aboutsummaryrefslogtreecommitdiff
path: root/gdb/ppcnbsd-nat.c
blob: bbf13cc39a92d5b0cd4456afd2ce392f3dadbb3b (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
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
/* Native-dependent code for NetBSD/powerpc.

   Copyright (C) 2002, 2004, 2005, 2006, 2007 Free Software Foundation, Inc.

   Contributed by Wasabi Systems, 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 2 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, write to the Free Software
   Foundation, Inc., 51 Franklin Street, Fifth Floor,
   Boston, MA 02110-1301, USA.  */

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

#include "defs.h"
#include "gdbcore.h"
#include "inferior.h"
#include "regcache.h"

#include "gdb_assert.h"

#include "ppc-tdep.h"
#include "ppcnbsd-tdep.h"
#include "bsd-kvm.h"
#include "inf-ptrace.h"

/* Returns true if PT_GETREGS fetches this register.  */

static int
getregs_supplies (int regnum)
{
  struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);

  return ((regnum >= tdep->ppc_gp0_regnum
           && regnum < tdep->ppc_gp0_regnum + ppc_num_gprs)
          || regnum == tdep->ppc_lr_regnum
          || regnum == tdep->ppc_cr_regnum
          || regnum == tdep->ppc_xer_regnum
          || regnum == tdep->ppc_ctr_regnum
	  || regnum == gdbarch_pc_regnum (current_gdbarch));
}

/* Like above, but for PT_GETFPREGS.  */

static int
getfpregs_supplies (int regnum)
{
  struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);

  /* FIXME: jimb/2004-05-05: Some PPC variants don't have floating
     point registers.  Traditionally, GDB's register set has still
     listed the floating point registers for such machines, so this
     code is harmless.  However, the new E500 port actually omits the
     floating point registers entirely from the register set --- they
     don't even have register numbers assigned to them.

     It's not clear to me how best to update this code, so this assert
     will alert the first person to encounter the NetBSD/E500
     combination to the problem.  */
  gdb_assert (ppc_floating_point_unit_p (current_gdbarch));

  return ((regnum >= tdep->ppc_fp0_regnum
           && regnum < tdep->ppc_fp0_regnum + ppc_num_fprs)
	  || regnum == tdep->ppc_fpscr_regnum);
}

static void
ppcnbsd_fetch_inferior_registers (struct regcache *regcache, int regnum)
{
  if (regnum == -1 || getregs_supplies (regnum))
    {
      struct reg regs;

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

      ppc_supply_gregset (&ppcnbsd_gregset, regcache,
			  regnum, &regs, sizeof regs);
    }

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

      if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),
		  (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
	perror_with_name (_("Couldn't get FP registers"));

      ppc_supply_fpregset (&ppcnbsd_fpregset, regcache,
			   regnum, &fpregs, sizeof fpregs);
    }
}

static void
ppcnbsd_store_inferior_registers (struct regcache *regcache, int regnum)
{
  if (regnum == -1 || getregs_supplies (regnum))
    {
      struct reg regs;

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

      ppc_collect_gregset (&ppcnbsd_gregset, regcache,
			   regnum, &regs, sizeof regs);

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

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

      if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),
		  (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
	perror_with_name (_("Couldn't get FP registers"));

      ppc_collect_fpregset (&ppcnbsd_fpregset, regcache,
			    regnum, &fpregs, sizeof fpregs);

      if (ptrace (PT_SETFPREGS, PIDGET (inferior_ptid),
		  (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
	perror_with_name (_("Couldn't set FP registers"));
    }
}

static int
ppcnbsd_supply_pcb (struct regcache *regcache, struct pcb *pcb)
{
  struct switchframe sf;
  struct callframe cf;
  struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
  int i;

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

  read_memory (pcb->pcb_sp, (gdb_byte *)&sf, sizeof sf);
  regcache_raw_supply (regcache, tdep->ppc_cr_regnum, &sf.cr);
  regcache_raw_supply (regcache, tdep->ppc_gp0_regnum + 2, &sf.fixreg2);
  for (i = 0 ; i < 19 ; i++)
    regcache_raw_supply (regcache, tdep->ppc_gp0_regnum + 13 + i,
			 &sf.fixreg[i]);

  read_memory(sf.sp, (gdb_byte *)&cf, sizeof(cf));
  regcache_raw_supply (regcache, tdep->ppc_gp0_regnum + 30, &cf.r30);
  regcache_raw_supply (regcache, tdep->ppc_gp0_regnum + 31, &cf.r31);
  regcache_raw_supply (regcache, tdep->ppc_gp0_regnum + 1, &cf.sp);

  read_memory(cf.sp, (gdb_byte *)&cf, sizeof(cf));
  regcache_raw_supply (regcache, tdep->ppc_lr_regnum, &cf.lr);
  regcache_raw_supply (regcache, gdbarch_pc_regnum (current_gdbarch), &cf.lr);

  return 1;
}

/* Provide a prototype to silence -Wmissing-prototypes.  */
void _initialize_ppcnbsd_nat (void);

void
_initialize_ppcnbsd_nat (void)
{
  struct target_ops *t;

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

  /* Add in local overrides.  */
  t = inf_ptrace_target ();
  t->to_fetch_registers = ppcnbsd_fetch_inferior_registers;
  t->to_store_registers = ppcnbsd_store_inferior_registers;
  add_target (t);
}