1 /* GNU/Linux/CRIS specific low level interface, for the remote server for GDB.
2 Copyright (C) 1995-2020 Free Software Foundation, Inc.
4 This file is part of GDB.
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.
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.
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/>. */
20 #include "linux-low.h"
21 #include "nat/gdb_ptrace.h"
23 /* Linux target op definitions for the CRIS architecture. */
25 class cris_target
: public linux_process_target
29 const regs_info
*get_regs_info () override
;
33 void low_arch_setup () override
;
36 /* The singleton target ops object. */
38 static cris_target the_cris_target
;
40 /* Defined in auto-generated file reg-cris.c. */
41 void init_registers_cris (void);
42 extern const struct target_desc
*tdesc_cris
;
45 #define cris_num_regs 32
47 /* Locations need to match <include/asm/arch/ptrace.h>. */
48 static int cris_regmap
[] = {
49 15*4, 14*4, 13*4, 12*4,
62 cris_cannot_store_register (int regno
)
64 if (cris_regmap
[regno
] == -1)
67 return (regno
>= cris_num_regs
);
71 cris_cannot_fetch_register (int regno
)
73 if (cris_regmap
[regno
] == -1)
76 return (regno
>= cris_num_regs
);
79 static const unsigned short cris_breakpoint
= 0xe938;
80 #define cris_breakpoint_len 2
82 /* Implementation of linux_target_ops method "sw_breakpoint_from_kind". */
84 static const gdb_byte
*
85 cris_sw_breakpoint_from_kind (int kind
, int *size
)
87 *size
= cris_breakpoint_len
;
88 return (const gdb_byte
*) &cris_breakpoint
;
92 cris_breakpoint_at (CORE_ADDR where
)
96 the_target
->read_memory (where
, (unsigned char *) &insn
,
98 if (insn
== cris_breakpoint
)
101 /* If necessary, recognize more trap instructions here. GDB only uses the
107 cris_target::low_arch_setup ()
109 current_process ()->tdesc
= tdesc_cris
;
112 static struct usrregs_info cris_usrregs_info
=
118 static struct regs_info myregs_info
=
120 NULL
, /* regset_bitmap */
125 cris_target::get_regs_info ()
130 struct linux_target_ops the_low_target
= {
131 cris_cannot_fetch_register
,
132 cris_cannot_store_register
,
133 NULL
, /* fetch_register */
136 NULL
, /* breakpoint_kind_from_pc */
137 cris_sw_breakpoint_from_kind
,
138 NULL
, /* get_next_pcs */
143 /* The linux target ops object. */
145 linux_process_target
*the_linux_target
= &the_cris_target
;
148 initialize_low_arch (void)
150 init_registers_cris ();