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/* Target-dependent code for i386 BSD's.
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Copyright (C) 2001-2022 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 "osabi.h"
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#include "i386-tdep.h"
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/* Support for signal handlers. */
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/* Assuming THIS_FRAME is for a BSD sigtramp routine, return the
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address of the associated sigcontext structure. */
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static CORE_ADDR
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i386bsd_sigcontext_addr (struct frame_info *this_frame)
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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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gdb_byte buf[4];
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CORE_ADDR sp;
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get_frame_register (this_frame, I386_ESP_REGNUM, buf);
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sp = extract_unsigned_integer (buf, 4, byte_order);
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return read_memory_unsigned_integer (sp + 8, 4, byte_order);
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}
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/* Support for shared libraries. */
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/* Traditional BSD (4.3 BSD, still used for BSDI and 386BSD). */
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/* From <machine/signal.h>. */
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int i386bsd_sc_reg_offset[] =
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{
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-1, /* %eax */
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-1, /* %ecx */
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-1, /* %edx */
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-1, /* %ebx */
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8 + 0 * 4, /* %esp */
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8 + 1 * 4, /* %ebp */
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-1, /* %esi */
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-1, /* %edi */
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8 + 3 * 4, /* %eip */
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8 + 4 * 4, /* %eflags */
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-1, /* %cs */
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-1, /* %ss */
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-1, /* %ds */
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-1, /* %es */
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-1, /* %fs */
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-1 /* %gs */
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};
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void
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i386bsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
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{
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i386_gdbarch_tdep *tdep = (i386_gdbarch_tdep *) gdbarch_tdep (gdbarch);
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tdep->jb_pc_offset = 0;
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tdep->sigtramp_start = 0xfdbfdfc0;
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tdep->sigtramp_end = 0xfdbfe000;
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tdep->sigcontext_addr = i386bsd_sigcontext_addr;
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tdep->sc_reg_offset = i386bsd_sc_reg_offset;
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tdep->sc_num_regs = ARRAY_SIZE (i386bsd_sc_reg_offset);
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}
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