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
;
39 bool low_supports_breakpoints () override
;
41 CORE_ADDR
low_get_pc (regcache
*regcache
) override
;
43 void low_set_pc (regcache
*regcache
, CORE_ADDR newpc
) override
;
46 /* The singleton target ops object. */
48 static cris_target the_cris_target
;
51 cris_target::low_supports_breakpoints ()
57 cris_target::low_get_pc (regcache
*regcache
)
59 return linux_get_pc_32bit (regcache
);
63 cris_target::low_set_pc (regcache
*regcache
, CORE_ADDR pc
)
65 linux_set_pc_32bit (regcache
, pc
);
68 /* Defined in auto-generated file reg-cris.c. */
69 void init_registers_cris (void);
70 extern const struct target_desc
*tdesc_cris
;
73 #define cris_num_regs 32
75 /* Locations need to match <include/asm/arch/ptrace.h>. */
76 static int cris_regmap
[] = {
77 15*4, 14*4, 13*4, 12*4,
90 cris_target::low_cannot_store_register (int regno
)
92 if (cris_regmap
[regno
] == -1)
95 return (regno
>= cris_num_regs
);
99 cris_target::low_cannot_fetch_register (int regno
)
101 if (cris_regmap
[regno
] == -1)
104 return (regno
>= cris_num_regs
);
107 static const unsigned short cris_breakpoint
= 0xe938;
108 #define cris_breakpoint_len 2
110 /* Implementation of linux_target_ops method "sw_breakpoint_from_kind". */
112 static const gdb_byte
*
113 cris_sw_breakpoint_from_kind (int kind
, int *size
)
115 *size
= cris_breakpoint_len
;
116 return (const gdb_byte
*) &cris_breakpoint
;
120 cris_breakpoint_at (CORE_ADDR where
)
124 the_target
->read_memory (where
, (unsigned char *) &insn
,
125 cris_breakpoint_len
);
126 if (insn
== cris_breakpoint
)
129 /* If necessary, recognize more trap instructions here. GDB only uses the
135 cris_target::low_arch_setup ()
137 current_process ()->tdesc
= tdesc_cris
;
140 static struct usrregs_info cris_usrregs_info
=
146 static struct regs_info myregs_info
=
148 NULL
, /* regset_bitmap */
153 cris_target::get_regs_info ()
158 struct linux_target_ops the_low_target
= {
159 cris_sw_breakpoint_from_kind
,
160 NULL
, /* get_next_pcs */
165 /* The linux target ops object. */
167 linux_process_target
*the_linux_target
= &the_cris_target
;
170 initialize_low_arch (void)
172 init_registers_cris ();