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
|
/* Native-dependent code for OpenBSD/powerpc.
Copyright (C) 2004, 2005 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 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 "defs.h"
#include "gdbcore.h"
#include "inferior.h"
#include "regcache.h"
#include <stddef.h>
#include <sys/types.h>
#include <sys/ptrace.h>
#include <sys/signal.h>
#include <machine/frame.h>
#include <machine/pcb.h>
#include <machine/reg.h>
#include "ppc-tdep.h"
#include "ppcobsd-tdep.h"
#include "inf-ptrace.h"
#include "bsd-kvm.h"
/* OpenBSD/powerpc doesn't have PT_GETFPREGS/PT_SETFPREGS like
NetBSD/powerpc and FreeBSD/powerpc. */
/* Fetch register REGNUM from the inferior. If REGNUM is -1, do this
for all registers. */
static void
ppcobsd_fetch_registers (int regnum)
{
struct reg regs;
if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),
(PTRACE_TYPE_ARG3) ®s, 0) == -1)
perror_with_name (_("Couldn't get registers"));
ppcobsd_supply_gregset (&ppcobsd_gregset, current_regcache, -1,
®s, sizeof regs);
}
/* Store register REGNUM back into the inferior. If REGNUM is -1, do
this for all registers. */
static void
ppcobsd_store_registers (int regnum)
{
struct reg regs;
if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),
(PTRACE_TYPE_ARG3) ®s, 0) == -1)
perror_with_name (_("Couldn't get registers"));
ppcobsd_collect_gregset (&ppcobsd_gregset, current_regcache,
regnum, ®s, sizeof regs);
if (ptrace (PT_SETREGS, PIDGET (inferior_ptid),
(PTRACE_TYPE_ARG3) ®s, 0) == -1)
perror_with_name (_("Couldn't write registers"));
}
static int
ppcobsd_supply_pcb (struct regcache *regcache, struct pcb *pcb)
{
struct gdbarch_tdep *tdep = gdbarch_tdep (get_regcache_arch (regcache));
struct switchframe sf;
struct callframe cf;
int i, regnum;
/* The following is true for OpenBSD 3.7:
The pcb contains %r1 (the stack pointer) at the point of the
context switch in cpu_switch(). At that point we have a stack
frame as described by `struct switchframe', and below that a call
frame as described by `struct callframe'. From this information
we reconstruct the register state as it would look when we are in
cpu_switch(). */
/* 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, SP_REGNUM, &sf.sp);
regcache_raw_supply (regcache, tdep->ppc_cr_regnum, &sf.cr);
regcache_raw_supply (regcache, tdep->ppc_gp0_regnum + 2, &sf.fixreg2);
for (i = 0, regnum = tdep->ppc_gp0_regnum + 13; i < 19; i++, regnum++)
regcache_raw_supply (regcache, regnum, &sf.fixreg[i]);
read_memory (sf.sp, (gdb_byte *)&cf, sizeof cf);
regcache_raw_supply (regcache, PC_REGNUM, &cf.lr);
regcache_raw_supply (regcache, tdep->ppc_gp0_regnum + 30, &cf.r30);
regcache_raw_supply (regcache, tdep->ppc_gp0_regnum + 31, &cf.r31);
return 1;
}
/* Provide a prototype to silence -Wmissing-prototypes. */
void _initialize_ppcobsd_nat (void);
void
_initialize_ppcobsd_nat (void)
{
struct target_ops *t;
/* Add in local overrides. */
t = inf_ptrace_target ();
t->to_fetch_registers = ppcobsd_fetch_registers;
t->to_store_registers = ppcobsd_store_registers;
add_target (t);
/* General-purpose registers. */
ppcobsd_reg_offsets.r0_offset = offsetof (struct reg, gpr);
ppcobsd_reg_offsets.pc_offset = offsetof (struct reg, pc);
ppcobsd_reg_offsets.ps_offset = offsetof (struct reg, ps);
ppcobsd_reg_offsets.cr_offset = offsetof (struct reg, cnd);
ppcobsd_reg_offsets.lr_offset = offsetof (struct reg, lr);
ppcobsd_reg_offsets.ctr_offset = offsetof (struct reg, cnt);
ppcobsd_reg_offsets.xer_offset = offsetof (struct reg, xer);
ppcobsd_reg_offsets.mq_offset = offsetof (struct reg, mq);
/* Floating-point registers. */
ppcobsd_reg_offsets.f0_offset = offsetof (struct reg, fpr);
ppcobsd_reg_offsets.fpscr_offset = -1;
/* AltiVec registers. */
ppcobsd_reg_offsets.vr0_offset = offsetof (struct vreg, vreg);
ppcobsd_reg_offsets.vscr_offset = offsetof (struct vreg, vscr);
ppcobsd_reg_offsets.vrsave_offset = offsetof (struct vreg, vrsave);
/* Support debugging kernel virtual memory images. */
bsd_kvm_add_target (ppcobsd_supply_pcb);
}
|
