Commit | Line | Data |
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45b134e5 | 1 | /* GNU/Linux/CRIS specific low level interface, for the remote server for GDB. |
b811d2c2 | 2 | Copyright (C) 1995-2020 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 | |
ef0478f6 TBA |
23 | /* Linux target op definitions for the CRIS architecture. */ |
24 | ||
25 | class cris_target : public linux_process_target | |
26 | { | |
27 | public: | |
28 | ||
aa8d21c9 TBA |
29 | const regs_info *get_regs_info () override; |
30 | ||
3ca4edb6 TBA |
31 | const gdb_byte *sw_breakpoint_from_kind (int kind, int *size) override; |
32 | ||
797bcff5 TBA |
33 | protected: |
34 | ||
35 | void low_arch_setup () override; | |
daca57a7 TBA |
36 | |
37 | bool low_cannot_fetch_register (int regno) override; | |
38 | ||
39 | bool low_cannot_store_register (int regno) override; | |
bf9ae9d8 TBA |
40 | |
41 | bool low_supports_breakpoints () override; | |
42 | ||
43 | CORE_ADDR low_get_pc (regcache *regcache) override; | |
44 | ||
45 | void low_set_pc (regcache *regcache, CORE_ADDR newpc) override; | |
ef0478f6 TBA |
46 | }; |
47 | ||
48 | /* The singleton target ops object. */ | |
49 | ||
50 | static cris_target the_cris_target; | |
51 | ||
bf9ae9d8 TBA |
52 | bool |
53 | cris_target::low_supports_breakpoints () | |
54 | { | |
55 | return true; | |
56 | } | |
57 | ||
58 | CORE_ADDR | |
59 | cris_target::low_get_pc (regcache *regcache) | |
60 | { | |
61 | return linux_get_pc_32bit (regcache); | |
62 | } | |
63 | ||
64 | void | |
65 | cris_target::low_set_pc (regcache *regcache, CORE_ADDR pc) | |
66 | { | |
67 | linux_set_pc_32bit (regcache, pc); | |
68 | } | |
69 | ||
d05b4ac3 UW |
70 | /* Defined in auto-generated file reg-cris.c. */ |
71 | void init_registers_cris (void); | |
3aee8918 | 72 | extern const struct target_desc *tdesc_cris; |
d05b4ac3 | 73 | |
45b134e5 OF |
74 | /* CRISv10 */ |
75 | #define cris_num_regs 32 | |
76 | ||
77 | /* Locations need to match <include/asm/arch/ptrace.h>. */ | |
78 | static int cris_regmap[] = { | |
79 | 15*4, 14*4, 13*4, 12*4, | |
80 | 11*4, 10*4, 9*4, 8*4, | |
81 | 7*4, 6*4, 5*4, 4*4, | |
82 | 3*4, 2*4, 23*4, 19*4, | |
83 | ||
84 | -1, -1, -1, -1, | |
85 | -1, 17*4, -1, 16*4, | |
86 | -1, -1, -1, 18*4, | |
87 | -1, 17*4, -1, -1 | |
1b3f6016 | 88 | |
45b134e5 OF |
89 | }; |
90 | ||
daca57a7 TBA |
91 | bool |
92 | cris_target::low_cannot_store_register (int regno) | |
45b134e5 OF |
93 | { |
94 | if (cris_regmap[regno] == -1) | |
daca57a7 | 95 | return true; |
1b3f6016 | 96 | |
45b134e5 OF |
97 | return (regno >= cris_num_regs); |
98 | } | |
99 | ||
daca57a7 TBA |
100 | bool |
101 | cris_target::low_cannot_fetch_register (int regno) | |
45b134e5 OF |
102 | { |
103 | if (cris_regmap[regno] == -1) | |
daca57a7 | 104 | return true; |
45b134e5 OF |
105 | |
106 | return (regno >= cris_num_regs); | |
107 | } | |
108 | ||
45b134e5 OF |
109 | static const unsigned short cris_breakpoint = 0xe938; |
110 | #define cris_breakpoint_len 2 | |
111 | ||
3ca4edb6 | 112 | /* Implementation of target ops method "sw_breakpoint_from_kind". */ |
dd373349 | 113 | |
3ca4edb6 TBA |
114 | const gdb_byte * |
115 | cris_target::sw_breakpoint_from_kind (int kind, int *size) | |
dd373349 AT |
116 | { |
117 | *size = cris_breakpoint_len; | |
118 | return (const gdb_byte *) &cris_breakpoint; | |
119 | } | |
120 | ||
45b134e5 OF |
121 | static int |
122 | cris_breakpoint_at (CORE_ADDR where) | |
123 | { | |
124 | unsigned short insn; | |
125 | ||
52405d85 TBA |
126 | the_target->read_memory (where, (unsigned char *) &insn, |
127 | cris_breakpoint_len); | |
45b134e5 OF |
128 | if (insn == cris_breakpoint) |
129 | return 1; | |
130 | ||
131 | /* If necessary, recognize more trap instructions here. GDB only uses the | |
132 | one. */ | |
133 | return 0; | |
134 | } | |
135 | ||
797bcff5 TBA |
136 | void |
137 | cris_target::low_arch_setup () | |
3aee8918 PA |
138 | { |
139 | current_process ()->tdesc = tdesc_cris; | |
140 | } | |
141 | ||
142 | static struct usrregs_info cris_usrregs_info = | |
143 | { | |
144 | cris_num_regs, | |
145 | cris_regmap, | |
146 | }; | |
147 | ||
aa8d21c9 | 148 | static struct regs_info myregs_info = |
3aee8918 PA |
149 | { |
150 | NULL, /* regset_bitmap */ | |
151 | &cris_usrregs_info, | |
152 | }; | |
153 | ||
aa8d21c9 TBA |
154 | const regs_info * |
155 | cris_target::get_regs_info () | |
3aee8918 | 156 | { |
aa8d21c9 | 157 | return &myregs_info; |
3aee8918 PA |
158 | } |
159 | ||
45b134e5 | 160 | struct linux_target_ops the_low_target = { |
45b134e5 | 161 | cris_breakpoint_at, |
45b134e5 | 162 | }; |
3aee8918 | 163 | |
ef0478f6 TBA |
164 | /* The linux target ops object. */ |
165 | ||
166 | linux_process_target *the_linux_target = &the_cris_target; | |
167 | ||
3aee8918 PA |
168 | void |
169 | initialize_low_arch (void) | |
170 | { | |
171 | init_registers_cris (); | |
172 | } |