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., 59 Temple Place - Suite 330,
24 Boston, MA 02111-1307, USA. */
29 #include <sys/ptrace.h>
31 /* Use an extra level of indirection for ptrace calls.
32 This lets us breakpoint usefully on call_ptrace. It also
33 allows us to pass an extra argument to ptrace without
34 using an ANSI-C specific macro. */
36 #define ptrace call_ptrace
38 #if !defined (offsetof)
39 #define offsetof(TYPE, MEMBER) ((unsigned long) &((TYPE *)0)->MEMBER)
42 /* U_REGS_OFFSET is the offset of the registers within the u area. */
43 #if !defined (U_REGS_OFFSET)
44 #define U_REGS_OFFSET \
45 ptrace (PT_READ_U, inferior_pid, \
46 (PTRACE_ARG3_TYPE) (offsetof (struct user, u_ar0)), 0) \
50 /* Fetch one register. */
53 fetch_register (int regno
)
55 register unsigned int regaddr
;
56 char buf
[MAX_REGISTER_RAW_SIZE
];
59 /* Offset of registers within the u area. */
62 offset
= U_REGS_OFFSET
;
64 regaddr
= register_addr (regno
, offset
);
65 for (i
= 0; i
< REGISTER_RAW_SIZE (regno
); i
+= sizeof (int))
68 *(int *) &buf
[i
] = ptrace (PT_RUREGS
, inferior_pid
,
69 (PTRACE_ARG3_TYPE
) regaddr
, 0);
70 regaddr
+= sizeof (int);
73 /* Warning, not error, in case we are attached; sometimes the
74 kernel doesn't let us at the registers. */
75 char *err
= safe_strerror (errno
);
76 char *msg
= alloca (strlen (err
) + 128);
77 sprintf (msg
, "reading register %s: %s", REGISTER_NAME (regno
), err
);
82 supply_register (regno
, buf
);
86 /* Fetch all registers, or just one, from the child process. */
89 fetch_inferior_registers (int regno
)
92 for (regno
= 0; regno
< NUM_REGS
; regno
++)
93 fetch_register (regno
);
95 fetch_register (regno
);
98 /* Store our register values back into the inferior.
99 If REGNO is -1, do this for all registers.
100 Otherwise, REGNO specifies which register (so we can save time). */
103 store_inferior_registers (int regno
)
105 register unsigned int regaddr
;
108 unsigned int offset
= U_REGS_OFFSET
;
113 if (CANNOT_STORE_REGISTER (regno
))
115 regaddr
= register_addr (regno
, offset
);
117 if (regno
== PCOQ_HEAD_REGNUM
|| regno
== PCOQ_TAIL_REGNUM
)
119 scratch
= *(int *) ®isters
[REGISTER_BYTE (regno
)] | 0x3;
120 ptrace (PT_WUREGS
, inferior_pid
, (PTRACE_ARG3_TYPE
) regaddr
,
124 /* Error, even if attached. Failing to write these two
125 registers is pretty serious. */
126 sprintf (buf
, "writing register number %d", regno
);
127 perror_with_name (buf
);
131 for (i
= 0; i
< REGISTER_RAW_SIZE (regno
); i
+= sizeof (int))
134 ptrace (PT_WUREGS
, inferior_pid
, (PTRACE_ARG3_TYPE
) regaddr
,
135 *(int *) ®isters
[REGISTER_BYTE (regno
) + i
]);
138 /* Warning, not error, in case we are attached; sometimes the
139 kernel doesn't let us at the registers. */
140 char *err
= safe_strerror (errno
);
141 char *msg
= alloca (strlen (err
) + 128);
142 sprintf (msg
, "writing register %s: %s",
143 REGISTER_NAME (regno
), err
);
147 regaddr
+= sizeof (int);
151 for (regno
= 0; regno
< NUM_REGS
; regno
++)
152 store_inferior_registers (regno
);
155 /* PT_PROT is specific to the PA BSD kernel and isn't documented
156 anywhere (except here).
158 PT_PROT allows one to enable/disable the data memory break bit
159 for pages of memory in an inferior process. This bit is used
160 to cause "Data memory break traps" to occur when the appropriate
163 The arguments are as follows:
165 PT_PROT -- The ptrace action to perform.
167 INFERIOR_PID -- The pid of the process who's page table entries
170 PT_ARGS -- The *address* of a 3 word block of memory which has
171 additional information:
173 word 0 -- The start address to watch. This should be a page-aligned
176 word 1 -- The ending address to watch. Again, this should be a
177 page aligned address.
179 word 2 -- Nonzero to enable the data memory break bit on the
180 given address range or zero to disable the data memory break
181 bit on the given address range.
183 This call may fail if the given addresses are not valid in the inferior
184 process. This most often happens when restarting a program which
185 as watchpoints inserted on heap or stack memory. */
190 hppa_set_watchpoint (int addr
, int len
, int flag
)
194 pt_args
[1] = addr
+ len
;
197 /* Mask off the lower 12 bits since we want to work on a page basis. */
201 /* Rounding adjustments. */
202 pt_args
[1] -= pt_args
[0];
205 /* Put the lower 12 bits back as zero. */
210 return ptrace (PT_PROT
, inferior_pid
, (PTRACE_ARG3_TYPE
) pt_args
, 0);
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