Commit | Line | Data |
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0a30fbc4 | 1 | /* GNU/Linux/ARM specific low level interface, for the remote server for GDB. |
6f0f660e | 2 | Copyright (C) 1995, 1996, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005 |
0a30fbc4 DJ |
3 | 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 2 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, write to the Free Software | |
6f0f660e EZ |
19 | Foundation, Inc., 51 Franklin Street, Fifth Floor, |
20 | Boston, MA 02110-1301, USA. */ | |
0a30fbc4 DJ |
21 | |
22 | #include "server.h" | |
58caa3dc | 23 | #include "linux-low.h" |
0a30fbc4 DJ |
24 | |
25 | #ifdef HAVE_SYS_REG_H | |
26 | #include <sys/reg.h> | |
27 | #endif | |
28 | ||
23ce3b1c | 29 | #define arm_num_regs 26 |
0a30fbc4 | 30 | |
2ec06d2e | 31 | static int arm_regmap[] = { |
0a30fbc4 DJ |
32 | 0, 4, 8, 12, 16, 20, 24, 28, |
33 | 32, 36, 40, 44, 48, 52, 56, 60, | |
23ce3b1c DJ |
34 | -1, -1, -1, -1, -1, -1, -1, -1, -1, |
35 | 64 | |
0a30fbc4 DJ |
36 | }; |
37 | ||
2ec06d2e DJ |
38 | static int |
39 | arm_cannot_store_register (int regno) | |
0a30fbc4 | 40 | { |
2ec06d2e | 41 | return (regno >= arm_num_regs); |
0a30fbc4 DJ |
42 | } |
43 | ||
2ec06d2e DJ |
44 | static int |
45 | arm_cannot_fetch_register (int regno) | |
0a30fbc4 | 46 | { |
2ec06d2e | 47 | return (regno >= arm_num_regs); |
0a30fbc4 DJ |
48 | } |
49 | ||
d677d77d DJ |
50 | extern int debug_threads; |
51 | ||
0d62e5e8 DJ |
52 | static CORE_ADDR |
53 | arm_get_pc () | |
54 | { | |
55 | unsigned long pc; | |
56 | collect_register_by_name ("pc", &pc); | |
d677d77d DJ |
57 | if (debug_threads) |
58 | fprintf (stderr, "stop pc is %08lx\n", pc); | |
0d62e5e8 DJ |
59 | return pc; |
60 | } | |
61 | ||
62 | static void | |
63 | arm_set_pc (CORE_ADDR pc) | |
64 | { | |
65 | unsigned long newpc = pc; | |
66 | supply_register_by_name ("pc", &newpc); | |
67 | } | |
68 | ||
69 | /* Correct in either endianness. We do not support Thumb yet. */ | |
70 | static const unsigned long arm_breakpoint = 0xef9f0001; | |
71 | #define arm_breakpoint_len 4 | |
72 | ||
9d1fb177 DJ |
73 | /* For new EABI binaries. We recognize it regardless of which ABI |
74 | is used for gdbserver, so single threaded debugging should work | |
75 | OK, but for multi-threaded debugging we only insert the current | |
76 | ABI's breakpoint instruction. For now at least. */ | |
77 | static const unsigned long arm_eabi_breakpoint = 0xe7f001f0; | |
78 | ||
0d62e5e8 DJ |
79 | static int |
80 | arm_breakpoint_at (CORE_ADDR where) | |
81 | { | |
82 | unsigned long insn; | |
83 | ||
f450004a | 84 | (*the_target->read_memory) (where, (unsigned char *) &insn, 4); |
0d62e5e8 DJ |
85 | if (insn == arm_breakpoint) |
86 | return 1; | |
87 | ||
9d1fb177 DJ |
88 | if (insn == arm_eabi_breakpoint) |
89 | return 1; | |
90 | ||
0d62e5e8 | 91 | /* If necessary, recognize more trap instructions here. GDB only uses the |
9d1fb177 DJ |
92 | two. */ |
93 | ||
0d62e5e8 DJ |
94 | return 0; |
95 | } | |
96 | ||
3b2fc2ea DJ |
97 | /* We only place breakpoints in empty marker functions, and thread locking |
98 | is outside of the function. So rather than importing software single-step, | |
99 | we can just run until exit. */ | |
100 | static CORE_ADDR | |
101 | arm_reinsert_addr () | |
102 | { | |
103 | unsigned long pc; | |
104 | collect_register_by_name ("lr", &pc); | |
105 | return pc; | |
106 | } | |
107 | ||
2ec06d2e DJ |
108 | struct linux_target_ops the_low_target = { |
109 | arm_num_regs, | |
110 | arm_regmap, | |
111 | arm_cannot_fetch_register, | |
112 | arm_cannot_store_register, | |
0d62e5e8 DJ |
113 | arm_get_pc, |
114 | arm_set_pc, | |
9d1fb177 | 115 | #ifndef __ARM_EABI__ |
f450004a | 116 | (const unsigned char *) &arm_breakpoint, |
9d1fb177 DJ |
117 | #else |
118 | (const unsigned char *) &arm_eabi_breakpoint, | |
119 | #endif | |
0d62e5e8 | 120 | arm_breakpoint_len, |
3b2fc2ea | 121 | arm_reinsert_addr, |
0d62e5e8 DJ |
122 | 0, |
123 | arm_breakpoint_at, | |
2ec06d2e | 124 | }; |