1 /* 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.
5 This file is part of GDB.
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.
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.
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/>. */
21 #include "linux-low.h"
23 #include <sys/ptrace.h>
25 #include "gdb_proc_service.h"
27 #ifndef PTRACE_GET_THREAD_AREA
28 #define PTRACE_GET_THREAD_AREA 22
31 #ifndef PTRACE_GETWMMXREGS
32 # define PTRACE_GETWMMXREGS 18
33 # define PTRACE_SETWMMXREGS 19
40 #define arm_num_regs 26
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,
50 arm_cannot_store_register (int regno
)
52 return (regno
>= arm_num_regs
);
56 arm_cannot_fetch_register (int regno
)
58 return (regno
>= arm_num_regs
);
62 arm_fill_gregset (void *buf
)
66 for (i
= 0; i
< arm_num_regs
; i
++)
67 if (arm_regmap
[i
] != -1)
68 collect_register (i
, ((char *) buf
) + arm_regmap
[i
]);
72 arm_store_gregset (const void *buf
)
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
]);
82 supply_register (i
, zerobuf
);
88 arm_fill_wmmxregset (void *buf
)
92 for (i
= 0; i
< 16; i
++)
93 collect_register (arm_num_regs
+ i
, (char *) buf
+ i
* 8);
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);
101 arm_store_wmmxregset (const void *buf
)
105 for (i
= 0; i
< 16; i
++)
106 supply_register (arm_num_regs
+ i
, (char *) buf
+ i
* 8);
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);
113 #endif /* __IWMMXT__ */
115 extern int debug_threads
;
121 collect_register_by_name ("pc", &pc
);
123 fprintf (stderr
, "stop pc is %08lx\n", pc
);
128 arm_set_pc (CORE_ADDR pc
)
130 unsigned long newpc
= pc
;
131 supply_register_by_name ("pc", &newpc
);
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
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;
145 arm_breakpoint_at (CORE_ADDR where
)
149 (*the_target
->read_memory
) (where
, (unsigned char *) &insn
, 4);
150 if (insn
== arm_breakpoint
)
153 if (insn
== arm_eabi_breakpoint
)
156 /* If necessary, recognize more trap instructions here. GDB only uses the
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. */
169 collect_register_by_name ("lr", &pc
);
173 /* Fetch the thread-local storage pointer for libthread_db. */
176 ps_get_thread_area (const struct ps_prochandle
*ph
,
177 lwpid_t lwpid
, int idx
, void **base
)
179 if (ptrace (PTRACE_GET_THREAD_AREA
, lwpid
, NULL
, base
) != 0)
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
);
190 struct regset_info target_regsets
[] = {
191 { PTRACE_GETREGS
, PTRACE_SETREGS
, 18 * 4,
193 arm_fill_gregset
, arm_store_gregset
},
195 { PTRACE_GETWMMXREGS
, PTRACE_SETWMMXREGS
, 16 * 8 + 6 * 4,
197 arm_fill_wmmxregset
, arm_store_wmmxregset
},
199 { 0, 0, -1, -1, NULL
, NULL
}
202 struct linux_target_ops the_low_target
= {
205 arm_cannot_fetch_register
,
206 arm_cannot_store_register
,
210 (const unsigned char *) &arm_breakpoint
,
212 (const unsigned char *) &arm_eabi_breakpoint
,