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., 675 Mass Ave, Cambridge, MA 02139, USA. */
21 #include "/usr/include/sys/wait.h"
24 /***************************
25 #include "initialize.h"
26 ****************************/
29 #include <sys/param.h>
33 #include <sys/ioctl.h>
37 /***************Begin MY defs*********************/
39 char registers
[REGISTER_BYTES
];
41 /* Index within `registers' of the first byte of the space for
45 char buf2
[MAX_REGISTER_RAW_SIZE
];
46 /***************End MY defs*********************/
48 #include <sys/ptrace.h>
49 #include <machine/reg.h>
52 extern char **sys_errlist
;
53 extern char **environ
;
55 extern int inferior_pid
;
56 void error (), quit (), perror_with_name ();
59 /* Start an inferior process and returns its pid.
60 ALLARGS is a vector of program-name and args.
61 ENV is the environment vector to pass. */
64 create_inferior (program
, allargs
)
72 perror_with_name ("fork");
76 ptrace (PTRACE_TRACEME
);
78 execv (program
, allargs
);
80 fprintf (stderr
, "Cannot exec %s: %s.\n", program
,
81 errno
< sys_nerr
? sys_errlist
[errno
] : "unknown error");
89 /* Kill the inferior process. Make us have no inferior. */
94 if (inferior_pid
== 0)
96 ptrace (8, inferior_pid
, 0, 0);
98 /*************inferior_died ();****VK**************/
101 /* Wait for process, returns status */
111 if (pid
!= inferior_pid
)
112 perror_with_name ("wait");
116 fprintf (stderr
, "\nChild exited with retcode = %x \n", WEXITSTATUS (w
));
118 return ((unsigned char) WEXITSTATUS (w
));
120 else if (!WIFSTOPPED (w
))
122 fprintf (stderr
, "\nChild terminated with signal = %x \n", WTERMSIG (w
));
124 return ((unsigned char) WTERMSIG (w
));
127 fetch_inferior_registers (0);
130 return ((unsigned char) WSTOPSIG (w
));
133 /* Resume execution of the inferior process.
134 If STEP is nonzero, single-step it.
135 If SIGNAL is nonzero, give it that signal. */
138 myresume (step
, signal
)
143 ptrace (step
? PTRACE_SINGLESTEP
: PTRACE_CONT
, inferior_pid
, 1, signal
);
145 perror_with_name ("ptrace");
148 /* Fetch one or more registers from the inferior. REGNO == -1 to get
149 them all. We actually fetch more than requested, when convenient,
150 marking them as valid so we won't fetch them again. */
153 fetch_inferior_registers (ignored
)
156 struct regs inferior_registers
;
157 struct fp_status inferior_fp_registers
;
160 /* Global and Out regs are fetched directly, as well as the control
161 registers. If we're getting one of the in or local regs,
162 and the stack pointer has not yet been fetched,
163 we have to do that first, since they're found in memory relative
164 to the stack pointer. */
166 if (ptrace (PTRACE_GETREGS
, inferior_pid
,
167 (PTRACE_ARG3_TYPE
) &inferior_registers
, 0))
168 perror("ptrace_getregs");
170 registers
[REGISTER_BYTE (0)] = 0;
171 memcpy (®isters
[REGISTER_BYTE (1)], &inferior_registers
.r_g1
,
172 15 * REGISTER_RAW_SIZE (G0_REGNUM
));
173 *(int *)®isters
[REGISTER_BYTE (PS_REGNUM
)] = inferior_registers
.r_ps
;
174 *(int *)®isters
[REGISTER_BYTE (PC_REGNUM
)] = inferior_registers
.r_pc
;
175 *(int *)®isters
[REGISTER_BYTE (NPC_REGNUM
)] = inferior_registers
.r_npc
;
176 *(int *)®isters
[REGISTER_BYTE (Y_REGNUM
)] = inferior_registers
.r_y
;
178 /* Floating point registers */
180 if (ptrace (PTRACE_GETFPREGS
, inferior_pid
,
181 (PTRACE_ARG3_TYPE
) &inferior_fp_registers
,
183 perror("ptrace_getfpregs");
184 memcpy (®isters
[REGISTER_BYTE (FP0_REGNUM
)], &inferior_fp_registers
,
185 sizeof inferior_fp_registers
.fpu_fr
);
187 /* These regs are saved on the stack by the kernel. Only read them
188 all (16 ptrace calls!) if we really need them. */
190 read_inferior_memory (*(CORE_ADDR
*)®isters
[REGISTER_BYTE (SP_REGNUM
)],
191 ®isters
[REGISTER_BYTE (L0_REGNUM
)],
192 16*REGISTER_RAW_SIZE (L0_REGNUM
));
195 /* Store our register values back into the inferior.
196 If REGNO is -1, do this for all registers.
197 Otherwise, REGNO specifies which register (so we can save time). */
200 store_inferior_registers (ignored
)
203 struct regs inferior_registers
;
204 struct fp_status inferior_fp_registers
;
205 CORE_ADDR sp
= *(CORE_ADDR
*)®isters
[REGISTER_BYTE (SP_REGNUM
)];
207 write_inferior_memory (sp
, ®isters
[REGISTER_BYTE (L0_REGNUM
)],
208 16*REGISTER_RAW_SIZE (L0_REGNUM
));
210 memcpy (&inferior_registers
.r_g1
, ®isters
[REGISTER_BYTE (G1_REGNUM
)],
211 15 * REGISTER_RAW_SIZE (G1_REGNUM
));
213 inferior_registers
.r_ps
=
214 *(int *)®isters
[REGISTER_BYTE (PS_REGNUM
)];
215 inferior_registers
.r_pc
=
216 *(int *)®isters
[REGISTER_BYTE (PC_REGNUM
)];
217 inferior_registers
.r_npc
=
218 *(int *)®isters
[REGISTER_BYTE (NPC_REGNUM
)];
219 inferior_registers
.r_y
=
220 *(int *)®isters
[REGISTER_BYTE (Y_REGNUM
)];
222 if (ptrace (PTRACE_SETREGS
, inferior_pid
,
223 (PTRACE_ARG3_TYPE
) &inferior_registers
, 0))
224 perror("ptrace_setregs");
226 memcpy (&inferior_fp_registers
, ®isters
[REGISTER_BYTE (FP0_REGNUM
)],
227 sizeof inferior_fp_registers
.fpu_fr
);
229 if (ptrace (PTRACE_SETFPREGS
, inferior_pid
,
230 (PTRACE_ARG3_TYPE
) &inferior_fp_registers
, 0))
231 perror("ptrace_setfpregs");
234 /* NOTE! I tried using PTRACE_READDATA, etc., to read and write memory
235 in the NEW_SUN_PTRACE case.
236 It ought to be straightforward. But it appears that writing did
237 not write the data that I specified. I cannot understand where
238 it got the data that it actually did write. */
240 /* Copy LEN bytes from inferior's memory starting at MEMADDR
241 to debugger memory starting at MYADDR. */
243 read_inferior_memory (memaddr
, myaddr
, len
)
249 /* Round starting address down to longword boundary. */
250 register CORE_ADDR addr
= memaddr
& -sizeof (int);
251 /* Round ending address up; get number of longwords that makes. */
253 = (((memaddr
+ len
) - addr
) + sizeof (int) - 1) / sizeof (int);
254 /* Allocate buffer of that many longwords. */
255 register int *buffer
= (int *) alloca (count
* sizeof (int));
257 /* Read all the longwords */
258 for (i
= 0; i
< count
; i
++, addr
+= sizeof (int))
260 buffer
[i
] = ptrace (1, inferior_pid
, addr
, 0);
263 /* Copy appropriate bytes out of the buffer. */
264 memcpy (myaddr
, (char *) buffer
+ (memaddr
& (sizeof (int) - 1)), len
);
267 /* Copy LEN bytes of data from debugger memory at MYADDR
268 to inferior's memory at MEMADDR.
269 On failure (cannot write the inferior)
270 returns the value of errno. */
273 write_inferior_memory (memaddr
, myaddr
, len
)
279 /* Round starting address down to longword boundary. */
280 register CORE_ADDR addr
= memaddr
& -sizeof (int);
281 /* Round ending address up; get number of longwords that makes. */
283 = (((memaddr
+ len
) - addr
) + sizeof (int) - 1) / sizeof (int);
284 /* Allocate buffer of that many longwords. */
285 register int *buffer
= (int *) alloca (count
* sizeof (int));
288 /* Fill start and end extra bytes of buffer with existing memory data. */
290 buffer
[0] = ptrace (1, inferior_pid
, addr
, 0);
295 = ptrace (1, inferior_pid
,
296 addr
+ (count
- 1) * sizeof (int), 0);
299 /* Copy data to be written over corresponding part of buffer */
301 bcopy (myaddr
, (char *) buffer
+ (memaddr
& (sizeof (int) - 1)), len
);
303 /* Write the entire buffer. */
305 for (i
= 0; i
< count
; i
++, addr
+= sizeof (int))
308 ptrace (4, inferior_pid
, addr
, buffer
[i
]);
325 return inferior_pid
!= 0;