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e6031aeb | 1 | /* Native-dependent code for modern i386 BSD's. |
4e052eda | 2 | Copyright 2000, 2001 Free Software Foundation, Inc. |
e6031aeb MK |
3 | |
4 | This file is part of GDB. | |
5 | ||
6 | This program is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 2 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | This program is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with this program; if not, write to the Free Software | |
18 | Foundation, Inc., 59 Temple Place - Suite 330, | |
19 | Boston, MA 02111-1307, USA. */ | |
20 | ||
21 | #include "defs.h" | |
22 | #include "inferior.h" | |
4e052eda | 23 | #include "regcache.h" |
e6031aeb | 24 | |
0afdd437 | 25 | #include "gdb_assert.h" |
e6031aeb MK |
26 | #include <sys/types.h> |
27 | #include <sys/ptrace.h> | |
28 | #include <machine/reg.h> | |
29 | #include <machine/frame.h> | |
30 | ||
31 | #ifdef HAVE_SYS_PROCFS_H | |
32 | #include <sys/procfs.h> | |
33 | #endif | |
34 | ||
35 | #ifndef HAVE_GREGSET_T | |
36 | typedef struct reg gregset_t; | |
37 | #endif | |
38 | ||
39 | #ifndef HAVE_FPREGSET_T | |
40 | typedef struct fpreg fpregset_t; | |
41 | #endif | |
42 | ||
b051bfa4 MK |
43 | #include "gregset.h" |
44 | \f | |
45 | ||
e6031aeb MK |
46 | /* In older BSD versions we cannot get at some of the segment |
47 | registers. FreeBSD for example didn't support the %fs and %gs | |
48 | registers until the 3.0 release. We have autoconf checks for their | |
49 | presence, and deal gracefully with their absence. */ | |
50 | ||
51 | /* Registers we shouldn't try to fetch. */ | |
52 | #if !defined (CANNOT_FETCH_REGISTER) | |
53 | #define CANNOT_FETCH_REGISTER(regno) cannot_fetch_register (regno) | |
54 | #endif | |
55 | ||
56 | /* Registers we shouldn't try to store. */ | |
57 | #if !defined (CANNOT_STORE_REGISTER) | |
b051bfa4 | 58 | #define CANNOT_STORE_REGISTER(regno) cannot_fetch_register (regno) |
e6031aeb MK |
59 | #endif |
60 | ||
61 | /* Offset to the gregset_t location where REG is stored. */ | |
62 | #define REG_OFFSET(reg) offsetof (gregset_t, reg) | |
63 | ||
64 | /* At reg_offset[REGNO] you'll find the offset to the gregset_t | |
65 | location where the GDB register REGNO is stored. Unsupported | |
66 | registers are marked with `-1'. */ | |
67 | static int reg_offset[] = | |
68 | { | |
69 | REG_OFFSET (r_eax), | |
70 | REG_OFFSET (r_ecx), | |
71 | REG_OFFSET (r_edx), | |
72 | REG_OFFSET (r_edx), | |
73 | REG_OFFSET (r_esp), | |
74 | REG_OFFSET (r_ebp), | |
75 | REG_OFFSET (r_esi), | |
76 | REG_OFFSET (r_edi), | |
77 | REG_OFFSET (r_eip), | |
78 | REG_OFFSET (r_eflags), | |
79 | REG_OFFSET (r_cs), | |
80 | REG_OFFSET (r_ss), | |
81 | REG_OFFSET (r_ds), | |
82 | REG_OFFSET (r_es), | |
422ea4b8 | 83 | #ifdef HAVE_STRUCT_REG_R_FS |
e6031aeb MK |
84 | REG_OFFSET (r_fs), |
85 | #else | |
86 | -1, | |
87 | #endif | |
422ea4b8 | 88 | #ifdef HAVE_STRUCT_REG_R_GS |
e6031aeb MK |
89 | REG_OFFSET (r_gs) |
90 | #else | |
91 | -1 | |
92 | #endif | |
93 | }; | |
94 | ||
95 | #define REG_ADDR(regset, regno) ((char *) (regset) + reg_offset[regno]) | |
96 | ||
97 | /* Return nonzero if we shouldn't try to fetch register REGNO. */ | |
98 | ||
99 | static int | |
100 | cannot_fetch_register (int regno) | |
101 | { | |
102 | return (reg_offset[regno] == -1); | |
103 | } | |
104 | \f | |
105 | ||
106 | /* Transfering the registers between GDB, inferiors and core files. */ | |
107 | ||
ad2a4d09 | 108 | /* Fill GDB's register array with the general-purpose register values |
e6031aeb MK |
109 | in *GREGSETP. */ |
110 | ||
111 | void | |
112 | supply_gregset (gregset_t *gregsetp) | |
113 | { | |
e6031aeb MK |
114 | int i; |
115 | ||
116 | for (i = 0; i < NUM_GREGS; i++) | |
117 | { | |
118 | if (CANNOT_FETCH_REGISTER (i)) | |
b051bfa4 | 119 | supply_register (i, NULL); |
e6031aeb MK |
120 | else |
121 | supply_register (i, REG_ADDR (gregsetp, i)); | |
122 | } | |
123 | } | |
124 | ||
125 | /* Fill register REGNO (if it is a general-purpose register) in | |
126 | *GREGSETPS with the value in GDB's register array. If REGNO is -1, | |
127 | do this for all registers. */ | |
128 | ||
129 | void | |
130 | fill_gregset (gregset_t *gregsetp, int regno) | |
131 | { | |
132 | int i; | |
133 | ||
134 | for (i = 0; i < NUM_GREGS; i++) | |
135 | if ((regno == -1 || regno == i) && ! CANNOT_STORE_REGISTER (i)) | |
b051bfa4 | 136 | memcpy (REG_ADDR (gregsetp, i), ®isters[REGISTER_BYTE (i)], |
e6031aeb MK |
137 | REGISTER_RAW_SIZE (i)); |
138 | } | |
139 | ||
140 | #include "i387-nat.h" | |
141 | ||
142 | /* Fill GDB's register array with the floating-point register values | |
143 | in *FPREGSETP. */ | |
144 | ||
145 | void | |
146 | supply_fpregset (fpregset_t *fpregsetp) | |
147 | { | |
148 | i387_supply_fsave ((char *) fpregsetp); | |
149 | } | |
150 | ||
151 | /* Fill register REGNO (if it is a floating-point register) in | |
152 | *FPREGSETP with the value in GDB's register array. If REGNO is -1, | |
153 | do this for all registers. */ | |
154 | ||
155 | void | |
156 | fill_fpregset (fpregset_t *fpregsetp, int regno) | |
157 | { | |
158 | i387_fill_fsave ((char *) fpregsetp, regno); | |
159 | } | |
160 | ||
161 | /* Fetch register REGNO from the inferior. If REGNO is -1, do this | |
162 | for all registers (including the floating point registers). */ | |
163 | ||
164 | void | |
165 | fetch_inferior_registers (int regno) | |
166 | { | |
167 | gregset_t gregs; | |
168 | ||
39f77062 KB |
169 | if (ptrace (PT_GETREGS, PIDGET (inferior_ptid), |
170 | (PTRACE_ARG3_TYPE) &gregs, 0) == -1) | |
e6031aeb MK |
171 | perror_with_name ("Couldn't get registers"); |
172 | ||
173 | supply_gregset (&gregs); | |
174 | ||
175 | if (regno == -1 || regno >= FP0_REGNUM) | |
176 | { | |
177 | fpregset_t fpregs; | |
178 | ||
39f77062 | 179 | if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid), |
e6031aeb MK |
180 | (PTRACE_ARG3_TYPE) &fpregs, 0) == -1) |
181 | perror_with_name ("Couldn't get floating point status"); | |
182 | ||
183 | supply_fpregset (&fpregs); | |
184 | } | |
b051bfa4 | 185 | } |
e6031aeb MK |
186 | |
187 | /* Store register REGNO back into the inferior. If REGNO is -1, do | |
188 | this for all registers (including the floating point registers). */ | |
189 | ||
190 | void | |
191 | store_inferior_registers (int regno) | |
192 | { | |
193 | gregset_t gregs; | |
194 | ||
39f77062 KB |
195 | if (ptrace (PT_GETREGS, PIDGET (inferior_ptid), |
196 | (PTRACE_ARG3_TYPE) &gregs, 0) == -1) | |
e6031aeb MK |
197 | perror_with_name ("Couldn't get registers"); |
198 | ||
199 | fill_gregset (&gregs, regno); | |
200 | ||
39f77062 | 201 | if (ptrace (PT_SETREGS, PIDGET (inferior_ptid), (PTRACE_ARG3_TYPE) &gregs, 0) == -1) |
e6031aeb MK |
202 | perror_with_name ("Couldn't write registers"); |
203 | ||
204 | if (regno == -1 || regno >= FP0_REGNUM) | |
205 | { | |
206 | fpregset_t fpregs; | |
207 | ||
39f77062 | 208 | if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid), |
e6031aeb MK |
209 | (PTRACE_ARG3_TYPE) &fpregs, 0) == -1) |
210 | perror_with_name ("Couldn't get floating point status"); | |
211 | ||
212 | fill_fpregset (&fpregs, regno); | |
213 | ||
39f77062 | 214 | if (ptrace (PT_SETFPREGS, PIDGET (inferior_ptid), |
e6031aeb MK |
215 | (PTRACE_ARG3_TYPE) &fpregs, 0) == -1) |
216 | perror_with_name ("Couldn't write floating point status"); | |
217 | } | |
218 | } | |
219 | \f | |
220 | ||
0afdd437 MK |
221 | /* Support for debug registers. */ |
222 | ||
223 | #ifdef HAVE_PT_GETDBREGS | |
224 | ||
225 | /* Not all versions of FreeBSD/i386 that support the debug registers | |
226 | have this macro. */ | |
227 | #ifndef DBREG_DRX | |
228 | #define DBREG_DRX(d, x) ((&d->dr0)[x]) | |
229 | #endif | |
230 | ||
231 | static void | |
232 | i386bsd_dr_set (int regnum, unsigned int value) | |
233 | { | |
234 | struct dbreg dbregs; | |
235 | ||
39f77062 KB |
236 | if (ptrace (PT_GETDBREGS, PIDGET (inferior_ptid), |
237 | (PTRACE_ARG3_TYPE) &dbregs, 0) == -1) | |
0afdd437 MK |
238 | perror_with_name ("Couldn't get debug registers"); |
239 | ||
240 | /* For some mysterious reason, some of the reserved bits in the | |
241 | debug control register get set. Mask these off, otherwise the | |
242 | ptrace call below will fail. */ | |
243 | dbregs.dr7 &= ~(0x0000fc00); | |
244 | ||
245 | DBREG_DRX ((&dbregs), regnum) = value; | |
246 | ||
39f77062 KB |
247 | if (ptrace (PT_SETDBREGS, PIDGET (inferior_ptid), |
248 | (PTRACE_ARG3_TYPE) &dbregs, 0) == -1) | |
0afdd437 MK |
249 | perror_with_name ("Couldn't write debug registers"); |
250 | } | |
251 | ||
252 | void | |
253 | i386bsd_dr_set_control (unsigned long control) | |
254 | { | |
255 | i386bsd_dr_set (7, control); | |
256 | } | |
257 | ||
258 | void | |
259 | i386bsd_dr_set_addr (int regnum, CORE_ADDR addr) | |
260 | { | |
261 | gdb_assert (regnum >= 0 && regnum <= 4); | |
262 | ||
263 | i386bsd_dr_set (regnum, addr); | |
264 | } | |
265 | ||
266 | void | |
267 | i386bsd_dr_reset_addr (int regnum) | |
268 | { | |
269 | gdb_assert (regnum >= 0 && regnum <= 4); | |
270 | ||
271 | i386bsd_dr_set (regnum, 0); | |
272 | } | |
273 | ||
274 | unsigned long | |
275 | i386bsd_dr_get_status (void) | |
276 | { | |
277 | struct dbreg dbregs; | |
278 | ||
279 | /* FIXME: kettenis/2001-03-31: Calling perror_with_name if the | |
280 | ptrace call fails breaks debugging remote targets. The correct | |
281 | way to fix this is to add the hardware breakpoint and watchpoint | |
282 | stuff to the target vectore. For now, just return zero if the | |
283 | ptrace call fails. */ | |
39f77062 KB |
284 | if (ptrace (PT_GETDBREGS, PIDGET (inferior_ptid), |
285 | (PTRACE_ARG3_TYPE) & dbregs, 0) == -1) | |
0afdd437 MK |
286 | #if 0 |
287 | perror_with_name ("Couldn't read debug registers"); | |
288 | #else | |
289 | return 0; | |
290 | #endif | |
291 | ||
292 | return dbregs.dr6; | |
293 | } | |
294 | ||
295 | #endif /* PT_GETDBREGS */ | |
296 | \f | |
297 | ||
e6031aeb MK |
298 | /* Support for the user struct. */ |
299 | ||
300 | /* Return the address register REGNO. BLOCKEND is the value of | |
301 | u.u_ar0, which should point to the registers. */ | |
302 | ||
303 | CORE_ADDR | |
304 | register_u_addr (CORE_ADDR blockend, int regno) | |
305 | { | |
306 | return (CORE_ADDR) REG_ADDR (blockend, regno); | |
307 | } | |
308 | ||
309 | #include <sys/param.h> | |
310 | #include <sys/user.h> | |
311 | ||
312 | /* Return the size of the user struct. */ | |
313 | ||
314 | int | |
315 | kernel_u_size (void) | |
316 | { | |
317 | return (sizeof (struct user)); | |
318 | } |