1 /* Low level interface to ptrace, for the remote server for GDB.
2 Copyright (C) 1986, 1987, 1993 Free Software Foundation, Inc.
4 This file is part of GDB.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
22 #include "<sys/wait.h>"
27 #include <sys/param.h>
31 #include <sys/ioctl.h>
35 /***************Begin MY defs*********************/
37 static char my_registers
[REGISTER_BYTES
];
38 char *registers
= my_registers
;
40 /* Index within `registers' of the first byte of the space for
44 char buf2
[MAX_REGISTER_RAW_SIZE
];
45 /***************End MY defs*********************/
47 #include <sys/ptrace.h>
48 #include <machine/reg.h>
51 extern char **sys_errlist
;
52 extern char **environ
;
54 extern int inferior_pid
;
55 void quit (), perror_with_name ();
58 /* Start an inferior process and returns its pid.
59 ALLARGS is a vector of program-name and args.
60 ENV is the environment vector to pass. */
63 create_inferior (program
, allargs
)
71 perror_with_name ("fork");
75 ptrace (PTRACE_TRACEME
);
77 execv (program
, allargs
);
79 fprintf (stderr
, "Cannot exec %s: %s.\n", program
,
80 errno
< sys_nerr
? sys_errlist
[errno
] : "unknown error");
88 /* Kill the inferior process. Make us have no inferior. */
93 if (inferior_pid
== 0)
95 ptrace (8, inferior_pid
, 0, 0);
97 /*************inferior_died ();****VK**************/
100 /* Return nonzero if the given thread is still alive. */
108 /* Wait for process, returns status */
118 if (pid
!= inferior_pid
)
119 perror_with_name ("wait");
123 fprintf (stderr
, "\nChild exited with retcode = %x \n", WEXITSTATUS (w
));
125 return ((unsigned char) WEXITSTATUS (w
));
127 else if (!WIFSTOPPED (w
))
129 fprintf (stderr
, "\nChild terminated with signal = %x \n", WTERMSIG (w
));
131 return ((unsigned char) WTERMSIG (w
));
134 fetch_inferior_registers (0);
137 return ((unsigned char) WSTOPSIG (w
));
140 /* Resume execution of the inferior process.
141 If STEP is nonzero, single-step it.
142 If SIGNAL is nonzero, give it that signal. */
145 myresume (step
, signal
)
150 ptrace (step
? PTRACE_SINGLESTEP
: PTRACE_CONT
, inferior_pid
, 1, signal
);
152 perror_with_name ("ptrace");
155 /* Fetch one or more registers from the inferior. REGNO == -1 to get
156 them all. We actually fetch more than requested, when convenient,
157 marking them as valid so we won't fetch them again. */
160 fetch_inferior_registers (ignored
)
163 struct regs inferior_registers
;
164 struct fp_status inferior_fp_registers
;
166 ptrace (PTRACE_GETREGS
, inferior_pid
,
167 (PTRACE_ARG3_TYPE
) & inferior_registers
);
169 ptrace (PTRACE_GETFPREGS
, inferior_pid
,
170 (PTRACE_ARG3_TYPE
) & inferior_fp_registers
);
173 memcpy (registers
, &inferior_registers
, 16 * 4);
175 memcpy (®isters
[REGISTER_BYTE (FP0_REGNUM
)], &inferior_fp_registers
,
176 sizeof inferior_fp_registers
.fps_regs
);
178 *(int *) ®isters
[REGISTER_BYTE (PS_REGNUM
)] = inferior_registers
.r_ps
;
179 *(int *) ®isters
[REGISTER_BYTE (PC_REGNUM
)] = inferior_registers
.r_pc
;
182 (®isters
[REGISTER_BYTE (FPC_REGNUM
)],
183 &inferior_fp_registers
.fps_control
,
184 sizeof inferior_fp_registers
- sizeof inferior_fp_registers
.fps_regs
);
188 /* Store our register values back into the inferior.
189 If REGNO is -1, do this for all registers.
190 Otherwise, REGNO specifies which register (so we can save time). */
193 store_inferior_registers (ignored
)
196 struct regs inferior_registers
;
197 struct fp_status inferior_fp_registers
;
199 memcpy (&inferior_registers
, registers
, 16 * 4);
201 memcpy (&inferior_fp_registers
,
202 ®isters
[REGISTER_BYTE (FP0_REGNUM
)],
203 sizeof inferior_fp_registers
.fps_regs
);
205 inferior_registers
.r_ps
= *(int *) ®isters
[REGISTER_BYTE (PS_REGNUM
)];
206 inferior_registers
.r_pc
= *(int *) ®isters
[REGISTER_BYTE (PC_REGNUM
)];
209 memcpy (&inferior_fp_registers
.fps_control
,
210 ®isters
[REGISTER_BYTE (FPC_REGNUM
)],
211 (sizeof inferior_fp_registers
212 - sizeof inferior_fp_registers
.fps_regs
));
215 ptrace (PTRACE_SETREGS
, inferior_pid
,
216 (PTRACE_ARG3_TYPE
) & inferior_registers
);
218 ptrace (PTRACE_SETFPREGS
, inferior_pid
,
219 (PTRACE_ARG3_TYPE
) & inferior_fp_registers
);
223 /* NOTE! I tried using PTRACE_READDATA, etc., to read and write memory
224 in the NEW_SUN_PTRACE case.
225 It ought to be straightforward. But it appears that writing did
226 not write the data that I specified. I cannot understand where
227 it got the data that it actually did write. */
229 /* Copy LEN bytes from inferior's memory starting at MEMADDR
230 to debugger memory starting at MYADDR. */
232 read_inferior_memory (memaddr
, myaddr
, len
)
238 /* Round starting address down to longword boundary. */
239 register CORE_ADDR addr
= memaddr
& -sizeof (int);
240 /* Round ending address up; get number of longwords that makes. */
242 = (((memaddr
+ len
) - addr
) + sizeof (int) - 1) / sizeof (int);
243 /* Allocate buffer of that many longwords. */
244 register int *buffer
= (int *) alloca (count
* sizeof (int));
246 /* Read all the longwords */
247 for (i
= 0; i
< count
; i
++, addr
+= sizeof (int))
249 buffer
[i
] = ptrace (1, inferior_pid
, addr
, 0);
252 /* Copy appropriate bytes out of the buffer. */
253 memcpy (myaddr
, (char *) buffer
+ (memaddr
& (sizeof (int) - 1)), len
);
256 /* Copy LEN bytes of data from debugger memory at MYADDR
257 to inferior's memory at MEMADDR.
258 On failure (cannot write the inferior)
259 returns the value of errno. */
262 write_inferior_memory (memaddr
, myaddr
, len
)
268 /* Round starting address down to longword boundary. */
269 register CORE_ADDR addr
= memaddr
& -sizeof (int);
270 /* Round ending address up; get number of longwords that makes. */
272 = (((memaddr
+ len
) - addr
) + sizeof (int) - 1) / sizeof (int);
273 /* Allocate buffer of that many longwords. */
274 register int *buffer
= (int *) alloca (count
* sizeof (int));
277 /* Fill start and end extra bytes of buffer with existing memory data. */
279 buffer
[0] = ptrace (1, inferior_pid
, addr
, 0);
284 = ptrace (1, inferior_pid
,
285 addr
+ (count
- 1) * sizeof (int), 0);
288 /* Copy data to be written over corresponding part of buffer */
290 memcpy ((char *) buffer
+ (memaddr
& (sizeof (int) - 1)), myaddr
, len
);
292 /* Write the entire buffer. */
294 for (i
= 0; i
< count
; i
++, addr
+= sizeof (int))
297 ptrace (4, inferior_pid
, addr
, buffer
[i
]);