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a4b6fc86 | 1 | /* Native-dependent code for GNU/Linux x86-64. |
0a65a603 | 2 | |
1bac305b | 3 | Copyright 2001, 2002, 2003 Free Software Foundation, Inc. |
0a65a603 | 4 | |
53e95fcf JS |
5 | Contributed by Jiri Smid, SuSE Labs. |
6 | ||
7 | This file is part of GDB. | |
8 | ||
9 | This program is free software; you can redistribute it and/or modify | |
10 | it under the terms of the GNU General Public License as published by | |
11 | the Free Software Foundation; either version 2 of the License, or | |
12 | (at your option) any later version. | |
13 | ||
14 | This program is distributed in the hope that it will be useful, | |
15 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | GNU General Public License for more details. | |
18 | ||
19 | You should have received a copy of the GNU General Public License | |
20 | along with this program; if not, write to the Free Software | |
21 | Foundation, Inc., 59 Temple Place - Suite 330, | |
22 | Boston, MA 02111-1307, USA. */ | |
23 | ||
24 | #include "defs.h" | |
25 | #include "inferior.h" | |
26 | #include "gdbcore.h" | |
27 | #include "regcache.h" | |
c4f35dd8 | 28 | |
53e95fcf | 29 | #include "gdb_assert.h" |
30d52491 | 30 | #include "gdb_string.h" |
53e95fcf JS |
31 | #include <sys/ptrace.h> |
32 | #include <sys/debugreg.h> | |
33 | #include <sys/syscall.h> | |
34 | #include <sys/procfs.h> | |
c43af07c EZ |
35 | #include <asm/prctl.h> |
36 | /* FIXME ezannoni-2003-07-09: we need <sys/reg.h> to be included after | |
37 | <asm/ptrace.h> because the latter redefines FS and GS for no apparent | |
38 | reason, and those definitions don't match the ones that libpthread_db | |
39 | uses, which come from <sys/reg.h>. */ | |
40 | /* ezannoni-2003-07-09: I think this is fixed. The extraneous defs have | |
41 | been removed from ptrace.h in the kernel. However, better safe than | |
42 | sorry. */ | |
43 | #include <asm/ptrace.h> | |
33a0a2ac | 44 | #include <sys/reg.h> |
c43af07c | 45 | #include "gdb_proc_service.h" |
33a0a2ac | 46 | |
c4f35dd8 MK |
47 | /* Prototypes for supply_gregset etc. */ |
48 | #include "gregset.h" | |
49 | ||
50 | #include "x86-64-tdep.h" | |
eba29c8c | 51 | #include "x86-64-linux-tdep.h" |
53e95fcf | 52 | |
c4f35dd8 MK |
53 | /* Which ptrace request retrieves which registers? |
54 | These apply to the corresponding SET requests as well. */ | |
53e95fcf JS |
55 | |
56 | #define GETREGS_SUPPLIES(regno) \ | |
c4f35dd8 MK |
57 | (0 <= (regno) && (regno) < X86_64_NUM_GREGS) |
58 | ||
53e95fcf JS |
59 | #define GETFPREGS_SUPPLIES(regno) \ |
60 | (FP0_REGNUM <= (regno) && (regno) <= MXCSR_REGNUM) | |
53e95fcf JS |
61 | \f |
62 | ||
63 | /* Transfering the general-purpose registers between GDB, inferiors | |
64 | and core files. */ | |
65 | ||
66 | /* Fill GDB's register array with the general-purpose register values | |
67 | in *GREGSETP. */ | |
68 | ||
69 | void | |
c4f35dd8 | 70 | supply_gregset (elf_gregset_t *gregsetp) |
53e95fcf | 71 | { |
eba29c8c | 72 | x86_64_linux_supply_gregset ((char *) gregsetp); |
53e95fcf JS |
73 | } |
74 | ||
75 | /* Fill register REGNO (if it is a general-purpose register) in | |
76 | *GREGSETPS with the value in GDB's register array. If REGNO is -1, | |
77 | do this for all registers. */ | |
78 | ||
79 | void | |
c4f35dd8 | 80 | fill_gregset (elf_gregset_t *gregsetp, int regno) |
53e95fcf | 81 | { |
eba29c8c | 82 | x86_64_linux_fill_gregset ((char *) gregsetp, regno); |
53e95fcf JS |
83 | } |
84 | ||
85 | /* Fetch all general-purpose registers from process/thread TID and | |
86 | store their values in GDB's register array. */ | |
87 | ||
88 | static void | |
89 | fetch_regs (int tid) | |
90 | { | |
91 | elf_gregset_t regs; | |
92 | ||
93 | if (ptrace (PTRACE_GETREGS, tid, 0, (long) ®s) < 0) | |
7b3fabf0 | 94 | perror_with_name ("Couldn't get registers"); |
53e95fcf JS |
95 | |
96 | supply_gregset (®s); | |
97 | } | |
98 | ||
99 | /* Store all valid general-purpose registers in GDB's register array | |
100 | into the process/thread specified by TID. */ | |
101 | ||
102 | static void | |
103 | store_regs (int tid, int regno) | |
104 | { | |
105 | elf_gregset_t regs; | |
106 | ||
107 | if (ptrace (PTRACE_GETREGS, tid, 0, (long) ®s) < 0) | |
108 | perror_with_name ("Couldn't get registers"); | |
109 | ||
110 | fill_gregset (®s, regno); | |
111 | ||
112 | if (ptrace (PTRACE_SETREGS, tid, 0, (long) ®s) < 0) | |
113 | perror_with_name ("Couldn't write registers"); | |
114 | } | |
115 | \f | |
116 | ||
117 | /* Transfering floating-point registers between GDB, inferiors and cores. */ | |
118 | ||
8dda9770 | 119 | /* Fill GDB's register array with the floating-point and SSE register |
c4f35dd8 | 120 | values in *FPREGSETP. */ |
53e95fcf JS |
121 | |
122 | void | |
c4f35dd8 | 123 | supply_fpregset (elf_fpregset_t *fpregsetp) |
53e95fcf | 124 | { |
c4f35dd8 | 125 | x86_64_supply_fxsave ((char *) fpregsetp); |
53e95fcf JS |
126 | } |
127 | ||
8dda9770 | 128 | /* Fill register REGNUM (if it is a floating-point or SSE register) in |
c4f35dd8 MK |
129 | *FPREGSETP with the value in GDB's register array. If REGNUM is |
130 | -1, do this for all registers. */ | |
53e95fcf JS |
131 | |
132 | void | |
c4f35dd8 | 133 | fill_fpregset (elf_fpregset_t *fpregsetp, int regnum) |
53e95fcf | 134 | { |
c4f35dd8 | 135 | x86_64_fill_fxsave ((char *) fpregsetp, regnum); |
53e95fcf JS |
136 | } |
137 | ||
138 | /* Fetch all floating-point registers from process/thread TID and store | |
139 | thier values in GDB's register array. */ | |
140 | ||
141 | static void | |
142 | fetch_fpregs (int tid) | |
143 | { | |
144 | elf_fpregset_t fpregs; | |
145 | ||
146 | if (ptrace (PTRACE_GETFPREGS, tid, 0, (long) &fpregs) < 0) | |
147 | perror_with_name ("Couldn't get floating point status"); | |
148 | ||
149 | supply_fpregset (&fpregs); | |
150 | } | |
151 | ||
152 | /* Store all valid floating-point registers in GDB's register array | |
153 | into the process/thread specified by TID. */ | |
154 | ||
155 | static void | |
156 | store_fpregs (int tid, int regno) | |
157 | { | |
158 | elf_fpregset_t fpregs; | |
159 | ||
160 | if (ptrace (PTRACE_GETFPREGS, tid, 0, (long) &fpregs) < 0) | |
161 | perror_with_name ("Couldn't get floating point status"); | |
162 | ||
163 | fill_fpregset (&fpregs, regno); | |
164 | ||
165 | if (ptrace (PTRACE_SETFPREGS, tid, 0, (long) &fpregs) < 0) | |
166 | perror_with_name ("Couldn't write floating point status"); | |
167 | } | |
168 | \f | |
169 | ||
170 | /* Transferring arbitrary registers between GDB and inferior. */ | |
171 | ||
172 | /* Fetch register REGNO from the child process. If REGNO is -1, do | |
173 | this for all registers (including the floating point and SSE | |
174 | registers). */ | |
175 | ||
176 | void | |
177 | fetch_inferior_registers (int regno) | |
178 | { | |
179 | int tid; | |
180 | ||
a4b6fc86 | 181 | /* GNU/Linux LWP ID's are process ID's. */ |
c4f35dd8 MK |
182 | tid = TIDGET (inferior_ptid); |
183 | if (tid == 0) | |
184 | tid = PIDGET (inferior_ptid); /* Not a threaded program. */ | |
53e95fcf JS |
185 | |
186 | if (regno == -1) | |
187 | { | |
188 | fetch_regs (tid); | |
189 | fetch_fpregs (tid); | |
190 | return; | |
191 | } | |
192 | ||
193 | if (GETREGS_SUPPLIES (regno)) | |
194 | { | |
195 | fetch_regs (tid); | |
196 | return; | |
197 | } | |
198 | ||
199 | if (GETFPREGS_SUPPLIES (regno)) | |
200 | { | |
201 | fetch_fpregs (tid); | |
202 | return; | |
203 | } | |
204 | ||
205 | internal_error (__FILE__, __LINE__, | |
206 | "Got request for bad register number %d.", regno); | |
207 | } | |
208 | ||
209 | /* Store register REGNO back into the child process. If REGNO is -1, | |
c4f35dd8 | 210 | do this for all registers (including the floating-point and SSE |
53e95fcf | 211 | registers). */ |
c4f35dd8 | 212 | |
53e95fcf JS |
213 | void |
214 | store_inferior_registers (int regno) | |
215 | { | |
216 | int tid; | |
217 | ||
a4b6fc86 | 218 | /* GNU/Linux LWP ID's are process ID's. */ |
c4f35dd8 MK |
219 | tid = TIDGET (inferior_ptid); |
220 | if (tid == 0) | |
221 | tid = PIDGET (inferior_ptid); /* Not a threaded program. */ | |
53e95fcf JS |
222 | |
223 | if (regno == -1) | |
224 | { | |
225 | store_regs (tid, regno); | |
226 | store_fpregs (tid, regno); | |
227 | return; | |
228 | } | |
229 | ||
230 | if (GETREGS_SUPPLIES (regno)) | |
231 | { | |
232 | store_regs (tid, regno); | |
233 | return; | |
234 | } | |
235 | ||
236 | if (GETFPREGS_SUPPLIES (regno)) | |
237 | { | |
238 | store_fpregs (tid, regno); | |
239 | return; | |
240 | } | |
241 | ||
242 | internal_error (__FILE__, __LINE__, | |
243 | "Got request to store bad register number %d.", regno); | |
244 | } | |
245 | \f | |
246 | ||
c4f35dd8 MK |
247 | static unsigned long |
248 | x86_64_linux_dr_get (int regnum) | |
249 | { | |
250 | int tid; | |
251 | unsigned long value; | |
53e95fcf | 252 | |
c4f35dd8 MK |
253 | /* FIXME: kettenis/2001-01-29: It's not clear what we should do with |
254 | multi-threaded processes here. For now, pretend there is just | |
255 | one thread. */ | |
256 | tid = PIDGET (inferior_ptid); | |
53e95fcf | 257 | |
c4f35dd8 MK |
258 | /* FIXME: kettenis/2001-03-27: Calling perror_with_name if the |
259 | ptrace call fails breaks debugging remote targets. The correct | |
260 | way to fix this is to add the hardware breakpoint and watchpoint | |
261 | stuff to the target vectore. For now, just return zero if the | |
262 | ptrace call fails. */ | |
263 | errno = 0; | |
264 | value = ptrace (PT_READ_U, tid, | |
265 | offsetof (struct user, u_debugreg[regnum]), 0); | |
266 | if (errno != 0) | |
267 | #if 0 | |
268 | perror_with_name ("Couldn't read debug register"); | |
269 | #else | |
270 | return 0; | |
53e95fcf JS |
271 | #endif |
272 | ||
c4f35dd8 MK |
273 | return value; |
274 | } | |
53e95fcf JS |
275 | |
276 | static void | |
c4f35dd8 | 277 | x86_64_linux_dr_set (int regnum, unsigned long value) |
53e95fcf | 278 | { |
c4f35dd8 | 279 | int tid; |
53e95fcf | 280 | |
c4f35dd8 MK |
281 | /* FIXME: kettenis/2001-01-29: It's not clear what we should do with |
282 | multi-threaded processes here. For now, pretend there is just | |
283 | one thread. */ | |
284 | tid = PIDGET (inferior_ptid); | |
53e95fcf | 285 | |
c4f35dd8 MK |
286 | errno = 0; |
287 | ptrace (PT_WRITE_U, tid, offsetof (struct user, u_debugreg[regnum]), value); | |
288 | if (errno != 0) | |
289 | perror_with_name ("Couldn't write debug register"); | |
290 | } | |
53e95fcf | 291 | |
c4f35dd8 MK |
292 | void |
293 | x86_64_linux_dr_set_control (unsigned long control) | |
294 | { | |
295 | x86_64_linux_dr_set (DR_CONTROL, control); | |
296 | } | |
53e95fcf | 297 | |
c4f35dd8 MK |
298 | void |
299 | x86_64_linux_dr_set_addr (int regnum, CORE_ADDR addr) | |
b7c4cbf8 | 300 | { |
c4f35dd8 MK |
301 | gdb_assert (regnum >= 0 && regnum <= DR_LASTADDR - DR_FIRSTADDR); |
302 | ||
303 | x86_64_linux_dr_set (DR_FIRSTADDR + regnum, addr); | |
b7c4cbf8 AJ |
304 | } |
305 | ||
53e95fcf | 306 | void |
c4f35dd8 | 307 | x86_64_linux_dr_reset_addr (int regnum) |
53e95fcf | 308 | { |
c4f35dd8 MK |
309 | gdb_assert (regnum >= 0 && regnum <= DR_LASTADDR - DR_FIRSTADDR); |
310 | ||
311 | x86_64_linux_dr_set (DR_FIRSTADDR + regnum, 0L); | |
53e95fcf | 312 | } |
8cfda98c | 313 | |
c4f35dd8 MK |
314 | unsigned long |
315 | x86_64_linux_dr_get_status (void) | |
8cfda98c | 316 | { |
c4f35dd8 | 317 | return x86_64_linux_dr_get (DR_STATUS); |
8cfda98c | 318 | } |
c43af07c EZ |
319 | |
320 | extern ps_err_e | |
321 | ps_get_thread_area (const struct ps_prochandle *ph, | |
322 | lwpid_t lwpid, int idx, void **base) | |
323 | { | |
324 | ||
325 | /* This definition comes from prctl.h, but some kernels may not have it. */ | |
326 | #ifndef PTRACE_ARCH_PRCTL | |
327 | #define PTRACE_ARCH_PRCTL 30 | |
328 | #endif | |
329 | ||
330 | /* FIXME: ezannoni-2003-07-09 see comment above about include file order. | |
331 | We could be getting bogus values for these two. */ | |
332 | gdb_assert (FS < ELF_NGREG); | |
333 | gdb_assert (GS < ELF_NGREG); | |
334 | switch (idx) | |
335 | { | |
336 | case FS: | |
337 | if (ptrace (PTRACE_ARCH_PRCTL, lwpid, base, ARCH_GET_FS) == 0) | |
338 | return PS_OK; | |
339 | break; | |
340 | case GS: | |
341 | if (ptrace (PTRACE_ARCH_PRCTL, lwpid, base, ARCH_GET_GS) == 0) | |
342 | return PS_OK; | |
343 | break; | |
344 | default: /* Should not happen. */ | |
345 | return PS_BADADDR; | |
346 | } | |
347 | return PS_ERR; /* ptrace failed. */ | |
348 | } | |
349 |