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, 2009, 2010 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 /* Don't include elf.h if linux/elf.h got included by gdb_proc_service.h.
24 On Bionic elf.h and linux/elf.h have conflicting definitions. */
28 #include <sys/ptrace.h>
30 /* Defined in auto-generated files. */
31 void init_registers_arm (void);
32 void init_registers_arm_with_iwmmxt (void);
33 void init_registers_arm_with_vfpv2 (void);
34 void init_registers_arm_with_vfpv3 (void);
35 void init_registers_arm_with_neon (void);
37 #ifndef PTRACE_GET_THREAD_AREA
38 #define PTRACE_GET_THREAD_AREA 22
41 #ifndef PTRACE_GETWMMXREGS
42 # define PTRACE_GETWMMXREGS 18
43 # define PTRACE_SETWMMXREGS 19
46 #ifndef PTRACE_GETVFPREGS
47 # define PTRACE_GETVFPREGS 27
48 # define PTRACE_SETVFPREGS 28
51 static unsigned long arm_hwcap
;
53 /* These are in <asm/elf.h> in current kernels. */
55 #define HWCAP_IWMMXT 512
56 #define HWCAP_NEON 4096
57 #define HWCAP_VFPv3 8192
58 #define HWCAP_VFPv3D16 16384
64 #define arm_num_regs 26
66 static int arm_regmap
[] = {
67 0, 4, 8, 12, 16, 20, 24, 28,
68 32, 36, 40, 44, 48, 52, 56, 60,
69 -1, -1, -1, -1, -1, -1, -1, -1, -1,
74 arm_cannot_store_register (int regno
)
76 return (regno
>= arm_num_regs
);
80 arm_cannot_fetch_register (int regno
)
82 return (regno
>= arm_num_regs
);
86 arm_fill_gregset (struct regcache
*regcache
, void *buf
)
90 for (i
= 0; i
< arm_num_regs
; i
++)
91 if (arm_regmap
[i
] != -1)
92 collect_register (regcache
, i
, ((char *) buf
) + arm_regmap
[i
]);
96 arm_store_gregset (struct regcache
*regcache
, const void *buf
)
101 memset (zerobuf
, 0, 8);
102 for (i
= 0; i
< arm_num_regs
; i
++)
103 if (arm_regmap
[i
] != -1)
104 supply_register (regcache
, i
, ((char *) buf
) + arm_regmap
[i
]);
106 supply_register (regcache
, i
, zerobuf
);
110 arm_fill_wmmxregset (struct regcache
*regcache
, void *buf
)
114 if (!(arm_hwcap
& HWCAP_IWMMXT
))
117 for (i
= 0; i
< 16; i
++)
118 collect_register (regcache
, arm_num_regs
+ i
, (char *) buf
+ i
* 8);
120 /* We only have access to wcssf, wcasf, and wcgr0-wcgr3. */
121 for (i
= 0; i
< 6; i
++)
122 collect_register (regcache
, arm_num_regs
+ i
+ 16,
123 (char *) buf
+ 16 * 8 + i
* 4);
127 arm_store_wmmxregset (struct regcache
*regcache
, const void *buf
)
131 if (!(arm_hwcap
& HWCAP_IWMMXT
))
134 for (i
= 0; i
< 16; i
++)
135 supply_register (regcache
, arm_num_regs
+ i
, (char *) buf
+ i
* 8);
137 /* We only have access to wcssf, wcasf, and wcgr0-wcgr3. */
138 for (i
= 0; i
< 6; i
++)
139 supply_register (regcache
, arm_num_regs
+ i
+ 16,
140 (char *) buf
+ 16 * 8 + i
* 4);
144 arm_fill_vfpregset (struct regcache
*regcache
, void *buf
)
148 if (!(arm_hwcap
& HWCAP_VFP
))
151 if ((arm_hwcap
& (HWCAP_VFPv3
| HWCAP_VFPv3D16
)) == HWCAP_VFPv3
)
156 base
= find_regno ("d0");
157 for (i
= 0; i
< num
; i
++)
158 collect_register (regcache
, base
+ i
, (char *) buf
+ i
* 8);
160 collect_register_by_name (regcache
, "fpscr", (char *) buf
+ 32 * 8);
164 arm_store_vfpregset (struct regcache
*regcache
, const void *buf
)
168 if (!(arm_hwcap
& HWCAP_VFP
))
171 if ((arm_hwcap
& (HWCAP_VFPv3
| HWCAP_VFPv3D16
)) == HWCAP_VFPv3
)
176 base
= find_regno ("d0");
177 for (i
= 0; i
< num
; i
++)
178 supply_register (regcache
, base
+ i
, (char *) buf
+ i
* 8);
180 supply_register_by_name (regcache
, "fpscr", (char *) buf
+ 32 * 8);
183 extern int debug_threads
;
186 arm_get_pc (struct regcache
*regcache
)
189 collect_register_by_name (regcache
, "pc", &pc
);
191 fprintf (stderr
, "stop pc is %08lx\n", pc
);
196 arm_set_pc (struct regcache
*regcache
, CORE_ADDR pc
)
198 unsigned long newpc
= pc
;
199 supply_register_by_name (regcache
, "pc", &newpc
);
202 /* Correct in either endianness. */
203 static const unsigned long arm_breakpoint
= 0xef9f0001;
204 #define arm_breakpoint_len 4
205 static const unsigned short thumb_breakpoint
= 0xde01;
206 static const unsigned short thumb2_breakpoint
[] = { 0xf7f0, 0xa000 };
208 /* For new EABI binaries. We recognize it regardless of which ABI
209 is used for gdbserver, so single threaded debugging should work
210 OK, but for multi-threaded debugging we only insert the current
211 ABI's breakpoint instruction. For now at least. */
212 static const unsigned long arm_eabi_breakpoint
= 0xe7f001f0;
215 arm_breakpoint_at (CORE_ADDR where
)
217 struct regcache
*regcache
= get_thread_regcache (current_inferior
, 1);
220 collect_register_by_name (regcache
, "cpsr", &cpsr
);
227 (*the_target
->read_memory
) (where
, (unsigned char *) &insn
, 2);
228 if (insn
== thumb_breakpoint
)
231 if (insn
== thumb2_breakpoint
[0])
233 (*the_target
->read_memory
) (where
+ 2, (unsigned char *) &insn
, 2);
234 if (insn
== thumb2_breakpoint
[1])
243 (*the_target
->read_memory
) (where
, (unsigned char *) &insn
, 4);
244 if (insn
== arm_breakpoint
)
247 if (insn
== arm_eabi_breakpoint
)
254 /* We only place breakpoints in empty marker functions, and thread locking
255 is outside of the function. So rather than importing software single-step,
256 we can just run until exit. */
258 arm_reinsert_addr (void)
260 struct regcache
*regcache
= get_thread_regcache (current_inferior
, 1);
262 collect_register_by_name (regcache
, "lr", &pc
);
266 /* Fetch the thread-local storage pointer for libthread_db. */
269 ps_get_thread_area (const struct ps_prochandle
*ph
,
270 lwpid_t lwpid
, int idx
, void **base
)
272 if (ptrace (PTRACE_GET_THREAD_AREA
, lwpid
, NULL
, base
) != 0)
275 /* IDX is the bias from the thread pointer to the beginning of the
276 thread descriptor. It has to be subtracted due to implementation
277 quirks in libthread_db. */
278 *base
= (void *) ((char *)*base
- idx
);
284 arm_get_hwcap (unsigned long *valp
)
286 unsigned char *data
= alloca (8);
289 while ((*the_target
->read_auxv
) (offset
, data
, 8) == 8)
291 unsigned int *data_p
= (unsigned int *)data
;
292 if (data_p
[0] == AT_HWCAP
)
306 arm_arch_setup (void)
309 if (arm_get_hwcap (&arm_hwcap
) == 0)
311 init_registers_arm ();
315 if (arm_hwcap
& HWCAP_IWMMXT
)
317 init_registers_arm_with_iwmmxt ();
321 if (arm_hwcap
& HWCAP_VFP
)
326 /* NEON implies either no VFP, or VFPv3-D32. We only support
328 if (arm_hwcap
& HWCAP_NEON
)
329 init_registers_arm_with_neon ();
330 else if ((arm_hwcap
& (HWCAP_VFPv3
| HWCAP_VFPv3D16
)) == HWCAP_VFPv3
)
331 init_registers_arm_with_vfpv3 ();
333 init_registers_arm_with_vfpv2 ();
335 /* Now make sure that the kernel supports reading these
336 registers. Support was added in 2.6.30. */
337 pid
= lwpid_of (get_thread_lwp (current_inferior
));
339 buf
= malloc (32 * 8 + 4);
340 if (ptrace (PTRACE_GETVFPREGS
, pid
, 0, buf
) < 0
344 init_registers_arm ();
351 /* The default configuration uses legacy FPA registers, probably
353 init_registers_arm ();
356 struct regset_info target_regsets
[] = {
357 { PTRACE_GETREGS
, PTRACE_SETREGS
, 0, 18 * 4,
359 arm_fill_gregset
, arm_store_gregset
},
360 { PTRACE_GETWMMXREGS
, PTRACE_SETWMMXREGS
, 0, 16 * 8 + 6 * 4,
362 arm_fill_wmmxregset
, arm_store_wmmxregset
},
363 { PTRACE_GETVFPREGS
, PTRACE_SETVFPREGS
, 0, 32 * 8 + 4,
365 arm_fill_vfpregset
, arm_store_vfpregset
},
366 { 0, 0, 0, -1, -1, NULL
, NULL
}
369 struct linux_target_ops the_low_target
= {
373 arm_cannot_fetch_register
,
374 arm_cannot_store_register
,
378 /* Define an ARM-mode breakpoint; we only set breakpoints in the C
379 library, which is most likely to be ARM. If the kernel supports
380 clone events, we will never insert a breakpoint, so even a Thumb
381 C library will work; so will mixing EABI/non-EABI gdbserver and
384 (const unsigned char *) &arm_breakpoint
,
386 (const unsigned char *) &arm_eabi_breakpoint
,