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*********************/
37 char registers
[REGISTER_BYTES
];
39 /* Index within `registers' of the first byte of the space for
43 char buf2
[MAX_REGISTER_RAW_SIZE
];
44 /***************End MY defs*********************/
46 #include <sys/ptrace.h>
47 #include <machine/reg.h>
50 extern char **sys_errlist
;
51 extern char **environ
;
53 extern int inferior_pid
;
54 void 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 /* Return nonzero if the given thread is still alive. */
107 /* Wait for process, returns status */
117 if (pid
!= inferior_pid
)
118 perror_with_name ("wait");
122 fprintf (stderr
, "\nChild exited with retcode = %x \n", WEXITSTATUS (w
));
124 return ((unsigned char) WEXITSTATUS (w
));
126 else if (!WIFSTOPPED (w
))
128 fprintf (stderr
, "\nChild terminated with signal = %x \n", WTERMSIG (w
));
130 return ((unsigned char) WTERMSIG (w
));
133 fetch_inferior_registers (0);
136 return ((unsigned char) WSTOPSIG (w
));
139 /* Resume execution of the inferior process.
140 If STEP is nonzero, single-step it.
141 If SIGNAL is nonzero, give it that signal. */
144 myresume (step
, signal
)
149 ptrace (step
? PTRACE_SINGLESTEP
: PTRACE_CONT
, inferior_pid
, 1, signal
);
151 perror_with_name ("ptrace");
154 /* Fetch one or more registers from the inferior. REGNO == -1 to get
155 them all. We actually fetch more than requested, when convenient,
156 marking them as valid so we won't fetch them again. */
159 fetch_inferior_registers (ignored
)
162 struct regs inferior_registers
;
163 struct fp_status inferior_fp_registers
;
165 ptrace (PTRACE_GETREGS
, inferior_pid
,
166 (PTRACE_ARG3_TYPE
) & inferior_registers
);
168 ptrace (PTRACE_GETFPREGS
, inferior_pid
,
169 (PTRACE_ARG3_TYPE
) & inferior_fp_registers
);
172 memcpy (registers
, &inferior_registers
, 16 * 4);
174 memcpy (®isters
[REGISTER_BYTE (FP0_REGNUM
)], &inferior_fp_registers
,
175 sizeof inferior_fp_registers
.fps_regs
);
177 *(int *) ®isters
[REGISTER_BYTE (PS_REGNUM
)] = inferior_registers
.r_ps
;
178 *(int *) ®isters
[REGISTER_BYTE (PC_REGNUM
)] = inferior_registers
.r_pc
;
181 (®isters
[REGISTER_BYTE (FPC_REGNUM
)],
182 &inferior_fp_registers
.fps_control
,
183 sizeof inferior_fp_registers
- sizeof inferior_fp_registers
.fps_regs
);
187 /* Store our register values back into the inferior.
188 If REGNO is -1, do this for all registers.
189 Otherwise, REGNO specifies which register (so we can save time). */
192 store_inferior_registers (ignored
)
195 struct regs inferior_registers
;
196 struct fp_status inferior_fp_registers
;
198 memcpy (&inferior_registers
, registers
, 16 * 4);
200 memcpy (&inferior_fp_registers
,
201 ®isters
[REGISTER_BYTE (FP0_REGNUM
)],
202 sizeof inferior_fp_registers
.fps_regs
);
204 inferior_registers
.r_ps
= *(int *) ®isters
[REGISTER_BYTE (PS_REGNUM
)];
205 inferior_registers
.r_pc
= *(int *) ®isters
[REGISTER_BYTE (PC_REGNUM
)];
208 memcpy (&inferior_fp_registers
.fps_control
,
209 ®isters
[REGISTER_BYTE (FPC_REGNUM
)],
210 (sizeof inferior_fp_registers
211 - sizeof inferior_fp_registers
.fps_regs
));
214 ptrace (PTRACE_SETREGS
, inferior_pid
,
215 (PTRACE_ARG3_TYPE
) & inferior_registers
);
217 ptrace (PTRACE_SETFPREGS
, inferior_pid
,
218 (PTRACE_ARG3_TYPE
) & inferior_fp_registers
);
222 /* NOTE! I tried using PTRACE_READDATA, etc., to read and write memory
223 in the NEW_SUN_PTRACE case.
224 It ought to be straightforward. But it appears that writing did
225 not write the data that I specified. I cannot understand where
226 it got the data that it actually did write. */
228 /* Copy LEN bytes from inferior's memory starting at MEMADDR
229 to debugger memory starting at MYADDR. */
231 read_inferior_memory (memaddr
, myaddr
, len
)
237 /* Round starting address down to longword boundary. */
238 register CORE_ADDR addr
= memaddr
& -sizeof (int);
239 /* Round ending address up; get number of longwords that makes. */
241 = (((memaddr
+ len
) - addr
) + sizeof (int) - 1) / sizeof (int);
242 /* Allocate buffer of that many longwords. */
243 register int *buffer
= (int *) alloca (count
* sizeof (int));
245 /* Read all the longwords */
246 for (i
= 0; i
< count
; i
++, addr
+= sizeof (int))
248 buffer
[i
] = ptrace (1, inferior_pid
, addr
, 0);
251 /* Copy appropriate bytes out of the buffer. */
252 memcpy (myaddr
, (char *) buffer
+ (memaddr
& (sizeof (int) - 1)), len
);
255 /* Copy LEN bytes of data from debugger memory at MYADDR
256 to inferior's memory at MEMADDR.
257 On failure (cannot write the inferior)
258 returns the value of errno. */
261 write_inferior_memory (memaddr
, myaddr
, len
)
267 /* Round starting address down to longword boundary. */
268 register CORE_ADDR addr
= memaddr
& -sizeof (int);
269 /* Round ending address up; get number of longwords that makes. */
271 = (((memaddr
+ len
) - addr
) + sizeof (int) - 1) / sizeof (int);
272 /* Allocate buffer of that many longwords. */
273 register int *buffer
= (int *) alloca (count
* sizeof (int));
276 /* Fill start and end extra bytes of buffer with existing memory data. */
278 buffer
[0] = ptrace (1, inferior_pid
, addr
, 0);
283 = ptrace (1, inferior_pid
,
284 addr
+ (count
- 1) * sizeof (int), 0);
287 /* Copy data to be written over corresponding part of buffer */
289 memcpy ((char *) buffer
+ (memaddr
& (sizeof (int) - 1)), myaddr
, len
);
291 /* Write the entire buffer. */
293 for (i
= 0; i
< count
; i
++, addr
+= sizeof (int))
296 ptrace (4, inferior_pid
, addr
, buffer
[i
]);
313 return inferior_pid
!= 0;