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
|
/* Traditional frame unwind support, for GDB the GNU Debugger.
Copyright (C) 2003, 2004, 2007, 2008 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 "frame.h"
#include "trad-frame.h"
#include "regcache.h"
struct trad_frame_cache
{
struct frame_info *next_frame;
CORE_ADDR this_base;
struct trad_frame_saved_reg *prev_regs;
struct frame_id this_id;
};
struct trad_frame_cache *
trad_frame_cache_zalloc (struct frame_info *next_frame)
{
struct trad_frame_cache *this_trad_cache;
this_trad_cache = FRAME_OBSTACK_ZALLOC (struct trad_frame_cache);
this_trad_cache->prev_regs = trad_frame_alloc_saved_regs (next_frame);
this_trad_cache->next_frame = next_frame;
return this_trad_cache;
}
/* A traditional frame is unwound by analysing the function prologue
and using the information gathered to track registers. For
non-optimized frames, the technique is reliable (just need to check
for all potential instruction sequences). */
struct trad_frame_saved_reg *
trad_frame_alloc_saved_regs (struct frame_info *next_frame)
{
int regnum;
struct gdbarch *gdbarch = get_frame_arch (next_frame);
int numregs = gdbarch_num_regs (gdbarch) + gdbarch_num_pseudo_regs (gdbarch);
struct trad_frame_saved_reg *this_saved_regs
= FRAME_OBSTACK_CALLOC (numregs, struct trad_frame_saved_reg);
for (regnum = 0; regnum < numregs; regnum++)
{
this_saved_regs[regnum].realreg = regnum;
this_saved_regs[regnum].addr = -1;
}
return this_saved_regs;
}
enum { REG_VALUE = -1, REG_UNKNOWN = -2 };
int
trad_frame_value_p (struct trad_frame_saved_reg this_saved_regs[], int regnum)
{
return (this_saved_regs[regnum].realreg == REG_VALUE);
}
int
trad_frame_addr_p (struct trad_frame_saved_reg this_saved_regs[], int regnum)
{
return (this_saved_regs[regnum].realreg >= 0
&& this_saved_regs[regnum].addr != -1);
}
int
trad_frame_realreg_p (struct trad_frame_saved_reg this_saved_regs[],
int regnum)
{
return (this_saved_regs[regnum].realreg >= 0
&& this_saved_regs[regnum].addr == -1);
}
void
trad_frame_set_value (struct trad_frame_saved_reg this_saved_regs[],
int regnum, LONGEST val)
{
/* Make the REALREG invalid, indicating that the ADDR contains the
register's value. */
this_saved_regs[regnum].realreg = REG_VALUE;
this_saved_regs[regnum].addr = val;
}
void
trad_frame_set_reg_value (struct trad_frame_cache *this_trad_cache,
int regnum, LONGEST val)
{
/* External interface for users of trad_frame_cache
(who cannot access the prev_regs object directly). */
trad_frame_set_value (this_trad_cache->prev_regs, regnum, val);
}
void
trad_frame_set_reg_realreg (struct trad_frame_cache *this_trad_cache,
int regnum, int realreg)
{
this_trad_cache->prev_regs[regnum].realreg = realreg;
this_trad_cache->prev_regs[regnum].addr = -1;
}
void
trad_frame_set_reg_addr (struct trad_frame_cache *this_trad_cache,
int regnum, CORE_ADDR addr)
{
this_trad_cache->prev_regs[regnum].addr = addr;
}
void
trad_frame_set_unknown (struct trad_frame_saved_reg this_saved_regs[],
int regnum)
{
/* Make the REALREG invalid, indicating that the value is not known. */
this_saved_regs[regnum].realreg = REG_UNKNOWN;
this_saved_regs[regnum].addr = -1;
}
void
trad_frame_get_prev_register (struct frame_info *next_frame,
struct trad_frame_saved_reg this_saved_regs[],
int regnum, int *optimizedp,
enum lval_type *lvalp, CORE_ADDR *addrp,
int *realregp, gdb_byte *bufferp)
{
struct gdbarch *gdbarch = get_frame_arch (next_frame);
if (trad_frame_addr_p (this_saved_regs, regnum))
{
/* The register was saved in memory. */
*optimizedp = 0;
*lvalp = lval_memory;
*addrp = this_saved_regs[regnum].addr;
*realregp = -1;
if (bufferp != NULL)
{
/* Read the value in from memory. */
get_frame_memory (next_frame, this_saved_regs[regnum].addr, bufferp,
register_size (gdbarch, regnum));
}
}
else if (trad_frame_realreg_p (this_saved_regs, regnum))
{
*optimizedp = 0;
*lvalp = lval_register;
*addrp = 0;
*realregp = this_saved_regs[regnum].realreg;
/* Ask the next frame to return the value of the register. */
if (bufferp)
frame_unwind_register (next_frame, (*realregp), bufferp);
}
else if (trad_frame_value_p (this_saved_regs, regnum))
{
/* The register's value is available. */
*optimizedp = 0;
*lvalp = not_lval;
*addrp = 0;
*realregp = -1;
if (bufferp != NULL)
store_unsigned_integer (bufferp, register_size (gdbarch, regnum),
this_saved_regs[regnum].addr);
}
else
{
error (_("Register %s not available"),
gdbarch_register_name (gdbarch, regnum));
}
}
void
trad_frame_get_register (struct trad_frame_cache *this_trad_cache,
struct frame_info *next_frame,
int regnum, int *optimizedp,
enum lval_type *lvalp, CORE_ADDR *addrp,
int *realregp, gdb_byte *bufferp)
{
trad_frame_get_prev_register (next_frame, this_trad_cache->prev_regs,
regnum, optimizedp, lvalp, addrp, realregp,
bufferp);
}
void
trad_frame_set_id (struct trad_frame_cache *this_trad_cache,
struct frame_id this_id)
{
this_trad_cache->this_id = this_id;
}
void
trad_frame_get_id (struct trad_frame_cache *this_trad_cache,
struct frame_id *this_id)
{
(*this_id) = this_trad_cache->this_id;
}
void
trad_frame_set_this_base (struct trad_frame_cache *this_trad_cache,
CORE_ADDR this_base)
{
this_trad_cache->this_base = this_base;
}
CORE_ADDR
trad_frame_get_this_base (struct trad_frame_cache *this_trad_cache)
{
return this_trad_cache->this_base;
}
|
