Commit | Line | Data |
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0a30fbc4 | 1 | /* GNU/Linux/ARM specific low level interface, for the remote server for GDB. |
d677d77d | 2 | Copyright 1995, 1996, 1998, 1999, 2000, 2001, 2002, 2003, 2004 |
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 | |
19 | Foundation, Inc., 59 Temple Place - Suite 330, | |
20 | Boston, MA 02111-1307, USA. */ | |
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 | ||
73 | static int | |
74 | arm_breakpoint_at (CORE_ADDR where) | |
75 | { | |
76 | unsigned long insn; | |
77 | ||
78 | (*the_target->read_memory) (where, (char *) &insn, 4); | |
79 | if (insn == arm_breakpoint) | |
80 | return 1; | |
81 | ||
82 | /* If necessary, recognize more trap instructions here. GDB only uses the | |
83 | one. */ | |
84 | return 0; | |
85 | } | |
86 | ||
3b2fc2ea DJ |
87 | /* We only place breakpoints in empty marker functions, and thread locking |
88 | is outside of the function. So rather than importing software single-step, | |
89 | we can just run until exit. */ | |
90 | static CORE_ADDR | |
91 | arm_reinsert_addr () | |
92 | { | |
93 | unsigned long pc; | |
94 | collect_register_by_name ("lr", &pc); | |
95 | return pc; | |
96 | } | |
97 | ||
2ec06d2e DJ |
98 | struct linux_target_ops the_low_target = { |
99 | arm_num_regs, | |
100 | arm_regmap, | |
101 | arm_cannot_fetch_register, | |
102 | arm_cannot_store_register, | |
0d62e5e8 DJ |
103 | arm_get_pc, |
104 | arm_set_pc, | |
105 | (const char *) &arm_breakpoint, | |
106 | arm_breakpoint_len, | |
3b2fc2ea | 107 | arm_reinsert_addr, |
0d62e5e8 DJ |
108 | 0, |
109 | arm_breakpoint_at, | |
2ec06d2e | 110 | }; |