aboutsummaryrefslogtreecommitdiff
path: root/gdb/aarch64-fbsd-nat.c
blob: 4f4eb8990e50616763c5c3cd4a9abb7533870c52 (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
/* Native-dependent code for FreeBSD/aarch64.

   Copyright (C) 2017-2018 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/>.  */

#include "defs.h"
#include "target.h"

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

#include "fbsd-nat.h"
#include "aarch64-tdep.h"
#include "aarch64-fbsd-tdep.h"
#include "inf-ptrace.h"

/* Determine if PT_GETREGS fetches REGNUM.  */

static bool
getregs_supplies (struct gdbarch *gdbarch, int regnum)
{
  return (regnum >= AARCH64_X0_REGNUM && regnum <= AARCH64_CPSR_REGNUM);
}

/* Determine if PT_GETFPREGS fetches REGNUM.  */

static bool
getfpregs_supplies (struct gdbarch *gdbarch, int regnum)
{
  return (regnum >= AARCH64_V0_REGNUM && regnum <= AARCH64_FPCR_REGNUM);
}

/* Fetch register REGNUM from the inferior.  If REGNUM is -1, do this
   for all registers.  */

static void
aarch64_fbsd_fetch_inferior_registers (struct target_ops *ops,
				    struct regcache *regcache, int regnum)
{
  pid_t pid = get_ptrace_pid (regcache_get_ptid (regcache));

  struct gdbarch *gdbarch = regcache->arch ();
  if (regnum == -1 || getregs_supplies (gdbarch, regnum))
    {
      struct reg regs;

      if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
	perror_with_name (_("Couldn't get registers"));

      regcache->supply_regset (&aarch64_fbsd_gregset, regnum, &regs,
			       sizeof (regs));
    }

  if (regnum == -1 || getfpregs_supplies (gdbarch, regnum))
    {
      struct fpreg fpregs;

      if (ptrace (PT_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
	perror_with_name (_("Couldn't get floating point status"));

      regcache->supply_regset (&aarch64_fbsd_fpregset, regnum, &fpregs,
			       sizeof (fpregs));
    }
}

/* Store register REGNUM back into the inferior.  If REGNUM is -1, do
   this for all registers.  */

static void
aarch64_fbsd_store_inferior_registers (struct target_ops *ops,
				    struct regcache *regcache, int regnum)
{
  pid_t pid = get_ptrace_pid (regcache_get_ptid (regcache));

  struct gdbarch *gdbarch = regcache->arch ();
  if (regnum == -1 || getregs_supplies (gdbarch, regnum))
    {
      struct reg regs;

      if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
	perror_with_name (_("Couldn't get registers"));

      regcache->collect_regset (&aarch64_fbsd_gregset, regnum, &regs,
			       sizeof (regs));

      if (ptrace (PT_SETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
	perror_with_name (_("Couldn't write registers"));
    }

  if (regnum == -1 || getfpregs_supplies (gdbarch, regnum))
    {
      struct fpreg fpregs;

      if (ptrace (PT_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
	perror_with_name (_("Couldn't get floating point status"));

      regcache->collect_regset (&aarch64_fbsd_fpregset, regnum, &fpregs,
				sizeof (fpregs));

      if (ptrace (PT_SETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
	perror_with_name (_("Couldn't write floating point status"));
    }
}

void
_initialize_aarch64_fbsd_nat (void)
{
  struct target_ops *t;

  t = inf_ptrace_target ();
  t->to_fetch_registers = aarch64_fbsd_fetch_inferior_registers;
  t->to_store_registers = aarch64_fbsd_store_inferior_registers;
  fbsd_nat_add_target (t);
}