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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" | |
01d1590b SG |
28 | #include "target.h" |
29 | #include <sys/ptrace.h> | |
9f739abd SG |
30 | #include <sys/param.h> |
31 | #include <sys/user.h> | |
32 | ||
33 | extern CORE_ADDR text_end; | |
ca048722 | 34 | |
01d1590b | 35 | static void fetch_register (); |
ca048722 RP |
36 | |
37 | /* This function simply calls ptrace with the given arguments. | |
38 | It exists so that all calls to ptrace are isolated in this | |
39 | machine-dependent file. */ | |
ca048722 RP |
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 | } | |
ca048722 RP |
48 | |
49 | void | |
50 | kill_inferior () | |
51 | { | |
52 | if (inferior_pid == 0) | |
53 | return; | |
01d1590b | 54 | ptrace (PT_EXIT, inferior_pid, (PTRACE_ARG3_TYPE) 0, 0, 0); |
ca048722 RP |
55 | wait ((int *)0); |
56 | target_mourn_inferior (); | |
57 | } | |
58 | ||
ca048722 RP |
59 | /* Start debugging the process whose number is PID. */ |
60 | int | |
61 | attach (pid) | |
62 | int pid; | |
63 | { | |
64 | errno = 0; | |
65 | ptrace (PT_ATTACH, pid, (PTRACE_ARG3_TYPE) 0, 0, 0); | |
66 | if (errno) | |
67 | perror_with_name ("ptrace"); | |
68 | attach_flag = 1; | |
69 | return pid; | |
70 | } | |
71 | ||
72 | /* Stop debugging the process whose number is PID | |
73 | and continue it with signal number SIGNAL. | |
74 | SIGNAL = 0 means just continue it. */ | |
75 | ||
76 | void | |
77 | detach (signal) | |
78 | int signal; | |
79 | { | |
80 | errno = 0; | |
81 | ptrace (PT_DETACH, inferior_pid, (PTRACE_ARG3_TYPE) 1, signal, 0); | |
82 | if (errno) | |
83 | perror_with_name ("ptrace"); | |
84 | attach_flag = 0; | |
85 | } | |
ca048722 RP |
86 | |
87 | /* Fetch all registers, or just one, from the child process. */ | |
88 | ||
89 | void | |
90 | fetch_inferior_registers (regno) | |
91 | int regno; | |
92 | { | |
93 | if (regno == -1) | |
94 | for (regno = 0; regno < NUM_REGS; regno++) | |
95 | fetch_register (regno); | |
96 | else | |
97 | fetch_register (regno); | |
98 | } | |
99 | ||
ca048722 RP |
100 | /* Store our register values back into the inferior. |
101 | If REGNO is -1, do this for all registers. | |
102 | Otherwise, REGNO specifies which register (so we can save time). */ | |
103 | ||
104 | void | |
105 | store_inferior_registers (regno) | |
106 | int regno; | |
107 | { | |
108 | register unsigned int regaddr; | |
109 | char buf[80]; | |
110 | extern char registers[]; | |
111 | register int i; | |
ca048722 | 112 | unsigned int offset = U_REGS_OFFSET; |
9f739abd | 113 | int scratch; |
ca048722 RP |
114 | |
115 | if (regno >= 0) | |
116 | { | |
117 | regaddr = register_addr (regno, offset); | |
9f739abd SG |
118 | errno = 0; |
119 | if (regno == PCOQ_HEAD_REGNUM || regno == PCOQ_TAIL_REGNUM) | |
120 | { | |
121 | scratch = *(int *) ®isters[REGISTER_BYTE (regno)] | 0x3; | |
122 | ptrace (PT_WUREGS, inferior_pid, (PTRACE_ARG3_TYPE) regaddr, | |
123 | scratch, 0); | |
124 | if (errno != 0) | |
125 | { | |
126 | sprintf (buf, "writing register number %d(%d)", regno, i); | |
127 | perror_with_name (buf); | |
128 | } | |
129 | } | |
130 | else | |
131 | for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof(int)) | |
132 | { | |
133 | errno = 0; | |
134 | ptrace (PT_WUREGS, inferior_pid, (PTRACE_ARG3_TYPE) regaddr, | |
135 | *(int *) ®isters[REGISTER_BYTE (regno) + i], 0); | |
136 | if (errno != 0) | |
137 | { | |
138 | sprintf (buf, "writing register number %d(%d)", regno, i); | |
139 | perror_with_name (buf); | |
140 | } | |
141 | regaddr += sizeof(int); | |
142 | } | |
ca048722 RP |
143 | } |
144 | else | |
145 | { | |
146 | for (regno = 0; regno < NUM_REGS; regno++) | |
147 | { | |
9f739abd SG |
148 | if (CANNOT_STORE_REGISTER (regno)) |
149 | continue; | |
ca048722 | 150 | regaddr = register_addr (regno, offset); |
9f739abd SG |
151 | errno = 0; |
152 | if (regno == PCOQ_HEAD_REGNUM || regno == PCOQ_TAIL_REGNUM) | |
153 | { | |
154 | scratch = *(int *) ®isters[REGISTER_BYTE (regno)] | 0x3; | |
155 | ptrace (PT_WUREGS, inferior_pid, (PTRACE_ARG3_TYPE) regaddr, | |
156 | scratch, 0); | |
157 | if (errno != 0) | |
158 | { | |
159 | sprintf (buf, "writing register number %d(%d)", regno, i); | |
160 | perror_with_name (buf); | |
161 | } | |
162 | } | |
163 | else | |
164 | for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof(int)) | |
165 | { | |
166 | errno = 0; | |
167 | ptrace (PT_WUREGS, inferior_pid, (PTRACE_ARG3_TYPE) regaddr, | |
168 | *(int *) ®isters[REGISTER_BYTE (regno) + i], 0); | |
169 | if (errno != 0) | |
170 | { | |
171 | sprintf (buf, "writing register number %d(%d)", regno, i); | |
172 | perror_with_name (buf); | |
173 | } | |
174 | regaddr += sizeof(int); | |
175 | } | |
ca048722 RP |
176 | } |
177 | } | |
178 | return; | |
179 | } | |
180 | ||
181 | /* KERNEL_U_ADDR is the amount to subtract from u.u_ar0 | |
182 | to get the offset in the core file of the register values. */ | |
ca048722 | 183 | |
ca048722 RP |
184 | /* Get kernel_u_addr using HPUX-style nlist(). */ |
185 | CORE_ADDR kernel_u_addr; | |
186 | ||
187 | struct hpnlist { | |
188 | char * n_name; | |
189 | long n_value; | |
190 | unsigned char n_type; | |
191 | unsigned char n_length; | |
192 | short n_almod; | |
193 | short n_unused; | |
194 | }; | |
195 | static struct hpnlist nl[] = {{ "_u", -1, }, { (char *) 0, }}; | |
196 | ||
197 | /* read the value of the u area from the hp-ux kernel */ | |
198 | void _initialize_kernel_u_addr () | |
199 | { | |
200 | struct user u; | |
201 | nlist ("/hp-ux", &nl); | |
202 | kernel_u_addr = nl[0].n_value; | |
203 | } | |
ca048722 RP |
204 | |
205 | #if !defined (offsetof) | |
206 | #define offsetof(TYPE, MEMBER) ((unsigned long) &((TYPE *)0)->MEMBER) | |
207 | #endif | |
208 | ||
209 | /* U_REGS_OFFSET is the offset of the registers within the u area. */ | |
210 | #if !defined (U_REGS_OFFSET) | |
211 | #define U_REGS_OFFSET \ | |
212 | ptrace (PT_READ_U, inferior_pid, \ | |
213 | (PTRACE_ARG3_TYPE) (offsetof (struct user, u_ar0)), 0, 0) \ | |
214 | - KERNEL_U_ADDR | |
215 | #endif | |
216 | ||
ca048722 RP |
217 | /* Fetch one register. */ |
218 | ||
219 | static void | |
220 | fetch_register (regno) | |
221 | int regno; | |
222 | { | |
223 | register unsigned int regaddr; | |
224 | char buf[MAX_REGISTER_RAW_SIZE]; | |
225 | char mess[128]; /* For messages */ | |
226 | register int i; | |
227 | ||
228 | /* Offset of registers within the u area. */ | |
229 | unsigned int offset; | |
230 | ||
ca048722 RP |
231 | offset = U_REGS_OFFSET; |
232 | ||
233 | regaddr = register_addr (regno, offset); | |
234 | for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (int)) | |
235 | { | |
236 | errno = 0; | |
237 | *(int *) &buf[i] = ptrace (PT_RUREGS, inferior_pid, | |
238 | (PTRACE_ARG3_TYPE) regaddr, 0, 0); | |
239 | regaddr += sizeof (int); | |
240 | if (errno != 0) | |
241 | { | |
242 | sprintf (mess, "reading register %s (#%d)", reg_names[regno], regno); | |
243 | perror_with_name (mess); | |
244 | } | |
245 | } | |
9f739abd SG |
246 | if (regno == PCOQ_HEAD_REGNUM || regno == PCOQ_TAIL_REGNUM) |
247 | buf[3] &= ~0x3; | |
ca048722 RP |
248 | supply_register (regno, buf); |
249 | } | |
250 | ||
251 | ||
252 | ||
253 | /* Resume execution of the inferior process. | |
254 | If STEP is nonzero, single-step it. | |
255 | If SIGNAL is nonzero, give it that signal. */ | |
256 | ||
257 | void | |
258 | child_resume (step, signal) | |
259 | int step; | |
260 | int signal; | |
261 | { | |
262 | errno = 0; | |
263 | ||
264 | /* An address of (PTRACE_ARG3_TYPE) 1 tells ptrace to continue from where | |
265 | it was. (If GDB wanted it to start some other way, we have already | |
266 | written a new PC value to the child.) */ | |
267 | ||
268 | if (step) | |
269 | ptrace (PT_SINGLE, inferior_pid, (PTRACE_ARG3_TYPE) 1, signal, 0); | |
270 | else | |
271 | ptrace (PT_CONTIN, inferior_pid, (PTRACE_ARG3_TYPE) 1, signal, 0); | |
272 | ||
273 | if (errno) | |
274 | perror_with_name ("ptrace"); | |
275 | } | |
276 | ||
277 | /* NOTE! I tried using PTRACE_READDATA, etc., to read and write memory | |
278 | in the NEW_SUN_PTRACE case. | |
279 | It ought to be straightforward. But it appears that writing did | |
280 | not write the data that I specified. I cannot understand where | |
281 | it got the data that it actually did write. */ | |
282 | ||
283 | /* Copy LEN bytes to or from inferior's memory starting at MEMADDR | |
284 | to debugger memory starting at MYADDR. Copy to inferior if | |
285 | WRITE is nonzero. | |
286 | ||
287 | Returns the length copied, which is either the LEN argument or zero. | |
288 | This xfer function does not do partial moves, since child_ops | |
289 | doesn't allow memory operations to cross below us in the target stack | |
290 | anyway. */ | |
291 | ||
292 | int | |
293 | child_xfer_memory (memaddr, myaddr, len, write, target) | |
294 | CORE_ADDR memaddr; | |
295 | char *myaddr; | |
296 | int len; | |
297 | int write; | |
298 | struct target_ops *target; /* ignored */ | |
299 | { | |
300 | register int i; | |
301 | /* Round starting address down to longword boundary. */ | |
302 | register CORE_ADDR addr = memaddr & - sizeof (int); | |
303 | /* Round ending address up; get number of longwords that makes. */ | |
304 | register int count | |
305 | = (((memaddr + len) - addr) + sizeof (int) - 1) / sizeof (int); | |
306 | /* Allocate buffer of that many longwords. */ | |
307 | register int *buffer = (int *) alloca (count * sizeof (int)); | |
308 | ||
309 | if (write) | |
310 | { | |
311 | /* Fill start and end extra bytes of buffer with existing memory data. */ | |
312 | ||
313 | if (addr != memaddr || len < (int)sizeof (int)) { | |
314 | /* Need part of initial word -- fetch it. */ | |
9f739abd SG |
315 | buffer[0] = ptrace (addr < text_end ? PT_RIUSER : PT_RDUSER, |
316 | inferior_pid, (PTRACE_ARG3_TYPE) addr, 0, 0); | |
ca048722 RP |
317 | } |
318 | ||
319 | if (count > 1) /* FIXME, avoid if even boundary */ | |
320 | { | |
321 | buffer[count - 1] | |
9f739abd | 322 | = ptrace (addr < text_end ? PT_RIUSER : PT_RDUSER, inferior_pid, |
ca048722 RP |
323 | (PTRACE_ARG3_TYPE) (addr + (count - 1) * sizeof (int)), |
324 | 0, 0); | |
325 | } | |
326 | ||
327 | /* Copy data to be written over corresponding part of buffer */ | |
328 | ||
329 | bcopy (myaddr, (char *) buffer + (memaddr & (sizeof (int) - 1)), len); | |
330 | ||
331 | /* Write the entire buffer. */ | |
332 | ||
333 | for (i = 0; i < count; i++, addr += sizeof (int)) | |
334 | { | |
ca048722 RP |
335 | /* The HP-UX kernel crashes if you use PT_WDUSER to write into the text |
336 | segment. FIXME -- does it work to write into the data segment using | |
337 | WIUSER, or do these idiots really expect us to figure out which segment | |
338 | the address is in, so we can use a separate system call for it??! */ | |
339 | errno = 0; | |
9f739abd SG |
340 | ptrace (addr < text_end ? PT_WIUSER : PT_WDUSER, inferior_pid, |
341 | (PTRACE_ARG3_TYPE) addr, | |
ca048722 RP |
342 | buffer[i], 0); |
343 | if (errno) | |
ca048722 RP |
344 | return 0; |
345 | } | |
346 | } | |
347 | else | |
348 | { | |
349 | /* Read all the longwords */ | |
350 | for (i = 0; i < count; i++, addr += sizeof (int)) | |
351 | { | |
352 | errno = 0; | |
9f739abd SG |
353 | buffer[i] = ptrace (addr < text_end ? PT_RIUSER : PT_RDUSER, |
354 | inferior_pid, (PTRACE_ARG3_TYPE) addr, 0, 0); | |
ca048722 RP |
355 | if (errno) |
356 | return 0; | |
357 | QUIT; | |
358 | } | |
359 | ||
360 | /* Copy appropriate bytes out of the buffer. */ | |
361 | bcopy ((char *) buffer + (memaddr & (sizeof (int) - 1)), myaddr, len); | |
362 | } | |
363 | return len; | |
364 | } |