GDBserver

linux-cris-low.c
Go to the documentation of this file.
1 /* GNU/Linux/CRIS specific low level interface, for the remote server for GDB.
2 Copyright (C) 1995-2018 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 #include "nat/gdb_ptrace.h"
22
23 /* Defined in auto-generated file reg-cris.c. */
24 void init_registers_cris (void);
25 extern const struct target_desc *tdesc_cris;
26
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
41
42 };
43
44 static int
45 cris_cannot_store_register (int regno)
46 {
47 if (cris_regmap[regno] == -1)
48 return 1;
49
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 static const unsigned short cris_breakpoint = 0xe938;
63 #define cris_breakpoint_len 2
64
65 /* Implementation of linux_target_ops method "sw_breakpoint_from_kind". */
66
67 static const gdb_byte *
68 cris_sw_breakpoint_from_kind (int kind, int *size)
69 {
70 *size = cris_breakpoint_len;
71 return (const gdb_byte *) &cris_breakpoint;
72 }
73
74 static int
75 cris_breakpoint_at (CORE_ADDR where)
76 {
77 unsigned short insn;
78
79 (*the_target->read_memory) (where, (unsigned char *) &insn,
80 cris_breakpoint_len);
81 if (insn == cris_breakpoint)
82 return 1;
83
84 /* If necessary, recognize more trap instructions here. GDB only uses the
85 one. */
86 return 0;
87 }
88
89 static void
90 cris_arch_setup (void)
91 {
92 current_process ()->tdesc = tdesc_cris;
93 }
94
95 static struct usrregs_info cris_usrregs_info =
96 {
97 cris_num_regs,
98 cris_regmap,
99 };
100
101 static struct regs_info regs_info =
102 {
103 NULL, /* regset_bitmap */
104 &cris_usrregs_info,
105 };
106
107 static const struct regs_info *
108 cris_regs_info (void)
109 {
110 return &regs_info;
111 }
112
113 struct linux_target_ops the_low_target = {
114 cris_arch_setup,
115 cris_regs_info,
116 cris_cannot_fetch_register,
117 cris_cannot_store_register,
118 NULL, /* fetch_register */
119 linux_get_pc_32bit,
120 linux_set_pc_32bit,
121 NULL, /* breakpoint_kind_from_pc */
122 cris_sw_breakpoint_from_kind,
123 NULL, /* get_next_pcs */
124 0,
125 cris_breakpoint_at,
126 };
127
128 void
129 initialize_low_arch (void)
130 {
131 init_registers_cris ();
132 }
cris_breakpoint_len
#define cris_breakpoint_len
Definition: linux-cris-low.c:63
CORE_ADDR
bfd_vma CORE_ADDR
Definition: common-types.h:41
cris_breakpoint_at
static int cris_breakpoint_at(CORE_ADDR where)
Definition: linux-cris-low.c:75
initialize_low_arch
void initialize_low_arch(void)
Definition: linux-cris-low.c:129
cris_sw_breakpoint_from_kind
static const gdb_byte * cris_sw_breakpoint_from_kind(int kind, int *size)
Definition: linux-cris-low.c:68
cris_breakpoint
static const unsigned short cris_breakpoint
Definition: linux-cris-low.c:62
linux_target_ops
Definition: linux-low.h:128
the_low_target
struct linux_target_ops the_low_target
Definition: linux-cris-low.c:113
cris_cannot_store_register
static int cris_cannot_store_register(int regno)
Definition: linux-cris-low.c:45
cris_usrregs_info
static struct usrregs_info cris_usrregs_info
Definition: linux-cris-low.c:95
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
linux-low.h
cris_cannot_fetch_register
static int cris_cannot_fetch_register(int regno)
Definition: linux-cris-low.c:54
regs_info
Definition: linux-low.h:94
init_registers_cris
void init_registers_cris(void)
server.h
cris_num_regs
#define cris_num_regs
Definition: linux-cris-low.c:28
current_process
struct process_info * current_process(void)
Definition: inferiors.c:210
usrregs_info
Definition: linux-low.h:83
regs_info
static struct regs_info regs_info
Definition: linux-cris-low.c:101
linux_set_pc_32bit
void linux_set_pc_32bit(struct regcache *regcache, CORE_ADDR pc)
Definition: linux-low.c:7400
tdesc_cris
const struct target_desc * tdesc_cris
gdb_byte
bfd_byte gdb_byte
Definition: common-types.h:38
cris_regmap
static int cris_regmap[]
Definition: linux-cris-low.c:31
target_desc
Definition: tdesc.h:33
cris_regs_info
static const struct regs_info * cris_regs_info(void)
Definition: linux-cris-low.c:108
target_ops::read_memory
int(* read_memory)(CORE_ADDR memaddr, unsigned char *myaddr, int len)
Definition: target.h:166
gdb_ptrace.h
cris_arch_setup
static void cris_arch_setup(void)
Definition: linux-cris-low.c:90