1 /* Machine-dependent hooks for the unix child process stratum, for HPUX PA-RISC.
3 Copyright 1986, 1987, 1989, 1990, 1991, 1992, 1993
4 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 extern CORE_ADDR text_end
;
33 static void fetch_register ();
36 fetch_inferior_registers (regno
)
40 for (regno
= 0; regno
< NUM_REGS
; regno
++)
41 fetch_register (regno
);
43 fetch_register (regno
);
46 /* Store our register values back into the inferior.
47 If REGNO is -1, do this for all registers.
48 Otherwise, REGNO specifies which register (so we can save time). */
51 store_inferior_registers (regno
)
54 register unsigned int regaddr
;
56 extern char registers
[];
58 unsigned int offset
= U_REGS_OFFSET
;
63 regaddr
= register_addr (regno
, offset
);
65 if (regno
== PCOQ_HEAD_REGNUM
|| regno
== PCOQ_TAIL_REGNUM
)
67 scratch
= *(int *) ®isters
[REGISTER_BYTE (regno
)] | 0x3;
68 ptrace (PT_WUREGS
, inferior_pid
, (PTRACE_ARG3_TYPE
) regaddr
,
72 /* Error, even if attached. Failing to write these two
73 registers is pretty serious. */
74 sprintf (buf
, "writing register number %d", regno
);
75 perror_with_name (buf
);
79 for (i
= 0; i
< REGISTER_RAW_SIZE (regno
); i
+= sizeof(int))
82 ptrace (PT_WUREGS
, inferior_pid
, (PTRACE_ARG3_TYPE
) regaddr
,
83 *(int *) ®isters
[REGISTER_BYTE (regno
) + i
], 0);
86 /* Warning, not error, in case we are attached; sometimes the
87 kernel doesn't let us at the registers. */
88 char *err
= safe_strerror (errno
);
89 char *msg
= alloca (strlen (err
) + 128);
90 sprintf (msg
, "writing register %s: %s",
91 reg_names
[regno
], err
);
95 regaddr
+= sizeof(int);
100 for (regno
= 0; regno
< NUM_REGS
; regno
++)
102 if (CANNOT_STORE_REGISTER (regno
))
104 store_inferior_registers (regno
);
111 /* Fetch one register. */
114 fetch_register (regno
)
117 register unsigned int regaddr
;
118 char buf
[MAX_REGISTER_RAW_SIZE
];
119 char mess
[128]; /* For messages */
122 /* Offset of registers within the u area. */
125 offset
= U_REGS_OFFSET
;
127 regaddr
= register_addr (regno
, offset
);
128 for (i
= 0; i
< REGISTER_RAW_SIZE (regno
); i
+= sizeof (int))
131 *(int *) &buf
[i
] = ptrace (PT_RUREGS
, inferior_pid
,
132 (PTRACE_ARG3_TYPE
) regaddr
, 0, 0);
133 regaddr
+= sizeof (int);
136 /* Warning, not error, in case we are attached; sometimes the
137 kernel doesn't let us at the registers. */
138 char *err
= safe_strerror (errno
);
139 char *msg
= alloca (strlen (err
) + 128);
140 sprintf (msg
, "reading register %s: %s", reg_names
[regno
], err
);
145 if (regno
== PCOQ_HEAD_REGNUM
|| regno
== PCOQ_TAIL_REGNUM
)
147 supply_register (regno
, buf
);
151 /* Copy LEN bytes to or from inferior's memory starting at MEMADDR
152 to debugger memory starting at MYADDR. Copy to inferior if
155 Returns the length copied, which is either the LEN argument or zero.
156 This xfer function does not do partial moves, since child_ops
157 doesn't allow memory operations to cross below us in the target stack
161 child_xfer_memory (memaddr
, myaddr
, len
, write
, target
)
166 struct target_ops
*target
; /* ignored */
169 /* Round starting address down to longword boundary. */
170 register CORE_ADDR addr
= memaddr
& - sizeof (int);
171 /* Round ending address up; get number of longwords that makes. */
173 = (((memaddr
+ len
) - addr
) + sizeof (int) - 1) / sizeof (int);
174 /* Allocate buffer of that many longwords. */
175 register int *buffer
= (int *) alloca (count
* sizeof (int));
179 /* Fill start and end extra bytes of buffer with existing memory data. */
181 if (addr
!= memaddr
|| len
< (int)sizeof (int)) {
182 /* Need part of initial word -- fetch it. */
183 buffer
[0] = ptrace (addr
< text_end
? PT_RIUSER
: PT_RDUSER
,
184 inferior_pid
, (PTRACE_ARG3_TYPE
) addr
, 0, 0);
187 if (count
> 1) /* FIXME, avoid if even boundary */
190 = ptrace (addr
< text_end
? PT_RIUSER
: PT_RDUSER
, inferior_pid
,
191 (PTRACE_ARG3_TYPE
) (addr
+ (count
- 1) * sizeof (int)),
195 /* Copy data to be written over corresponding part of buffer */
197 memcpy ((char *) buffer
+ (memaddr
& (sizeof (int) - 1)), myaddr
, len
);
199 /* Write the entire buffer. */
201 for (i
= 0; i
< count
; i
++, addr
+= sizeof (int))
203 /* The HP-UX kernel crashes if you use PT_WDUSER to write into the text
204 segment. FIXME -- does it work to write into the data segment using
205 WIUSER, or do these idiots really expect us to figure out which segment
206 the address is in, so we can use a separate system call for it??! */
208 ptrace (addr
< text_end
? PT_WIUSER
: PT_WDUSER
, inferior_pid
,
209 (PTRACE_ARG3_TYPE
) addr
,
217 /* Read all the longwords */
218 for (i
= 0; i
< count
; i
++, addr
+= sizeof (int))
221 buffer
[i
] = ptrace (addr
< text_end
? PT_RIUSER
: PT_RDUSER
,
222 inferior_pid
, (PTRACE_ARG3_TYPE
) addr
, 0, 0);
228 /* Copy appropriate bytes out of the buffer. */
229 memcpy (myaddr
, (char *) buffer
+ (memaddr
& (sizeof (int) - 1)), len
);
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