mirror of
https://sourceware.org/git/binutils-gdb.git
synced 2024-11-27 03:51:15 +08:00
277 lines
7.7 KiB
C
277 lines
7.7 KiB
C
/* Target-dependent code for Motorola 68000 BSD's.
|
||
|
||
Copyright (C) 2004, 2005, 2007, 2008, 2009, 2010, 2011
|
||
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 3 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, see <http://www.gnu.org/licenses/>. */
|
||
|
||
#include "defs.h"
|
||
#include "arch-utils.h"
|
||
#include "frame.h"
|
||
#include "osabi.h"
|
||
#include "regcache.h"
|
||
#include "regset.h"
|
||
#include "trad-frame.h"
|
||
#include "tramp-frame.h"
|
||
#include "gdbtypes.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 (struct gdbarch *gdbarch, int regnum)
|
||
{
|
||
int fp_len = TYPE_LENGTH (gdbarch_register_type (gdbarch, regnum));
|
||
|
||
if (regnum >= M68K_FPC_REGNUM)
|
||
return 8 * fp_len + (regnum - M68K_FPC_REGNUM) * 4;
|
||
|
||
return (regnum - M68K_FP0_REGNUM) * fp_len;
|
||
}
|
||
|
||
/* 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)
|
||
{
|
||
struct gdbarch *gdbarch = get_regcache_arch (regcache);
|
||
const gdb_byte *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 (gdbarch, 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 gdb_byte *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;
|
||
}
|
||
|
||
|
||
/* Signal trampolines. */
|
||
|
||
static void
|
||
m68kobsd_sigtramp_cache_init (const struct tramp_frame *self,
|
||
struct frame_info *this_frame,
|
||
struct trad_frame_cache *this_cache,
|
||
CORE_ADDR func)
|
||
{
|
||
CORE_ADDR addr, base, pc;
|
||
int regnum;
|
||
|
||
base = get_frame_register_unsigned (this_frame, M68K_SP_REGNUM);
|
||
|
||
/* The 'addql #4,%sp' instruction at offset 8 adjusts the stack
|
||
pointer. Adjust the frame base accordingly. */
|
||
pc = get_frame_register_unsigned (this_frame, M68K_PC_REGNUM);
|
||
if ((pc - func) > 8)
|
||
base -= 4;
|
||
|
||
/* Get frame pointer, stack pointer, program counter and processor
|
||
state from `struct sigcontext'. */
|
||
addr = get_frame_memory_unsigned (this_frame, base + 8, 4);
|
||
trad_frame_set_reg_addr (this_cache, M68K_FP_REGNUM, addr + 8);
|
||
trad_frame_set_reg_addr (this_cache, M68K_SP_REGNUM, addr + 12);
|
||
trad_frame_set_reg_addr (this_cache, M68K_PC_REGNUM, addr + 20);
|
||
trad_frame_set_reg_addr (this_cache, M68K_PS_REGNUM, addr + 24);
|
||
|
||
/* The sc_ap member of `struct sigcontext' points to additional
|
||
hardware state. Here we find the missing registers. */
|
||
addr = get_frame_memory_unsigned (this_frame, addr + 16, 4) + 4;
|
||
for (regnum = M68K_D0_REGNUM; regnum < M68K_FP_REGNUM; regnum++, addr += 4)
|
||
trad_frame_set_reg_addr (this_cache, regnum, addr);
|
||
|
||
/* Construct the frame ID using the function start. */
|
||
trad_frame_set_id (this_cache, frame_id_build (base, func));
|
||
}
|
||
|
||
static const struct tramp_frame m68kobsd_sigtramp = {
|
||
SIGTRAMP_FRAME,
|
||
2,
|
||
{
|
||
{ 0x206f, -1 }, { 0x000c, -1}, /* moveal %sp@(12),%a0 */
|
||
{ 0x4e90, -1 }, /* jsr %a0@ */
|
||
{ 0x588f, -1 }, /* addql #4,%sp */
|
||
{ 0x4e41, -1 }, /* trap #1 */
|
||
{ 0x2f40, -1 }, { 0x0004, -1 }, /* moveal %d0,%sp@(4) */
|
||
{ 0x7001, -1 }, /* moveq #SYS_exit,%d0 */
|
||
{ 0x4e40, -1 }, /* trap #0 */
|
||
{ TRAMP_SENTINEL_INSN, -1 }
|
||
},
|
||
m68kobsd_sigtramp_cache_init
|
||
};
|
||
|
||
|
||
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_decr_pc_after_break (gdbarch, 2);
|
||
|
||
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;
|
||
|
||
tramp_frame_prepend_unwinder (gdbarch, &m68kobsd_sigtramp);
|
||
}
|
||
|
||
/* 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_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);
|
||
}
|