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c906108c SS |
1 | /* Intel 386 native support for SYSV systems (pre-SVR4). |
2 | Copyright (C) 1988, 89, 91, 92, 94, 96, 1998 Free Software Foundation, Inc. | |
3 | ||
4e326852 | 4 | This file is part of GDB. |
c906108c | 5 | |
4e326852 JB |
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. | |
c906108c | 10 | |
4e326852 JB |
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. | |
c906108c | 15 | |
4e326852 JB |
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. */ | |
c906108c SS |
20 | |
21 | #include "defs.h" | |
22 | ||
23 | #ifdef HAVE_PTRACE_H | |
4e326852 | 24 | #include <ptrace.h> |
c906108c | 25 | #else |
4e326852 JB |
26 | #ifdef HAVE_SYS_PTRACE_H |
27 | #include <sys/ptrace.h> | |
28 | #endif | |
c906108c SS |
29 | #endif |
30 | ||
31 | #include "frame.h" | |
32 | #include "inferior.h" | |
33 | #include "language.h" | |
34 | #include "gdbcore.h" | |
35 | ||
36 | #ifdef USG | |
37 | #include <sys/types.h> | |
38 | #endif | |
39 | ||
40 | #include <sys/param.h> | |
41 | #include <sys/dir.h> | |
42 | #include <signal.h> | |
43 | #include <sys/user.h> | |
44 | #include <sys/ioctl.h> | |
45 | #include <fcntl.h> | |
46 | ||
47 | ||
48 | /* FIXME: The following used to be just "#include <sys/debugreg.h>", but | |
49 | * the the Linux 2.1.x kernel and glibc 2.0.x are not in sync; including | |
50 | * <sys/debugreg.h> will result in an error. With luck, these losers | |
51 | * will get their act together and we can trash this hack in the near future. | |
52 | * --jsm 1998-10-21 | |
53 | */ | |
54 | ||
55 | #ifdef TARGET_HAS_HARDWARE_WATCHPOINTS | |
4e326852 JB |
56 | #ifdef HAVE_ASM_DEBUGREG_H |
57 | #include <asm/debugreg.h> | |
58 | #else | |
59 | #include <sys/debugreg.h> | |
60 | #endif | |
c906108c SS |
61 | #endif |
62 | ||
63 | #include <sys/file.h> | |
64 | #include "gdb_stat.h" | |
65 | ||
66 | #ifdef HAVE_SYS_REG_H | |
67 | #include <sys/reg.h> | |
68 | #endif | |
69 | ||
70 | #include "floatformat.h" | |
71 | ||
72 | #include "target.h" | |
77d2aaae | 73 | \f |
4e326852 | 74 | |
c906108c SS |
75 | /* this table must line up with REGISTER_NAMES in tm-i386v.h */ |
76 | /* symbols like 'EAX' come from <sys/reg.h> */ | |
4e326852 | 77 | static int regmap[] = |
c906108c SS |
78 | { |
79 | EAX, ECX, EDX, EBX, | |
80 | UESP, EBP, ESI, EDI, | |
81 | EIP, EFL, CS, SS, | |
82 | DS, ES, FS, GS, | |
83 | }; | |
84 | ||
85 | /* blockend is the value of u.u_ar0, and points to the | |
86 | * place where GS is stored | |
87 | */ | |
88 | ||
89 | int | |
fba45db2 | 90 | i386_register_u_addr (int blockend, int regnum) |
c906108c SS |
91 | { |
92 | struct user u; | |
93 | int fpstate; | |
94 | int ubase; | |
95 | ||
96 | ubase = blockend; | |
97 | /* FIXME: Should have better way to test floating point range */ | |
4e326852 | 98 | if (regnum >= FP0_REGNUM && regnum <= (FP0_REGNUM + 7)) |
c906108c | 99 | { |
4e326852 | 100 | #ifdef KSTKSZ /* SCO, and others? */ |
c906108c | 101 | ubase += 4 * (SS + 1) - KSTKSZ; |
4e326852 | 102 | fpstate = ubase + ((char *) &u.u_fps.u_fpstate - (char *) &u); |
c906108c SS |
103 | return (fpstate + 0x1c + 10 * (regnum - FP0_REGNUM)); |
104 | #else | |
4e326852 | 105 | fpstate = ubase + ((char *) &u.i387.st_space - (char *) &u); |
c906108c SS |
106 | return (fpstate + 10 * (regnum - FP0_REGNUM)); |
107 | #endif | |
4e326852 | 108 | } |
c906108c SS |
109 | else |
110 | { | |
111 | return (ubase + 4 * regmap[regnum]); | |
112 | } | |
4e326852 | 113 | |
c906108c SS |
114 | } |
115 | \f | |
116 | int | |
fba45db2 | 117 | kernel_u_size (void) |
c906108c SS |
118 | { |
119 | return (sizeof (struct user)); | |
120 | } | |
121 | \f | |
122 | #ifdef TARGET_HAS_HARDWARE_WATCHPOINTS | |
123 | ||
124 | #if !defined (offsetof) | |
125 | #define offsetof(TYPE, MEMBER) ((unsigned long) &((TYPE *)0)->MEMBER) | |
126 | #endif | |
127 | ||
128 | /* Record the value of the debug control register. */ | |
129 | static int debug_control_mirror; | |
130 | ||
131 | /* Record which address associates with which register. */ | |
132 | static CORE_ADDR address_lookup[DR_LASTADDR - DR_FIRSTADDR + 1]; | |
133 | ||
134 | static int | |
a14ed312 | 135 | i386_insert_aligned_watchpoint (int, CORE_ADDR, CORE_ADDR, int, int); |
c906108c SS |
136 | |
137 | static int | |
a14ed312 | 138 | i386_insert_nonaligned_watchpoint (int, CORE_ADDR, CORE_ADDR, int, int); |
c906108c SS |
139 | |
140 | /* Insert a watchpoint. */ | |
141 | ||
142 | int | |
fba45db2 | 143 | i386_insert_watchpoint (int pid, CORE_ADDR addr, int len, int rw) |
c906108c SS |
144 | { |
145 | return i386_insert_aligned_watchpoint (pid, addr, addr, len, rw); | |
146 | } | |
147 | ||
148 | static int | |
fba45db2 KB |
149 | i386_insert_aligned_watchpoint (int pid, CORE_ADDR waddr, CORE_ADDR addr, |
150 | int len, int rw) | |
c906108c SS |
151 | { |
152 | int i; | |
153 | int read_write_bits, len_bits; | |
154 | int free_debug_register; | |
155 | int register_number; | |
4e326852 | 156 | |
c906108c SS |
157 | /* Look for a free debug register. */ |
158 | for (i = DR_FIRSTADDR; i <= DR_LASTADDR; i++) | |
159 | { | |
160 | if (address_lookup[i - DR_FIRSTADDR] == 0) | |
161 | break; | |
162 | } | |
163 | ||
164 | /* No more debug registers! */ | |
165 | if (i > DR_LASTADDR) | |
166 | return -1; | |
167 | ||
168 | read_write_bits = (rw & 1) ? DR_RW_READ : DR_RW_WRITE; | |
169 | ||
170 | if (len == 1) | |
171 | len_bits = DR_LEN_1; | |
172 | else if (len == 2) | |
173 | { | |
174 | if (addr % 2) | |
175 | return i386_insert_nonaligned_watchpoint (pid, waddr, addr, len, rw); | |
176 | len_bits = DR_LEN_2; | |
177 | } | |
178 | ||
179 | else if (len == 4) | |
180 | { | |
181 | if (addr % 4) | |
182 | return i386_insert_nonaligned_watchpoint (pid, waddr, addr, len, rw); | |
183 | len_bits = DR_LEN_4; | |
184 | } | |
185 | else | |
186 | return i386_insert_nonaligned_watchpoint (pid, waddr, addr, len, rw); | |
4e326852 | 187 | |
c906108c SS |
188 | free_debug_register = i; |
189 | register_number = free_debug_register - DR_FIRSTADDR; | |
190 | debug_control_mirror |= | |
191 | ((read_write_bits | len_bits) | |
192 | << (DR_CONTROL_SHIFT + DR_CONTROL_SIZE * register_number)); | |
193 | debug_control_mirror |= | |
194 | (1 << (DR_LOCAL_ENABLE_SHIFT + DR_ENABLE_SIZE * register_number)); | |
195 | debug_control_mirror |= DR_LOCAL_SLOWDOWN; | |
196 | debug_control_mirror &= ~DR_CONTROL_RESERVED; | |
4e326852 | 197 | |
c906108c SS |
198 | ptrace (6, pid, offsetof (struct user, u_debugreg[DR_CONTROL]), |
199 | debug_control_mirror); | |
200 | ptrace (6, pid, offsetof (struct user, u_debugreg[free_debug_register]), | |
201 | addr); | |
202 | ||
203 | /* Record where we came from. */ | |
204 | address_lookup[register_number] = addr; | |
205 | return 0; | |
206 | } | |
207 | ||
208 | static int | |
fba45db2 KB |
209 | i386_insert_nonaligned_watchpoint (int pid, CORE_ADDR waddr, CORE_ADDR addr, |
210 | int len, int rw) | |
c906108c SS |
211 | { |
212 | int align; | |
213 | int size; | |
214 | int rv; | |
215 | ||
ceef0e30 | 216 | static int size_try_array[4][4] = |
4e326852 | 217 | { |
ceef0e30 JB |
218 | { 1, 1, 1, 1 }, /* trying size one */ |
219 | { 2, 1, 2, 1 }, /* trying size two */ | |
220 | { 2, 1, 2, 1 }, /* trying size three */ | |
221 | { 4, 1, 2, 1 } /* trying size four */ | |
c906108c SS |
222 | }; |
223 | ||
224 | rv = 0; | |
225 | while (len > 0) | |
226 | { | |
227 | align = addr % 4; | |
228 | /* Four is the maximum length for 386. */ | |
ceef0e30 | 229 | size = size_try_array[len > 4 ? 3 : len - 1][align]; |
c906108c SS |
230 | |
231 | rv = i386_insert_aligned_watchpoint (pid, waddr, addr, size, rw); | |
232 | if (rv) | |
233 | { | |
234 | i386_remove_watchpoint (pid, waddr, size); | |
235 | return rv; | |
236 | } | |
237 | addr += size; | |
238 | len -= size; | |
239 | } | |
240 | return rv; | |
241 | } | |
242 | ||
243 | /* Remove a watchpoint. */ | |
244 | ||
245 | int | |
fba45db2 | 246 | i386_remove_watchpoint (int pid, CORE_ADDR addr, int len) |
c906108c SS |
247 | { |
248 | int i; | |
249 | int register_number; | |
250 | ||
251 | for (i = DR_FIRSTADDR; i <= DR_LASTADDR; i++) | |
252 | { | |
253 | register_number = i - DR_FIRSTADDR; | |
254 | if (address_lookup[register_number] == addr) | |
255 | { | |
256 | debug_control_mirror &= | |
257 | ~(1 << (DR_LOCAL_ENABLE_SHIFT + DR_ENABLE_SIZE * register_number)); | |
258 | address_lookup[register_number] = 0; | |
259 | } | |
260 | } | |
261 | ptrace (6, pid, offsetof (struct user, u_debugreg[DR_CONTROL]), | |
262 | debug_control_mirror); | |
263 | ptrace (6, pid, offsetof (struct user, u_debugreg[DR_STATUS]), 0); | |
264 | ||
265 | return 0; | |
266 | } | |
267 | ||
268 | /* Check if stopped by a watchpoint. */ | |
269 | ||
270 | CORE_ADDR | |
fba45db2 | 271 | i386_stopped_by_watchpoint (int pid) |
c906108c SS |
272 | { |
273 | int i; | |
274 | int status; | |
275 | ||
276 | status = ptrace (3, pid, offsetof (struct user, u_debugreg[DR_STATUS]), 0); | |
277 | ptrace (6, pid, offsetof (struct user, u_debugreg[DR_STATUS]), 0); | |
278 | ||
279 | for (i = DR_FIRSTADDR; i <= DR_LASTADDR; i++) | |
280 | { | |
281 | if (status & (1 << (i - DR_FIRSTADDR))) | |
282 | return address_lookup[i - DR_FIRSTADDR]; | |
283 | } | |
284 | ||
285 | return 0; | |
286 | } | |
287 | ||
288 | #endif /* TARGET_HAS_HARDWARE_WATCHPOINTS */ |