1 /* Low level interface to ptrace, for the remote server for GDB.
2 Copyright 1995, 1996, 1999, 2000, 2001 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 /* Return nonzero if the given thread is still alive. */
86 mythread_alive (int pid
)
91 /* Wait for process, returns status */
100 pid
= waitpid (inferior_pid
, &w
, 0);
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
? PT_STEP
: PT_CONTINUE
, inferior_pid
, 1, signal
, 0);
134 perror_with_name ("ptrace");
138 #if !defined (offsetof)
139 #define offsetof(TYPE, MEMBER) ((unsigned long) &((TYPE *)0)->MEMBER)
142 /* U_REGS_OFFSET is the offset of the registers within the u area. */
143 #if !defined (U_REGS_OFFSET)
144 #define U_REGS_OFFSET \
145 ptrace (PT_READ_U, inferior_pid, \
146 (PTRACE_ARG3_TYPE) (offsetof (struct user, u_ar0)), 0) \
151 register_addr (int regno
, CORE_ADDR blockend
)
155 if (regno
< 0 || regno
>= NUM_REGS
)
156 error ("Invalid register number %d.", regno
);
158 REGISTER_U_ADDR (addr
, blockend
, regno
);
163 /* Fetch one register. */
166 fetch_register (int regno
)
168 register unsigned int regaddr
;
169 char buf
[MAX_REGISTER_RAW_SIZE
];
172 /* Offset of registers within the u area. */
175 offset
= U_REGS_OFFSET
;
177 regaddr
= register_addr (regno
, offset
);
178 for (i
= 0; i
< REGISTER_RAW_SIZE (regno
); i
+= sizeof (int))
181 *(int *) ®isters
[regno
* 4 + i
] = ptrace (PT_RUREGS
, inferior_pid
,
182 (PTRACE_ARG3_TYPE
) regaddr
, 0, 0);
183 regaddr
+= sizeof (int);
186 /* Warning, not error, in case we are attached; sometimes the
187 kernel doesn't let us at the registers. */
188 char *err
= strerror (errno
);
189 char *msg
= alloca (strlen (err
) + 128);
190 sprintf (msg
, "reading register %d: %s", regno
, err
);
198 /* Fetch all registers, or just one, from the child process. */
201 fetch_inferior_registers (int regno
)
203 if (regno
== -1 || regno
== 0)
204 for (regno
= 0; regno
< NUM_REGS
; regno
++)
205 fetch_register (regno
);
207 fetch_register (regno
);
210 /* Store our register values back into the inferior.
211 If REGNO is -1, do this for all registers.
212 Otherwise, REGNO specifies which register (so we can save time). */
215 store_inferior_registers (int regno
)
217 register unsigned int regaddr
;
219 extern char registers
[];
221 unsigned int offset
= U_REGS_OFFSET
;
226 if (CANNOT_STORE_REGISTER (regno
))
228 regaddr
= register_addr (regno
, offset
);
230 if (regno
== PCOQ_HEAD_REGNUM
|| regno
== PCOQ_TAIL_REGNUM
)
232 scratch
= *(int *) ®isters
[REGISTER_BYTE (regno
)] | 0x3;
233 ptrace (PT_WUREGS
, inferior_pid
, (PTRACE_ARG3_TYPE
) regaddr
,
237 /* Error, even if attached. Failing to write these two
238 registers is pretty serious. */
239 sprintf (buf
, "writing register number %d", regno
);
240 perror_with_name (buf
);
244 for (i
= 0; i
< REGISTER_RAW_SIZE (regno
); i
+= sizeof (int))
247 ptrace (PT_WUREGS
, inferior_pid
, (PTRACE_ARG3_TYPE
) regaddr
,
248 *(int *) ®isters
[REGISTER_BYTE (regno
) + i
], 0);
251 /* Warning, not error, in case we are attached; sometimes the
252 kernel doesn't let us at the registers. */
253 char *err
= strerror (errno
);
254 char *msg
= alloca (strlen (err
) + 128);
255 sprintf (msg
, "writing register %d: %s",
260 regaddr
+= sizeof (int);
264 for (regno
= 0; regno
< NUM_REGS
; regno
++)
265 store_inferior_registers (regno
);
268 /* NOTE! I tried using PTRACE_READDATA, etc., to read and write memory
269 in the NEW_SUN_PTRACE case.
270 It ought to be straightforward. But it appears that writing did
271 not write the data that I specified. I cannot understand where
272 it got the data that it actually did write. */
274 /* Copy LEN bytes from inferior's memory starting at MEMADDR
275 to debugger memory starting at MYADDR. */
278 read_inferior_memory (CORE_ADDR memaddr
, char *myaddr
, int len
)
281 /* Round starting address down to longword boundary. */
282 register CORE_ADDR addr
= memaddr
& -(CORE_ADDR
) sizeof (int);
283 /* Round ending address up; get number of longwords that makes. */
285 = (((memaddr
+ len
) - addr
) + sizeof (int) - 1) / sizeof (int);
286 /* Allocate buffer of that many longwords. */
287 register int *buffer
= (int *) alloca (count
* sizeof (int));
289 /* Read all the longwords */
290 for (i
= 0; i
< count
; i
++, addr
+= sizeof (int))
292 buffer
[i
] = ptrace (1, inferior_pid
, addr
, 0, 0);
295 /* Copy appropriate bytes out of the buffer. */
296 memcpy (myaddr
, (char *) buffer
+ (memaddr
& (sizeof (int) - 1)), len
);
299 /* Copy LEN bytes of data from debugger memory at MYADDR
300 to inferior's memory at MEMADDR.
301 On failure (cannot write the inferior)
302 returns the value of errno. */
305 write_inferior_memory (CORE_ADDR memaddr
, char *myaddr
, int len
)
308 /* Round starting address down to longword boundary. */
309 register CORE_ADDR addr
= memaddr
& -(CORE_ADDR
) sizeof (int);
310 /* Round ending address up; get number of longwords that makes. */
312 = (((memaddr
+ len
) - addr
) + sizeof (int) - 1) / sizeof (int);
313 /* Allocate buffer of that many longwords. */
314 register int *buffer
= (int *) alloca (count
* sizeof (int));
317 /* Fill start and end extra bytes of buffer with existing memory data. */
319 buffer
[0] = ptrace (1, inferior_pid
, addr
, 0, 0);
324 = ptrace (1, inferior_pid
,
325 addr
+ (count
- 1) * sizeof (int), 0, 0);
328 /* Copy data to be written over corresponding part of buffer */
330 memcpy ((char *) buffer
+ (memaddr
& (sizeof (int) - 1)), myaddr
, len
);
332 /* Write the entire buffer. */
334 for (i
= 0; i
< count
; i
++, addr
+= sizeof (int))
337 ptrace (4, inferior_pid
, addr
, buffer
[i
], 0);
346 initialize_low (void)
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