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- /* GNU/Linux/SH specific low level interface, for the remote server for GDB.
- Copyright (C) 1995-2022 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;
- const gdb_byte *sw_breakpoint_from_kind (int kind, int *size) override;
- protected:
- void low_arch_setup () override;
- bool low_cannot_fetch_register (int regno) override;
- bool low_cannot_store_register (int regno) override;
- bool low_supports_breakpoints () override;
- CORE_ADDR low_get_pc (regcache *regcache) override;
- void low_set_pc (regcache *regcache, CORE_ADDR newpc) override;
- bool low_breakpoint_at (CORE_ADDR pc) override;
- };
- /* The singleton target ops object. */
- static sh_target the_sh_target;
- bool
- sh_target::low_supports_breakpoints ()
- {
- return true;
- }
- CORE_ADDR
- sh_target::low_get_pc (regcache *regcache)
- {
- return linux_get_pc_32bit (regcache);
- }
- void
- sh_target::low_set_pc (regcache *regcache, CORE_ADDR pc)
- {
- linux_set_pc_32bit (regcache, pc);
- }
- /* 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 target ops method "sw_breakpoint_from_kind". */
- const gdb_byte *
- sh_target::sw_breakpoint_from_kind (int kind, int *size)
- {
- *size = sh_breakpoint_len;
- return (const gdb_byte *) &sh_breakpoint;
- }
- bool
- sh_target::low_breakpoint_at (CORE_ADDR where)
- {
- unsigned short insn;
- read_memory (where, (unsigned char *) &insn, 2);
- if (insn == sh_breakpoint)
- return true;
- /* If necessary, recognize more trap instructions here. GDB only uses the
- one. */
- return false;
- }
- /* 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;
- }
- /* 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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