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188 lines
4.4 KiB
C
188 lines
4.4 KiB
C
/* GNU/Linux/SH specific low level interface, for the remote server for GDB.
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Copyright (C) 1995-2017 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "server.h"
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#include "linux-low.h"
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/* Defined in auto-generated file reg-sh.c. */
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void init_registers_sh (void);
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extern const struct target_desc *tdesc_sh;
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#ifdef HAVE_SYS_REG_H
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#include <sys/reg.h>
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#endif
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#include <asm/ptrace.h>
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#define sh_num_regs 41
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/* Currently, don't check/send MQ. */
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static int sh_regmap[] = {
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0, 4, 8, 12, 16, 20, 24, 28,
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32, 36, 40, 44, 48, 52, 56, 60,
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REG_PC*4, REG_PR*4, REG_GBR*4, -1,
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REG_MACH*4, REG_MACL*4, REG_SR*4,
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REG_FPUL*4, REG_FPSCR*4,
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REG_FPREG0*4+0, REG_FPREG0*4+4, REG_FPREG0*4+8, REG_FPREG0*4+12,
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REG_FPREG0*4+16, REG_FPREG0*4+20, REG_FPREG0*4+24, REG_FPREG0*4+28,
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REG_FPREG0*4+32, REG_FPREG0*4+36, REG_FPREG0*4+40, REG_FPREG0*4+44,
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REG_FPREG0*4+48, REG_FPREG0*4+52, REG_FPREG0*4+56, REG_FPREG0*4+60,
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};
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static int
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sh_cannot_store_register (int regno)
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{
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return 0;
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}
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static int
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sh_cannot_fetch_register (int regno)
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{
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return 0;
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}
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/* Correct in either endianness, obviously. */
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static const unsigned short sh_breakpoint = 0xc3c3;
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#define sh_breakpoint_len 2
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/* Implementation of linux_target_ops method "sw_breakpoint_from_kind". */
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static const gdb_byte *
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sh_sw_breakpoint_from_kind (int kind, int *size)
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{
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*size = sh_breakpoint_len;
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return (const gdb_byte *) &sh_breakpoint;
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}
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static int
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sh_breakpoint_at (CORE_ADDR where)
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{
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unsigned short insn;
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(*the_target->read_memory) (where, (unsigned char *) &insn, 2);
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if (insn == sh_breakpoint)
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return 1;
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/* If necessary, recognize more trap instructions here. GDB only uses the
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one. */
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return 0;
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}
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/* Support for hardware single step. */
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static int
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sh_supports_hardware_single_step (void)
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{
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return 1;
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}
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/* Provide only a fill function for the general register set. ps_lgetregs
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will use this for NPTL support. */
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static void sh_fill_gregset (struct regcache *regcache, void *buf)
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{
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int i;
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for (i = 0; i < 23; i++)
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if (sh_regmap[i] != -1)
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collect_register (regcache, i, (char *) buf + sh_regmap[i]);
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}
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static struct regset_info sh_regsets[] = {
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{ 0, 0, 0, 0, GENERAL_REGS, sh_fill_gregset, NULL },
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NULL_REGSET
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};
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static struct regsets_info sh_regsets_info =
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{
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sh_regsets, /* regsets */
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0, /* num_regsets */
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NULL, /* disabled_regsets */
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};
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static struct usrregs_info sh_usrregs_info =
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{
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sh_num_regs,
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sh_regmap,
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};
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static struct regs_info regs_info =
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{
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NULL, /* regset_bitmap */
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&sh_usrregs_info,
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&sh_regsets_info
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};
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static const struct regs_info *
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sh_regs_info (void)
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{
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return ®s_info;
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}
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static void
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sh_arch_setup (void)
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{
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current_process ()->tdesc = tdesc_sh;
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}
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struct linux_target_ops the_low_target = {
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sh_arch_setup,
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sh_regs_info,
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sh_cannot_fetch_register,
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sh_cannot_store_register,
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NULL, /* fetch_register */
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linux_get_pc_32bit,
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linux_set_pc_32bit,
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NULL, /* breakpoint_kind_from_pc */
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sh_sw_breakpoint_from_kind,
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NULL,
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0,
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sh_breakpoint_at,
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NULL, /* supports_z_point_type */
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NULL, /* insert_point */
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NULL, /* remove_point */
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NULL, /* stopped_by_watchpoint */
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NULL, /* stopped_data_address */
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NULL, /* collect_ptrace_register */
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NULL, /* supply_ptrace_register */
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NULL, /* siginfo_fixup */
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NULL, /* new_process */
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NULL, /* new_thread */
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NULL, /* new_fork */
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NULL, /* prepare_to_resume */
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NULL, /* process_qsupported */
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NULL, /* supports_tracepoints */
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NULL, /* get_thread_area */
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NULL, /* install_fast_tracepoint_jump_pad */
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NULL, /* emit_ops */
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NULL, /* get_min_fast_tracepoint_insn_len */
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NULL, /* supports_range_stepping */
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NULL, /* breakpoint_kind_from_current_state */
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sh_supports_hardware_single_step,
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};
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void
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initialize_low_arch (void)
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{
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init_registers_sh ();
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initialize_regsets_info (&sh_regsets_info);
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}
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