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158 lines
3.9 KiB
C
158 lines
3.9 KiB
C
/* GNU/Linux/BFIN specific low level interface, for the remote server for GDB.
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Copyright (C) 2005-2017 Free Software Foundation, Inc.
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Contributed by Analog Devices, 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 <asm/ptrace.h>
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/* Defined in auto-generated file reg-bfin.c. */
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void init_registers_bfin (void);
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extern const struct target_desc *tdesc_bfin;
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static int bfin_regmap[] =
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{
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PT_R0, PT_R1, PT_R2, PT_R3, PT_R4, PT_R5, PT_R6, PT_R7,
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PT_P0, PT_P1, PT_P2, PT_P3, PT_P4, PT_P5, PT_USP, PT_FP,
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PT_I0, PT_I1, PT_I2, PT_I3, PT_M0, PT_M1, PT_M2, PT_M3,
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PT_B0, PT_B1, PT_B2, PT_B3, PT_L0, PT_L1, PT_L2, PT_L3,
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PT_A0X, PT_A0W, PT_A1X, PT_A1W, PT_ASTAT, PT_RETS,
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PT_LC0, PT_LT0, PT_LB0, PT_LC1, PT_LT1, PT_LB1,
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-1 /* PT_CYCLES */, -1 /* PT_CYCLES2 */,
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-1 /* PT_USP */, PT_SEQSTAT, PT_SYSCFG, PT_PC, PT_RETX, PT_RETN, PT_RETE,
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PT_PC,
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};
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#define bfin_num_regs ARRAY_SIZE (bfin_regmap)
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static int
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bfin_cannot_store_register (int regno)
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{
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return (regno >= bfin_num_regs);
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}
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static int
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bfin_cannot_fetch_register (int regno)
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{
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return (regno >= bfin_num_regs);
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}
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#define bfin_breakpoint_len 2
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static const gdb_byte bfin_breakpoint[bfin_breakpoint_len] = {0xa1, 0x00};
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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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bfin_sw_breakpoint_from_kind (int kind, int *size)
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{
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*size = bfin_breakpoint_len;
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return bfin_breakpoint;
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}
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static int
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bfin_breakpoint_at (CORE_ADDR where)
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{
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unsigned char insn[bfin_breakpoint_len];
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read_inferior_memory(where, insn, bfin_breakpoint_len);
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if (insn[0] == bfin_breakpoint[0]
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&& insn[1] == bfin_breakpoint[1])
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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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static void
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bfin_arch_setup (void)
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{
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current_process ()->tdesc = tdesc_bfin;
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}
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/* Support for hardware single step. */
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static int
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bfin_supports_hardware_single_step (void)
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{
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return 1;
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}
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static struct usrregs_info bfin_usrregs_info =
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{
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bfin_num_regs,
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bfin_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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&bfin_usrregs_info,
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};
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static const struct regs_info *
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bfin_regs_info (void)
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{
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return ®s_info;
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}
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struct linux_target_ops the_low_target = {
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bfin_arch_setup,
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bfin_regs_info,
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bfin_cannot_fetch_register,
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bfin_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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bfin_sw_breakpoint_from_kind,
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NULL, /* get_next_pcs */
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2,
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bfin_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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bfin_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_bfin ();
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}
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