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
|
/* GNU/Linux/PowerPC specific low level interface, for the in-process
agent library for GDB.
Copyright (C) 2016-2018 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 "server.h"
#include <sys/mman.h>
#include "tracepoint.h"
#include "linux-ppc-tdesc.h"
#include <elf.h>
#ifdef HAVE_GETAUXVAL
#include <sys/auxv.h>
#endif
/* These macros define the position of registers in the buffer collected
by the fast tracepoint jump pad. */
#define FT_CR_R0 0
#define FT_CR_CR 32
#define FT_CR_XER 33
#define FT_CR_LR 34
#define FT_CR_CTR 35
#define FT_CR_PC 36
#define FT_CR_GPR(n) (FT_CR_R0 + (n))
static const int ppc_ft_collect_regmap[] = {
/* GPRs */
FT_CR_GPR (0), FT_CR_GPR (1), FT_CR_GPR (2),
FT_CR_GPR (3), FT_CR_GPR (4), FT_CR_GPR (5),
FT_CR_GPR (6), FT_CR_GPR (7), FT_CR_GPR (8),
FT_CR_GPR (9), FT_CR_GPR (10), FT_CR_GPR (11),
FT_CR_GPR (12), FT_CR_GPR (13), FT_CR_GPR (14),
FT_CR_GPR (15), FT_CR_GPR (16), FT_CR_GPR (17),
FT_CR_GPR (18), FT_CR_GPR (19), FT_CR_GPR (20),
FT_CR_GPR (21), FT_CR_GPR (22), FT_CR_GPR (23),
FT_CR_GPR (24), FT_CR_GPR (25), FT_CR_GPR (26),
FT_CR_GPR (27), FT_CR_GPR (28), FT_CR_GPR (29),
FT_CR_GPR (30), FT_CR_GPR (31),
/* FPRs - not collected. */
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
FT_CR_PC, /* PC */
-1, /* MSR */
FT_CR_CR, /* CR */
FT_CR_LR, /* LR */
FT_CR_CTR, /* CTR */
FT_CR_XER, /* XER */
-1, /* FPSCR */
};
#define PPC_NUM_FT_COLLECT_GREGS \
(sizeof (ppc_ft_collect_regmap) / sizeof(ppc_ft_collect_regmap[0]))
/* Supply registers collected by the fast tracepoint jump pad.
BUF is the second argument we pass to gdb_collect in jump pad. */
void
supply_fast_tracepoint_registers (struct regcache *regcache,
const unsigned char *buf)
{
int i;
for (i = 0; i < PPC_NUM_FT_COLLECT_GREGS; i++)
{
if (ppc_ft_collect_regmap[i] == -1)
continue;
supply_register (regcache, i,
((char *) buf)
+ ppc_ft_collect_regmap[i] * sizeof (long));
}
}
/* Return the value of register REGNUM. RAW_REGS is collected buffer
by jump pad. This function is called by emit_reg. */
ULONGEST
get_raw_reg (const unsigned char *raw_regs, int regnum)
{
if (regnum >= PPC_NUM_FT_COLLECT_GREGS)
return 0;
if (ppc_ft_collect_regmap[regnum] == -1)
return 0;
return *(unsigned long *) (raw_regs
+ ppc_ft_collect_regmap[regnum] * sizeof (long));
}
/* Allocate buffer for the jump pads. The branch instruction has a reach
of +/- 32MiB, and the executable is loaded at 0x10000000 (256MiB).
64-bit: To maximize the area of executable that can use tracepoints,
try allocating at 0x10000000 - size initially, decreasing until we hit
a free area.
32-bit: ld.so loads dynamic libraries right below the executable, so
we cannot depend on that area (dynamic libraries can be quite large).
Instead, aim right after the executable - at sbrk(0). This will
cause future brk to fail, and malloc will fallback to mmap. */
void *
alloc_jump_pad_buffer (size_t size)
{
#ifdef __powerpc64__
uintptr_t addr;
uintptr_t exec_base = getauxval (AT_PHDR);
int pagesize;
void *res;
if (exec_base == 0)
exec_base = 0x10000000;
pagesize = sysconf (_SC_PAGE_SIZE);
if (pagesize == -1)
perror_with_name ("sysconf");
addr = exec_base - size;
/* size should already be page-aligned, but this can't hurt. */
addr &= ~(pagesize - 1);
/* Search for a free area. If we hit 0, we're out of luck. */
for (; addr; addr -= pagesize)
{
/* No MAP_FIXED - we don't want to zap someone's mapping. */
res = mmap ((void *) addr, size,
PROT_READ | PROT_WRITE | PROT_EXEC,
MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
/* If we got what we wanted, return. */
if ((uintptr_t) res == addr)
return res;
/* If we got a mapping, but at a wrong address, undo it. */
if (res != MAP_FAILED)
munmap (res, size);
}
return NULL;
#else
void *target = sbrk (0);
void *res = mmap (target, size, PROT_READ | PROT_WRITE | PROT_EXEC,
MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
if (res == target)
return res;
if (res != MAP_FAILED)
munmap (res, size);
return NULL;
#endif
}
/* Return target_desc to use for IPA, given the tdesc index passed by
gdbserver. */
const struct target_desc *
get_ipa_tdesc (int idx)
{
switch (idx)
{
#ifdef __powerpc64__
case PPC_TDESC_BASE:
return tdesc_powerpc_64l;
case PPC_TDESC_ALTIVEC:
return tdesc_powerpc_altivec64l;
case PPC_TDESC_CELL:
return tdesc_powerpc_cell64l;
case PPC_TDESC_VSX:
return tdesc_powerpc_vsx64l;
case PPC_TDESC_ISA205:
return tdesc_powerpc_isa205_64l;
case PPC_TDESC_ISA205_ALTIVEC:
return tdesc_powerpc_isa205_altivec64l;
case PPC_TDESC_ISA205_VSX:
return tdesc_powerpc_isa205_vsx64l;
#else
case PPC_TDESC_BASE:
return tdesc_powerpc_32l;
case PPC_TDESC_ALTIVEC:
return tdesc_powerpc_altivec32l;
case PPC_TDESC_CELL:
return tdesc_powerpc_cell32l;
case PPC_TDESC_VSX:
return tdesc_powerpc_vsx32l;
case PPC_TDESC_ISA205:
return tdesc_powerpc_isa205_32l;
case PPC_TDESC_ISA205_ALTIVEC:
return tdesc_powerpc_isa205_altivec32l;
case PPC_TDESC_ISA205_VSX:
return tdesc_powerpc_isa205_vsx32l;
case PPC_TDESC_E500:
return tdesc_powerpc_e500l;
#endif
default:
internal_error (__FILE__, __LINE__,
"unknown ipa tdesc index: %d", idx);
#ifdef __powerpc64__
return tdesc_powerpc_64l;
#else
return tdesc_powerpc_32l;
#endif
}
}
/* Initialize ipa_tdesc and others. */
void
initialize_low_tracepoint (void)
{
#ifdef __powerpc64__
init_registers_powerpc_64l ();
init_registers_powerpc_altivec64l ();
init_registers_powerpc_cell64l ();
init_registers_powerpc_vsx64l ();
init_registers_powerpc_isa205_64l ();
init_registers_powerpc_isa205_altivec64l ();
init_registers_powerpc_isa205_vsx64l ();
#else
init_registers_powerpc_32l ();
init_registers_powerpc_altivec32l ();
init_registers_powerpc_cell32l ();
init_registers_powerpc_vsx32l ();
init_registers_powerpc_isa205_32l ();
init_registers_powerpc_isa205_altivec32l ();
init_registers_powerpc_isa205_vsx32l ();
init_registers_powerpc_e500l ();
#endif
}
|
