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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 | ||
7da1e27d SG |
8 | This file is part of GDB. |
9 | ||
10 | This program is free software; you can redistribute it and/or modify | |
11 | it under the terms of the GNU General Public License as published by | |
12 | the Free Software Foundation; either version 2 of the License, or | |
13 | (at your option) any later version. | |
14 | ||
15 | This program is distributed in the hope that it will be useful, | |
16 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | GNU General Public License for more details. | |
19 | ||
20 | You should have received a copy of the GNU General Public License | |
21 | along with this program; if not, write to the Free Software | |
22 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
23 | ||
7da1e27d SG |
24 | #include "defs.h" |
25 | #include "frame.h" | |
26 | #include "inferior.h" | |
27 | #include "target.h" | |
28 | ||
29 | #ifdef USG | |
30 | #include <sys/types.h> | |
31 | #endif | |
32 | ||
33 | #include <sys/param.h> | |
34 | #include <sys/dir.h> | |
35 | #include <signal.h> | |
36 | #include <sys/ioctl.h> | |
37 | ||
38 | #include <sys/ptrace.h> | |
39 | ||
40 | ||
41 | #ifndef PT_ATTACH | |
42 | #define PT_ATTACH PTRACE_ATTACH | |
43 | #endif | |
44 | #ifndef PT_DETACH | |
45 | #define PT_DETACH PTRACE_DETACH | |
46 | #endif | |
47 | ||
48 | #include "gdbcore.h" | |
49 | #include <sys/user.h> /* After a.out.h */ | |
50 | #include <sys/file.h> | |
51 | #include <sys/stat.h> | |
52 | \f | |
53 | /* This function simply calls ptrace with the given arguments. | |
54 | It exists so that all calls to ptrace are isolated in this | |
55 | machine-dependent file. */ | |
56 | int | |
57 | call_ptrace (request, pid, addr, data) | |
e676a15f FF |
58 | int request, pid; |
59 | PTRACE_ARG3_TYPE addr; | |
60 | int data; | |
7da1e27d SG |
61 | { |
62 | return ptrace (request, pid, addr, data, 0); | |
63 | } | |
64 | ||
65 | #ifdef DEBUG_PTRACE | |
66 | /* For the rest of the file, use an extra level of indirection */ | |
67 | /* This lets us breakpoint usefully on call_ptrace. */ | |
68 | #define ptrace call_ptrace | |
69 | #endif | |
70 | ||
7da1e27d | 71 | void |
b28d3617 | 72 | kill_inferior () |
7da1e27d SG |
73 | { |
74 | if (inferior_pid == 0) | |
75 | return; | |
e676a15f | 76 | ptrace (PT_EXIT, inferior_pid, (PTRACE_ARG3_TYPE) 0, 0, 0); /* PT_EXIT = PT_KILL ? */ |
7da1e27d | 77 | wait ((int *)0); |
7da1e27d SG |
78 | target_mourn_inferior (); |
79 | } | |
80 | ||
81 | /* Resume execution of the inferior process. | |
82 | If STEP is nonzero, single-step it. | |
83 | If SIGNAL is nonzero, give it that signal. */ | |
84 | ||
85 | void | |
86 | child_resume (step, signal) | |
87 | int step; | |
88 | int signal; | |
89 | { | |
90 | errno = 0; | |
91 | ||
e676a15f FF |
92 | /* An address of (PTRACE_ARG3_TYPE) 1 tells ptrace to continue from where |
93 | it was. (If GDB wanted it to start some other way, we have already | |
94 | written a new PC value to the child.) */ | |
7da1e27d SG |
95 | |
96 | if (step) | |
e676a15f | 97 | ptrace (PT_SINGLE, inferior_pid, (PTRACE_ARG3_TYPE) 1, signal, 0); |
7da1e27d | 98 | else |
e676a15f | 99 | ptrace (PT_CONTIN, inferior_pid, (PTRACE_ARG3_TYPE) 1, signal, 0); |
7da1e27d SG |
100 | |
101 | if (errno) | |
102 | perror_with_name ("ptrace"); | |
103 | } | |
104 | \f | |
105 | #ifdef ATTACH_DETACH | |
106 | /* Nonzero if we are debugging an attached process rather than | |
107 | an inferior. */ | |
108 | extern int attach_flag; | |
109 | ||
110 | /* Start debugging the process whose number is PID. */ | |
111 | int | |
112 | attach (pid) | |
113 | int pid; | |
114 | { | |
115 | errno = 0; | |
e676a15f | 116 | ptrace (PT_ATTACH, pid, (PTRACE_ARG3_TYPE) 0, 0, 0); |
7da1e27d SG |
117 | if (errno) |
118 | perror_with_name ("ptrace"); | |
119 | attach_flag = 1; | |
120 | return pid; | |
121 | } | |
122 | ||
123 | /* Stop debugging the process whose number is PID | |
124 | and continue it with signal number SIGNAL. | |
125 | SIGNAL = 0 means just continue it. */ | |
126 | ||
127 | void | |
128 | detach (signal) | |
129 | int signal; | |
130 | { | |
131 | errno = 0; | |
e676a15f | 132 | ptrace (PT_DETACH, inferior_pid, (PTRACE_ARG3_TYPE) 1, signal, 0); |
7da1e27d SG |
133 | if (errno) |
134 | perror_with_name ("ptrace"); | |
135 | attach_flag = 0; | |
136 | } | |
137 | #endif /* ATTACH_DETACH */ | |
138 | \f | |
139 | #if !defined (FETCH_INFERIOR_REGISTERS) | |
140 | ||
141 | /* KERNEL_U_ADDR is the amount to subtract from u.u_ar0 | |
142 | to get the offset in the core file of the register values. */ | |
143 | #if defined (KERNEL_U_ADDR_BSD) | |
144 | /* Get kernel_u_addr using BSD-style nlist(). */ | |
145 | CORE_ADDR kernel_u_addr; | |
146 | ||
147 | #include <a.out.gnu.h> /* For struct nlist */ | |
148 | ||
149 | void | |
150 | _initialize_kernel_u_addr () | |
151 | { | |
152 | struct nlist names[2]; | |
153 | ||
154 | names[0].n_un.n_name = "_u"; | |
155 | names[1].n_un.n_name = NULL; | |
156 | if (nlist ("/vmunix", names) == 0) | |
157 | kernel_u_addr = names[0].n_value; | |
158 | else | |
159 | fatal ("Unable to get kernel u area address."); | |
160 | } | |
161 | #endif /* KERNEL_U_ADDR_BSD. */ | |
162 | ||
163 | #if defined (KERNEL_U_ADDR_HPUX) | |
164 | /* Get kernel_u_addr using HPUX-style nlist(). */ | |
165 | CORE_ADDR kernel_u_addr; | |
166 | ||
167 | struct hpnlist { | |
168 | char * n_name; | |
169 | long n_value; | |
170 | unsigned char n_type; | |
171 | unsigned char n_length; | |
172 | short n_almod; | |
173 | short n_unused; | |
174 | }; | |
175 | static struct hpnlist nl[] = {{ "_u", -1, }, { (char *) 0, }}; | |
176 | ||
177 | /* read the value of the u area from the hp-ux kernel */ | |
178 | void _initialize_kernel_u_addr () | |
179 | { | |
180 | struct user u; | |
181 | nlist ("/hp-ux", &nl); | |
182 | kernel_u_addr = nl[0].n_value; | |
183 | } | |
184 | #endif /* KERNEL_U_ADDR_HPUX. */ | |
185 | ||
186 | #if !defined (offsetof) | |
187 | #define offsetof(TYPE, MEMBER) ((unsigned long) &((TYPE *)0)->MEMBER) | |
188 | #endif | |
189 | ||
190 | /* U_REGS_OFFSET is the offset of the registers within the u area. */ | |
191 | #if !defined (U_REGS_OFFSET) | |
192 | #define U_REGS_OFFSET \ | |
193 | ptrace (PT_READ_U, inferior_pid, \ | |
e676a15f FF |
194 | (PTRACE_ARG3_TYPE) (offsetof (struct user, u_ar0)), 0, 0) \ |
195 | - KERNEL_U_ADDR | |
7da1e27d SG |
196 | #endif |
197 | ||
198 | /* Registers we shouldn't try to fetch. */ | |
199 | #if !defined (CANNOT_FETCH_REGISTER) | |
200 | #define CANNOT_FETCH_REGISTER(regno) 0 | |
201 | #endif | |
202 | ||
203 | /* Fetch one register. */ | |
204 | ||
205 | static void | |
206 | fetch_register (regno) | |
207 | int regno; | |
208 | { | |
209 | register unsigned int regaddr; | |
210 | char buf[MAX_REGISTER_RAW_SIZE]; | |
211 | char mess[128]; /* For messages */ | |
212 | register int i; | |
213 | ||
214 | /* Offset of registers within the u area. */ | |
215 | unsigned int offset; | |
216 | ||
217 | if (CANNOT_FETCH_REGISTER (regno)) | |
218 | { | |
219 | bzero (buf, REGISTER_RAW_SIZE (regno)); /* Supply zeroes */ | |
220 | supply_register (regno, buf); | |
221 | return; | |
222 | } | |
223 | ||
224 | offset = U_REGS_OFFSET; | |
225 | ||
226 | regaddr = register_addr (regno, offset); | |
227 | for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (int)) | |
228 | { | |
229 | errno = 0; | |
e676a15f FF |
230 | *(int *) &buf[i] = ptrace (PT_RUREGS, inferior_pid, |
231 | (PTRACE_ARG3_TYPE) regaddr, 0, 0); | |
7da1e27d SG |
232 | regaddr += sizeof (int); |
233 | if (errno != 0) | |
234 | { | |
235 | sprintf (mess, "reading register %s (#%d)", reg_names[regno], regno); | |
236 | perror_with_name (mess); | |
237 | } | |
238 | } | |
239 | if (regno == PCOQ_HEAD_REGNUM || regno == PCOQ_TAIL_REGNUM) | |
240 | buf[3] &= ~0x3; | |
241 | supply_register (regno, buf); | |
242 | } | |
243 | ||
244 | ||
245 | /* Fetch all registers, or just one, from the child process. */ | |
246 | ||
247 | void | |
248 | fetch_inferior_registers (regno) | |
249 | int regno; | |
250 | { | |
251 | if (regno == -1) | |
252 | for (regno = 0; regno < NUM_REGS; regno++) | |
253 | fetch_register (regno); | |
254 | else | |
255 | fetch_register (regno); | |
256 | } | |
257 | ||
258 | /* Registers we shouldn't try to store. */ | |
259 | #if !defined (CANNOT_STORE_REGISTER) | |
260 | #define CANNOT_STORE_REGISTER(regno) 0 | |
261 | #endif | |
262 | ||
263 | /* Store our register values back into the inferior. | |
264 | If REGNO is -1, do this for all registers. | |
265 | Otherwise, REGNO specifies which register (so we can save time). */ | |
266 | ||
267 | void | |
268 | store_inferior_registers (regno) | |
269 | int regno; | |
270 | { | |
271 | register unsigned int regaddr; | |
272 | char buf[80]; | |
273 | extern char registers[]; | |
274 | register int i; | |
275 | ||
276 | unsigned int offset = U_REGS_OFFSET; | |
277 | ||
278 | if (regno >= 0) | |
279 | { | |
280 | regaddr = register_addr (regno, offset); | |
281 | for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof(int)) | |
282 | { | |
283 | errno = 0; | |
e676a15f | 284 | ptrace (PT_WUAREA, inferior_pid, (PTRACE_ARG3_TYPE) regaddr, |
7da1e27d SG |
285 | *(int *) ®isters[REGISTER_BYTE (regno) + i], 0); |
286 | if (errno != 0) | |
287 | { | |
288 | sprintf (buf, "writing register number %d(%d)", regno, i); | |
289 | perror_with_name (buf); | |
290 | } | |
291 | regaddr += sizeof(int); | |
292 | } | |
293 | } | |
294 | else | |
295 | { | |
296 | for (regno = 0; regno < NUM_REGS; regno++) | |
297 | { | |
298 | if (CANNOT_STORE_REGISTER (regno)) | |
299 | continue; | |
300 | regaddr = register_addr (regno, offset); | |
301 | for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof(int)) | |
302 | { | |
303 | errno = 0; | |
e676a15f | 304 | ptrace (PT_WUAREA, inferior_pid, (PTRACE_ARG3_TYPE) regaddr, |
7da1e27d SG |
305 | *(int *) ®isters[REGISTER_BYTE (regno) + i], 0); |
306 | if (errno != 0) | |
307 | { | |
308 | sprintf (buf, "writing register number %d(%d)", regno, i); | |
309 | perror_with_name (buf); | |
310 | } | |
311 | regaddr += sizeof(int); | |
312 | } | |
313 | } | |
314 | } | |
315 | return; | |
316 | } | |
317 | #endif /* !defined (FETCH_INFERIOR_REGISTERS). */ | |
318 | \f | |
319 | /* NOTE! I tried using PTRACE_READDATA, etc., to read and write memory | |
320 | in the NEW_SUN_PTRACE case. | |
321 | It ought to be straightforward. But it appears that writing did | |
322 | not write the data that I specified. I cannot understand where | |
323 | it got the data that it actually did write. */ | |
324 | ||
325 | /* Copy LEN bytes to or from inferior's memory starting at MEMADDR | |
326 | to debugger memory starting at MYADDR. Copy to inferior if | |
327 | WRITE is nonzero. | |
328 | ||
329 | Returns the length copied, which is either the LEN argument or zero. | |
330 | This xfer function does not do partial moves, since child_ops | |
331 | doesn't allow memory operations to cross below us in the target stack | |
332 | anyway. */ | |
333 | ||
334 | int | |
335 | child_xfer_memory (memaddr, myaddr, len, write, target) | |
336 | CORE_ADDR memaddr; | |
337 | char *myaddr; | |
338 | int len; | |
339 | int write; | |
340 | struct target_ops *target; /* ignored */ | |
341 | { | |
342 | register int i; | |
343 | /* Round starting address down to longword boundary. */ | |
344 | register CORE_ADDR addr = memaddr & - sizeof (int); | |
345 | /* Round ending address up; get number of longwords that makes. */ | |
346 | register int count | |
347 | = (((memaddr + len) - addr) + sizeof (int) - 1) / sizeof (int); | |
348 | /* Allocate buffer of that many longwords. */ | |
349 | register int *buffer = (int *) alloca (count * sizeof (int)); | |
350 | ||
351 | if (write) | |
352 | { | |
353 | /* Fill start and end extra bytes of buffer with existing memory data. */ | |
354 | ||
355 | if (addr != memaddr || len < (int)sizeof (int)) { | |
356 | /* Need part of initial word -- fetch it. */ | |
e676a15f FF |
357 | buffer[0] = ptrace (PT_RIUSER, inferior_pid, |
358 | (PTRACE_ARG3_TYPE) addr, 0, 0); | |
7da1e27d SG |
359 | } |
360 | ||
361 | if (count > 1) /* FIXME, avoid if even boundary */ | |
362 | { | |
363 | buffer[count - 1] | |
364 | = ptrace (PT_RIUSER, inferior_pid, | |
e676a15f FF |
365 | (PTRACE_ARG3_TYPE) (addr + (count - 1) * sizeof (int)), |
366 | 0, 0); | |
7da1e27d SG |
367 | } |
368 | ||
369 | /* Copy data to be written over corresponding part of buffer */ | |
370 | ||
371 | bcopy (myaddr, (char *) buffer + (memaddr & (sizeof (int) - 1)), len); | |
372 | ||
373 | /* Write the entire buffer. */ | |
374 | ||
375 | for (i = 0; i < count; i++, addr += sizeof (int)) | |
376 | { | |
3a1e7a62 JG |
377 | #if 0 |
378 | /* The HP-UX kernel crashes if you use PT_WDUSER to write into the text | |
379 | segment. FIXME -- does it work to write into the data segment using | |
380 | WIUSER, or do these idiots really expect us to figure out which segment | |
381 | the address is in, so we can use a separate system call for it??! */ | |
7da1e27d | 382 | errno = 0; |
e676a15f FF |
383 | ptrace (PT_WDUSER, inferior_pid, (PTRACE_ARG3_TYPE) addr, |
384 | buffer[i], 0); | |
7da1e27d | 385 | if (errno) |
3a1e7a62 | 386 | #endif |
7da1e27d SG |
387 | { |
388 | /* Using the appropriate one (I or D) is necessary for | |
389 | Gould NP1, at least. */ | |
390 | errno = 0; | |
e676a15f FF |
391 | ptrace (PT_WIUSER, inferior_pid, (PTRACE_ARG3_TYPE) addr, |
392 | buffer[i], 0); | |
7da1e27d SG |
393 | } |
394 | if (errno) | |
395 | return 0; | |
396 | } | |
397 | } | |
398 | else | |
399 | { | |
400 | /* Read all the longwords */ | |
401 | for (i = 0; i < count; i++, addr += sizeof (int)) | |
402 | { | |
403 | errno = 0; | |
e676a15f FF |
404 | buffer[i] = ptrace (PT_RIUSER, inferior_pid, |
405 | (PTRACE_ARG3_TYPE) addr, 0, 0); | |
7da1e27d SG |
406 | if (errno) |
407 | return 0; | |
408 | QUIT; | |
409 | } | |
410 | ||
411 | /* Copy appropriate bytes out of the buffer. */ | |
412 | bcopy ((char *) buffer + (memaddr & (sizeof (int) - 1)), myaddr, len); | |
413 | } | |
414 | return len; | |
415 | } | |
416 | ||
417 | ||
418 | ||
419 | ||
420 | int | |
421 | getpagesize() | |
422 | { | |
423 | return(4096); | |
424 | } |