Commit | Line | Data |
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45b134e5 | 1 | /* GNU/Linux/CRIS specific low level interface, for the remote server for GDB. |
32d0add0 | 2 | Copyright (C) 1995-2015 Free Software Foundation, Inc. |
45b134e5 OF |
3 | |
4 | This file is part of GDB. | |
5 | ||
6 | This program is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 8 | the Free Software Foundation; either version 3 of the License, or |
45b134e5 OF |
9 | (at your option) any later version. |
10 | ||
11 | This program is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
a9762ec7 | 17 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
45b134e5 OF |
18 | |
19 | #include "server.h" | |
20 | #include "linux-low.h" | |
5826e159 | 21 | #include "nat/gdb_ptrace.h" |
45b134e5 | 22 | |
d05b4ac3 UW |
23 | /* Defined in auto-generated file reg-cris.c. */ |
24 | void init_registers_cris (void); | |
3aee8918 | 25 | extern const struct target_desc *tdesc_cris; |
d05b4ac3 | 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 | 69 | if (debug_threads) |
87ce2a04 | 70 | debug_printf ("stop pc is %08lx\n", pc); |
45b134e5 OF |
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 | { | |
0bfdf32f | 105 | struct regcache *regcache = get_thread_regcache (current_thread, 1); |
45b134e5 | 106 | unsigned long pc; |
442ea881 | 107 | collect_register_by_name (regcache, "srp", &pc); |
45b134e5 OF |
108 | return pc; |
109 | } | |
110 | ||
3aee8918 PA |
111 | static void |
112 | cris_arch_setup (void) | |
113 | { | |
114 | current_process ()->tdesc = tdesc_cris; | |
115 | } | |
116 | ||
117 | static struct usrregs_info cris_usrregs_info = | |
118 | { | |
119 | cris_num_regs, | |
120 | cris_regmap, | |
121 | }; | |
122 | ||
123 | static struct regs_info regs_info = | |
124 | { | |
125 | NULL, /* regset_bitmap */ | |
126 | &cris_usrregs_info, | |
127 | }; | |
128 | ||
129 | static const struct regs_info * | |
130 | cris_regs_info (void) | |
131 | { | |
132 | return ®s_info; | |
133 | } | |
134 | ||
45b134e5 | 135 | struct linux_target_ops the_low_target = { |
3aee8918 PA |
136 | cris_arch_setup, |
137 | cris_regs_info, | |
45b134e5 OF |
138 | cris_cannot_fetch_register, |
139 | cris_cannot_store_register, | |
c14dfd32 | 140 | NULL, /* fetch_register */ |
45b134e5 OF |
141 | cris_get_pc, |
142 | cris_set_pc, | |
f450004a | 143 | (const unsigned char *) &cris_breakpoint, |
45b134e5 OF |
144 | cris_breakpoint_len, |
145 | cris_reinsert_addr, | |
146 | 0, | |
147 | cris_breakpoint_at, | |
148 | 0, | |
149 | 0, | |
150 | 0, | |
151 | 0, | |
152 | }; | |
3aee8918 PA |
153 | |
154 | void | |
155 | initialize_low_arch (void) | |
156 | { | |
157 | init_registers_cris (); | |
158 | } |