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
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
|
/* Target-dependent code for GNU/Linux Super-H.
Copyright (C) 2005-2018 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 "osabi.h"
#include "solib-svr4.h"
#include "symtab.h"
#include "trad-frame.h"
#include "tramp-frame.h"
#include "glibc-tdep.h"
#include "sh-tdep.h"
#include "linux-tdep.h"
#define REGSx16(base) \
{(base), 0}, \
{(base) + 1, 4}, \
{(base) + 2, 8}, \
{(base) + 3, 12}, \
{(base) + 4, 16}, \
{(base) + 5, 20}, \
{(base) + 6, 24}, \
{(base) + 7, 28}, \
{(base) + 8, 32}, \
{(base) + 9, 36}, \
{(base) + 10, 40}, \
{(base) + 11, 44}, \
{(base) + 12, 48}, \
{(base) + 13, 52}, \
{(base) + 14, 56}, \
{(base) + 15, 60}
/* Describe the contents of the .reg section of the core file. */
static const struct sh_corefile_regmap gregs_table[] =
{
REGSx16 (R0_REGNUM),
{PC_REGNUM, 64},
{PR_REGNUM, 68},
{SR_REGNUM, 72},
{GBR_REGNUM, 76},
{MACH_REGNUM, 80},
{MACL_REGNUM, 84},
{-1 /* Terminator. */, 0}
};
/* Describe the contents of the .reg2 section of the core file. */
static const struct sh_corefile_regmap fpregs_table[] =
{
REGSx16 (FR0_REGNUM),
/* REGSx16 xfp_regs omitted. */
{FPSCR_REGNUM, 128},
{FPUL_REGNUM, 132},
{-1 /* Terminator. */, 0}
};
/* SH signal handler frame support. */
static void
sh_linux_sigtramp_cache (struct frame_info *this_frame,
struct trad_frame_cache *this_cache,
CORE_ADDR func, int regs_offset)
{
int i;
struct gdbarch *gdbarch = get_frame_arch (this_frame);
CORE_ADDR base = get_frame_register_unsigned (this_frame,
gdbarch_sp_regnum (gdbarch));
CORE_ADDR regs = base + regs_offset;
for (i = 0; i < 18; i++)
trad_frame_set_reg_addr (this_cache, i, regs + i * 4);
trad_frame_set_reg_addr (this_cache, SR_REGNUM, regs + 18 * 4);
trad_frame_set_reg_addr (this_cache, GBR_REGNUM, regs + 19 * 4);
trad_frame_set_reg_addr (this_cache, MACH_REGNUM, regs + 20 * 4);
trad_frame_set_reg_addr (this_cache, MACL_REGNUM, regs + 21 * 4);
/* Restore FP state if we have an FPU. */
if (gdbarch_fp0_regnum (gdbarch) != -1)
{
CORE_ADDR fpregs = regs + 22 * 4;
for (i = FR0_REGNUM; i <= FP_LAST_REGNUM; i++)
trad_frame_set_reg_addr (this_cache, i, fpregs + i * 4);
trad_frame_set_reg_addr (this_cache, FPSCR_REGNUM, fpregs + 32 * 4);
trad_frame_set_reg_addr (this_cache, FPUL_REGNUM, fpregs + 33 * 4);
}
/* Save a frame ID. */
trad_frame_set_id (this_cache, frame_id_build (base, func));
}
/* Implement struct tramp_frame "init" callbacks for signal
trampolines on 32-bit SH. */
static void
sh_linux_sigreturn_init (const struct tramp_frame *self,
struct frame_info *this_frame,
struct trad_frame_cache *this_cache,
CORE_ADDR func)
{
/* SH 32-bit sigframe: sigcontext at start of sigframe,
registers start after a single 'oldmask' word. */
sh_linux_sigtramp_cache (this_frame, this_cache, func, 4);
}
static void
sh_linux_rt_sigreturn_init (const struct tramp_frame *self,
struct frame_info *this_frame,
struct trad_frame_cache *this_cache,
CORE_ADDR func)
{
/* SH 32-bit rt_sigframe: starts with a siginfo (128 bytes), then
we can find sigcontext embedded within a ucontext (offset 20 bytes).
Then registers start after a single 'oldmask' word. */
sh_linux_sigtramp_cache (this_frame, this_cache, func,
128 /* sizeof (struct siginfo) */
+ 20 /* offsetof (struct ucontext, uc_mcontext) */
+ 4 /* oldmask word at start of sigcontext */);
}
/* Instruction patterns. */
#define SH_MOVW 0x9305
#define SH_TRAP 0xc300
#define SH_OR_R0_R0 0x200b
/* SH sigreturn syscall numbers. */
#define SH_NR_SIGRETURN 0x0077
#define SH_NR_RT_SIGRETURN 0x00ad
static struct tramp_frame sh_linux_sigreturn_tramp_frame = {
SIGTRAMP_FRAME,
2,
{
{ SH_MOVW, 0xffff },
{ SH_TRAP, 0xff00 }, /* #imm argument part filtered out. */
{ SH_OR_R0_R0, 0xffff },
{ SH_OR_R0_R0, 0xffff },
{ SH_OR_R0_R0, 0xffff },
{ SH_OR_R0_R0, 0xffff },
{ SH_OR_R0_R0, 0xffff },
{ SH_NR_SIGRETURN, 0xffff },
{ TRAMP_SENTINEL_INSN }
},
sh_linux_sigreturn_init
};
static struct tramp_frame sh_linux_rt_sigreturn_tramp_frame = {
SIGTRAMP_FRAME,
2,
{
{ SH_MOVW, 0xffff },
{ SH_TRAP, 0xff00 }, /* #imm argument part filtered out. */
{ SH_OR_R0_R0, 0xffff },
{ SH_OR_R0_R0, 0xffff },
{ SH_OR_R0_R0, 0xffff },
{ SH_OR_R0_R0, 0xffff },
{ SH_OR_R0_R0, 0xffff },
{ SH_NR_RT_SIGRETURN, 0xffff },
{ TRAMP_SENTINEL_INSN }
},
sh_linux_rt_sigreturn_init
};
static void
sh_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
{
linux_init_abi (info, gdbarch);
/* GNU/Linux uses SVR4-style shared libraries. */
set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target);
set_solib_svr4_fetch_link_map_offsets
(gdbarch, svr4_ilp32_fetch_link_map_offsets);
set_gdbarch_skip_solib_resolver (gdbarch, glibc_skip_solib_resolver);
set_gdbarch_fetch_tls_load_module_address (gdbarch,
svr4_fetch_objfile_link_map);
/* Core files and signal handler frame unwinding are supported for
32-bit SH only, at present. */
if (info.bfd_arch_info->mach != bfd_mach_sh5)
{
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
/* Remember regset characteristics. The sizes should match
elf_gregset_t and elf_fpregset_t from Linux. */
tdep->core_gregmap = (struct sh_corefile_regmap *)gregs_table;
tdep->sizeof_gregset = 92;
tdep->core_fpregmap = (struct sh_corefile_regmap *)fpregs_table;
tdep->sizeof_fpregset = 136;
tramp_frame_prepend_unwinder (gdbarch, &sh_linux_sigreturn_tramp_frame);
tramp_frame_prepend_unwinder (gdbarch, &sh_linux_rt_sigreturn_tramp_frame);
}
}
void
_initialize_sh_linux_tdep (void)
{
gdbarch_register_osabi (bfd_arch_sh, 0, GDB_OSABI_LINUX, sh_linux_init_abi);
}
|
