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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 | ||
66a1aa07 | 4 | Copyright 1986, 1987, 1989, 1990, 1991, 1992, 1993 Free Software Foundation, Inc. |
ca048722 RP |
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 | #include "defs.h" | |
26 | #include "inferior.h" | |
66a1aa07 SG |
27 | #include "target.h" |
28 | #include <sys/ptrace.h> | |
ca048722 RP |
29 | |
30 | #ifndef PT_ATTACH | |
31 | #define PT_ATTACH PTRACE_ATTACH | |
32 | #endif | |
2f1c04d1 | 33 | |
ca048722 RP |
34 | #ifndef PT_DETACH |
35 | #define PT_DETACH PTRACE_DETACH | |
36 | #endif | |
37 | ||
38 | /* This function simply calls ptrace with the given arguments. | |
39 | It exists so that all calls to ptrace are isolated in this | |
40 | machine-dependent file. */ | |
2f1c04d1 | 41 | |
ca048722 RP |
42 | int |
43 | call_ptrace (request, pid, addr, data) | |
44 | int request, pid; | |
45 | PTRACE_ARG3_TYPE addr; | |
46 | int data; | |
47 | { | |
8a99c712 | 48 | return ptrace (request, pid, addr, data, 0); |
ca048722 | 49 | } |
ca048722 | 50 | |
8a99c712 JK |
51 | /* Use an extra level of indirection for ptrace calls. |
52 | This lets us breakpoint usefully on call_ptrace. It also | |
53 | allows us to pass an extra argument to ptrace without | |
54 | using an ANSI-C specific macro. */ | |
55 | ||
ca048722 | 56 | #define ptrace call_ptrace |
ca048722 RP |
57 | |
58 | void | |
59 | kill_inferior () | |
60 | { | |
61 | if (inferior_pid == 0) | |
62 | return; | |
63 | ptrace (PT_KILL, inferior_pid, (PTRACE_ARG3_TYPE) 0, 0); | |
64 | wait ((int *)0); | |
65 | target_mourn_inferior (); | |
66 | } | |
67 | ||
68 | #ifdef ATTACH_DETACH | |
ca048722 RP |
69 | |
70 | /* Start debugging the process whose number is PID. */ | |
71 | int | |
72 | attach (pid) | |
73 | int pid; | |
74 | { | |
75 | errno = 0; | |
76 | ptrace (PT_ATTACH, pid, (PTRACE_ARG3_TYPE) 0, 0); | |
77 | if (errno) | |
78 | perror_with_name ("ptrace"); | |
79 | attach_flag = 1; | |
80 | return pid; | |
81 | } | |
82 | ||
83 | /* Stop debugging the process whose number is PID | |
84 | and continue it with signal number SIGNAL. | |
85 | SIGNAL = 0 means just continue it. */ | |
86 | ||
87 | void | |
88 | detach (signal) | |
89 | int signal; | |
90 | { | |
91 | errno = 0; | |
92 | ptrace (PT_DETACH, inferior_pid, (PTRACE_ARG3_TYPE) 1, signal); | |
93 | if (errno) | |
94 | perror_with_name ("ptrace"); | |
95 | attach_flag = 0; | |
96 | } | |
97 | #endif /* ATTACH_DETACH */ | |
98 | \f | |
99 | ||
100 | ||
ca048722 RP |
101 | /* KERNEL_U_ADDR is the amount to subtract from u.u_ar0 |
102 | to get the offset in the core file of the register values. */ | |
103 | #if defined (KERNEL_U_ADDR_BSD) | |
104 | /* Get kernel_u_addr using BSD-style nlist(). */ | |
105 | CORE_ADDR kernel_u_addr; | |
106 | ||
107 | #include <a.out.gnu.h> /* For struct nlist */ | |
108 | ||
109 | void | |
110 | _initialize_kernel_u_addr () | |
111 | { | |
112 | struct nlist names[2]; | |
113 | ||
114 | names[0].n_un.n_name = "_u"; | |
115 | names[1].n_un.n_name = NULL; | |
116 | if (nlist ("/vmunix", names) == 0) | |
117 | kernel_u_addr = names[0].n_value; | |
118 | else | |
119 | fatal ("Unable to get kernel u area address."); | |
120 | } | |
121 | #endif /* KERNEL_U_ADDR_BSD. */ | |
122 | ||
123 | #if defined (KERNEL_U_ADDR_HPUX) | |
124 | /* Get kernel_u_addr using HPUX-style nlist(). */ | |
125 | CORE_ADDR kernel_u_addr; | |
126 | ||
127 | struct hpnlist { | |
128 | char * n_name; | |
129 | long n_value; | |
130 | unsigned char n_type; | |
131 | unsigned char n_length; | |
132 | short n_almod; | |
133 | short n_unused; | |
134 | }; | |
135 | static struct hpnlist nl[] = {{ "_u", -1, }, { (char *) 0, }}; | |
136 | ||
137 | /* read the value of the u area from the hp-ux kernel */ | |
976bb0be JK |
138 | void |
139 | _initialize_kernel_u_addr () | |
ca048722 RP |
140 | { |
141 | struct user u; | |
142 | nlist ("/hp-ux", &nl); | |
143 | kernel_u_addr = nl[0].n_value; | |
144 | } | |
145 | #endif /* KERNEL_U_ADDR_HPUX. */ | |
146 | ||
147 | #if !defined (offsetof) | |
148 | #define offsetof(TYPE, MEMBER) ((unsigned long) &((TYPE *)0)->MEMBER) | |
149 | #endif | |
150 | ||
151 | /* U_REGS_OFFSET is the offset of the registers within the u area. */ | |
152 | #if !defined (U_REGS_OFFSET) | |
153 | #define U_REGS_OFFSET \ | |
154 | ptrace (PT_READ_U, inferior_pid, \ | |
155 | (PTRACE_ARG3_TYPE) (offsetof (struct user, u_ar0)), 0) \ | |
156 | - KERNEL_U_ADDR | |
157 | #endif | |
158 | ||
ca048722 RP |
159 | /* Fetch one register. */ |
160 | ||
161 | static void | |
162 | fetch_register (regno) | |
163 | int regno; | |
164 | { | |
165 | register unsigned int regaddr; | |
166 | char buf[MAX_REGISTER_RAW_SIZE]; | |
ca048722 RP |
167 | register int i; |
168 | ||
169 | /* Offset of registers within the u area. */ | |
170 | unsigned int offset; | |
171 | ||
ca048722 RP |
172 | offset = U_REGS_OFFSET; |
173 | ||
174 | regaddr = register_addr (regno, offset); | |
175 | for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (int)) | |
176 | { | |
177 | errno = 0; | |
178 | *(int *) &buf[i] = ptrace (PT_RUREGS, inferior_pid, | |
179 | (PTRACE_ARG3_TYPE) regaddr, 0); | |
180 | regaddr += sizeof (int); | |
181 | if (errno != 0) | |
182 | { | |
72943ad0 JK |
183 | /* Warning, not error, in case we are attached; sometimes the |
184 | kernel doesn't let us at the registers. */ | |
185 | char *err = safe_strerror (errno); | |
186 | char *msg = alloca (strlen (err) + 128); | |
187 | sprintf (msg, "reading register %s: %s", reg_names[regno], err); | |
188 | warning (msg); | |
189 | goto error_exit; | |
ca048722 RP |
190 | } |
191 | } | |
192 | supply_register (regno, buf); | |
72943ad0 | 193 | error_exit:; |
ca048722 RP |
194 | } |
195 | ||
ca048722 RP |
196 | /* Fetch all registers, or just one, from the child process. */ |
197 | ||
ca048722 RP |
198 | void |
199 | fetch_inferior_registers (regno) | |
200 | int regno; | |
201 | { | |
202 | if (regno == -1) | |
203 | for (regno = 0; regno < NUM_REGS; regno++) | |
204 | fetch_register (regno); | |
205 | else | |
206 | fetch_register (regno); | |
207 | } | |
208 | ||
ca048722 RP |
209 | /* Store our register values back into the inferior. |
210 | If REGNO is -1, do this for all registers. | |
211 | Otherwise, REGNO specifies which register (so we can save time). */ | |
212 | ||
213 | void | |
214 | store_inferior_registers (regno) | |
215 | int regno; | |
216 | { | |
217 | register unsigned int regaddr; | |
ca048722 RP |
218 | extern char registers[]; |
219 | register int i; | |
220 | ||
221 | unsigned int offset = U_REGS_OFFSET; | |
222 | ||
223 | if (regno >= 0) | |
224 | { | |
225 | regaddr = register_addr (regno, offset); | |
226 | for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof(int)) | |
227 | { | |
228 | errno = 0; | |
66a1aa07 | 229 | ptrace (PT_WUREGS, inferior_pid, (PTRACE_ARG3_TYPE) regaddr, |
ca048722 RP |
230 | *(int *) ®isters[REGISTER_BYTE (regno) + i]); |
231 | if (errno != 0) | |
232 | { | |
72943ad0 JK |
233 | char *err = safe_strerror (errno); |
234 | char *msg = alloca (strlen (err) + 128); | |
235 | sprintf (msg, "writing register %s: %s", reg_names[regno], err); | |
236 | warning (msg); | |
ca048722 RP |
237 | } |
238 | regaddr += sizeof(int); | |
239 | } | |
240 | } | |
241 | else | |
242 | { | |
243 | for (regno = 0; regno < NUM_REGS; regno++) | |
244 | { | |
245 | if (CANNOT_STORE_REGISTER (regno)) | |
246 | continue; | |
72943ad0 | 247 | store_inferior_registers (regno); |
ca048722 RP |
248 | } |
249 | } | |
250 | return; | |
251 | } | |
ca048722 | 252 | |
25286543 | 253 | /* Resume execution of process PID. |
ca048722 RP |
254 | If STEP is nonzero, single-step it. |
255 | If SIGNAL is nonzero, give it that signal. */ | |
256 | ||
257 | void | |
25286543 SG |
258 | child_resume (pid, step, signal) |
259 | int pid; | |
ca048722 RP |
260 | int step; |
261 | int signal; | |
262 | { | |
263 | errno = 0; | |
264 | ||
de43d7d0 SG |
265 | if (pid == -1) |
266 | pid = inferior_pid; | |
267 | ||
ca048722 RP |
268 | /* An address of (PTRACE_ARG3_TYPE) 1 tells ptrace to continue from where |
269 | it was. (If GDB wanted it to start some other way, we have already | |
270 | written a new PC value to the child.) */ | |
271 | ||
272 | if (step) | |
25286543 | 273 | ptrace (PT_STEP, pid, (PTRACE_ARG3_TYPE) 1, signal); |
ca048722 | 274 | else |
25286543 | 275 | ptrace (PT_CONTINUE, pid, (PTRACE_ARG3_TYPE) 1, signal); |
ca048722 RP |
276 | |
277 | if (errno) | |
278 | perror_with_name ("ptrace"); | |
279 | } | |
280 | ||
281 | /* NOTE! I tried using PTRACE_READDATA, etc., to read and write memory | |
282 | in the NEW_SUN_PTRACE case. | |
283 | It ought to be straightforward. But it appears that writing did | |
284 | not write the data that I specified. I cannot understand where | |
285 | it got the data that it actually did write. */ | |
286 | ||
287 | /* Copy LEN bytes to or from inferior's memory starting at MEMADDR | |
288 | to debugger memory starting at MYADDR. Copy to inferior if | |
289 | WRITE is nonzero. | |
290 | ||
291 | Returns the length copied, which is either the LEN argument or zero. | |
292 | This xfer function does not do partial moves, since child_ops | |
293 | doesn't allow memory operations to cross below us in the target stack | |
294 | anyway. */ | |
295 | ||
296 | int | |
297 | child_xfer_memory (memaddr, myaddr, len, write, target) | |
298 | CORE_ADDR memaddr; | |
299 | char *myaddr; | |
300 | int len; | |
301 | int write; | |
302 | struct target_ops *target; /* ignored */ | |
303 | { | |
304 | register int i; | |
305 | /* Round starting address down to longword boundary. */ | |
306 | register CORE_ADDR addr = memaddr & - sizeof (int); | |
307 | /* Round ending address up; get number of longwords that makes. */ | |
308 | register int count | |
309 | = (((memaddr + len) - addr) + sizeof (int) - 1) / sizeof (int); | |
310 | /* Allocate buffer of that many longwords. */ | |
311 | register int *buffer = (int *) alloca (count * sizeof (int)); | |
312 | ||
313 | if (write) | |
314 | { | |
315 | /* Fill start and end extra bytes of buffer with existing memory data. */ | |
316 | ||
317 | if (addr != memaddr || len < (int)sizeof (int)) { | |
318 | /* Need part of initial word -- fetch it. */ | |
319 | buffer[0] = ptrace (PT_READ_I, inferior_pid, (PTRACE_ARG3_TYPE) addr, | |
320 | 0); | |
321 | } | |
322 | ||
323 | if (count > 1) /* FIXME, avoid if even boundary */ | |
324 | { | |
325 | buffer[count - 1] | |
326 | = ptrace (PT_READ_I, inferior_pid, | |
327 | (PTRACE_ARG3_TYPE) (addr + (count - 1) * sizeof (int)), | |
328 | 0); | |
329 | } | |
330 | ||
331 | /* Copy data to be written over corresponding part of buffer */ | |
332 | ||
ade40d31 | 333 | memcpy ((char *) buffer + (memaddr & (sizeof (int) - 1)), myaddr, len); |
ca048722 RP |
334 | |
335 | /* Write the entire buffer. */ | |
336 | ||
337 | for (i = 0; i < count; i++, addr += sizeof (int)) | |
338 | { | |
339 | errno = 0; | |
340 | ptrace (PT_WRITE_D, inferior_pid, (PTRACE_ARG3_TYPE) addr, | |
341 | buffer[i]); | |
342 | if (errno) | |
343 | { | |
344 | /* Using the appropriate one (I or D) is necessary for | |
345 | Gould NP1, at least. */ | |
346 | errno = 0; | |
347 | ptrace (PT_WRITE_I, inferior_pid, (PTRACE_ARG3_TYPE) addr, | |
348 | buffer[i]); | |
349 | } | |
350 | if (errno) | |
351 | return 0; | |
352 | } | |
353 | } | |
354 | else | |
355 | { | |
356 | /* Read all the longwords */ | |
357 | for (i = 0; i < count; i++, addr += sizeof (int)) | |
358 | { | |
359 | errno = 0; | |
360 | buffer[i] = ptrace (PT_READ_I, inferior_pid, | |
361 | (PTRACE_ARG3_TYPE) addr, 0); | |
362 | if (errno) | |
363 | return 0; | |
364 | QUIT; | |
365 | } | |
366 | ||
367 | /* Copy appropriate bytes out of the buffer. */ | |
ade40d31 | 368 | memcpy (myaddr, (char *) buffer + (memaddr & (sizeof (int) - 1)), len); |
ca048722 RP |
369 | } |
370 | return len; | |
371 | } | |
372 |