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
|
/* Target-dependent code for Solaris SPARC.
Copyright (C) 2003, 2004, 2006, 2007 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 2 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, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA. */
#include "defs.h"
#include "frame.h"
#include "frame-unwind.h"
#include "gdbcore.h"
#include "symtab.h"
#include "objfiles.h"
#include "osabi.h"
#include "regcache.h"
#include "target.h"
#include "trad-frame.h"
#include "gdb_assert.h"
#include "gdb_string.h"
#include "sol2-tdep.h"
#include "sparc-tdep.h"
#include "solib-svr4.h"
/* From <sys/regset.h>. */
const struct sparc_gregset sparc32_sol2_gregset =
{
32 * 4, /* %psr */
33 * 4, /* %pc */
34 * 4, /* %npc */
35 * 4, /* %y */
36 * 4, /* %wim */
37 * 4, /* %tbr */
1 * 4, /* %g1 */
16 * 4, /* %l0 */
};
/* The Solaris signal trampolines reside in libc. For normal signals,
the function `sigacthandler' is used. This signal trampoline will
call the signal handler using the System V calling convention,
where the third argument is a pointer to an instance of
`ucontext_t', which has a member `uc_mcontext' that contains the
saved registers. Incidentally, the kernel passes the `ucontext_t'
pointer as the third argument of the signal trampoline too, and
`sigacthandler' simply passes it on. However, if you link your
program with "-L/usr/ucblib -R/usr/ucblib -lucb", the function
`ucbsigvechandler' will be used, which invokes the using the BSD
convention, where the third argument is a pointer to an instance of
`struct sigcontext'. It is the `ucbsigvechandler' function that
converts the `ucontext_t' to a `sigcontext', and back. Unless the
signal handler modifies the `struct sigcontext' we can safely
ignore this. */
int
sparc_sol2_pc_in_sigtramp (CORE_ADDR pc, char *name)
{
return (name && (strcmp (name, "sigacthandler") == 0
|| strcmp (name, "ucbsigvechandler") == 0
|| strcmp (name, "__sighndlr") == 0));
}
static struct sparc_frame_cache *
sparc32_sol2_sigtramp_frame_cache (struct frame_info *next_frame,
void **this_cache)
{
struct sparc_frame_cache *cache;
CORE_ADDR mcontext_addr, addr;
int regnum;
if (*this_cache)
return *this_cache;
cache = sparc_frame_cache (next_frame, this_cache);
gdb_assert (cache == *this_cache);
cache->saved_regs = trad_frame_alloc_saved_regs (next_frame);
/* The third argument is a pointer to an instance of `ucontext_t',
which has a member `uc_mcontext' that contains the saved
registers. */
regnum = (cache->frameless_p ? SPARC_O2_REGNUM : SPARC_I2_REGNUM);
mcontext_addr = frame_unwind_register_unsigned (next_frame, regnum) + 40;
cache->saved_regs[SPARC32_PSR_REGNUM].addr = mcontext_addr + 0 * 4;
cache->saved_regs[SPARC32_PC_REGNUM].addr = mcontext_addr + 1 * 4;
cache->saved_regs[SPARC32_NPC_REGNUM].addr = mcontext_addr + 2 * 4;
cache->saved_regs[SPARC32_Y_REGNUM].addr = mcontext_addr + 3 * 4;
/* Since %g0 is always zero, keep the identity encoding. */
for (regnum = SPARC_G1_REGNUM, addr = mcontext_addr + 4 * 4;
regnum <= SPARC_O7_REGNUM; regnum++, addr += 4)
cache->saved_regs[regnum].addr = addr;
if (get_frame_memory_unsigned (next_frame, mcontext_addr + 19 * 4, 4))
{
/* The register windows haven't been flushed. */
for (regnum = SPARC_L0_REGNUM; regnum <= SPARC_I7_REGNUM; regnum++)
trad_frame_set_unknown (cache->saved_regs, regnum);
}
else
{
addr = cache->saved_regs[SPARC_SP_REGNUM].addr;
addr = get_frame_memory_unsigned (next_frame, addr, 4);
for (regnum = SPARC_L0_REGNUM;
regnum <= SPARC_I7_REGNUM; regnum++, addr += 4)
cache->saved_regs[regnum].addr = addr;
}
return cache;
}
static void
sparc32_sol2_sigtramp_frame_this_id (struct frame_info *next_frame,
void **this_cache,
struct frame_id *this_id)
{
struct sparc_frame_cache *cache =
sparc32_sol2_sigtramp_frame_cache (next_frame, this_cache);
(*this_id) = frame_id_build (cache->base, cache->pc);
}
static void
sparc32_sol2_sigtramp_frame_prev_register (struct frame_info *next_frame,
void **this_cache,
int regnum, int *optimizedp,
enum lval_type *lvalp,
CORE_ADDR *addrp,
int *realnump, gdb_byte *valuep)
{
struct sparc_frame_cache *cache =
sparc32_sol2_sigtramp_frame_cache (next_frame, this_cache);
trad_frame_get_prev_register (next_frame, cache->saved_regs, regnum,
optimizedp, lvalp, addrp, realnump, valuep);
}
static const struct frame_unwind sparc32_sol2_sigtramp_frame_unwind =
{
SIGTRAMP_FRAME,
sparc32_sol2_sigtramp_frame_this_id,
sparc32_sol2_sigtramp_frame_prev_register
};
static const struct frame_unwind *
sparc32_sol2_sigtramp_frame_sniffer (struct frame_info *next_frame)
{
CORE_ADDR pc = frame_pc_unwind (next_frame);
char *name;
find_pc_partial_function (pc, &name, NULL, NULL);
if (sparc_sol2_pc_in_sigtramp (pc, name))
return &sparc32_sol2_sigtramp_frame_unwind;
return NULL;
}
void
sparc32_sol2_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
{
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
/* Solaris has SVR4-style shared libraries... */
set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target);
set_gdbarch_skip_solib_resolver (gdbarch, sol2_skip_solib_resolver);
set_solib_svr4_fetch_link_map_offsets
(gdbarch, svr4_ilp32_fetch_link_map_offsets);
/* ...which means that we need some special handling when doing
prologue analysis. */
tdep->plt_entry_size = 12;
/* Solaris has kernel-assisted single-stepping support. */
set_gdbarch_software_single_step (gdbarch, NULL);
frame_unwind_append_sniffer (gdbarch, sparc32_sol2_sigtramp_frame_sniffer);
}
/* Provide a prototype to silence -Wmissing-prototypes. */
void _initialize_sparc_sol2_tdep (void);
void
_initialize_sparc_sol2_tdep (void)
{
gdbarch_register_osabi (bfd_arch_sparc, 0,
GDB_OSABI_SOLARIS, sparc32_sol2_init_abi);
}
|
