Commit | Line | Data |
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7da1e27d SG |
1 | /* Machine-dependent code which would otherwise be in infptrace.c, |
2 | for GDB, the GNU debugger. This code is for the HP PA-RISC cpu. | |
5140562f | 3 | Copyright 1986, 1987, 1989, 1990, 1991, 1992 Free Software Foundation, Inc. |
7da1e27d SG |
4 | |
5 | Contributed by the Center for Software Science at the | |
6 | University of Utah (pa-gdb-bugs@cs.utah.edu). | |
7 | ||
8 | /* Low level Unix child interface to ptrace, for GDB when running under Unix. | |
9 | Copyright (C) 1988, 1989, 1990, 1991 Free Software Foundation, Inc. | |
10 | ||
11 | This file is part of GDB. | |
12 | ||
13 | This program is free software; you can redistribute it and/or modify | |
14 | it under the terms of the GNU General Public License as published by | |
15 | the Free Software Foundation; either version 2 of the License, or | |
16 | (at your option) any later version. | |
17 | ||
18 | This program is distributed in the hope that it will be useful, | |
19 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
20 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
21 | GNU General Public License for more details. | |
22 | ||
23 | You should have received a copy of the GNU General Public License | |
24 | along with this program; if not, write to the Free Software | |
25 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
26 | ||
7da1e27d SG |
27 | #include "defs.h" |
28 | #include "frame.h" | |
29 | #include "inferior.h" | |
30 | #include "target.h" | |
31 | ||
32 | #ifdef USG | |
33 | #include <sys/types.h> | |
34 | #endif | |
35 | ||
36 | #include <sys/param.h> | |
37 | #include <sys/dir.h> | |
38 | #include <signal.h> | |
39 | #include <sys/ioctl.h> | |
40 | #ifndef USG | |
41 | #include <sys/ptrace.h> | |
42 | #endif | |
43 | ||
44 | ||
45 | #ifndef PT_ATTACH | |
46 | #define PT_ATTACH PTRACE_ATTACH | |
47 | #endif | |
48 | #ifndef PT_DETACH | |
49 | #define PT_DETACH PTRACE_DETACH | |
50 | #endif | |
51 | ||
52 | #include "gdbcore.h" | |
53 | #include <sys/user.h> /* After a.out.h */ | |
54 | #include <sys/file.h> | |
55 | #include <sys/stat.h> | |
56 | \f | |
57 | /* This function simply calls ptrace with the given arguments. | |
58 | It exists so that all calls to ptrace are isolated in this | |
59 | machine-dependent file. */ | |
60 | int | |
61 | call_ptrace (request, pid, addr, data) | |
e676a15f FF |
62 | int request, pid; |
63 | PTRACE_ARG3_TYPE addr; | |
64 | int data; | |
7da1e27d SG |
65 | { |
66 | return ptrace (request, pid, addr, data); | |
67 | } | |
68 | ||
69 | #ifdef DEBUG_PTRACE | |
70 | /* For the rest of the file, use an extra level of indirection */ | |
71 | /* This lets us breakpoint usefully on call_ptrace. */ | |
72 | #define ptrace call_ptrace | |
73 | #endif | |
74 | ||
75 | /* This is used when GDB is exiting. It gives less chance of error.*/ | |
76 | ||
77 | void | |
78 | kill_inferior_fast () | |
79 | { | |
80 | if (inferior_pid == 0) | |
81 | return; | |
e676a15f | 82 | ptrace (PT_KILL, inferior_pid, (PTRACE_ARG3_TYPE) 0, 0); |
7da1e27d SG |
83 | wait ((int *)0); |
84 | } | |
85 | ||
86 | void | |
87 | kill_inferior () | |
88 | { | |
89 | kill_inferior_fast (); | |
90 | target_mourn_inferior (); | |
91 | } | |
92 | ||
93 | /* Resume execution of the inferior process. | |
94 | If STEP is nonzero, single-step it. | |
95 | If SIGNAL is nonzero, give it that signal. */ | |
96 | ||
97 | void | |
98 | child_resume (step, signal) | |
99 | int step; | |
100 | int signal; | |
101 | { | |
102 | errno = 0; | |
103 | ||
e676a15f FF |
104 | /* An address of (PTRACE_ARG3_TYPE) 1 tells ptrace to continue from where |
105 | it was. (If GDB wanted it to start some other way, we have already | |
106 | written a new PC value to the child.) */ | |
7da1e27d SG |
107 | |
108 | if (step) | |
e676a15f | 109 | ptrace (PT_STEP, inferior_pid, (PTRACE_ARG3_TYPE) 1, signal); |
7da1e27d | 110 | else |
e676a15f | 111 | ptrace (PT_CONTINUE, inferior_pid, (PTRACE_ARG3_TYPE) 1, signal); |
7da1e27d SG |
112 | |
113 | if (errno) | |
114 | perror_with_name ("ptrace"); | |
115 | } | |
116 | \f | |
117 | #ifdef ATTACH_DETACH | |
118 | /* Nonzero if we are debugging an attached process rather than | |
119 | an inferior. */ | |
120 | extern int attach_flag; | |
121 | ||
122 | /* Start debugging the process whose number is PID. */ | |
123 | int | |
124 | attach (pid) | |
125 | int pid; | |
126 | { | |
127 | errno = 0; | |
e676a15f | 128 | ptrace (PT_ATTACH, pid, (PTRACE_ARG3_TYPE) 0, 0); |
7da1e27d SG |
129 | if (errno) |
130 | perror_with_name ("ptrace"); | |
131 | attach_flag = 1; | |
132 | return pid; | |
133 | } | |
134 | ||
135 | /* Stop debugging the process whose number is PID | |
136 | and continue it with signal number SIGNAL. | |
137 | SIGNAL = 0 means just continue it. */ | |
138 | ||
139 | void | |
140 | detach (signal) | |
141 | int signal; | |
142 | { | |
143 | errno = 0; | |
e676a15f | 144 | ptrace (PT_DETACH, inferior_pid, (PTRACE_ARG3_TYPE) 1, signal); |
7da1e27d SG |
145 | if (errno) |
146 | perror_with_name ("ptrace"); | |
147 | attach_flag = 0; | |
148 | } | |
149 | #endif /* ATTACH_DETACH */ | |
150 | \f | |
151 | #if !defined (FETCH_INFERIOR_REGISTERS) | |
152 | ||
153 | /* KERNEL_U_ADDR is the amount to subtract from u.u_ar0 | |
154 | to get the offset in the core file of the register values. */ | |
155 | #if defined (KERNEL_U_ADDR_BSD) | |
156 | /* Get kernel_u_addr using BSD-style nlist(). */ | |
157 | CORE_ADDR kernel_u_addr; | |
158 | ||
159 | #include <a.out.gnu.h> /* For struct nlist */ | |
160 | ||
161 | void | |
162 | _initialize_kernel_u_addr () | |
163 | { | |
164 | struct nlist names[2]; | |
165 | ||
166 | names[0].n_un.n_name = "_u"; | |
167 | names[1].n_un.n_name = NULL; | |
168 | if (nlist ("/vmunix", names) == 0) | |
169 | kernel_u_addr = names[0].n_value; | |
170 | else | |
171 | fatal ("Unable to get kernel u area address."); | |
172 | } | |
173 | #endif /* KERNEL_U_ADDR_BSD. */ | |
174 | ||
175 | #if defined (KERNEL_U_ADDR_HPUX) | |
176 | /* Get kernel_u_addr using HPUX-style nlist(). */ | |
177 | CORE_ADDR kernel_u_addr; | |
178 | ||
179 | struct hpnlist { | |
180 | char * n_name; | |
181 | long n_value; | |
182 | unsigned char n_type; | |
183 | unsigned char n_length; | |
184 | short n_almod; | |
185 | short n_unused; | |
186 | }; | |
187 | static struct hpnlist nl[] = {{ "_u", -1, }, { (char *) 0, }}; | |
188 | ||
189 | /* read the value of the u area from the hp-ux kernel */ | |
190 | void _initialize_kernel_u_addr () | |
191 | { | |
192 | struct user u; | |
193 | nlist ("/hp-ux", &nl); | |
194 | kernel_u_addr = nl[0].n_value; | |
195 | } | |
196 | #endif /* KERNEL_U_ADDR_HPUX. */ | |
197 | ||
198 | #if !defined (offsetof) | |
199 | #define offsetof(TYPE, MEMBER) ((unsigned long) &((TYPE *)0)->MEMBER) | |
200 | #endif | |
201 | ||
202 | /* U_REGS_OFFSET is the offset of the registers within the u area. */ | |
203 | #if !defined (U_REGS_OFFSET) | |
204 | #define U_REGS_OFFSET \ | |
205 | ptrace (PT_READ_U, inferior_pid, \ | |
e676a15f FF |
206 | (PTRACE_ARG3_TYPE) (offsetof (struct user, u_ar0)), 0) \ |
207 | - KERNEL_U_ADDR | |
7da1e27d SG |
208 | #endif |
209 | ||
210 | /* Registers we shouldn't try to fetch. */ | |
211 | #if !defined (CANNOT_FETCH_REGISTER) | |
212 | #define CANNOT_FETCH_REGISTER(regno) 0 | |
213 | #endif | |
214 | ||
215 | /* Fetch one register. */ | |
216 | ||
217 | static void | |
218 | fetch_register (regno) | |
219 | int regno; | |
220 | { | |
221 | register unsigned int regaddr; | |
222 | char buf[MAX_REGISTER_RAW_SIZE]; | |
223 | char mess[128]; /* For messages */ | |
224 | register int i; | |
225 | ||
226 | /* Offset of registers within the u area. */ | |
227 | unsigned int offset; | |
228 | ||
229 | if (CANNOT_FETCH_REGISTER (regno)) | |
230 | { | |
231 | bzero (buf, REGISTER_RAW_SIZE (regno)); /* Supply zeroes */ | |
232 | supply_register (regno, buf); | |
233 | return; | |
234 | } | |
235 | ||
236 | offset = U_REGS_OFFSET; | |
237 | ||
238 | regaddr = register_addr (regno, offset); | |
239 | for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (int)) | |
240 | { | |
241 | errno = 0; | |
e676a15f FF |
242 | *(int *) &buf[i] = ptrace (PT_RUREGS, inferior_pid, |
243 | (PTRACE_ARG3_TYPE) regaddr, 0); | |
7da1e27d SG |
244 | regaddr += sizeof (int); |
245 | if (errno != 0) | |
246 | { | |
247 | sprintf (mess, "reading register %s (#%d)", reg_names[regno], regno); | |
248 | perror_with_name (mess); | |
249 | } | |
250 | } | |
251 | if (regno == PCOQ_HEAD_REGNUM || regno == PCOQ_TAIL_REGNUM) | |
252 | buf[3] &= ~0x3; | |
253 | supply_register (regno, buf); | |
254 | } | |
255 | ||
256 | ||
257 | /* Fetch all registers, or just one, from the child process. */ | |
258 | ||
259 | void | |
260 | fetch_inferior_registers (regno) | |
261 | int regno; | |
262 | { | |
263 | if (regno == -1) | |
264 | for (regno = 0; regno < NUM_REGS; regno++) | |
265 | fetch_register (regno); | |
266 | else | |
267 | fetch_register (regno); | |
268 | } | |
269 | ||
270 | /* Registers we shouldn't try to store. */ | |
271 | #if !defined (CANNOT_STORE_REGISTER) | |
272 | #define CANNOT_STORE_REGISTER(regno) 0 | |
273 | #endif | |
274 | ||
275 | /* Store our register values back into the inferior. | |
276 | If REGNO is -1, do this for all registers. | |
277 | Otherwise, REGNO specifies which register (so we can save time). */ | |
278 | ||
279 | void | |
280 | store_inferior_registers (regno) | |
281 | int regno; | |
282 | { | |
283 | register unsigned int regaddr; | |
284 | char buf[80]; | |
285 | extern char registers[]; | |
286 | register int i; | |
287 | ||
288 | unsigned int offset = U_REGS_OFFSET; | |
289 | ||
290 | if (regno >= 0) | |
291 | { | |
292 | regaddr = register_addr (regno, offset); | |
293 | for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof(int)) | |
294 | { | |
295 | errno = 0; | |
e676a15f | 296 | ptrace (PT_WRITE_U, inferior_pid, (PTRACE_ARG3_TYPE) regaddr, |
7da1e27d SG |
297 | *(int *) ®isters[REGISTER_BYTE (regno) + i]); |
298 | if (errno != 0) | |
299 | { | |
300 | sprintf (buf, "writing register number %d(%d)", regno, i); | |
301 | perror_with_name (buf); | |
302 | } | |
303 | regaddr += sizeof(int); | |
304 | } | |
305 | } | |
306 | else | |
307 | { | |
308 | for (regno = 0; regno < NUM_REGS; regno++) | |
309 | { | |
310 | if (CANNOT_STORE_REGISTER (regno)) | |
311 | continue; | |
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, |
7da1e27d SG |
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); | |
322 | } | |
323 | regaddr += sizeof(int); | |
324 | } | |
325 | } | |
326 | } | |
327 | return; | |
328 | } | |
329 | #endif /* !defined (FETCH_INFERIOR_REGISTERS). */ | |
330 | \f | |
331 | /* NOTE! I tried using PTRACE_READDATA, etc., to read and write memory | |
332 | in the NEW_SUN_PTRACE case. | |
333 | It ought to be straightforward. But it appears that writing did | |
334 | not write the data that I specified. I cannot understand where | |
335 | it got the data that it actually did write. */ | |
336 | ||
337 | /* Copy LEN bytes to or from inferior's memory starting at MEMADDR | |
338 | to debugger memory starting at MYADDR. Copy to inferior if | |
339 | WRITE is nonzero. | |
340 | ||
341 | Returns the length copied, which is either the LEN argument or zero. | |
342 | This xfer function does not do partial moves, since child_ops | |
343 | doesn't allow memory operations to cross below us in the target stack | |
344 | anyway. */ | |
345 | ||
346 | int | |
347 | child_xfer_memory (memaddr, myaddr, len, write, target) | |
348 | CORE_ADDR memaddr; | |
349 | char *myaddr; | |
350 | int len; | |
351 | int write; | |
352 | struct target_ops *target; /* ignored */ | |
353 | { | |
354 | register int i; | |
355 | /* Round starting address down to longword boundary. */ | |
356 | register CORE_ADDR addr = memaddr & - sizeof (int); | |
357 | /* Round ending address up; get number of longwords that makes. */ | |
358 | register int count | |
359 | = (((memaddr + len) - addr) + sizeof (int) - 1) / sizeof (int); | |
360 | /* Allocate buffer of that many longwords. */ | |
361 | register int *buffer = (int *) alloca (count * sizeof (int)); | |
362 | ||
363 | if (write) | |
364 | { | |
365 | /* Fill start and end extra bytes of buffer with existing memory data. */ | |
366 | ||
367 | if (addr != memaddr || len < (int)sizeof (int)) { | |
368 | /* Need part of initial word -- fetch it. */ | |
e676a15f FF |
369 | buffer[0] = ptrace (PT_READ_I, inferior_pid, (PTRACE_ARG3_TYPE) addr, |
370 | 0); | |
7da1e27d SG |
371 | } |
372 | ||
373 | if (count > 1) /* FIXME, avoid if even boundary */ | |
374 | { | |
375 | buffer[count - 1] | |
376 | = ptrace (PT_READ_I, inferior_pid, | |
e676a15f FF |
377 | (PTRACE_ARG3_TYPE) (addr + (count - 1) * sizeof (int)), |
378 | 0); | |
7da1e27d SG |
379 | } |
380 | ||
381 | /* Copy data to be written over corresponding part of buffer */ | |
382 | ||
383 | bcopy (myaddr, (char *) buffer + (memaddr & (sizeof (int) - 1)), len); | |
384 | ||
385 | /* Write the entire buffer. */ | |
386 | ||
387 | for (i = 0; i < count; i++, addr += sizeof (int)) | |
388 | { | |
389 | errno = 0; | |
e676a15f FF |
390 | ptrace (PT_WRITE_D, inferior_pid, (PTRACE_ARG3_TYPE) addr, |
391 | buffer[i]); | |
7da1e27d SG |
392 | if (errno) |
393 | { | |
394 | /* Using the appropriate one (I or D) is necessary for | |
395 | Gould NP1, at least. */ | |
396 | errno = 0; | |
e676a15f FF |
397 | ptrace (PT_WRITE_I, inferior_pid, (PTRACE_ARG3_TYPE) addr, |
398 | buffer[i]); | |
7da1e27d SG |
399 | } |
400 | if (errno) | |
401 | return 0; | |
402 | } | |
403 | } | |
404 | else | |
405 | { | |
406 | /* Read all the longwords */ | |
407 | for (i = 0; i < count; i++, addr += sizeof (int)) | |
408 | { | |
409 | errno = 0; | |
e676a15f FF |
410 | buffer[i] = ptrace (PT_READ_I, inferior_pid, |
411 | (PTRACE_ARG3_TYPE) addr, 0); | |
7da1e27d SG |
412 | if (errno) |
413 | return 0; | |
414 | QUIT; | |
415 | } | |
416 | ||
417 | /* Copy appropriate bytes out of the buffer. */ | |
418 | bcopy ((char *) buffer + (memaddr & (sizeof (int) - 1)), myaddr, len); | |
419 | } | |
420 | return len; | |
421 | } |