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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 MK |
24 | |
25 | #include <sys/types.h> | |
26 | #include <sys/ptrace.h> | |
27 | #include <machine/reg.h> | |
28 | #include <machine/frame.h> | |
29 | ||
30 | #ifdef HAVE_SYS_PROCFS_H | |
31 | #include <sys/procfs.h> | |
32 | #endif | |
33 | ||
34 | #ifndef HAVE_GREGSET_T | |
35 | typedef struct reg gregset_t; | |
36 | #endif | |
37 | ||
38 | #ifndef HAVE_FPREGSET_T | |
39 | typedef struct fpreg fpregset_t; | |
40 | #endif | |
41 | ||
b051bfa4 MK |
42 | #include "gregset.h" |
43 | \f | |
44 | ||
e6031aeb MK |
45 | /* In older BSD versions we cannot get at some of the segment |
46 | registers. FreeBSD for example didn't support the %fs and %gs | |
47 | registers until the 3.0 release. We have autoconf checks for their | |
48 | presence, and deal gracefully with their absence. */ | |
49 | ||
50 | /* Registers we shouldn't try to fetch. */ | |
51 | #if !defined (CANNOT_FETCH_REGISTER) | |
52 | #define CANNOT_FETCH_REGISTER(regno) cannot_fetch_register (regno) | |
53 | #endif | |
54 | ||
55 | /* Registers we shouldn't try to store. */ | |
56 | #if !defined (CANNOT_STORE_REGISTER) | |
b051bfa4 | 57 | #define CANNOT_STORE_REGISTER(regno) cannot_fetch_register (regno) |
e6031aeb MK |
58 | #endif |
59 | ||
60 | /* Offset to the gregset_t location where REG is stored. */ | |
61 | #define REG_OFFSET(reg) offsetof (gregset_t, reg) | |
62 | ||
63 | /* At reg_offset[REGNO] you'll find the offset to the gregset_t | |
64 | location where the GDB register REGNO is stored. Unsupported | |
65 | registers are marked with `-1'. */ | |
66 | static int reg_offset[] = | |
67 | { | |
68 | REG_OFFSET (r_eax), | |
69 | REG_OFFSET (r_ecx), | |
70 | REG_OFFSET (r_edx), | |
71 | REG_OFFSET (r_edx), | |
72 | REG_OFFSET (r_esp), | |
73 | REG_OFFSET (r_ebp), | |
74 | REG_OFFSET (r_esi), | |
75 | REG_OFFSET (r_edi), | |
76 | REG_OFFSET (r_eip), | |
77 | REG_OFFSET (r_eflags), | |
78 | REG_OFFSET (r_cs), | |
79 | REG_OFFSET (r_ss), | |
80 | REG_OFFSET (r_ds), | |
81 | REG_OFFSET (r_es), | |
422ea4b8 | 82 | #ifdef HAVE_STRUCT_REG_R_FS |
e6031aeb MK |
83 | REG_OFFSET (r_fs), |
84 | #else | |
85 | -1, | |
86 | #endif | |
422ea4b8 | 87 | #ifdef HAVE_STRUCT_REG_R_GS |
e6031aeb MK |
88 | REG_OFFSET (r_gs) |
89 | #else | |
90 | -1 | |
91 | #endif | |
92 | }; | |
93 | ||
94 | #define REG_ADDR(regset, regno) ((char *) (regset) + reg_offset[regno]) | |
95 | ||
96 | /* Return nonzero if we shouldn't try to fetch register REGNO. */ | |
97 | ||
98 | static int | |
99 | cannot_fetch_register (int regno) | |
100 | { | |
101 | return (reg_offset[regno] == -1); | |
102 | } | |
103 | \f | |
104 | ||
105 | /* Transfering the registers between GDB, inferiors and core files. */ | |
106 | ||
ad2a4d09 | 107 | /* Fill GDB's register array with the general-purpose register values |
e6031aeb MK |
108 | in *GREGSETP. */ |
109 | ||
110 | void | |
111 | supply_gregset (gregset_t *gregsetp) | |
112 | { | |
e6031aeb MK |
113 | int i; |
114 | ||
115 | for (i = 0; i < NUM_GREGS; i++) | |
116 | { | |
117 | if (CANNOT_FETCH_REGISTER (i)) | |
b051bfa4 | 118 | supply_register (i, NULL); |
e6031aeb MK |
119 | else |
120 | supply_register (i, REG_ADDR (gregsetp, i)); | |
121 | } | |
122 | } | |
123 | ||
124 | /* Fill register REGNO (if it is a general-purpose register) in | |
125 | *GREGSETPS with the value in GDB's register array. If REGNO is -1, | |
126 | do this for all registers. */ | |
127 | ||
128 | void | |
129 | fill_gregset (gregset_t *gregsetp, int regno) | |
130 | { | |
131 | int i; | |
132 | ||
133 | for (i = 0; i < NUM_GREGS; i++) | |
134 | if ((regno == -1 || regno == i) && ! CANNOT_STORE_REGISTER (i)) | |
b051bfa4 | 135 | memcpy (REG_ADDR (gregsetp, i), ®isters[REGISTER_BYTE (i)], |
e6031aeb MK |
136 | REGISTER_RAW_SIZE (i)); |
137 | } | |
138 | ||
139 | #include "i387-nat.h" | |
140 | ||
141 | /* Fill GDB's register array with the floating-point register values | |
142 | in *FPREGSETP. */ | |
143 | ||
144 | void | |
145 | supply_fpregset (fpregset_t *fpregsetp) | |
146 | { | |
147 | i387_supply_fsave ((char *) fpregsetp); | |
148 | } | |
149 | ||
150 | /* Fill register REGNO (if it is a floating-point register) in | |
151 | *FPREGSETP with the value in GDB's register array. If REGNO is -1, | |
152 | do this for all registers. */ | |
153 | ||
154 | void | |
155 | fill_fpregset (fpregset_t *fpregsetp, int regno) | |
156 | { | |
157 | i387_fill_fsave ((char *) fpregsetp, regno); | |
158 | } | |
159 | ||
160 | /* Fetch register REGNO from the inferior. If REGNO is -1, do this | |
161 | for all registers (including the floating point registers). */ | |
162 | ||
163 | void | |
164 | fetch_inferior_registers (int regno) | |
165 | { | |
166 | gregset_t gregs; | |
167 | ||
168 | if (ptrace (PT_GETREGS, inferior_pid, (PTRACE_ARG3_TYPE) &gregs, 0) == -1) | |
169 | perror_with_name ("Couldn't get registers"); | |
170 | ||
171 | supply_gregset (&gregs); | |
172 | ||
173 | if (regno == -1 || regno >= FP0_REGNUM) | |
174 | { | |
175 | fpregset_t fpregs; | |
176 | ||
177 | if (ptrace (PT_GETFPREGS, inferior_pid, | |
178 | (PTRACE_ARG3_TYPE) &fpregs, 0) == -1) | |
179 | perror_with_name ("Couldn't get floating point status"); | |
180 | ||
181 | supply_fpregset (&fpregs); | |
182 | } | |
b051bfa4 | 183 | } |
e6031aeb MK |
184 | |
185 | /* Store register REGNO back into the inferior. If REGNO is -1, do | |
186 | this for all registers (including the floating point registers). */ | |
187 | ||
188 | void | |
189 | store_inferior_registers (int regno) | |
190 | { | |
191 | gregset_t gregs; | |
192 | ||
193 | if (ptrace (PT_GETREGS, inferior_pid, (PTRACE_ARG3_TYPE) &gregs, 0) == -1) | |
194 | perror_with_name ("Couldn't get registers"); | |
195 | ||
196 | fill_gregset (&gregs, regno); | |
197 | ||
198 | if (ptrace (PT_SETREGS, inferior_pid, (PTRACE_ARG3_TYPE) &gregs, 0) == -1) | |
199 | perror_with_name ("Couldn't write registers"); | |
200 | ||
201 | if (regno == -1 || regno >= FP0_REGNUM) | |
202 | { | |
203 | fpregset_t fpregs; | |
204 | ||
205 | if (ptrace (PT_GETFPREGS, inferior_pid, | |
206 | (PTRACE_ARG3_TYPE) &fpregs, 0) == -1) | |
207 | perror_with_name ("Couldn't get floating point status"); | |
208 | ||
209 | fill_fpregset (&fpregs, regno); | |
210 | ||
211 | if (ptrace (PT_SETFPREGS, inferior_pid, | |
212 | (PTRACE_ARG3_TYPE) &fpregs, 0) == -1) | |
213 | perror_with_name ("Couldn't write floating point status"); | |
214 | } | |
215 | } | |
216 | \f | |
217 | ||
218 | /* Support for the user struct. */ | |
219 | ||
220 | /* Return the address register REGNO. BLOCKEND is the value of | |
221 | u.u_ar0, which should point to the registers. */ | |
222 | ||
223 | CORE_ADDR | |
224 | register_u_addr (CORE_ADDR blockend, int regno) | |
225 | { | |
226 | return (CORE_ADDR) REG_ADDR (blockend, regno); | |
227 | } | |
228 | ||
229 | #include <sys/param.h> | |
230 | #include <sys/user.h> | |
231 | ||
232 | /* Return the size of the user struct. */ | |
233 | ||
234 | int | |
235 | kernel_u_size (void) | |
236 | { | |
237 | return (sizeof (struct user)); | |
238 | } |