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/* GNU/Linux/CRIS specific low level interface, for the remote server for GDB.
Copyright (C) 1995-2020 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "server.h"
#include "linux-low.h"
#include "nat/gdb_ptrace.h"
/* Linux target op definitions for the CRIS architecture. */
class cris_target : public linux_process_target
{
public:
const regs_info *get_regs_info () override;
protected:
void low_arch_setup () override;
bool low_cannot_fetch_register (int regno) override;
bool low_cannot_store_register (int regno) override;
};
/* The singleton target ops object. */
static cris_target the_cris_target;
/* Defined in auto-generated file reg-cris.c. */
void init_registers_cris (void);
extern const struct target_desc *tdesc_cris;
/* CRISv10 */
#define cris_num_regs 32
/* Locations need to match <include/asm/arch/ptrace.h>. */
static int cris_regmap[] = {
15*4, 14*4, 13*4, 12*4,
11*4, 10*4, 9*4, 8*4,
7*4, 6*4, 5*4, 4*4,
3*4, 2*4, 23*4, 19*4,
-1, -1, -1, -1,
-1, 17*4, -1, 16*4,
-1, -1, -1, 18*4,
-1, 17*4, -1, -1
};
bool
cris_target::low_cannot_store_register (int regno)
{
if (cris_regmap[regno] == -1)
return true;
return (regno >= cris_num_regs);
}
bool
cris_target::low_cannot_fetch_register (int regno)
{
if (cris_regmap[regno] == -1)
return true;
return (regno >= cris_num_regs);
}
static const unsigned short cris_breakpoint = 0xe938;
#define cris_breakpoint_len 2
/* Implementation of linux_target_ops method "sw_breakpoint_from_kind". */
static const gdb_byte *
cris_sw_breakpoint_from_kind (int kind, int *size)
{
*size = cris_breakpoint_len;
return (const gdb_byte *) &cris_breakpoint;
}
static int
cris_breakpoint_at (CORE_ADDR where)
{
unsigned short insn;
the_target->read_memory (where, (unsigned char *) &insn,
cris_breakpoint_len);
if (insn == cris_breakpoint)
return 1;
/* If necessary, recognize more trap instructions here. GDB only uses the
one. */
return 0;
}
void
cris_target::low_arch_setup ()
{
current_process ()->tdesc = tdesc_cris;
}
static struct usrregs_info cris_usrregs_info =
{
cris_num_regs,
cris_regmap,
};
static struct regs_info myregs_info =
{
NULL, /* regset_bitmap */
&cris_usrregs_info,
};
const regs_info *
cris_target::get_regs_info ()
{
return &myregs_info;
}
struct linux_target_ops the_low_target = {
linux_get_pc_32bit,
linux_set_pc_32bit,
NULL, /* breakpoint_kind_from_pc */
cris_sw_breakpoint_from_kind,
NULL, /* get_next_pcs */
0,
cris_breakpoint_at,
};
/* The linux target ops object. */
linux_process_target *the_linux_target = &the_cris_target;
void
initialize_low_arch (void)
{
init_registers_cris ();
}
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