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
|
/* Target-dependent code for OpenBSD/mips64.
Copyright (C) 2004-2020 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 "gdbtypes.h"
#include "osabi.h"
#include "regcache.h"
#include "regset.h"
#include "trad-frame.h"
#include "tramp-frame.h"
#include "obsd-tdep.h"
#include "mips-tdep.h"
#include "solib-svr4.h"
/* The MIPS64 Floating-Point Quad-Precision format is similar to
big-endian IA-64 Quad-Precision format. */
#define floatformats_mips64_quad floatformats_ia64_quad
#define MIPS64OBSD_NUM_REGS 73
/* Core file support. */
/* Supply register REGNUM from the buffer specified by GREGS and LEN
in the general-purpose register set REGSET to register cache
REGCACHE. If REGNUM is -1, do this for all registers in REGSET. */
static void
mips64obsd_supply_gregset (const struct regset *regset,
struct regcache *regcache, int regnum,
const void *gregs, size_t len)
{
const char *regs = (const char *) gregs;
int i;
for (i = 0; i < MIPS64OBSD_NUM_REGS; i++)
{
if (regnum == i || regnum == -1)
regcache->raw_supply (i, regs + i * 8);
}
}
/* OpenBSD/mips64 register set. */
static const struct regset mips64obsd_gregset =
{
NULL,
mips64obsd_supply_gregset
};
/* Iterate over core file register note sections. */
static void
mips64obsd_iterate_over_regset_sections (struct gdbarch *gdbarch,
iterate_over_regset_sections_cb *cb,
void *cb_data,
const struct regcache *regcache)
{
cb (".reg", MIPS64OBSD_NUM_REGS * 8, MIPS64OBSD_NUM_REGS * 8,
&mips64obsd_gregset, NULL, cb_data);
}
/* Signal trampolines. */
static void
mips64obsd_sigframe_init (const struct tramp_frame *self,
struct frame_info *this_frame,
struct trad_frame_cache *cache,
CORE_ADDR func)
{
struct gdbarch *gdbarch = get_frame_arch (this_frame);
CORE_ADDR sp, sigcontext_addr, addr;
int regnum;
/* We find the appropriate instance of `struct sigcontext' at a
fixed offset in the signal frame. */
sp = get_frame_register_signed (this_frame,
MIPS_SP_REGNUM + gdbarch_num_regs (gdbarch));
sigcontext_addr = sp + 32;
/* PC. */
regnum = mips_regnum (gdbarch)->pc;
trad_frame_set_reg_addr (cache,
regnum + gdbarch_num_regs (gdbarch),
sigcontext_addr + 16);
/* GPRs. */
for (regnum = MIPS_AT_REGNUM, addr = sigcontext_addr + 32;
regnum <= MIPS_RA_REGNUM; regnum++, addr += 8)
trad_frame_set_reg_addr (cache,
regnum + gdbarch_num_regs (gdbarch),
addr);
/* HI and LO. */
regnum = mips_regnum (gdbarch)->lo;
trad_frame_set_reg_addr (cache,
regnum + gdbarch_num_regs (gdbarch),
sigcontext_addr + 280);
regnum = mips_regnum (gdbarch)->hi;
trad_frame_set_reg_addr (cache,
regnum + gdbarch_num_regs (gdbarch),
sigcontext_addr + 288);
/* TODO: Handle the floating-point registers. */
trad_frame_set_id (cache, frame_id_build (sp, func));
}
static const struct tramp_frame mips64obsd_sigframe =
{
SIGTRAMP_FRAME,
MIPS_INSN32_SIZE,
{
{ 0x67a40020, ULONGEST_MAX }, /* daddiu a0,sp,32 */
{ 0x24020067, ULONGEST_MAX }, /* li v0,103 */
{ 0x0000000c, ULONGEST_MAX }, /* syscall */
{ 0x0000000d, ULONGEST_MAX }, /* break */
{ TRAMP_SENTINEL_INSN, ULONGEST_MAX }
},
mips64obsd_sigframe_init
};
static void
mips64obsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
{
/* OpenBSD/mips64 only supports the n64 ABI, but the braindamaged
way GDB works, forces us to pretend we can handle them all. */
set_gdbarch_iterate_over_regset_sections
(gdbarch, mips64obsd_iterate_over_regset_sections);
tramp_frame_prepend_unwinder (gdbarch, &mips64obsd_sigframe);
set_gdbarch_long_double_bit (gdbarch, 128);
set_gdbarch_long_double_format (gdbarch, floatformats_mips64_quad);
obsd_init_abi(info, gdbarch);
/* OpenBSD/mips64 has SVR4-style shared libraries. */
set_solib_svr4_fetch_link_map_offsets
(gdbarch, svr4_lp64_fetch_link_map_offsets);
}
void
_initialize_mips64obsd_tdep (void)
{
gdbarch_register_osabi (bfd_arch_mips, 0, GDB_OSABI_OPENBSD,
mips64obsd_init_abi);
}
|
