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4b218c1874
sigtramp_end to i386bsd_sigtramp_start and i386bsd_sigtramp_end. * i386nbsd-tdep.c (i386nbsd_init_abi): Set sigtramp_start and sigtramp_end to NULL. * config/i386/tm-fbsd.h (SIGTRAMP_START, SIGTRAMP_END): Remove defines. (i386bsd_sigtramp_start, i386_sigtramp_end): Remove prototypes.
307 lines
8.1 KiB
C
307 lines
8.1 KiB
C
/* Target-dependent code for NetBSD/i386, for GDB.
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Copyright 1988, 1989, 1991, 1992, 1994, 1996, 2000, 2001, 2002
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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 2 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, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include "defs.h"
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#include "gdbtypes.h"
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#include "gdbcore.h"
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#include "regcache.h"
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#include "arch-utils.h"
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#include "i386-tdep.h"
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#include "i387-tdep.h"
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#include "nbsd-tdep.h"
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#include "solib-svr4.h"
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/* Map a GDB register number to an offset in the reg structure. */
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static int regmap[] =
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{
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( 0 * 4), /* %eax */
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( 1 * 4), /* %ecx */
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( 2 * 4), /* %edx */
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( 3 * 4), /* %ebx */
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( 4 * 4), /* %esp */
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( 5 * 4), /* %epb */
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( 6 * 4), /* %esi */
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( 7 * 4), /* %edi */
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( 8 * 4), /* %eip */
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( 9 * 4), /* %eflags */
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(10 * 4), /* %cs */
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(11 * 4), /* %ss */
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(12 * 4), /* %ds */
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(13 * 4), /* %es */
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(14 * 4), /* %fs */
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(15 * 4), /* %gs */
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};
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#define SIZEOF_STRUCT_REG (16 * 4)
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static void
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i386nbsd_supply_reg (char *regs, int regno)
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{
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int i;
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for (i = 0; i <= 15; i++)
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if (regno == i || regno == -1)
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supply_register (i, regs + regmap[i]);
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}
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static void
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fetch_core_registers (char *core_reg_sect, unsigned core_reg_size, int which,
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CORE_ADDR ignore)
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{
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char *regs, *fsave;
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/* We get everything from one section. */
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if (which != 0)
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return;
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if (core_reg_size < (SIZEOF_STRUCT_REG + 108))
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{
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warning ("Wrong size register set in core file.");
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return;
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}
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regs = core_reg_sect;
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fsave = core_reg_sect + SIZEOF_STRUCT_REG;
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/* Integer registers. */
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i386nbsd_supply_reg (regs, -1);
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/* Floating point registers. */
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i387_supply_fsave (fsave);
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}
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static void
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fetch_elfcore_registers (char *core_reg_sect, unsigned core_reg_size,
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int which, CORE_ADDR ignore)
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{
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switch (which)
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{
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case 0: /* Integer registers. */
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if (core_reg_size != SIZEOF_STRUCT_REG)
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warning ("Wrong size register set in core file.");
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else
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i386nbsd_supply_reg (core_reg_sect, -1);
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break;
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case 2: /* Floating point registers. */
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if (core_reg_size != 108)
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warning ("Wrong size FP register set in core file.");
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else
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i387_supply_fsave (core_reg_sect);
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break;
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case 3: /* "Extended" floating point registers. This is gdb-speak
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for SSE/SSE2. */
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if (core_reg_size != 512)
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warning ("Wrong size XMM register set in core file.");
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else
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i387_supply_fxsave (core_reg_sect);
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break;
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default:
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/* Don't know what kind of register request this is; just ignore it. */
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break;
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}
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}
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static struct core_fns i386nbsd_core_fns =
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{
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bfd_target_unknown_flavour, /* core_flavour */
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default_check_format, /* check_format */
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default_core_sniffer, /* core_sniffer */
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fetch_core_registers, /* core_read_registers */
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NULL /* next */
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};
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static struct core_fns i386nbsd_elfcore_fns =
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{
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bfd_target_elf_flavour, /* core_flavour */
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default_check_format, /* check_format */
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default_core_sniffer, /* core_sniffer */
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fetch_elfcore_registers, /* core_read_registers */
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NULL /* next */
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};
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/* Under NetBSD/i386, signal handler invocations can be identified by the
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designated code sequence that is used to return from a signal handler.
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In particular, the return address of a signal handler points to the
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following code sequence:
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leal 0x10(%esp), %eax
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pushl %eax
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pushl %eax
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movl $0x127, %eax # __sigreturn14
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int $0x80
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Each instruction has a unique encoding, so we simply attempt to match
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the instruction the PC is pointing to with any of the above instructions.
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If there is a hit, we know the offset to the start of the designated
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sequence and can then check whether we really are executing in the
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signal trampoline. If not, -1 is returned, otherwise the offset from the
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start of the return sequence is returned. */
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#define RETCODE_INSN1 0x8d
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#define RETCODE_INSN2 0x50
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#define RETCODE_INSN3 0x50
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#define RETCODE_INSN4 0xb8
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#define RETCODE_INSN5 0xcd
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#define RETCODE_INSN2_OFF 4
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#define RETCODE_INSN3_OFF 5
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#define RETCODE_INSN4_OFF 6
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#define RETCODE_INSN5_OFF 11
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static const unsigned char sigtramp_retcode[] =
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{
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RETCODE_INSN1, 0x44, 0x24, 0x10,
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RETCODE_INSN2,
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RETCODE_INSN3,
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RETCODE_INSN4, 0x27, 0x01, 0x00, 0x00,
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RETCODE_INSN5, 0x80,
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};
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static LONGEST
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i386nbsd_sigtramp_offset (CORE_ADDR pc)
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{
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unsigned char ret[sizeof(sigtramp_retcode)], insn;
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LONGEST off;
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int i;
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if (read_memory_nobpt (pc, &insn, 1) != 0)
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return -1;
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switch (insn)
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{
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case RETCODE_INSN1:
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off = 0;
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break;
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case RETCODE_INSN2:
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/* INSN2 and INSN3 are the same. Read at the location of PC+1
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to determine if we're actually looking at INSN2 or INSN3. */
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if (read_memory_nobpt (pc + 1, &insn, 1) != 0)
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return -1;
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if (insn == RETCODE_INSN3)
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off = RETCODE_INSN2_OFF;
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else
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off = RETCODE_INSN3_OFF;
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break;
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case RETCODE_INSN4:
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off = RETCODE_INSN4_OFF;
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break;
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case RETCODE_INSN5:
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off = RETCODE_INSN5_OFF;
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break;
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default:
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return -1;
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}
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pc -= off;
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if (read_memory_nobpt (pc, (char *) ret, sizeof (ret)) != 0)
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return -1;
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if (memcmp (ret, sigtramp_retcode, sizeof (ret)) == 0)
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return off;
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return -1;
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}
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static int
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i386nbsd_pc_in_sigtramp (CORE_ADDR pc, char *name)
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{
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return (nbsd_pc_in_sigtramp (pc, name)
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|| i386nbsd_sigtramp_offset (pc) >= 0);
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}
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/* From <machine/signal.h>. */
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int i386nbsd_sc_pc_offset = 44;
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int i386nbsd_sc_sp_offset = 56;
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static void
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i386nbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
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{
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struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
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/* Obviously NetBSD is BSD-based. */
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i386bsd_init_abi (info, gdbarch);
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/* NetBSD has different signal trampoline conventions. */
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set_gdbarch_pc_in_sigtramp (gdbarch, i386nbsd_pc_in_sigtramp);
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/* FIXME: kettenis/20020906: We should probably provide
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NetBSD-specific versions of these functions if we want to
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recognize signal trampolines that live on the stack. */
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set_gdbarch_sigtramp_start (gdbarch, NULL);
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set_gdbarch_sigtramp_end (gdbarch, NULL);
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/* NetBSD uses -freg-struct-return by default. */
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tdep->struct_return = reg_struct_return;
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/* NetBSD has a `struct sigcontext' that's different from the
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origional 4.3 BSD. */
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tdep->sc_pc_offset = i386nbsd_sc_pc_offset;
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tdep->sc_sp_offset = i386nbsd_sc_sp_offset;
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}
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/* NetBSD ELF. */
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static void
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i386nbsdelf_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
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{
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struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
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/* It's still NetBSD. */
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i386nbsd_init_abi (info, gdbarch);
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/* But ELF-based. */
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i386_elf_init_abi (info, gdbarch);
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/* NetBSD ELF uses SVR4-style shared libraries. */
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set_gdbarch_in_solib_call_trampoline (gdbarch,
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generic_in_solib_call_trampoline);
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set_solib_svr4_fetch_link_map_offsets (gdbarch,
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nbsd_ilp32_solib_svr4_fetch_link_map_offsets);
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/* NetBSD ELF uses -fpcc-struct-return by default. */
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tdep->struct_return = pcc_struct_return;
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/* We support the SSE registers on NetBSD ELF. */
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tdep->num_xmm_regs = I386_NUM_XREGS - 1;
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set_gdbarch_num_regs (gdbarch, I386_NUM_GREGS + I386_NUM_FREGS
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+ I386_NUM_XREGS);
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}
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void
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_initialize_i386nbsd_tdep (void)
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{
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add_core_fns (&i386nbsd_core_fns);
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add_core_fns (&i386nbsd_elfcore_fns);
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gdbarch_register_osabi (bfd_arch_i386, GDB_OSABI_NETBSD_AOUT,
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i386nbsd_init_abi);
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gdbarch_register_osabi (bfd_arch_i386, GDB_OSABI_NETBSD_ELF,
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i386nbsdelf_init_abi);
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}
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