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*********************/
36 static char my_registers
[REGISTER_BYTES
];
37 char *registers
= my_registers
;
38 /***************End MY defs*********************/
40 #include <sys/ptrace.h>
41 #include <machine/reg.h>
44 extern char **sys_errlist
;
47 /* Start an inferior process and returns its pid.
48 ALLARGS is a vector of program-name and args. */
51 create_inferior (char *program
, char **allargs
)
57 perror_with_name ("fork");
61 ptrace (PTRACE_TRACEME
);
63 execv (program
, allargs
);
65 fprintf (stderr
, "Cannot exec %s: %s.\n", program
,
66 errno
< sys_nerr
? sys_errlist
[errno
] : "unknown error");
74 /* Kill the inferior process. Make us have no inferior. */
79 if (inferior_pid
== 0)
81 ptrace (8, inferior_pid
, 0, 0);
83 /*************inferior_died ();****VK**************/
86 /* Return nonzero if the given thread is still alive. */
88 mythread_alive (int pid
)
93 /* Wait for process, returns status */
102 if (pid
!= inferior_pid
)
103 perror_with_name ("wait");
107 fprintf (stderr
, "\nChild exited with retcode = %x \n", WEXITSTATUS (w
));
109 return ((unsigned char) WEXITSTATUS (w
));
111 else if (!WIFSTOPPED (w
))
113 fprintf (stderr
, "\nChild terminated with signal = %x \n", WTERMSIG (w
));
115 return ((unsigned char) WTERMSIG (w
));
118 fetch_inferior_registers (0);
121 return ((unsigned char) WSTOPSIG (w
));
124 /* Resume execution of the inferior process.
125 If STEP is nonzero, single-step it.
126 If SIGNAL is nonzero, give it that signal. */
129 myresume (int step
, int signal
)
132 ptrace (step
? PTRACE_SINGLESTEP
: PTRACE_CONT
, inferior_pid
, 1, signal
);
134 perror_with_name ("ptrace");
137 /* Fetch one or more registers from the inferior. REGNO == -1 to get
138 them all. We actually fetch more than requested, when convenient,
139 marking them as valid so we won't fetch them again. */
142 fetch_inferior_registers (int ignored
)
144 struct regs inferior_registers
;
145 struct fp_status inferior_fp_registers
;
147 ptrace (PTRACE_GETREGS
, inferior_pid
,
148 (PTRACE_ARG3_TYPE
) & inferior_registers
);
150 ptrace (PTRACE_GETFPREGS
, inferior_pid
,
151 (PTRACE_ARG3_TYPE
) & inferior_fp_registers
);
154 memcpy (registers
, &inferior_registers
, 16 * 4);
156 memcpy (®isters
[REGISTER_BYTE (FP0_REGNUM
)], &inferior_fp_registers
,
157 sizeof inferior_fp_registers
.fps_regs
);
159 *(int *) ®isters
[REGISTER_BYTE (PS_REGNUM
)] = inferior_registers
.r_ps
;
160 *(int *) ®isters
[REGISTER_BYTE (PC_REGNUM
)] = inferior_registers
.r_pc
;
163 (®isters
[REGISTER_BYTE (FPC_REGNUM
)],
164 &inferior_fp_registers
.fps_control
,
165 sizeof inferior_fp_registers
- sizeof inferior_fp_registers
.fps_regs
);
169 /* Store our register values back into the inferior.
170 If REGNO is -1, do this for all registers.
171 Otherwise, REGNO specifies which register (so we can save time). */
174 store_inferior_registers (int ignored
)
176 struct regs inferior_registers
;
177 struct fp_status inferior_fp_registers
;
179 memcpy (&inferior_registers
, registers
, 16 * 4);
181 memcpy (&inferior_fp_registers
,
182 ®isters
[REGISTER_BYTE (FP0_REGNUM
)],
183 sizeof inferior_fp_registers
.fps_regs
);
185 inferior_registers
.r_ps
= *(int *) ®isters
[REGISTER_BYTE (PS_REGNUM
)];
186 inferior_registers
.r_pc
= *(int *) ®isters
[REGISTER_BYTE (PC_REGNUM
)];
189 memcpy (&inferior_fp_registers
.fps_control
,
190 ®isters
[REGISTER_BYTE (FPC_REGNUM
)],
191 (sizeof inferior_fp_registers
192 - sizeof inferior_fp_registers
.fps_regs
));
195 ptrace (PTRACE_SETREGS
, inferior_pid
,
196 (PTRACE_ARG3_TYPE
) & inferior_registers
);
198 ptrace (PTRACE_SETFPREGS
, inferior_pid
,
199 (PTRACE_ARG3_TYPE
) & inferior_fp_registers
);
203 /* NOTE! I tried using PTRACE_READDATA, etc., to read and write memory
204 in the NEW_SUN_PTRACE case.
205 It ought to be straightforward. But it appears that writing did
206 not write the data that I specified. I cannot understand where
207 it got the data that it actually did write. */
209 /* Copy LEN bytes from inferior's memory starting at MEMADDR
210 to debugger memory starting at MYADDR. */
212 read_inferior_memory (CORE_ADDR memaddr
, char *myaddr
, int len
)
215 /* Round starting address down to longword boundary. */
216 register CORE_ADDR addr
= memaddr
& -sizeof (int);
217 /* Round ending address up; get number of longwords that makes. */
219 = (((memaddr
+ len
) - addr
) + sizeof (int) - 1) / sizeof (int);
220 /* Allocate buffer of that many longwords. */
221 register int *buffer
= (int *) alloca (count
* sizeof (int));
223 /* Read all the longwords */
224 for (i
= 0; i
< count
; i
++, addr
+= sizeof (int))
226 buffer
[i
] = ptrace (1, inferior_pid
, addr
, 0);
229 /* Copy appropriate bytes out of the buffer. */
230 memcpy (myaddr
, (char *) buffer
+ (memaddr
& (sizeof (int) - 1)), len
);
233 /* Copy LEN bytes of data from debugger memory at MYADDR
234 to inferior's memory at MEMADDR.
235 On failure (cannot write the inferior)
236 returns the value of errno. */
239 write_inferior_memory (CORE_ADDR memaddr
, char *myaddr
, int len
)
242 /* Round starting address down to longword boundary. */
243 register CORE_ADDR addr
= memaddr
& -sizeof (int);
244 /* Round ending address up; get number of longwords that makes. */
246 = (((memaddr
+ len
) - addr
) + sizeof (int) - 1) / sizeof (int);
247 /* Allocate buffer of that many longwords. */
248 register int *buffer
= (int *) alloca (count
* sizeof (int));
251 /* Fill start and end extra bytes of buffer with existing memory data. */
253 buffer
[0] = ptrace (1, inferior_pid
, addr
, 0);
258 = ptrace (1, inferior_pid
,
259 addr
+ (count
- 1) * sizeof (int), 0);
262 /* Copy data to be written over corresponding part of buffer */
264 memcpy ((char *) buffer
+ (memaddr
& (sizeof (int) - 1)), myaddr
, len
);
266 /* Write the entire buffer. */
268 for (i
= 0; i
< count
; i
++, addr
+= sizeof (int))
271 ptrace (4, inferior_pid
, addr
, buffer
[i
]);
280 initialize_low (void)