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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> | |
ca048722 | 30 | |
01d1590b | 31 | static void fetch_register (); |
ca048722 RP |
32 | |
33 | /* This function simply calls ptrace with the given arguments. | |
34 | It exists so that all calls to ptrace are isolated in this | |
35 | machine-dependent file. */ | |
ca048722 RP |
36 | int |
37 | call_ptrace (request, pid, addr, data) | |
38 | int request, pid; | |
39 | PTRACE_ARG3_TYPE addr; | |
40 | int data; | |
41 | { | |
42 | return ptrace (request, pid, addr, data, 0); | |
43 | } | |
ca048722 RP |
44 | |
45 | void | |
46 | kill_inferior () | |
47 | { | |
48 | if (inferior_pid == 0) | |
49 | return; | |
01d1590b | 50 | ptrace (PT_EXIT, inferior_pid, (PTRACE_ARG3_TYPE) 0, 0, 0); |
ca048722 RP |
51 | wait ((int *)0); |
52 | target_mourn_inferior (); | |
53 | } | |
54 | ||
ca048722 RP |
55 | /* Start debugging the process whose number is PID. */ |
56 | int | |
57 | attach (pid) | |
58 | int pid; | |
59 | { | |
60 | errno = 0; | |
61 | ptrace (PT_ATTACH, pid, (PTRACE_ARG3_TYPE) 0, 0, 0); | |
62 | if (errno) | |
63 | perror_with_name ("ptrace"); | |
64 | attach_flag = 1; | |
65 | return pid; | |
66 | } | |
67 | ||
68 | /* Stop debugging the process whose number is PID | |
69 | and continue it with signal number SIGNAL. | |
70 | SIGNAL = 0 means just continue it. */ | |
71 | ||
72 | void | |
73 | detach (signal) | |
74 | int signal; | |
75 | { | |
76 | errno = 0; | |
77 | ptrace (PT_DETACH, inferior_pid, (PTRACE_ARG3_TYPE) 1, signal, 0); | |
78 | if (errno) | |
79 | perror_with_name ("ptrace"); | |
80 | attach_flag = 0; | |
81 | } | |
ca048722 RP |
82 | |
83 | /* Fetch all registers, or just one, from the child process. */ | |
84 | ||
85 | void | |
86 | fetch_inferior_registers (regno) | |
87 | int regno; | |
88 | { | |
89 | if (regno == -1) | |
90 | for (regno = 0; regno < NUM_REGS; regno++) | |
91 | fetch_register (regno); | |
92 | else | |
93 | fetch_register (regno); | |
94 | } | |
95 | ||
ca048722 RP |
96 | /* Store our register values back into the inferior. |
97 | If REGNO is -1, do this for all registers. | |
98 | Otherwise, REGNO specifies which register (so we can save time). */ | |
99 | ||
100 | void | |
101 | store_inferior_registers (regno) | |
102 | int regno; | |
103 | { | |
104 | register unsigned int regaddr; | |
105 | char buf[80]; | |
106 | extern char registers[]; | |
107 | register int i; | |
108 | ||
109 | unsigned int offset = U_REGS_OFFSET; | |
110 | ||
111 | if (regno >= 0) | |
112 | { | |
113 | regaddr = register_addr (regno, offset); | |
114 | for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof(int)) | |
115 | { | |
116 | errno = 0; | |
117 | ptrace (PT_WUAREA, inferior_pid, (PTRACE_ARG3_TYPE) regaddr, | |
118 | *(int *) ®isters[REGISTER_BYTE (regno) + i], 0); | |
119 | if (errno != 0) | |
120 | { | |
121 | sprintf (buf, "writing register number %d(%d)", regno, i); | |
122 | perror_with_name (buf); | |
123 | } | |
124 | regaddr += sizeof(int); | |
125 | } | |
126 | } | |
127 | else | |
128 | { | |
129 | for (regno = 0; regno < NUM_REGS; regno++) | |
130 | { | |
ca048722 RP |
131 | regaddr = register_addr (regno, offset); |
132 | for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof(int)) | |
133 | { | |
134 | errno = 0; | |
135 | ptrace (PT_WUAREA, inferior_pid, (PTRACE_ARG3_TYPE) regaddr, | |
136 | *(int *) ®isters[REGISTER_BYTE (regno) + i], 0); | |
137 | if (errno != 0) | |
138 | { | |
139 | sprintf (buf, "writing register number %d(%d)", regno, i); | |
140 | perror_with_name (buf); | |
141 | } | |
142 | regaddr += sizeof(int); | |
143 | } | |
144 | } | |
145 | } | |
146 | return; | |
147 | } | |
148 | ||
149 | /* KERNEL_U_ADDR is the amount to subtract from u.u_ar0 | |
150 | to get the offset in the core file of the register values. */ | |
ca048722 | 151 | |
ca048722 RP |
152 | /* Get kernel_u_addr using HPUX-style nlist(). */ |
153 | CORE_ADDR kernel_u_addr; | |
154 | ||
155 | struct hpnlist { | |
156 | char * n_name; | |
157 | long n_value; | |
158 | unsigned char n_type; | |
159 | unsigned char n_length; | |
160 | short n_almod; | |
161 | short n_unused; | |
162 | }; | |
163 | static struct hpnlist nl[] = {{ "_u", -1, }, { (char *) 0, }}; | |
164 | ||
165 | /* read the value of the u area from the hp-ux kernel */ | |
166 | void _initialize_kernel_u_addr () | |
167 | { | |
01d1590b | 168 | #if 0 |
ca048722 | 169 | struct user u; |
01d1590b | 170 | #endif |
ca048722 RP |
171 | nlist ("/hp-ux", &nl); |
172 | kernel_u_addr = nl[0].n_value; | |
173 | } | |
ca048722 RP |
174 | |
175 | #if !defined (offsetof) | |
176 | #define offsetof(TYPE, MEMBER) ((unsigned long) &((TYPE *)0)->MEMBER) | |
177 | #endif | |
178 | ||
179 | /* U_REGS_OFFSET is the offset of the registers within the u area. */ | |
180 | #if !defined (U_REGS_OFFSET) | |
181 | #define U_REGS_OFFSET \ | |
182 | ptrace (PT_READ_U, inferior_pid, \ | |
183 | (PTRACE_ARG3_TYPE) (offsetof (struct user, u_ar0)), 0, 0) \ | |
184 | - KERNEL_U_ADDR | |
185 | #endif | |
186 | ||
ca048722 RP |
187 | /* Fetch one register. */ |
188 | ||
189 | static void | |
190 | fetch_register (regno) | |
191 | int regno; | |
192 | { | |
193 | register unsigned int regaddr; | |
194 | char buf[MAX_REGISTER_RAW_SIZE]; | |
195 | char mess[128]; /* For messages */ | |
196 | register int i; | |
197 | ||
198 | /* Offset of registers within the u area. */ | |
199 | unsigned int offset; | |
200 | ||
ca048722 RP |
201 | offset = U_REGS_OFFSET; |
202 | ||
203 | regaddr = register_addr (regno, offset); | |
204 | for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (int)) | |
205 | { | |
206 | errno = 0; | |
207 | *(int *) &buf[i] = ptrace (PT_RUREGS, inferior_pid, | |
208 | (PTRACE_ARG3_TYPE) regaddr, 0, 0); | |
209 | regaddr += sizeof (int); | |
210 | if (errno != 0) | |
211 | { | |
212 | sprintf (mess, "reading register %s (#%d)", reg_names[regno], regno); | |
213 | perror_with_name (mess); | |
214 | } | |
215 | } | |
216 | supply_register (regno, buf); | |
217 | } | |
218 | ||
219 | ||
220 | ||
221 | /* Resume execution of the inferior process. | |
222 | If STEP is nonzero, single-step it. | |
223 | If SIGNAL is nonzero, give it that signal. */ | |
224 | ||
225 | void | |
226 | child_resume (step, signal) | |
227 | int step; | |
228 | int signal; | |
229 | { | |
230 | errno = 0; | |
231 | ||
232 | /* An address of (PTRACE_ARG3_TYPE) 1 tells ptrace to continue from where | |
233 | it was. (If GDB wanted it to start some other way, we have already | |
234 | written a new PC value to the child.) */ | |
235 | ||
236 | if (step) | |
237 | ptrace (PT_SINGLE, inferior_pid, (PTRACE_ARG3_TYPE) 1, signal, 0); | |
238 | else | |
239 | ptrace (PT_CONTIN, inferior_pid, (PTRACE_ARG3_TYPE) 1, signal, 0); | |
240 | ||
241 | if (errno) | |
242 | perror_with_name ("ptrace"); | |
243 | } | |
244 | ||
245 | /* NOTE! I tried using PTRACE_READDATA, etc., to read and write memory | |
246 | in the NEW_SUN_PTRACE case. | |
247 | It ought to be straightforward. But it appears that writing did | |
248 | not write the data that I specified. I cannot understand where | |
249 | it got the data that it actually did write. */ | |
250 | ||
251 | /* Copy LEN bytes to or from inferior's memory starting at MEMADDR | |
252 | to debugger memory starting at MYADDR. Copy to inferior if | |
253 | WRITE is nonzero. | |
254 | ||
255 | Returns the length copied, which is either the LEN argument or zero. | |
256 | This xfer function does not do partial moves, since child_ops | |
257 | doesn't allow memory operations to cross below us in the target stack | |
258 | anyway. */ | |
259 | ||
260 | int | |
261 | child_xfer_memory (memaddr, myaddr, len, write, target) | |
262 | CORE_ADDR memaddr; | |
263 | char *myaddr; | |
264 | int len; | |
265 | int write; | |
266 | struct target_ops *target; /* ignored */ | |
267 | { | |
268 | register int i; | |
269 | /* Round starting address down to longword boundary. */ | |
270 | register CORE_ADDR addr = memaddr & - sizeof (int); | |
271 | /* Round ending address up; get number of longwords that makes. */ | |
272 | register int count | |
273 | = (((memaddr + len) - addr) + sizeof (int) - 1) / sizeof (int); | |
274 | /* Allocate buffer of that many longwords. */ | |
275 | register int *buffer = (int *) alloca (count * sizeof (int)); | |
276 | ||
277 | if (write) | |
278 | { | |
279 | /* Fill start and end extra bytes of buffer with existing memory data. */ | |
280 | ||
281 | if (addr != memaddr || len < (int)sizeof (int)) { | |
282 | /* Need part of initial word -- fetch it. */ | |
283 | buffer[0] = ptrace (PT_RIUSER, inferior_pid, | |
284 | (PTRACE_ARG3_TYPE) addr, 0, 0); | |
285 | } | |
286 | ||
287 | if (count > 1) /* FIXME, avoid if even boundary */ | |
288 | { | |
289 | buffer[count - 1] | |
290 | = ptrace (PT_RIUSER, inferior_pid, | |
291 | (PTRACE_ARG3_TYPE) (addr + (count - 1) * sizeof (int)), | |
292 | 0, 0); | |
293 | } | |
294 | ||
295 | /* Copy data to be written over corresponding part of buffer */ | |
296 | ||
297 | bcopy (myaddr, (char *) buffer + (memaddr & (sizeof (int) - 1)), len); | |
298 | ||
299 | /* Write the entire buffer. */ | |
300 | ||
301 | for (i = 0; i < count; i++, addr += sizeof (int)) | |
302 | { | |
303 | #if 0 | |
304 | /* The HP-UX kernel crashes if you use PT_WDUSER to write into the text | |
305 | segment. FIXME -- does it work to write into the data segment using | |
306 | WIUSER, or do these idiots really expect us to figure out which segment | |
307 | the address is in, so we can use a separate system call for it??! */ | |
308 | errno = 0; | |
309 | ptrace (PT_WDUSER, inferior_pid, (PTRACE_ARG3_TYPE) addr, | |
310 | buffer[i], 0); | |
311 | if (errno) | |
312 | #endif | |
313 | { | |
314 | /* Using the appropriate one (I or D) is necessary for | |
315 | Gould NP1, at least. */ | |
316 | errno = 0; | |
317 | ptrace (PT_WIUSER, inferior_pid, (PTRACE_ARG3_TYPE) addr, | |
318 | buffer[i], 0); | |
319 | } | |
320 | if (errno) | |
321 | return 0; | |
322 | } | |
323 | } | |
324 | else | |
325 | { | |
326 | /* Read all the longwords */ | |
327 | for (i = 0; i < count; i++, addr += sizeof (int)) | |
328 | { | |
329 | errno = 0; | |
330 | buffer[i] = ptrace (PT_RIUSER, inferior_pid, | |
331 | (PTRACE_ARG3_TYPE) addr, 0, 0); | |
332 | if (errno) | |
333 | return 0; | |
334 | QUIT; | |
335 | } | |
336 | ||
337 | /* Copy appropriate bytes out of the buffer. */ | |
338 | bcopy ((char *) buffer + (memaddr & (sizeof (int) - 1)), myaddr, len); | |
339 | } | |
340 | return len; | |
341 | } | |
342 |