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/* Target-dependent code for Motorola 68000 BSD's.
Copyright 2004 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 "osabi.h"
#include "regcache.h"
#include "regset.h"
#include "gdb_assert.h"
#include "gdb_string.h"
#include "m68k-tdep.h"
#include "solib-svr4.h"
/* Core file support. */
/* Sizeof `struct reg' in <machine/reg.h>. */
#define M68KBSD_SIZEOF_GREGS (18 * 4)
/* Sizeof `struct fpreg' in <machine/reg.h. */
#define M68KBSD_SIZEOF_FPREGS (((8 * 3) + 3) * 4)
int
m68kbsd_fpreg_offset (int regnum)
{
if (regnum >= M68K_FPC_REGNUM)
return 8 * 12 + (regnum - M68K_FPC_REGNUM) * 4;
return (regnum - M68K_FP0_REGNUM) * 12;
}
/* Supply register REGNUM from the buffer specified by FPREGS and LEN
in the floating-point register set REGSET to register cache
REGCACHE. If REGNUM is -1, do this for all registers in REGSET. */
static void
m68kbsd_supply_fpregset (const struct regset *regset,
struct regcache *regcache,
int regnum, const void *fpregs, size_t len)
{
const char *regs = fpregs;
int i;
gdb_assert (len >= M68KBSD_SIZEOF_FPREGS);
for (i = M68K_FP0_REGNUM; i <= M68K_PC_REGNUM; i++)
{
if (regnum == i || regnum == -1)
regcache_raw_supply (regcache, i, regs + m68kbsd_fpreg_offset (i));
}
}
/* Supply register REGNUM from the buffer specified by GREGS and LEN
in the general-purpose register set REGSET to register cache
REGCACHE. If REGNUM is -1, do this for all registers in REGSET. */
static void
m68kbsd_supply_gregset (const struct regset *regset,
struct regcache *regcache,
int regnum, const void *gregs, size_t len)
{
const char *regs = gregs;
int i;
gdb_assert (len >= M68KBSD_SIZEOF_GREGS);
for (i = M68K_D0_REGNUM; i <= M68K_PC_REGNUM; i++)
{
if (regnum == i || regnum == -1)
regcache_raw_supply (regcache, i, regs + i * 4);
}
if (len >= M68KBSD_SIZEOF_GREGS + M68KBSD_SIZEOF_FPREGS)
{
regs += M68KBSD_SIZEOF_GREGS;
len -= M68KBSD_SIZEOF_GREGS;
m68kbsd_supply_fpregset (regset, regcache, regnum, regs, len);
}
}
/* Motorola 68000 register sets. */
static struct regset m68kbsd_gregset =
{
NULL,
m68kbsd_supply_gregset
};
static struct regset m68kbsd_fpregset =
{
NULL,
m68kbsd_supply_fpregset
};
/* Return the appropriate register set for the core section identified
by SECT_NAME and SECT_SIZE. */
static const struct regset *
m68kbsd_regset_from_core_section (struct gdbarch *gdbarch,
const char *sect_name, size_t sect_size)
{
if (strcmp (sect_name, ".reg") == 0 && sect_size >= M68KBSD_SIZEOF_GREGS)
return &m68kbsd_gregset;
if (strcmp (sect_name, ".reg2") == 0 && sect_size >= M68KBSD_SIZEOF_FPREGS)
return &m68kbsd_fpregset;
return NULL;
}
/* Support for shared libraries. */
/* Return non-zero if we are in a shared library trampoline code stub. */
int
m68kbsd_aout_in_solib_call_trampoline (CORE_ADDR pc, char *name)
{
return (name && !strcmp (name, "_DYNAMIC"));
}
static void
m68kbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
{
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
tdep->jb_pc = 5;
tdep->jb_elt_size = 4;
set_gdbarch_regset_from_core_section
(gdbarch, m68kbsd_regset_from_core_section);
}
/* OpenBSD and NetBSD a.out. */
static void
m68kbsd_aout_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
{
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
m68kbsd_init_abi (info, gdbarch);
tdep->struct_return = reg_struct_return;
/* Assume SunOS-style shared libraries. */
set_gdbarch_in_solib_call_trampoline
(gdbarch, m68kbsd_aout_in_solib_call_trampoline);
}
/* NetBSD ELF. */
static void
m68kbsd_elf_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
{
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
m68kbsd_init_abi (info, gdbarch);
/* NetBSD ELF uses the SVR4 ABI. */
m68k_svr4_init_abi (info, gdbarch);
tdep->struct_return = pcc_struct_return;
/* NetBSD ELF uses SVR4-style shared libraries. */
set_gdbarch_in_solib_call_trampoline
(gdbarch, generic_in_solib_call_trampoline);
set_solib_svr4_fetch_link_map_offsets
(gdbarch, svr4_ilp32_fetch_link_map_offsets);
}
static enum gdb_osabi
m68kbsd_aout_osabi_sniffer (bfd *abfd)
{
if (strcmp (bfd_get_target (abfd), "a.out-m68k-netbsd") == 0
|| strcmp (bfd_get_target (abfd), "a.out-m68k4k-netbsd") == 0)
return GDB_OSABI_NETBSD_AOUT;
return GDB_OSABI_UNKNOWN;
}
static enum gdb_osabi
m68kbsd_core_osabi_sniffer (bfd *abfd)
{
if (strcmp (bfd_get_target (abfd), "netbsd-core") == 0)
return GDB_OSABI_NETBSD_AOUT;
return GDB_OSABI_UNKNOWN;
}
/* Provide a prototype to silence -Wmissing-prototypes. */
void _initialize_m68kbsd_tdep (void);
void
_initialize_m68kbsd_tdep (void)
{
gdbarch_register_osabi_sniffer (bfd_arch_m68k, bfd_target_aout_flavour,
m68kbsd_aout_osabi_sniffer);
/* BFD doesn't set a flavour for NetBSD style a.out core files. */
gdbarch_register_osabi_sniffer (bfd_arch_m68k, bfd_target_unknown_flavour,
m68kbsd_core_osabi_sniffer);
gdbarch_register_osabi (bfd_arch_m68k, 0, GDB_OSABI_NETBSD_AOUT,
m68kbsd_aout_init_abi);
gdbarch_register_osabi (bfd_arch_m68k, 0, GDB_OSABI_NETBSD_ELF,
m68kbsd_elf_init_abi);
}
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