Commit | Line | Data |
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ebd99d54 | 1 | /* Intel 386 native support for SYSV systems (pre-SVR4). |
7531f36e | 2 | Copyright (C) 1988, 1989, 1991, 1992, 1994, 1996 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 | |
6c9638b4 | 18 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ |
c7c94073 RP |
19 | |
20 | #include "defs.h" | |
4ff3dfab JM |
21 | |
22 | #ifdef HAVE_PTRACE_H | |
23 | # include <ptrace.h> | |
24 | #else | |
25 | # ifdef HAVE_SYS_PTRACE_H | |
26 | # include <sys/ptrace.h> | |
27 | # endif | |
28 | #endif | |
29 | ||
c7c94073 RP |
30 | #include "frame.h" |
31 | #include "inferior.h" | |
32 | #include "language.h" | |
33 | #include "gdbcore.h" | |
34 | ||
35 | #ifdef USG | |
36 | #include <sys/types.h> | |
37 | #endif | |
38 | ||
39 | #include <sys/param.h> | |
40 | #include <sys/dir.h> | |
41 | #include <signal.h> | |
42 | #include <sys/user.h> | |
43 | #include <sys/ioctl.h> | |
44 | #include <fcntl.h> | |
45 | ||
f5a8f1a6 | 46 | #ifdef TARGET_HAS_HARDWARE_WATCHPOINTS |
6d40175d SS |
47 | #include <sys/debugreg.h> |
48 | #endif | |
49 | ||
c7c94073 | 50 | #include <sys/file.h> |
2b576293 | 51 | #include "gdb_stat.h" |
c7c94073 | 52 | |
4ff3dfab | 53 | #ifdef HAVE_SYS_REG_H |
c7c94073 | 54 | #include <sys/reg.h> |
ebd99d54 FF |
55 | #endif |
56 | ||
eae3f093 | 57 | #include "floatformat.h" |
c7c94073 RP |
58 | |
59 | #include "target.h" | |
60 | ||
c7c94073 RP |
61 | \f |
62 | /* this table must line up with REGISTER_NAMES in tm-i386v.h */ | |
63 | /* symbols like 'EAX' come from <sys/reg.h> */ | |
64 | static int regmap[] = | |
65 | { | |
66 | EAX, ECX, EDX, EBX, | |
67 | UESP, EBP, ESI, EDI, | |
68 | EIP, EFL, CS, SS, | |
69 | DS, ES, FS, GS, | |
70 | }; | |
71 | ||
72 | /* blockend is the value of u.u_ar0, and points to the | |
73 | * place where GS is stored | |
74 | */ | |
75 | ||
76 | int | |
77 | i386_register_u_addr (blockend, regnum) | |
78 | int blockend; | |
79 | int regnum; | |
80 | { | |
183e1f0d FF |
81 | struct user u; |
82 | int fpstate; | |
83 | int ubase; | |
84 | ||
85 | ubase = blockend; | |
86 | /* FIXME: Should have better way to test floating point range */ | |
87 | if (regnum >= FP0_REGNUM && regnum <= (FP0_REGNUM + 7)) | |
c7c94073 | 88 | { |
183e1f0d FF |
89 | #ifdef KSTKSZ /* SCO, and others? */ |
90 | ubase += 4 * (SS + 1) - KSTKSZ; | |
91 | fpstate = ubase + ((char *)&u.u_fps.u_fpstate - (char *)&u); | |
c7c94073 | 92 | return (fpstate + 0x1c + 10 * (regnum - FP0_REGNUM)); |
183e1f0d FF |
93 | #else |
94 | fpstate = ubase + ((char *)&u.i387.st_space - (char *)&u); | |
95 | return (fpstate + 10 * (regnum - FP0_REGNUM)); | |
96 | #endif | |
c7c94073 RP |
97 | } |
98 | else | |
183e1f0d FF |
99 | { |
100 | return (ubase + 4 * regmap[regnum]); | |
101 | } | |
c7c94073 RP |
102 | |
103 | } | |
6d40175d | 104 | \f |
7531f36e FF |
105 | int |
106 | kernel_u_size () | |
107 | { | |
108 | return (sizeof (struct user)); | |
109 | } | |
110 | \f | |
f5a8f1a6 | 111 | #ifdef TARGET_HAS_HARDWARE_WATCHPOINTS |
6d40175d SS |
112 | |
113 | #if !defined (offsetof) | |
114 | #define offsetof(TYPE, MEMBER) ((unsigned long) &((TYPE *)0)->MEMBER) | |
115 | #endif | |
116 | ||
117 | /* Record the value of the debug control register. */ | |
118 | static int debug_control_mirror; | |
119 | ||
120 | /* Record which address associates with which register. */ | |
121 | static CORE_ADDR address_lookup[DR_LASTADDR - DR_FIRSTADDR + 1]; | |
122 | ||
123 | static int | |
95618211 | 124 | i386_insert_aligned_watchpoint PARAMS ((int, CORE_ADDR, CORE_ADDR, int, |
04dd69e1 FF |
125 | int)); |
126 | ||
127 | static int | |
95618211 SS |
128 | i386_insert_nonaligned_watchpoint PARAMS ((int, CORE_ADDR, CORE_ADDR, int, |
129 | int)); | |
6d40175d SS |
130 | |
131 | /* Insert a watchpoint. */ | |
132 | ||
133 | int | |
134 | i386_insert_watchpoint (pid, addr, len, rw) | |
135 | int pid; | |
136 | CORE_ADDR addr; | |
137 | int len; | |
138 | int rw; | |
04dd69e1 FF |
139 | { |
140 | return i386_insert_aligned_watchpoint (pid, addr, addr, len, rw); | |
141 | } | |
142 | ||
143 | static int | |
144 | i386_insert_aligned_watchpoint (pid, waddr, addr, len, rw) | |
145 | int pid; | |
146 | CORE_ADDR waddr; | |
147 | CORE_ADDR addr; | |
148 | int len; | |
149 | int rw; | |
6d40175d SS |
150 | { |
151 | int i; | |
152 | int read_write_bits, len_bits; | |
153 | int free_debug_register; | |
154 | int register_number; | |
155 | ||
156 | /* Look for a free debug register. */ | |
157 | for (i = DR_FIRSTADDR; i <= DR_LASTADDR; i++) | |
158 | { | |
159 | if (address_lookup[i - DR_FIRSTADDR] == 0) | |
160 | break; | |
161 | } | |
162 | ||
163 | /* No more debug registers! */ | |
164 | if (i > DR_LASTADDR) | |
165 | return -1; | |
166 | ||
1e50f1b4 | 167 | read_write_bits = (rw & 1) ? DR_RW_READ : DR_RW_WRITE; |
6d40175d SS |
168 | |
169 | if (len == 1) | |
170 | len_bits = DR_LEN_1; | |
171 | else if (len == 2) | |
172 | { | |
173 | if (addr % 2) | |
04dd69e1 | 174 | return i386_insert_nonaligned_watchpoint (pid, waddr, addr, len, rw); |
6d40175d SS |
175 | len_bits = DR_LEN_2; |
176 | } | |
177 | ||
178 | else if (len == 4) | |
179 | { | |
180 | if (addr % 4) | |
04dd69e1 | 181 | return i386_insert_nonaligned_watchpoint (pid, waddr, addr, len, rw); |
6d40175d SS |
182 | len_bits = DR_LEN_4; |
183 | } | |
184 | else | |
04dd69e1 | 185 | return i386_insert_nonaligned_watchpoint (pid, waddr, addr, len, rw); |
6d40175d SS |
186 | |
187 | free_debug_register = i; | |
188 | register_number = free_debug_register - DR_FIRSTADDR; | |
189 | debug_control_mirror |= | |
190 | ((read_write_bits | len_bits) | |
191 | << (DR_CONTROL_SHIFT + DR_CONTROL_SIZE * register_number)); | |
192 | debug_control_mirror |= | |
193 | (1 << (DR_LOCAL_ENABLE_SHIFT + DR_ENABLE_SIZE * register_number)); | |
194 | debug_control_mirror |= DR_LOCAL_SLOWDOWN; | |
195 | debug_control_mirror &= ~DR_CONTROL_RESERVED; | |
196 | ||
197 | ptrace (6, pid, offsetof (struct user, u_debugreg[DR_CONTROL]), | |
198 | debug_control_mirror); | |
199 | ptrace (6, pid, offsetof (struct user, u_debugreg[free_debug_register]), | |
200 | addr); | |
201 | ||
202 | /* Record where we came from. */ | |
203 | address_lookup[register_number] = addr; | |
204 | return 0; | |
205 | } | |
206 | ||
207 | static int | |
04dd69e1 FF |
208 | i386_insert_nonaligned_watchpoint (pid, waddr, addr, len, rw) |
209 | int pid; | |
210 | CORE_ADDR waddr; | |
211 | CORE_ADDR addr; | |
212 | int len; | |
213 | int rw; | |
6d40175d SS |
214 | { |
215 | int align; | |
216 | int size; | |
217 | int rv; | |
218 | ||
219 | static int size_try_array[16] = { | |
220 | 1, 1, 1, 1, /* trying size one */ | |
221 | 2, 1, 2, 1, /* trying size two */ | |
222 | 2, 1, 2, 1, /* trying size three */ | |
223 | 4, 1, 2, 1 /* trying size four */ | |
224 | }; | |
225 | ||
226 | rv = 0; | |
227 | while (len > 0) | |
228 | { | |
229 | align = addr % 4; | |
230 | /* Four is the maximum length for 386. */ | |
231 | size = (len > 4) ? 3 : len - 1; | |
232 | size = size_try_array[size * 4 + align]; | |
233 | ||
95618211 | 234 | rv = i386_insert_aligned_watchpoint (pid, waddr, addr, size, rw); |
6d40175d SS |
235 | if (rv) |
236 | { | |
04dd69e1 | 237 | i386_remove_watchpoint (pid, waddr, size); |
6d40175d SS |
238 | return rv; |
239 | } | |
240 | addr += size; | |
241 | len -= size; | |
242 | } | |
243 | return rv; | |
244 | } | |
245 | ||
246 | /* Remove a watchpoint. */ | |
247 | ||
248 | int | |
249 | i386_remove_watchpoint (pid, addr, len) | |
250 | int pid; | |
251 | CORE_ADDR addr; | |
252 | int len; | |
253 | { | |
254 | int i; | |
255 | int register_number; | |
256 | ||
257 | for (i = DR_FIRSTADDR; i <= DR_LASTADDR; i++) | |
258 | { | |
259 | register_number = i - DR_FIRSTADDR; | |
260 | if (address_lookup[register_number] == addr) | |
261 | { | |
262 | debug_control_mirror &= | |
263 | ~(1 << (DR_LOCAL_ENABLE_SHIFT + DR_ENABLE_SIZE * register_number)); | |
264 | address_lookup[register_number] = 0; | |
265 | } | |
266 | } | |
267 | ptrace (6, pid, offsetof (struct user, u_debugreg[DR_CONTROL]), | |
268 | debug_control_mirror); | |
269 | ptrace (6, pid, offsetof (struct user, u_debugreg[DR_STATUS]), 0); | |
270 | ||
271 | return 0; | |
272 | } | |
273 | ||
274 | /* Check if stopped by a watchpoint. */ | |
275 | ||
276 | CORE_ADDR | |
277 | i386_stopped_by_watchpoint (pid) | |
278 | int pid; | |
279 | { | |
280 | int i; | |
281 | int status; | |
282 | ||
283 | status = ptrace (3, pid, offsetof (struct user, u_debugreg[DR_STATUS]), 0); | |
284 | ptrace (6, pid, offsetof (struct user, u_debugreg[DR_STATUS]), 0); | |
285 | ||
286 | for (i = DR_FIRSTADDR; i <= DR_LASTADDR; i++) | |
287 | { | |
288 | if (status & (1 << (i - DR_FIRSTADDR))) | |
289 | return address_lookup[i - DR_FIRSTADDR]; | |
290 | } | |
291 | ||
292 | return 0; | |
293 | } | |
294 | ||
f5a8f1a6 | 295 | #endif /* TARGET_HAS_HARDWARE_WATCHPOINTS */ |
c7c94073 RP |
296 | |
297 | #if 0 | |
298 | /* using FLOAT_INFO as is would be a problem. FLOAT_INFO is called | |
299 | via a command xxx and eventually calls ptrace without ever having | |
300 | traversed the target vector. This would be terribly impolite | |
301 | behaviour for a sun4 hosted remote gdb. | |
302 | ||
303 | A fix might be to move this code into the "info registers" command. | |
304 | rich@cygnus.com 15 Sept 92. */ | |
305 | i386_float_info () | |
306 | { | |
307 | struct user u; /* just for address computations */ | |
308 | int i; | |
309 | /* fpstate defined in <sys/user.h> */ | |
310 | struct fpstate *fpstatep; | |
311 | char buf[sizeof (struct fpstate) + 2 * sizeof (int)]; | |
312 | unsigned int uaddr; | |
313 | char fpvalid = 0; | |
314 | unsigned int rounded_addr; | |
315 | unsigned int rounded_size; | |
316 | extern int corechan; | |
317 | int skip; | |
318 | ||
319 | uaddr = (char *)&u.u_fpvalid - (char *)&u; | |
320 | if (target_has_execution) | |
321 | { | |
322 | unsigned int data; | |
323 | unsigned int mask; | |
324 | ||
325 | rounded_addr = uaddr & -sizeof (int); | |
326 | data = ptrace (3, inferior_pid, (PTRACE_ARG3_TYPE) rounded_addr, 0); | |
327 | mask = 0xff << ((uaddr - rounded_addr) * 8); | |
328 | ||
329 | fpvalid = ((data & mask) != 0); | |
330 | } | |
331 | #if 0 | |
332 | else | |
333 | { | |
334 | if (lseek (corechan, uaddr, 0) < 0) | |
335 | perror ("seek on core file"); | |
336 | if (myread (corechan, &fpvalid, 1) < 0) | |
337 | perror ("read on core file"); | |
338 | ||
339 | } | |
340 | #endif /* no core support yet */ | |
341 | ||
342 | if (fpvalid == 0) | |
343 | { | |
199b2450 | 344 | printf_unfiltered ("no floating point status saved\n"); |
c7c94073 RP |
345 | return; |
346 | } | |
347 | ||
348 | uaddr = (char *)&U_FPSTATE(u) - (char *)&u; | |
349 | if (target_has_execution) | |
350 | { | |
351 | int *ip; | |
352 | ||
353 | rounded_addr = uaddr & -sizeof (int); | |
354 | rounded_size = (((uaddr + sizeof (struct fpstate)) - uaddr) + | |
355 | sizeof (int) - 1) / sizeof (int); | |
356 | skip = uaddr - rounded_addr; | |
357 | ||
358 | ip = (int *)buf; | |
359 | for (i = 0; i < rounded_size; i++) | |
360 | { | |
361 | *ip++ = ptrace (3, inferior_pid, (PTRACE_ARG3_TYPE) rounded_addr, 0); | |
362 | rounded_addr += sizeof (int); | |
363 | } | |
364 | } | |
365 | #if 0 | |
366 | else | |
367 | { | |
368 | if (lseek (corechan, uaddr, 0) < 0) | |
369 | perror_with_name ("seek on core file"); | |
370 | if (myread (corechan, buf, sizeof (struct fpstate)) < 0) | |
371 | perror_with_name ("read from core file"); | |
372 | skip = 0; | |
373 | } | |
3496b745 | 374 | #endif /* 0 */ |
c7c94073 RP |
375 | |
376 | fpstatep = (struct fpstate *)(buf + skip); | |
377 | print_387_status (fpstatep->status, (struct env387 *)fpstatep->state); | |
378 | } | |
379 | ||
380 | #endif /* never */ |