1 /* Machine-dependent hooks for the unix child process stratum. This
2 code is for the HP PA-RISC cpu.
4 Copyright 1986, 1987, 1989, 1990, 1991, 1992, 1993 Free Software Foundation, Inc.
6 Contributed by the Center for Software Science at the
7 University of Utah (pa-gdb-bugs@cs.utah.edu).
9 This file is part of GDB.
11 This program is free software; you can redistribute it and/or modify
12 it under the terms of the GNU General Public License as published by
13 the Free Software Foundation; either version 2 of the License, or
14 (at your option) any later version.
16 This program is distributed in the hope that it will be useful,
17 but WITHOUT ANY WARRANTY; without even the implied warranty of
18 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 GNU General Public License for more details.
21 You should have received a copy of the GNU General Public License
22 along with this program; if not, write to the Free Software
23 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
28 #include <sys/ptrace.h>
30 #ifdef FIVE_ARG_PTRACE
32 /* Deal with HPUX 8.0 braindamage. */
33 #define ptrace(a,b,c,d) ptrace(a,b,c,d,0)
38 #define PT_ATTACH PTRACE_ATTACH
42 #define PT_DETACH PTRACE_DETACH
45 /* This function simply calls ptrace with the given arguments.
46 It exists so that all calls to ptrace are isolated in this
47 machine-dependent file. */
50 call_ptrace (request
, pid
, addr
, data
)
52 PTRACE_ARG3_TYPE addr
;
55 return ptrace (request
, pid
, addr
, data
);
59 /* For the rest of the file, use an extra level of indirection */
60 /* This lets us breakpoint usefully on call_ptrace. */
61 #define ptrace call_ptrace
67 if (inferior_pid
== 0)
69 ptrace (PT_KILL
, inferior_pid
, (PTRACE_ARG3_TYPE
) 0, 0);
71 target_mourn_inferior ();
76 /* Start debugging the process whose number is PID. */
82 ptrace (PT_ATTACH
, pid
, (PTRACE_ARG3_TYPE
) 0, 0);
84 perror_with_name ("ptrace");
89 /* Stop debugging the process whose number is PID
90 and continue it with signal number SIGNAL.
91 SIGNAL = 0 means just continue it. */
98 ptrace (PT_DETACH
, inferior_pid
, (PTRACE_ARG3_TYPE
) 1, signal
);
100 perror_with_name ("ptrace");
103 #endif /* ATTACH_DETACH */
107 #if !defined (FETCH_INFERIOR_REGISTERS)
109 /* KERNEL_U_ADDR is the amount to subtract from u.u_ar0
110 to get the offset in the core file of the register values. */
111 #if defined (KERNEL_U_ADDR_BSD)
112 /* Get kernel_u_addr using BSD-style nlist(). */
113 CORE_ADDR kernel_u_addr
;
115 #include <a.out.gnu.h> /* For struct nlist */
118 _initialize_kernel_u_addr ()
120 struct nlist names
[2];
122 names
[0].n_un
.n_name
= "_u";
123 names
[1].n_un
.n_name
= NULL
;
124 if (nlist ("/vmunix", names
) == 0)
125 kernel_u_addr
= names
[0].n_value
;
127 fatal ("Unable to get kernel u area address.");
129 #endif /* KERNEL_U_ADDR_BSD. */
131 #if defined (KERNEL_U_ADDR_HPUX)
132 /* Get kernel_u_addr using HPUX-style nlist(). */
133 CORE_ADDR kernel_u_addr
;
138 unsigned char n_type
;
139 unsigned char n_length
;
143 static struct hpnlist nl
[] = {{ "_u", -1, }, { (char *) 0, }};
145 /* read the value of the u area from the hp-ux kernel */
146 void _initialize_kernel_u_addr ()
149 nlist ("/hp-ux", &nl
);
150 kernel_u_addr
= nl
[0].n_value
;
152 #endif /* KERNEL_U_ADDR_HPUX. */
154 #if !defined (offsetof)
155 #define offsetof(TYPE, MEMBER) ((unsigned long) &((TYPE *)0)->MEMBER)
158 /* U_REGS_OFFSET is the offset of the registers within the u area. */
159 #if !defined (U_REGS_OFFSET)
160 #define U_REGS_OFFSET \
161 ptrace (PT_READ_U, inferior_pid, \
162 (PTRACE_ARG3_TYPE) (offsetof (struct user, u_ar0)), 0) \
166 /* Registers we shouldn't try to fetch. */
167 #if !defined (CANNOT_FETCH_REGISTER)
168 #define CANNOT_FETCH_REGISTER(regno) 0
171 /* Fetch one register. */
174 fetch_register (regno
)
177 register unsigned int regaddr
;
178 char buf
[MAX_REGISTER_RAW_SIZE
];
179 char mess
[128]; /* For messages */
182 /* Offset of registers within the u area. */
185 if (CANNOT_FETCH_REGISTER (regno
))
187 bzero (buf
, REGISTER_RAW_SIZE (regno
)); /* Supply zeroes */
188 supply_register (regno
, buf
);
192 offset
= U_REGS_OFFSET
;
194 regaddr
= register_addr (regno
, offset
);
195 for (i
= 0; i
< REGISTER_RAW_SIZE (regno
); i
+= sizeof (int))
198 *(int *) &buf
[i
] = ptrace (PT_RUREGS
, inferior_pid
,
199 (PTRACE_ARG3_TYPE
) regaddr
, 0);
200 regaddr
+= sizeof (int);
203 sprintf (mess
, "reading register %s (#%d)", reg_names
[regno
], regno
);
204 perror_with_name (mess
);
207 supply_register (regno
, buf
);
210 #endif /* !defined (FETCH_INFERIOR_REGISTERS). */
211 /* Fetch all registers, or just one, from the child process. */
213 #ifndef FETCH_INFERIOR_REGISTERS
215 fetch_inferior_registers (regno
)
219 for (regno
= 0; regno
< NUM_REGS
; regno
++)
220 fetch_register (regno
);
222 fetch_register (regno
);
225 /* Registers we shouldn't try to store. */
226 #if !defined (CANNOT_STORE_REGISTER)
227 #define CANNOT_STORE_REGISTER(regno) 0
230 /* Store our register values back into the inferior.
231 If REGNO is -1, do this for all registers.
232 Otherwise, REGNO specifies which register (so we can save time). */
235 store_inferior_registers (regno
)
238 register unsigned int regaddr
;
240 extern char registers
[];
243 unsigned int offset
= U_REGS_OFFSET
;
247 regaddr
= register_addr (regno
, offset
);
248 for (i
= 0; i
< REGISTER_RAW_SIZE (regno
); i
+= sizeof(int))
251 ptrace (PT_WUREGS
, inferior_pid
, (PTRACE_ARG3_TYPE
) regaddr
,
252 *(int *) ®isters
[REGISTER_BYTE (regno
) + i
]);
255 sprintf (buf
, "writing register number %d(%d)", regno
, i
);
256 perror_with_name (buf
);
258 regaddr
+= sizeof(int);
263 for (regno
= 0; regno
< NUM_REGS
; regno
++)
265 if (CANNOT_STORE_REGISTER (regno
))
267 regaddr
= register_addr (regno
, offset
);
268 for (i
= 0; i
< REGISTER_RAW_SIZE (regno
); i
+= sizeof(int))
271 ptrace (PT_WUREGS
, inferior_pid
, (PTRACE_ARG3_TYPE
) regaddr
,
272 *(int *) ®isters
[REGISTER_BYTE (regno
) + i
]);
275 sprintf (buf
, "writing register number %d(%d)", regno
, i
);
276 perror_with_name (buf
);
278 regaddr
+= sizeof(int);
284 #endif /* !defined(FETCH_INFERIOR_REGISTERS) */
286 /* Resume execution of the inferior process.
287 If STEP is nonzero, single-step it.
288 If SIGNAL is nonzero, give it that signal. */
291 child_resume (step
, signal
)
297 /* An address of (PTRACE_ARG3_TYPE) 1 tells ptrace to continue from where
298 it was. (If GDB wanted it to start some other way, we have already
299 written a new PC value to the child.) */
302 ptrace (PT_STEP
, inferior_pid
, (PTRACE_ARG3_TYPE
) 1, signal
);
304 ptrace (PT_CONTINUE
, inferior_pid
, (PTRACE_ARG3_TYPE
) 1, signal
);
307 perror_with_name ("ptrace");
310 /* NOTE! I tried using PTRACE_READDATA, etc., to read and write memory
311 in the NEW_SUN_PTRACE case.
312 It ought to be straightforward. But it appears that writing did
313 not write the data that I specified. I cannot understand where
314 it got the data that it actually did write. */
316 /* Copy LEN bytes to or from inferior's memory starting at MEMADDR
317 to debugger memory starting at MYADDR. Copy to inferior if
320 Returns the length copied, which is either the LEN argument or zero.
321 This xfer function does not do partial moves, since child_ops
322 doesn't allow memory operations to cross below us in the target stack
326 child_xfer_memory (memaddr
, myaddr
, len
, write
, target
)
331 struct target_ops
*target
; /* ignored */
334 /* Round starting address down to longword boundary. */
335 register CORE_ADDR addr
= memaddr
& - sizeof (int);
336 /* Round ending address up; get number of longwords that makes. */
338 = (((memaddr
+ len
) - addr
) + sizeof (int) - 1) / sizeof (int);
339 /* Allocate buffer of that many longwords. */
340 register int *buffer
= (int *) alloca (count
* sizeof (int));
344 /* Fill start and end extra bytes of buffer with existing memory data. */
346 if (addr
!= memaddr
|| len
< (int)sizeof (int)) {
347 /* Need part of initial word -- fetch it. */
348 buffer
[0] = ptrace (PT_READ_I
, inferior_pid
, (PTRACE_ARG3_TYPE
) addr
,
352 if (count
> 1) /* FIXME, avoid if even boundary */
355 = ptrace (PT_READ_I
, inferior_pid
,
356 (PTRACE_ARG3_TYPE
) (addr
+ (count
- 1) * sizeof (int)),
360 /* Copy data to be written over corresponding part of buffer */
362 bcopy (myaddr
, (char *) buffer
+ (memaddr
& (sizeof (int) - 1)), len
);
364 /* Write the entire buffer. */
366 for (i
= 0; i
< count
; i
++, addr
+= sizeof (int))
369 ptrace (PT_WRITE_D
, inferior_pid
, (PTRACE_ARG3_TYPE
) addr
,
373 /* Using the appropriate one (I or D) is necessary for
374 Gould NP1, at least. */
376 ptrace (PT_WRITE_I
, inferior_pid
, (PTRACE_ARG3_TYPE
) addr
,
385 /* Read all the longwords */
386 for (i
= 0; i
< count
; i
++, addr
+= sizeof (int))
389 buffer
[i
] = ptrace (PT_READ_I
, inferior_pid
,
390 (PTRACE_ARG3_TYPE
) addr
, 0);
396 /* Copy appropriate bytes out of the buffer. */
397 bcopy ((char *) buffer
+ (memaddr
& (sizeof (int) - 1)), myaddr
, len
);
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