1 /* Low level interface to ptrace, for the remote server for GDB.
2 Copyright 1995, 1996, 1999, 2000, 2001, 2002 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. */
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>
45 /* Start an inferior process and returns its pid.
46 ALLARGS is a vector of program-name and args. */
49 create_inferior (char *program
, char **allargs
)
55 perror_with_name ("fork");
59 ptrace (PT_TRACE_ME
, 0, 0, 0, 0);
61 execv (program
, allargs
);
63 fprintf (stderr
, "Cannot exec %s: %s.\n", program
,
64 errno
< sys_nerr
? sys_errlist
[errno
] : "unknown error");
72 /* Kill the inferior process. Make us have no inferior. */
77 if (inferior_pid
== 0)
79 ptrace (8, inferior_pid
, 0, 0, 0);
81 /*************inferior_died ();****VK**************/
84 /* Attaching is not supported. */
91 /* Return nonzero if the given thread is still alive. */
93 mythread_alive (int pid
)
98 /* Wait for process, returns status */
101 mywait (char *status
)
107 pid
= waitpid (inferior_pid
, &w
, 0);
109 if (pid
!= inferior_pid
)
110 perror_with_name ("wait");
114 fprintf (stderr
, "\nChild exited with retcode = %x \n", WEXITSTATUS (w
));
116 return ((unsigned char) WEXITSTATUS (w
));
118 else if (!WIFSTOPPED (w
))
120 fprintf (stderr
, "\nChild terminated with signal = %x \n", WTERMSIG (w
));
122 return ((unsigned char) WTERMSIG (w
));
125 fetch_inferior_registers (0);
128 return ((unsigned char) WSTOPSIG (w
));
131 /* Resume execution of the inferior process.
132 If STEP is nonzero, single-step it.
133 If SIGNAL is nonzero, give it that signal. */
136 myresume (int step
, int signal
)
139 ptrace (step
? PT_STEP
: PT_CONTINUE
, inferior_pid
, 1, signal
, 0);
141 perror_with_name ("ptrace");
145 #if !defined (offsetof)
146 #define offsetof(TYPE, MEMBER) ((unsigned long) &((TYPE *)0)->MEMBER)
149 /* U_REGS_OFFSET is the offset of the registers within the u area. */
150 #if !defined (U_REGS_OFFSET)
151 #define U_REGS_OFFSET \
152 ptrace (PT_READ_U, inferior_pid, \
153 (PTRACE_ARG3_TYPE) (offsetof (struct user, u_ar0)), 0) \
158 register_addr (int regno
, CORE_ADDR blockend
)
162 if (regno
< 0 || regno
>= NUM_REGS
)
163 error ("Invalid register number %d.", regno
);
165 REGISTER_U_ADDR (addr
, blockend
, regno
);
170 /* Fetch one register. */
173 fetch_register (int regno
)
175 register unsigned int regaddr
;
176 char buf
[MAX_REGISTER_RAW_SIZE
];
179 /* Offset of registers within the u area. */
182 offset
= U_REGS_OFFSET
;
184 regaddr
= register_addr (regno
, offset
);
185 for (i
= 0; i
< REGISTER_RAW_SIZE (regno
); i
+= sizeof (int))
188 *(int *) ®isters
[regno
* 4 + i
] = ptrace (PT_RUREGS
, inferior_pid
,
189 (PTRACE_ARG3_TYPE
) regaddr
, 0, 0);
190 regaddr
+= sizeof (int);
193 /* Warning, not error, in case we are attached; sometimes the
194 kernel doesn't let us at the registers. */
195 char *err
= strerror (errno
);
196 char *msg
= alloca (strlen (err
) + 128);
197 sprintf (msg
, "reading register %d: %s", regno
, err
);
205 /* Fetch all registers, or just one, from the child process. */
208 fetch_inferior_registers (int regno
)
210 if (regno
== -1 || regno
== 0)
211 for (regno
= 0; regno
< NUM_REGS
; regno
++)
212 fetch_register (regno
);
214 fetch_register (regno
);
217 /* Store our register values back into the inferior.
218 If REGNO is -1, do this for all registers.
219 Otherwise, REGNO specifies which register (so we can save time). */
222 store_inferior_registers (int regno
)
224 register unsigned int regaddr
;
226 extern char registers
[];
228 unsigned int offset
= U_REGS_OFFSET
;
233 if (CANNOT_STORE_REGISTER (regno
))
235 regaddr
= register_addr (regno
, offset
);
237 if (regno
== PCOQ_HEAD_REGNUM
|| regno
== PCOQ_TAIL_REGNUM
)
239 scratch
= *(int *) ®isters
[REGISTER_BYTE (regno
)] | 0x3;
240 ptrace (PT_WUREGS
, inferior_pid
, (PTRACE_ARG3_TYPE
) regaddr
,
244 /* Error, even if attached. Failing to write these two
245 registers is pretty serious. */
246 sprintf (buf
, "writing register number %d", regno
);
247 perror_with_name (buf
);
251 for (i
= 0; i
< REGISTER_RAW_SIZE (regno
); i
+= sizeof (int))
254 ptrace (PT_WUREGS
, inferior_pid
, (PTRACE_ARG3_TYPE
) regaddr
,
255 *(int *) ®isters
[REGISTER_BYTE (regno
) + i
], 0);
258 /* Warning, not error, in case we are attached; sometimes the
259 kernel doesn't let us at the registers. */
260 char *err
= strerror (errno
);
261 char *msg
= alloca (strlen (err
) + 128);
262 sprintf (msg
, "writing register %d: %s",
267 regaddr
+= sizeof (int);
271 for (regno
= 0; regno
< NUM_REGS
; regno
++)
272 store_inferior_registers (regno
);
275 /* NOTE! I tried using PTRACE_READDATA, etc., to read and write memory
276 in the NEW_SUN_PTRACE case.
277 It ought to be straightforward. But it appears that writing did
278 not write the data that I specified. I cannot understand where
279 it got the data that it actually did write. */
281 /* Copy LEN bytes from inferior's memory starting at MEMADDR
282 to debugger memory starting at MYADDR. */
285 read_inferior_memory (CORE_ADDR memaddr
, char *myaddr
, int len
)
288 /* Round starting address down to longword boundary. */
289 register CORE_ADDR addr
= memaddr
& -(CORE_ADDR
) sizeof (int);
290 /* Round ending address up; get number of longwords that makes. */
292 = (((memaddr
+ len
) - addr
) + sizeof (int) - 1) / sizeof (int);
293 /* Allocate buffer of that many longwords. */
294 register int *buffer
= (int *) alloca (count
* sizeof (int));
296 /* Read all the longwords */
297 for (i
= 0; i
< count
; i
++, addr
+= sizeof (int))
299 buffer
[i
] = ptrace (1, inferior_pid
, addr
, 0, 0);
302 /* Copy appropriate bytes out of the buffer. */
303 memcpy (myaddr
, (char *) buffer
+ (memaddr
& (sizeof (int) - 1)), len
);
306 /* Copy LEN bytes of data from debugger memory at MYADDR
307 to inferior's memory at MEMADDR.
308 On failure (cannot write the inferior)
309 returns the value of errno. */
312 write_inferior_memory (CORE_ADDR memaddr
, char *myaddr
, int len
)
315 /* Round starting address down to longword boundary. */
316 register CORE_ADDR addr
= memaddr
& -(CORE_ADDR
) sizeof (int);
317 /* Round ending address up; get number of longwords that makes. */
319 = (((memaddr
+ len
) - addr
) + sizeof (int) - 1) / sizeof (int);
320 /* Allocate buffer of that many longwords. */
321 register int *buffer
= (int *) alloca (count
* sizeof (int));
324 /* Fill start and end extra bytes of buffer with existing memory data. */
326 buffer
[0] = ptrace (1, inferior_pid
, addr
, 0, 0);
331 = ptrace (1, inferior_pid
,
332 addr
+ (count
- 1) * sizeof (int), 0, 0);
335 /* Copy data to be written over corresponding part of buffer */
337 memcpy ((char *) buffer
+ (memaddr
& (sizeof (int) - 1)), myaddr
, len
);
339 /* Write the entire buffer. */
341 for (i
= 0; i
< count
; i
++, addr
+= sizeof (int))
344 ptrace (4, inferior_pid
, addr
, buffer
[i
], 0);
353 initialize_low (void)
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