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45b134e5 | 1 | /* GNU/Linux/CRIS specific low level interface, for the remote server for GDB. |
0b302171 JB |
2 | Copyright (C) 1995-1996, 1998-2005, 2007-2012 Free Software |
3 | 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 | |
a9762ec7 | 9 | the Free Software Foundation; either version 3 of the License, or |
45b134e5 OF |
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 | |
a9762ec7 | 18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
45b134e5 OF |
19 | |
20 | #include "server.h" | |
21 | #include "linux-low.h" | |
22 | #include <sys/ptrace.h> | |
23 | ||
d05b4ac3 UW |
24 | /* Defined in auto-generated file reg-cris.c. */ |
25 | void init_registers_cris (void); | |
26 | ||
45b134e5 OF |
27 | /* CRISv10 */ |
28 | #define cris_num_regs 32 | |
29 | ||
30 | /* Locations need to match <include/asm/arch/ptrace.h>. */ | |
31 | static int cris_regmap[] = { | |
32 | 15*4, 14*4, 13*4, 12*4, | |
33 | 11*4, 10*4, 9*4, 8*4, | |
34 | 7*4, 6*4, 5*4, 4*4, | |
35 | 3*4, 2*4, 23*4, 19*4, | |
36 | ||
37 | -1, -1, -1, -1, | |
38 | -1, 17*4, -1, 16*4, | |
39 | -1, -1, -1, 18*4, | |
40 | -1, 17*4, -1, -1 | |
1b3f6016 | 41 | |
45b134e5 OF |
42 | }; |
43 | ||
44 | static int | |
45 | cris_cannot_store_register (int regno) | |
46 | { | |
47 | if (cris_regmap[regno] == -1) | |
48 | return 1; | |
1b3f6016 | 49 | |
45b134e5 OF |
50 | return (regno >= cris_num_regs); |
51 | } | |
52 | ||
53 | static int | |
54 | cris_cannot_fetch_register (int regno) | |
55 | { | |
56 | if (cris_regmap[regno] == -1) | |
57 | return 1; | |
58 | ||
59 | return (regno >= cris_num_regs); | |
60 | } | |
61 | ||
62 | extern int debug_threads; | |
63 | ||
64 | static CORE_ADDR | |
442ea881 | 65 | cris_get_pc (struct regcache *regcache, void) |
45b134e5 OF |
66 | { |
67 | unsigned long pc; | |
442ea881 | 68 | collect_register_by_name (regcache, "pc", &pc); |
45b134e5 OF |
69 | if (debug_threads) |
70 | fprintf (stderr, "stop pc is %08lx\n", pc); | |
71 | return pc; | |
72 | } | |
73 | ||
74 | static void | |
442ea881 | 75 | cris_set_pc (struct regcache *regcache, CORE_ADDR pc) |
45b134e5 OF |
76 | { |
77 | unsigned long newpc = pc; | |
442ea881 | 78 | supply_register_by_name (regcache, "pc", &newpc); |
45b134e5 OF |
79 | } |
80 | ||
81 | static const unsigned short cris_breakpoint = 0xe938; | |
82 | #define cris_breakpoint_len 2 | |
83 | ||
84 | static int | |
85 | cris_breakpoint_at (CORE_ADDR where) | |
86 | { | |
87 | unsigned short insn; | |
88 | ||
f450004a DJ |
89 | (*the_target->read_memory) (where, (unsigned char *) &insn, |
90 | cris_breakpoint_len); | |
45b134e5 OF |
91 | if (insn == cris_breakpoint) |
92 | return 1; | |
93 | ||
94 | /* If necessary, recognize more trap instructions here. GDB only uses the | |
95 | one. */ | |
96 | return 0; | |
97 | } | |
98 | ||
99 | /* We only place breakpoints in empty marker functions, and thread locking | |
100 | is outside of the function. So rather than importing software single-step, | |
101 | we can just run until exit. */ | |
102 | static CORE_ADDR | |
103 | cris_reinsert_addr (void) | |
104 | { | |
442ea881 | 105 | struct regcache *regcache = get_thread_regcache (current_inferior, 1); |
45b134e5 | 106 | unsigned long pc; |
442ea881 | 107 | collect_register_by_name (regcache, "srp", &pc); |
45b134e5 OF |
108 | return pc; |
109 | } | |
110 | ||
111 | struct linux_target_ops the_low_target = { | |
d05b4ac3 | 112 | init_registers_cris, |
45b134e5 OF |
113 | cris_num_regs, |
114 | cris_regmap, | |
1faeff08 | 115 | NULL, |
45b134e5 OF |
116 | cris_cannot_fetch_register, |
117 | cris_cannot_store_register, | |
c14dfd32 | 118 | NULL, /* fetch_register */ |
45b134e5 OF |
119 | cris_get_pc, |
120 | cris_set_pc, | |
f450004a | 121 | (const unsigned char *) &cris_breakpoint, |
45b134e5 OF |
122 | cris_breakpoint_len, |
123 | cris_reinsert_addr, | |
124 | 0, | |
125 | cris_breakpoint_at, | |
126 | 0, | |
127 | 0, | |
128 | 0, | |
129 | 0, | |
130 | }; |