1 /* GNU/Linux/ARM specific low level interface, for the remote server for GDB.
2 Copyright 1995, 1996, 1998, 1999, 2000, 2001, 2002, 2003, 2004
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"
23 #include "linux-low.h"
24
25 #ifdef HAVE_SYS_REG_H
26 #include <sys/reg.h>
27 #endif
28
29 #define arm_num_regs 26
30
31 static int arm_regmap[] = {
32 0, 4, 8, 12, 16, 20, 24, 28,
33 32, 36, 40, 44, 48, 52, 56, 60,
34 -1, -1, -1, -1, -1, -1, -1, -1, -1,
35 64
36 };
37
38 static int
arm_cannot_store_register(int regno)39 arm_cannot_store_register (int regno)
40 {
41 return (regno >= arm_num_regs);
42 }
43
44 static int
arm_cannot_fetch_register(int regno)45 arm_cannot_fetch_register (int regno)
46 {
47 return (regno >= arm_num_regs);
48 }
49
50 extern int debug_threads;
51
52 static CORE_ADDR
arm_get_pc()53 arm_get_pc ()
54 {
55 unsigned long pc;
56 collect_register_by_name ("pc", &pc);
57 if (debug_threads)
58 fprintf (stderr, "stop pc is %08lx\n", pc);
59 return pc;
60 }
61
62 static void
arm_set_pc(CORE_ADDR pc)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
arm_breakpoint_at(CORE_ADDR where)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
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
arm_reinsert_addr()91 arm_reinsert_addr ()
92 {
93 unsigned long pc;
94 collect_register_by_name ("lr", &pc);
95 return pc;
96 }
97
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,
103 arm_get_pc,
104 arm_set_pc,
105 (const char *) &arm_breakpoint,
106 arm_breakpoint_len,
107 arm_reinsert_addr,
108 0,
109 arm_breakpoint_at,
110 };
111