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ebd99d54 | 1 | /* Intel 386 native support for SYSV systems (pre-SVR4). |
6d40175d | 2 | Copyright (C) 1988, 1989, 1991, 1992, 1994 Free Software Foundation, Inc. |
c7c94073 RP |
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., 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
19 | ||
20 | #include "defs.h" | |
21 | #include "frame.h" | |
22 | #include "inferior.h" | |
23 | #include "language.h" | |
24 | #include "gdbcore.h" | |
25 | ||
26 | #ifdef USG | |
27 | #include <sys/types.h> | |
28 | #endif | |
29 | ||
30 | #include <sys/param.h> | |
31 | #include <sys/dir.h> | |
32 | #include <signal.h> | |
33 | #include <sys/user.h> | |
34 | #include <sys/ioctl.h> | |
35 | #include <fcntl.h> | |
36 | ||
6d40175d SS |
37 | #ifdef TARGET_CAN_USE_HARDWARE_WATCHPOINT |
38 | #include <sys/debugreg.h> | |
39 | #endif | |
40 | ||
c7c94073 RP |
41 | #include <sys/file.h> |
42 | #include <sys/stat.h> | |
43 | ||
ebd99d54 | 44 | #ifndef NO_SYS_REG_H |
c7c94073 | 45 | #include <sys/reg.h> |
ebd99d54 FF |
46 | #endif |
47 | ||
eae3f093 | 48 | #include "floatformat.h" |
c7c94073 RP |
49 | |
50 | #include "target.h" | |
51 | ||
c7c94073 RP |
52 | \f |
53 | /* this table must line up with REGISTER_NAMES in tm-i386v.h */ | |
54 | /* symbols like 'EAX' come from <sys/reg.h> */ | |
55 | static int regmap[] = | |
56 | { | |
57 | EAX, ECX, EDX, EBX, | |
58 | UESP, EBP, ESI, EDI, | |
59 | EIP, EFL, CS, SS, | |
60 | DS, ES, FS, GS, | |
61 | }; | |
62 | ||
63 | /* blockend is the value of u.u_ar0, and points to the | |
64 | * place where GS is stored | |
65 | */ | |
66 | ||
67 | int | |
68 | i386_register_u_addr (blockend, regnum) | |
69 | int blockend; | |
70 | int regnum; | |
71 | { | |
72 | #if 0 | |
73 | /* this will be needed if fp registers are reinstated */ | |
74 | /* for now, you can look at them with 'info float' | |
75 | * sys5 wont let you change them with ptrace anyway | |
76 | */ | |
77 | if (regnum >= FP0_REGNUM && regnum <= FP7_REGNUM) | |
78 | { | |
79 | int ubase, fpstate; | |
80 | struct user u; | |
81 | ubase = blockend + 4 * (SS + 1) - KSTKSZ; | |
82 | fpstate = ubase + ((char *)&u.u_fpstate - (char *)&u); | |
83 | return (fpstate + 0x1c + 10 * (regnum - FP0_REGNUM)); | |
84 | } | |
85 | else | |
86 | #endif | |
87 | return (blockend + 4 * regmap[regnum]); | |
88 | ||
89 | } | |
6d40175d SS |
90 | \f |
91 | #ifdef TARGET_CAN_USE_HARDWARE_WATCHPOINT | |
92 | ||
93 | #if !defined (offsetof) | |
94 | #define offsetof(TYPE, MEMBER) ((unsigned long) &((TYPE *)0)->MEMBER) | |
95 | #endif | |
96 | ||
97 | /* Record the value of the debug control register. */ | |
98 | static int debug_control_mirror; | |
99 | ||
100 | /* Record which address associates with which register. */ | |
101 | static CORE_ADDR address_lookup[DR_LASTADDR - DR_FIRSTADDR + 1]; | |
102 | ||
103 | static int | |
04dd69e1 FF |
104 | i386_insert_nonaligned_watchpoint PARAMS ((int, CORE_ADDR, CORE_ADDR, int, |
105 | int)); | |
106 | ||
107 | static int | |
108 | i386_insert_aligned_watchpoint PARAMS ((pid, addr, len, rw)); | |
6d40175d SS |
109 | |
110 | /* Insert a watchpoint. */ | |
111 | ||
112 | int | |
113 | i386_insert_watchpoint (pid, addr, len, rw) | |
114 | int pid; | |
115 | CORE_ADDR addr; | |
116 | int len; | |
117 | int rw; | |
04dd69e1 FF |
118 | { |
119 | return i386_insert_aligned_watchpoint (pid, addr, addr, len, rw); | |
120 | } | |
121 | ||
122 | static int | |
123 | i386_insert_aligned_watchpoint (pid, waddr, addr, len, rw) | |
124 | int pid; | |
125 | CORE_ADDR waddr; | |
126 | CORE_ADDR addr; | |
127 | int len; | |
128 | int rw; | |
6d40175d SS |
129 | { |
130 | int i; | |
131 | int read_write_bits, len_bits; | |
132 | int free_debug_register; | |
133 | int register_number; | |
134 | ||
135 | /* Look for a free debug register. */ | |
136 | for (i = DR_FIRSTADDR; i <= DR_LASTADDR; i++) | |
137 | { | |
138 | if (address_lookup[i - DR_FIRSTADDR] == 0) | |
139 | break; | |
140 | } | |
141 | ||
142 | /* No more debug registers! */ | |
143 | if (i > DR_LASTADDR) | |
144 | return -1; | |
145 | ||
146 | read_write_bits = ((rw & 1) ? DR_RW_READ : 0) | ((rw & 2) ? DR_RW_WRITE : 0); | |
147 | ||
148 | if (len == 1) | |
149 | len_bits = DR_LEN_1; | |
150 | else if (len == 2) | |
151 | { | |
152 | if (addr % 2) | |
04dd69e1 | 153 | return i386_insert_nonaligned_watchpoint (pid, waddr, addr, len, rw); |
6d40175d SS |
154 | len_bits = DR_LEN_2; |
155 | } | |
156 | ||
157 | else if (len == 4) | |
158 | { | |
159 | if (addr % 4) | |
04dd69e1 | 160 | return i386_insert_nonaligned_watchpoint (pid, waddr, addr, len, rw); |
6d40175d SS |
161 | len_bits = DR_LEN_4; |
162 | } | |
163 | else | |
04dd69e1 | 164 | return i386_insert_nonaligned_watchpoint (pid, waddr, addr, len, rw); |
6d40175d SS |
165 | |
166 | free_debug_register = i; | |
167 | register_number = free_debug_register - DR_FIRSTADDR; | |
168 | debug_control_mirror |= | |
169 | ((read_write_bits | len_bits) | |
170 | << (DR_CONTROL_SHIFT + DR_CONTROL_SIZE * register_number)); | |
171 | debug_control_mirror |= | |
172 | (1 << (DR_LOCAL_ENABLE_SHIFT + DR_ENABLE_SIZE * register_number)); | |
173 | debug_control_mirror |= DR_LOCAL_SLOWDOWN; | |
174 | debug_control_mirror &= ~DR_CONTROL_RESERVED; | |
175 | ||
176 | ptrace (6, pid, offsetof (struct user, u_debugreg[DR_CONTROL]), | |
177 | debug_control_mirror); | |
178 | ptrace (6, pid, offsetof (struct user, u_debugreg[free_debug_register]), | |
179 | addr); | |
180 | ||
181 | /* Record where we came from. */ | |
182 | address_lookup[register_number] = addr; | |
183 | return 0; | |
184 | } | |
185 | ||
186 | static int | |
04dd69e1 FF |
187 | i386_insert_nonaligned_watchpoint (pid, waddr, addr, len, rw) |
188 | int pid; | |
189 | CORE_ADDR waddr; | |
190 | CORE_ADDR addr; | |
191 | int len; | |
192 | int rw; | |
6d40175d SS |
193 | { |
194 | int align; | |
195 | int size; | |
196 | int rv; | |
197 | ||
198 | static int size_try_array[16] = { | |
199 | 1, 1, 1, 1, /* trying size one */ | |
200 | 2, 1, 2, 1, /* trying size two */ | |
201 | 2, 1, 2, 1, /* trying size three */ | |
202 | 4, 1, 2, 1 /* trying size four */ | |
203 | }; | |
204 | ||
205 | rv = 0; | |
206 | while (len > 0) | |
207 | { | |
208 | align = addr % 4; | |
209 | /* Four is the maximum length for 386. */ | |
210 | size = (len > 4) ? 3 : len - 1; | |
211 | size = size_try_array[size * 4 + align]; | |
212 | ||
04dd69e1 | 213 | rv = i386_insert_watchpoint (pid, waddr, addr, size, rw); |
6d40175d SS |
214 | if (rv) |
215 | { | |
04dd69e1 | 216 | i386_remove_watchpoint (pid, waddr, size); |
6d40175d SS |
217 | return rv; |
218 | } | |
219 | addr += size; | |
220 | len -= size; | |
221 | } | |
222 | return rv; | |
223 | } | |
224 | ||
225 | /* Remove a watchpoint. */ | |
226 | ||
227 | int | |
228 | i386_remove_watchpoint (pid, addr, len) | |
229 | int pid; | |
230 | CORE_ADDR addr; | |
231 | int len; | |
232 | { | |
233 | int i; | |
234 | int register_number; | |
235 | ||
236 | for (i = DR_FIRSTADDR; i <= DR_LASTADDR; i++) | |
237 | { | |
238 | register_number = i - DR_FIRSTADDR; | |
239 | if (address_lookup[register_number] == addr) | |
240 | { | |
241 | debug_control_mirror &= | |
242 | ~(1 << (DR_LOCAL_ENABLE_SHIFT + DR_ENABLE_SIZE * register_number)); | |
243 | address_lookup[register_number] = 0; | |
244 | } | |
245 | } | |
246 | ptrace (6, pid, offsetof (struct user, u_debugreg[DR_CONTROL]), | |
247 | debug_control_mirror); | |
248 | ptrace (6, pid, offsetof (struct user, u_debugreg[DR_STATUS]), 0); | |
249 | ||
250 | return 0; | |
251 | } | |
252 | ||
253 | /* Check if stopped by a watchpoint. */ | |
254 | ||
255 | CORE_ADDR | |
256 | i386_stopped_by_watchpoint (pid) | |
257 | int pid; | |
258 | { | |
259 | int i; | |
260 | int status; | |
261 | ||
262 | status = ptrace (3, pid, offsetof (struct user, u_debugreg[DR_STATUS]), 0); | |
263 | ptrace (6, pid, offsetof (struct user, u_debugreg[DR_STATUS]), 0); | |
264 | ||
265 | for (i = DR_FIRSTADDR; i <= DR_LASTADDR; i++) | |
266 | { | |
267 | if (status & (1 << (i - DR_FIRSTADDR))) | |
268 | return address_lookup[i - DR_FIRSTADDR]; | |
269 | } | |
270 | ||
271 | return 0; | |
272 | } | |
273 | ||
274 | #endif /* TARGET_CAN_USE_HARDWARE_WATCHPOINT */ | |
c7c94073 RP |
275 | |
276 | #if 0 | |
277 | /* using FLOAT_INFO as is would be a problem. FLOAT_INFO is called | |
278 | via a command xxx and eventually calls ptrace without ever having | |
279 | traversed the target vector. This would be terribly impolite | |
280 | behaviour for a sun4 hosted remote gdb. | |
281 | ||
282 | A fix might be to move this code into the "info registers" command. | |
283 | rich@cygnus.com 15 Sept 92. */ | |
284 | i386_float_info () | |
285 | { | |
286 | struct user u; /* just for address computations */ | |
287 | int i; | |
288 | /* fpstate defined in <sys/user.h> */ | |
289 | struct fpstate *fpstatep; | |
290 | char buf[sizeof (struct fpstate) + 2 * sizeof (int)]; | |
291 | unsigned int uaddr; | |
292 | char fpvalid = 0; | |
293 | unsigned int rounded_addr; | |
294 | unsigned int rounded_size; | |
295 | extern int corechan; | |
296 | int skip; | |
297 | ||
298 | uaddr = (char *)&u.u_fpvalid - (char *)&u; | |
299 | if (target_has_execution) | |
300 | { | |
301 | unsigned int data; | |
302 | unsigned int mask; | |
303 | ||
304 | rounded_addr = uaddr & -sizeof (int); | |
305 | data = ptrace (3, inferior_pid, (PTRACE_ARG3_TYPE) rounded_addr, 0); | |
306 | mask = 0xff << ((uaddr - rounded_addr) * 8); | |
307 | ||
308 | fpvalid = ((data & mask) != 0); | |
309 | } | |
310 | #if 0 | |
311 | else | |
312 | { | |
313 | if (lseek (corechan, uaddr, 0) < 0) | |
314 | perror ("seek on core file"); | |
315 | if (myread (corechan, &fpvalid, 1) < 0) | |
316 | perror ("read on core file"); | |
317 | ||
318 | } | |
319 | #endif /* no core support yet */ | |
320 | ||
321 | if (fpvalid == 0) | |
322 | { | |
199b2450 | 323 | printf_unfiltered ("no floating point status saved\n"); |
c7c94073 RP |
324 | return; |
325 | } | |
326 | ||
327 | uaddr = (char *)&U_FPSTATE(u) - (char *)&u; | |
328 | if (target_has_execution) | |
329 | { | |
330 | int *ip; | |
331 | ||
332 | rounded_addr = uaddr & -sizeof (int); | |
333 | rounded_size = (((uaddr + sizeof (struct fpstate)) - uaddr) + | |
334 | sizeof (int) - 1) / sizeof (int); | |
335 | skip = uaddr - rounded_addr; | |
336 | ||
337 | ip = (int *)buf; | |
338 | for (i = 0; i < rounded_size; i++) | |
339 | { | |
340 | *ip++ = ptrace (3, inferior_pid, (PTRACE_ARG3_TYPE) rounded_addr, 0); | |
341 | rounded_addr += sizeof (int); | |
342 | } | |
343 | } | |
344 | #if 0 | |
345 | else | |
346 | { | |
347 | if (lseek (corechan, uaddr, 0) < 0) | |
348 | perror_with_name ("seek on core file"); | |
349 | if (myread (corechan, buf, sizeof (struct fpstate)) < 0) | |
350 | perror_with_name ("read from core file"); | |
351 | skip = 0; | |
352 | } | |
3496b745 | 353 | #endif /* 0 */ |
c7c94073 RP |
354 | |
355 | fpstatep = (struct fpstate *)(buf + skip); | |
356 | print_387_status (fpstatep->status, (struct env387 *)fpstatep->state); | |
357 | } | |
358 | ||
359 | #endif /* never */ |