1 /* Low level interface to ptrace, for the remote server for GDB.
2 Copyright 1986, 1987, 1993, 1994, 1995, 1997, 1999, 2000, 2001, 2002
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. */
26 /***************************
27 #include "initialize.h"
28 ****************************/
31 #include <sys/param.h>
35 #include <sys/ioctl.h>
39 /***************Begin MY defs*********************/
40 static char my_registers
[REGISTER_BYTES
];
41 char *registers
= my_registers
;
42 /***************End MY defs*********************/
44 #include <sys/ptrace.h>
48 extern char **sys_errlist
;
51 /* Start an inferior process and returns its pid.
52 ALLARGS is a vector of program-name and args. */
55 create_inferior (char *program
, char **allargs
)
61 perror_with_name ("fork");
65 ptrace (PTRACE_TRACEME
);
67 execv (program
, allargs
);
69 fprintf (stderr
, "Cannot exec %s: %s.\n", program
,
70 errno
< sys_nerr
? sys_errlist
[errno
] : "unknown error");
78 /* Attaching is not supported. */
85 /* Kill the inferior process. Make us have no inferior. */
90 if (inferior_pid
== 0)
92 ptrace (8, inferior_pid
, 0, 0);
94 /*************inferior_died ();****VK**************/
97 /* Return nonzero if the given thread is still alive. */
99 mythread_alive (int pid
)
104 /* Wait for process, returns status */
107 mywait (char *status
)
113 pid
= waitpid (inferior_pid
, &w
, 0);
115 if (pid
!= inferior_pid
)
116 perror_with_name ("wait");
120 fprintf (stderr
, "\nChild exited with retcode = %x \n", WEXITSTATUS (w
));
122 return ((unsigned char) WEXITSTATUS (w
));
124 else if (!WIFSTOPPED (w
))
126 fprintf (stderr
, "\nChild terminated with signal = %x \n", WTERMSIG (w
));
128 return ((unsigned char) WTERMSIG (w
));
131 fetch_inferior_registers (0);
134 return ((unsigned char) WSTOPSIG (w
));
137 /* Resume execution of the inferior process.
138 If STEP is nonzero, single-step it.
139 If SIGNAL is nonzero, give it that signal. */
142 myresume (int step
, int signal
)
145 ptrace (step
? PTRACE_SINGLESTEP
: PTRACE_CONT
, inferior_pid
, 1, signal
);
147 perror_with_name ("ptrace");
150 /* Fetch one or more registers from the inferior. REGNO == -1 to get
151 them all. We actually fetch more than requested, when convenient,
152 marking them as valid so we won't fetch them again. */
155 fetch_inferior_registers (int ignored
)
157 struct regs inferior_registers
;
158 struct fp_status inferior_fp_registers
;
161 /* Global and Out regs are fetched directly, as well as the control
162 registers. If we're getting one of the in or local regs,
163 and the stack pointer has not yet been fetched,
164 we have to do that first, since they're found in memory relative
165 to the stack pointer. */
167 if (ptrace (PTRACE_GETREGS
, inferior_pid
,
168 (PTRACE_ARG3_TYPE
) & inferior_registers
, 0))
169 perror ("ptrace_getregs");
171 registers
[REGISTER_BYTE (0)] = 0;
172 memcpy (®isters
[REGISTER_BYTE (1)], &inferior_registers
.r_g1
,
173 15 * REGISTER_RAW_SIZE (G0_REGNUM
));
174 *(int *) ®isters
[REGISTER_BYTE (PS_REGNUM
)] = inferior_registers
.r_ps
;
175 *(int *) ®isters
[REGISTER_BYTE (PC_REGNUM
)] = inferior_registers
.r_pc
;
176 *(int *) ®isters
[REGISTER_BYTE (NPC_REGNUM
)] = inferior_registers
.r_npc
;
177 *(int *) ®isters
[REGISTER_BYTE (Y_REGNUM
)] = inferior_registers
.r_y
;
179 /* Floating point registers */
181 if (ptrace (PTRACE_GETFPREGS
, inferior_pid
,
182 (PTRACE_ARG3_TYPE
) & inferior_fp_registers
,
184 perror ("ptrace_getfpregs");
185 memcpy (®isters
[REGISTER_BYTE (FP0_REGNUM
)], &inferior_fp_registers
,
186 sizeof inferior_fp_registers
.fpu_fr
);
188 /* These regs are saved on the stack by the kernel. Only read them
189 all (16 ptrace calls!) if we really need them. */
191 read_inferior_memory (*(CORE_ADDR
*) & registers
[REGISTER_BYTE (SP_REGNUM
)],
192 ®isters
[REGISTER_BYTE (L0_REGNUM
)],
193 16 * REGISTER_RAW_SIZE (L0_REGNUM
));
196 /* Store our register values back into the inferior.
197 If REGNO is -1, do this for all registers.
198 Otherwise, REGNO specifies which register (so we can save time). */
201 store_inferior_registers (int ignored
)
203 struct regs inferior_registers
;
204 struct fp_status inferior_fp_registers
;
205 CORE_ADDR sp
= *(CORE_ADDR
*) & registers
[REGISTER_BYTE (SP_REGNUM
)];
207 write_inferior_memory (sp
, ®isters
[REGISTER_BYTE (L0_REGNUM
)],
208 16 * REGISTER_RAW_SIZE (L0_REGNUM
));
210 memcpy (&inferior_registers
.r_g1
, ®isters
[REGISTER_BYTE (G1_REGNUM
)],
211 15 * REGISTER_RAW_SIZE (G1_REGNUM
));
213 inferior_registers
.r_ps
=
214 *(int *) ®isters
[REGISTER_BYTE (PS_REGNUM
)];
215 inferior_registers
.r_pc
=
216 *(int *) ®isters
[REGISTER_BYTE (PC_REGNUM
)];
217 inferior_registers
.r_npc
=
218 *(int *) ®isters
[REGISTER_BYTE (NPC_REGNUM
)];
219 inferior_registers
.r_y
=
220 *(int *) ®isters
[REGISTER_BYTE (Y_REGNUM
)];
222 if (ptrace (PTRACE_SETREGS
, inferior_pid
,
223 (PTRACE_ARG3_TYPE
) & inferior_registers
, 0))
224 perror ("ptrace_setregs");
226 memcpy (&inferior_fp_registers
, ®isters
[REGISTER_BYTE (FP0_REGNUM
)],
227 sizeof inferior_fp_registers
.fpu_fr
);
229 if (ptrace (PTRACE_SETFPREGS
, inferior_pid
,
230 (PTRACE_ARG3_TYPE
) & inferior_fp_registers
, 0))
231 perror ("ptrace_setfpregs");
234 /* NOTE! I tried using PTRACE_READDATA, etc., to read and write memory
235 in the NEW_SUN_PTRACE case.
236 It ought to be straightforward. But it appears that writing did
237 not write the data that I specified. I cannot understand where
238 it got the data that it actually did write. */
240 /* Copy LEN bytes from inferior's memory starting at MEMADDR
241 to debugger memory starting at MYADDR. */
244 read_inferior_memory (CORE_ADDR memaddr
, char *myaddr
, int len
)
247 /* Round starting address down to longword boundary. */
248 register CORE_ADDR addr
= memaddr
& -(CORE_ADDR
) 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 memcpy (myaddr
, (char *) buffer
+ (memaddr
& (sizeof (int) - 1)), 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 (CORE_ADDR memaddr
, char *myaddr
, int len
)
274 /* Round starting address down to longword boundary. */
275 register CORE_ADDR addr
= memaddr
& -(CORE_ADDR
) sizeof (int);
276 /* Round ending address up; get number of longwords that makes. */
278 = (((memaddr
+ len
) - addr
) + sizeof (int) - 1) / sizeof (int);
279 /* Allocate buffer of that many longwords. */
280 register int *buffer
= (int *) alloca (count
* sizeof (int));
283 /* Fill start and end extra bytes of buffer with existing memory data. */
285 buffer
[0] = ptrace (1, inferior_pid
, addr
, 0);
290 = ptrace (1, inferior_pid
,
291 addr
+ (count
- 1) * sizeof (int), 0);
294 /* Copy data to be written over corresponding part of buffer */
296 bcopy (myaddr
, (char *) buffer
+ (memaddr
& (sizeof (int) - 1)), len
);
298 /* Write the entire buffer. */
300 for (i
= 0; i
< count
; i
++, addr
+= sizeof (int))
303 ptrace (4, inferior_pid
, addr
, buffer
[i
]);
312 initialize_low (void)