551 lines
16 KiB
C
551 lines
16 KiB
C
/* Target-dependent code for NetBSD/i386.
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Copyright (C) 1988, 1989, 1991, 1992, 1994, 1996, 2000, 2001, 2002,
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2003, 2004
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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., 51 Franklin Street, Fifth Floor,
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Boston, MA 02110-1301, USA. */
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#include "defs.h"
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#include "arch-utils.h"
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#include "frame.h"
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#include "gdbcore.h"
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#include "regcache.h"
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#include "regset.h"
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#include "osabi.h"
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#include "symtab.h"
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#include "gdb_assert.h"
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#include "gdb_string.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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#include "elf-bfd.h" /* for header hack */
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#include "trad-frame.h" /* signal trampoline/kernel frame support */
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#include "frame-unwind.h" /* kernel frame support */
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#include "tramp-frame.h" /* signal trampoline/kernel frame support
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/* From <machine/reg.h>. */
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static int i386nbsd_r_reg_offset[] =
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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, /* %ebp */
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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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static void
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i386nbsd_aout_supply_regset (const struct regset *regset,
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struct regcache *regcache, int regnum,
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const void *regs, size_t len)
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{
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const struct gdbarch_tdep *tdep = gdbarch_tdep (regset->arch);
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gdb_assert (len >= tdep->sizeof_gregset + I387_SIZEOF_FSAVE);
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i386_supply_gregset (regset, regcache, regnum, regs, tdep->sizeof_gregset);
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i387_supply_fsave (regcache, regnum, (char *) regs + tdep->sizeof_gregset);
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}
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static const struct regset *
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i386nbsd_aout_regset_from_core_section (struct gdbarch *gdbarch,
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const char *sect_name,
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size_t sect_size)
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{
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struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
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/* NetBSD a.out core dumps don't use seperate register sets for the
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general-purpose and floating-point registers. */
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if (strcmp (sect_name, ".reg") == 0
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&& sect_size >= tdep->sizeof_gregset + I387_SIZEOF_FSAVE)
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{
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if (tdep->gregset == NULL)
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tdep->gregset =
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regset_alloc (gdbarch, i386nbsd_aout_supply_regset, NULL);
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return tdep->gregset;
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}
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return NULL;
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}
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/* From <machine/signal.h>. */
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int i386nbsd_sc_reg_offset[] =
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{
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10 * 4, /* %eax */
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9 * 4, /* %ecx */
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8 * 4, /* %edx */
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7 * 4, /* %ebx */
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14 * 4, /* %esp */
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6 * 4, /* %ebp */
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5 * 4, /* %esi */
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4 * 4, /* %edi */
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11 * 4, /* %eip */
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13 * 4, /* %eflags */
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12 * 4, /* %cs */
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15 * 4, /* %ss */
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3 * 4, /* %ds */
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2 * 4, /* %es */
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1 * 4, /* %fs */
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0 * 4 /* %gs */
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};
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/* From <machine/mcontext.h>. */
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int i386nbsd_mc_reg_offset[] =
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{
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11 * 4, /* %eax */
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10 * 4, /* %ecx */
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9 * 4, /* %edx */
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8 * 4, /* %ebx */
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7 * 4, /* %esp */
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6 * 4, /* %ebp */
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5 * 4, /* %esi */
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4 * 4, /* %edi */
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14 * 4, /* %eip */
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16 * 4, /* %eflags */
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15 * 4, /* %cs */
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18 * 4, /* %ss */
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3 * 4, /* %ds */
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2 * 4, /* %es */
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1 * 4, /* %fs */
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0 * 4 /* %gs */
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};
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static void
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i386nbsd_sigtramp_cache_init (const struct tramp_frame *,
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struct frame_info *,
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struct trad_frame_cache *,
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CORE_ADDR);
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static const struct tramp_frame i386nbsd_sigtramp_sc16 =
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{
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SIGTRAMP_FRAME,
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1,
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{
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{ 0x8d, -1 }, { 0x44, -1 }, { 0x24, -1 }, { 0x10, -1 },
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/* leal 0x10(%esp), %eax */
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{ 0x50, -1 }, /* pushl %eax */
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{ 0x50, -1 }, /* pushl %eax */
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{ 0xb8, -1 }, { 0x27, -1 }, {0x01, -1 }, {0x00, -1 }, {0x00, -1 },
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/* movl $0x127, %eax # __sigreturn14 */
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{ 0xcd, -1 }, { 0x80, -1},
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/* int $0x80 */
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{ 0xb8, -1 }, { 0x01, -1 }, {0x00, -1 }, {0x00, -1 }, {0x00, -1 },
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/* movl $0x1, %eax # exit */
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{ 0xcd, -1 }, { 0x80, -1},
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/* int $0x80 */
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{ TRAMP_SENTINEL_INSN, -1 }
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},
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i386nbsd_sigtramp_cache_init
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};
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static const struct tramp_frame i386nbsd_sigtramp_sc2 =
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{
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SIGTRAMP_FRAME,
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1,
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{
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{ 0x8d, -1 }, { 0x44, -1 }, { 0x24, -1 }, { 0x0c, -1 },
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/* leal 0x0c(%esp), %eax */
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{ 0x89, -1 }, { 0x44, -1 }, { 0x24, -1 }, { 0x04, -1 },
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/* movl %eax, 0x4(%esp) */
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{ 0xb8, -1 }, { 0x27, -1 }, {0x01, -1 }, {0x00, -1 }, {0x00, -1 },
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/* movl $0x127, %eax # __sigreturn14 */
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{ 0xcd, -1 }, { 0x80, -1},
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/* int $0x80 */
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{ 0x89, -1 }, { 0x44, -1 }, { 0x24, -1 }, { 0x04, -1 },
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/* movl %eax, 0x4(%esp) */
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{ 0xb8, -1 }, { 0x01, -1 }, {0x00, -1 }, {0x00, -1 }, {0x00, -1 },
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/* movl $0x1, %eax */
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{ 0xcd, -1 }, { 0x80, -1},
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/* int $0x80 */
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{ TRAMP_SENTINEL_INSN, -1 }
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},
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i386nbsd_sigtramp_cache_init
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};
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static const struct tramp_frame i386nbsd_sigtramp_si2 =
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{
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SIGTRAMP_FRAME,
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1,
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{
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{ 0x8b, -1 }, { 0x44, -1 }, { 0x24, -1 }, { 0x08, -1 },
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/* movl 8(%esp),%eax */
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{ 0x89, -1 }, { 0x44, -1 }, { 0x24, -1 }, { 0x04, -1 },
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/* movl %eax, 0x4(%esp) */
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{ 0xb8, -1 }, { 0x34, -1 }, { 0x01, -1 }, { 0x00, -1 }, { 0x00, -1 },
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/* movl $0x134, %eax # setcontext */
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{ 0xcd, -1 }, { 0x80, -1 },
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/* int $0x80 */
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{ 0x89, -1 }, { 0x44, -1 }, { 0x24, -1 }, { 0x04, -1 },
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/* movl %eax, 0x4(%esp) */
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{ 0xb8, -1 }, { 0x01, -1 }, { 0x00, -1 }, { 0x00, -1 }, { 0x00, -1 },
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/* movl $0x1, %eax */
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{ 0xcd, -1 }, { 0x80, -1 },
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/* int $0x80 */
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{ TRAMP_SENTINEL_INSN, -1 }
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},
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i386nbsd_sigtramp_cache_init
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};
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static const struct tramp_frame i386nbsd_sigtramp_si31 =
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{
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SIGTRAMP_FRAME,
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1,
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{
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{ 0x8d, -1 }, { 0x84, -1 }, { 0x24, -1 },
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{ 0x8c, -1 }, { 0x00, -1 }, { 0x00, -1 }, { 0x00, -1 },
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/* leal 0x8c(%esp), %eax */
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{ 0x89, -1 }, { 0x44, -1 }, { 0x24, -1 }, { 0x04, -1 },
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/* movl %eax, 0x4(%esp) */
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{ 0xb8, -1 }, { 0x34, -1 }, { 0x01, -1 }, { 0x00, -1 }, { 0x00, -1 },
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/* movl $0x134, %eax # setcontext */
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{ 0xcd, -1 }, { 0x80, -1},
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/* int $0x80 */
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{ 0x89, -1 }, { 0x44, -1 }, { 0x24, -1 }, { 0x04, -1 },
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/* movl %eax, 0x4(%esp) */
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{ 0xb8, -1 }, { 0x01, -1 }, {0x00, -1 }, {0x00, -1 }, {0x00, -1 },
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/* movl $0x1, %eax */
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{ 0xcd, -1 }, { 0x80, -1},
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/* int $0x80 */
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{ TRAMP_SENTINEL_INSN, -1 }
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},
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i386nbsd_sigtramp_cache_init
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};
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static const struct tramp_frame i386nbsd_sigtramp_si4 =
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{
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SIGTRAMP_FRAME,
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1,
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{
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{ 0x8d, -1 }, { 0x84, -1 }, { 0x24, -1 },
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{ 0x8c, -1 }, { 0x00, -1 }, { 0x00, -1 }, { 0x00, -1 },
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/* leal 0x8c(%esp), %eax */
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{ 0x89, -1 }, { 0x44, -1 }, { 0x24, -1 }, { 0x04, -1 },
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/* movl %eax, 0x4(%esp) */
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{ 0xb8, -1 }, { 0x34, -1 }, { 0x01, -1 }, { 0x00, -1 }, { 0x00, -1 },
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/* movl $0x134, %eax # setcontext */
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{ 0xcd, -1 }, { 0x80, -1},
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/* int $0x80 */
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{ 0xc7, -1 }, { 0x44, -1 }, { 0x24, -1 }, { 0x04, -1 },
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{ 0xff, -1 }, { 0xff, -1 }, { 0xff, -1 }, { 0xff, -1 },
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/* movl $0xffffffff,0x4(%esp) */
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{ 0xb8, -1 }, { 0x01, -1 }, {0x00, -1 }, {0x00, -1 }, {0x00, -1 },
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/* movl $0x1, %eax */
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{ 0xcd, -1 }, { 0x80, -1},
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/* int $0x80 */
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{ TRAMP_SENTINEL_INSN, -1 }
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},
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i386nbsd_sigtramp_cache_init
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};
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static void
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i386nbsd_sigtramp_cache_init (const struct tramp_frame *self,
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struct frame_info *next_frame,
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struct trad_frame_cache *this_cache,
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CORE_ADDR func)
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{
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struct gdbarch *gdbarch = get_frame_arch (next_frame);
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struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
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CORE_ADDR sp = frame_unwind_register_unsigned (next_frame, I386_ESP_REGNUM);
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CORE_ADDR base;
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int *reg_offset;
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int num_regs;
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int i;
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if (self == &i386nbsd_sigtramp_sc16 || self == &i386nbsd_sigtramp_sc2)
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{
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reg_offset = i386nbsd_sc_reg_offset;
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num_regs = ARRAY_SIZE (i386nbsd_sc_reg_offset);
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/* Read in the sigcontext address */
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base = read_memory_unsigned_integer (sp + 8, 4);
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}
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else
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{
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reg_offset = i386nbsd_mc_reg_offset;
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num_regs = ARRAY_SIZE (i386nbsd_mc_reg_offset);
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/* Read in the ucontext address */
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base = read_memory_unsigned_integer (sp + 8, 4);
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/* offsetof(ucontext_t, uc_mcontext) == 36 */
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base += 36;
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}
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for (i = 0; i < num_regs; i++)
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if (reg_offset[i] != -1)
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trad_frame_set_reg_addr (this_cache, i, base + reg_offset[i]);
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/* Construct the frame ID using the function start. */
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trad_frame_set_id (this_cache, frame_id_build (sp, func));
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}
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/* Kernel debugging support */
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/* From <machine/frame.h>. Note that %esp and %ess are only saved in
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a trap frame when entering the kernel from user space. */
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static int i386nbsd_tf_reg_offset[] =
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{
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10 * 4, /* %eax */
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9 * 4, /* %ecx */
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8 * 4, /* %edx */
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7 * 4, /* %ebx */
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-1, /* %esp */
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6 * 4, /* %ebp */
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5 * 4, /* %esi */
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4 * 4, /* %edi */
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13 * 4, /* %eip */
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15 * 4, /* %eflags */
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14 * 4, /* %cs */
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-1, /* %ss */
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3 * 4, /* %ds */
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2 * 4, /* %es */
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1 * 4, /* %fs */
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0 * 4 /* %gs */
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};
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static struct trad_frame_cache *
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i386nbsd_trapframe_cache(struct frame_info *next_frame, void **this_cache)
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{
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struct trad_frame_cache *cache;
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CORE_ADDR func, sp, addr, tmp;
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ULONGEST cs;
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char *name;
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int i;
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if (*this_cache)
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return *this_cache;
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cache = trad_frame_cache_zalloc (next_frame);
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*this_cache = cache;
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func = frame_func_unwind (next_frame);
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sp = frame_unwind_register_unsigned (next_frame, I386_ESP_REGNUM);
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find_pc_partial_function (func, &name, NULL, NULL);
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if (name && strncmp (name, "Xintr", 5) == 0)
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{
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/* It's an interrupt frame. */
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tmp = read_memory_unsigned_integer (sp + 4, 4);
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if (tmp < 15)
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{
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/* Reasonable value for 'ppl': already on interrupt stack. */
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addr = sp + 8;
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}
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else
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{
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/* Switch to previous stack. */
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addr = tmp + 4;
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}
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}
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else
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{
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/* It's a trap frame. */
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addr = sp + 4;
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}
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for (i = 0; i < ARRAY_SIZE (i386nbsd_tf_reg_offset); i++)
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if (i386nbsd_tf_reg_offset[i] != -1)
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trad_frame_set_reg_addr (cache, i, addr + i386nbsd_tf_reg_offset[i]);
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/* Read %cs from trap frame. */
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addr += i386nbsd_tf_reg_offset[I386_CS_REGNUM];
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cs = read_memory_unsigned_integer (addr, 4);
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if ((cs & I386_SEL_RPL) == I386_SEL_UPL)
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{
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/* Trap from user space; terminate backtrace. */
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trad_frame_set_id (cache, null_frame_id);
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}
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else
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{
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/* Construct the frame ID using the function start. */
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trad_frame_set_id (cache, frame_id_build (sp + 8, func));
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}
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return cache;
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}
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static void
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i386nbsd_trapframe_this_id (struct frame_info *next_frame,
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void **this_cache, struct frame_id *this_id)
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{
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struct trad_frame_cache *cache =
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i386nbsd_trapframe_cache (next_frame, this_cache);
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trad_frame_get_id (cache, this_id);
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}
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static void
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i386nbsd_trapframe_prev_register (struct frame_info *next_frame,
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void **this_cache, int regnum,
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int *optimizedp, enum lval_type *lvalp,
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CORE_ADDR *addrp, int *realnump,
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gdb_byte *valuep)
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{
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struct trad_frame_cache *cache =
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i386nbsd_trapframe_cache (next_frame, this_cache);
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trad_frame_get_register (cache, next_frame, regnum,
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optimizedp, lvalp, addrp, realnump, valuep);
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}
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static int
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i386nbsd_trapframe_sniffer (const struct frame_unwind *self,
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struct frame_info *next_frame,
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void **this_prologue_cache)
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{
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ULONGEST cs;
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char *name;
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/* Check Current Privilege Level and bail out if we're not executing
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in kernel space. */
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cs = frame_unwind_register_unsigned (next_frame, I386_CS_REGNUM);
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if ((cs & I386_SEL_RPL) == I386_SEL_UPL)
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return 0;
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find_pc_partial_function (frame_pc_unwind (next_frame), &name, NULL, NULL);
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return (name && ((strcmp (name, "alltraps") == 0)
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|| (strcmp (name, "calltrap") == 0)
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|| (strncmp (name, "Xtrap", 5) == 0)
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|| (strcmp (name, "syscall1") == 0)
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|| (strcmp (name, "Xsyscall") == 0)
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|| (strncmp (name, "Xintr", 5) == 0)
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|| (strncmp (name, "Xresume", 7) == 0)
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|| (strncmp (name, "Xstray", 6) == 0)
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|| (strncmp (name, "Xrecurse", 8) == 0)
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|| (strncmp (name, "Xsoft", 5) == 0)
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|| (strncmp (name, "Xdoreti", 5) == 0)));
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}
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const struct frame_unwind i386nbsd_trapframe_unwind = {
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/* FIXME: kettenis/20051219: This really is more like an interrupt
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frame, but SIGTRAMP_FRAME would print <signal handler called>,
|
||
which really is not what we want here. */
|
||
NORMAL_FRAME,
|
||
i386nbsd_trapframe_this_id,
|
||
i386nbsd_trapframe_prev_register,
|
||
NULL,
|
||
i386nbsd_trapframe_sniffer
|
||
};
|
||
|
||
static void
|
||
i386nbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
|
||
{
|
||
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
|
||
|
||
/* Obviously NetBSD is BSD-based. */
|
||
i386bsd_init_abi (info, gdbarch);
|
||
|
||
/* NetBSD has a different `struct reg'. */
|
||
tdep->gregset_reg_offset = i386nbsd_r_reg_offset;
|
||
tdep->gregset_num_regs = ARRAY_SIZE (i386nbsd_r_reg_offset);
|
||
tdep->sizeof_gregset = 16 * 4;
|
||
|
||
/* NetBSD uses -freg-struct-return by default. */
|
||
tdep->struct_return = reg_struct_return;
|
||
|
||
/* NetBSD uses tramp_frame sniffers for signal trampolines. */
|
||
tdep->sigcontext_addr= 0;
|
||
tdep->sigtramp_start = 0;
|
||
tdep->sigtramp_end = 0;
|
||
tdep->sigtramp_p = 0;
|
||
tdep->sc_reg_offset = 0;
|
||
tdep->sc_num_regs = 0;
|
||
|
||
tramp_frame_prepend_unwinder (gdbarch, &i386nbsd_sigtramp_sc16);
|
||
tramp_frame_prepend_unwinder (gdbarch, &i386nbsd_sigtramp_sc2);
|
||
tramp_frame_prepend_unwinder (gdbarch, &i386nbsd_sigtramp_si2);
|
||
tramp_frame_prepend_unwinder (gdbarch, &i386nbsd_sigtramp_si31);
|
||
tramp_frame_prepend_unwinder (gdbarch, &i386nbsd_sigtramp_si4);
|
||
|
||
/* Unwind kernel trap frames correctly. */
|
||
frame_unwind_prepend_unwinder (gdbarch, &i386nbsd_trapframe_unwind);
|
||
}
|
||
|
||
/* NetBSD a.out. */
|
||
|
||
static void
|
||
i386nbsdaout_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
|
||
{
|
||
i386nbsd_init_abi (info, gdbarch);
|
||
|
||
/* NetBSD a.out has a single register set. */
|
||
set_gdbarch_regset_from_core_section
|
||
(gdbarch, i386nbsd_aout_regset_from_core_section);
|
||
}
|
||
|
||
/* NetBSD ELF. */
|
||
|
||
static void
|
||
i386nbsdelf_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
|
||
{
|
||
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
|
||
|
||
/* It's still NetBSD. */
|
||
i386nbsd_init_abi (info, gdbarch);
|
||
|
||
/* But ELF-based. */
|
||
i386_elf_init_abi (info, gdbarch);
|
||
|
||
/* NetBSD ELF uses SVR4-style shared libraries. */
|
||
set_solib_svr4_fetch_link_map_offsets
|
||
(gdbarch, svr4_ilp32_fetch_link_map_offsets);
|
||
|
||
/* NetBSD ELF uses -fpcc-struct-return by default. */
|
||
tdep->struct_return = pcc_struct_return;
|
||
}
|
||
|
||
static enum gdb_osabi
|
||
i386nbsd_elf_osabi_sniffer (bfd *abfd)
|
||
{
|
||
if (strcmp (bfd_get_target (abfd), "elf32-i386") != 0)
|
||
return GDB_OSABI_UNKNOWN;
|
||
/* disgusting hack since kernels don't have a PT_NOTE section */
|
||
if ((unsigned long)elf_elfheader (abfd)->e_entry != (unsigned long)0xc0100000)
|
||
return GDB_OSABI_UNKNOWN;
|
||
|
||
return GDB_OSABI_NETBSD_ELF;
|
||
}
|
||
|
||
|
||
void
|
||
_initialize_i386nbsd_tdep (void)
|
||
{
|
||
gdbarch_register_osabi_sniffer (bfd_arch_i386, bfd_target_elf_flavour,
|
||
i386nbsd_elf_osabi_sniffer);
|
||
gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_NETBSD_AOUT,
|
||
i386nbsdaout_init_abi);
|
||
gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_NETBSD_ELF,
|
||
i386nbsdelf_init_abi);
|
||
}
|