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
|
/* Target-dependent code for NetBSD/powerpc.
Copyright (C) 2002-2012 Free Software Foundation, Inc.
Contributed by Wasabi Systems, 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 "gdbtypes.h"
#include "osabi.h"
#include "regcache.h"
#include "regset.h"
#include "trad-frame.h"
#include "tramp-frame.h"
#include "gdb_assert.h"
#include "gdb_string.h"
#include "ppc-tdep.h"
#include "ppcnbsd-tdep.h"
#include "solib-svr4.h"
/* Register offsets from <machine/reg.h>. */
struct ppc_reg_offsets ppcnbsd_reg_offsets;
/* Core file support. */
/* NetBSD/powerpc register sets. */
struct regset ppcnbsd_gregset =
{
&ppcnbsd_reg_offsets,
ppc_supply_gregset
};
struct regset ppcnbsd_fpregset =
{
&ppcnbsd_reg_offsets,
ppc_supply_fpregset
};
/* Return the appropriate register set for the core section identified
by SECT_NAME and SECT_SIZE. */
static const struct regset *
ppcnbsd_regset_from_core_section (struct gdbarch *gdbarch,
const char *sect_name, size_t sect_size)
{
if (strcmp (sect_name, ".reg") == 0 && sect_size >= 148)
return &ppcnbsd_gregset;
if (strcmp (sect_name, ".reg2") == 0 && sect_size >= 264)
return &ppcnbsd_fpregset;
return NULL;
}
/* NetBSD is confused. It appears that 1.5 was using the correct SVR4
convention but, 1.6 switched to the below broken convention. For
the moment use the broken convention. Ulgh! */
static enum return_value_convention
ppcnbsd_return_value (struct gdbarch *gdbarch, struct type *func_type,
struct type *valtype, struct regcache *regcache,
gdb_byte *readbuf, const gdb_byte *writebuf)
{
#if 0
if ((TYPE_CODE (valtype) == TYPE_CODE_STRUCT
|| TYPE_CODE (valtype) == TYPE_CODE_UNION)
&& !((TYPE_LENGTH (valtype) == 16 || TYPE_LENGTH (valtype) == 8)
&& TYPE_VECTOR (valtype))
&& !(TYPE_LENGTH (valtype) == 1
|| TYPE_LENGTH (valtype) == 2
|| TYPE_LENGTH (valtype) == 4
|| TYPE_LENGTH (valtype) == 8))
return RETURN_VALUE_STRUCT_CONVENTION;
else
#endif
return ppc_sysv_abi_broken_return_value (gdbarch, func_type, valtype,
regcache, readbuf, writebuf);
}
/* Signal trampolines. */
static const struct tramp_frame ppcnbsd2_sigtramp;
static void
ppcnbsd_sigtramp_cache_init (const struct tramp_frame *self,
struct frame_info *this_frame,
struct trad_frame_cache *this_cache,
CORE_ADDR func)
{
struct gdbarch *gdbarch = get_frame_arch (this_frame);
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
CORE_ADDR addr, base;
int i;
base = get_frame_register_unsigned (this_frame,
gdbarch_sp_regnum (gdbarch));
if (self == &ppcnbsd2_sigtramp)
addr = base + 0x10 + 2 * tdep->wordsize;
else
addr = base + 0x18 + 2 * tdep->wordsize;
for (i = 0; i < ppc_num_gprs; i++, addr += tdep->wordsize)
{
int regnum = i + tdep->ppc_gp0_regnum;
trad_frame_set_reg_addr (this_cache, regnum, addr);
}
trad_frame_set_reg_addr (this_cache, tdep->ppc_lr_regnum, addr);
addr += tdep->wordsize;
trad_frame_set_reg_addr (this_cache, tdep->ppc_cr_regnum, addr);
addr += tdep->wordsize;
trad_frame_set_reg_addr (this_cache, tdep->ppc_xer_regnum, addr);
addr += tdep->wordsize;
trad_frame_set_reg_addr (this_cache, tdep->ppc_ctr_regnum, addr);
addr += tdep->wordsize;
trad_frame_set_reg_addr (this_cache, gdbarch_pc_regnum (gdbarch),
addr); /* SRR0? */
addr += tdep->wordsize;
/* Construct the frame ID using the function start. */
trad_frame_set_id (this_cache, frame_id_build (base, func));
}
static const struct tramp_frame ppcnbsd_sigtramp =
{
SIGTRAMP_FRAME,
4,
{
{ 0x3821fff0, -1 }, /* add r1,r1,-16 */
{ 0x4e800021, -1 }, /* blrl */
{ 0x38610018, -1 }, /* addi r3,r1,24 */
{ 0x38000127, -1 }, /* li r0,295 */
{ 0x44000002, -1 }, /* sc */
{ 0x38000001, -1 }, /* li r0,1 */
{ 0x44000002, -1 }, /* sc */
{ TRAMP_SENTINEL_INSN, -1 }
},
ppcnbsd_sigtramp_cache_init
};
/* NetBSD 2.0 introduced a slightly different signal trampoline. */
static const struct tramp_frame ppcnbsd2_sigtramp =
{
SIGTRAMP_FRAME,
4,
{
{ 0x3821fff0, -1 }, /* add r1,r1,-16 */
{ 0x4e800021, -1 }, /* blrl */
{ 0x38610010, -1 }, /* addi r3,r1,16 */
{ 0x38000127, -1 }, /* li r0,295 */
{ 0x44000002, -1 }, /* sc */
{ 0x38000001, -1 }, /* li r0,1 */
{ 0x44000002, -1 }, /* sc */
{ TRAMP_SENTINEL_INSN, -1 }
},
ppcnbsd_sigtramp_cache_init
};
static void
ppcnbsd_init_abi (struct gdbarch_info info,
struct gdbarch *gdbarch)
{
/* For NetBSD, this is an on again, off again thing. Some systems
do use the broken struct convention, and some don't. */
set_gdbarch_return_value (gdbarch, ppcnbsd_return_value);
/* NetBSD uses SVR4-style shared libraries. */
set_solib_svr4_fetch_link_map_offsets
(gdbarch, svr4_ilp32_fetch_link_map_offsets);
set_gdbarch_regset_from_core_section
(gdbarch, ppcnbsd_regset_from_core_section);
tramp_frame_prepend_unwinder (gdbarch, &ppcnbsd_sigtramp);
tramp_frame_prepend_unwinder (gdbarch, &ppcnbsd2_sigtramp);
}
/* Provide a prototype to silence -Wmissing-prototypes. */
void _initialize_ppcnbsd_tdep (void);
void
_initialize_ppcnbsd_tdep (void)
{
gdbarch_register_osabi (bfd_arch_powerpc, 0, GDB_OSABI_NETBSD_ELF,
ppcnbsd_init_abi);
/* Avoid initializing the register offsets again if they were
already initailized by ppcnbsd-nat.c. */
if (ppcnbsd_reg_offsets.pc_offset == 0)
{
/* General-purpose registers. */
ppcnbsd_reg_offsets.r0_offset = 0;
ppcnbsd_reg_offsets.gpr_size = 4;
ppcnbsd_reg_offsets.xr_size = 4;
ppcnbsd_reg_offsets.lr_offset = 128;
ppcnbsd_reg_offsets.cr_offset = 132;
ppcnbsd_reg_offsets.xer_offset = 136;
ppcnbsd_reg_offsets.ctr_offset = 140;
ppcnbsd_reg_offsets.pc_offset = 144;
ppcnbsd_reg_offsets.ps_offset = -1;
ppcnbsd_reg_offsets.mq_offset = -1;
/* Floating-point registers. */
ppcnbsd_reg_offsets.f0_offset = 0;
ppcnbsd_reg_offsets.fpscr_offset = 256;
ppcnbsd_reg_offsets.fpscr_size = 4;
/* AltiVec registers. */
ppcnbsd_reg_offsets.vr0_offset = 0;
ppcnbsd_reg_offsets.vrsave_offset = 512;
ppcnbsd_reg_offsets.vscr_offset = 524;
}
}
|
