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 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. */
29 #include <sys/ptrace.h>
31 static void fetch_register ();
33 /* This function simply calls ptrace with the given arguments.
34 It exists so that all calls to ptrace are isolated in this
35 machine-dependent file. */
37 call_ptrace (request
, pid
, addr
, data
)
39 PTRACE_ARG3_TYPE addr
;
42 return ptrace (request
, pid
, addr
, data
, 0);
48 if (inferior_pid
== 0)
50 ptrace (PT_EXIT
, inferior_pid
, (PTRACE_ARG3_TYPE
) 0, 0, 0);
52 target_mourn_inferior ();
55 /* Start debugging the process whose number is PID. */
61 ptrace (PT_ATTACH
, pid
, (PTRACE_ARG3_TYPE
) 0, 0, 0);
63 perror_with_name ("ptrace");
68 /* Stop debugging the process whose number is PID
69 and continue it with signal number SIGNAL.
70 SIGNAL = 0 means just continue it. */
77 ptrace (PT_DETACH
, inferior_pid
, (PTRACE_ARG3_TYPE
) 1, signal
, 0);
79 perror_with_name ("ptrace");
83 /* Fetch all registers, or just one, from the child process. */
86 fetch_inferior_registers (regno
)
90 for (regno
= 0; regno
< NUM_REGS
; regno
++)
91 fetch_register (regno
);
93 fetch_register (regno
);
96 /* Store our register values back into the inferior.
97 If REGNO is -1, do this for all registers.
98 Otherwise, REGNO specifies which register (so we can save time). */
101 store_inferior_registers (regno
)
104 register unsigned int regaddr
;
106 extern char registers
[];
109 unsigned int offset
= U_REGS_OFFSET
;
113 regaddr
= register_addr (regno
, offset
);
114 for (i
= 0; i
< REGISTER_RAW_SIZE (regno
); i
+= sizeof(int))
117 ptrace (PT_WUAREA
, inferior_pid
, (PTRACE_ARG3_TYPE
) regaddr
,
118 *(int *) ®isters
[REGISTER_BYTE (regno
) + i
], 0);
121 sprintf (buf
, "writing register number %d(%d)", regno
, i
);
122 perror_with_name (buf
);
124 regaddr
+= sizeof(int);
129 for (regno
= 0; regno
< NUM_REGS
; regno
++)
131 regaddr
= register_addr (regno
, offset
);
132 for (i
= 0; i
< REGISTER_RAW_SIZE (regno
); i
+= sizeof(int))
135 ptrace (PT_WUAREA
, inferior_pid
, (PTRACE_ARG3_TYPE
) regaddr
,
136 *(int *) ®isters
[REGISTER_BYTE (regno
) + i
], 0);
139 sprintf (buf
, "writing register number %d(%d)", regno
, i
);
140 perror_with_name (buf
);
142 regaddr
+= sizeof(int);
149 /* KERNEL_U_ADDR is the amount to subtract from u.u_ar0
150 to get the offset in the core file of the register values. */
152 /* Get kernel_u_addr using HPUX-style nlist(). */
153 CORE_ADDR kernel_u_addr
;
158 unsigned char n_type
;
159 unsigned char n_length
;
163 static struct hpnlist nl
[] = {{ "_u", -1, }, { (char *) 0, }};
165 /* read the value of the u area from the hp-ux kernel */
166 void _initialize_kernel_u_addr ()
171 nlist ("/hp-ux", &nl
);
172 kernel_u_addr
= nl
[0].n_value
;
175 #if !defined (offsetof)
176 #define offsetof(TYPE, MEMBER) ((unsigned long) &((TYPE *)0)->MEMBER)
179 /* U_REGS_OFFSET is the offset of the registers within the u area. */
180 #if !defined (U_REGS_OFFSET)
181 #define U_REGS_OFFSET \
182 ptrace (PT_READ_U, inferior_pid, \
183 (PTRACE_ARG3_TYPE) (offsetof (struct user, u_ar0)), 0, 0) \
187 /* Fetch one register. */
190 fetch_register (regno
)
193 register unsigned int regaddr
;
194 char buf
[MAX_REGISTER_RAW_SIZE
];
195 char mess
[128]; /* For messages */
198 /* Offset of registers within the u area. */
201 offset
= U_REGS_OFFSET
;
203 regaddr
= register_addr (regno
, offset
);
204 for (i
= 0; i
< REGISTER_RAW_SIZE (regno
); i
+= sizeof (int))
207 *(int *) &buf
[i
] = ptrace (PT_RUREGS
, inferior_pid
,
208 (PTRACE_ARG3_TYPE
) regaddr
, 0, 0);
209 regaddr
+= sizeof (int);
212 sprintf (mess
, "reading register %s (#%d)", reg_names
[regno
], regno
);
213 perror_with_name (mess
);
216 supply_register (regno
, buf
);
221 /* Resume execution of the inferior process.
222 If STEP is nonzero, single-step it.
223 If SIGNAL is nonzero, give it that signal. */
226 child_resume (step
, signal
)
232 /* An address of (PTRACE_ARG3_TYPE) 1 tells ptrace to continue from where
233 it was. (If GDB wanted it to start some other way, we have already
234 written a new PC value to the child.) */
237 ptrace (PT_SINGLE
, inferior_pid
, (PTRACE_ARG3_TYPE
) 1, signal
, 0);
239 ptrace (PT_CONTIN
, inferior_pid
, (PTRACE_ARG3_TYPE
) 1, signal
, 0);
242 perror_with_name ("ptrace");
245 /* NOTE! I tried using PTRACE_READDATA, etc., to read and write memory
246 in the NEW_SUN_PTRACE case.
247 It ought to be straightforward. But it appears that writing did
248 not write the data that I specified. I cannot understand where
249 it got the data that it actually did write. */
251 /* Copy LEN bytes to or from inferior's memory starting at MEMADDR
252 to debugger memory starting at MYADDR. Copy to inferior if
255 Returns the length copied, which is either the LEN argument or zero.
256 This xfer function does not do partial moves, since child_ops
257 doesn't allow memory operations to cross below us in the target stack
261 child_xfer_memory (memaddr
, myaddr
, len
, write
, target
)
266 struct target_ops
*target
; /* ignored */
269 /* Round starting address down to longword boundary. */
270 register CORE_ADDR addr
= memaddr
& - sizeof (int);
271 /* Round ending address up; get number of longwords that makes. */
273 = (((memaddr
+ len
) - addr
) + sizeof (int) - 1) / sizeof (int);
274 /* Allocate buffer of that many longwords. */
275 register int *buffer
= (int *) alloca (count
* sizeof (int));
279 /* Fill start and end extra bytes of buffer with existing memory data. */
281 if (addr
!= memaddr
|| len
< (int)sizeof (int)) {
282 /* Need part of initial word -- fetch it. */
283 buffer
[0] = ptrace (PT_RIUSER
, inferior_pid
,
284 (PTRACE_ARG3_TYPE
) addr
, 0, 0);
287 if (count
> 1) /* FIXME, avoid if even boundary */
290 = ptrace (PT_RIUSER
, inferior_pid
,
291 (PTRACE_ARG3_TYPE
) (addr
+ (count
- 1) * sizeof (int)),
295 /* Copy data to be written over corresponding part of buffer */
297 bcopy (myaddr
, (char *) buffer
+ (memaddr
& (sizeof (int) - 1)), len
);
299 /* Write the entire buffer. */
301 for (i
= 0; i
< count
; i
++, addr
+= sizeof (int))
304 /* The HP-UX kernel crashes if you use PT_WDUSER to write into the text
305 segment. FIXME -- does it work to write into the data segment using
306 WIUSER, or do these idiots really expect us to figure out which segment
307 the address is in, so we can use a separate system call for it??! */
309 ptrace (PT_WDUSER
, inferior_pid
, (PTRACE_ARG3_TYPE
) addr
,
314 /* Using the appropriate one (I or D) is necessary for
315 Gould NP1, at least. */
317 ptrace (PT_WIUSER
, inferior_pid
, (PTRACE_ARG3_TYPE
) addr
,
326 /* Read all the longwords */
327 for (i
= 0; i
< count
; i
++, addr
+= sizeof (int))
330 buffer
[i
] = ptrace (PT_RIUSER
, inferior_pid
,
331 (PTRACE_ARG3_TYPE
) addr
, 0, 0);
337 /* Copy appropriate bytes out of the buffer. */
338 bcopy ((char *) buffer
+ (memaddr
& (sizeof (int) - 1)), myaddr
, len
);
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