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
;
35 bool low_cannot_fetch_register (int regno
) override
;
37 bool low_cannot_store_register (int regno
) override
;
40 /* The singleton target ops object. */
42 static cris_target the_cris_target
;
44 /* Defined in auto-generated file reg-cris.c. */
45 void init_registers_cris (void);
46 extern const struct target_desc
*tdesc_cris
;
49 #define cris_num_regs 32
51 /* Locations need to match <include/asm/arch/ptrace.h>. */
52 static int cris_regmap
[] = {
53 15*4, 14*4, 13*4, 12*4,
66 cris_target::low_cannot_store_register (int regno
)
68 if (cris_regmap
[regno
] == -1)
71 return (regno
>= cris_num_regs
);
75 cris_target::low_cannot_fetch_register (int regno
)
77 if (cris_regmap
[regno
] == -1)
80 return (regno
>= cris_num_regs
);
83 static const unsigned short cris_breakpoint
= 0xe938;
84 #define cris_breakpoint_len 2
86 /* Implementation of linux_target_ops method "sw_breakpoint_from_kind". */
88 static const gdb_byte
*
89 cris_sw_breakpoint_from_kind (int kind
, int *size
)
91 *size
= cris_breakpoint_len
;
92 return (const gdb_byte
*) &cris_breakpoint
;
96 cris_breakpoint_at (CORE_ADDR where
)
100 the_target
->read_memory (where
, (unsigned char *) &insn
,
101 cris_breakpoint_len
);
102 if (insn
== cris_breakpoint
)
105 /* If necessary, recognize more trap instructions here. GDB only uses the
111 cris_target::low_arch_setup ()
113 current_process ()->tdesc
= tdesc_cris
;
116 static struct usrregs_info cris_usrregs_info
=
122 static struct regs_info myregs_info
=
124 NULL
, /* regset_bitmap */
129 cris_target::get_regs_info ()
134 struct linux_target_ops the_low_target
= {
135 NULL
, /* fetch_register */
138 NULL
, /* breakpoint_kind_from_pc */
139 cris_sw_breakpoint_from_kind
,
140 NULL
, /* get_next_pcs */
145 /* The linux target ops object. */
147 linux_process_target
*the_linux_target
= &the_cris_target
;
150 initialize_low_arch (void)
152 init_registers_cris ();