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
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
|
/* Target-dependent code for SDE on MIPS processors.
Copyright (C) 2014-2019 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 "elf-bfd.h"
#include "block.h"
#include "symtab.h"
#include "frame.h"
#include "frame-unwind.h"
#include "frame-base.h"
#include "trad-frame.h"
#include "mips-tdep.h"
/* Fill in the register cache *THIS_CACHE for THIS_FRAME for use
in the SDE frame unwinder. */
static struct trad_frame_cache *
mips_sde_frame_cache (struct frame_info *this_frame, void **this_cache)
{
struct gdbarch *gdbarch = get_frame_arch (this_frame);
const struct mips_regnum *regs = mips_regnum (gdbarch);
const int sizeof_reg_t = mips_abi_regsize (gdbarch);
enum mips_abi abi = mips_abi (gdbarch);
struct trad_frame_cache *cache;
CORE_ADDR xcpt_frame;
CORE_ADDR start_addr;
CORE_ADDR stack_addr;
CORE_ADDR pc;
int i;
if (*this_cache != NULL)
return (struct trad_frame_cache *) *this_cache;
cache = trad_frame_cache_zalloc (this_frame);
*this_cache = cache;
/* The previous registers are held in struct xcptcontext
which is at $sp+offs
struct xcptcontext {
reg_t sr; CP0 Status
reg_t cr; CP0 Cause
reg_t epc; CP0 EPC
reg_t vaddr; CP0 BadVAddr
reg_t regs[32]; General registers
reg_t mdlo; LO
reg_t mdhi; HI
reg_t mdex; ACX
...
};
*/
stack_addr = get_frame_register_signed (this_frame,
gdbarch_sp_regnum (gdbarch));
switch (abi)
{
case MIPS_ABI_O32:
/* 40: XCPTCONTEXT
24: xcpt_gen() argspace (16 bytes)
16: _xcptcall() saved ra, rounded up ( 8 bytes)
00: _xcptcall() argspace (16 bytes) */
xcpt_frame = stack_addr + 40;
break;
case MIPS_ABI_N32:
case MIPS_ABI_N64:
default: /* Wild guess. */
/* 16: XCPTCONTEXT
16: xcpt_gen() argspace ( 0 bytes)
00: _xcptcall() saved ra, rounded up (16 bytes) */
xcpt_frame = stack_addr + 16;
break;
}
trad_frame_set_reg_addr (cache,
MIPS_PS_REGNUM + gdbarch_num_regs (gdbarch),
xcpt_frame + 0 * sizeof_reg_t);
trad_frame_set_reg_addr (cache,
regs->cause + gdbarch_num_regs (gdbarch),
xcpt_frame + 1 * sizeof_reg_t);
trad_frame_set_reg_addr (cache,
regs->pc + gdbarch_num_regs (gdbarch),
xcpt_frame + 2 * sizeof_reg_t);
trad_frame_set_reg_addr (cache,
regs->badvaddr + gdbarch_num_regs (gdbarch),
xcpt_frame + 3 * sizeof_reg_t);
for (i = 0; i < MIPS_NUMREGS; i++)
trad_frame_set_reg_addr (cache,
i + MIPS_ZERO_REGNUM + gdbarch_num_regs (gdbarch),
xcpt_frame + (4 + i) * sizeof_reg_t);
trad_frame_set_reg_addr (cache,
regs->lo + gdbarch_num_regs (gdbarch),
xcpt_frame + 36 * sizeof_reg_t);
trad_frame_set_reg_addr (cache,
regs->hi + gdbarch_num_regs (gdbarch),
xcpt_frame + 37 * sizeof_reg_t);
pc = get_frame_pc (this_frame);
find_pc_partial_function (pc, NULL, &start_addr, NULL);
trad_frame_set_id (cache, frame_id_build (start_addr, stack_addr));
return cache;
}
/* Implement the this_id function for the SDE frame unwinder. */
static void
mips_sde_frame_this_id (struct frame_info *this_frame, void **this_cache,
struct frame_id *this_id)
{
struct trad_frame_cache *this_trad_cache
= mips_sde_frame_cache (this_frame, this_cache);
trad_frame_get_id (this_trad_cache, this_id);
}
/* Implement the prev_register function for the SDE frame unwinder. */
static struct value *
mips_sde_frame_prev_register (struct frame_info *this_frame,
void **this_cache,
int prev_regnum)
{
struct trad_frame_cache *trad_cache
= mips_sde_frame_cache (this_frame, this_cache);
return trad_frame_get_register (trad_cache, this_frame, prev_regnum);
}
/* Implement the sniffer function for the SDE frame unwinder. */
static int
mips_sde_frame_sniffer (const struct frame_unwind *self,
struct frame_info *this_frame,
void **this_cache)
{
CORE_ADDR pc = get_frame_pc (this_frame);
const char *name;
find_pc_partial_function (pc, &name, NULL, NULL);
return (name
&& (strcmp (name, "_xcptcall") == 0
|| strcmp (name, "_sigtramp") == 0));
}
/* Data structure for the SDE frame unwinder. */
static const struct frame_unwind mips_sde_frame_unwind =
{
SIGTRAMP_FRAME,
default_frame_unwind_stop_reason,
mips_sde_frame_this_id,
mips_sde_frame_prev_register,
NULL,
mips_sde_frame_sniffer
};
/* Implement the this_base, this_locals, and this_args hooks
for the normal unwinder. */
static CORE_ADDR
mips_sde_frame_base_address (struct frame_info *this_frame, void **this_cache)
{
struct trad_frame_cache *this_trad_cache
= mips_sde_frame_cache (this_frame, this_cache);
return trad_frame_get_this_base (this_trad_cache);
}
static const struct frame_base mips_sde_frame_base =
{
&mips_sde_frame_unwind,
mips_sde_frame_base_address,
mips_sde_frame_base_address,
mips_sde_frame_base_address
};
static const struct frame_base *
mips_sde_frame_base_sniffer (struct frame_info *this_frame)
{
if (mips_sde_frame_sniffer (&mips_sde_frame_unwind, this_frame, NULL))
return &mips_sde_frame_base;
else
return NULL;
}
static void
mips_sde_elf_osabi_sniff_abi_tag_sections (bfd *abfd, asection *sect,
void *obj)
{
enum gdb_osabi *os_ident_ptr = (enum gdb_osabi *) obj;
const char *name;
name = bfd_get_section_name (abfd, sect);
/* The presence of a section with a ".sde" prefix is indicative
of an SDE binary. */
if (startswith (name, ".sde"))
*os_ident_ptr = GDB_OSABI_SDE;
}
/* OSABI sniffer for MIPS SDE. */
static enum gdb_osabi
mips_sde_elf_osabi_sniffer (bfd *abfd)
{
enum gdb_osabi osabi = GDB_OSABI_UNKNOWN;
unsigned int elfosabi;
/* If the generic sniffer gets a hit, return and let other sniffers
get a crack at it. */
bfd_map_over_sections (abfd,
generic_elf_osabi_sniff_abi_tag_sections,
&osabi);
if (osabi != GDB_OSABI_UNKNOWN)
return GDB_OSABI_UNKNOWN;
elfosabi = elf_elfheader (abfd)->e_ident[EI_OSABI];
if (elfosabi == ELFOSABI_NONE)
{
/* When elfosabi is ELFOSABI_NONE (0), then the ELF structures in the
file are conforming to the base specification for that machine
(there are no OS-specific extensions). In order to determine the
real OS in use we must look for OS notes that have been added.
For SDE, we simply look for sections named with .sde as prefixes. */
bfd_map_over_sections (abfd,
mips_sde_elf_osabi_sniff_abi_tag_sections,
&osabi);
}
return osabi;
}
static void
mips_sde_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
{
frame_unwind_append_unwinder (gdbarch, &mips_sde_frame_unwind);
frame_base_append_sniffer (gdbarch, mips_sde_frame_base_sniffer);
}
void
_initialize_mips_sde_tdep (void)
{
gdbarch_register_osabi_sniffer (bfd_arch_mips,
bfd_target_elf_flavour,
mips_sde_elf_osabi_sniffer);
gdbarch_register_osabi (bfd_arch_mips, 0, GDB_OSABI_SDE, mips_sde_init_abi);
}
|
