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linux-m32r-low.c
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1 /* GNU/Linux/m32r specific low level interface, for the remote server for GDB.
2 Copyright (C) 2005-2018 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
22 #ifdef HAVE_SYS_REG_H
23 #include <sys/reg.h>
24 #endif
25
26 /* Defined in auto-generated file reg-m32r.c. */
27 void init_registers_m32r (void);
28 extern const struct target_desc *tdesc_m32r;
29
30 #define m32r_num_regs 25
31
32 static int m32r_regmap[] = {
33 #ifdef PT_R0
34 PT_R0, PT_R1, PT_R2, PT_R3, PT_R4, PT_R5, PT_R6, PT_R7,
35 PT_R8, PT_R9, PT_R10, PT_R11, PT_R12, PT_FP, PT_LR, PT_SPU,
36 PT_PSW, PT_CBR, PT_SPI, PT_SPU, PT_BPC, PT_PC, PT_ACCL, PT_ACCH, PT_EVB
37 #else
38 4 * 4, 4 * 5, 4 * 6, 4 * 7, 4 * 0, 4 * 1, 4 * 2, 4 * 8,
39 4 * 9, 4 * 10, 4 * 11, 4 * 12, 4 * 13, 4 * 24, 4 * 25, 4 * 23,
40 4 * 19, 4 * 31, 4 * 26, 4 * 23, 4 * 20, 4 * 30, 4 * 16, 4 * 15, 4 * 32
41 #endif
42 };
43
44 static int
45 m32r_cannot_store_register (int regno)
46 {
47 return (regno >= m32r_num_regs);
48 }
49
50 static int
51 m32r_cannot_fetch_register (int regno)
52 {
53 return (regno >= m32r_num_regs);
54 }
55
56 static const unsigned short m32r_breakpoint = 0x10f1;
57 #define m32r_breakpoint_len 2
58
59 /* Implementation of linux_target_ops method "sw_breakpoint_from_kind". */
60
61 static const gdb_byte *
62 m32r_sw_breakpoint_from_kind (int kind, int *size)
63 {
64 *size = m32r_breakpoint_len;
65 return (const gdb_byte *) &m32r_breakpoint;
66 }
67
68 static int
69 m32r_breakpoint_at (CORE_ADDR where)
70 {
71 unsigned short insn;
72
73 (*the_target->read_memory) (where, (unsigned char *) &insn,
74 m32r_breakpoint_len);
75 if (insn == m32r_breakpoint)
76 return 1;
77
78 /* If necessary, recognize more trap instructions here. GDB only uses the
79 one. */
80 return 0;
81 }
82
83 static void
84 m32r_arch_setup (void)
85 {
86 current_process ()->tdesc = tdesc_m32r;
87 }
88
89 /* Support for hardware single step. */
90
91 static int
92 m32r_supports_hardware_single_step (void)
93 {
94 return 1;
95 }
96
97 static struct usrregs_info m32r_usrregs_info =
98 {
99 m32r_num_regs,
100 m32r_regmap,
101 };
102
103 static struct regs_info regs_info =
104 {
105 NULL, /* regset_bitmap */
106 &m32r_usrregs_info,
107 };
108
109 static const struct regs_info *
110 m32r_regs_info (void)
111 {
112 return &regs_info;
113 }
114
115 struct linux_target_ops the_low_target = {
116 m32r_arch_setup,
117 m32r_regs_info,
118 m32r_cannot_fetch_register,
119 m32r_cannot_store_register,
120 NULL, /* fetch_register */
121 linux_get_pc_32bit,
122 linux_set_pc_32bit,
123 NULL, /* breakpoint_from_pc */
124 m32r_sw_breakpoint_from_kind,
125 NULL,
126 0,
127 m32r_breakpoint_at,
128 NULL, /* supports_z_point_type */
129 NULL, /* insert_point */
130 NULL, /* remove_point */
131 NULL, /* stopped_by_watchpoint */
132 NULL, /* stopped_data_address */
133 NULL, /* collect_ptrace_register */
134 NULL, /* supply_ptrace_register */
135 NULL, /* siginfo_fixup */
136 NULL, /* new_process */
137 NULL, /* delete_process */
138 NULL, /* new_thread */
139 NULL, /* delete_thread */
140 NULL, /* new_fork */
141 NULL, /* prepare_to_resume */
142 NULL, /* process_qsupported */
143 NULL, /* supports_tracepoints */
144 NULL, /* get_thread_area */
145 NULL, /* install_fast_tracepoint_jump_pad */
146 NULL, /* emit_ops */
147 NULL, /* get_min_fast_tracepoint_insn_len */
148 NULL, /* supports_range_stepping */
149 NULL, /* breakpoint_kind_from_current_state */
150 m32r_supports_hardware_single_step,
151 };
152
153 void
154 initialize_low_arch (void)
155 {
156 init_registers_m32r ();
157 }
CORE_ADDR
bfd_vma CORE_ADDR
Definition: common-types.h:41
regs_info
static struct regs_info regs_info
Definition: linux-m32r-low.c:103
m32r_num_regs
#define m32r_num_regs
Definition: linux-m32r-low.c:30
linux_target_ops
Definition: linux-low.h:128
m32r_cannot_fetch_register
static int m32r_cannot_fetch_register(int regno)
Definition: linux-m32r-low.c:51
the_target
struct target_ops * the_target
Definition: target.c:24
process_info::tdesc
const struct target_desc * tdesc
Definition: inferiors.h:67
linux_get_pc_32bit
CORE_ADDR linux_get_pc_32bit(struct regcache *regcache)
Definition: linux-low.c:7411
m32r_supports_hardware_single_step
static int m32r_supports_hardware_single_step(void)
Definition: linux-m32r-low.c:92
linux-low.h
init_registers_m32r
void init_registers_m32r(void)
regs_info
Definition: linux-low.h:94
m32r_breakpoint
static const unsigned short m32r_breakpoint
Definition: linux-m32r-low.c:56
m32r_usrregs_info
static struct usrregs_info m32r_usrregs_info
Definition: linux-m32r-low.c:97
server.h
m32r_breakpoint_len
#define m32r_breakpoint_len
Definition: linux-m32r-low.c:57
current_process
struct process_info * current_process(void)
Definition: inferiors.c:210
usrregs_info
Definition: linux-low.h:83
m32r_regs_info
static const struct regs_info * m32r_regs_info(void)
Definition: linux-m32r-low.c:110
linux_set_pc_32bit
void linux_set_pc_32bit(struct regcache *regcache, CORE_ADDR pc)
Definition: linux-low.c:7400
gdb_byte
bfd_byte gdb_byte
Definition: common-types.h:38
m32r_sw_breakpoint_from_kind
static const gdb_byte * m32r_sw_breakpoint_from_kind(int kind, int *size)
Definition: linux-m32r-low.c:62
m32r_regmap
static int m32r_regmap[]
Definition: linux-m32r-low.c:32
tdesc_m32r
const struct target_desc * tdesc_m32r
target_desc
Definition: tdesc.h:33
target_ops::read_memory
int(* read_memory)(CORE_ADDR memaddr, unsigned char *myaddr, int len)
Definition: target.h:166
initialize_low_arch
void initialize_low_arch(void)
Definition: linux-m32r-low.c:154
the_low_target
struct linux_target_ops the_low_target
Definition: linux-m32r-low.c:115
m32r_cannot_store_register
static int m32r_cannot_store_register(int regno)
Definition: linux-m32r-low.c:45
m32r_arch_setup
static void m32r_arch_setup(void)
Definition: linux-m32r-low.c:84
m32r_breakpoint_at
static int m32r_breakpoint_at(CORE_ADDR where)
Definition: linux-m32r-low.c:69