Commit | Line | Data |
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bd5635a1 | 1 | /* Low level Unix child interface to ptrace, for GDB when running under Unix. |
ee0613d1 | 2 | Copyright 1988, 1989, 1990, 1991, 1992 Free Software Foundation, Inc. |
bd5635a1 RP |
3 | |
4 | This file is part of GDB. | |
5 | ||
b6de2014 | 6 | This program is free software; you can redistribute it and/or modify |
bd5635a1 | 7 | it under the terms of the GNU General Public License as published by |
b6de2014 JG |
8 | the Free Software Foundation; either version 2 of the License, or |
9 | (at your option) any later version. | |
bd5635a1 | 10 | |
b6de2014 | 11 | This program is distributed in the hope that it will be useful, |
bd5635a1 RP |
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 | |
b6de2014 JG |
17 | along with this program; if not, write to the Free Software |
18 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
bd5635a1 | 19 | |
bd5635a1 | 20 | #include "defs.h" |
bd5635a1 RP |
21 | #include "frame.h" |
22 | #include "inferior.h" | |
23 | #include "target.h" | |
24 | ||
25 | #ifdef USG | |
26 | #include <sys/types.h> | |
27 | #endif | |
28 | ||
29 | #include <sys/param.h> | |
30 | #include <sys/dir.h> | |
31 | #include <signal.h> | |
32 | #include <sys/ioctl.h> | |
8ffd75c8 | 33 | #ifndef USG |
a0f9783e SG |
34 | #ifdef PTRACE_IN_WRONG_PLACE |
35 | #include <ptrace.h> | |
36 | #else | |
bd5635a1 | 37 | #include <sys/ptrace.h> |
8ffd75c8 | 38 | #endif |
a0f9783e | 39 | #endif |
8ffd75c8 | 40 | |
bd5635a1 RP |
41 | #if !defined (PT_KILL) |
42 | #define PT_KILL 8 | |
43 | #define PT_STEP 9 | |
44 | #define PT_CONTINUE 7 | |
45 | #define PT_READ_U 3 | |
46 | #define PT_WRITE_U 6 | |
47 | #define PT_READ_I 1 | |
8ffd75c8 | 48 | #define PT_READ_D 2 |
bd5635a1 | 49 | #define PT_WRITE_I 4 |
8ffd75c8 | 50 | #define PT_WRITE_D 5 |
bd5635a1 RP |
51 | #endif /* No PT_KILL. */ |
52 | ||
53 | #ifndef PT_ATTACH | |
54 | #define PT_ATTACH PTRACE_ATTACH | |
55 | #endif | |
56 | #ifndef PT_DETACH | |
57 | #define PT_DETACH PTRACE_DETACH | |
58 | #endif | |
59 | ||
60 | #include "gdbcore.h" | |
ee0613d1 | 61 | #ifndef NO_SYS_FILE |
bd5635a1 | 62 | #include <sys/file.h> |
ee0613d1 | 63 | #endif |
bd5635a1 | 64 | #include <sys/stat.h> |
44ff4c96 JG |
65 | |
66 | #if !defined (FETCH_INFERIOR_REGISTERS) | |
67 | #include <sys/user.h> /* Probably need to poke the user structure */ | |
68 | #if defined (KERNEL_U_ADDR_BSD) | |
69 | #include <a.out.h> /* For struct nlist */ | |
70 | #endif /* KERNEL_U_ADDR_BSD. */ | |
71 | #endif /* !FETCH_INFERIOR_REGISTERS */ | |
e676a15f | 72 | |
bd5635a1 RP |
73 | \f |
74 | /* This function simply calls ptrace with the given arguments. | |
75 | It exists so that all calls to ptrace are isolated in this | |
76 | machine-dependent file. */ | |
77 | int | |
78 | call_ptrace (request, pid, addr, data) | |
e676a15f FF |
79 | int request, pid; |
80 | PTRACE_ARG3_TYPE addr; | |
81 | int data; | |
bd5635a1 RP |
82 | { |
83 | return ptrace (request, pid, addr, data); | |
84 | } | |
85 | ||
86 | #ifdef DEBUG_PTRACE | |
87 | /* For the rest of the file, use an extra level of indirection */ | |
88 | /* This lets us breakpoint usefully on call_ptrace. */ | |
89 | #define ptrace call_ptrace | |
90 | #endif | |
91 | ||
92 | /* This is used when GDB is exiting. It gives less chance of error.*/ | |
93 | ||
94 | void | |
95 | kill_inferior_fast () | |
96 | { | |
97 | if (inferior_pid == 0) | |
98 | return; | |
e676a15f | 99 | ptrace (PT_KILL, inferior_pid, (PTRACE_ARG3_TYPE) 0, 0); |
bd5635a1 RP |
100 | wait ((int *)0); |
101 | } | |
102 | ||
103 | void | |
ee0613d1 | 104 | kill_inferior () |
bd5635a1 RP |
105 | { |
106 | kill_inferior_fast (); | |
107 | target_mourn_inferior (); | |
108 | } | |
109 | ||
110 | /* Resume execution of the inferior process. | |
111 | If STEP is nonzero, single-step it. | |
112 | If SIGNAL is nonzero, give it that signal. */ | |
113 | ||
114 | void | |
115 | child_resume (step, signal) | |
116 | int step; | |
117 | int signal; | |
118 | { | |
119 | errno = 0; | |
d11c44f1 | 120 | |
e676a15f FF |
121 | /* An address of (PTRACE_ARG3_TYPE)1 tells ptrace to continue from where |
122 | it was. (If GDB wanted it to start some other way, we have already | |
123 | written a new PC value to the child.) */ | |
d11c44f1 | 124 | |
bd5635a1 | 125 | if (step) |
e676a15f FF |
126 | #ifdef NO_SINGLE_STEP |
127 | single_step (signal); | |
128 | #else | |
129 | ptrace (PT_STEP, inferior_pid, (PTRACE_ARG3_TYPE) 1, signal); | |
130 | #endif | |
bd5635a1 | 131 | else |
e676a15f FF |
132 | #ifdef AIX_BUGGY_PTRACE_CONTINUE |
133 | AIX_BUGGY_PTRACE_CONTINUE; | |
134 | #else | |
135 | ptrace (PT_CONTINUE, inferior_pid, (PTRACE_ARG3_TYPE) 1, signal); | |
136 | #endif | |
d11c44f1 | 137 | |
bd5635a1 RP |
138 | if (errno) |
139 | perror_with_name ("ptrace"); | |
140 | } | |
141 | \f | |
142 | #ifdef ATTACH_DETACH | |
143 | /* Nonzero if we are debugging an attached process rather than | |
144 | an inferior. */ | |
145 | extern int attach_flag; | |
146 | ||
147 | /* Start debugging the process whose number is PID. */ | |
148 | int | |
149 | attach (pid) | |
150 | int pid; | |
151 | { | |
152 | errno = 0; | |
e676a15f | 153 | ptrace (PT_ATTACH, pid, (PTRACE_ARG3_TYPE) 0, 0); |
bd5635a1 RP |
154 | if (errno) |
155 | perror_with_name ("ptrace"); | |
156 | attach_flag = 1; | |
157 | return pid; | |
158 | } | |
159 | ||
160 | /* Stop debugging the process whose number is PID | |
161 | and continue it with signal number SIGNAL. | |
162 | SIGNAL = 0 means just continue it. */ | |
163 | ||
164 | void | |
165 | detach (signal) | |
166 | int signal; | |
167 | { | |
168 | errno = 0; | |
e676a15f | 169 | ptrace (PT_DETACH, inferior_pid, (PTRACE_ARG3_TYPE) 1, signal); |
bd5635a1 RP |
170 | if (errno) |
171 | perror_with_name ("ptrace"); | |
172 | attach_flag = 0; | |
173 | } | |
174 | #endif /* ATTACH_DETACH */ | |
175 | \f | |
176 | #if !defined (FETCH_INFERIOR_REGISTERS) | |
177 | ||
178 | /* KERNEL_U_ADDR is the amount to subtract from u.u_ar0 | |
179 | to get the offset in the core file of the register values. */ | |
180 | #if defined (KERNEL_U_ADDR_BSD) | |
181 | /* Get kernel_u_addr using BSD-style nlist(). */ | |
182 | CORE_ADDR kernel_u_addr; | |
183 | ||
184 | void | |
185 | _initialize_kernel_u_addr () | |
186 | { | |
187 | struct nlist names[2]; | |
188 | ||
189 | names[0].n_un.n_name = "_u"; | |
190 | names[1].n_un.n_name = NULL; | |
191 | if (nlist ("/vmunix", names) == 0) | |
192 | kernel_u_addr = names[0].n_value; | |
193 | else | |
194 | fatal ("Unable to get kernel u area address."); | |
195 | } | |
196 | #endif /* KERNEL_U_ADDR_BSD. */ | |
197 | ||
198 | #if defined (KERNEL_U_ADDR_HPUX) | |
199 | /* Get kernel_u_addr using HPUX-style nlist(). */ | |
200 | CORE_ADDR kernel_u_addr; | |
201 | ||
202 | struct hpnlist { | |
203 | char * n_name; | |
204 | long n_value; | |
205 | unsigned char n_type; | |
206 | unsigned char n_length; | |
207 | short n_almod; | |
208 | short n_unused; | |
209 | }; | |
210 | static struct hpnlist nl[] = {{ "_u", -1, }, { (char *) 0, }}; | |
211 | ||
212 | /* read the value of the u area from the hp-ux kernel */ | |
213 | void _initialize_kernel_u_addr () | |
214 | { | |
bd5635a1 RP |
215 | nlist ("/hp-ux", &nl); |
216 | kernel_u_addr = nl[0].n_value; | |
217 | } | |
218 | #endif /* KERNEL_U_ADDR_HPUX. */ | |
219 | ||
220 | #if !defined (offsetof) | |
221 | #define offsetof(TYPE, MEMBER) ((unsigned long) &((TYPE *)0)->MEMBER) | |
222 | #endif | |
223 | ||
224 | /* U_REGS_OFFSET is the offset of the registers within the u area. */ | |
225 | #if !defined (U_REGS_OFFSET) | |
226 | #define U_REGS_OFFSET \ | |
227 | ptrace (PT_READ_U, inferior_pid, \ | |
e676a15f FF |
228 | (PTRACE_ARG3_TYPE) (offsetof (struct user, u_ar0)), 0) \ |
229 | - KERNEL_U_ADDR | |
bd5635a1 RP |
230 | #endif |
231 | ||
44ff4c96 JG |
232 | /* Registers we shouldn't try to fetch. */ |
233 | #if !defined (CANNOT_FETCH_REGISTER) | |
234 | #define CANNOT_FETCH_REGISTER(regno) 0 | |
235 | #endif | |
236 | ||
bd5635a1 | 237 | /* Fetch one register. */ |
44ff4c96 | 238 | |
bd5635a1 RP |
239 | static void |
240 | fetch_register (regno) | |
241 | int regno; | |
242 | { | |
243 | register unsigned int regaddr; | |
244 | char buf[MAX_REGISTER_RAW_SIZE]; | |
44ff4c96 | 245 | char mess[128]; /* For messages */ |
bd5635a1 RP |
246 | register int i; |
247 | ||
248 | /* Offset of registers within the u area. */ | |
44ff4c96 JG |
249 | unsigned int offset; |
250 | ||
251 | if (CANNOT_FETCH_REGISTER (regno)) | |
252 | { | |
253 | bzero (buf, REGISTER_RAW_SIZE (regno)); /* Supply zeroes */ | |
254 | supply_register (regno, buf); | |
255 | return; | |
256 | } | |
257 | ||
258 | offset = U_REGS_OFFSET; | |
bd5635a1 RP |
259 | |
260 | regaddr = register_addr (regno, offset); | |
261 | for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (int)) | |
262 | { | |
44ff4c96 | 263 | errno = 0; |
e676a15f FF |
264 | *(int *) &buf[i] = ptrace (PT_READ_U, inferior_pid, |
265 | (PTRACE_ARG3_TYPE) regaddr, 0); | |
bd5635a1 | 266 | regaddr += sizeof (int); |
44ff4c96 JG |
267 | if (errno != 0) |
268 | { | |
269 | sprintf (mess, "reading register %s (#%d)", reg_names[regno], regno); | |
270 | perror_with_name (mess); | |
271 | } | |
bd5635a1 RP |
272 | } |
273 | supply_register (regno, buf); | |
274 | } | |
275 | ||
44ff4c96 | 276 | |
5594d534 | 277 | /* Fetch all registers, or just one, from the child process. */ |
bd5635a1 | 278 | |
5594d534 | 279 | void |
bd5635a1 RP |
280 | fetch_inferior_registers (regno) |
281 | int regno; | |
282 | { | |
283 | if (regno == -1) | |
284 | for (regno = 0; regno < NUM_REGS; regno++) | |
285 | fetch_register (regno); | |
286 | else | |
287 | fetch_register (regno); | |
bd5635a1 RP |
288 | } |
289 | ||
290 | /* Registers we shouldn't try to store. */ | |
291 | #if !defined (CANNOT_STORE_REGISTER) | |
292 | #define CANNOT_STORE_REGISTER(regno) 0 | |
293 | #endif | |
294 | ||
295 | /* Store our register values back into the inferior. | |
296 | If REGNO is -1, do this for all registers. | |
297 | Otherwise, REGNO specifies which register (so we can save time). */ | |
298 | ||
e676a15f | 299 | void |
bd5635a1 RP |
300 | store_inferior_registers (regno) |
301 | int regno; | |
302 | { | |
303 | register unsigned int regaddr; | |
304 | char buf[80]; | |
305 | extern char registers[]; | |
306 | register int i; | |
bd5635a1 RP |
307 | |
308 | unsigned int offset = U_REGS_OFFSET; | |
309 | ||
310 | if (regno >= 0) | |
311 | { | |
312 | regaddr = register_addr (regno, offset); | |
313 | for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof(int)) | |
314 | { | |
315 | errno = 0; | |
e676a15f | 316 | ptrace (PT_WRITE_U, inferior_pid, (PTRACE_ARG3_TYPE) regaddr, |
bd5635a1 RP |
317 | *(int *) ®isters[REGISTER_BYTE (regno) + i]); |
318 | if (errno != 0) | |
319 | { | |
320 | sprintf (buf, "writing register number %d(%d)", regno, i); | |
321 | perror_with_name (buf); | |
bd5635a1 RP |
322 | } |
323 | regaddr += sizeof(int); | |
324 | } | |
325 | } | |
326 | else | |
327 | { | |
328 | for (regno = 0; regno < NUM_REGS; regno++) | |
329 | { | |
330 | if (CANNOT_STORE_REGISTER (regno)) | |
331 | continue; | |
332 | regaddr = register_addr (regno, offset); | |
333 | for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof(int)) | |
334 | { | |
335 | errno = 0; | |
e676a15f | 336 | ptrace (PT_WRITE_U, inferior_pid, (PTRACE_ARG3_TYPE) regaddr, |
bd5635a1 RP |
337 | *(int *) ®isters[REGISTER_BYTE (regno) + i]); |
338 | if (errno != 0) | |
339 | { | |
340 | sprintf (buf, "writing register number %d(%d)", regno, i); | |
341 | perror_with_name (buf); | |
bd5635a1 RP |
342 | } |
343 | regaddr += sizeof(int); | |
344 | } | |
345 | } | |
346 | } | |
bd5635a1 RP |
347 | } |
348 | #endif /* !defined (FETCH_INFERIOR_REGISTERS). */ | |
349 | \f | |
350 | /* NOTE! I tried using PTRACE_READDATA, etc., to read and write memory | |
351 | in the NEW_SUN_PTRACE case. | |
352 | It ought to be straightforward. But it appears that writing did | |
353 | not write the data that I specified. I cannot understand where | |
354 | it got the data that it actually did write. */ | |
355 | ||
356 | /* Copy LEN bytes to or from inferior's memory starting at MEMADDR | |
357 | to debugger memory starting at MYADDR. Copy to inferior if | |
358 | WRITE is nonzero. | |
359 | ||
360 | Returns the length copied, which is either the LEN argument or zero. | |
361 | This xfer function does not do partial moves, since child_ops | |
362 | doesn't allow memory operations to cross below us in the target stack | |
363 | anyway. */ | |
364 | ||
365 | int | |
b6de2014 | 366 | child_xfer_memory (memaddr, myaddr, len, write, target) |
bd5635a1 RP |
367 | CORE_ADDR memaddr; |
368 | char *myaddr; | |
369 | int len; | |
370 | int write; | |
ee0613d1 | 371 | struct target_ops *target; /* ignored */ |
bd5635a1 RP |
372 | { |
373 | register int i; | |
374 | /* Round starting address down to longword boundary. */ | |
375 | register CORE_ADDR addr = memaddr & - sizeof (int); | |
376 | /* Round ending address up; get number of longwords that makes. */ | |
377 | register int count | |
378 | = (((memaddr + len) - addr) + sizeof (int) - 1) / sizeof (int); | |
379 | /* Allocate buffer of that many longwords. */ | |
380 | register int *buffer = (int *) alloca (count * sizeof (int)); | |
381 | ||
382 | if (write) | |
383 | { | |
384 | /* Fill start and end extra bytes of buffer with existing memory data. */ | |
385 | ||
386 | if (addr != memaddr || len < (int)sizeof (int)) { | |
387 | /* Need part of initial word -- fetch it. */ | |
e676a15f FF |
388 | buffer[0] = ptrace (PT_READ_I, inferior_pid, (PTRACE_ARG3_TYPE) addr, |
389 | 0); | |
bd5635a1 RP |
390 | } |
391 | ||
392 | if (count > 1) /* FIXME, avoid if even boundary */ | |
393 | { | |
394 | buffer[count - 1] | |
395 | = ptrace (PT_READ_I, inferior_pid, | |
e676a15f FF |
396 | (PTRACE_ARG3_TYPE) (addr + (count - 1) * sizeof (int)), |
397 | 0); | |
bd5635a1 RP |
398 | } |
399 | ||
400 | /* Copy data to be written over corresponding part of buffer */ | |
401 | ||
a0f9783e | 402 | memcpy ((char *) buffer + (memaddr & (sizeof (int) - 1)), myaddr, len); |
bd5635a1 RP |
403 | |
404 | /* Write the entire buffer. */ | |
405 | ||
406 | for (i = 0; i < count; i++, addr += sizeof (int)) | |
407 | { | |
408 | errno = 0; | |
e676a15f FF |
409 | ptrace (PT_WRITE_D, inferior_pid, (PTRACE_ARG3_TYPE) addr, |
410 | buffer[i]); | |
bd5635a1 RP |
411 | if (errno) |
412 | { | |
413 | /* Using the appropriate one (I or D) is necessary for | |
414 | Gould NP1, at least. */ | |
415 | errno = 0; | |
e676a15f FF |
416 | ptrace (PT_WRITE_I, inferior_pid, (PTRACE_ARG3_TYPE) addr, |
417 | buffer[i]); | |
bd5635a1 RP |
418 | } |
419 | if (errno) | |
420 | return 0; | |
421 | } | |
422 | } | |
423 | else | |
424 | { | |
425 | /* Read all the longwords */ | |
426 | for (i = 0; i < count; i++, addr += sizeof (int)) | |
427 | { | |
428 | errno = 0; | |
e676a15f FF |
429 | buffer[i] = ptrace (PT_READ_I, inferior_pid, |
430 | (PTRACE_ARG3_TYPE) addr, 0); | |
bd5635a1 RP |
431 | if (errno) |
432 | return 0; | |
433 | QUIT; | |
434 | } | |
435 | ||
436 | /* Copy appropriate bytes out of the buffer. */ | |
a0f9783e | 437 | memcpy (myaddr, (char *) buffer + (memaddr & (sizeof (int) - 1)), len); |
bd5635a1 RP |
438 | } |
439 | return len; | |
440 | } |