Commit | Line | Data |
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a4194092 | 1 | /* Native-dependent code for GNU/Linux i386. |
a4b6fc86 | 2 | |
6aba47ca | 3 | Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007 |
31828840 | 4 | Free Software Foundation, Inc. |
d4f3574e | 5 | |
04cd15b6 | 6 | This file is part of GDB. |
d4f3574e | 7 | |
04cd15b6 MK |
8 | This program is free software; you can redistribute it and/or modify |
9 | it under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 2 of the License, or | |
11 | (at your option) any later version. | |
d4f3574e | 12 | |
04cd15b6 MK |
13 | This program is distributed in the hope that it will be useful, |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
d4f3574e | 17 | |
04cd15b6 MK |
18 | You should have received a copy of the GNU General Public License |
19 | along with this program; if not, write to the Free Software | |
197e01b6 EZ |
20 | Foundation, Inc., 51 Franklin Street, Fifth Floor, |
21 | Boston, MA 02110-1301, USA. */ | |
d4f3574e SS |
22 | |
23 | #include "defs.h" | |
24 | #include "inferior.h" | |
25 | #include "gdbcore.h" | |
4e052eda | 26 | #include "regcache.h" |
10d6c8cd | 27 | #include "target.h" |
4de4c07c | 28 | #include "linux-nat.h" |
d4f3574e | 29 | |
84346e11 | 30 | #include "gdb_assert.h" |
309367d4 | 31 | #include "gdb_string.h" |
d4f3574e SS |
32 | #include <sys/ptrace.h> |
33 | #include <sys/user.h> | |
34 | #include <sys/procfs.h> | |
35 | ||
36 | #ifdef HAVE_SYS_REG_H | |
37 | #include <sys/reg.h> | |
38 | #endif | |
39 | ||
ce556f85 MK |
40 | #ifndef ORIG_EAX |
41 | #define ORIG_EAX -1 | |
42 | #endif | |
43 | ||
84346e11 MK |
44 | #ifdef HAVE_SYS_DEBUGREG_H |
45 | #include <sys/debugreg.h> | |
46 | #endif | |
47 | ||
48 | #ifndef DR_FIRSTADDR | |
49 | #define DR_FIRSTADDR 0 | |
50 | #endif | |
51 | ||
52 | #ifndef DR_LASTADDR | |
53 | #define DR_LASTADDR 3 | |
54 | #endif | |
55 | ||
56 | #ifndef DR_STATUS | |
57 | #define DR_STATUS 6 | |
58 | #endif | |
59 | ||
60 | #ifndef DR_CONTROL | |
61 | #define DR_CONTROL 7 | |
62 | #endif | |
63 | ||
6ce2ac0b | 64 | /* Prototypes for supply_gregset etc. */ |
c60c0f5f MS |
65 | #include "gregset.h" |
66 | ||
e750d25e | 67 | #include "i387-tdep.h" |
c3833324 | 68 | #include "i386-tdep.h" |
5179e78f AC |
69 | #include "i386-linux-tdep.h" |
70 | ||
b757528f JJ |
71 | /* Defines ps_err_e, struct ps_prochandle. */ |
72 | #include "gdb_proc_service.h" | |
6ce2ac0b | 73 | \f |
d4f3574e | 74 | |
a4b6fc86 AC |
75 | /* The register sets used in GNU/Linux ELF core-dumps are identical to |
76 | the register sets in `struct user' that is used for a.out | |
77 | core-dumps, and is also used by `ptrace'. The corresponding types | |
78 | are `elf_gregset_t' for the general-purpose registers (with | |
04cd15b6 MK |
79 | `elf_greg_t' the type of a single GP register) and `elf_fpregset_t' |
80 | for the floating-point registers. | |
81 | ||
82 | Those types used to be available under the names `gregset_t' and | |
83 | `fpregset_t' too, and this file used those names in the past. But | |
84 | those names are now used for the register sets used in the | |
85 | `mcontext_t' type, and have a different size and layout. */ | |
86 | ||
87 | /* Mapping between the general-purpose registers in `struct user' | |
88 | format and GDB's register array layout. */ | |
d4f3574e SS |
89 | static int regmap[] = |
90 | { | |
91 | EAX, ECX, EDX, EBX, | |
92 | UESP, EBP, ESI, EDI, | |
93 | EIP, EFL, CS, SS, | |
ce556f85 MK |
94 | DS, ES, FS, GS, |
95 | -1, -1, -1, -1, /* st0, st1, st2, st3 */ | |
96 | -1, -1, -1, -1, /* st4, st5, st6, st7 */ | |
97 | -1, -1, -1, -1, /* fctrl, fstat, ftag, fiseg */ | |
98 | -1, -1, -1, -1, /* fioff, foseg, fooff, fop */ | |
99 | -1, -1, -1, -1, /* xmm0, xmm1, xmm2, xmm3 */ | |
100 | -1, -1, -1, -1, /* xmm4, xmm5, xmm6, xmm6 */ | |
101 | -1, /* mxcsr */ | |
102 | ORIG_EAX | |
d4f3574e SS |
103 | }; |
104 | ||
5c44784c JM |
105 | /* Which ptrace request retrieves which registers? |
106 | These apply to the corresponding SET requests as well. */ | |
e64a344c | 107 | |
5c44784c | 108 | #define GETREGS_SUPPLIES(regno) \ |
3fb1c838 | 109 | ((0 <= (regno) && (regno) <= 15) || (regno) == I386_LINUX_ORIG_EAX_REGNUM) |
e64a344c | 110 | |
6ce2ac0b | 111 | #define GETFPXREGS_SUPPLIES(regno) \ |
f6792ef4 | 112 | (I386_ST0_REGNUM <= (regno) && (regno) < I386_SSE_NUM_REGS) |
5c44784c | 113 | |
f60300e7 MK |
114 | /* Does the current host support the GETREGS request? */ |
115 | int have_ptrace_getregs = | |
116 | #ifdef HAVE_PTRACE_GETREGS | |
117 | 1 | |
118 | #else | |
119 | 0 | |
120 | #endif | |
121 | ; | |
122 | ||
6ce2ac0b | 123 | /* Does the current host support the GETFPXREGS request? The header |
5c44784c JM |
124 | file may or may not define it, and even if it is defined, the |
125 | kernel will return EIO if it's running on a pre-SSE processor. | |
126 | ||
127 | My instinct is to attach this to some architecture- or | |
128 | target-specific data structure, but really, a particular GDB | |
129 | process can only run on top of one kernel at a time. So it's okay | |
130 | for this to be a simple variable. */ | |
6ce2ac0b MK |
131 | int have_ptrace_getfpxregs = |
132 | #ifdef HAVE_PTRACE_GETFPXREGS | |
5c44784c JM |
133 | 1 |
134 | #else | |
135 | 0 | |
136 | #endif | |
137 | ; | |
f60300e7 | 138 | \f |
6ce2ac0b | 139 | |
ce556f85 | 140 | /* Accessing registers through the U area, one at a time. */ |
f60300e7 MK |
141 | |
142 | /* Fetch one register. */ | |
143 | ||
144 | static void | |
56be3814 | 145 | fetch_register (struct regcache *regcache, int regno) |
f60300e7 | 146 | { |
f60300e7 | 147 | int tid; |
ce556f85 | 148 | int val; |
f60300e7 | 149 | |
ce556f85 | 150 | gdb_assert (!have_ptrace_getregs); |
de732108 | 151 | if (regmap[regno] == -1) |
f60300e7 | 152 | { |
56be3814 | 153 | regcache_raw_supply (regcache, regno, NULL); |
f60300e7 MK |
154 | return; |
155 | } | |
156 | ||
ce556f85 | 157 | /* GNU/Linux LWP ID's are process ID's. */ |
e64a344c MK |
158 | tid = TIDGET (inferior_ptid); |
159 | if (tid == 0) | |
160 | tid = PIDGET (inferior_ptid); /* Not a threaded program. */ | |
f60300e7 | 161 | |
ce556f85 | 162 | errno = 0; |
de732108 | 163 | val = ptrace (PTRACE_PEEKUSER, tid, 4 * regmap[regno], 0); |
ce556f85 | 164 | if (errno != 0) |
c9f4d572 UW |
165 | error (_("Couldn't read register %s (#%d): %s."), |
166 | gdbarch_register_name (current_gdbarch, regno), | |
ce556f85 | 167 | regno, safe_strerror (errno)); |
f60300e7 | 168 | |
56be3814 | 169 | regcache_raw_supply (regcache, regno, &val); |
f60300e7 MK |
170 | } |
171 | ||
f60300e7 MK |
172 | /* Store one register. */ |
173 | ||
174 | static void | |
56be3814 | 175 | store_register (const struct regcache *regcache, int regno) |
f60300e7 | 176 | { |
f60300e7 | 177 | int tid; |
ce556f85 | 178 | int val; |
f60300e7 | 179 | |
ce556f85 | 180 | gdb_assert (!have_ptrace_getregs); |
de732108 | 181 | if (regmap[regno] == -1) |
ce556f85 | 182 | return; |
f60300e7 | 183 | |
ce556f85 | 184 | /* GNU/Linux LWP ID's are process ID's. */ |
e64a344c MK |
185 | tid = TIDGET (inferior_ptid); |
186 | if (tid == 0) | |
187 | tid = PIDGET (inferior_ptid); /* Not a threaded program. */ | |
f60300e7 | 188 | |
ce556f85 | 189 | errno = 0; |
56be3814 | 190 | regcache_raw_collect (regcache, regno, &val); |
de732108 | 191 | ptrace (PTRACE_POKEUSER, tid, 4 * regmap[regno], val); |
ce556f85 | 192 | if (errno != 0) |
c9f4d572 UW |
193 | error (_("Couldn't write register %s (#%d): %s."), |
194 | gdbarch_register_name (current_gdbarch, regno), | |
ce556f85 | 195 | regno, safe_strerror (errno)); |
f60300e7 | 196 | } |
5c44784c | 197 | \f |
6ce2ac0b | 198 | |
04cd15b6 MK |
199 | /* Transfering the general-purpose registers between GDB, inferiors |
200 | and core files. */ | |
201 | ||
ad2a4d09 | 202 | /* Fill GDB's register array with the general-purpose register values |
04cd15b6 | 203 | in *GREGSETP. */ |
5c44784c | 204 | |
d4f3574e | 205 | void |
7f7fe91e | 206 | supply_gregset (struct regcache *regcache, const elf_gregset_t *gregsetp) |
d4f3574e | 207 | { |
7f7fe91e | 208 | const elf_greg_t *regp = (const elf_greg_t *) gregsetp; |
6ce2ac0b | 209 | int i; |
d4f3574e | 210 | |
98df6387 | 211 | for (i = 0; i < I386_NUM_GREGS; i++) |
7f7fe91e | 212 | regcache_raw_supply (regcache, i, regp + regmap[i]); |
3fb1c838 | 213 | |
f57d151a | 214 | if (I386_LINUX_ORIG_EAX_REGNUM < gdbarch_num_regs (current_gdbarch)) |
7f7fe91e | 215 | regcache_raw_supply (regcache, I386_LINUX_ORIG_EAX_REGNUM, |
31828840 | 216 | regp + ORIG_EAX); |
917317f4 JM |
217 | } |
218 | ||
04cd15b6 MK |
219 | /* Fill register REGNO (if it is a general-purpose register) in |
220 | *GREGSETPS with the value in GDB's register array. If REGNO is -1, | |
221 | do this for all registers. */ | |
6ce2ac0b | 222 | |
917317f4 | 223 | void |
7f7fe91e UW |
224 | fill_gregset (const struct regcache *regcache, |
225 | elf_gregset_t *gregsetp, int regno) | |
917317f4 | 226 | { |
6ce2ac0b MK |
227 | elf_greg_t *regp = (elf_greg_t *) gregsetp; |
228 | int i; | |
04cd15b6 | 229 | |
98df6387 | 230 | for (i = 0; i < I386_NUM_GREGS; i++) |
099a9414 | 231 | if (regno == -1 || regno == i) |
7f7fe91e | 232 | regcache_raw_collect (regcache, i, regp + regmap[i]); |
3fb1c838 | 233 | |
82ea117a | 234 | if ((regno == -1 || regno == I386_LINUX_ORIG_EAX_REGNUM) |
f57d151a | 235 | && I386_LINUX_ORIG_EAX_REGNUM < gdbarch_num_regs (current_gdbarch)) |
7f7fe91e | 236 | regcache_raw_collect (regcache, I386_LINUX_ORIG_EAX_REGNUM, |
31828840 | 237 | regp + ORIG_EAX); |
d4f3574e SS |
238 | } |
239 | ||
f60300e7 MK |
240 | #ifdef HAVE_PTRACE_GETREGS |
241 | ||
04cd15b6 MK |
242 | /* Fetch all general-purpose registers from process/thread TID and |
243 | store their values in GDB's register array. */ | |
d4f3574e | 244 | |
5c44784c | 245 | static void |
56be3814 | 246 | fetch_regs (struct regcache *regcache, int tid) |
5c44784c | 247 | { |
04cd15b6 | 248 | elf_gregset_t regs; |
5c44784c | 249 | |
6ce2ac0b | 250 | if (ptrace (PTRACE_GETREGS, tid, 0, (int) ®s) < 0) |
5c44784c | 251 | { |
f60300e7 MK |
252 | if (errno == EIO) |
253 | { | |
254 | /* The kernel we're running on doesn't support the GETREGS | |
255 | request. Reset `have_ptrace_getregs'. */ | |
256 | have_ptrace_getregs = 0; | |
257 | return; | |
258 | } | |
259 | ||
e2e0b3e5 | 260 | perror_with_name (_("Couldn't get registers")); |
5c44784c JM |
261 | } |
262 | ||
56be3814 | 263 | supply_gregset (regcache, (const elf_gregset_t *) ®s); |
5c44784c JM |
264 | } |
265 | ||
04cd15b6 MK |
266 | /* Store all valid general-purpose registers in GDB's register array |
267 | into the process/thread specified by TID. */ | |
5c44784c | 268 | |
5c44784c | 269 | static void |
56be3814 | 270 | store_regs (const struct regcache *regcache, int tid, int regno) |
5c44784c | 271 | { |
04cd15b6 | 272 | elf_gregset_t regs; |
5c44784c | 273 | |
6ce2ac0b | 274 | if (ptrace (PTRACE_GETREGS, tid, 0, (int) ®s) < 0) |
e2e0b3e5 | 275 | perror_with_name (_("Couldn't get registers")); |
5c44784c | 276 | |
56be3814 | 277 | fill_gregset (regcache, ®s, regno); |
6ce2ac0b MK |
278 | |
279 | if (ptrace (PTRACE_SETREGS, tid, 0, (int) ®s) < 0) | |
e2e0b3e5 | 280 | perror_with_name (_("Couldn't write registers")); |
5c44784c JM |
281 | } |
282 | ||
f60300e7 MK |
283 | #else |
284 | ||
56be3814 UW |
285 | static void fetch_regs (struct regcache *regcache, int tid) {} |
286 | static void store_regs (const struct regcache *regcache, int tid, int regno) {} | |
f60300e7 MK |
287 | |
288 | #endif | |
5c44784c | 289 | \f |
5c44784c | 290 | |
6ce2ac0b | 291 | /* Transfering floating-point registers between GDB, inferiors and cores. */ |
d4f3574e | 292 | |
04cd15b6 | 293 | /* Fill GDB's register array with the floating-point register values in |
917317f4 | 294 | *FPREGSETP. */ |
04cd15b6 | 295 | |
d4f3574e | 296 | void |
7f7fe91e | 297 | supply_fpregset (struct regcache *regcache, const elf_fpregset_t *fpregsetp) |
d4f3574e | 298 | { |
7f7fe91e | 299 | i387_supply_fsave (regcache, -1, fpregsetp); |
917317f4 | 300 | } |
d4f3574e | 301 | |
04cd15b6 MK |
302 | /* Fill register REGNO (if it is a floating-point register) in |
303 | *FPREGSETP with the value in GDB's register array. If REGNO is -1, | |
304 | do this for all registers. */ | |
917317f4 JM |
305 | |
306 | void | |
7f7fe91e UW |
307 | fill_fpregset (const struct regcache *regcache, |
308 | elf_fpregset_t *fpregsetp, int regno) | |
917317f4 | 309 | { |
7f7fe91e | 310 | i387_collect_fsave (regcache, regno, fpregsetp); |
d4f3574e SS |
311 | } |
312 | ||
f60300e7 MK |
313 | #ifdef HAVE_PTRACE_GETREGS |
314 | ||
04cd15b6 MK |
315 | /* Fetch all floating-point registers from process/thread TID and store |
316 | thier values in GDB's register array. */ | |
917317f4 | 317 | |
d4f3574e | 318 | static void |
56be3814 | 319 | fetch_fpregs (struct regcache *regcache, int tid) |
d4f3574e | 320 | { |
04cd15b6 | 321 | elf_fpregset_t fpregs; |
d4f3574e | 322 | |
6ce2ac0b | 323 | if (ptrace (PTRACE_GETFPREGS, tid, 0, (int) &fpregs) < 0) |
e2e0b3e5 | 324 | perror_with_name (_("Couldn't get floating point status")); |
d4f3574e | 325 | |
56be3814 | 326 | supply_fpregset (regcache, (const elf_fpregset_t *) &fpregs); |
d4f3574e SS |
327 | } |
328 | ||
04cd15b6 MK |
329 | /* Store all valid floating-point registers in GDB's register array |
330 | into the process/thread specified by TID. */ | |
d4f3574e | 331 | |
d4f3574e | 332 | static void |
56be3814 | 333 | store_fpregs (const struct regcache *regcache, int tid, int regno) |
d4f3574e | 334 | { |
04cd15b6 | 335 | elf_fpregset_t fpregs; |
d4f3574e | 336 | |
6ce2ac0b | 337 | if (ptrace (PTRACE_GETFPREGS, tid, 0, (int) &fpregs) < 0) |
e2e0b3e5 | 338 | perror_with_name (_("Couldn't get floating point status")); |
d4f3574e | 339 | |
56be3814 | 340 | fill_fpregset (regcache, &fpregs, regno); |
d4f3574e | 341 | |
6ce2ac0b | 342 | if (ptrace (PTRACE_SETFPREGS, tid, 0, (int) &fpregs) < 0) |
e2e0b3e5 | 343 | perror_with_name (_("Couldn't write floating point status")); |
d4f3574e SS |
344 | } |
345 | ||
f60300e7 MK |
346 | #else |
347 | ||
56be3814 UW |
348 | static void fetch_fpregs (struct regcache *regcache, int tid) {} |
349 | static void store_fpregs (const struct regcache *regcache, int tid, int regno) {} | |
f60300e7 MK |
350 | |
351 | #endif | |
5c44784c | 352 | \f |
d4f3574e | 353 | |
6ce2ac0b | 354 | /* Transfering floating-point and SSE registers to and from GDB. */ |
11cf8741 | 355 | |
6ce2ac0b | 356 | #ifdef HAVE_PTRACE_GETFPXREGS |
04cd15b6 MK |
357 | |
358 | /* Fill GDB's register array with the floating-point and SSE register | |
6ce2ac0b | 359 | values in *FPXREGSETP. */ |
04cd15b6 | 360 | |
975aec09 | 361 | void |
7f7fe91e UW |
362 | supply_fpxregset (struct regcache *regcache, |
363 | const elf_fpxregset_t *fpxregsetp) | |
d4f3574e | 364 | { |
7f7fe91e | 365 | i387_supply_fxsave (regcache, -1, fpxregsetp); |
d4f3574e SS |
366 | } |
367 | ||
6ce2ac0b MK |
368 | /* Fill register REGNO (if it is a floating-point or SSE register) in |
369 | *FPXREGSETP with the value in GDB's register array. If REGNO is | |
370 | -1, do this for all registers. */ | |
d4f3574e | 371 | |
975aec09 | 372 | void |
7f7fe91e UW |
373 | fill_fpxregset (const struct regcache *regcache, |
374 | elf_fpxregset_t *fpxregsetp, int regno) | |
d4f3574e | 375 | { |
7f7fe91e | 376 | i387_collect_fxsave (regcache, regno, fpxregsetp); |
5c44784c JM |
377 | } |
378 | ||
6ce2ac0b | 379 | /* Fetch all registers covered by the PTRACE_GETFPXREGS request from |
04cd15b6 MK |
380 | process/thread TID and store their values in GDB's register array. |
381 | Return non-zero if successful, zero otherwise. */ | |
5c44784c | 382 | |
5c44784c | 383 | static int |
56be3814 | 384 | fetch_fpxregs (struct regcache *regcache, int tid) |
5c44784c | 385 | { |
6ce2ac0b | 386 | elf_fpxregset_t fpxregs; |
5c44784c | 387 | |
6ce2ac0b | 388 | if (! have_ptrace_getfpxregs) |
5c44784c JM |
389 | return 0; |
390 | ||
6ce2ac0b | 391 | if (ptrace (PTRACE_GETFPXREGS, tid, 0, (int) &fpxregs) < 0) |
d4f3574e | 392 | { |
5c44784c JM |
393 | if (errno == EIO) |
394 | { | |
6ce2ac0b | 395 | have_ptrace_getfpxregs = 0; |
5c44784c JM |
396 | return 0; |
397 | } | |
398 | ||
e2e0b3e5 | 399 | perror_with_name (_("Couldn't read floating-point and SSE registers")); |
d4f3574e SS |
400 | } |
401 | ||
56be3814 | 402 | supply_fpxregset (regcache, (const elf_fpxregset_t *) &fpxregs); |
5c44784c JM |
403 | return 1; |
404 | } | |
d4f3574e | 405 | |
04cd15b6 | 406 | /* Store all valid registers in GDB's register array covered by the |
6ce2ac0b | 407 | PTRACE_SETFPXREGS request into the process/thread specified by TID. |
04cd15b6 | 408 | Return non-zero if successful, zero otherwise. */ |
5c44784c | 409 | |
5c44784c | 410 | static int |
56be3814 | 411 | store_fpxregs (const struct regcache *regcache, int tid, int regno) |
5c44784c | 412 | { |
6ce2ac0b | 413 | elf_fpxregset_t fpxregs; |
5c44784c | 414 | |
6ce2ac0b | 415 | if (! have_ptrace_getfpxregs) |
5c44784c | 416 | return 0; |
6ce2ac0b MK |
417 | |
418 | if (ptrace (PTRACE_GETFPXREGS, tid, 0, &fpxregs) == -1) | |
2866d305 MK |
419 | { |
420 | if (errno == EIO) | |
421 | { | |
422 | have_ptrace_getfpxregs = 0; | |
423 | return 0; | |
424 | } | |
425 | ||
e2e0b3e5 | 426 | perror_with_name (_("Couldn't read floating-point and SSE registers")); |
2866d305 | 427 | } |
5c44784c | 428 | |
56be3814 | 429 | fill_fpxregset (regcache, &fpxregs, regno); |
5c44784c | 430 | |
6ce2ac0b | 431 | if (ptrace (PTRACE_SETFPXREGS, tid, 0, &fpxregs) == -1) |
e2e0b3e5 | 432 | perror_with_name (_("Couldn't write floating-point and SSE registers")); |
5c44784c JM |
433 | |
434 | return 1; | |
435 | } | |
436 | ||
5c44784c JM |
437 | #else |
438 | ||
56be3814 UW |
439 | static int fetch_fpxregs (struct regcache *regcache, int tid) { return 0; } |
440 | static int store_fpxregs (const struct regcache *regcache, int tid, int regno) { return 0; } | |
5c44784c | 441 | |
6ce2ac0b | 442 | #endif /* HAVE_PTRACE_GETFPXREGS */ |
5c44784c | 443 | \f |
6ce2ac0b | 444 | |
5c44784c | 445 | /* Transferring arbitrary registers between GDB and inferior. */ |
d4f3574e | 446 | |
04cd15b6 MK |
447 | /* Fetch register REGNO from the child process. If REGNO is -1, do |
448 | this for all registers (including the floating point and SSE | |
449 | registers). */ | |
d4f3574e | 450 | |
10d6c8cd | 451 | static void |
56be3814 | 452 | i386_linux_fetch_inferior_registers (struct regcache *regcache, int regno) |
d4f3574e | 453 | { |
ed9a39eb JM |
454 | int tid; |
455 | ||
f60300e7 MK |
456 | /* Use the old method of peeking around in `struct user' if the |
457 | GETREGS request isn't available. */ | |
ce556f85 | 458 | if (!have_ptrace_getregs) |
f60300e7 | 459 | { |
ce556f85 MK |
460 | int i; |
461 | ||
f57d151a | 462 | for (i = 0; i < gdbarch_num_regs (current_gdbarch); i++) |
ce556f85 | 463 | if (regno == -1 || regno == i) |
56be3814 | 464 | fetch_register (regcache, i); |
ce556f85 | 465 | |
f60300e7 MK |
466 | return; |
467 | } | |
468 | ||
a4b6fc86 | 469 | /* GNU/Linux LWP ID's are process ID's. */ |
e64a344c MK |
470 | tid = TIDGET (inferior_ptid); |
471 | if (tid == 0) | |
472 | tid = PIDGET (inferior_ptid); /* Not a threaded program. */ | |
ed9a39eb | 473 | |
6ce2ac0b | 474 | /* Use the PTRACE_GETFPXREGS request whenever possible, since it |
04cd15b6 | 475 | transfers more registers in one system call, and we'll cache the |
6ce2ac0b | 476 | results. But remember that fetch_fpxregs can fail, and return |
04cd15b6 | 477 | zero. */ |
5c44784c JM |
478 | if (regno == -1) |
479 | { | |
56be3814 | 480 | fetch_regs (regcache, tid); |
f60300e7 MK |
481 | |
482 | /* The call above might reset `have_ptrace_getregs'. */ | |
ce556f85 | 483 | if (!have_ptrace_getregs) |
f60300e7 | 484 | { |
56be3814 | 485 | i386_linux_fetch_inferior_registers (regcache, regno); |
f60300e7 MK |
486 | return; |
487 | } | |
488 | ||
56be3814 | 489 | if (fetch_fpxregs (regcache, tid)) |
5c44784c | 490 | return; |
56be3814 | 491 | fetch_fpregs (regcache, tid); |
5c44784c JM |
492 | return; |
493 | } | |
d4f3574e | 494 | |
5c44784c JM |
495 | if (GETREGS_SUPPLIES (regno)) |
496 | { | |
56be3814 | 497 | fetch_regs (regcache, tid); |
5c44784c JM |
498 | return; |
499 | } | |
500 | ||
6ce2ac0b | 501 | if (GETFPXREGS_SUPPLIES (regno)) |
5c44784c | 502 | { |
56be3814 | 503 | if (fetch_fpxregs (regcache, tid)) |
5c44784c JM |
504 | return; |
505 | ||
506 | /* Either our processor or our kernel doesn't support the SSE | |
507 | registers, so read the FP registers in the traditional way, | |
508 | and fill the SSE registers with dummy values. It would be | |
509 | more graceful to handle differences in the register set using | |
510 | gdbarch. Until then, this will at least make things work | |
511 | plausibly. */ | |
56be3814 | 512 | fetch_fpregs (regcache, tid); |
5c44784c JM |
513 | return; |
514 | } | |
515 | ||
8e65ff28 | 516 | internal_error (__FILE__, __LINE__, |
e2e0b3e5 | 517 | _("Got request for bad register number %d."), regno); |
d4f3574e SS |
518 | } |
519 | ||
04cd15b6 MK |
520 | /* Store register REGNO back into the child process. If REGNO is -1, |
521 | do this for all registers (including the floating point and SSE | |
522 | registers). */ | |
10d6c8cd | 523 | static void |
56be3814 | 524 | i386_linux_store_inferior_registers (struct regcache *regcache, int regno) |
d4f3574e | 525 | { |
ed9a39eb JM |
526 | int tid; |
527 | ||
f60300e7 MK |
528 | /* Use the old method of poking around in `struct user' if the |
529 | SETREGS request isn't available. */ | |
ce556f85 | 530 | if (!have_ptrace_getregs) |
f60300e7 | 531 | { |
ce556f85 MK |
532 | int i; |
533 | ||
f57d151a | 534 | for (i = 0; i < gdbarch_num_regs (current_gdbarch); i++) |
ce556f85 | 535 | if (regno == -1 || regno == i) |
56be3814 | 536 | store_register (regcache, i); |
ce556f85 | 537 | |
f60300e7 MK |
538 | return; |
539 | } | |
540 | ||
a4b6fc86 | 541 | /* GNU/Linux LWP ID's are process ID's. */ |
e64a344c MK |
542 | tid = TIDGET (inferior_ptid); |
543 | if (tid == 0) | |
544 | tid = PIDGET (inferior_ptid); /* Not a threaded program. */ | |
ed9a39eb | 545 | |
6ce2ac0b | 546 | /* Use the PTRACE_SETFPXREGS requests whenever possible, since it |
04cd15b6 | 547 | transfers more registers in one system call. But remember that |
6ce2ac0b | 548 | store_fpxregs can fail, and return zero. */ |
5c44784c JM |
549 | if (regno == -1) |
550 | { | |
56be3814 UW |
551 | store_regs (regcache, tid, regno); |
552 | if (store_fpxregs (regcache, tid, regno)) | |
5c44784c | 553 | return; |
56be3814 | 554 | store_fpregs (regcache, tid, regno); |
5c44784c JM |
555 | return; |
556 | } | |
d4f3574e | 557 | |
5c44784c JM |
558 | if (GETREGS_SUPPLIES (regno)) |
559 | { | |
56be3814 | 560 | store_regs (regcache, tid, regno); |
5c44784c JM |
561 | return; |
562 | } | |
563 | ||
6ce2ac0b | 564 | if (GETFPXREGS_SUPPLIES (regno)) |
5c44784c | 565 | { |
56be3814 | 566 | if (store_fpxregs (regcache, tid, regno)) |
5c44784c JM |
567 | return; |
568 | ||
569 | /* Either our processor or our kernel doesn't support the SSE | |
04cd15b6 MK |
570 | registers, so just write the FP registers in the traditional |
571 | way. */ | |
56be3814 | 572 | store_fpregs (regcache, tid, regno); |
5c44784c JM |
573 | return; |
574 | } | |
575 | ||
8e65ff28 | 576 | internal_error (__FILE__, __LINE__, |
e2e0b3e5 | 577 | _("Got request to store bad register number %d."), regno); |
d4f3574e | 578 | } |
de57eccd | 579 | \f |
6ce2ac0b | 580 | |
4ffc8466 MK |
581 | /* Support for debug registers. */ |
582 | ||
7bf0983e | 583 | static unsigned long |
84346e11 MK |
584 | i386_linux_dr_get (int regnum) |
585 | { | |
586 | int tid; | |
7bf0983e | 587 | unsigned long value; |
84346e11 MK |
588 | |
589 | /* FIXME: kettenis/2001-01-29: It's not clear what we should do with | |
590 | multi-threaded processes here. For now, pretend there is just | |
591 | one thread. */ | |
39f77062 | 592 | tid = PIDGET (inferior_ptid); |
84346e11 | 593 | |
b9511b9a MK |
594 | /* FIXME: kettenis/2001-03-27: Calling perror_with_name if the |
595 | ptrace call fails breaks debugging remote targets. The correct | |
596 | way to fix this is to add the hardware breakpoint and watchpoint | |
7532965f | 597 | stuff to the target vector. For now, just return zero if the |
b9511b9a | 598 | ptrace call fails. */ |
84346e11 | 599 | errno = 0; |
ce556f85 | 600 | value = ptrace (PTRACE_PEEKUSER, tid, |
84346e11 MK |
601 | offsetof (struct user, u_debugreg[regnum]), 0); |
602 | if (errno != 0) | |
b9511b9a | 603 | #if 0 |
e2e0b3e5 | 604 | perror_with_name (_("Couldn't read debug register")); |
b9511b9a MK |
605 | #else |
606 | return 0; | |
607 | #endif | |
84346e11 MK |
608 | |
609 | return value; | |
610 | } | |
611 | ||
612 | static void | |
7bf0983e | 613 | i386_linux_dr_set (int regnum, unsigned long value) |
84346e11 MK |
614 | { |
615 | int tid; | |
616 | ||
617 | /* FIXME: kettenis/2001-01-29: It's not clear what we should do with | |
618 | multi-threaded processes here. For now, pretend there is just | |
619 | one thread. */ | |
39f77062 | 620 | tid = PIDGET (inferior_ptid); |
84346e11 MK |
621 | |
622 | errno = 0; | |
ce556f85 | 623 | ptrace (PTRACE_POKEUSER, tid, |
84346e11 MK |
624 | offsetof (struct user, u_debugreg[regnum]), value); |
625 | if (errno != 0) | |
e2e0b3e5 | 626 | perror_with_name (_("Couldn't write debug register")); |
84346e11 MK |
627 | } |
628 | ||
629 | void | |
7bf0983e | 630 | i386_linux_dr_set_control (unsigned long control) |
84346e11 MK |
631 | { |
632 | i386_linux_dr_set (DR_CONTROL, control); | |
633 | } | |
634 | ||
635 | void | |
636 | i386_linux_dr_set_addr (int regnum, CORE_ADDR addr) | |
637 | { | |
638 | gdb_assert (regnum >= 0 && regnum <= DR_LASTADDR - DR_FIRSTADDR); | |
639 | ||
640 | i386_linux_dr_set (DR_FIRSTADDR + regnum, addr); | |
641 | } | |
642 | ||
643 | void | |
644 | i386_linux_dr_reset_addr (int regnum) | |
645 | { | |
646 | gdb_assert (regnum >= 0 && regnum <= DR_LASTADDR - DR_FIRSTADDR); | |
647 | ||
648 | i386_linux_dr_set (DR_FIRSTADDR + regnum, 0L); | |
649 | } | |
650 | ||
7bf0983e | 651 | unsigned long |
84346e11 MK |
652 | i386_linux_dr_get_status (void) |
653 | { | |
654 | return i386_linux_dr_get (DR_STATUS); | |
655 | } | |
656 | \f | |
657 | ||
5bca7895 MK |
658 | /* Called by libthread_db. Returns a pointer to the thread local |
659 | storage (or its descriptor). */ | |
660 | ||
661 | ps_err_e | |
662 | ps_get_thread_area (const struct ps_prochandle *ph, | |
663 | lwpid_t lwpid, int idx, void **base) | |
664 | { | |
665 | /* NOTE: cagney/2003-08-26: The definition of this buffer is found | |
666 | in the kernel header <asm-i386/ldt.h>. It, after padding, is 4 x | |
667 | 4 byte integers in size: `entry_number', `base_addr', `limit', | |
668 | and a bunch of status bits. | |
669 | ||
670 | The values returned by this ptrace call should be part of the | |
671 | regcache buffer, and ps_get_thread_area should channel its | |
672 | request through the regcache. That way remote targets could | |
673 | provide the value using the remote protocol and not this direct | |
674 | call. | |
675 | ||
676 | Is this function needed? I'm guessing that the `base' is the | |
677 | address of a a descriptor that libthread_db uses to find the | |
b2fa5097 | 678 | thread local address base that GDB needs. Perhaps that |
5bca7895 MK |
679 | descriptor is defined by the ABI. Anyway, given that |
680 | libthread_db calls this function without prompting (gdb | |
681 | requesting tls base) I guess it needs info in there anyway. */ | |
682 | unsigned int desc[4]; | |
683 | gdb_assert (sizeof (int) == 4); | |
684 | ||
685 | #ifndef PTRACE_GET_THREAD_AREA | |
686 | #define PTRACE_GET_THREAD_AREA 25 | |
687 | #endif | |
688 | ||
689 | if (ptrace (PTRACE_GET_THREAD_AREA, lwpid, | |
690 | (void *) idx, (unsigned long) &desc) < 0) | |
691 | return PS_ERR; | |
692 | ||
693 | *(int *)base = desc[1]; | |
694 | return PS_OK; | |
695 | } | |
696 | \f | |
697 | ||
a4b6fc86 | 698 | /* The instruction for a GNU/Linux system call is: |
a6abb2c0 MK |
699 | int $0x80 |
700 | or 0xcd 0x80. */ | |
701 | ||
702 | static const unsigned char linux_syscall[] = { 0xcd, 0x80 }; | |
703 | ||
704 | #define LINUX_SYSCALL_LEN (sizeof linux_syscall) | |
705 | ||
706 | /* The system call number is stored in the %eax register. */ | |
7532965f | 707 | #define LINUX_SYSCALL_REGNUM I386_EAX_REGNUM |
a6abb2c0 MK |
708 | |
709 | /* We are specifically interested in the sigreturn and rt_sigreturn | |
710 | system calls. */ | |
711 | ||
712 | #ifndef SYS_sigreturn | |
713 | #define SYS_sigreturn 0x77 | |
714 | #endif | |
715 | #ifndef SYS_rt_sigreturn | |
716 | #define SYS_rt_sigreturn 0xad | |
717 | #endif | |
718 | ||
719 | /* Offset to saved processor flags, from <asm/sigcontext.h>. */ | |
720 | #define LINUX_SIGCONTEXT_EFLAGS_OFFSET (64) | |
721 | ||
722 | /* Resume execution of the inferior process. | |
723 | If STEP is nonzero, single-step it. | |
724 | If SIGNAL is nonzero, give it that signal. */ | |
725 | ||
10d6c8cd DJ |
726 | static void |
727 | i386_linux_resume (ptid_t ptid, int step, enum target_signal signal) | |
a6abb2c0 | 728 | { |
39f77062 KB |
729 | int pid = PIDGET (ptid); |
730 | ||
a6abb2c0 MK |
731 | int request = PTRACE_CONT; |
732 | ||
733 | if (pid == -1) | |
734 | /* Resume all threads. */ | |
735 | /* I think this only gets used in the non-threaded case, where "resume | |
39f77062 KB |
736 | all threads" and "resume inferior_ptid" are the same. */ |
737 | pid = PIDGET (inferior_ptid); | |
a6abb2c0 MK |
738 | |
739 | if (step) | |
740 | { | |
7b86a1b8 UW |
741 | struct cleanup *old_chain = save_inferior_ptid (); |
742 | struct regcache *regcache = current_regcache; | |
743 | ULONGEST pc; | |
8e70166d | 744 | gdb_byte buf[LINUX_SYSCALL_LEN]; |
a6abb2c0 MK |
745 | |
746 | request = PTRACE_SINGLESTEP; | |
747 | ||
7b86a1b8 UW |
748 | inferior_ptid = pid_to_ptid (pid); |
749 | regcache_cooked_read_unsigned (regcache, PC_REGNUM, &pc); | |
750 | ||
a6abb2c0 MK |
751 | /* Returning from a signal trampoline is done by calling a |
752 | special system call (sigreturn or rt_sigreturn, see | |
753 | i386-linux-tdep.c for more information). This system call | |
754 | restores the registers that were saved when the signal was | |
755 | raised, including %eflags. That means that single-stepping | |
756 | won't work. Instead, we'll have to modify the signal context | |
757 | that's about to be restored, and set the trace flag there. */ | |
758 | ||
759 | /* First check if PC is at a system call. */ | |
359a9262 | 760 | if (read_memory_nobpt (pc, buf, LINUX_SYSCALL_LEN) == 0 |
a6abb2c0 MK |
761 | && memcmp (buf, linux_syscall, LINUX_SYSCALL_LEN) == 0) |
762 | { | |
7b86a1b8 UW |
763 | ULONGEST syscall; |
764 | regcache_cooked_read_unsigned (regcache, | |
765 | LINUX_SYSCALL_REGNUM, &syscall); | |
a6abb2c0 MK |
766 | |
767 | /* Then check the system call number. */ | |
768 | if (syscall == SYS_sigreturn || syscall == SYS_rt_sigreturn) | |
769 | { | |
7b86a1b8 | 770 | ULONGEST sp, addr; |
a6abb2c0 | 771 | unsigned long int eflags; |
7bf0983e | 772 | |
7b86a1b8 | 773 | regcache_cooked_read_unsigned (regcache, I386_ESP_REGNUM, &sp); |
a6abb2c0 MK |
774 | if (syscall == SYS_rt_sigreturn) |
775 | addr = read_memory_integer (sp + 8, 4) + 20; | |
7b86a1b8 UW |
776 | else |
777 | addr = sp; | |
a6abb2c0 MK |
778 | |
779 | /* Set the trace flag in the context that's about to be | |
780 | restored. */ | |
781 | addr += LINUX_SIGCONTEXT_EFLAGS_OFFSET; | |
8e70166d | 782 | read_memory (addr, (gdb_byte *) &eflags, 4); |
a6abb2c0 | 783 | eflags |= 0x0100; |
8e70166d | 784 | write_memory (addr, (gdb_byte *) &eflags, 4); |
a6abb2c0 MK |
785 | } |
786 | } | |
7b86a1b8 UW |
787 | |
788 | do_cleanups (old_chain); | |
a6abb2c0 MK |
789 | } |
790 | ||
791 | if (ptrace (request, pid, 0, target_signal_to_host (signal)) == -1) | |
e2e0b3e5 | 792 | perror_with_name (("ptrace")); |
a6abb2c0 | 793 | } |
4de4c07c | 794 | |
10d6c8cd DJ |
795 | static void (*super_post_startup_inferior) (ptid_t ptid); |
796 | ||
797 | static void | |
798 | i386_linux_child_post_startup_inferior (ptid_t ptid) | |
4de4c07c DJ |
799 | { |
800 | i386_cleanup_dregs (); | |
10d6c8cd DJ |
801 | super_post_startup_inferior (ptid); |
802 | } | |
803 | ||
804 | void | |
805 | _initialize_i386_linux_nat (void) | |
806 | { | |
807 | struct target_ops *t; | |
808 | ||
809 | /* Fill in the generic GNU/Linux methods. */ | |
810 | t = linux_target (); | |
811 | ||
812 | /* Override the default ptrace resume method. */ | |
813 | t->to_resume = i386_linux_resume; | |
814 | ||
815 | /* Override the GNU/Linux inferior startup hook. */ | |
816 | super_post_startup_inferior = t->to_post_startup_inferior; | |
817 | t->to_post_startup_inferior = i386_linux_child_post_startup_inferior; | |
818 | ||
819 | /* Add our register access methods. */ | |
820 | t->to_fetch_registers = i386_linux_fetch_inferior_registers; | |
821 | t->to_store_registers = i386_linux_store_inferior_registers; | |
822 | ||
823 | /* Register the target. */ | |
f973ed9c | 824 | linux_nat_add_target (t); |
4de4c07c | 825 | } |