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>
31 #define PT_ATTACH PTRACE_ATTACH
35 #define PT_DETACH PTRACE_DETACH
38 /* This function simply calls ptrace with the given arguments.
39 It exists so that all calls to ptrace are isolated in this
40 machine-dependent file. */
43 call_ptrace (request
, pid
, addr
, data
)
45 PTRACE_ARG3_TYPE addr
;
48 return ptrace (request
, pid
, addr
, data
, 0);
51 /* Use an extra level of indirection for ptrace calls.
52 This lets us breakpoint usefully on call_ptrace. It also
53 allows us to pass an extra argument to ptrace without
54 using an ANSI-C specific macro. */
56 #define ptrace call_ptrace
61 if (inferior_pid
== 0)
63 ptrace (PT_KILL
, inferior_pid
, (PTRACE_ARG3_TYPE
) 0, 0);
65 target_mourn_inferior ();
70 /* Start debugging the process whose number is PID. */
76 ptrace (PT_ATTACH
, pid
, (PTRACE_ARG3_TYPE
) 0, 0);
78 perror_with_name ("ptrace");
83 /* Stop debugging the process whose number is PID
84 and continue it with signal number SIGNAL.
85 SIGNAL = 0 means just continue it. */
92 ptrace (PT_DETACH
, inferior_pid
, (PTRACE_ARG3_TYPE
) 1, signal
);
94 perror_with_name ("ptrace");
97 #endif /* ATTACH_DETACH */
101 /* KERNEL_U_ADDR is the amount to subtract from u.u_ar0
102 to get the offset in the core file of the register values. */
103 #if defined (KERNEL_U_ADDR_BSD)
104 /* Get kernel_u_addr using BSD-style nlist(). */
105 CORE_ADDR kernel_u_addr
;
107 #include <a.out.gnu.h> /* For struct nlist */
110 _initialize_kernel_u_addr ()
112 struct nlist names
[2];
114 names
[0].n_un
.n_name
= "_u";
115 names
[1].n_un
.n_name
= NULL
;
116 if (nlist ("/vmunix", names
) == 0)
117 kernel_u_addr
= names
[0].n_value
;
119 fatal ("Unable to get kernel u area address.");
121 #endif /* KERNEL_U_ADDR_BSD. */
123 #if defined (KERNEL_U_ADDR_HPUX)
124 /* Get kernel_u_addr using HPUX-style nlist(). */
125 CORE_ADDR kernel_u_addr
;
130 unsigned char n_type
;
131 unsigned char n_length
;
135 static struct hpnlist nl
[] = {{ "_u", -1, }, { (char *) 0, }};
137 /* read the value of the u area from the hp-ux kernel */
138 void _initialize_kernel_u_addr ()
141 nlist ("/hp-ux", &nl
);
142 kernel_u_addr
= nl
[0].n_value
;
144 #endif /* KERNEL_U_ADDR_HPUX. */
146 #if !defined (offsetof)
147 #define offsetof(TYPE, MEMBER) ((unsigned long) &((TYPE *)0)->MEMBER)
150 /* U_REGS_OFFSET is the offset of the registers within the u area. */
151 #if !defined (U_REGS_OFFSET)
152 #define U_REGS_OFFSET \
153 ptrace (PT_READ_U, inferior_pid, \
154 (PTRACE_ARG3_TYPE) (offsetof (struct user, u_ar0)), 0) \
158 /* Fetch one register. */
161 fetch_register (regno
)
164 register unsigned int regaddr
;
165 char buf
[MAX_REGISTER_RAW_SIZE
];
168 /* Offset of registers within the u area. */
171 offset
= U_REGS_OFFSET
;
173 regaddr
= register_addr (regno
, offset
);
174 for (i
= 0; i
< REGISTER_RAW_SIZE (regno
); i
+= sizeof (int))
177 *(int *) &buf
[i
] = ptrace (PT_RUREGS
, inferior_pid
,
178 (PTRACE_ARG3_TYPE
) regaddr
, 0);
179 regaddr
+= sizeof (int);
182 /* Warning, not error, in case we are attached; sometimes the
183 kernel doesn't let us at the registers. */
184 char *err
= safe_strerror (errno
);
185 char *msg
= alloca (strlen (err
) + 128);
186 sprintf (msg
, "reading register %s: %s", reg_names
[regno
], err
);
191 supply_register (regno
, buf
);
195 /* Fetch all registers, or just one, from the child process. */
198 fetch_inferior_registers (regno
)
202 for (regno
= 0; regno
< NUM_REGS
; regno
++)
203 fetch_register (regno
);
205 fetch_register (regno
);
208 /* Store our register values back into the inferior.
209 If REGNO is -1, do this for all registers.
210 Otherwise, REGNO specifies which register (so we can save time). */
213 store_inferior_registers (regno
)
216 register unsigned int regaddr
;
217 extern char registers
[];
220 unsigned int offset
= U_REGS_OFFSET
;
224 regaddr
= register_addr (regno
, offset
);
225 for (i
= 0; i
< REGISTER_RAW_SIZE (regno
); i
+= sizeof(int))
228 ptrace (PT_WUREGS
, inferior_pid
, (PTRACE_ARG3_TYPE
) regaddr
,
229 *(int *) ®isters
[REGISTER_BYTE (regno
) + i
]);
232 char *err
= safe_strerror (errno
);
233 char *msg
= alloca (strlen (err
) + 128);
234 sprintf (msg
, "writing register %s: %s", reg_names
[regno
], err
);
237 regaddr
+= sizeof(int);
242 for (regno
= 0; regno
< NUM_REGS
; regno
++)
244 if (CANNOT_STORE_REGISTER (regno
))
246 store_inferior_registers (regno
);
252 /* Resume execution of process PID.
253 If STEP is nonzero, single-step it.
254 If SIGNAL is nonzero, give it that signal. */
257 child_resume (pid
, step
, signal
)
267 /* An address of (PTRACE_ARG3_TYPE) 1 tells ptrace to continue from where
268 it was. (If GDB wanted it to start some other way, we have already
269 written a new PC value to the child.) */
272 ptrace (PT_STEP
, pid
, (PTRACE_ARG3_TYPE
) 1, signal
);
274 ptrace (PT_CONTINUE
, pid
, (PTRACE_ARG3_TYPE
) 1, signal
);
277 perror_with_name ("ptrace");
280 /* NOTE! I tried using PTRACE_READDATA, etc., to read and write memory
281 in the NEW_SUN_PTRACE case.
282 It ought to be straightforward. But it appears that writing did
283 not write the data that I specified. I cannot understand where
284 it got the data that it actually did write. */
286 /* Copy LEN bytes to or from inferior's memory starting at MEMADDR
287 to debugger memory starting at MYADDR. Copy to inferior if
290 Returns the length copied, which is either the LEN argument or zero.
291 This xfer function does not do partial moves, since child_ops
292 doesn't allow memory operations to cross below us in the target stack
296 child_xfer_memory (memaddr
, myaddr
, len
, write
, target
)
301 struct target_ops
*target
; /* ignored */
304 /* Round starting address down to longword boundary. */
305 register CORE_ADDR addr
= memaddr
& - sizeof (int);
306 /* Round ending address up; get number of longwords that makes. */
308 = (((memaddr
+ len
) - addr
) + sizeof (int) - 1) / sizeof (int);
309 /* Allocate buffer of that many longwords. */
310 register int *buffer
= (int *) alloca (count
* sizeof (int));
314 /* Fill start and end extra bytes of buffer with existing memory data. */
316 if (addr
!= memaddr
|| len
< (int)sizeof (int)) {
317 /* Need part of initial word -- fetch it. */
318 buffer
[0] = ptrace (PT_READ_I
, inferior_pid
, (PTRACE_ARG3_TYPE
) addr
,
322 if (count
> 1) /* FIXME, avoid if even boundary */
325 = ptrace (PT_READ_I
, inferior_pid
,
326 (PTRACE_ARG3_TYPE
) (addr
+ (count
- 1) * sizeof (int)),
330 /* Copy data to be written over corresponding part of buffer */
332 memcpy ((char *) buffer
+ (memaddr
& (sizeof (int) - 1)), myaddr
, len
);
334 /* Write the entire buffer. */
336 for (i
= 0; i
< count
; i
++, addr
+= sizeof (int))
339 ptrace (PT_WRITE_D
, inferior_pid
, (PTRACE_ARG3_TYPE
) addr
,
343 /* Using the appropriate one (I or D) is necessary for
344 Gould NP1, at least. */
346 ptrace (PT_WRITE_I
, inferior_pid
, (PTRACE_ARG3_TYPE
) addr
,
355 /* Read all the longwords */
356 for (i
= 0; i
< count
; i
++, addr
+= sizeof (int))
359 buffer
[i
] = ptrace (PT_READ_I
, inferior_pid
,
360 (PTRACE_ARG3_TYPE
) addr
, 0);
366 /* Copy appropriate bytes out of the buffer. */
367 memcpy (myaddr
, (char *) buffer
+ (memaddr
& (sizeof (int) - 1)), len
);
This page took 0.036775 seconds and 4 git commands to generate.