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256 lines
6.2 KiB
C
256 lines
6.2 KiB
C
/* GNU/Linux/m68k specific low level interface, for the remote server for GDB.
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Copyright (C) 1995-2018 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-m68k.c. */
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void init_registers_m68k (void);
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extern const struct target_desc *tdesc_m68k;
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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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#define m68k_num_regs 29
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#define m68k_num_gregs 18
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/* This table must line up with REGISTER_NAMES in tm-m68k.h */
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static int m68k_regmap[] =
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{
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#ifdef PT_D0
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PT_D0 * 4, PT_D1 * 4, PT_D2 * 4, PT_D3 * 4,
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PT_D4 * 4, PT_D5 * 4, PT_D6 * 4, PT_D7 * 4,
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PT_A0 * 4, PT_A1 * 4, PT_A2 * 4, PT_A3 * 4,
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PT_A4 * 4, PT_A5 * 4, PT_A6 * 4, PT_USP * 4,
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PT_SR * 4, PT_PC * 4,
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#else
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14 * 4, 0 * 4, 1 * 4, 2 * 4, 3 * 4, 4 * 4, 5 * 4, 6 * 4,
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7 * 4, 8 * 4, 9 * 4, 10 * 4, 11 * 4, 12 * 4, 13 * 4, 15 * 4,
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17 * 4, 18 * 4,
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#endif
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#ifdef PT_FP0
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PT_FP0 * 4, PT_FP1 * 4, PT_FP2 * 4, PT_FP3 * 4,
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PT_FP4 * 4, PT_FP5 * 4, PT_FP6 * 4, PT_FP7 * 4,
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PT_FPCR * 4, PT_FPSR * 4, PT_FPIAR * 4
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#else
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21 * 4, 24 * 4, 27 * 4, 30 * 4, 33 * 4, 36 * 4,
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39 * 4, 42 * 4, 45 * 4, 46 * 4, 47 * 4
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#endif
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};
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static int
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m68k_cannot_store_register (int regno)
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{
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return (regno >= m68k_num_regs);
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}
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static int
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m68k_cannot_fetch_register (int regno)
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{
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return (regno >= m68k_num_regs);
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}
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#ifdef HAVE_PTRACE_GETREGS
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#include <sys/procfs.h>
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#include "nat/gdb_ptrace.h"
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static void
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m68k_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 < m68k_num_gregs; i++)
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collect_register (regcache, i, (char *) buf + m68k_regmap[i]);
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}
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static void
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m68k_store_gregset (struct regcache *regcache, const void *buf)
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{
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int i;
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for (i = 0; i < m68k_num_gregs; i++)
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supply_register (regcache, i, (const char *) buf + m68k_regmap[i]);
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}
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static void
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m68k_fill_fpregset (struct regcache *regcache, void *buf)
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{
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int i;
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for (i = m68k_num_gregs; i < m68k_num_regs; i++)
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collect_register (regcache, i, ((char *) buf
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+ (m68k_regmap[i] - m68k_regmap[m68k_num_gregs])));
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}
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static void
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m68k_store_fpregset (struct regcache *regcache, const void *buf)
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{
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int i;
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for (i = m68k_num_gregs; i < m68k_num_regs; i++)
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supply_register (regcache, i, ((const char *) buf
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+ (m68k_regmap[i] - m68k_regmap[m68k_num_gregs])));
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}
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#endif /* HAVE_PTRACE_GETREGS */
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static struct regset_info m68k_regsets[] = {
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#ifdef HAVE_PTRACE_GETREGS
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{ PTRACE_GETREGS, PTRACE_SETREGS, 0, sizeof (elf_gregset_t),
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GENERAL_REGS,
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m68k_fill_gregset, m68k_store_gregset },
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{ PTRACE_GETFPREGS, PTRACE_SETFPREGS, 0, sizeof (elf_fpregset_t),
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FP_REGS,
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m68k_fill_fpregset, m68k_store_fpregset },
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#endif /* HAVE_PTRACE_GETREGS */
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NULL_REGSET
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};
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static const gdb_byte m68k_breakpoint[] = { 0x4E, 0x4F };
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#define m68k_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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m68k_sw_breakpoint_from_kind (int kind, int *size)
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{
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*size = m68k_breakpoint_len;
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return m68k_breakpoint;
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}
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static int
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m68k_breakpoint_at (CORE_ADDR pc)
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{
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unsigned char c[2];
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read_inferior_memory (pc, c, 2);
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if (c[0] == 0x4E && c[1] == 0x4F)
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return 1;
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return 0;
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}
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#include <asm/ptrace.h>
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#ifdef PTRACE_GET_THREAD_AREA
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/* Fetch the thread-local storage pointer for libthread_db. */
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ps_err_e
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ps_get_thread_area (struct ps_prochandle *ph,
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lwpid_t lwpid, int idx, void **base)
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{
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if (ptrace (PTRACE_GET_THREAD_AREA, lwpid, NULL, base) != 0)
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return PS_ERR;
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/* IDX is the bias from the thread pointer to the beginning of the
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thread descriptor. It has to be subtracted due to implementation
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quirks in libthread_db. */
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*base = (void *) ((char *)*base - idx);
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return PS_OK;
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}
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#endif /* PTRACE_GET_THREAD_AREA */
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static struct regsets_info m68k_regsets_info =
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{
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m68k_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 m68k_usrregs_info =
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{
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m68k_num_regs,
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m68k_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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&m68k_usrregs_info,
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&m68k_regsets_info
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};
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static const struct regs_info *
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m68k_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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m68k_arch_setup (void)
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{
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current_process ()->tdesc = tdesc_m68k;
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}
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/* Support for hardware single step. */
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static int
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m68k_supports_hardware_single_step (void)
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{
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return 1;
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}
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struct linux_target_ops the_low_target = {
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m68k_arch_setup,
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m68k_regs_info,
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m68k_cannot_fetch_register,
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m68k_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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m68k_sw_breakpoint_from_kind,
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NULL,
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2,
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m68k_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, /* delete_process */
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NULL, /* new_thread */
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NULL, /* delete_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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m68k_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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/* Initialize the Linux target descriptions. */
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init_registers_m68k ();
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initialize_regsets_info (&m68k_regsets_info);
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}
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