1 /* Low level interface to ptrace, for the remote server for GDB.
2 Copyright 1986, 1987, 1993, 1994, 1995, 1999, 2000, 2001
3 Free Software Foundation, Inc.
5 This file is part of GDB.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
23 #include "<sys/wait.h>"
28 #include <sys/param.h>
32 #include <sys/ioctl.h>
36 /***************Begin MY defs*********************/
37 static char my_registers
[REGISTER_BYTES
];
38 char *registers
= my_registers
;
39 /***************End MY defs*********************/
41 #include <sys/ptrace.h>
42 #include <machine/reg.h>
45 extern char **sys_errlist
;
48 /* Start an inferior process and returns its pid.
49 ALLARGS is a vector of program-name and args. */
52 create_inferior (char *program
, char **allargs
)
58 perror_with_name ("fork");
62 ptrace (PTRACE_TRACEME
);
64 execv (program
, allargs
);
66 fprintf (stderr
, "Cannot exec %s: %s.\n", program
,
67 errno
< sys_nerr
? sys_errlist
[errno
] : "unknown error");
75 /* Kill the inferior process. Make us have no inferior. */
80 if (inferior_pid
== 0)
82 ptrace (8, inferior_pid
, 0, 0);
84 /*************inferior_died ();****VK**************/
87 /* Return nonzero if the given thread is still alive. */
89 mythread_alive (int pid
)
94 /* Wait for process, returns status */
103 if (pid
!= inferior_pid
)
104 perror_with_name ("wait");
108 fprintf (stderr
, "\nChild exited with retcode = %x \n", WEXITSTATUS (w
));
110 return ((unsigned char) WEXITSTATUS (w
));
112 else if (!WIFSTOPPED (w
))
114 fprintf (stderr
, "\nChild terminated with signal = %x \n", WTERMSIG (w
));
116 return ((unsigned char) WTERMSIG (w
));
119 fetch_inferior_registers (0);
122 return ((unsigned char) WSTOPSIG (w
));
125 /* Resume execution of the inferior process.
126 If STEP is nonzero, single-step it.
127 If SIGNAL is nonzero, give it that signal. */
130 myresume (int step
, int signal
)
133 ptrace (step
? PTRACE_SINGLESTEP
: PTRACE_CONT
, inferior_pid
, 1, signal
);
135 perror_with_name ("ptrace");
138 /* Fetch one or more registers from the inferior. REGNO == -1 to get
139 them all. We actually fetch more than requested, when convenient,
140 marking them as valid so we won't fetch them again. */
143 fetch_inferior_registers (int ignored
)
145 struct regs inferior_registers
;
146 struct fp_status inferior_fp_registers
;
148 ptrace (PTRACE_GETREGS
, inferior_pid
,
149 (PTRACE_ARG3_TYPE
) & inferior_registers
);
151 ptrace (PTRACE_GETFPREGS
, inferior_pid
,
152 (PTRACE_ARG3_TYPE
) & inferior_fp_registers
);
155 memcpy (registers
, &inferior_registers
, 16 * 4);
157 memcpy (®isters
[REGISTER_BYTE (FP0_REGNUM
)], &inferior_fp_registers
,
158 sizeof inferior_fp_registers
.fps_regs
);
160 *(int *) ®isters
[REGISTER_BYTE (PS_REGNUM
)] = inferior_registers
.r_ps
;
161 *(int *) ®isters
[REGISTER_BYTE (PC_REGNUM
)] = inferior_registers
.r_pc
;
164 (®isters
[REGISTER_BYTE (FPC_REGNUM
)],
165 &inferior_fp_registers
.fps_control
,
166 sizeof inferior_fp_registers
- sizeof inferior_fp_registers
.fps_regs
);
170 /* Store our register values back into the inferior.
171 If REGNO is -1, do this for all registers.
172 Otherwise, REGNO specifies which register (so we can save time). */
175 store_inferior_registers (int ignored
)
177 struct regs inferior_registers
;
178 struct fp_status inferior_fp_registers
;
180 memcpy (&inferior_registers
, registers
, 16 * 4);
182 memcpy (&inferior_fp_registers
,
183 ®isters
[REGISTER_BYTE (FP0_REGNUM
)],
184 sizeof inferior_fp_registers
.fps_regs
);
186 inferior_registers
.r_ps
= *(int *) ®isters
[REGISTER_BYTE (PS_REGNUM
)];
187 inferior_registers
.r_pc
= *(int *) ®isters
[REGISTER_BYTE (PC_REGNUM
)];
190 memcpy (&inferior_fp_registers
.fps_control
,
191 ®isters
[REGISTER_BYTE (FPC_REGNUM
)],
192 (sizeof inferior_fp_registers
193 - sizeof inferior_fp_registers
.fps_regs
));
196 ptrace (PTRACE_SETREGS
, inferior_pid
,
197 (PTRACE_ARG3_TYPE
) & inferior_registers
);
199 ptrace (PTRACE_SETFPREGS
, inferior_pid
,
200 (PTRACE_ARG3_TYPE
) & inferior_fp_registers
);
204 /* NOTE! I tried using PTRACE_READDATA, etc., to read and write memory
205 in the NEW_SUN_PTRACE case.
206 It ought to be straightforward. But it appears that writing did
207 not write the data that I specified. I cannot understand where
208 it got the data that it actually did write. */
210 /* Copy LEN bytes from inferior's memory starting at MEMADDR
211 to debugger memory starting at MYADDR. */
214 read_inferior_memory (CORE_ADDR memaddr
, char *myaddr
, int len
)
217 /* Round starting address down to longword boundary. */
218 register CORE_ADDR addr
= memaddr
& -sizeof (int);
219 /* Round ending address up; get number of longwords that makes. */
221 = (((memaddr
+ len
) - addr
) + sizeof (int) - 1) / sizeof (int);
222 /* Allocate buffer of that many longwords. */
223 register int *buffer
= (int *) alloca (count
* sizeof (int));
225 /* Read all the longwords */
226 for (i
= 0; i
< count
; i
++, addr
+= sizeof (int))
228 buffer
[i
] = ptrace (1, inferior_pid
, addr
, 0);
231 /* Copy appropriate bytes out of the buffer. */
232 memcpy (myaddr
, (char *) buffer
+ (memaddr
& (sizeof (int) - 1)), len
);
235 /* Copy LEN bytes of data from debugger memory at MYADDR
236 to inferior's memory at MEMADDR.
237 On failure (cannot write the inferior)
238 returns the value of errno. */
241 write_inferior_memory (CORE_ADDR memaddr
, char *myaddr
, int len
)
244 /* Round starting address down to longword boundary. */
245 register CORE_ADDR addr
= memaddr
& -sizeof (int);
246 /* Round ending address up; get number of longwords that makes. */
248 = (((memaddr
+ len
) - addr
) + sizeof (int) - 1) / sizeof (int);
249 /* Allocate buffer of that many longwords. */
250 register int *buffer
= (int *) alloca (count
* sizeof (int));
253 /* Fill start and end extra bytes of buffer with existing memory data. */
255 buffer
[0] = ptrace (1, inferior_pid
, addr
, 0);
260 = ptrace (1, inferior_pid
,
261 addr
+ (count
- 1) * sizeof (int), 0);
264 /* Copy data to be written over corresponding part of buffer */
266 memcpy ((char *) buffer
+ (memaddr
& (sizeof (int) - 1)), myaddr
, len
);
268 /* Write the entire buffer. */
270 for (i
= 0; i
< count
; i
++, addr
+= sizeof (int))
273 ptrace (4, inferior_pid
, addr
, buffer
[i
]);
282 initialize_low (void)