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/* GNU/Linux/SH specific low level interface, for the remote server for GDB.
Copyright (C) 1995-2013 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);
#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;
}
static CORE_ADDR
sh_get_pc (struct regcache *regcache)
{
unsigned long pc;
collect_register_by_name (regcache, "pc", &pc);
return pc;
}
static void
sh_set_pc (struct regcache *regcache, CORE_ADDR pc)
{
unsigned long newpc = pc;
supply_register_by_name (regcache, "pc", &newpc);
}
/* Correct in either endianness, obviously. */
static const unsigned short sh_breakpoint = 0xc3c3;
#define sh_breakpoint_len 2
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;
}
/* 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]);
}
struct regset_info target_regsets[] = {
{ 0, 0, 0, 0, GENERAL_REGS, sh_fill_gregset, NULL },
{ 0, 0, 0, -1, -1, NULL, NULL }
};
struct linux_target_ops the_low_target = {
init_registers_sh,
sh_num_regs,
sh_regmap,
NULL,
sh_cannot_fetch_register,
sh_cannot_store_register,
NULL, /* fetch_register */
sh_get_pc,
sh_set_pc,
(const unsigned char *) &sh_breakpoint,
sh_breakpoint_len,
NULL,
0,
sh_breakpoint_at,
};
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