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. */
25 /***************************
26 #include "initialize.h"
27 ****************************/
30 #include <sys/param.h>
34 #include <sys/ioctl.h>
38 /***************Begin MY defs*********************/
39 static char my_registers
[REGISTER_BYTES
];
40 char *registers
= my_registers
;
41 /***************End MY defs*********************/
43 #include <sys/ptrace.h>
47 extern char **sys_errlist
;
50 /* Start an inferior process and returns its pid.
51 ALLARGS is a vector of program-name and args. */
54 create_inferior (char *program
, char **allargs
)
60 perror_with_name ("fork");
64 ptrace (PTRACE_TRACEME
);
66 execv (program
, allargs
);
68 fprintf (stderr
, "Cannot exec %s: %s.\n", program
,
69 errno
< sys_nerr
? sys_errlist
[errno
] : "unknown error");
77 /* Kill the inferior process. Make us have no inferior. */
82 if (inferior_pid
== 0)
84 ptrace (8, inferior_pid
, 0, 0);
86 /*************inferior_died ();****VK**************/
89 /* Return nonzero if the given thread is still alive. */
91 mythread_alive (int pid
)
96 /* Wait for process, returns status */
105 if (pid
!= inferior_pid
)
106 perror_with_name ("wait");
110 fprintf (stderr
, "\nChild exited with retcode = %x \n", WEXITSTATUS (w
));
112 return ((unsigned char) WEXITSTATUS (w
));
114 else if (!WIFSTOPPED (w
))
116 fprintf (stderr
, "\nChild terminated with signal = %x \n", WTERMSIG (w
));
118 return ((unsigned char) WTERMSIG (w
));
121 fetch_inferior_registers (0);
124 return ((unsigned char) WSTOPSIG (w
));
127 /* Resume execution of the inferior process.
128 If STEP is nonzero, single-step it.
129 If SIGNAL is nonzero, give it that signal. */
132 myresume (int step
, int signal
)
135 ptrace (step
? PTRACE_SINGLESTEP
: PTRACE_CONT
, inferior_pid
, 1, signal
);
137 perror_with_name ("ptrace");
140 /* Fetch one or more registers from the inferior. REGNO == -1 to get
141 them all. We actually fetch more than requested, when convenient,
142 marking them as valid so we won't fetch them again. */
145 fetch_inferior_registers (int ignored
)
147 struct regs inferior_registers
;
148 struct fp_status inferior_fp_registers
;
151 /* Global and Out regs are fetched directly, as well as the control
152 registers. If we're getting one of the in or local regs,
153 and the stack pointer has not yet been fetched,
154 we have to do that first, since they're found in memory relative
155 to the stack pointer. */
157 if (ptrace (PTRACE_GETREGS
, inferior_pid
,
158 (PTRACE_ARG3_TYPE
) & inferior_registers
, 0))
159 perror ("ptrace_getregs");
161 registers
[REGISTER_BYTE (0)] = 0;
162 memcpy (®isters
[REGISTER_BYTE (1)], &inferior_registers
.r_g1
,
163 15 * REGISTER_RAW_SIZE (G0_REGNUM
));
164 *(int *) ®isters
[REGISTER_BYTE (PS_REGNUM
)] = inferior_registers
.r_ps
;
165 *(int *) ®isters
[REGISTER_BYTE (PC_REGNUM
)] = inferior_registers
.r_pc
;
166 *(int *) ®isters
[REGISTER_BYTE (NPC_REGNUM
)] = inferior_registers
.r_npc
;
167 *(int *) ®isters
[REGISTER_BYTE (Y_REGNUM
)] = inferior_registers
.r_y
;
169 /* Floating point registers */
171 if (ptrace (PTRACE_GETFPREGS
, inferior_pid
,
172 (PTRACE_ARG3_TYPE
) & inferior_fp_registers
,
174 perror ("ptrace_getfpregs");
175 memcpy (®isters
[REGISTER_BYTE (FP0_REGNUM
)], &inferior_fp_registers
,
176 sizeof inferior_fp_registers
.fpu_fr
);
178 /* These regs are saved on the stack by the kernel. Only read them
179 all (16 ptrace calls!) if we really need them. */
181 read_inferior_memory (*(CORE_ADDR
*) & registers
[REGISTER_BYTE (SP_REGNUM
)],
182 ®isters
[REGISTER_BYTE (L0_REGNUM
)],
183 16 * REGISTER_RAW_SIZE (L0_REGNUM
));
186 /* Store our register values back into the inferior.
187 If REGNO is -1, do this for all registers.
188 Otherwise, REGNO specifies which register (so we can save time). */
191 store_inferior_registers (int ignored
)
193 struct regs inferior_registers
;
194 struct fp_status inferior_fp_registers
;
195 CORE_ADDR sp
= *(CORE_ADDR
*) & registers
[REGISTER_BYTE (SP_REGNUM
)];
197 write_inferior_memory (sp
, ®isters
[REGISTER_BYTE (L0_REGNUM
)],
198 16 * REGISTER_RAW_SIZE (L0_REGNUM
));
200 memcpy (&inferior_registers
.r_g1
, ®isters
[REGISTER_BYTE (G1_REGNUM
)],
201 15 * REGISTER_RAW_SIZE (G1_REGNUM
));
203 inferior_registers
.r_ps
=
204 *(int *) ®isters
[REGISTER_BYTE (PS_REGNUM
)];
205 inferior_registers
.r_pc
=
206 *(int *) ®isters
[REGISTER_BYTE (PC_REGNUM
)];
207 inferior_registers
.r_npc
=
208 *(int *) ®isters
[REGISTER_BYTE (NPC_REGNUM
)];
209 inferior_registers
.r_y
=
210 *(int *) ®isters
[REGISTER_BYTE (Y_REGNUM
)];
212 if (ptrace (PTRACE_SETREGS
, inferior_pid
,
213 (PTRACE_ARG3_TYPE
) & inferior_registers
, 0))
214 perror ("ptrace_setregs");
216 memcpy (&inferior_fp_registers
, ®isters
[REGISTER_BYTE (FP0_REGNUM
)],
217 sizeof inferior_fp_registers
.fpu_fr
);
219 if (ptrace (PTRACE_SETFPREGS
, inferior_pid
,
220 (PTRACE_ARG3_TYPE
) & inferior_fp_registers
, 0))
221 perror ("ptrace_setfpregs");
224 /* NOTE! I tried using PTRACE_READDATA, etc., to read and write memory
225 in the NEW_SUN_PTRACE case.
226 It ought to be straightforward. But it appears that writing did
227 not write the data that I specified. I cannot understand where
228 it got the data that it actually did write. */
230 /* Copy LEN bytes from inferior's memory starting at MEMADDR
231 to debugger memory starting at MYADDR. */
233 read_inferior_memory (CORE_ADDR memaddr
, char *myaddr
, int len
)
236 /* Round starting address down to longword boundary. */
237 register CORE_ADDR addr
= memaddr
& -sizeof (int);
238 /* Round ending address up; get number of longwords that makes. */
240 = (((memaddr
+ len
) - addr
) + sizeof (int) - 1) / sizeof (int);
241 /* Allocate buffer of that many longwords. */
242 register int *buffer
= (int *) alloca (count
* sizeof (int));
244 /* Read all the longwords */
245 for (i
= 0; i
< count
; i
++, addr
+= sizeof (int))
247 buffer
[i
] = ptrace (1, inferior_pid
, addr
, 0);
250 /* Copy appropriate bytes out of the buffer. */
251 memcpy (myaddr
, (char *) buffer
+ (memaddr
& (sizeof (int) - 1)), len
);
254 /* Copy LEN bytes of data from debugger memory at MYADDR
255 to inferior's memory at MEMADDR.
256 On failure (cannot write the inferior)
257 returns the value of errno. */
260 write_inferior_memory (CORE_ADDR memaddr
, char *myaddr
, int len
)
263 /* Round starting address down to longword boundary. */
264 register CORE_ADDR addr
= memaddr
& -sizeof (int);
265 /* Round ending address up; get number of longwords that makes. */
267 = (((memaddr
+ len
) - addr
) + sizeof (int) - 1) / sizeof (int);
268 /* Allocate buffer of that many longwords. */
269 register int *buffer
= (int *) alloca (count
* sizeof (int));
272 /* Fill start and end extra bytes of buffer with existing memory data. */
274 buffer
[0] = ptrace (1, inferior_pid
, addr
, 0);
279 = ptrace (1, inferior_pid
,
280 addr
+ (count
- 1) * sizeof (int), 0);
283 /* Copy data to be written over corresponding part of buffer */
285 bcopy (myaddr
, (char *) buffer
+ (memaddr
& (sizeof (int) - 1)), len
);
287 /* Write the entire buffer. */
289 for (i
= 0; i
< count
; i
++, addr
+= sizeof (int))
292 ptrace (4, inferior_pid
, addr
, buffer
[i
]);
301 initialize_low (void)