1/* Native-dependent code for Alpha BSD's.
2
3   Copyright 2000, 2001, 2002, 2004, 2005 Free Software Foundation, Inc.
4
5   This file is part of GDB.
6
7   This program is free software; you can redistribute it and/or modify
8   it under the terms of the GNU General Public License as published by
9   the Free Software Foundation; either version 2 of the License, or
10   (at your option) any later version.
11
12   This program is distributed in the hope that it will be useful,
13   but WITHOUT ANY WARRANTY; without even the implied warranty of
14   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15   GNU General Public License for more details.
16
17   You should have received a copy of the GNU General Public License
18   along with this program; if not, write to the Free Software
19   Foundation, Inc., 59 Temple Place - Suite 330,
20   Boston, MA 02111-1307, USA.  */
21
22#include "defs.h"
23#include "inferior.h"
24#include "regcache.h"
25
26#include "alpha-tdep.h"
27#include "alphabsd-tdep.h"
28#include "inf-ptrace.h"
29
30#include <sys/types.h>
31#include <sys/ptrace.h>
32#include <machine/reg.h>
33
34#ifdef HAVE_SYS_PROCFS_H
35#include <sys/procfs.h>
36#endif
37
38#ifndef HAVE_GREGSET_T
39typedef struct reg gregset_t;
40#endif
41
42#ifndef HAVE_FPREGSET_T
43typedef struct fpreg fpregset_t;
44#endif
45
46#include "gregset.h"
47
48/* Provide *regset() wrappers around the generic Alpha BSD register
49   supply/fill routines.  */
50
51void
52supply_gregset (gregset_t *gregsetp)
53{
54  alphabsd_supply_reg ((char *) gregsetp, -1);
55}
56
57void
58fill_gregset (gregset_t *gregsetp, int regno)
59{
60  alphabsd_fill_reg ((char *) gregsetp, regno);
61}
62
63void
64supply_fpregset (fpregset_t *fpregsetp)
65{
66  alphabsd_supply_fpreg ((char *) fpregsetp, -1);
67}
68
69void
70fill_fpregset (fpregset_t *fpregsetp, int regno)
71{
72  alphabsd_fill_fpreg ((char *) fpregsetp, regno);
73}
74
75/* Determine if PT_GETREGS fetches this register.  */
76
77static int
78getregs_supplies (int regno)
79{
80  return ((regno >= ALPHA_V0_REGNUM && regno <= ALPHA_ZERO_REGNUM)
81	  || regno >= ALPHA_PC_REGNUM);
82}
83
84/* Fetch register REGNO from the inferior.  If REGNO is -1, do this
85   for all registers (including the floating point registers).  */
86
87static void
88alphabsd_fetch_inferior_registers (int regno)
89{
90  if (regno == -1 || getregs_supplies (regno))
91    {
92      struct reg gregs;
93
94      if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),
95		  (PTRACE_TYPE_ARG3) &gregs, 0) == -1)
96	perror_with_name (_("Couldn't get registers"));
97
98      alphabsd_supply_reg ((char *) &gregs, regno);
99      if (regno != -1)
100	return;
101    }
102
103  if (regno == -1 || regno >= FP0_REGNUM)
104    {
105      struct fpreg fpregs;
106
107      if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),
108		  (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
109	perror_with_name (_("Couldn't get floating point status"));
110
111      alphabsd_supply_fpreg ((char *) &fpregs, regno);
112    }
113}
114
115/* Store register REGNO back into the inferior.  If REGNO is -1, do
116   this for all registers (including the floating point registers).  */
117
118static void
119alphabsd_store_inferior_registers (int regno)
120{
121  if (regno == -1 || getregs_supplies (regno))
122    {
123      struct reg gregs;
124      if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),
125                  (PTRACE_TYPE_ARG3) &gregs, 0) == -1)
126        perror_with_name (_("Couldn't get registers"));
127
128      alphabsd_fill_reg ((char *) &gregs, regno);
129
130      if (ptrace (PT_SETREGS, PIDGET (inferior_ptid),
131                  (PTRACE_TYPE_ARG3) &gregs, 0) == -1)
132        perror_with_name (_("Couldn't write registers"));
133
134      if (regno != -1)
135	return;
136    }
137
138  if (regno == -1 || regno >= FP0_REGNUM)
139    {
140      struct fpreg fpregs;
141
142      if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),
143		  (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
144	perror_with_name (_("Couldn't get floating point status"));
145
146      alphabsd_fill_fpreg ((char *) &fpregs, regno);
147
148      if (ptrace (PT_SETFPREGS, PIDGET (inferior_ptid),
149		  (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
150	perror_with_name (_("Couldn't write floating point status"));
151    }
152}
153
154
155/* Support for debugging kernel virtual memory images.  */
156
157#include <sys/types.h>
158#include <machine/pcb.h>
159
160#include "bsd-kvm.h"
161
162static int
163alphabsd_supply_pcb (struct regcache *regcache, struct pcb *pcb)
164{
165  int regnum;
166
167  /* The following is true for OpenBSD 3.9:
168
169     The pcb contains the register state at the context switch inside
170     cpu_switch().  */
171
172  /* The stack pointer shouldn't be zero.  */
173  if (pcb->pcb_hw.apcb_ksp == 0)
174    return 0;
175
176  regcache_raw_supply (regcache, ALPHA_SP_REGNUM, &pcb->pcb_hw.apcb_ksp);
177
178  for (regnum = 9; regnum < 16; regnum ++)	/* s0-s6 */
179    regcache_raw_supply (regcache, regnum, &pcb->pcb_context[regnum - 9]);
180  regcache_raw_supply (regcache, ALPHA_RA_REGNUM, &pcb->pcb_context[7]);
181
182  return 1;
183}
184
185
186/* Provide a prototype to silence -Wmissing-prototypes.  */
187void _initialize_alphabsd_nat (void);
188
189void
190_initialize_alphabsd_nat (void)
191{
192  struct target_ops *t;
193
194  t = inf_ptrace_target ();
195  t->to_fetch_registers = alphabsd_fetch_inferior_registers;
196  t->to_store_registers = alphabsd_store_inferior_registers;
197  add_target (t);
198
199  /* Support debugging kernel virtual memory images.  */
200  bsd_kvm_add_target (alphabsd_supply_pcb);
201}
202