gdbserver/linux-low: turn 'get_thread_area' into a method
[deliverable/binutils-gdb.git] / gdbserver / linux-cris-low.cc
... / ...
CommitLineData
1/* GNU/Linux/CRIS specific low level interface, for the remote server for GDB.
2 Copyright (C) 1995-2020 Free Software Foundation, Inc.
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
8 the Free Software Foundation; either version 3 of the License, or
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
17 along with this program. If not, see <http://www.gnu.org/licenses/>. */
18
19#include "server.h"
20#include "linux-low.h"
21#include "nat/gdb_ptrace.h"
22
23/* Linux target op definitions for the CRIS architecture. */
24
25class cris_target : public linux_process_target
26{
27public:
28
29 const regs_info *get_regs_info () override;
30
31 const gdb_byte *sw_breakpoint_from_kind (int kind, int *size) override;
32
33protected:
34
35 void low_arch_setup () override;
36
37 bool low_cannot_fetch_register (int regno) override;
38
39 bool low_cannot_store_register (int regno) override;
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;
46
47 bool low_breakpoint_at (CORE_ADDR pc) override;
48};
49
50/* The singleton target ops object. */
51
52static cris_target the_cris_target;
53
54bool
55cris_target::low_supports_breakpoints ()
56{
57 return true;
58}
59
60CORE_ADDR
61cris_target::low_get_pc (regcache *regcache)
62{
63 return linux_get_pc_32bit (regcache);
64}
65
66void
67cris_target::low_set_pc (regcache *regcache, CORE_ADDR pc)
68{
69 linux_set_pc_32bit (regcache, pc);
70}
71
72/* Defined in auto-generated file reg-cris.c. */
73void init_registers_cris (void);
74extern const struct target_desc *tdesc_cris;
75
76/* CRISv10 */
77#define cris_num_regs 32
78
79/* Locations need to match <include/asm/arch/ptrace.h>. */
80static int cris_regmap[] = {
81 15*4, 14*4, 13*4, 12*4,
82 11*4, 10*4, 9*4, 8*4,
83 7*4, 6*4, 5*4, 4*4,
84 3*4, 2*4, 23*4, 19*4,
85
86 -1, -1, -1, -1,
87 -1, 17*4, -1, 16*4,
88 -1, -1, -1, 18*4,
89 -1, 17*4, -1, -1
90
91};
92
93bool
94cris_target::low_cannot_store_register (int regno)
95{
96 if (cris_regmap[regno] == -1)
97 return true;
98
99 return (regno >= cris_num_regs);
100}
101
102bool
103cris_target::low_cannot_fetch_register (int regno)
104{
105 if (cris_regmap[regno] == -1)
106 return true;
107
108 return (regno >= cris_num_regs);
109}
110
111static const unsigned short cris_breakpoint = 0xe938;
112#define cris_breakpoint_len 2
113
114/* Implementation of target ops method "sw_breakpoint_from_kind". */
115
116const gdb_byte *
117cris_target::sw_breakpoint_from_kind (int kind, int *size)
118{
119 *size = cris_breakpoint_len;
120 return (const gdb_byte *) &cris_breakpoint;
121}
122
123bool
124cris_target::low_breakpoint_at (CORE_ADDR where)
125{
126 unsigned short insn;
127
128 read_memory (where, (unsigned char *) &insn, cris_breakpoint_len);
129 if (insn == cris_breakpoint)
130 return true;
131
132 /* If necessary, recognize more trap instructions here. GDB only uses the
133 one. */
134 return false;
135}
136
137void
138cris_target::low_arch_setup ()
139{
140 current_process ()->tdesc = tdesc_cris;
141}
142
143static struct usrregs_info cris_usrregs_info =
144 {
145 cris_num_regs,
146 cris_regmap,
147 };
148
149static struct regs_info myregs_info =
150 {
151 NULL, /* regset_bitmap */
152 &cris_usrregs_info,
153 };
154
155const regs_info *
156cris_target::get_regs_info ()
157{
158 return &myregs_info;
159}
160
161struct linux_target_ops the_low_target = {
162};
163
164/* The linux target ops object. */
165
166linux_process_target *the_linux_target = &the_cris_target;
167
168void
169initialize_low_arch (void)
170{
171 init_registers_cris ();
172}
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