Update/correct copyright notices.
[deliverable/binutils-gdb.git] / gdb / hppab-nat.c
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c906108c
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1/* Machine-dependent hooks for the unix child process stratum. This
2 code is for the HP PA-RISC cpu.
3
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4 Copyright 1986, 1987, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1998,
5 1999, 2000, 2001 Free Software Foundation, Inc.
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6
7 Contributed by the Center for Software Science at the
8 University of Utah (pa-gdb-bugs@cs.utah.edu).
9
c5aa993b 10 This file is part of GDB.
c906108c 11
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12 This program is free software; you can redistribute it and/or modify
13 it under the terms of the GNU General Public License as published by
14 the Free Software Foundation; either version 2 of the License, or
15 (at your option) any later version.
c906108c 16
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17 This program is distributed in the hope that it will be useful,
18 but WITHOUT ANY WARRANTY; without even the implied warranty of
19 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 GNU General Public License for more details.
c906108c 21
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22 You should have received a copy of the GNU General Public License
23 along with this program; if not, write to the Free Software
24 Foundation, Inc., 59 Temple Place - Suite 330,
25 Boston, MA 02111-1307, USA. */
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26
27#include "defs.h"
28#include "inferior.h"
29#include "target.h"
4e052eda 30#include "regcache.h"
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31#include <sys/ptrace.h>
32
33/* Use an extra level of indirection for ptrace calls.
34 This lets us breakpoint usefully on call_ptrace. It also
35 allows us to pass an extra argument to ptrace without
36 using an ANSI-C specific macro. */
37
38#define ptrace call_ptrace
39
40#if !defined (offsetof)
41#define offsetof(TYPE, MEMBER) ((unsigned long) &((TYPE *)0)->MEMBER)
42#endif
43
44/* U_REGS_OFFSET is the offset of the registers within the u area. */
45#if !defined (U_REGS_OFFSET)
46#define U_REGS_OFFSET \
47 ptrace (PT_READ_U, inferior_pid, \
48 (PTRACE_ARG3_TYPE) (offsetof (struct user, u_ar0)), 0) \
49 - KERNEL_U_ADDR
50#endif
51
52/* Fetch one register. */
53
54static void
fba45db2 55fetch_register (int regno)
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56{
57 register unsigned int regaddr;
58 char buf[MAX_REGISTER_RAW_SIZE];
59 register int i;
60
61 /* Offset of registers within the u area. */
62 unsigned int offset;
63
64 offset = U_REGS_OFFSET;
65
66 regaddr = register_addr (regno, offset);
67 for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (int))
68 {
69 errno = 0;
70 *(int *) &buf[i] = ptrace (PT_RUREGS, inferior_pid,
71 (PTRACE_ARG3_TYPE) regaddr, 0);
72 regaddr += sizeof (int);
73 if (errno != 0)
74 {
75 /* Warning, not error, in case we are attached; sometimes the
76 kernel doesn't let us at the registers. */
77 char *err = safe_strerror (errno);
78 char *msg = alloca (strlen (err) + 128);
79 sprintf (msg, "reading register %s: %s", REGISTER_NAME (regno), err);
80 warning (msg);
81 goto error_exit;
82 }
83 }
84 supply_register (regno, buf);
c5aa993b 85error_exit:;
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86}
87
88/* Fetch all registers, or just one, from the child process. */
89
90void
fba45db2 91fetch_inferior_registers (int regno)
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92{
93 if (regno == -1)
94 for (regno = 0; regno < NUM_REGS; regno++)
95 fetch_register (regno);
96 else
97 fetch_register (regno);
98}
99
100/* Store our register values back into the inferior.
101 If REGNO is -1, do this for all registers.
102 Otherwise, REGNO specifies which register (so we can save time). */
103
104void
fba45db2 105store_inferior_registers (int regno)
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106{
107 register unsigned int regaddr;
108 char buf[80];
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109 register int i;
110 unsigned int offset = U_REGS_OFFSET;
111 int scratch;
112
113 if (regno >= 0)
114 {
115 if (CANNOT_STORE_REGISTER (regno))
116 return;
117 regaddr = register_addr (regno, offset);
118 errno = 0;
119 if (regno == PCOQ_HEAD_REGNUM || regno == PCOQ_TAIL_REGNUM)
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120 {
121 scratch = *(int *) &registers[REGISTER_BYTE (regno)] | 0x3;
122 ptrace (PT_WUREGS, inferior_pid, (PTRACE_ARG3_TYPE) regaddr,
123 scratch);
124 if (errno != 0)
125 {
c906108c 126 /* Error, even if attached. Failing to write these two
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127 registers is pretty serious. */
128 sprintf (buf, "writing register number %d", regno);
129 perror_with_name (buf);
130 }
131 }
c906108c 132 else
c5aa993b 133 for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (int))
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134 {
135 errno = 0;
136 ptrace (PT_WUREGS, inferior_pid, (PTRACE_ARG3_TYPE) regaddr,
137 *(int *) &registers[REGISTER_BYTE (regno) + i]);
138 if (errno != 0)
139 {
140 /* Warning, not error, in case we are attached; sometimes the
141 kernel doesn't let us at the registers. */
142 char *err = safe_strerror (errno);
143 char *msg = alloca (strlen (err) + 128);
144 sprintf (msg, "writing register %s: %s",
145 REGISTER_NAME (regno), err);
146 warning (msg);
147 return;
148 }
c5aa993b 149 regaddr += sizeof (int);
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150 }
151 }
152 else
153 for (regno = 0; regno < NUM_REGS; regno++)
154 store_inferior_registers (regno);
155}
156
157/* PT_PROT is specific to the PA BSD kernel and isn't documented
158 anywhere (except here).
159
160 PT_PROT allows one to enable/disable the data memory break bit
161 for pages of memory in an inferior process. This bit is used
162 to cause "Data memory break traps" to occur when the appropriate
163 page is written to.
164
165 The arguments are as follows:
166
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167 PT_PROT -- The ptrace action to perform.
168
169 INFERIOR_PID -- The pid of the process who's page table entries
170 will be modified.
c906108c 171
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172 PT_ARGS -- The *address* of a 3 word block of memory which has
173 additional information:
c906108c 174
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175 word 0 -- The start address to watch. This should be a page-aligned
176 address.
c906108c 177
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178 word 1 -- The ending address to watch. Again, this should be a
179 page aligned address.
c906108c 180
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181 word 2 -- Nonzero to enable the data memory break bit on the
182 given address range or zero to disable the data memory break
183 bit on the given address range.
c906108c 184
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185 This call may fail if the given addresses are not valid in the inferior
186 process. This most often happens when restarting a program which
7e73cedf 187 has watchpoints inserted on heap or stack memory. */
c906108c 188
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189#define PT_PROT 21
190
191int
fba45db2 192hppa_set_watchpoint (int addr, int len, int flag)
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193{
194 int pt_args[3];
195 pt_args[0] = addr;
196 pt_args[1] = addr + len;
197 pt_args[2] = flag;
198
199 /* Mask off the lower 12 bits since we want to work on a page basis. */
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200 pt_args[0] >>= 12;
201 pt_args[1] >>= 12;
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202
203 /* Rounding adjustments. */
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204 pt_args[1] -= pt_args[0];
205 pt_args[1]++;
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206
207 /* Put the lower 12 bits back as zero. */
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208 pt_args[0] <<= 12;
209 pt_args[1] <<= 12;
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210
211 /* Do it. */
212 return ptrace (PT_PROT, inferior_pid, (PTRACE_ARG3_TYPE) pt_args, 0);
213}
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