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 | ||
797bcff5 TBA |
29 | protected: |
30 | ||
31 | void low_arch_setup () override; | |
ef0478f6 TBA |
32 | }; |
33 | ||
34 | /* The singleton target ops object. */ | |
35 | ||
36 | static cris_target the_cris_target; | |
37 | ||
d05b4ac3 UW |
38 | /* Defined in auto-generated file reg-cris.c. */ |
39 | void init_registers_cris (void); | |
3aee8918 | 40 | extern const struct target_desc *tdesc_cris; |
d05b4ac3 | 41 | |
45b134e5 OF |
42 | /* CRISv10 */ |
43 | #define cris_num_regs 32 | |
44 | ||
45 | /* Locations need to match <include/asm/arch/ptrace.h>. */ | |
46 | static int cris_regmap[] = { | |
47 | 15*4, 14*4, 13*4, 12*4, | |
48 | 11*4, 10*4, 9*4, 8*4, | |
49 | 7*4, 6*4, 5*4, 4*4, | |
50 | 3*4, 2*4, 23*4, 19*4, | |
51 | ||
52 | -1, -1, -1, -1, | |
53 | -1, 17*4, -1, 16*4, | |
54 | -1, -1, -1, 18*4, | |
55 | -1, 17*4, -1, -1 | |
1b3f6016 | 56 | |
45b134e5 OF |
57 | }; |
58 | ||
59 | static int | |
60 | cris_cannot_store_register (int regno) | |
61 | { | |
62 | if (cris_regmap[regno] == -1) | |
63 | return 1; | |
1b3f6016 | 64 | |
45b134e5 OF |
65 | return (regno >= cris_num_regs); |
66 | } | |
67 | ||
68 | static int | |
69 | cris_cannot_fetch_register (int regno) | |
70 | { | |
71 | if (cris_regmap[regno] == -1) | |
72 | return 1; | |
73 | ||
74 | return (regno >= cris_num_regs); | |
75 | } | |
76 | ||
45b134e5 OF |
77 | static const unsigned short cris_breakpoint = 0xe938; |
78 | #define cris_breakpoint_len 2 | |
79 | ||
dd373349 AT |
80 | /* Implementation of linux_target_ops method "sw_breakpoint_from_kind". */ |
81 | ||
82 | static const gdb_byte * | |
83 | cris_sw_breakpoint_from_kind (int kind, int *size) | |
84 | { | |
85 | *size = cris_breakpoint_len; | |
86 | return (const gdb_byte *) &cris_breakpoint; | |
87 | } | |
88 | ||
45b134e5 OF |
89 | static int |
90 | cris_breakpoint_at (CORE_ADDR where) | |
91 | { | |
92 | unsigned short insn; | |
93 | ||
52405d85 TBA |
94 | the_target->read_memory (where, (unsigned char *) &insn, |
95 | cris_breakpoint_len); | |
45b134e5 OF |
96 | if (insn == cris_breakpoint) |
97 | return 1; | |
98 | ||
99 | /* If necessary, recognize more trap instructions here. GDB only uses the | |
100 | one. */ | |
101 | return 0; | |
102 | } | |
103 | ||
797bcff5 TBA |
104 | void |
105 | cris_target::low_arch_setup () | |
3aee8918 PA |
106 | { |
107 | current_process ()->tdesc = tdesc_cris; | |
108 | } | |
109 | ||
110 | static struct usrregs_info cris_usrregs_info = | |
111 | { | |
112 | cris_num_regs, | |
113 | cris_regmap, | |
114 | }; | |
115 | ||
116 | static struct regs_info regs_info = | |
117 | { | |
118 | NULL, /* regset_bitmap */ | |
119 | &cris_usrregs_info, | |
120 | }; | |
121 | ||
122 | static const struct regs_info * | |
123 | cris_regs_info (void) | |
124 | { | |
125 | return ®s_info; | |
126 | } | |
127 | ||
45b134e5 | 128 | struct linux_target_ops the_low_target = { |
3aee8918 | 129 | cris_regs_info, |
45b134e5 OF |
130 | cris_cannot_fetch_register, |
131 | cris_cannot_store_register, | |
c14dfd32 | 132 | NULL, /* fetch_register */ |
276d4552 YQ |
133 | linux_get_pc_32bit, |
134 | linux_set_pc_32bit, | |
dd373349 AT |
135 | NULL, /* breakpoint_kind_from_pc */ |
136 | cris_sw_breakpoint_from_kind, | |
fa5308bd | 137 | NULL, /* get_next_pcs */ |
45b134e5 OF |
138 | 0, |
139 | cris_breakpoint_at, | |
45b134e5 | 140 | }; |
3aee8918 | 141 | |
ef0478f6 TBA |
142 | /* The linux target ops object. */ |
143 | ||
144 | linux_process_target *the_linux_target = &the_cris_target; | |
145 | ||
3aee8918 PA |
146 | void |
147 | initialize_low_arch (void) | |
148 | { | |
149 | init_registers_cris (); | |
150 | } |