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
|
/* Ravenscar SPARC target support.
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 "gdbcore.h"
#include "regcache.h"
#include "sparc-tdep.h"
#include "inferior.h"
#include "ravenscar-thread.h"
#include "sparc-ravenscar-thread.h"
#include "gdbarch.h"
struct sparc_ravenscar_ops : public ravenscar_arch_ops
{
void fetch_registers (struct regcache *, int) override;
void store_registers (struct regcache *, int) override;
};
/* Register offsets from a referenced address (exempli gratia the
Thread_Descriptor). The referenced address depends on the register
number. The Thread_Descriptor layout and the stack layout are documented
in the GNAT sources, in sparc-bb.h. */
static const int sparc_register_offsets[] =
{
/* G0 - G7 */
-1, 0x24, 0x28, 0x2C, 0x30, 0x34, 0x38, 0x3C,
/* O0 - O7 */
0x00, 0x04, 0x08, 0x0C, 0x10, 0x14, 0x18, 0x1C,
/* L0 - L7 */
0x00, 0x04, 0x08, 0x0C, 0x10, 0x14, 0x18, 0x1C,
/* I0 - I7 */
0x20, 0x24, 0x28, 0x2C, 0x30, 0x34, 0x38, 0x3C,
/* F0 - F31 */
0x50, 0x54, 0x58, 0x5C, 0x60, 0x64, 0x68, 0x6C,
0x70, 0x74, 0x78, 0x7C, 0x80, 0x84, 0x88, 0x8C,
0x90, 0x94, 0x99, 0x9C, 0xA0, 0xA4, 0xA8, 0xAC,
0xB0, 0xB4, 0xBB, 0xBC, 0xC0, 0xC4, 0xC8, 0xCC,
/* Y PSR WIM TBR PC NPC FPSR CPSR */
0x40, 0x20, 0x44, -1, 0x1C, -1, 0x4C, -1
};
/* supply register REGNUM, which has been saved on 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);
}
/* Return true if, for a non-running thread, REGNUM has been saved on the
stack. */
static int
register_on_stack_p (int regnum)
{
return (regnum >= SPARC_L0_REGNUM && regnum <= SPARC_L7_REGNUM)
|| (regnum >= SPARC_I0_REGNUM && regnum <= SPARC_I7_REGNUM);
}
/* Return true if, for a non-running thread, REGNUM has been saved on the
Thread_Descriptor. */
static int
register_in_thread_descriptor_p (int regnum)
{
return (regnum >= SPARC_O0_REGNUM && regnum <= SPARC_O7_REGNUM)
|| (regnum == SPARC32_PSR_REGNUM)
|| (regnum >= SPARC_G1_REGNUM && regnum <= SPARC_G7_REGNUM)
|| (regnum == SPARC32_Y_REGNUM)
|| (regnum == SPARC32_WIM_REGNUM)
|| (regnum == SPARC32_FSR_REGNUM)
|| (regnum >= SPARC_F0_REGNUM && regnum <= SPARC_F0_REGNUM + 31)
|| (regnum == SPARC32_PC_REGNUM);
}
/* to_fetch_registers when inferior_ptid is different from the running
thread. */
void
sparc_ravenscar_ops::fetch_registers (struct regcache *regcache, int regnum)
{
struct gdbarch *gdbarch = regcache->arch ();
const int sp_regnum = gdbarch_sp_regnum (gdbarch);
const int num_regs = gdbarch_num_regs (gdbarch);
int current_regnum;
CORE_ADDR current_address;
CORE_ADDR thread_descriptor_address;
ULONGEST stack_address;
/* The tid is the thread_id field, which is a pointer to the thread. */
thread_descriptor_address = (CORE_ADDR) inferior_ptid.tid ();
/* Read the saved SP in the context buffer. */
current_address = thread_descriptor_address
+ sparc_register_offsets [sp_regnum];
supply_register_at_address (regcache, sp_regnum, current_address);
regcache_cooked_read_unsigned (regcache, sp_regnum, &stack_address);
/* Read registers. */
for (current_regnum = 0; current_regnum < num_regs; current_regnum ++)
{
if (register_in_thread_descriptor_p (current_regnum))
{
current_address = thread_descriptor_address
+ sparc_register_offsets [current_regnum];
supply_register_at_address (regcache, current_regnum,
current_address);
}
else if (register_on_stack_p (current_regnum))
{
current_address = stack_address
+ sparc_register_offsets [current_regnum];
supply_register_at_address (regcache, current_regnum,
current_address);
}
}
}
/* to_store_registers when inferior_ptid is different from the running
thread. */
void
sparc_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];
ULONGEST register_address;
if (register_in_thread_descriptor_p (regnum))
register_address =
inferior_ptid.tid () + sparc_register_offsets [regnum];
else if (register_on_stack_p (regnum))
{
regcache_cooked_read_unsigned (regcache, SPARC_SP_REGNUM,
®ister_address);
register_address += sparc_register_offsets [regnum];
}
else
return;
regcache->raw_collect (regnum, buf);
write_memory (register_address,
buf,
buf_size);
}
static struct sparc_ravenscar_ops sparc_ravenscar_ops;
/* Register ravenscar_arch_ops in GDBARCH. */
void
register_sparc_ravenscar_ops (struct gdbarch *gdbarch)
{
set_gdbarch_ravenscar_ops (gdbarch, &sparc_ravenscar_ops);
}
|
