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/* GNU/Linux/SH 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"
/* Linux target op definitions for the SH architecture. */
class sh_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 sh_target the_sh_target;
/* Defined in auto-generated file reg-sh.c. */
void init_registers_sh (void);
extern const struct target_desc *tdesc_sh;
#ifdef HAVE_SYS_REG_H
#include <sys/reg.h>
#endif
#include <asm/ptrace.h>
#define sh_num_regs 41
/* Currently, don't check/send MQ. */
static int sh_regmap[] = {
0, 4, 8, 12, 16, 20, 24, 28,
32, 36, 40, 44, 48, 52, 56, 60,
REG_PC*4, REG_PR*4, REG_GBR*4, -1,
REG_MACH*4, REG_MACL*4, REG_SR*4,
REG_FPUL*4, REG_FPSCR*4,
REG_FPREG0*4+0, REG_FPREG0*4+4, REG_FPREG0*4+8, REG_FPREG0*4+12,
REG_FPREG0*4+16, REG_FPREG0*4+20, REG_FPREG0*4+24, REG_FPREG0*4+28,
REG_FPREG0*4+32, REG_FPREG0*4+36, REG_FPREG0*4+40, REG_FPREG0*4+44,
REG_FPREG0*4+48, REG_FPREG0*4+52, REG_FPREG0*4+56, REG_FPREG0*4+60,
};
bool
sh_target::low_cannot_store_register (int regno)
{
return false;
}
bool
sh_target::low_cannot_fetch_register (int regno)
{
return false;
}
/* Correct in either endianness, obviously. */
static const unsigned short sh_breakpoint = 0xc3c3;
#define sh_breakpoint_len 2
/* Implementation of linux_target_ops method "sw_breakpoint_from_kind". */
static const gdb_byte *
sh_sw_breakpoint_from_kind (int kind, int *size)
{
*size = sh_breakpoint_len;
return (const gdb_byte *) &sh_breakpoint;
}
static int
sh_breakpoint_at (CORE_ADDR where)
{
unsigned short insn;
the_target->read_memory (where, (unsigned char *) &insn, 2);
if (insn == sh_breakpoint)
return 1;
/* If necessary, recognize more trap instructions here. GDB only uses the
one. */
return 0;
}
/* Support for hardware single step. */
static int
sh_supports_hardware_single_step (void)
{
return 1;
}
/* Provide only a fill function for the general register set. ps_lgetregs
will use this for NPTL support. */
static void sh_fill_gregset (struct regcache *regcache, void *buf)
{
int i;
for (i = 0; i < 23; i++)
if (sh_regmap[i] != -1)
collect_register (regcache, i, (char *) buf + sh_regmap[i]);
}
static struct regset_info sh_regsets[] = {
{ 0, 0, 0, 0, GENERAL_REGS, sh_fill_gregset, NULL },
NULL_REGSET
};
static struct regsets_info sh_regsets_info =
{
sh_regsets, /* regsets */
0, /* num_regsets */
NULL, /* disabled_regsets */
};
static struct usrregs_info sh_usrregs_info =
{
sh_num_regs,
sh_regmap,
};
static struct regs_info myregs_info =
{
NULL, /* regset_bitmap */
&sh_usrregs_info,
&sh_regsets_info
};
const regs_info *
sh_target::get_regs_info ()
{
return &myregs_info;
}
void
sh_target::low_arch_setup ()
{
current_process ()->tdesc = tdesc_sh;
}
struct linux_target_ops the_low_target = {
linux_get_pc_32bit,
linux_set_pc_32bit,
NULL, /* breakpoint_kind_from_pc */
sh_sw_breakpoint_from_kind,
NULL,
0,
sh_breakpoint_at,
NULL, /* supports_z_point_type */
NULL, /* insert_point */
NULL, /* remove_point */
NULL, /* stopped_by_watchpoint */
NULL, /* stopped_data_address */
NULL, /* collect_ptrace_register */
NULL, /* supply_ptrace_register */
NULL, /* siginfo_fixup */
NULL, /* new_process */
NULL, /* delete_process */
NULL, /* new_thread */
NULL, /* delete_thread */
NULL, /* new_fork */
NULL, /* prepare_to_resume */
NULL, /* process_qsupported */
NULL, /* supports_tracepoints */
NULL, /* get_thread_area */
NULL, /* install_fast_tracepoint_jump_pad */
NULL, /* emit_ops */
NULL, /* get_min_fast_tracepoint_insn_len */
NULL, /* supports_range_stepping */
NULL, /* breakpoint_kind_from_current_state */
sh_supports_hardware_single_step,
};
/* The linux target ops object. */
linux_process_target *the_linux_target = &the_sh_target;
void
initialize_low_arch (void)
{
init_registers_sh ();
initialize_regsets_info (&sh_regsets_info);
}
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