Commit | Line | Data |
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a4194092 | 1 | /* Native-dependent code for GNU/Linux i386. |
a4b6fc86 | 2 | |
0fb0cc75 JB |
3 | Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, |
4 | 2009 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 | |
a9762ec7 | 10 | the Free Software Foundation; either version 3 of the License, or |
04cd15b6 | 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 | 18 | You should have received a copy of the GNU General Public License |
a9762ec7 | 19 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
d4f3574e SS |
20 | |
21 | #include "defs.h" | |
22 | #include "inferior.h" | |
23 | #include "gdbcore.h" | |
4e052eda | 24 | #include "regcache.h" |
10d6c8cd | 25 | #include "target.h" |
4de4c07c | 26 | #include "linux-nat.h" |
d4f3574e | 27 | |
84346e11 | 28 | #include "gdb_assert.h" |
309367d4 | 29 | #include "gdb_string.h" |
d4f3574e SS |
30 | #include <sys/ptrace.h> |
31 | #include <sys/user.h> | |
32 | #include <sys/procfs.h> | |
33 | ||
34 | #ifdef HAVE_SYS_REG_H | |
35 | #include <sys/reg.h> | |
36 | #endif | |
37 | ||
ce556f85 MK |
38 | #ifndef ORIG_EAX |
39 | #define ORIG_EAX -1 | |
40 | #endif | |
41 | ||
84346e11 MK |
42 | #ifdef HAVE_SYS_DEBUGREG_H |
43 | #include <sys/debugreg.h> | |
44 | #endif | |
45 | ||
46 | #ifndef DR_FIRSTADDR | |
47 | #define DR_FIRSTADDR 0 | |
48 | #endif | |
49 | ||
50 | #ifndef DR_LASTADDR | |
51 | #define DR_LASTADDR 3 | |
52 | #endif | |
53 | ||
54 | #ifndef DR_STATUS | |
55 | #define DR_STATUS 6 | |
56 | #endif | |
57 | ||
58 | #ifndef DR_CONTROL | |
59 | #define DR_CONTROL 7 | |
60 | #endif | |
61 | ||
6ce2ac0b | 62 | /* Prototypes for supply_gregset etc. */ |
c60c0f5f MS |
63 | #include "gregset.h" |
64 | ||
e750d25e | 65 | #include "i387-tdep.h" |
c3833324 | 66 | #include "i386-tdep.h" |
5179e78f AC |
67 | #include "i386-linux-tdep.h" |
68 | ||
b757528f JJ |
69 | /* Defines ps_err_e, struct ps_prochandle. */ |
70 | #include "gdb_proc_service.h" | |
6ce2ac0b | 71 | \f |
d4f3574e | 72 | |
a4b6fc86 AC |
73 | /* The register sets used in GNU/Linux ELF core-dumps are identical to |
74 | the register sets in `struct user' that is used for a.out | |
75 | core-dumps, and is also used by `ptrace'. The corresponding types | |
76 | are `elf_gregset_t' for the general-purpose registers (with | |
04cd15b6 MK |
77 | `elf_greg_t' the type of a single GP register) and `elf_fpregset_t' |
78 | for the floating-point registers. | |
79 | ||
80 | Those types used to be available under the names `gregset_t' and | |
81 | `fpregset_t' too, and this file used those names in the past. But | |
82 | those names are now used for the register sets used in the | |
83 | `mcontext_t' type, and have a different size and layout. */ | |
84 | ||
85 | /* Mapping between the general-purpose registers in `struct user' | |
86 | format and GDB's register array layout. */ | |
d4f3574e SS |
87 | static int regmap[] = |
88 | { | |
89 | EAX, ECX, EDX, EBX, | |
90 | UESP, EBP, ESI, EDI, | |
91 | EIP, EFL, CS, SS, | |
ce556f85 MK |
92 | DS, ES, FS, GS, |
93 | -1, -1, -1, -1, /* st0, st1, st2, st3 */ | |
94 | -1, -1, -1, -1, /* st4, st5, st6, st7 */ | |
95 | -1, -1, -1, -1, /* fctrl, fstat, ftag, fiseg */ | |
96 | -1, -1, -1, -1, /* fioff, foseg, fooff, fop */ | |
97 | -1, -1, -1, -1, /* xmm0, xmm1, xmm2, xmm3 */ | |
98 | -1, -1, -1, -1, /* xmm4, xmm5, xmm6, xmm6 */ | |
99 | -1, /* mxcsr */ | |
100 | ORIG_EAX | |
d4f3574e SS |
101 | }; |
102 | ||
5c44784c JM |
103 | /* Which ptrace request retrieves which registers? |
104 | These apply to the corresponding SET requests as well. */ | |
e64a344c | 105 | |
5c44784c | 106 | #define GETREGS_SUPPLIES(regno) \ |
3fb1c838 | 107 | ((0 <= (regno) && (regno) <= 15) || (regno) == I386_LINUX_ORIG_EAX_REGNUM) |
e64a344c | 108 | |
6ce2ac0b | 109 | #define GETFPXREGS_SUPPLIES(regno) \ |
f6792ef4 | 110 | (I386_ST0_REGNUM <= (regno) && (regno) < I386_SSE_NUM_REGS) |
5c44784c | 111 | |
f60300e7 MK |
112 | /* Does the current host support the GETREGS request? */ |
113 | int have_ptrace_getregs = | |
114 | #ifdef HAVE_PTRACE_GETREGS | |
115 | 1 | |
116 | #else | |
117 | 0 | |
118 | #endif | |
119 | ; | |
120 | ||
6ce2ac0b | 121 | /* Does the current host support the GETFPXREGS request? The header |
5c44784c JM |
122 | file may or may not define it, and even if it is defined, the |
123 | kernel will return EIO if it's running on a pre-SSE processor. | |
124 | ||
125 | My instinct is to attach this to some architecture- or | |
126 | target-specific data structure, but really, a particular GDB | |
127 | process can only run on top of one kernel at a time. So it's okay | |
128 | for this to be a simple variable. */ | |
6ce2ac0b MK |
129 | int have_ptrace_getfpxregs = |
130 | #ifdef HAVE_PTRACE_GETFPXREGS | |
5c44784c JM |
131 | 1 |
132 | #else | |
133 | 0 | |
134 | #endif | |
135 | ; | |
f60300e7 | 136 | \f |
6ce2ac0b | 137 | |
ce556f85 | 138 | /* Accessing registers through the U area, one at a time. */ |
f60300e7 MK |
139 | |
140 | /* Fetch one register. */ | |
141 | ||
142 | static void | |
56be3814 | 143 | fetch_register (struct regcache *regcache, int regno) |
f60300e7 | 144 | { |
f60300e7 | 145 | int tid; |
ce556f85 | 146 | int val; |
f60300e7 | 147 | |
ce556f85 | 148 | gdb_assert (!have_ptrace_getregs); |
de732108 | 149 | if (regmap[regno] == -1) |
f60300e7 | 150 | { |
56be3814 | 151 | regcache_raw_supply (regcache, regno, NULL); |
f60300e7 MK |
152 | return; |
153 | } | |
154 | ||
ce556f85 | 155 | /* GNU/Linux LWP ID's are process ID's. */ |
e64a344c MK |
156 | tid = TIDGET (inferior_ptid); |
157 | if (tid == 0) | |
158 | tid = PIDGET (inferior_ptid); /* Not a threaded program. */ | |
f60300e7 | 159 | |
ce556f85 | 160 | errno = 0; |
de732108 | 161 | val = ptrace (PTRACE_PEEKUSER, tid, 4 * regmap[regno], 0); |
ce556f85 | 162 | if (errno != 0) |
c9f4d572 | 163 | error (_("Couldn't read register %s (#%d): %s."), |
875f8d0e | 164 | gdbarch_register_name (get_regcache_arch (regcache), regno), |
ce556f85 | 165 | regno, safe_strerror (errno)); |
f60300e7 | 166 | |
56be3814 | 167 | regcache_raw_supply (regcache, regno, &val); |
f60300e7 MK |
168 | } |
169 | ||
f60300e7 MK |
170 | /* Store one register. */ |
171 | ||
172 | static void | |
56be3814 | 173 | store_register (const struct regcache *regcache, int regno) |
f60300e7 | 174 | { |
f60300e7 | 175 | int tid; |
ce556f85 | 176 | int val; |
f60300e7 | 177 | |
ce556f85 | 178 | gdb_assert (!have_ptrace_getregs); |
de732108 | 179 | if (regmap[regno] == -1) |
ce556f85 | 180 | return; |
f60300e7 | 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 | 187 | errno = 0; |
56be3814 | 188 | regcache_raw_collect (regcache, regno, &val); |
de732108 | 189 | ptrace (PTRACE_POKEUSER, tid, 4 * regmap[regno], val); |
ce556f85 | 190 | if (errno != 0) |
c9f4d572 | 191 | error (_("Couldn't write register %s (#%d): %s."), |
875f8d0e | 192 | gdbarch_register_name (get_regcache_arch (regcache), regno), |
ce556f85 | 193 | regno, safe_strerror (errno)); |
f60300e7 | 194 | } |
5c44784c | 195 | \f |
6ce2ac0b | 196 | |
04cd15b6 MK |
197 | /* Transfering the general-purpose registers between GDB, inferiors |
198 | and core files. */ | |
199 | ||
ad2a4d09 | 200 | /* Fill GDB's register array with the general-purpose register values |
04cd15b6 | 201 | in *GREGSETP. */ |
5c44784c | 202 | |
d4f3574e | 203 | void |
7f7fe91e | 204 | supply_gregset (struct regcache *regcache, const elf_gregset_t *gregsetp) |
d4f3574e | 205 | { |
7f7fe91e | 206 | const elf_greg_t *regp = (const elf_greg_t *) gregsetp; |
6ce2ac0b | 207 | int i; |
d4f3574e | 208 | |
98df6387 | 209 | for (i = 0; i < I386_NUM_GREGS; i++) |
7f7fe91e | 210 | regcache_raw_supply (regcache, i, regp + regmap[i]); |
3fb1c838 | 211 | |
875f8d0e UW |
212 | if (I386_LINUX_ORIG_EAX_REGNUM |
213 | < gdbarch_num_regs (get_regcache_arch (regcache))) | |
7f7fe91e | 214 | regcache_raw_supply (regcache, I386_LINUX_ORIG_EAX_REGNUM, |
31828840 | 215 | regp + ORIG_EAX); |
917317f4 JM |
216 | } |
217 | ||
04cd15b6 MK |
218 | /* Fill register REGNO (if it is a general-purpose register) in |
219 | *GREGSETPS with the value in GDB's register array. If REGNO is -1, | |
220 | do this for all registers. */ | |
6ce2ac0b | 221 | |
917317f4 | 222 | void |
7f7fe91e UW |
223 | fill_gregset (const struct regcache *regcache, |
224 | elf_gregset_t *gregsetp, int regno) | |
917317f4 | 225 | { |
6ce2ac0b MK |
226 | elf_greg_t *regp = (elf_greg_t *) gregsetp; |
227 | int i; | |
04cd15b6 | 228 | |
98df6387 | 229 | for (i = 0; i < I386_NUM_GREGS; i++) |
099a9414 | 230 | if (regno == -1 || regno == i) |
7f7fe91e | 231 | regcache_raw_collect (regcache, i, regp + regmap[i]); |
3fb1c838 | 232 | |
82ea117a | 233 | if ((regno == -1 || regno == I386_LINUX_ORIG_EAX_REGNUM) |
875f8d0e UW |
234 | && I386_LINUX_ORIG_EAX_REGNUM |
235 | < gdbarch_num_regs (get_regcache_arch (regcache))) | |
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; |
2e024c20 | 249 | elf_gregset_t *regs_p = ®s; |
5c44784c | 250 | |
6ce2ac0b | 251 | if (ptrace (PTRACE_GETREGS, tid, 0, (int) ®s) < 0) |
5c44784c | 252 | { |
f60300e7 MK |
253 | if (errno == EIO) |
254 | { | |
255 | /* The kernel we're running on doesn't support the GETREGS | |
256 | request. Reset `have_ptrace_getregs'. */ | |
257 | have_ptrace_getregs = 0; | |
258 | return; | |
259 | } | |
260 | ||
e2e0b3e5 | 261 | perror_with_name (_("Couldn't get registers")); |
5c44784c JM |
262 | } |
263 | ||
2e024c20 | 264 | supply_gregset (regcache, (const elf_gregset_t *) regs_p); |
5c44784c JM |
265 | } |
266 | ||
04cd15b6 MK |
267 | /* Store all valid general-purpose registers in GDB's register array |
268 | into the process/thread specified by TID. */ | |
5c44784c | 269 | |
5c44784c | 270 | static void |
56be3814 | 271 | store_regs (const struct regcache *regcache, int tid, int regno) |
5c44784c | 272 | { |
04cd15b6 | 273 | elf_gregset_t regs; |
5c44784c | 274 | |
6ce2ac0b | 275 | if (ptrace (PTRACE_GETREGS, tid, 0, (int) ®s) < 0) |
e2e0b3e5 | 276 | perror_with_name (_("Couldn't get registers")); |
5c44784c | 277 | |
56be3814 | 278 | fill_gregset (regcache, ®s, regno); |
6ce2ac0b MK |
279 | |
280 | if (ptrace (PTRACE_SETREGS, tid, 0, (int) ®s) < 0) | |
e2e0b3e5 | 281 | perror_with_name (_("Couldn't write registers")); |
5c44784c JM |
282 | } |
283 | ||
f60300e7 MK |
284 | #else |
285 | ||
56be3814 UW |
286 | static void fetch_regs (struct regcache *regcache, int tid) {} |
287 | static void store_regs (const struct regcache *regcache, int tid, int regno) {} | |
f60300e7 MK |
288 | |
289 | #endif | |
5c44784c | 290 | \f |
5c44784c | 291 | |
6ce2ac0b | 292 | /* Transfering floating-point registers between GDB, inferiors and cores. */ |
d4f3574e | 293 | |
04cd15b6 | 294 | /* Fill GDB's register array with the floating-point register values in |
917317f4 | 295 | *FPREGSETP. */ |
04cd15b6 | 296 | |
d4f3574e | 297 | void |
7f7fe91e | 298 | supply_fpregset (struct regcache *regcache, const elf_fpregset_t *fpregsetp) |
d4f3574e | 299 | { |
7f7fe91e | 300 | i387_supply_fsave (regcache, -1, fpregsetp); |
917317f4 | 301 | } |
d4f3574e | 302 | |
04cd15b6 MK |
303 | /* Fill register REGNO (if it is a floating-point register) in |
304 | *FPREGSETP with the value in GDB's register array. If REGNO is -1, | |
305 | do this for all registers. */ | |
917317f4 JM |
306 | |
307 | void | |
7f7fe91e UW |
308 | fill_fpregset (const struct regcache *regcache, |
309 | elf_fpregset_t *fpregsetp, int regno) | |
917317f4 | 310 | { |
7f7fe91e | 311 | i387_collect_fsave (regcache, regno, fpregsetp); |
d4f3574e SS |
312 | } |
313 | ||
f60300e7 MK |
314 | #ifdef HAVE_PTRACE_GETREGS |
315 | ||
04cd15b6 MK |
316 | /* Fetch all floating-point registers from process/thread TID and store |
317 | thier values in GDB's register array. */ | |
917317f4 | 318 | |
d4f3574e | 319 | static void |
56be3814 | 320 | fetch_fpregs (struct regcache *regcache, int tid) |
d4f3574e | 321 | { |
04cd15b6 | 322 | elf_fpregset_t fpregs; |
d4f3574e | 323 | |
6ce2ac0b | 324 | if (ptrace (PTRACE_GETFPREGS, tid, 0, (int) &fpregs) < 0) |
e2e0b3e5 | 325 | perror_with_name (_("Couldn't get floating point status")); |
d4f3574e | 326 | |
56be3814 | 327 | supply_fpregset (regcache, (const elf_fpregset_t *) &fpregs); |
d4f3574e SS |
328 | } |
329 | ||
04cd15b6 MK |
330 | /* Store all valid floating-point registers in GDB's register array |
331 | into the process/thread specified by TID. */ | |
d4f3574e | 332 | |
d4f3574e | 333 | static void |
56be3814 | 334 | store_fpregs (const struct regcache *regcache, int tid, int regno) |
d4f3574e | 335 | { |
04cd15b6 | 336 | elf_fpregset_t fpregs; |
d4f3574e | 337 | |
6ce2ac0b | 338 | if (ptrace (PTRACE_GETFPREGS, tid, 0, (int) &fpregs) < 0) |
e2e0b3e5 | 339 | perror_with_name (_("Couldn't get floating point status")); |
d4f3574e | 340 | |
56be3814 | 341 | fill_fpregset (regcache, &fpregs, regno); |
d4f3574e | 342 | |
6ce2ac0b | 343 | if (ptrace (PTRACE_SETFPREGS, tid, 0, (int) &fpregs) < 0) |
e2e0b3e5 | 344 | perror_with_name (_("Couldn't write floating point status")); |
d4f3574e SS |
345 | } |
346 | ||
f60300e7 MK |
347 | #else |
348 | ||
56be3814 UW |
349 | static void fetch_fpregs (struct regcache *regcache, int tid) {} |
350 | static void store_fpregs (const struct regcache *regcache, int tid, int regno) {} | |
f60300e7 MK |
351 | |
352 | #endif | |
5c44784c | 353 | \f |
d4f3574e | 354 | |
6ce2ac0b | 355 | /* Transfering floating-point and SSE registers to and from GDB. */ |
11cf8741 | 356 | |
6ce2ac0b | 357 | #ifdef HAVE_PTRACE_GETFPXREGS |
04cd15b6 MK |
358 | |
359 | /* Fill GDB's register array with the floating-point and SSE register | |
6ce2ac0b | 360 | values in *FPXREGSETP. */ |
04cd15b6 | 361 | |
975aec09 | 362 | void |
7f7fe91e UW |
363 | supply_fpxregset (struct regcache *regcache, |
364 | const elf_fpxregset_t *fpxregsetp) | |
d4f3574e | 365 | { |
7f7fe91e | 366 | i387_supply_fxsave (regcache, -1, fpxregsetp); |
d4f3574e SS |
367 | } |
368 | ||
6ce2ac0b MK |
369 | /* Fill register REGNO (if it is a floating-point or SSE register) in |
370 | *FPXREGSETP with the value in GDB's register array. If REGNO is | |
371 | -1, do this for all registers. */ | |
d4f3574e | 372 | |
975aec09 | 373 | void |
7f7fe91e UW |
374 | fill_fpxregset (const struct regcache *regcache, |
375 | elf_fpxregset_t *fpxregsetp, int regno) | |
d4f3574e | 376 | { |
7f7fe91e | 377 | i387_collect_fxsave (regcache, regno, fpxregsetp); |
5c44784c JM |
378 | } |
379 | ||
6ce2ac0b | 380 | /* Fetch all registers covered by the PTRACE_GETFPXREGS request from |
04cd15b6 MK |
381 | process/thread TID and store their values in GDB's register array. |
382 | Return non-zero if successful, zero otherwise. */ | |
5c44784c | 383 | |
5c44784c | 384 | static int |
56be3814 | 385 | fetch_fpxregs (struct regcache *regcache, int tid) |
5c44784c | 386 | { |
6ce2ac0b | 387 | elf_fpxregset_t fpxregs; |
5c44784c | 388 | |
6ce2ac0b | 389 | if (! have_ptrace_getfpxregs) |
5c44784c JM |
390 | return 0; |
391 | ||
6ce2ac0b | 392 | if (ptrace (PTRACE_GETFPXREGS, tid, 0, (int) &fpxregs) < 0) |
d4f3574e | 393 | { |
5c44784c JM |
394 | if (errno == EIO) |
395 | { | |
6ce2ac0b | 396 | have_ptrace_getfpxregs = 0; |
5c44784c JM |
397 | return 0; |
398 | } | |
399 | ||
e2e0b3e5 | 400 | perror_with_name (_("Couldn't read floating-point and SSE registers")); |
d4f3574e SS |
401 | } |
402 | ||
56be3814 | 403 | supply_fpxregset (regcache, (const elf_fpxregset_t *) &fpxregs); |
5c44784c JM |
404 | return 1; |
405 | } | |
d4f3574e | 406 | |
04cd15b6 | 407 | /* Store all valid registers in GDB's register array covered by the |
6ce2ac0b | 408 | PTRACE_SETFPXREGS request into the process/thread specified by TID. |
04cd15b6 | 409 | Return non-zero if successful, zero otherwise. */ |
5c44784c | 410 | |
5c44784c | 411 | static int |
56be3814 | 412 | store_fpxregs (const struct regcache *regcache, int tid, int regno) |
5c44784c | 413 | { |
6ce2ac0b | 414 | elf_fpxregset_t fpxregs; |
5c44784c | 415 | |
6ce2ac0b | 416 | if (! have_ptrace_getfpxregs) |
5c44784c | 417 | return 0; |
6ce2ac0b MK |
418 | |
419 | if (ptrace (PTRACE_GETFPXREGS, tid, 0, &fpxregs) == -1) | |
2866d305 MK |
420 | { |
421 | if (errno == EIO) | |
422 | { | |
423 | have_ptrace_getfpxregs = 0; | |
424 | return 0; | |
425 | } | |
426 | ||
e2e0b3e5 | 427 | perror_with_name (_("Couldn't read floating-point and SSE registers")); |
2866d305 | 428 | } |
5c44784c | 429 | |
56be3814 | 430 | fill_fpxregset (regcache, &fpxregs, regno); |
5c44784c | 431 | |
6ce2ac0b | 432 | if (ptrace (PTRACE_SETFPXREGS, tid, 0, &fpxregs) == -1) |
e2e0b3e5 | 433 | perror_with_name (_("Couldn't write floating-point and SSE registers")); |
5c44784c JM |
434 | |
435 | return 1; | |
436 | } | |
437 | ||
5c44784c JM |
438 | #else |
439 | ||
56be3814 UW |
440 | static int fetch_fpxregs (struct regcache *regcache, int tid) { return 0; } |
441 | static int store_fpxregs (const struct regcache *regcache, int tid, int regno) { return 0; } | |
5c44784c | 442 | |
6ce2ac0b | 443 | #endif /* HAVE_PTRACE_GETFPXREGS */ |
5c44784c | 444 | \f |
6ce2ac0b | 445 | |
5c44784c | 446 | /* Transferring arbitrary registers between GDB and inferior. */ |
d4f3574e | 447 | |
04cd15b6 MK |
448 | /* Fetch register REGNO from the child process. If REGNO is -1, do |
449 | this for all registers (including the floating point and SSE | |
450 | registers). */ | |
d4f3574e | 451 | |
10d6c8cd | 452 | static void |
28439f5e PA |
453 | i386_linux_fetch_inferior_registers (struct target_ops *ops, |
454 | struct regcache *regcache, int regno) | |
d4f3574e | 455 | { |
ed9a39eb JM |
456 | int tid; |
457 | ||
f60300e7 MK |
458 | /* Use the old method of peeking around in `struct user' if the |
459 | GETREGS request isn't available. */ | |
ce556f85 | 460 | if (!have_ptrace_getregs) |
f60300e7 | 461 | { |
ce556f85 MK |
462 | int i; |
463 | ||
875f8d0e | 464 | for (i = 0; i < gdbarch_num_regs (get_regcache_arch (regcache)); i++) |
ce556f85 | 465 | if (regno == -1 || regno == i) |
56be3814 | 466 | fetch_register (regcache, i); |
ce556f85 | 467 | |
f60300e7 MK |
468 | return; |
469 | } | |
470 | ||
a4b6fc86 | 471 | /* GNU/Linux LWP ID's are process ID's. */ |
e64a344c MK |
472 | tid = TIDGET (inferior_ptid); |
473 | if (tid == 0) | |
474 | tid = PIDGET (inferior_ptid); /* Not a threaded program. */ | |
ed9a39eb | 475 | |
6ce2ac0b | 476 | /* Use the PTRACE_GETFPXREGS request whenever possible, since it |
04cd15b6 | 477 | transfers more registers in one system call, and we'll cache the |
6ce2ac0b | 478 | results. But remember that fetch_fpxregs can fail, and return |
04cd15b6 | 479 | zero. */ |
5c44784c JM |
480 | if (regno == -1) |
481 | { | |
56be3814 | 482 | fetch_regs (regcache, tid); |
f60300e7 MK |
483 | |
484 | /* The call above might reset `have_ptrace_getregs'. */ | |
ce556f85 | 485 | if (!have_ptrace_getregs) |
f60300e7 | 486 | { |
84e473c8 | 487 | i386_linux_fetch_inferior_registers (ops, regcache, regno); |
f60300e7 MK |
488 | return; |
489 | } | |
490 | ||
56be3814 | 491 | if (fetch_fpxregs (regcache, tid)) |
5c44784c | 492 | return; |
56be3814 | 493 | fetch_fpregs (regcache, tid); |
5c44784c JM |
494 | return; |
495 | } | |
d4f3574e | 496 | |
5c44784c JM |
497 | if (GETREGS_SUPPLIES (regno)) |
498 | { | |
56be3814 | 499 | fetch_regs (regcache, tid); |
5c44784c JM |
500 | return; |
501 | } | |
502 | ||
6ce2ac0b | 503 | if (GETFPXREGS_SUPPLIES (regno)) |
5c44784c | 504 | { |
56be3814 | 505 | if (fetch_fpxregs (regcache, tid)) |
5c44784c JM |
506 | return; |
507 | ||
508 | /* Either our processor or our kernel doesn't support the SSE | |
509 | registers, so read the FP registers in the traditional way, | |
510 | and fill the SSE registers with dummy values. It would be | |
511 | more graceful to handle differences in the register set using | |
512 | gdbarch. Until then, this will at least make things work | |
513 | plausibly. */ | |
56be3814 | 514 | fetch_fpregs (regcache, tid); |
5c44784c JM |
515 | return; |
516 | } | |
517 | ||
8e65ff28 | 518 | internal_error (__FILE__, __LINE__, |
e2e0b3e5 | 519 | _("Got request for bad register number %d."), regno); |
d4f3574e SS |
520 | } |
521 | ||
04cd15b6 MK |
522 | /* Store register REGNO back into the child process. If REGNO is -1, |
523 | do this for all registers (including the floating point and SSE | |
524 | registers). */ | |
10d6c8cd | 525 | static void |
28439f5e PA |
526 | i386_linux_store_inferior_registers (struct target_ops *ops, |
527 | struct regcache *regcache, int regno) | |
d4f3574e | 528 | { |
ed9a39eb JM |
529 | int tid; |
530 | ||
f60300e7 MK |
531 | /* Use the old method of poking around in `struct user' if the |
532 | SETREGS request isn't available. */ | |
ce556f85 | 533 | if (!have_ptrace_getregs) |
f60300e7 | 534 | { |
ce556f85 MK |
535 | int i; |
536 | ||
875f8d0e | 537 | for (i = 0; i < gdbarch_num_regs (get_regcache_arch (regcache)); i++) |
ce556f85 | 538 | if (regno == -1 || regno == i) |
56be3814 | 539 | store_register (regcache, i); |
ce556f85 | 540 | |
f60300e7 MK |
541 | return; |
542 | } | |
543 | ||
a4b6fc86 | 544 | /* GNU/Linux LWP ID's are process ID's. */ |
e64a344c MK |
545 | tid = TIDGET (inferior_ptid); |
546 | if (tid == 0) | |
547 | tid = PIDGET (inferior_ptid); /* Not a threaded program. */ | |
ed9a39eb | 548 | |
6ce2ac0b | 549 | /* Use the PTRACE_SETFPXREGS requests whenever possible, since it |
04cd15b6 | 550 | transfers more registers in one system call. But remember that |
6ce2ac0b | 551 | store_fpxregs can fail, and return zero. */ |
5c44784c JM |
552 | if (regno == -1) |
553 | { | |
56be3814 UW |
554 | store_regs (regcache, tid, regno); |
555 | if (store_fpxregs (regcache, tid, regno)) | |
5c44784c | 556 | return; |
56be3814 | 557 | store_fpregs (regcache, tid, regno); |
5c44784c JM |
558 | return; |
559 | } | |
d4f3574e | 560 | |
5c44784c JM |
561 | if (GETREGS_SUPPLIES (regno)) |
562 | { | |
56be3814 | 563 | store_regs (regcache, tid, regno); |
5c44784c JM |
564 | return; |
565 | } | |
566 | ||
6ce2ac0b | 567 | if (GETFPXREGS_SUPPLIES (regno)) |
5c44784c | 568 | { |
56be3814 | 569 | if (store_fpxregs (regcache, tid, regno)) |
5c44784c JM |
570 | return; |
571 | ||
572 | /* Either our processor or our kernel doesn't support the SSE | |
04cd15b6 MK |
573 | registers, so just write the FP registers in the traditional |
574 | way. */ | |
56be3814 | 575 | store_fpregs (regcache, tid, regno); |
5c44784c JM |
576 | return; |
577 | } | |
578 | ||
8e65ff28 | 579 | internal_error (__FILE__, __LINE__, |
e2e0b3e5 | 580 | _("Got request to store bad register number %d."), regno); |
d4f3574e | 581 | } |
de57eccd | 582 | \f |
6ce2ac0b | 583 | |
4ffc8466 MK |
584 | /* Support for debug registers. */ |
585 | ||
9f0bdab8 DJ |
586 | static unsigned long i386_linux_dr[DR_CONTROL + 1]; |
587 | ||
7bf0983e | 588 | static unsigned long |
9f0bdab8 | 589 | i386_linux_dr_get (ptid_t ptid, int regnum) |
84346e11 MK |
590 | { |
591 | int tid; | |
7bf0983e | 592 | unsigned long value; |
84346e11 | 593 | |
9f0bdab8 DJ |
594 | tid = TIDGET (ptid); |
595 | if (tid == 0) | |
596 | tid = PIDGET (ptid); | |
84346e11 | 597 | |
b9511b9a MK |
598 | /* FIXME: kettenis/2001-03-27: Calling perror_with_name if the |
599 | ptrace call fails breaks debugging remote targets. The correct | |
600 | way to fix this is to add the hardware breakpoint and watchpoint | |
7532965f | 601 | stuff to the target vector. For now, just return zero if the |
b9511b9a | 602 | ptrace call fails. */ |
84346e11 | 603 | errno = 0; |
ce556f85 | 604 | value = ptrace (PTRACE_PEEKUSER, tid, |
84346e11 MK |
605 | offsetof (struct user, u_debugreg[regnum]), 0); |
606 | if (errno != 0) | |
b9511b9a | 607 | #if 0 |
e2e0b3e5 | 608 | perror_with_name (_("Couldn't read debug register")); |
b9511b9a MK |
609 | #else |
610 | return 0; | |
611 | #endif | |
84346e11 MK |
612 | |
613 | return value; | |
614 | } | |
615 | ||
616 | static void | |
9f0bdab8 | 617 | i386_linux_dr_set (ptid_t ptid, int regnum, unsigned long value) |
84346e11 MK |
618 | { |
619 | int tid; | |
620 | ||
9f0bdab8 DJ |
621 | tid = TIDGET (ptid); |
622 | if (tid == 0) | |
623 | tid = PIDGET (ptid); | |
84346e11 MK |
624 | |
625 | errno = 0; | |
ce556f85 | 626 | ptrace (PTRACE_POKEUSER, tid, |
84346e11 MK |
627 | offsetof (struct user, u_debugreg[regnum]), value); |
628 | if (errno != 0) | |
e2e0b3e5 | 629 | perror_with_name (_("Couldn't write debug register")); |
84346e11 MK |
630 | } |
631 | ||
632 | void | |
7bf0983e | 633 | i386_linux_dr_set_control (unsigned long control) |
84346e11 | 634 | { |
9f0bdab8 DJ |
635 | struct lwp_info *lp; |
636 | ptid_t ptid; | |
637 | ||
638 | i386_linux_dr[DR_CONTROL] = control; | |
639 | ALL_LWPS (lp, ptid) | |
640 | i386_linux_dr_set (ptid, DR_CONTROL, control); | |
84346e11 MK |
641 | } |
642 | ||
643 | void | |
644 | i386_linux_dr_set_addr (int regnum, CORE_ADDR addr) | |
645 | { | |
9f0bdab8 DJ |
646 | struct lwp_info *lp; |
647 | ptid_t ptid; | |
648 | ||
84346e11 MK |
649 | gdb_assert (regnum >= 0 && regnum <= DR_LASTADDR - DR_FIRSTADDR); |
650 | ||
9f0bdab8 DJ |
651 | i386_linux_dr[DR_FIRSTADDR + regnum] = addr; |
652 | ALL_LWPS (lp, ptid) | |
653 | i386_linux_dr_set (ptid, DR_FIRSTADDR + regnum, addr); | |
84346e11 MK |
654 | } |
655 | ||
656 | void | |
657 | i386_linux_dr_reset_addr (int regnum) | |
658 | { | |
9f0bdab8 | 659 | i386_linux_dr_set_addr (regnum, 0); |
84346e11 MK |
660 | } |
661 | ||
7bf0983e | 662 | unsigned long |
84346e11 MK |
663 | i386_linux_dr_get_status (void) |
664 | { | |
9f0bdab8 DJ |
665 | return i386_linux_dr_get (inferior_ptid, DR_STATUS); |
666 | } | |
667 | ||
668 | static void | |
669 | i386_linux_new_thread (ptid_t ptid) | |
670 | { | |
671 | int i; | |
672 | ||
673 | for (i = DR_FIRSTADDR; i <= DR_LASTADDR; i++) | |
674 | i386_linux_dr_set (ptid, i, i386_linux_dr[i]); | |
675 | ||
676 | i386_linux_dr_set (ptid, DR_CONTROL, i386_linux_dr[DR_CONTROL]); | |
84346e11 MK |
677 | } |
678 | \f | |
679 | ||
5bca7895 MK |
680 | /* Called by libthread_db. Returns a pointer to the thread local |
681 | storage (or its descriptor). */ | |
682 | ||
683 | ps_err_e | |
684 | ps_get_thread_area (const struct ps_prochandle *ph, | |
685 | lwpid_t lwpid, int idx, void **base) | |
686 | { | |
687 | /* NOTE: cagney/2003-08-26: The definition of this buffer is found | |
688 | in the kernel header <asm-i386/ldt.h>. It, after padding, is 4 x | |
689 | 4 byte integers in size: `entry_number', `base_addr', `limit', | |
690 | and a bunch of status bits. | |
691 | ||
692 | The values returned by this ptrace call should be part of the | |
693 | regcache buffer, and ps_get_thread_area should channel its | |
694 | request through the regcache. That way remote targets could | |
695 | provide the value using the remote protocol and not this direct | |
696 | call. | |
697 | ||
698 | Is this function needed? I'm guessing that the `base' is the | |
699 | address of a a descriptor that libthread_db uses to find the | |
b2fa5097 | 700 | thread local address base that GDB needs. Perhaps that |
5bca7895 MK |
701 | descriptor is defined by the ABI. Anyway, given that |
702 | libthread_db calls this function without prompting (gdb | |
703 | requesting tls base) I guess it needs info in there anyway. */ | |
704 | unsigned int desc[4]; | |
705 | gdb_assert (sizeof (int) == 4); | |
706 | ||
707 | #ifndef PTRACE_GET_THREAD_AREA | |
708 | #define PTRACE_GET_THREAD_AREA 25 | |
709 | #endif | |
710 | ||
711 | if (ptrace (PTRACE_GET_THREAD_AREA, lwpid, | |
712 | (void *) idx, (unsigned long) &desc) < 0) | |
713 | return PS_ERR; | |
714 | ||
715 | *(int *)base = desc[1]; | |
716 | return PS_OK; | |
717 | } | |
718 | \f | |
719 | ||
a4b6fc86 | 720 | /* The instruction for a GNU/Linux system call is: |
a6abb2c0 MK |
721 | int $0x80 |
722 | or 0xcd 0x80. */ | |
723 | ||
724 | static const unsigned char linux_syscall[] = { 0xcd, 0x80 }; | |
725 | ||
726 | #define LINUX_SYSCALL_LEN (sizeof linux_syscall) | |
727 | ||
728 | /* The system call number is stored in the %eax register. */ | |
7532965f | 729 | #define LINUX_SYSCALL_REGNUM I386_EAX_REGNUM |
a6abb2c0 MK |
730 | |
731 | /* We are specifically interested in the sigreturn and rt_sigreturn | |
732 | system calls. */ | |
733 | ||
734 | #ifndef SYS_sigreturn | |
735 | #define SYS_sigreturn 0x77 | |
736 | #endif | |
737 | #ifndef SYS_rt_sigreturn | |
738 | #define SYS_rt_sigreturn 0xad | |
739 | #endif | |
740 | ||
741 | /* Offset to saved processor flags, from <asm/sigcontext.h>. */ | |
742 | #define LINUX_SIGCONTEXT_EFLAGS_OFFSET (64) | |
743 | ||
744 | /* Resume execution of the inferior process. | |
745 | If STEP is nonzero, single-step it. | |
746 | If SIGNAL is nonzero, give it that signal. */ | |
747 | ||
10d6c8cd | 748 | static void |
28439f5e PA |
749 | i386_linux_resume (struct target_ops *ops, |
750 | ptid_t ptid, int step, enum target_signal signal) | |
a6abb2c0 | 751 | { |
39f77062 KB |
752 | int pid = PIDGET (ptid); |
753 | ||
a6abb2c0 MK |
754 | int request = PTRACE_CONT; |
755 | ||
a6abb2c0 MK |
756 | if (step) |
757 | { | |
594f7785 | 758 | struct regcache *regcache = get_thread_regcache (pid_to_ptid (pid)); |
7b86a1b8 | 759 | ULONGEST pc; |
8e70166d | 760 | gdb_byte buf[LINUX_SYSCALL_LEN]; |
a6abb2c0 MK |
761 | |
762 | request = PTRACE_SINGLESTEP; | |
763 | ||
875f8d0e UW |
764 | regcache_cooked_read_unsigned |
765 | (regcache, gdbarch_pc_regnum (get_regcache_arch (regcache)), &pc); | |
7b86a1b8 | 766 | |
a6abb2c0 MK |
767 | /* Returning from a signal trampoline is done by calling a |
768 | special system call (sigreturn or rt_sigreturn, see | |
769 | i386-linux-tdep.c for more information). This system call | |
770 | restores the registers that were saved when the signal was | |
771 | raised, including %eflags. That means that single-stepping | |
772 | won't work. Instead, we'll have to modify the signal context | |
773 | that's about to be restored, and set the trace flag there. */ | |
774 | ||
775 | /* First check if PC is at a system call. */ | |
8defab1a | 776 | if (target_read_memory (pc, buf, LINUX_SYSCALL_LEN) == 0 |
a6abb2c0 MK |
777 | && memcmp (buf, linux_syscall, LINUX_SYSCALL_LEN) == 0) |
778 | { | |
7b86a1b8 UW |
779 | ULONGEST syscall; |
780 | regcache_cooked_read_unsigned (regcache, | |
781 | LINUX_SYSCALL_REGNUM, &syscall); | |
a6abb2c0 MK |
782 | |
783 | /* Then check the system call number. */ | |
784 | if (syscall == SYS_sigreturn || syscall == SYS_rt_sigreturn) | |
785 | { | |
7b86a1b8 | 786 | ULONGEST sp, addr; |
a6abb2c0 | 787 | unsigned long int eflags; |
7bf0983e | 788 | |
7b86a1b8 | 789 | regcache_cooked_read_unsigned (regcache, I386_ESP_REGNUM, &sp); |
a6abb2c0 MK |
790 | if (syscall == SYS_rt_sigreturn) |
791 | addr = read_memory_integer (sp + 8, 4) + 20; | |
7b86a1b8 UW |
792 | else |
793 | addr = sp; | |
a6abb2c0 MK |
794 | |
795 | /* Set the trace flag in the context that's about to be | |
796 | restored. */ | |
797 | addr += LINUX_SIGCONTEXT_EFLAGS_OFFSET; | |
8e70166d | 798 | read_memory (addr, (gdb_byte *) &eflags, 4); |
a6abb2c0 | 799 | eflags |= 0x0100; |
8e70166d | 800 | write_memory (addr, (gdb_byte *) &eflags, 4); |
a6abb2c0 MK |
801 | } |
802 | } | |
803 | } | |
804 | ||
805 | if (ptrace (request, pid, 0, target_signal_to_host (signal)) == -1) | |
e2e0b3e5 | 806 | perror_with_name (("ptrace")); |
a6abb2c0 | 807 | } |
4de4c07c | 808 | |
10d6c8cd DJ |
809 | static void (*super_post_startup_inferior) (ptid_t ptid); |
810 | ||
811 | static void | |
812 | i386_linux_child_post_startup_inferior (ptid_t ptid) | |
4de4c07c DJ |
813 | { |
814 | i386_cleanup_dregs (); | |
10d6c8cd DJ |
815 | super_post_startup_inferior (ptid); |
816 | } | |
817 | ||
818 | void | |
819 | _initialize_i386_linux_nat (void) | |
820 | { | |
821 | struct target_ops *t; | |
822 | ||
823 | /* Fill in the generic GNU/Linux methods. */ | |
824 | t = linux_target (); | |
825 | ||
c03374d5 DJ |
826 | i386_use_watchpoints (t); |
827 | ||
10d6c8cd DJ |
828 | /* Override the default ptrace resume method. */ |
829 | t->to_resume = i386_linux_resume; | |
830 | ||
831 | /* Override the GNU/Linux inferior startup hook. */ | |
832 | super_post_startup_inferior = t->to_post_startup_inferior; | |
833 | t->to_post_startup_inferior = i386_linux_child_post_startup_inferior; | |
834 | ||
835 | /* Add our register access methods. */ | |
836 | t->to_fetch_registers = i386_linux_fetch_inferior_registers; | |
837 | t->to_store_registers = i386_linux_store_inferior_registers; | |
838 | ||
839 | /* Register the target. */ | |
f973ed9c | 840 | linux_nat_add_target (t); |
9f0bdab8 | 841 | linux_nat_set_new_thread (t, i386_linux_new_thread); |
4de4c07c | 842 | } |