/* GNU/Linux/SH specific low level interface, for the remote server for GDB.

Copyright (C) 1995-2016 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"

/* 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,

};

static int

sh_cannot_store_register (int regno)

{

return 0;

}

static int

sh_cannot_fetch_register (int regno)

{

return 0;

}

/* 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 regs_info =

{

NULL, /* regset_bitmap */

&sh_usrregs_info,

&sh_regsets_info

};

static const struct regs_info *

sh_regs_info (void)

{

return &regs_info;

}

static void

sh_arch_setup (void)

{

current_process ()->tdesc = tdesc_sh;

}

struct linux_target_ops the_low_target = {

sh_arch_setup,

sh_regs_info,

sh_cannot_fetch_register,

sh_cannot_store_register,

NULL, /* fetch_register */

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, /* new_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,

};

void

initialize_low_arch (void)

{

init_registers_sh ();

initialize_regsets_info (&sh_regsets_info);

}