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433 lines
11 KiB
C
433 lines
11 KiB
C
/* Target-dependent code for NetBSD/i386.
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Copyright (C) 1988-2021 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 "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 "trad-frame.h"
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#include "tramp-frame.h"
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#include "i386-tdep.h"
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#include "i387-tdep.h"
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#include "netbsd-tdep.h"
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#include "solib-svr4.h"
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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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/* From <machine/signal.h>. */
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static 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 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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/* leal 0x10(%esp), %eax */
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{ 0x8d, ULONGEST_MAX },
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{ 0x44, ULONGEST_MAX },
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{ 0x24, ULONGEST_MAX },
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{ 0x10, ULONGEST_MAX },
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/* pushl %eax */
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{ 0x50, ULONGEST_MAX },
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/* pushl %eax */
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{ 0x50, ULONGEST_MAX },
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/* movl $0x127, %eax # __sigreturn14 */
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{ 0xb8, ULONGEST_MAX },
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{ 0x27, ULONGEST_MAX },
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{0x01, ULONGEST_MAX },
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{0x00, ULONGEST_MAX },
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{0x00, ULONGEST_MAX },
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/* int $0x80 */
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{ 0xcd, ULONGEST_MAX },
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{ 0x80, ULONGEST_MAX},
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/* movl $0x1, %eax # exit */
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{ 0xb8, ULONGEST_MAX },
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{ 0x01, ULONGEST_MAX },
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{0x00, ULONGEST_MAX },
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{0x00, ULONGEST_MAX },
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{0x00, ULONGEST_MAX },
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/* int $0x80 */
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{ 0xcd, ULONGEST_MAX },
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{ 0x80, ULONGEST_MAX},
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{ TRAMP_SENTINEL_INSN, ULONGEST_MAX }
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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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/* leal 0x0c(%esp), %eax */
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{ 0x8d, ULONGEST_MAX },
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{ 0x44, ULONGEST_MAX },
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{ 0x24, ULONGEST_MAX },
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{ 0x0c, ULONGEST_MAX },
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/* movl %eax, 0x4(%esp) */
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{ 0x89, ULONGEST_MAX },
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{ 0x44, ULONGEST_MAX },
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{ 0x24, ULONGEST_MAX },
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{ 0x04, ULONGEST_MAX },
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/* movl $0x127, %eax # __sigreturn14 */
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{ 0xb8, ULONGEST_MAX },
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{ 0x27, ULONGEST_MAX },
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{0x01, ULONGEST_MAX },
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{0x00, ULONGEST_MAX },
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{0x00, ULONGEST_MAX },
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/* int $0x80 */
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{ 0xcd, ULONGEST_MAX },
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{ 0x80, ULONGEST_MAX},
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/* movl %eax, 0x4(%esp) */
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{ 0x89, ULONGEST_MAX },
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{ 0x44, ULONGEST_MAX },
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{ 0x24, ULONGEST_MAX },
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{ 0x04, ULONGEST_MAX },
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/* movl $0x1, %eax */
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{ 0xb8, ULONGEST_MAX },
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{ 0x01, ULONGEST_MAX },
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{0x00, ULONGEST_MAX },
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{0x00, ULONGEST_MAX },
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{0x00, ULONGEST_MAX },
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/* int $0x80 */
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{ 0xcd, ULONGEST_MAX },
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{ 0x80, ULONGEST_MAX},
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{ TRAMP_SENTINEL_INSN, ULONGEST_MAX }
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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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/* movl 8(%esp),%eax */
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{ 0x8b, ULONGEST_MAX },
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{ 0x44, ULONGEST_MAX },
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{ 0x24, ULONGEST_MAX },
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{ 0x08, ULONGEST_MAX },
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/* movl %eax, 0x4(%esp) */
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{ 0x89, ULONGEST_MAX },
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{ 0x44, ULONGEST_MAX },
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{ 0x24, ULONGEST_MAX },
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{ 0x04, ULONGEST_MAX },
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/* movl $0x134, %eax # setcontext */
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{ 0xb8, ULONGEST_MAX },
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{ 0x34, ULONGEST_MAX },
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{ 0x01, ULONGEST_MAX },
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{ 0x00, ULONGEST_MAX },
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{ 0x00, ULONGEST_MAX },
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/* int $0x80 */
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{ 0xcd, ULONGEST_MAX },
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{ 0x80, ULONGEST_MAX },
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/* movl %eax, 0x4(%esp) */
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{ 0x89, ULONGEST_MAX },
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{ 0x44, ULONGEST_MAX },
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{ 0x24, ULONGEST_MAX },
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{ 0x04, ULONGEST_MAX },
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/* movl $0x1, %eax */
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{ 0xb8, ULONGEST_MAX },
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{ 0x01, ULONGEST_MAX },
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{ 0x00, ULONGEST_MAX },
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{ 0x00, ULONGEST_MAX },
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{ 0x00, ULONGEST_MAX },
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/* int $0x80 */
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{ 0xcd, ULONGEST_MAX },
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{ 0x80, ULONGEST_MAX },
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{ TRAMP_SENTINEL_INSN, ULONGEST_MAX }
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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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/* leal 0x8c(%esp), %eax */
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{ 0x8d, ULONGEST_MAX },
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{ 0x84, ULONGEST_MAX },
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{ 0x24, ULONGEST_MAX },
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{ 0x8c, ULONGEST_MAX },
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{ 0x00, ULONGEST_MAX },
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{ 0x00, ULONGEST_MAX },
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{ 0x00, ULONGEST_MAX },
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/* movl %eax, 0x4(%esp) */
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{ 0x89, ULONGEST_MAX },
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{ 0x44, ULONGEST_MAX },
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{ 0x24, ULONGEST_MAX },
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{ 0x04, ULONGEST_MAX },
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/* movl $0x134, %eax # setcontext */
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{ 0xb8, ULONGEST_MAX },
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{ 0x34, ULONGEST_MAX },
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{ 0x01, ULONGEST_MAX },
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{ 0x00, ULONGEST_MAX },
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{ 0x00, ULONGEST_MAX },
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/* int $0x80 */
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{ 0xcd, ULONGEST_MAX },
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{ 0x80, ULONGEST_MAX},
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/* movl %eax, 0x4(%esp) */
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{ 0x89, ULONGEST_MAX },
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{ 0x44, ULONGEST_MAX },
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{ 0x24, ULONGEST_MAX },
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{ 0x04, ULONGEST_MAX },
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/* movl $0x1, %eax */
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{ 0xb8, ULONGEST_MAX },
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{ 0x01, ULONGEST_MAX },
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{0x00, ULONGEST_MAX },
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{0x00, ULONGEST_MAX },
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{0x00, ULONGEST_MAX },
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/* int $0x80 */
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{ 0xcd, ULONGEST_MAX },
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{ 0x80, ULONGEST_MAX},
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{ TRAMP_SENTINEL_INSN, ULONGEST_MAX }
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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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/* leal 0x8c(%esp), %eax */
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{ 0x8d, ULONGEST_MAX },
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{ 0x84, ULONGEST_MAX },
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{ 0x24, ULONGEST_MAX },
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{ 0x8c, ULONGEST_MAX },
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{ 0x00, ULONGEST_MAX },
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{ 0x00, ULONGEST_MAX },
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{ 0x00, ULONGEST_MAX },
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/* movl %eax, 0x4(%esp) */
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{ 0x89, ULONGEST_MAX },
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{ 0x44, ULONGEST_MAX },
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{ 0x24, ULONGEST_MAX },
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{ 0x04, ULONGEST_MAX },
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/* movl $0x134, %eax # setcontext */
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{ 0xb8, ULONGEST_MAX },
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{ 0x34, ULONGEST_MAX },
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{ 0x01, ULONGEST_MAX },
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{ 0x00, ULONGEST_MAX },
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{ 0x00, ULONGEST_MAX },
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/* int $0x80 */
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{ 0xcd, ULONGEST_MAX },
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{ 0x80, ULONGEST_MAX},
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/* movl $0xffffffff,0x4(%esp) */
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{ 0xc7, ULONGEST_MAX },
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{ 0x44, ULONGEST_MAX },
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{ 0x24, ULONGEST_MAX },
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{ 0x04, ULONGEST_MAX },
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{ 0xff, ULONGEST_MAX },
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{ 0xff, ULONGEST_MAX },
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{ 0xff, ULONGEST_MAX },
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{ 0xff, ULONGEST_MAX },
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/* movl $0x1, %eax */
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{ 0xb8, ULONGEST_MAX },
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{ 0x01, ULONGEST_MAX },
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{0x00, ULONGEST_MAX },
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{0x00, ULONGEST_MAX },
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{0x00, ULONGEST_MAX },
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/* int $0x80 */
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{ 0xcd, ULONGEST_MAX },
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{ 0x80, ULONGEST_MAX},
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{ TRAMP_SENTINEL_INSN, ULONGEST_MAX }
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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 *this_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 (this_frame);
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enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
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CORE_ADDR sp = get_frame_register_unsigned (this_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, byte_order);
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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, byte_order);
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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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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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nbsd_init_abi (info, gdbarch);
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/* NetBSD has a different `struct reg'. */
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tdep->gregset_reg_offset = i386nbsd_r_reg_offset;
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tdep->gregset_num_regs = ARRAY_SIZE (i386nbsd_r_reg_offset);
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tdep->sizeof_gregset = 16 * 4;
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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 uses tramp_frame sniffers for signal trampolines. */
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tdep->sigcontext_addr= 0;
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tdep->sigtramp_start = 0;
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tdep->sigtramp_end = 0;
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tdep->sigtramp_p = 0;
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tdep->sc_reg_offset = 0;
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tdep->sc_num_regs = 0;
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tramp_frame_prepend_unwinder (gdbarch, &i386nbsd_sigtramp_sc16);
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tramp_frame_prepend_unwinder (gdbarch, &i386nbsd_sigtramp_sc2);
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tramp_frame_prepend_unwinder (gdbarch, &i386nbsd_sigtramp_si2);
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tramp_frame_prepend_unwinder (gdbarch, &i386nbsd_sigtramp_si31);
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tramp_frame_prepend_unwinder (gdbarch, &i386nbsd_sigtramp_si4);
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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_solib_svr4_fetch_link_map_offsets
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(gdbarch, svr4_ilp32_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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}
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void _initialize_i386nbsd_tdep ();
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void
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_initialize_i386nbsd_tdep ()
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{
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gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_NETBSD,
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i386nbsdelf_init_abi);
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}
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