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>
51 extern char **environ
;
53 extern int inferior_pid
;
54 void error (), quit (), perror_with_name ();
57 /* Start an inferior process and returns its pid.
58 ALLARGS is a vector of program-name and args.
59 ENV is the environment vector to pass. */
62 create_inferior (program
, allargs
)
70 perror_with_name ("fork");
74 ptrace (PTRACE_TRACEME
);
76 execv (program
, allargs
);
78 fprintf (stderr
, "Cannot exec %s: %s.\n", program
,
79 errno
< sys_nerr
? sys_errlist
[errno
] : "unknown error");
87 /* Kill the inferior process. Make us have no inferior. */
92 if (inferior_pid
== 0)
94 ptrace (8, inferior_pid
, 0, 0);
96 /*************inferior_died ();****VK**************/
99 /* Wait for process, returns status */
109 if (pid
!= inferior_pid
)
110 perror_with_name ("wait");
114 fprintf (stderr
, "\nChild exited with retcode = %x \n", WEXITSTATUS (w
));
116 return ((unsigned char) WEXITSTATUS (w
));
118 else if (!WIFSTOPPED (w
))
120 fprintf (stderr
, "\nChild terminated with signal = %x \n", WTERMSIG (w
));
122 return ((unsigned char) WTERMSIG (w
));
125 fetch_inferior_registers (0);
128 return ((unsigned char) WSTOPSIG (w
));
131 /* Resume execution of the inferior process.
132 If STEP is nonzero, single-step it.
133 If SIGNAL is nonzero, give it that signal. */
136 myresume (step
, signal
)
141 ptrace (step
? PTRACE_SINGLESTEP
: PTRACE_CONT
, inferior_pid
, 1, signal
);
143 perror_with_name ("ptrace");
146 /* Fetch one or more registers from the inferior. REGNO == -1 to get
147 them all. We actually fetch more than requested, when convenient,
148 marking them as valid so we won't fetch them again. */
151 fetch_inferior_registers (ignored
)
154 struct regs inferior_registers
;
155 struct fp_status inferior_fp_registers
;
158 /* Global and Out regs are fetched directly, as well as the control
159 registers. If we're getting one of the in or local regs,
160 and the stack pointer has not yet been fetched,
161 we have to do that first, since they're found in memory relative
162 to the stack pointer. */
164 if (ptrace (PTRACE_GETREGS
, inferior_pid
,
165 (PTRACE_ARG3_TYPE
) &inferior_registers
, 0))
166 perror("ptrace_getregs");
168 registers
[REGISTER_BYTE (0)] = 0;
169 memcpy (®isters
[REGISTER_BYTE (1)], &inferior_registers
.r_g1
,
170 15 * REGISTER_RAW_SIZE (G0_REGNUM
));
171 *(int *)®isters
[REGISTER_BYTE (PS_REGNUM
)] = inferior_registers
.r_ps
;
172 *(int *)®isters
[REGISTER_BYTE (PC_REGNUM
)] = inferior_registers
.r_pc
;
173 *(int *)®isters
[REGISTER_BYTE (NPC_REGNUM
)] = inferior_registers
.r_npc
;
174 *(int *)®isters
[REGISTER_BYTE (Y_REGNUM
)] = inferior_registers
.r_y
;
176 /* Floating point registers */
178 if (ptrace (PTRACE_GETFPREGS
, inferior_pid
,
179 (PTRACE_ARG3_TYPE
) &inferior_fp_registers
,
181 perror("ptrace_getfpregs");
182 memcpy (®isters
[REGISTER_BYTE (FP0_REGNUM
)], &inferior_fp_registers
,
183 sizeof inferior_fp_registers
.fpu_fr
);
185 /* These regs are saved on the stack by the kernel. Only read them
186 all (16 ptrace calls!) if we really need them. */
188 read_inferior_memory (*(CORE_ADDR
*)®isters
[REGISTER_BYTE (SP_REGNUM
)],
189 ®isters
[REGISTER_BYTE (L0_REGNUM
)],
190 16*REGISTER_RAW_SIZE (L0_REGNUM
));
193 /* Store our register values back into the inferior.
194 If REGNO is -1, do this for all registers.
195 Otherwise, REGNO specifies which register (so we can save time). */
198 store_inferior_registers (ignored
)
201 struct regs inferior_registers
;
202 struct fp_status inferior_fp_registers
;
203 CORE_ADDR sp
= *(CORE_ADDR
*)®isters
[REGISTER_BYTE (SP_REGNUM
)];
205 write_inferior_memory (sp
, ®isters
[REGISTER_BYTE (L0_REGNUM
)],
206 16*REGISTER_RAW_SIZE (L0_REGNUM
));
208 memcpy (&inferior_registers
.r_g1
, ®isters
[REGISTER_BYTE (G1_REGNUM
)],
209 15 * REGISTER_RAW_SIZE (G1_REGNUM
));
211 inferior_registers
.r_ps
=
212 *(int *)®isters
[REGISTER_BYTE (PS_REGNUM
)];
213 inferior_registers
.r_pc
=
214 *(int *)®isters
[REGISTER_BYTE (PC_REGNUM
)];
215 inferior_registers
.r_npc
=
216 *(int *)®isters
[REGISTER_BYTE (NPC_REGNUM
)];
217 inferior_registers
.r_y
=
218 *(int *)®isters
[REGISTER_BYTE (Y_REGNUM
)];
220 if (ptrace (PTRACE_SETREGS
, inferior_pid
,
221 (PTRACE_ARG3_TYPE
) &inferior_registers
, 0))
222 perror("ptrace_setregs");
224 memcpy (&inferior_fp_registers
, ®isters
[REGISTER_BYTE (FP0_REGNUM
)],
225 sizeof inferior_fp_registers
.fpu_fr
);
227 if (ptrace (PTRACE_SETFPREGS
, inferior_pid
,
228 (PTRACE_ARG3_TYPE
) &inferior_fp_registers
, 0))
229 perror("ptrace_setfpregs");
232 /* NOTE! I tried using PTRACE_READDATA, etc., to read and write memory
233 in the NEW_SUN_PTRACE case.
234 It ought to be straightforward. But it appears that writing did
235 not write the data that I specified. I cannot understand where
236 it got the data that it actually did write. */
238 /* Copy LEN bytes from inferior's memory starting at MEMADDR
239 to debugger memory starting at MYADDR. */
241 read_inferior_memory (memaddr
, myaddr
, len
)
247 /* Round starting address down to longword boundary. */
248 register CORE_ADDR addr
= memaddr
& -sizeof (int);
249 /* Round ending address up; get number of longwords that makes. */
251 = (((memaddr
+ len
) - addr
) + sizeof (int) - 1) / sizeof (int);
252 /* Allocate buffer of that many longwords. */
253 register int *buffer
= (int *) alloca (count
* sizeof (int));
255 /* Read all the longwords */
256 for (i
= 0; i
< count
; i
++, addr
+= sizeof (int))
258 buffer
[i
] = ptrace (1, inferior_pid
, addr
, 0);
261 /* Copy appropriate bytes out of the buffer. */
262 bcopy ((char *) buffer
+ (memaddr
& (sizeof (int) - 1)), myaddr
, len
);
265 /* Copy LEN bytes of data from debugger memory at MYADDR
266 to inferior's memory at MEMADDR.
267 On failure (cannot write the inferior)
268 returns the value of errno. */
271 write_inferior_memory (memaddr
, myaddr
, len
)
277 /* Round starting address down to longword boundary. */
278 register CORE_ADDR addr
= memaddr
& -sizeof (int);
279 /* Round ending address up; get number of longwords that makes. */
281 = (((memaddr
+ len
) - addr
) + sizeof (int) - 1) / sizeof (int);
282 /* Allocate buffer of that many longwords. */
283 register int *buffer
= (int *) alloca (count
* sizeof (int));
286 /* Fill start and end extra bytes of buffer with existing memory data. */
288 buffer
[0] = ptrace (1, inferior_pid
, addr
, 0);
293 = ptrace (1, inferior_pid
,
294 addr
+ (count
- 1) * sizeof (int), 0);
297 /* Copy data to be written over corresponding part of buffer */
299 bcopy (myaddr
, (char *) buffer
+ (memaddr
& (sizeof (int) - 1)), len
);
301 /* Write the entire buffer. */
303 for (i
= 0; i
< count
; i
++, addr
+= sizeof (int))
306 ptrace (4, inferior_pid
, addr
, buffer
[i
]);
323 return inferior_pid
!= 0;