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0a30fbc4 DJ |
1 | /* GNU/Linux/ARM specific low level interface, for the remote server for GDB. |
2 | Copyright 1995, 1996, 1998, 1999, 2000, 2001, 2002 | |
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 | ||
0d62e5e8 DJ |
50 | static CORE_ADDR |
51 | arm_get_pc () | |
52 | { | |
53 | unsigned long pc; | |
54 | collect_register_by_name ("pc", &pc); | |
55 | return pc; | |
56 | } | |
57 | ||
58 | static void | |
59 | arm_set_pc (CORE_ADDR pc) | |
60 | { | |
61 | unsigned long newpc = pc; | |
62 | supply_register_by_name ("pc", &newpc); | |
63 | } | |
64 | ||
65 | /* Correct in either endianness. We do not support Thumb yet. */ | |
66 | static const unsigned long arm_breakpoint = 0xef9f0001; | |
67 | #define arm_breakpoint_len 4 | |
68 | ||
69 | static int | |
70 | arm_breakpoint_at (CORE_ADDR where) | |
71 | { | |
72 | unsigned long insn; | |
73 | ||
74 | (*the_target->read_memory) (where, (char *) &insn, 4); | |
75 | if (insn == arm_breakpoint) | |
76 | return 1; | |
77 | ||
78 | /* If necessary, recognize more trap instructions here. GDB only uses the | |
79 | one. */ | |
80 | return 0; | |
81 | } | |
82 | ||
3b2fc2ea DJ |
83 | /* We only place breakpoints in empty marker functions, and thread locking |
84 | is outside of the function. So rather than importing software single-step, | |
85 | we can just run until exit. */ | |
86 | static CORE_ADDR | |
87 | arm_reinsert_addr () | |
88 | { | |
89 | unsigned long pc; | |
90 | collect_register_by_name ("lr", &pc); | |
91 | return pc; | |
92 | } | |
93 | ||
2ec06d2e DJ |
94 | struct linux_target_ops the_low_target = { |
95 | arm_num_regs, | |
96 | arm_regmap, | |
97 | arm_cannot_fetch_register, | |
98 | arm_cannot_store_register, | |
0d62e5e8 DJ |
99 | arm_get_pc, |
100 | arm_set_pc, | |
101 | (const char *) &arm_breakpoint, | |
102 | arm_breakpoint_len, | |
3b2fc2ea | 103 | arm_reinsert_addr, |
0d62e5e8 DJ |
104 | 0, |
105 | arm_breakpoint_at, | |
2ec06d2e | 106 | }; |