170 lines
3.6 KiB
C++
170 lines
3.6 KiB
C++
/* GNU/Linux/CRIS specific low level interface, for the remote server for GDB.
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Copyright (C) 1995-2020 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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#include "nat/gdb_ptrace.h"
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/* Linux target op definitions for the CRIS architecture. */
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class cris_target : public linux_process_target
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{
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public:
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const regs_info *get_regs_info () override;
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const gdb_byte *sw_breakpoint_from_kind (int kind, int *size) override;
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protected:
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void low_arch_setup () override;
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bool low_cannot_fetch_register (int regno) override;
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bool low_cannot_store_register (int regno) override;
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bool low_supports_breakpoints () override;
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CORE_ADDR low_get_pc (regcache *regcache) override;
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void low_set_pc (regcache *regcache, CORE_ADDR newpc) override;
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bool low_breakpoint_at (CORE_ADDR pc) override;
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};
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/* The singleton target ops object. */
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static cris_target the_cris_target;
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bool
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cris_target::low_supports_breakpoints ()
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{
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return true;
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}
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CORE_ADDR
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cris_target::low_get_pc (regcache *regcache)
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{
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return linux_get_pc_32bit (regcache);
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}
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void
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cris_target::low_set_pc (regcache *regcache, CORE_ADDR pc)
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{
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linux_set_pc_32bit (regcache, pc);
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}
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/* Defined in auto-generated file reg-cris.c. */
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void init_registers_cris (void);
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extern const struct target_desc *tdesc_cris;
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/* CRISv10 */
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#define cris_num_regs 32
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/* Locations need to match <include/asm/arch/ptrace.h>. */
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static int cris_regmap[] = {
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15*4, 14*4, 13*4, 12*4,
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11*4, 10*4, 9*4, 8*4,
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7*4, 6*4, 5*4, 4*4,
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3*4, 2*4, 23*4, 19*4,
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-1, -1, -1, -1,
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-1, 17*4, -1, 16*4,
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-1, -1, -1, 18*4,
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-1, 17*4, -1, -1
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};
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bool
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cris_target::low_cannot_store_register (int regno)
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{
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if (cris_regmap[regno] == -1)
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return true;
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return (regno >= cris_num_regs);
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}
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bool
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cris_target::low_cannot_fetch_register (int regno)
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{
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if (cris_regmap[regno] == -1)
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return true;
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return (regno >= cris_num_regs);
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}
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static const unsigned short cris_breakpoint = 0xe938;
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#define cris_breakpoint_len 2
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/* Implementation of target ops method "sw_breakpoint_from_kind". */
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const gdb_byte *
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cris_target::sw_breakpoint_from_kind (int kind, int *size)
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{
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*size = cris_breakpoint_len;
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return (const gdb_byte *) &cris_breakpoint;
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}
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bool
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cris_target::low_breakpoint_at (CORE_ADDR where)
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{
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unsigned short insn;
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read_memory (where, (unsigned char *) &insn, cris_breakpoint_len);
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if (insn == cris_breakpoint)
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return true;
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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 false;
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}
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void
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cris_target::low_arch_setup ()
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{
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current_process ()->tdesc = tdesc_cris;
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}
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static struct usrregs_info cris_usrregs_info =
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{
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cris_num_regs,
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cris_regmap,
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};
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static struct regs_info myregs_info =
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{
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NULL, /* regset_bitmap */
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&cris_usrregs_info,
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};
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const regs_info *
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cris_target::get_regs_info ()
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{
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return &myregs_info;
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}
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/* The linux target ops object. */
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linux_process_target *the_linux_target = &the_cris_target;
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void
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initialize_low_arch (void)
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{
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init_registers_cris ();
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}
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