aboutsummaryrefslogtreecommitdiff
path: root/gdb/alpha-bsd-nat.c
blob: 11e1639173a33488fd97e911650783dd5524453a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
/* Native-dependent code for Alpha BSD's.

   Copyright (C) 2000-2024 Free Software Foundation, Inc.

   This file is part of GDB.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

/* We define this to get types like register_t.  */
#define _KERNTYPES
#include "inferior.h"
#include "regcache.h"

#include "alpha-tdep.h"
#include "alpha-bsd-tdep.h"
#include "inf-ptrace.h"
#include "netbsd-nat.h"

#include <sys/types.h>
#include <sys/ptrace.h>
#include <machine/reg.h>

struct alpha_bsd_nat_target final : public nbsd_nat_target
{
  void fetch_registers (struct regcache *, int) override;
  void store_registers (struct regcache *, int) override;
};

static alpha_bsd_nat_target the_alpha_bsd_nat_target;

/* Determine if PT_GETREGS fetches this register.  */

static int
getregs_supplies (int regno)
{
  return ((regno >= ALPHA_V0_REGNUM && regno <= ALPHA_ZERO_REGNUM)
	  || regno >= ALPHA_PC_REGNUM);
}

/* Fetch register REGNO from the inferior.  If REGNO is -1, do this
   for all registers (including the floating point registers).  */

void
alpha_bsd_nat_target::fetch_registers (struct regcache *regcache, int regno)
{
  int lwp = regcache->ptid ().lwp ();

  if (regno == -1 || getregs_supplies (regno))
    {
      struct reg gregs;

      if (ptrace (PT_GETREGS, regcache->ptid ().pid (),
		  (PTRACE_TYPE_ARG3) &gregs, lwp) == -1)
	perror_with_name (_("Couldn't get registers"));

      alphabsd_supply_reg (regcache, (char *) &gregs, regno);
      if (regno != -1)
	return;
    }

  if (regno == -1
      || regno >= gdbarch_fp0_regnum (regcache->arch ()))
    {
      struct fpreg fpregs;

      if (ptrace (PT_GETFPREGS, regcache->ptid ().pid (),
		  (PTRACE_TYPE_ARG3) &fpregs, lwp) == -1)
	perror_with_name (_("Couldn't get floating point status"));

      alphabsd_supply_fpreg (regcache, (char *) &fpregs, regno);
    }
}

/* Store register REGNO back into the inferior.  If REGNO is -1, do
   this for all registers (including the floating point registers).  */

void
alpha_bsd_nat_target::store_registers (struct regcache *regcache, int regno)
{
  int lwp = regcache->ptid ().lwp ();

  if (regno == -1 || getregs_supplies (regno))
    {
      struct reg gregs;
      if (ptrace (PT_GETREGS, regcache->ptid ().pid (),
		  (PTRACE_TYPE_ARG3) &gregs, lwp) == -1)
	perror_with_name (_("Couldn't get registers"));

      alphabsd_fill_reg (regcache, (char *) &gregs, regno);

      if (ptrace (PT_SETREGS, regcache->ptid ().pid (),
		  (PTRACE_TYPE_ARG3) &gregs, lwp) == -1)
	perror_with_name (_("Couldn't write registers"));

      if (regno != -1)
	return;
    }

  if (regno == -1
      || regno >= gdbarch_fp0_regnum (regcache->arch ()))
    {
      struct fpreg fpregs;

      if (ptrace (PT_GETFPREGS, regcache->ptid ().pid (),
		  (PTRACE_TYPE_ARG3) &fpregs, lwp) == -1)
	perror_with_name (_("Couldn't get floating point status"));

      alphabsd_fill_fpreg (regcache, (char *) &fpregs, regno);

      if (ptrace (PT_SETFPREGS, regcache->ptid ().pid (),
		  (PTRACE_TYPE_ARG3) &fpregs, lwp) == -1)
	perror_with_name (_("Couldn't write floating point status"));
    }
}


/* Support for debugging kernel virtual memory images.  */

#include <sys/signal.h>
#include <machine/pcb.h>

#include "bsd-kvm.h"

static int
alphabsd_supply_pcb (struct regcache *regcache, struct pcb *pcb)
{
  int regnum;

  /* The following is true for OpenBSD 3.9:

     The pcb contains the register state at the context switch inside
     cpu_switch().  */

  /* The stack pointer shouldn't be zero.  */
  if (pcb->pcb_hw.apcb_ksp == 0)
    return 0;

  regcache->raw_supply (ALPHA_SP_REGNUM, &pcb->pcb_hw.apcb_ksp);

  for (regnum = ALPHA_S0_REGNUM; regnum < ALPHA_A0_REGNUM; regnum++)
    regcache->raw_supply (regnum, &pcb->pcb_context[regnum - ALPHA_S0_REGNUM]);
  regcache->raw_supply (ALPHA_RA_REGNUM, &pcb->pcb_context[7]);

  return 1;
}


void _initialize_alphabsd_nat ();
void
_initialize_alphabsd_nat ()
{
  add_inf_child_target (&the_alpha_bsd_nat_target);

  /* Support debugging kernel virtual memory images.  */
  bsd_kvm_add_target (alphabsd_supply_pcb);
}