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45b134e5 | 1 | /* GNU/Linux/CRIS specific low level interface, for the remote server for GDB. |
6aba47ca DJ |
2 | Copyright (C) 1995, 1996, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, |
3 | 2007 Free Software Foundation, Inc. | |
45b134e5 OF |
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. */ | |
45b134e5 OF |
21 | |
22 | #include "server.h" | |
23 | #include "linux-low.h" | |
24 | #include <sys/ptrace.h> | |
25 | ||
26 | /* CRISv10 */ | |
27 | #define cris_num_regs 32 | |
28 | ||
29 | /* Locations need to match <include/asm/arch/ptrace.h>. */ | |
30 | static int cris_regmap[] = { | |
31 | 15*4, 14*4, 13*4, 12*4, | |
32 | 11*4, 10*4, 9*4, 8*4, | |
33 | 7*4, 6*4, 5*4, 4*4, | |
34 | 3*4, 2*4, 23*4, 19*4, | |
35 | ||
36 | -1, -1, -1, -1, | |
37 | -1, 17*4, -1, 16*4, | |
38 | -1, -1, -1, 18*4, | |
39 | -1, 17*4, -1, -1 | |
40 | ||
41 | }; | |
42 | ||
43 | static int | |
44 | cris_cannot_store_register (int regno) | |
45 | { | |
46 | if (cris_regmap[regno] == -1) | |
47 | return 1; | |
48 | ||
49 | return (regno >= cris_num_regs); | |
50 | } | |
51 | ||
52 | static int | |
53 | cris_cannot_fetch_register (int regno) | |
54 | { | |
55 | if (cris_regmap[regno] == -1) | |
56 | return 1; | |
57 | ||
58 | return (regno >= cris_num_regs); | |
59 | } | |
60 | ||
61 | extern int debug_threads; | |
62 | ||
63 | static CORE_ADDR | |
64 | cris_get_pc (void) | |
65 | { | |
66 | unsigned long pc; | |
67 | collect_register_by_name ("pc", &pc); | |
68 | if (debug_threads) | |
69 | fprintf (stderr, "stop pc is %08lx\n", pc); | |
70 | return pc; | |
71 | } | |
72 | ||
73 | static void | |
74 | cris_set_pc (CORE_ADDR pc) | |
75 | { | |
76 | unsigned long newpc = pc; | |
77 | supply_register_by_name ("pc", &newpc); | |
78 | } | |
79 | ||
80 | static const unsigned short cris_breakpoint = 0xe938; | |
81 | #define cris_breakpoint_len 2 | |
82 | ||
83 | static int | |
84 | cris_breakpoint_at (CORE_ADDR where) | |
85 | { | |
86 | unsigned short insn; | |
87 | ||
f450004a DJ |
88 | (*the_target->read_memory) (where, (unsigned char *) &insn, |
89 | cris_breakpoint_len); | |
45b134e5 OF |
90 | if (insn == cris_breakpoint) |
91 | return 1; | |
92 | ||
93 | /* If necessary, recognize more trap instructions here. GDB only uses the | |
94 | one. */ | |
95 | return 0; | |
96 | } | |
97 | ||
98 | /* We only place breakpoints in empty marker functions, and thread locking | |
99 | is outside of the function. So rather than importing software single-step, | |
100 | we can just run until exit. */ | |
101 | static CORE_ADDR | |
102 | cris_reinsert_addr (void) | |
103 | { | |
104 | unsigned long pc; | |
105 | collect_register_by_name ("srp", &pc); | |
106 | return pc; | |
107 | } | |
108 | ||
109 | struct linux_target_ops the_low_target = { | |
110 | cris_num_regs, | |
111 | cris_regmap, | |
112 | cris_cannot_fetch_register, | |
113 | cris_cannot_store_register, | |
114 | cris_get_pc, | |
115 | cris_set_pc, | |
f450004a | 116 | (const unsigned char *) &cris_breakpoint, |
45b134e5 OF |
117 | cris_breakpoint_len, |
118 | cris_reinsert_addr, | |
119 | 0, | |
120 | cris_breakpoint_at, | |
121 | 0, | |
122 | 0, | |
123 | 0, | |
124 | 0, | |
125 | }; |