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/* Target-dependent code for i386 BSD's.
Copyright 2001, 2002 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include "defs.h"
#include "arch-utils.h"
#include "frame.h"
#include "gdbcore.h"
#include "regcache.h"
#include "i386-tdep.h"
/* Support for signal handlers. */
/* Return whether PC is in a BSD sigtramp routine. */
static int
i386bsd_pc_in_sigtramp (CORE_ADDR pc, char *name)
{
struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
return (pc >= tdep->sigtramp_start && pc < tdep->sigtramp_end);
}
/* Assuming FRAME is for a BSD sigtramp routine, return the address of
the associated sigcontext structure. */
static CORE_ADDR
i386bsd_sigcontext_addr (struct frame_info *frame)
{
if (frame->next)
/* If this isn't the top frame, the next frame must be for the
signal handler itself. A pointer to the sigcontext structure
is passed as the third argument to the signal handler. */
return read_memory_unsigned_integer (frame->next->frame + 16, 4);
/* This is the top frame. We'll have to find the address of the
sigcontext structure by looking at the stack pointer. */
return read_memory_unsigned_integer (read_register (SP_REGNUM) + 8, 4);
}
/* Assuming FRAME is for a BSD sigtramp routine, return the saved
program counter.
Note: This function is used for Solaris 2 too, so don't make it
static. */
CORE_ADDR
i386bsd_sigtramp_saved_pc (struct frame_info *frame)
{
int sc_pc_offset = gdbarch_tdep (current_gdbarch)->sc_pc_offset;
CORE_ADDR addr;
addr = i386bsd_sigcontext_addr (frame);
return read_memory_unsigned_integer (addr + sc_pc_offset, 4);
}
/* Return the start address of the sigtramp routine. */
CORE_ADDR
i386bsd_sigtramp_start (CORE_ADDR pc)
{
return gdbarch_tdep (current_gdbarch)->sigtramp_start;
}
/* Return the end address of the sigtramp routine. */
CORE_ADDR
i386bsd_sigtramp_end (CORE_ADDR pc)
{
return gdbarch_tdep (current_gdbarch)->sigtramp_end;
}
/* Support for shared libraries. */
/* Return non-zero if we are in a shared library trampoline code stub. */
int
i386bsd_aout_in_solib_call_trampoline (CORE_ADDR pc, char *name)
{
return (name && !strcmp (name, "_DYNAMIC"));
}
/* Traditional BSD (4.3 BSD, still used for BSDI and 386BSD). */
/* From <machine/signal.h>. */
int i386bsd_sc_pc_offset = 20;
static void
i386bsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
{
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
set_gdbarch_pc_in_sigtramp (gdbarch, i386bsd_pc_in_sigtramp);
/* Assume SunOS-style shared libraries. */
set_gdbarch_in_solib_call_trampoline (gdbarch,
i386bsd_aout_in_solib_call_trampoline);
tdep->jb_pc_offset = 0;
tdep->sigtramp_saved_pc = i386bsd_sigtramp_saved_pc;
tdep->sigtramp_start = 0xfdbfdfc0;
tdep->sigtramp_end = 0xfdbfe000;
tdep->sc_pc_offset = i386bsd_sc_pc_offset;
}
/* NetBSD 1.0 or later. */
/* From <machine/signal.h>. */
int i386nbsd_sc_pc_offset = 44;
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 uses -freg-struct-return by default. */
tdep->struct_return = reg_struct_return;
/* NetBSD uses a different memory layout. */
tdep->sigtramp_start = 0xbfbfdf20;
tdep->sigtramp_end = 0xbfbfdff0;
/* NetBSD has a `struct sigcontext' that's different from the
origional 4.3 BSD. */
tdep->sc_pc_offset = i386nbsd_sc_pc_offset;
}
/* 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_gdbarch_in_solib_call_trampoline (gdbarch,
generic_in_solib_call_trampoline);
/* NetBSD ELF uses -fpcc-struct-return by default. */
tdep->struct_return = pcc_struct_return;
/* We support the SSE registers on NetBSD ELF. */
tdep->num_xmm_regs = I386_NUM_XREGS - 1;
set_gdbarch_num_regs (gdbarch, I386_NUM_GREGS + I386_NUM_FREGS
+ I386_NUM_XREGS);
}
/* FreeBSD 3.0-RELEASE or later. */
CORE_ADDR i386fbsd_sigtramp_start = 0xbfbfdf20;
CORE_ADDR i386fbsd_sigtramp_end = 0xbfbfdff0;
static void
i386fbsdaout_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
{
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
/* Obviously FreeBSD is BSD-based. */
i386bsd_init_abi (info, gdbarch);
/* FreeBSD uses -freg-struct-return by default. */
tdep->struct_return = reg_struct_return;
/* FreeBSD uses a different memory layout. */
tdep->sigtramp_start = i386fbsd_sigtramp_start;
tdep->sigtramp_end = i386fbsd_sigtramp_end;
}
static void
i386fbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
{
/* It's almost identical to FreeBSD a.out. */
i386fbsdaout_init_abi (info, gdbarch);
/* Except that it uses ELF. */
i386_elf_init_abi (info, gdbarch);
/* FreeBSD ELF uses SVR4-style shared libraries. */
set_gdbarch_in_solib_call_trampoline (gdbarch,
generic_in_solib_call_trampoline);
}
/* FreeBSD 4.0-RELEASE or later. */
/* From <machine/signal.h>. */
int i386fbsd4_sc_pc_offset = 76;
static void
i386fbsd4_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
{
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
/* Inherit stuff from older releases. We assume that FreeBSD
4.0-RELEASE always uses ELF. */
i386fbsd_init_abi (info, gdbarch);
/* FreeBSD 4.0 introduced a new `struct sigcontext'. */
tdep->sc_pc_offset = i386fbsd4_sc_pc_offset;
}
static enum gdb_osabi
i386bsd_aout_osabi_sniffer (bfd *abfd)
{
if (strcmp (bfd_get_target (abfd), "a.out-i386-netbsd") == 0)
return GDB_OSABI_NETBSD_AOUT;
if (strcmp (bfd_get_target (abfd), "a.out-i386-freebsd") == 0)
return GDB_OSABI_FREEBSD_AOUT;
return GDB_OSABI_UNKNOWN;
}
/* Provide a prototype to silence -Wmissing-prototypes. */
void _initialize_i386bsd_tdep (void);
void
_initialize_i386bsd_tdep (void)
{
gdbarch_register_osabi_sniffer (bfd_arch_i386, bfd_target_aout_flavour,
i386bsd_aout_osabi_sniffer);
gdbarch_register_osabi (bfd_arch_i386, GDB_OSABI_NETBSD_AOUT,
i386nbsd_init_abi);
gdbarch_register_osabi (bfd_arch_i386, GDB_OSABI_NETBSD_ELF,
i386nbsdelf_init_abi);
gdbarch_register_osabi (bfd_arch_i386, GDB_OSABI_FREEBSD_AOUT,
i386fbsdaout_init_abi);
gdbarch_register_osabi (bfd_arch_i386, GDB_OSABI_FREEBSD_ELF,
i386fbsd4_init_abi);
}
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