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0a30fbc4 | 1 | /* GNU/Linux/ARM specific low level interface, for the remote server for GDB. |
9308fc88 DJ |
2 | Copyright (C) 1995, 1996, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, |
3 | 2006 | |
0a30fbc4 DJ |
4 | Free Software Foundation, Inc. |
5 | ||
6 | This file is part of GDB. | |
7 | ||
8 | This program is free software; you can redistribute it and/or modify | |
9 | it under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 2 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | This program is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with this program; if not, write to the Free Software | |
6f0f660e EZ |
20 | Foundation, Inc., 51 Franklin Street, Fifth Floor, |
21 | Boston, MA 02110-1301, USA. */ | |
0a30fbc4 DJ |
22 | |
23 | #include "server.h" | |
58caa3dc | 24 | #include "linux-low.h" |
0a30fbc4 | 25 | |
9308fc88 DJ |
26 | #include <sys/ptrace.h> |
27 | ||
28 | #include "gdb_proc_service.h" | |
29 | ||
30 | #ifndef PTRACE_GET_THREAD_AREA | |
31 | #define PTRACE_GET_THREAD_AREA 22 | |
32 | #endif | |
33 | ||
0a30fbc4 DJ |
34 | #ifdef HAVE_SYS_REG_H |
35 | #include <sys/reg.h> | |
36 | #endif | |
37 | ||
23ce3b1c | 38 | #define arm_num_regs 26 |
0a30fbc4 | 39 | |
2ec06d2e | 40 | static int arm_regmap[] = { |
0a30fbc4 DJ |
41 | 0, 4, 8, 12, 16, 20, 24, 28, |
42 | 32, 36, 40, 44, 48, 52, 56, 60, | |
23ce3b1c DJ |
43 | -1, -1, -1, -1, -1, -1, -1, -1, -1, |
44 | 64 | |
0a30fbc4 DJ |
45 | }; |
46 | ||
2ec06d2e DJ |
47 | static int |
48 | arm_cannot_store_register (int regno) | |
0a30fbc4 | 49 | { |
2ec06d2e | 50 | return (regno >= arm_num_regs); |
0a30fbc4 DJ |
51 | } |
52 | ||
2ec06d2e DJ |
53 | static int |
54 | arm_cannot_fetch_register (int regno) | |
0a30fbc4 | 55 | { |
2ec06d2e | 56 | return (regno >= arm_num_regs); |
0a30fbc4 DJ |
57 | } |
58 | ||
d677d77d DJ |
59 | extern int debug_threads; |
60 | ||
0d62e5e8 DJ |
61 | static CORE_ADDR |
62 | arm_get_pc () | |
63 | { | |
64 | unsigned long pc; | |
65 | collect_register_by_name ("pc", &pc); | |
d677d77d DJ |
66 | if (debug_threads) |
67 | fprintf (stderr, "stop pc is %08lx\n", pc); | |
0d62e5e8 DJ |
68 | return pc; |
69 | } | |
70 | ||
71 | static void | |
72 | arm_set_pc (CORE_ADDR pc) | |
73 | { | |
74 | unsigned long newpc = pc; | |
75 | supply_register_by_name ("pc", &newpc); | |
76 | } | |
77 | ||
78 | /* Correct in either endianness. We do not support Thumb yet. */ | |
79 | static const unsigned long arm_breakpoint = 0xef9f0001; | |
80 | #define arm_breakpoint_len 4 | |
81 | ||
9d1fb177 DJ |
82 | /* For new EABI binaries. We recognize it regardless of which ABI |
83 | is used for gdbserver, so single threaded debugging should work | |
84 | OK, but for multi-threaded debugging we only insert the current | |
85 | ABI's breakpoint instruction. For now at least. */ | |
86 | static const unsigned long arm_eabi_breakpoint = 0xe7f001f0; | |
87 | ||
0d62e5e8 DJ |
88 | static int |
89 | arm_breakpoint_at (CORE_ADDR where) | |
90 | { | |
91 | unsigned long insn; | |
92 | ||
f450004a | 93 | (*the_target->read_memory) (where, (unsigned char *) &insn, 4); |
0d62e5e8 DJ |
94 | if (insn == arm_breakpoint) |
95 | return 1; | |
96 | ||
9d1fb177 DJ |
97 | if (insn == arm_eabi_breakpoint) |
98 | return 1; | |
99 | ||
0d62e5e8 | 100 | /* If necessary, recognize more trap instructions here. GDB only uses the |
9d1fb177 DJ |
101 | two. */ |
102 | ||
0d62e5e8 DJ |
103 | return 0; |
104 | } | |
105 | ||
3b2fc2ea DJ |
106 | /* We only place breakpoints in empty marker functions, and thread locking |
107 | is outside of the function. So rather than importing software single-step, | |
108 | we can just run until exit. */ | |
109 | static CORE_ADDR | |
110 | arm_reinsert_addr () | |
111 | { | |
112 | unsigned long pc; | |
113 | collect_register_by_name ("lr", &pc); | |
114 | return pc; | |
115 | } | |
116 | ||
9308fc88 DJ |
117 | /* Fetch the thread-local storage pointer for libthread_db. */ |
118 | ||
119 | ps_err_e | |
120 | ps_get_thread_area (const struct ps_prochandle *ph, | |
121 | lwpid_t lwpid, int idx, void **base) | |
122 | { | |
123 | if (ptrace (PTRACE_GET_THREAD_AREA, lwpid, NULL, base) != 0) | |
124 | return PS_ERR; | |
125 | ||
126 | /* IDX is the bias from the thread pointer to the beginning of the | |
127 | thread descriptor. It has to be subtracted due to implementation | |
128 | quirks in libthread_db. */ | |
129 | *base = (void *) ((char *)*base - idx); | |
130 | ||
131 | return PS_OK; | |
132 | } | |
133 | ||
2ec06d2e DJ |
134 | struct linux_target_ops the_low_target = { |
135 | arm_num_regs, | |
136 | arm_regmap, | |
137 | arm_cannot_fetch_register, | |
138 | arm_cannot_store_register, | |
0d62e5e8 DJ |
139 | arm_get_pc, |
140 | arm_set_pc, | |
9d1fb177 | 141 | #ifndef __ARM_EABI__ |
f450004a | 142 | (const unsigned char *) &arm_breakpoint, |
9d1fb177 DJ |
143 | #else |
144 | (const unsigned char *) &arm_eabi_breakpoint, | |
145 | #endif | |
0d62e5e8 | 146 | arm_breakpoint_len, |
3b2fc2ea | 147 | arm_reinsert_addr, |
0d62e5e8 DJ |
148 | 0, |
149 | arm_breakpoint_at, | |
2ec06d2e | 150 | }; |