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
|
/* Ravenscar x86-64 target support.
Copyright (C) 2020-2022 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 "gdbarch.h"
#include "gdbcore.h"
#include "regcache.h"
#include "amd64-tdep.h"
#include "inferior.h"
#include "ravenscar-thread.h"
#include "amd64-ravenscar-thread.h"
struct amd64_ravenscar_ops : public ravenscar_arch_ops
{
void fetch_registers (struct regcache *regcache, int regnum) override;
void store_registers (struct regcache *regcache, int regnum) override;
private:
/* Return the offset of the register in the context buffer. */
int register_offset (struct gdbarch *arch, int regnum);
};
/* x86-64 Ravenscar stores registers as:
type Context_Buffer is record
RIP : System.Address;
RFLAGS : EFLAGS;
RSP : System.Address;
RBX : System.Address;
RBP : System.Address;
R12 : System.Address;
R13 : System.Address;
R14 : System.Address;
R15 : System.Address;
end record;
*/
static const int register_layout[] =
{
AMD64_RIP_REGNUM,
AMD64_EFLAGS_REGNUM,
AMD64_RSP_REGNUM,
AMD64_RBX_REGNUM,
AMD64_RBP_REGNUM,
AMD64_R12_REGNUM,
AMD64_R13_REGNUM,
AMD64_R14_REGNUM,
AMD64_R15_REGNUM,
};
int
amd64_ravenscar_ops::register_offset (struct gdbarch *arch, int regnum)
{
for (int i = 0; i < ARRAY_SIZE (register_layout); ++i)
if (register_layout[i] == regnum)
return i * 8;
/* Not saved. */
return -1;
}
/* Supply register REGNUM, which has been saved at REGISTER_ADDR, to
the regcache. */
static void
supply_register_at_address (struct regcache *regcache, int regnum,
CORE_ADDR register_addr)
{
struct gdbarch *gdbarch = regcache->arch ();
int buf_size = register_size (gdbarch, regnum);
gdb_byte *buf;
buf = (gdb_byte *) alloca (buf_size);
read_memory (register_addr, buf, buf_size);
regcache->raw_supply (regnum, buf);
}
void
amd64_ravenscar_ops::fetch_registers (struct regcache *regcache, int regnum)
{
struct gdbarch *gdbarch = regcache->arch ();
const int num_regs = gdbarch_num_regs (gdbarch);
int current_regnum;
CORE_ADDR current_address;
CORE_ADDR thread_descriptor_address;
/* The tid is the thread_id field, which is a pointer to the thread. */
thread_descriptor_address = (CORE_ADDR) inferior_ptid.tid ();
/* Read registers. */
for (current_regnum = 0; current_regnum < num_regs; current_regnum++)
{
int offset = register_offset (gdbarch, current_regnum);
if (offset != -1)
{
current_address = thread_descriptor_address + offset;
supply_register_at_address (regcache, current_regnum,
current_address);
}
}
}
void
amd64_ravenscar_ops::store_registers (struct regcache *regcache, int regnum)
{
struct gdbarch *gdbarch = regcache->arch ();
int buf_size = register_size (gdbarch, regnum);
gdb_byte buf[buf_size];
CORE_ADDR register_address;
int offset = register_offset (gdbarch, regnum);
if (offset != -1)
{
register_address = inferior_ptid.tid () + offset;
regcache->raw_collect (regnum, buf);
write_memory (register_address,
buf,
buf_size);
}
}
/* The ravenscar_arch_ops vector for AMD64 targets. */
static struct amd64_ravenscar_ops amd64_ravenscar_ops;
/* Register amd64_ravenscar_ops in GDBARCH. */
void
register_amd64_ravenscar_ops (struct gdbarch *gdbarch)
{
set_gdbarch_ravenscar_ops (gdbarch, &amd64_ravenscar_ops);
}
|
