 | /* Transfering floating-point and SSE registers to and from GDB. */ |
11cf8741 | 375 | |
6ce2ac0b | 376 | #ifdef HAVE_PTRACE_GETFPXREGS |
04cd15b6 MK |
377 | |
378 | /* Fill GDB's register array with the floating-point and SSE register | |
6ce2ac0b | 379 | values in *FPXREGSETP. */ |
04cd15b6 | 380 | |
975aec09 | 381 | void |
6ce2ac0b | 382 | supply_fpxregset (elf_fpxregset_t *fpxregsetp) |
d4f3574e | 383 | { |
6ce2ac0b | 384 | i387_supply_fxsave ((char *) fpxregsetp); |
d4f3574e SS |
385 | } |
386 | ||
6ce2ac0b MK |
387 | /* Fill register REGNO (if it is a floating-point or SSE register) in |
388 | *FPXREGSETP with the value in GDB's register array. If REGNO is | |
389 | -1, do this for all registers. */ | |
d4f3574e | 390 | |
975aec09 | 391 | void |
6ce2ac0b | 392 | fill_fpxregset (elf_fpxregset_t *fpxregsetp, int regno) |
d4f3574e | 393 | { |
6ce2ac0b | 394 | i387_fill_fxsave ((char *) fpxregsetp, regno); |
5c44784c JM |
395 | } |
396 | ||
6ce2ac0b | 397 | /* Fetch all registers covered by the PTRACE_GETFPXREGS request from |
04cd15b6 MK |
398 | process/thread TID and store their values in GDB's register array. |
399 | Return non-zero if successful, zero otherwise. */ | |
5c44784c | 400 | |
5c44784c | 401 | static int |
6ce2ac0b | 402 | fetch_fpxregs (int tid) |
5c44784c | 403 | { |
6ce2ac0b | 404 | elf_fpxregset_t fpxregs; |
5c44784c | 405 | |
6ce2ac0b | 406 | if (! have_ptrace_getfpxregs) |
5c44784c JM |
407 | return 0; |
408 | ||
6ce2ac0b | 409 | if (ptrace (PTRACE_GETFPXREGS, tid, 0, (int) &fpxregs) < 0) |
d4f3574e | 410 | { |
5c44784c JM |
411 | if (errno == EIO) |
412 | { | |
6ce2ac0b | 413 | have_ptrace_getfpxregs = 0; |
5c44784c JM |
414 | return 0; |
415 | } | |
416 | ||
6ce2ac0b | 417 | perror_with_name ("Couldn't read floating-point and SSE registers"); |
d4f3574e SS |
418 | } |
419 | ||
6ce2ac0b | 420 | supply_fpxregset (&fpxregs); |
5c44784c JM |
421 | return 1; |
422 | } | |
d4f3574e | 423 | |
04cd15b6 | 424 | /* Store all valid registers in GDB's register array covered by the |
6ce2ac0b | 425 | PTRACE_SETFPXREGS request into the process/thread specified by TID. |
04cd15b6 | 426 | Return non-zero if successful, zero otherwise. */ |
5c44784c | 427 | |
5c44784c | 428 | static int |
6ce2ac0b | 429 | store_fpxregs (int tid, int regno) |
5c44784c | 430 | { |
6ce2ac0b | 431 | elf_fpxregset_t fpxregs; |
5c44784c | 432 | |
6ce2ac0b | 433 | if (! have_ptrace_getfpxregs) |
5c44784c | 434 | return 0; |
6ce2ac0b MK |
435 | |
436 | if (ptrace (PTRACE_GETFPXREGS, tid, 0, &fpxregs) == -1) | |
2866d305 MK |
437 | { |
438 | if (errno == EIO) | |
439 | { | |
440 | have_ptrace_getfpxregs = 0; | |
441 | return 0; | |
442 | } | |
443 | ||
444 | perror_with_name ("Couldn't read floating-point and SSE registers"); | |
445 | } | |
5c44784c | 446 | |
6ce2ac0b | 447 | fill_fpxregset (&fpxregs, regno); |
5c44784c | 448 | |
6ce2ac0b MK |
449 | if (ptrace (PTRACE_SETFPXREGS, tid, 0, &fpxregs) == -1) |
450 | perror_with_name ("Couldn't write floating-point and SSE registers"); | |
5c44784c JM |
451 | |
452 | return 1; | |
453 | } | |
454 | ||
04cd15b6 | 455 | /* Fill the XMM registers in the register array with dummy values. For |
5c44784c JM |
456 | cases where we don't have access to the XMM registers. I think |
457 | this is cleaner than printing a warning. For a cleaner solution, | |
458 | we should gdbarchify the i386 family. */ | |
04cd15b6 | 459 | |
5c44784c | 460 | static void |
04cd15b6 | 461 | dummy_sse_values (void) |
5c44784c | 462 | { |
7010ca0a | 463 | struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); |
5c44784c JM |
464 | /* C doesn't have a syntax for NaN's, so write it out as an array of |
465 | longs. */ | |
466 | static long dummy[4] = { 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff }; | |
467 | static long mxcsr = 0x1f80; | |
468 | int reg; | |
469 | ||
7010ca0a | 470 | for (reg = 0; reg < tdep->num_xmm_regs; reg++) |
5c44784c | 471 | supply_register (XMM0_REGNUM + reg, (char *) dummy); |
7010ca0a MK |
472 | if (tdep->num_xmm_regs > 0) |
473 | supply_register (MXCSR_REGNUM, (char *) &mxcsr); | |
d4f3574e SS |
474 | } |
475 | ||
5c44784c JM |
476 | #else |
477 | ||
f0373401 MK |
478 | static int fetch_fpxregs (int tid) { return 0; } |
479 | static int store_fpxregs (int tid, int regno) { return 0; } | |
04cd15b6 | 480 | static void dummy_sse_values (void) {} |
5c44784c | 481 | |
6ce2ac0b | 482 | #endif /* HAVE_PTRACE_GETFPXREGS */ |
5c44784c | 483 | \f |
6ce2ac0b | 484 | |
5c44784c | 485 | /* Transferring arbitrary registers between GDB and inferior. */ |
d4f3574e | 486 | |
d5d65353 PS |
487 | /* Check if register REGNO in the child process is accessible. |
488 | If we are accessing registers directly via the U area, only the | |
489 | general-purpose registers are available. | |
490 | All registers should be accessible if we have GETREGS support. */ | |
491 | ||
492 | int | |
493 | cannot_fetch_register (int regno) | |
494 | { | |
ce556f85 MK |
495 | gdb_assert (regno >= 0 && regno < NUM_REGS); |
496 | return (!have_ptrace_getregs && regmap[regno] == -1); | |
d5d65353 | 497 | } |
ce556f85 | 498 | |
d5d65353 PS |
499 | int |
500 | cannot_store_register (int regno) | |
501 | { | |
ce556f85 MK |
502 | gdb_assert (regno >= 0 && regno < NUM_REGS); |
503 | return (!have_ptrace_getregs && regmap[regno] == -1); | |
d5d65353 PS |
504 | } |
505 | ||
04cd15b6 MK |
506 | /* Fetch register REGNO from the child process. If REGNO is -1, do |
507 | this for all registers (including the floating point and SSE | |
508 | registers). */ | |
d4f3574e SS |
509 | |
510 | void | |
917317f4 | 511 | fetch_inferior_registers (int regno) |
d4f3574e | 512 | { |
ed9a39eb JM |
513 | int tid; |
514 | ||
f60300e7 MK |
515 | /* Use the old method of peeking around in `struct user' if the |
516 | GETREGS request isn't available. */ | |
ce556f85 | 517 | if (!have_ptrace_getregs) |
f60300e7 | 518 | { |
ce556f85 MK |
519 | int i; |
520 | ||
521 | for (i = 0; i < NUM_REGS; i++) | |
522 | if (regno == -1 || regno == i) | |
523 | fetch_register (i); | |
524 | ||
f60300e7 MK |
525 | return; |
526 | } | |
527 | ||
a4b6fc86 | 528 | /* GNU/Linux LWP ID's are process ID's. */ |
e64a344c MK |
529 | tid = TIDGET (inferior_ptid); |
530 | if (tid == 0) | |
531 | tid = PIDGET (inferior_ptid); /* Not a threaded program. */ | |
ed9a39eb | 532 | |
6ce2ac0b | 533 | /* Use the PTRACE_GETFPXREGS request whenever possible, since it |
04cd15b6 | 534 | transfers more registers in one system call, and we'll cache the |
6ce2ac0b | 535 | results. But remember that fetch_fpxregs can fail, and return |
04cd15b6 | 536 | zero. */ |
5c44784c JM |
537 | if (regno == -1) |
538 | { | |
ed9a39eb | 539 | fetch_regs (tid); |
f60300e7 MK |
540 | |
541 | /* The call above might reset `have_ptrace_getregs'. */ | |
ce556f85 | 542 | if (!have_ptrace_getregs) |
f60300e7 | 543 | { |
ce556f85 | 544 | fetch_inferior_registers (regno); |
f60300e7 MK |
545 | return; |
546 | } | |
547 | ||
6ce2ac0b | 548 | if (fetch_fpxregs (tid)) |
5c44784c | 549 | return; |
ed9a39eb | 550 | fetch_fpregs (tid); |
5c44784c JM |
551 | return; |
552 | } | |
d4f3574e | 553 | |
5c44784c JM |
554 | if (GETREGS_SUPPLIES (regno)) |
555 | { | |
ed9a39eb | 556 | fetch_regs (tid); |
5c44784c JM |
557 | return; |
558 | } | |
559 | ||
6ce2ac0b | 560 | if (GETFPXREGS_SUPPLIES (regno)) |
5c44784c | 561 | { |
6ce2ac0b | 562 | if (fetch_fpxregs (tid)) |
5c44784c JM |
563 | return; |
564 | ||
565 | /* Either our processor or our kernel doesn't support the SSE | |
566 | registers, so read the FP registers in the traditional way, | |
567 | and fill the SSE registers with dummy values. It would be | |
568 | more graceful to handle differences in the register set using | |
569 | gdbarch. Until then, this will at least make things work | |
570 | plausibly. */ | |
ed9a39eb | 571 | fetch_fpregs (tid); |
5c44784c JM |
572 | return; |
573 | } | |
574 | ||
8e65ff28 AC |
575 | internal_error (__FILE__, __LINE__, |
576 | "Got request for bad register number %d.", regno); | |
d4f3574e SS |
577 | } |
578 | ||
04cd15b6 MK |
579 | /* Store register REGNO back into the child process. If REGNO is -1, |
580 | do this for all registers (including the floating point and SSE | |
581 | registers). */ | |
d4f3574e | 582 | void |
04cd15b6 | 583 | store_inferior_registers (int regno) |
d4f3574e | 584 | { |
ed9a39eb JM |
585 | int tid; |
586 | ||
f60300e7 MK |
587 | /* Use the old method of poking around in `struct user' if the |
588 | SETREGS request isn't available. */ | |
ce556f85 | 589 | if (!have_ptrace_getregs) |
f60300e7 | 590 | { |
ce556f85 MK |
591 | int i; |
592 | ||
593 | for (i = 0; i < NUM_REGS; i++) | |
594 | if (regno == -1 || regno == i) | |
595 | store_register (i); | |
596 | ||
f60300e7 MK |
597 | return; |
598 | } | |
599 | ||
a4b6fc86 | 600 | /* GNU/Linux LWP ID's are process ID's. */ |
e64a344c MK |
601 | tid = TIDGET (inferior_ptid); |
602 | if (tid == 0) | |
603 | tid = PIDGET (inferior_ptid); /* Not a threaded program. */ | |
ed9a39eb | 604 | |
6ce2ac0b | 605 | /* Use the PTRACE_SETFPXREGS requests whenever possible, since it |
04cd15b6 | 606 | transfers more registers in one system call. But remember that |
6ce2ac0b | 607 | store_fpxregs can fail, and return zero. */ |
5c44784c JM |
608 | if (regno == -1) |
609 | { | |
6ce2ac0b MK |
610 | store_regs (tid, regno); |
611 | if (store_fpxregs (tid, regno)) | |
5c44784c | 612 | return; |
6ce2ac0b | 613 | store_fpregs (tid, regno); |
5c44784c JM |
614 | return; |
615 | } | |
d4f3574e | 616 | |
5c44784c JM |
617 | if (GETREGS_SUPPLIES (regno)) |
618 | { | |
6ce2ac0b | 619 | store_regs (tid, regno); |
5c44784c JM |
620 | return; |
621 | } | |
622 | ||
6ce2ac0b | 623 | if (GETFPXREGS_SUPPLIES (regno)) |
5c44784c | 624 | { |
6ce2ac0b | 625 | if (store_fpxregs (tid, regno)) |
5c44784c JM |
626 | return; |
627 | ||
628 | /* Either our processor or our kernel doesn't support the SSE | |
04cd15b6 MK |
629 | registers, so just write the FP registers in the traditional |
630 | way. */ | |
6ce2ac0b | 631 | store_fpregs (tid, regno); |
5c44784c JM |
632 | return; |
633 | } | |
634 | ||
8e65ff28 AC |
635 | internal_error (__FILE__, __LINE__, |
636 | "Got request to store bad register number %d.", regno); | |
d4f3574e | 637 | } |
de57eccd | 638 | \f |
6ce2ac0b | 639 | |
7bf0983e | 640 | static unsigned long |
84346e11 MK |
641 | i386_linux_dr_get (int regnum) |
642 | { | |
643 | int tid; | |
7bf0983e | 644 | unsigned long value; |
84346e11 MK |
645 | |
646 | /* FIXME: kettenis/2001-01-29: It's not clear what we should do with | |
647 | multi-threaded processes here. For now, pretend there is just | |
648 | one thread. */ | |
39f77062 | 649 | tid = PIDGET (inferior_ptid); |
84346e11 | 650 | |
b9511b9a MK |
651 | /* FIXME: kettenis/2001-03-27: Calling perror_with_name if the |
652 | ptrace call fails breaks debugging remote targets. The correct | |
653 | way to fix this is to add the hardware breakpoint and watchpoint | |
654 | stuff to the target vectore. For now, just return zero if the | |
655 | ptrace call fails. */ | |
84346e11 | 656 | errno = 0; |
ce556f85 | 657 | value = ptrace (PTRACE_PEEKUSER, tid, |
84346e11 MK |
658 | offsetof (struct user, u_debugreg[regnum]), 0); |
659 | if (errno != 0) | |
b9511b9a | 660 | #if 0 |
84346e11 | 661 | perror_with_name ("Couldn't read debug register"); |
b9511b9a MK |
662 | #else |
663 | return 0; | |
664 | #endif | |
84346e11 MK |
665 | |
666 | return value; | |
667 | } | |
668 | ||
669 | static void | |
7bf0983e | 670 | i386_linux_dr_set (int regnum, unsigned long value) |
84346e11 MK |
671 | { |
672 | int tid; | |
673 | ||
674 | /* FIXME: kettenis/2001-01-29: It's not clear what we should do with | |
675 | multi-threaded processes here. For now, pretend there is just | |
676 | one thread. */ | |
39f77062 | 677 | tid = PIDGET (inferior_ptid); |
84346e11 MK |
678 | |
679 | errno = 0; | |
ce556f85 | 680 | ptrace (PTRACE_POKEUSER, tid, |
84346e11 MK |
681 | offsetof (struct user, u_debugreg[regnum]), value); |
682 | if (errno != 0) | |
683 | perror_with_name ("Couldn't write debug register"); | |
684 | } | |
685 | ||
686 | void | |
7bf0983e | 687 | i386_linux_dr_set_control (unsigned long control) |
84346e11 MK |
688 | { |
689 | i386_linux_dr_set (DR_CONTROL, control); | |
690 | } | |
691 | ||
692 | void | |
693 | i386_linux_dr_set_addr (int regnum, CORE_ADDR addr) | |
694 | { | |
695 | gdb_assert (regnum >= 0 && regnum <= DR_LASTADDR - DR_FIRSTADDR); | |
696 | ||
697 | i386_linux_dr_set (DR_FIRSTADDR + regnum, addr); | |
698 | } | |
699 | ||
700 | void | |
701 | i386_linux_dr_reset_addr (int regnum) | |
702 | { | |
703 | gdb_assert (regnum >= 0 && regnum <= DR_LASTADDR - DR_FIRSTADDR); | |
704 | ||
705 | i386_linux_dr_set (DR_FIRSTADDR + regnum, 0L); | |
706 | } | |
707 | ||
7bf0983e | 708 | unsigned long |
84346e11 MK |
709 | i386_linux_dr_get_status (void) |
710 | { | |
711 | return i386_linux_dr_get (DR_STATUS); | |
712 | } | |
713 | \f | |
714 | ||
de57eccd JM |
715 | /* Interpreting register set info found in core files. */ |
716 | ||
717 | /* Provide registers to GDB from a core file. | |
718 | ||
719 | (We can't use the generic version of this function in | |
a4b6fc86 | 720 | core-regset.c, because GNU/Linux has *three* different kinds of |
de57eccd | 721 | register set notes. core-regset.c would have to call |
6ce2ac0b | 722 | supply_fpxregset, which most platforms don't have.) |
de57eccd JM |
723 | |
724 | CORE_REG_SECT points to an array of bytes, which are the contents | |
725 | of a `note' from a core file which BFD thinks might contain | |
726 | register contents. CORE_REG_SIZE is its size. | |
727 | ||
728 | WHICH says which register set corelow suspects this is: | |
04cd15b6 MK |
729 | 0 --- the general-purpose register set, in elf_gregset_t format |
730 | 2 --- the floating-point register set, in elf_fpregset_t format | |
6ce2ac0b | 731 | 3 --- the extended floating-point register set, in elf_fpxregset_t format |
04cd15b6 | 732 | |
a4b6fc86 | 733 | REG_ADDR isn't used on GNU/Linux. */ |
de57eccd | 734 | |
de57eccd | 735 | static void |
04cd15b6 MK |
736 | fetch_core_registers (char *core_reg_sect, unsigned core_reg_size, |
737 | int which, CORE_ADDR reg_addr) | |
de57eccd | 738 | { |
04cd15b6 MK |
739 | elf_gregset_t gregset; |
740 | elf_fpregset_t fpregset; | |
de57eccd JM |
741 | |
742 | switch (which) | |
743 | { | |
744 | case 0: | |
745 | if (core_reg_size != sizeof (gregset)) | |
04cd15b6 | 746 | warning ("Wrong size gregset in core file."); |
de57eccd JM |
747 | else |
748 | { | |
749 | memcpy (&gregset, core_reg_sect, sizeof (gregset)); | |
750 | supply_gregset (&gregset); | |
751 | } | |
752 | break; | |
753 | ||
754 | case 2: | |
755 | if (core_reg_size != sizeof (fpregset)) | |
04cd15b6 | 756 | warning ("Wrong size fpregset in core file."); |
de57eccd JM |
757 | else |
758 | { | |
759 | memcpy (&fpregset, core_reg_sect, sizeof (fpregset)); | |
760 | supply_fpregset (&fpregset); | |
761 | } | |
762 | break; | |
763 | ||
6ce2ac0b | 764 | #ifdef HAVE_PTRACE_GETFPXREGS |
de57eccd | 765 | { |
6ce2ac0b | 766 | elf_fpxregset_t fpxregset; |
04cd15b6 | 767 | |
de57eccd | 768 | case 3: |
6ce2ac0b MK |
769 | if (core_reg_size != sizeof (fpxregset)) |
770 | warning ("Wrong size fpxregset in core file."); | |
de57eccd JM |
771 | else |
772 | { | |
6ce2ac0b MK |
773 | memcpy (&fpxregset, core_reg_sect, sizeof (fpxregset)); |
774 | supply_fpxregset (&fpxregset); | |
de57eccd JM |
775 | } |
776 | break; | |
777 | } | |
778 | #endif | |
779 | ||
780 | default: | |
781 | /* We've covered all the kinds of registers we know about here, | |
782 | so this must be something we wouldn't know what to do with | |
783 | anyway. Just ignore it. */ | |
784 | break; | |
785 | } | |
786 | } | |
a6abb2c0 | 787 | \f |
6ce2ac0b | 788 | |
a4b6fc86 | 789 | /* The instruction for a GNU/Linux system call is: |
a6abb2c0 MK |
790 | int $0x80 |
791 | or 0xcd 0x80. */ | |
792 | ||
793 | static const unsigned char linux_syscall[] = { 0xcd, 0x80 }; | |
794 | ||
795 | #define LINUX_SYSCALL_LEN (sizeof linux_syscall) | |
796 | ||
797 | /* The system call number is stored in the %eax register. */ | |
798 | #define LINUX_SYSCALL_REGNUM 0 /* %eax */ | |
799 | ||
800 | /* We are specifically interested in the sigreturn and rt_sigreturn | |
801 | system calls. */ | |
802 | ||
803 | #ifndef SYS_sigreturn | |
804 | #define SYS_sigreturn 0x77 | |
805 | #endif | |
806 | #ifndef SYS_rt_sigreturn | |
807 | #define SYS_rt_sigreturn 0xad | |
808 | #endif | |
809 | ||
810 | /* Offset to saved processor flags, from <asm/sigcontext.h>. */ | |
811 | #define LINUX_SIGCONTEXT_EFLAGS_OFFSET (64) | |
812 | ||
813 | /* Resume execution of the inferior process. | |
814 | If STEP is nonzero, single-step it. | |
815 | If SIGNAL is nonzero, give it that signal. */ | |
816 | ||
817 | void | |
39f77062 | 818 | child_resume (ptid_t ptid, int step, enum target_signal signal) |
a6abb2c0 | 819 | { |
39f77062 KB |
820 | int pid = PIDGET (ptid); |
821 | ||
a6abb2c0 MK |
822 | int request = PTRACE_CONT; |
823 | ||
824 | if (pid == -1) | |
825 | /* Resume all threads. */ | |
826 | /* I think this only gets used in the non-threaded case, where "resume | |
39f77062 KB |
827 | all threads" and "resume inferior_ptid" are the same. */ |
828 | pid = PIDGET (inferior_ptid); | |
a6abb2c0 MK |
829 | |
830 | if (step) | |
831 | { | |
39f77062 | 832 | CORE_ADDR pc = read_pc_pid (pid_to_ptid (pid)); |
a6abb2c0 MK |
833 | unsigned char buf[LINUX_SYSCALL_LEN]; |
834 | ||
835 | request = PTRACE_SINGLESTEP; | |
836 | ||
837 | /* Returning from a signal trampoline is done by calling a | |
838 | special system call (sigreturn or rt_sigreturn, see | |
839 | i386-linux-tdep.c for more information). This system call | |
840 | restores the registers that were saved when the signal was | |
841 | raised, including %eflags. That means that single-stepping | |
842 | won't work. Instead, we'll have to modify the signal context | |
843 | that's about to be restored, and set the trace flag there. */ | |
844 | ||
845 | /* First check if PC is at a system call. */ | |
846 | if (read_memory_nobpt (pc, (char *) buf, LINUX_SYSCALL_LEN) == 0 | |
847 | && memcmp (buf, linux_syscall, LINUX_SYSCALL_LEN) == 0) | |
848 | { | |
39f77062 KB |
849 | int syscall = read_register_pid (LINUX_SYSCALL_REGNUM, |
850 | pid_to_ptid (pid)); | |
a6abb2c0 MK |
851 | |
852 | /* Then check the system call number. */ | |
853 | if (syscall == SYS_sigreturn || syscall == SYS_rt_sigreturn) | |
854 | { | |
855 | CORE_ADDR sp = read_register (SP_REGNUM); | |
856 | CORE_ADDR addr = sp; | |
857 | unsigned long int eflags; | |
7bf0983e | 858 | |
a6abb2c0 MK |
859 | if (syscall == SYS_rt_sigreturn) |
860 | addr = read_memory_integer (sp + 8, 4) + 20; | |
861 | ||
862 | /* Set the trace flag in the context that's about to be | |
863 | restored. */ | |
864 | addr += LINUX_SIGCONTEXT_EFLAGS_OFFSET; | |
865 | read_memory (addr, (char *) &eflags, 4); | |
866 | eflags |= 0x0100; | |
867 | write_memory (addr, (char *) &eflags, 4); | |
868 | } | |
869 | } | |
870 | } | |
871 | ||
872 | if (ptrace (request, pid, 0, target_signal_to_host (signal)) == -1) | |
873 | perror_with_name ("ptrace"); | |
874 | } | |
5c44784c | 875 | \f |
6ce2ac0b | 876 | |
a4b6fc86 AC |
877 | /* Register that we are able to handle GNU/Linux ELF core file |
878 | formats. */ | |
04cd15b6 MK |
879 | |
880 | static struct core_fns linux_elf_core_fns = | |
881 | { | |
882 | bfd_target_elf_flavour, /* core_flavour */ | |
883 | default_check_format, /* check_format */ | |
884 | default_core_sniffer, /* core_sniffer */ | |
885 | fetch_core_registers, /* core_read_registers */ | |
886 | NULL /* next */ | |
887 | }; | |
de57eccd JM |
888 | |
889 | void | |
fba45db2 | 890 | _initialize_i386_linux_nat (void) |
de57eccd | 891 | { |
04cd15b6 | 892 | add_core_fns (&linux_elf_core_fns); |
de57eccd | 893 | } |