OpenCores
URL https://opencores.org/ocsvn/openrisc_me/openrisc_me/trunk

Subversion Repositories openrisc_me

[/] [openrisc/] [trunk/] [gnu-src/] [gdb-6.8/] [gdb/] [gdbserver/] [linux-arm-low.c] - Blame information for rev 157

Details | Compare with Previous | View Log

Line No. Rev Author Line
1 24 jeremybenn
/* GNU/Linux/ARM specific low level interface, for the remote server for GDB.
2
   Copyright (C) 1995, 1996, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
3
   2006, 2007, 2008 Free Software Foundation, Inc.
4
 
5
   This file is part of GDB.
6
 
7
   This program is free software; you can redistribute it and/or modify
8
   it under the terms of the GNU General Public License as published by
9
   the Free Software Foundation; either version 3 of the License, or
10
   (at your option) any later version.
11
 
12
   This program is distributed in the hope that it will be useful,
13
   but WITHOUT ANY WARRANTY; without even the implied warranty of
14
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15
   GNU General Public License for more details.
16
 
17
   You should have received a copy of the GNU General Public License
18
   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
19
 
20
#include "server.h"
21
#include "linux-low.h"
22
 
23
#include <sys/ptrace.h>
24
 
25
#include "gdb_proc_service.h"
26
 
27
#ifndef PTRACE_GET_THREAD_AREA
28
#define PTRACE_GET_THREAD_AREA 22
29
#endif
30
 
31
#ifndef PTRACE_GETWMMXREGS
32
# define PTRACE_GETWMMXREGS 18
33
# define PTRACE_SETWMMXREGS 19
34
#endif
35
 
36
#ifdef HAVE_SYS_REG_H
37
#include <sys/reg.h>
38
#endif
39
 
40
#define arm_num_regs 26
41
 
42
static int arm_regmap[] = {
43
  0, 4, 8, 12, 16, 20, 24, 28,
44
  32, 36, 40, 44, 48, 52, 56, 60,
45
  -1, -1, -1, -1, -1, -1, -1, -1, -1,
46
  64
47
};
48
 
49
static int
50
arm_cannot_store_register (int regno)
51
{
52
  return (regno >= arm_num_regs);
53
}
54
 
55
static int
56
arm_cannot_fetch_register (int regno)
57
{
58
  return (regno >= arm_num_regs);
59
}
60
 
61
static void
62
arm_fill_gregset (void *buf)
63
{
64
  int i;
65
 
66
  for (i = 0; i < arm_num_regs; i++)
67
    if (arm_regmap[i] != -1)
68
      collect_register (i, ((char *) buf) + arm_regmap[i]);
69
}
70
 
71
static void
72
arm_store_gregset (const void *buf)
73
{
74
  int i;
75
  char zerobuf[8];
76
 
77
  memset (zerobuf, 0, 8);
78
  for (i = 0; i < arm_num_regs; i++)
79
    if (arm_regmap[i] != -1)
80
      supply_register (i, ((char *) buf) + arm_regmap[i]);
81
    else
82
      supply_register (i, zerobuf);
83
}
84
 
85
#ifdef __IWMMXT__
86
 
87
static void
88
arm_fill_wmmxregset (void *buf)
89
{
90
  int i;
91
 
92
  for (i = 0; i < 16; i++)
93
    collect_register (arm_num_regs + i, (char *) buf + i * 8);
94
 
95
  /* We only have access to wcssf, wcasf, and wcgr0-wcgr3.  */
96
  for (i = 0; i < 6; i++)
97
    collect_register (arm_num_regs + i + 16, (char *) buf + 16 * 8 + i * 4);
98
}
99
 
100
static void
101
arm_store_wmmxregset (const void *buf)
102
{
103
  int i;
104
 
105
  for (i = 0; i < 16; i++)
106
    supply_register (arm_num_regs + i, (char *) buf + i * 8);
107
 
108
  /* We only have access to wcssf, wcasf, and wcgr0-wcgr3.  */
109
  for (i = 0; i < 6; i++)
110
    supply_register (arm_num_regs + i + 16, (char *) buf + 16 * 8 + i * 4);
111
}
112
 
113
#endif /* __IWMMXT__ */
114
 
115
extern int debug_threads;
116
 
117
static CORE_ADDR
118
arm_get_pc ()
119
{
120
  unsigned long pc;
121
  collect_register_by_name ("pc", &pc);
122
  if (debug_threads)
123
    fprintf (stderr, "stop pc is %08lx\n", pc);
124
  return pc;
125
}
126
 
127
static void
128
arm_set_pc (CORE_ADDR pc)
129
{
130
  unsigned long newpc = pc;
131
  supply_register_by_name ("pc", &newpc);
132
}
133
 
134
/* Correct in either endianness.  We do not support Thumb yet.  */
135
static const unsigned long arm_breakpoint = 0xef9f0001;
136
#define arm_breakpoint_len 4
137
 
138
/* For new EABI binaries.  We recognize it regardless of which ABI
139
   is used for gdbserver, so single threaded debugging should work
140
   OK, but for multi-threaded debugging we only insert the current
141
   ABI's breakpoint instruction.  For now at least.  */
142
static const unsigned long arm_eabi_breakpoint = 0xe7f001f0;
143
 
144
static int
145
arm_breakpoint_at (CORE_ADDR where)
146
{
147
  unsigned long insn;
148
 
149
  (*the_target->read_memory) (where, (unsigned char *) &insn, 4);
150
  if (insn == arm_breakpoint)
151
    return 1;
152
 
153
  if (insn == arm_eabi_breakpoint)
154
    return 1;
155
 
156
  /* If necessary, recognize more trap instructions here.  GDB only uses the
157
     two.  */
158
 
159
  return 0;
160
}
161
 
162
/* We only place breakpoints in empty marker functions, and thread locking
163
   is outside of the function.  So rather than importing software single-step,
164
   we can just run until exit.  */
165
static CORE_ADDR
166
arm_reinsert_addr ()
167
{
168
  unsigned long pc;
169
  collect_register_by_name ("lr", &pc);
170
  return pc;
171
}
172
 
173
/* Fetch the thread-local storage pointer for libthread_db.  */
174
 
175
ps_err_e
176
ps_get_thread_area (const struct ps_prochandle *ph,
177
                    lwpid_t lwpid, int idx, void **base)
178
{
179
  if (ptrace (PTRACE_GET_THREAD_AREA, lwpid, NULL, base) != 0)
180
    return PS_ERR;
181
 
182
  /* IDX is the bias from the thread pointer to the beginning of the
183
     thread descriptor.  It has to be subtracted due to implementation
184
     quirks in libthread_db.  */
185
  *base = (void *) ((char *)*base - idx);
186
 
187
  return PS_OK;
188
}
189
 
190
struct regset_info target_regsets[] = {
191
  { PTRACE_GETREGS, PTRACE_SETREGS, 18 * 4,
192
    GENERAL_REGS,
193
    arm_fill_gregset, arm_store_gregset },
194
#ifdef __IWMMXT__
195
  { PTRACE_GETWMMXREGS, PTRACE_SETWMMXREGS, 16 * 8 + 6 * 4,
196
    EXTENDED_REGS,
197
    arm_fill_wmmxregset, arm_store_wmmxregset },
198
#endif
199
  { 0, 0, -1, -1, NULL, NULL }
200
};
201
 
202
struct linux_target_ops the_low_target = {
203
  arm_num_regs,
204
  arm_regmap,
205
  arm_cannot_fetch_register,
206
  arm_cannot_store_register,
207
  arm_get_pc,
208
  arm_set_pc,
209
#ifndef __ARM_EABI__
210
  (const unsigned char *) &arm_breakpoint,
211
#else
212
  (const unsigned char *) &arm_eabi_breakpoint,
213
#endif
214
  arm_breakpoint_len,
215
  arm_reinsert_addr,
216
  0,
217
  arm_breakpoint_at,
218
};

powered by: WebSVN 2.1.0

© copyright 1999-2024 OpenCores.org, equivalent to Oliscience, all rights reserved. OpenCores®, registered trademark.