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ca048722 RP |
1 | /* Machine-dependent hooks for the unix child process stratum. This |
2 | code is for the HP PA-RISC cpu. | |
3 | ||
4 | Copyright 1986, 1987, 1989, 1990, 1991, 1992 Free Software Foundation, Inc. | |
5 | ||
6 | Contributed by the Center for Software Science at the | |
7 | University of Utah (pa-gdb-bugs@cs.utah.edu). | |
8 | ||
9 | This file is part of GDB. | |
10 | ||
11 | This program is free software; you can redistribute it and/or modify | |
12 | it under the terms of the GNU General Public License as published by | |
13 | the Free Software Foundation; either version 2 of the License, or | |
14 | (at your option) any later version. | |
15 | ||
16 | This program is distributed in the hope that it will be useful, | |
17 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19 | GNU General Public License for more details. | |
20 | ||
21 | You should have received a copy of the GNU General Public License | |
22 | along with this program; if not, write to the Free Software | |
23 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
24 | ||
25 | ||
26 | #include "defs.h" | |
27 | #include "inferior.h" | |
28 | ||
29 | #ifndef PT_ATTACH | |
30 | #define PT_ATTACH PTRACE_ATTACH | |
31 | #endif | |
32 | #ifndef PT_DETACH | |
33 | #define PT_DETACH PTRACE_DETACH | |
34 | #endif | |
35 | ||
36 | /* This function simply calls ptrace with the given arguments. | |
37 | It exists so that all calls to ptrace are isolated in this | |
38 | machine-dependent file. */ | |
39 | #ifdef WANT_NATIVE_TARGET | |
40 | int | |
41 | call_ptrace (request, pid, addr, data) | |
42 | int request, pid; | |
43 | PTRACE_ARG3_TYPE addr; | |
44 | int data; | |
45 | { | |
46 | return ptrace (request, pid, addr, data, 0); | |
47 | } | |
48 | #endif /* WANT_NATIVE_TARGET */ | |
49 | ||
50 | #ifdef DEBUG_PTRACE | |
51 | /* For the rest of the file, use an extra level of indirection */ | |
52 | /* This lets us breakpoint usefully on call_ptrace. */ | |
53 | #define ptrace call_ptrace | |
54 | #endif | |
55 | ||
56 | void | |
57 | kill_inferior () | |
58 | { | |
59 | if (inferior_pid == 0) | |
60 | return; | |
61 | ptrace (PT_EXIT, inferior_pid, (PTRACE_ARG3_TYPE) 0, 0, 0); /* PT_EXIT = PT_KILL ? */ | |
62 | wait ((int *)0); | |
63 | target_mourn_inferior (); | |
64 | } | |
65 | ||
66 | #ifdef ATTACH_DETACH | |
67 | /* Nonzero if we are debugging an attached process rather than | |
68 | an inferior. */ | |
69 | extern int attach_flag; | |
70 | ||
71 | /* Start debugging the process whose number is PID. */ | |
72 | int | |
73 | attach (pid) | |
74 | int pid; | |
75 | { | |
76 | errno = 0; | |
77 | ptrace (PT_ATTACH, pid, (PTRACE_ARG3_TYPE) 0, 0, 0); | |
78 | if (errno) | |
79 | perror_with_name ("ptrace"); | |
80 | attach_flag = 1; | |
81 | return pid; | |
82 | } | |
83 | ||
84 | /* Stop debugging the process whose number is PID | |
85 | and continue it with signal number SIGNAL. | |
86 | SIGNAL = 0 means just continue it. */ | |
87 | ||
88 | void | |
89 | detach (signal) | |
90 | int signal; | |
91 | { | |
92 | errno = 0; | |
93 | ptrace (PT_DETACH, inferior_pid, (PTRACE_ARG3_TYPE) 1, signal, 0); | |
94 | if (errno) | |
95 | perror_with_name ("ptrace"); | |
96 | attach_flag = 0; | |
97 | } | |
98 | #endif /* ATTACH_DETACH */ | |
99 | ||
100 | /* Fetch all registers, or just one, from the child process. */ | |
101 | ||
102 | void | |
103 | fetch_inferior_registers (regno) | |
104 | int regno; | |
105 | { | |
106 | if (regno == -1) | |
107 | for (regno = 0; regno < NUM_REGS; regno++) | |
108 | fetch_register (regno); | |
109 | else | |
110 | fetch_register (regno); | |
111 | } | |
112 | ||
113 | /* Registers we shouldn't try to store. */ | |
114 | #if !defined (CANNOT_STORE_REGISTER) | |
115 | #define CANNOT_STORE_REGISTER(regno) 0 | |
116 | #endif | |
117 | ||
118 | /* Store our register values back into the inferior. | |
119 | If REGNO is -1, do this for all registers. | |
120 | Otherwise, REGNO specifies which register (so we can save time). */ | |
121 | ||
122 | void | |
123 | store_inferior_registers (regno) | |
124 | int regno; | |
125 | { | |
126 | register unsigned int regaddr; | |
127 | char buf[80]; | |
128 | extern char registers[]; | |
129 | register int i; | |
130 | ||
131 | unsigned int offset = U_REGS_OFFSET; | |
132 | ||
133 | if (regno >= 0) | |
134 | { | |
135 | regaddr = register_addr (regno, offset); | |
136 | for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof(int)) | |
137 | { | |
138 | errno = 0; | |
139 | ptrace (PT_WUAREA, inferior_pid, (PTRACE_ARG3_TYPE) regaddr, | |
140 | *(int *) ®isters[REGISTER_BYTE (regno) + i], 0); | |
141 | if (errno != 0) | |
142 | { | |
143 | sprintf (buf, "writing register number %d(%d)", regno, i); | |
144 | perror_with_name (buf); | |
145 | } | |
146 | regaddr += sizeof(int); | |
147 | } | |
148 | } | |
149 | else | |
150 | { | |
151 | for (regno = 0; regno < NUM_REGS; regno++) | |
152 | { | |
153 | if (CANNOT_STORE_REGISTER (regno)) | |
154 | continue; | |
155 | regaddr = register_addr (regno, offset); | |
156 | for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof(int)) | |
157 | { | |
158 | errno = 0; | |
159 | ptrace (PT_WUAREA, inferior_pid, (PTRACE_ARG3_TYPE) regaddr, | |
160 | *(int *) ®isters[REGISTER_BYTE (regno) + i], 0); | |
161 | if (errno != 0) | |
162 | { | |
163 | sprintf (buf, "writing register number %d(%d)", regno, i); | |
164 | perror_with_name (buf); | |
165 | } | |
166 | regaddr += sizeof(int); | |
167 | } | |
168 | } | |
169 | } | |
170 | return; | |
171 | } | |
172 | ||
173 | /* KERNEL_U_ADDR is the amount to subtract from u.u_ar0 | |
174 | to get the offset in the core file of the register values. */ | |
175 | #if defined (KERNEL_U_ADDR_BSD) | |
176 | /* Get kernel_u_addr using BSD-style nlist(). */ | |
177 | CORE_ADDR kernel_u_addr; | |
178 | ||
179 | #include <a.out.gnu.h> /* For struct nlist */ | |
180 | ||
181 | void | |
182 | _initialize_kernel_u_addr () | |
183 | { | |
184 | struct nlist names[2]; | |
185 | ||
186 | names[0].n_un.n_name = "_u"; | |
187 | names[1].n_un.n_name = NULL; | |
188 | if (nlist ("/vmunix", names) == 0) | |
189 | kernel_u_addr = names[0].n_value; | |
190 | else | |
191 | fatal ("Unable to get kernel u area address."); | |
192 | } | |
193 | #endif /* KERNEL_U_ADDR_BSD. */ | |
194 | ||
195 | #if defined (KERNEL_U_ADDR_HPUX) | |
196 | /* Get kernel_u_addr using HPUX-style nlist(). */ | |
197 | CORE_ADDR kernel_u_addr; | |
198 | ||
199 | struct hpnlist { | |
200 | char * n_name; | |
201 | long n_value; | |
202 | unsigned char n_type; | |
203 | unsigned char n_length; | |
204 | short n_almod; | |
205 | short n_unused; | |
206 | }; | |
207 | static struct hpnlist nl[] = {{ "_u", -1, }, { (char *) 0, }}; | |
208 | ||
209 | /* read the value of the u area from the hp-ux kernel */ | |
210 | void _initialize_kernel_u_addr () | |
211 | { | |
212 | struct user u; | |
213 | nlist ("/hp-ux", &nl); | |
214 | kernel_u_addr = nl[0].n_value; | |
215 | } | |
216 | #endif /* KERNEL_U_ADDR_HPUX. */ | |
217 | ||
218 | #if !defined (offsetof) | |
219 | #define offsetof(TYPE, MEMBER) ((unsigned long) &((TYPE *)0)->MEMBER) | |
220 | #endif | |
221 | ||
222 | /* U_REGS_OFFSET is the offset of the registers within the u area. */ | |
223 | #if !defined (U_REGS_OFFSET) | |
224 | #define U_REGS_OFFSET \ | |
225 | ptrace (PT_READ_U, inferior_pid, \ | |
226 | (PTRACE_ARG3_TYPE) (offsetof (struct user, u_ar0)), 0, 0) \ | |
227 | - KERNEL_U_ADDR | |
228 | #endif | |
229 | ||
230 | /* Registers we shouldn't try to fetch. */ | |
231 | #if !defined (CANNOT_FETCH_REGISTER) | |
232 | #define CANNOT_FETCH_REGISTER(regno) 0 | |
233 | #endif | |
234 | ||
235 | /* Fetch one register. */ | |
236 | ||
237 | static void | |
238 | fetch_register (regno) | |
239 | int regno; | |
240 | { | |
241 | register unsigned int regaddr; | |
242 | char buf[MAX_REGISTER_RAW_SIZE]; | |
243 | char mess[128]; /* For messages */ | |
244 | register int i; | |
245 | ||
246 | /* Offset of registers within the u area. */ | |
247 | unsigned int offset; | |
248 | ||
249 | if (CANNOT_FETCH_REGISTER (regno)) | |
250 | { | |
251 | bzero (buf, REGISTER_RAW_SIZE (regno)); /* Supply zeroes */ | |
252 | supply_register (regno, buf); | |
253 | return; | |
254 | } | |
255 | ||
256 | offset = U_REGS_OFFSET; | |
257 | ||
258 | regaddr = register_addr (regno, offset); | |
259 | for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (int)) | |
260 | { | |
261 | errno = 0; | |
262 | *(int *) &buf[i] = ptrace (PT_RUREGS, inferior_pid, | |
263 | (PTRACE_ARG3_TYPE) regaddr, 0, 0); | |
264 | regaddr += sizeof (int); | |
265 | if (errno != 0) | |
266 | { | |
267 | sprintf (mess, "reading register %s (#%d)", reg_names[regno], regno); | |
268 | perror_with_name (mess); | |
269 | } | |
270 | } | |
271 | supply_register (regno, buf); | |
272 | } | |
273 | ||
274 | ||
275 | ||
276 | /* Resume execution of the inferior process. | |
277 | If STEP is nonzero, single-step it. | |
278 | If SIGNAL is nonzero, give it that signal. */ | |
279 | ||
280 | void | |
281 | child_resume (step, signal) | |
282 | int step; | |
283 | int signal; | |
284 | { | |
285 | errno = 0; | |
286 | ||
287 | /* An address of (PTRACE_ARG3_TYPE) 1 tells ptrace to continue from where | |
288 | it was. (If GDB wanted it to start some other way, we have already | |
289 | written a new PC value to the child.) */ | |
290 | ||
291 | if (step) | |
292 | ptrace (PT_SINGLE, inferior_pid, (PTRACE_ARG3_TYPE) 1, signal, 0); | |
293 | else | |
294 | ptrace (PT_CONTIN, inferior_pid, (PTRACE_ARG3_TYPE) 1, signal, 0); | |
295 | ||
296 | if (errno) | |
297 | perror_with_name ("ptrace"); | |
298 | } | |
299 | ||
300 | /* NOTE! I tried using PTRACE_READDATA, etc., to read and write memory | |
301 | in the NEW_SUN_PTRACE case. | |
302 | It ought to be straightforward. But it appears that writing did | |
303 | not write the data that I specified. I cannot understand where | |
304 | it got the data that it actually did write. */ | |
305 | ||
306 | /* Copy LEN bytes to or from inferior's memory starting at MEMADDR | |
307 | to debugger memory starting at MYADDR. Copy to inferior if | |
308 | WRITE is nonzero. | |
309 | ||
310 | Returns the length copied, which is either the LEN argument or zero. | |
311 | This xfer function does not do partial moves, since child_ops | |
312 | doesn't allow memory operations to cross below us in the target stack | |
313 | anyway. */ | |
314 | ||
315 | int | |
316 | child_xfer_memory (memaddr, myaddr, len, write, target) | |
317 | CORE_ADDR memaddr; | |
318 | char *myaddr; | |
319 | int len; | |
320 | int write; | |
321 | struct target_ops *target; /* ignored */ | |
322 | { | |
323 | register int i; | |
324 | /* Round starting address down to longword boundary. */ | |
325 | register CORE_ADDR addr = memaddr & - sizeof (int); | |
326 | /* Round ending address up; get number of longwords that makes. */ | |
327 | register int count | |
328 | = (((memaddr + len) - addr) + sizeof (int) - 1) / sizeof (int); | |
329 | /* Allocate buffer of that many longwords. */ | |
330 | register int *buffer = (int *) alloca (count * sizeof (int)); | |
331 | ||
332 | if (write) | |
333 | { | |
334 | /* Fill start and end extra bytes of buffer with existing memory data. */ | |
335 | ||
336 | if (addr != memaddr || len < (int)sizeof (int)) { | |
337 | /* Need part of initial word -- fetch it. */ | |
338 | buffer[0] = ptrace (PT_RIUSER, inferior_pid, | |
339 | (PTRACE_ARG3_TYPE) addr, 0, 0); | |
340 | } | |
341 | ||
342 | if (count > 1) /* FIXME, avoid if even boundary */ | |
343 | { | |
344 | buffer[count - 1] | |
345 | = ptrace (PT_RIUSER, inferior_pid, | |
346 | (PTRACE_ARG3_TYPE) (addr + (count - 1) * sizeof (int)), | |
347 | 0, 0); | |
348 | } | |
349 | ||
350 | /* Copy data to be written over corresponding part of buffer */ | |
351 | ||
352 | bcopy (myaddr, (char *) buffer + (memaddr & (sizeof (int) - 1)), len); | |
353 | ||
354 | /* Write the entire buffer. */ | |
355 | ||
356 | for (i = 0; i < count; i++, addr += sizeof (int)) | |
357 | { | |
358 | #if 0 | |
359 | /* The HP-UX kernel crashes if you use PT_WDUSER to write into the text | |
360 | segment. FIXME -- does it work to write into the data segment using | |
361 | WIUSER, or do these idiots really expect us to figure out which segment | |
362 | the address is in, so we can use a separate system call for it??! */ | |
363 | errno = 0; | |
364 | ptrace (PT_WDUSER, inferior_pid, (PTRACE_ARG3_TYPE) addr, | |
365 | buffer[i], 0); | |
366 | if (errno) | |
367 | #endif | |
368 | { | |
369 | /* Using the appropriate one (I or D) is necessary for | |
370 | Gould NP1, at least. */ | |
371 | errno = 0; | |
372 | ptrace (PT_WIUSER, inferior_pid, (PTRACE_ARG3_TYPE) addr, | |
373 | buffer[i], 0); | |
374 | } | |
375 | if (errno) | |
376 | return 0; | |
377 | } | |
378 | } | |
379 | else | |
380 | { | |
381 | /* Read all the longwords */ | |
382 | for (i = 0; i < count; i++, addr += sizeof (int)) | |
383 | { | |
384 | errno = 0; | |
385 | buffer[i] = ptrace (PT_RIUSER, inferior_pid, | |
386 | (PTRACE_ARG3_TYPE) addr, 0, 0); | |
387 | if (errno) | |
388 | return 0; | |
389 | QUIT; | |
390 | } | |
391 | ||
392 | /* Copy appropriate bytes out of the buffer. */ | |
393 | bcopy ((char *) buffer + (memaddr & (sizeof (int) - 1)), myaddr, len); | |
394 | } | |
395 | return len; | |
396 | } | |
397 |