1 /* Machine-dependent code which would otherwise be in infptrace.c,
2 for GDB, the GNU debugger. This code is for the HP PA-RISC cpu.
3 Copyright 1986, 1987, 1989, 1990, 1991, 1992 Free Software Foundation, Inc.
5 Contributed by the Center for Software Science at the
6 University of Utah (pa-gdb-bugs@cs.utah.edu).
8 This file is part of GDB.
10 This program is free software; you can redistribute it and/or modify
11 it under the terms of the GNU General Public License as published by
12 the Free Software Foundation; either version 2 of the License, or
13 (at your option) any later version.
15 This program is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU General Public License for more details.
20 You should have received a copy of the GNU General Public License
21 along with this program; if not, write to the Free Software
22 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
30 #include <sys/types.h>
33 #include <sys/param.h>
36 #include <sys/ioctl.h>
38 #include <sys/ptrace.h>
42 #define PT_ATTACH PTRACE_ATTACH
45 #define PT_DETACH PTRACE_DETACH
49 #include <sys/user.h> /* After a.out.h */
53 /* This function simply calls ptrace with the given arguments.
54 It exists so that all calls to ptrace are isolated in this
55 machine-dependent file. */
57 call_ptrace (request
, pid
, addr
, data
)
59 PTRACE_ARG3_TYPE addr
;
62 return ptrace (request
, pid
, addr
, data
, 0);
66 /* For the rest of the file, use an extra level of indirection */
67 /* This lets us breakpoint usefully on call_ptrace. */
68 #define ptrace call_ptrace
74 if (inferior_pid
== 0)
76 ptrace (PT_EXIT
, inferior_pid
, (PTRACE_ARG3_TYPE
) 0, 0, 0); /* PT_EXIT = PT_KILL ? */
78 target_mourn_inferior ();
81 /* Resume execution of the inferior process.
82 If STEP is nonzero, single-step it.
83 If SIGNAL is nonzero, give it that signal. */
86 child_resume (step
, signal
)
92 /* An address of (PTRACE_ARG3_TYPE) 1 tells ptrace to continue from where
93 it was. (If GDB wanted it to start some other way, we have already
94 written a new PC value to the child.) */
97 ptrace (PT_SINGLE
, inferior_pid
, (PTRACE_ARG3_TYPE
) 1, signal
, 0);
99 ptrace (PT_CONTIN
, inferior_pid
, (PTRACE_ARG3_TYPE
) 1, signal
, 0);
102 perror_with_name ("ptrace");
106 /* Nonzero if we are debugging an attached process rather than
108 extern int attach_flag
;
110 /* Start debugging the process whose number is PID. */
116 ptrace (PT_ATTACH
, pid
, (PTRACE_ARG3_TYPE
) 0, 0, 0);
118 perror_with_name ("ptrace");
123 /* Stop debugging the process whose number is PID
124 and continue it with signal number SIGNAL.
125 SIGNAL = 0 means just continue it. */
132 ptrace (PT_DETACH
, inferior_pid
, (PTRACE_ARG3_TYPE
) 1, signal
, 0);
134 perror_with_name ("ptrace");
137 #endif /* ATTACH_DETACH */
139 #if !defined (FETCH_INFERIOR_REGISTERS)
141 /* KERNEL_U_ADDR is the amount to subtract from u.u_ar0
142 to get the offset in the core file of the register values. */
143 #if defined (KERNEL_U_ADDR_BSD)
144 /* Get kernel_u_addr using BSD-style nlist(). */
145 CORE_ADDR kernel_u_addr
;
147 #include <a.out.gnu.h> /* For struct nlist */
150 _initialize_kernel_u_addr ()
152 struct nlist names
[2];
154 names
[0].n_un
.n_name
= "_u";
155 names
[1].n_un
.n_name
= NULL
;
156 if (nlist ("/vmunix", names
) == 0)
157 kernel_u_addr
= names
[0].n_value
;
159 fatal ("Unable to get kernel u area address.");
161 #endif /* KERNEL_U_ADDR_BSD. */
163 #if defined (KERNEL_U_ADDR_HPUX)
164 /* Get kernel_u_addr using HPUX-style nlist(). */
165 CORE_ADDR kernel_u_addr
;
170 unsigned char n_type
;
171 unsigned char n_length
;
175 static struct hpnlist nl
[] = {{ "_u", -1, }, { (char *) 0, }};
177 /* read the value of the u area from the hp-ux kernel */
178 void _initialize_kernel_u_addr ()
181 nlist ("/hp-ux", &nl
);
182 kernel_u_addr
= nl
[0].n_value
;
184 #endif /* KERNEL_U_ADDR_HPUX. */
186 #if !defined (offsetof)
187 #define offsetof(TYPE, MEMBER) ((unsigned long) &((TYPE *)0)->MEMBER)
190 /* U_REGS_OFFSET is the offset of the registers within the u area. */
191 #if !defined (U_REGS_OFFSET)
192 #define U_REGS_OFFSET \
193 ptrace (PT_READ_U, inferior_pid, \
194 (PTRACE_ARG3_TYPE) (offsetof (struct user, u_ar0)), 0, 0) \
198 /* Registers we shouldn't try to fetch. */
199 #if !defined (CANNOT_FETCH_REGISTER)
200 #define CANNOT_FETCH_REGISTER(regno) 0
203 /* Fetch one register. */
206 fetch_register (regno
)
209 register unsigned int regaddr
;
210 char buf
[MAX_REGISTER_RAW_SIZE
];
211 char mess
[128]; /* For messages */
214 /* Offset of registers within the u area. */
217 if (CANNOT_FETCH_REGISTER (regno
))
219 bzero (buf
, REGISTER_RAW_SIZE (regno
)); /* Supply zeroes */
220 supply_register (regno
, buf
);
224 offset
= U_REGS_OFFSET
;
226 regaddr
= register_addr (regno
, offset
);
227 for (i
= 0; i
< REGISTER_RAW_SIZE (regno
); i
+= sizeof (int))
230 *(int *) &buf
[i
] = ptrace (PT_RUREGS
, inferior_pid
,
231 (PTRACE_ARG3_TYPE
) regaddr
, 0, 0);
232 regaddr
+= sizeof (int);
235 sprintf (mess
, "reading register %s (#%d)", reg_names
[regno
], regno
);
236 perror_with_name (mess
);
239 if (regno
== PCOQ_HEAD_REGNUM
|| regno
== PCOQ_TAIL_REGNUM
)
241 supply_register (regno
, buf
);
245 /* Fetch all registers, or just one, from the child process. */
248 fetch_inferior_registers (regno
)
252 for (regno
= 0; regno
< NUM_REGS
; regno
++)
253 fetch_register (regno
);
255 fetch_register (regno
);
258 /* Registers we shouldn't try to store. */
259 #if !defined (CANNOT_STORE_REGISTER)
260 #define CANNOT_STORE_REGISTER(regno) 0
263 /* Store our register values back into the inferior.
264 If REGNO is -1, do this for all registers.
265 Otherwise, REGNO specifies which register (so we can save time). */
268 store_inferior_registers (regno
)
271 register unsigned int regaddr
;
273 extern char registers
[];
276 unsigned int offset
= U_REGS_OFFSET
;
280 regaddr
= register_addr (regno
, offset
);
281 for (i
= 0; i
< REGISTER_RAW_SIZE (regno
); i
+= sizeof(int))
284 ptrace (PT_WUAREA
, inferior_pid
, (PTRACE_ARG3_TYPE
) regaddr
,
285 *(int *) ®isters
[REGISTER_BYTE (regno
) + i
], 0);
288 sprintf (buf
, "writing register number %d(%d)", regno
, i
);
289 perror_with_name (buf
);
291 regaddr
+= sizeof(int);
296 for (regno
= 0; regno
< NUM_REGS
; regno
++)
298 if (CANNOT_STORE_REGISTER (regno
))
300 regaddr
= register_addr (regno
, offset
);
301 for (i
= 0; i
< REGISTER_RAW_SIZE (regno
); i
+= sizeof(int))
304 ptrace (PT_WUAREA
, inferior_pid
, (PTRACE_ARG3_TYPE
) regaddr
,
305 *(int *) ®isters
[REGISTER_BYTE (regno
) + i
], 0);
308 sprintf (buf
, "writing register number %d(%d)", regno
, i
);
309 perror_with_name (buf
);
311 regaddr
+= sizeof(int);
317 #endif /* !defined (FETCH_INFERIOR_REGISTERS). */
319 /* NOTE! I tried using PTRACE_READDATA, etc., to read and write memory
320 in the NEW_SUN_PTRACE case.
321 It ought to be straightforward. But it appears that writing did
322 not write the data that I specified. I cannot understand where
323 it got the data that it actually did write. */
325 /* Copy LEN bytes to or from inferior's memory starting at MEMADDR
326 to debugger memory starting at MYADDR. Copy to inferior if
329 Returns the length copied, which is either the LEN argument or zero.
330 This xfer function does not do partial moves, since child_ops
331 doesn't allow memory operations to cross below us in the target stack
335 child_xfer_memory (memaddr
, myaddr
, len
, write
, target
)
340 struct target_ops
*target
; /* ignored */
343 /* Round starting address down to longword boundary. */
344 register CORE_ADDR addr
= memaddr
& - sizeof (int);
345 /* Round ending address up; get number of longwords that makes. */
347 = (((memaddr
+ len
) - addr
) + sizeof (int) - 1) / sizeof (int);
348 /* Allocate buffer of that many longwords. */
349 register int *buffer
= (int *) alloca (count
* sizeof (int));
353 /* Fill start and end extra bytes of buffer with existing memory data. */
355 if (addr
!= memaddr
|| len
< (int)sizeof (int)) {
356 /* Need part of initial word -- fetch it. */
357 buffer
[0] = ptrace (PT_RIUSER
, inferior_pid
,
358 (PTRACE_ARG3_TYPE
) addr
, 0, 0);
361 if (count
> 1) /* FIXME, avoid if even boundary */
364 = ptrace (PT_RIUSER
, inferior_pid
,
365 (PTRACE_ARG3_TYPE
) (addr
+ (count
- 1) * sizeof (int)),
369 /* Copy data to be written over corresponding part of buffer */
371 bcopy (myaddr
, (char *) buffer
+ (memaddr
& (sizeof (int) - 1)), len
);
373 /* Write the entire buffer. */
375 for (i
= 0; i
< count
; i
++, addr
+= sizeof (int))
378 /* The HP-UX kernel crashes if you use PT_WDUSER to write into the text
379 segment. FIXME -- does it work to write into the data segment using
380 WIUSER, or do these idiots really expect us to figure out which segment
381 the address is in, so we can use a separate system call for it??! */
383 ptrace (PT_WDUSER
, inferior_pid
, (PTRACE_ARG3_TYPE
) addr
,
388 /* Using the appropriate one (I or D) is necessary for
389 Gould NP1, at least. */
391 ptrace (PT_WIUSER
, inferior_pid
, (PTRACE_ARG3_TYPE
) addr
,
400 /* Read all the longwords */
401 for (i
= 0; i
< count
; i
++, addr
+= sizeof (int))
404 buffer
[i
] = ptrace (PT_RIUSER
, inferior_pid
,
405 (PTRACE_ARG3_TYPE
) addr
, 0, 0);
411 /* Copy appropriate bytes out of the buffer. */
412 bcopy ((char *) buffer
+ (memaddr
& (sizeof (int) - 1)), myaddr
, len
);