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Add OpenBSD/m68k support.
* NEWS (New native configurations): Mention OpenBSD/m68k. * m68kbsd-tdep.c: New file. * m68kbsd-nat.c: New file. * Makefile.in (ALLDEPFILES): Add m68kbsd-nat.c and m68kbsd-tdep.c. (m68kbsd-nat.o, m68kbsd-tdep.o): New dependencies. * configure.host: Add m68k-*-openbsd. * configure.tgt: Add m68k-*-openbsd. * config/m68k/tm-obsd.h: New file. * config/m68k/obsd.mt: New file. * config/m68k/obsd.mh: New file. * config/djgpp/fnchange.lst: Add entries for m68kbsd-nat.c and m68kbsd-tdep.c.
This commit is contained in:
Mark Kettenis
226
gdb/m68kbsd-tdep.c
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226
gdb/m68kbsd-tdep.c
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/* Target-dependent code for Motorola 68000 BSD's.
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Copyright 2004 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 2 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, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include "defs.h"
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#include "arch-utils.h"
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#include "osabi.h"
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#include "regcache.h"
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#include "regset.h"
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#include "gdb_assert.h"
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#include "gdb_string.h"
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#include "m68k-tdep.h"
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#include "solib-svr4.h"
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/* Core file support. */
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/* Sizeof `struct reg' in <machine/reg.h>. */
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#define M68KBSD_SIZEOF_GREGS (18 * 4)
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/* Sizeof `struct fpreg' in <machine/reg.h. */
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#define M68KBSD_SIZEOF_FPREGS (((8 * 3) + 3) * 4)
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int
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m68kbsd_fpreg_offset (int regnum)
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{
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if (regnum >= M68K_FPC_REGNUM)
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return 8 * 12 + (regnum - M68K_FPC_REGNUM) * 4;
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return (regnum - M68K_FP0_REGNUM) * 12;
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}
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/* Supply register REGNUM from the buffer specified by FPREGS and LEN
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in the floating-point register set REGSET to register cache
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REGCACHE. If REGNUM is -1, do this for all registers in REGSET. */
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static void
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m68kbsd_supply_fpregset (const struct regset *regset,
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struct regcache *regcache,
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int regnum, const void *fpregs, size_t len)
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{
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const char *regs = fpregs;
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int i;
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gdb_assert (len >= M68KBSD_SIZEOF_FPREGS);
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for (i = M68K_FP0_REGNUM; i <= M68K_PC_REGNUM; i++)
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{
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if (regnum == i || regnum == -1)
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regcache_raw_supply (regcache, i, regs + m68kbsd_fpreg_offset (i));
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}
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}
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/* Supply register REGNUM from the buffer specified by GREGS and LEN
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in the general-purpose register set REGSET to register cache
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REGCACHE. If REGNUM is -1, do this for all registers in REGSET. */
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static void
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m68kbsd_supply_gregset (const struct regset *regset,
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struct regcache *regcache,
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int regnum, const void *gregs, size_t len)
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{
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const char *regs = gregs;
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int i;
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gdb_assert (len >= M68KBSD_SIZEOF_GREGS);
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for (i = M68K_D0_REGNUM; i <= M68K_PC_REGNUM; i++)
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{
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if (regnum == i || regnum == -1)
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regcache_raw_supply (regcache, i, regs + i * 4);
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}
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if (len >= M68KBSD_SIZEOF_GREGS + M68KBSD_SIZEOF_FPREGS)
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{
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regs += M68KBSD_SIZEOF_GREGS;
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len -= M68KBSD_SIZEOF_GREGS;
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m68kbsd_supply_fpregset (regset, regcache, regnum, regs, len);
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}
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}
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/* Motorola 68000 register sets. */
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static struct regset m68kbsd_gregset =
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{
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NULL,
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m68kbsd_supply_gregset
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};
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static struct regset m68kbsd_fpregset =
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{
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NULL,
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m68kbsd_supply_fpregset
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};
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/* Return the appropriate register set for the core section identified
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by SECT_NAME and SECT_SIZE. */
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static const struct regset *
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m68kbsd_regset_from_core_section (struct gdbarch *gdbarch,
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const char *sect_name, size_t sect_size)
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{
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if (strcmp (sect_name, ".reg") == 0 && sect_size >= M68KBSD_SIZEOF_GREGS)
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return &m68kbsd_gregset;
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if (strcmp (sect_name, ".reg2") == 0 && sect_size >= M68KBSD_SIZEOF_FPREGS)
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return &m68kbsd_fpregset;
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return NULL;
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}
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/* Support for shared libraries. */
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/* Return non-zero if we are in a shared library trampoline code stub. */
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int
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m68kbsd_aout_in_solib_call_trampoline (CORE_ADDR pc, char *name)
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{
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return (name && !strcmp (name, "_DYNAMIC"));
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}
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static void
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m68kbsd_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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tdep->jb_pc = 5;
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tdep->jb_elt_size = 4;
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set_gdbarch_regset_from_core_section
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(gdbarch, m68kbsd_regset_from_core_section);
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}
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/* OpenBSD and NetBSD a.out. */
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static void
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m68kbsd_aout_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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m68kbsd_init_abi (info, gdbarch);
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tdep->struct_return = reg_struct_return;
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/* Assume SunOS-style shared libraries. */
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set_gdbarch_in_solib_call_trampoline
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(gdbarch, m68kbsd_aout_in_solib_call_trampoline);
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}
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/* NetBSD ELF. */
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static void
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m68kbsd_elf_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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m68kbsd_init_abi (info, gdbarch);
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tdep->struct_return = pcc_struct_return;
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/* NetBSD ELF uses SVR4-style shared libraries. */
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set_gdbarch_in_solib_call_trampoline
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(gdbarch, generic_in_solib_call_trampoline);
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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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}
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static enum gdb_osabi
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m68kbsd_aout_osabi_sniffer (bfd *abfd)
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{
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if (strcmp (bfd_get_target (abfd), "a.out-m68k-netbsd") == 0
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|| strcmp (bfd_get_target (abfd), "a.out-m68k4k-netbsd") == 0)
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return GDB_OSABI_NETBSD_AOUT;
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return GDB_OSABI_UNKNOWN;
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}
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static enum gdb_osabi
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m68kbsd_core_osabi_sniffer (bfd *abfd)
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{
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if (strcmp (bfd_get_target (abfd), "netbsd-core") == 0)
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return GDB_OSABI_NETBSD_AOUT;
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return GDB_OSABI_UNKNOWN;
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}
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/* Provide a prototype to silence -Wmissing-prototypes. */
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void _initialize_m68kbsd_tdep (void);
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void
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_initialize_m68kbsd_tdep (void)
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{
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gdbarch_register_osabi_sniffer (bfd_arch_m68k, bfd_target_aout_flavour,
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m68kbsd_aout_osabi_sniffer);
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/* BFD doesn't set a flavour for NetBSD style a.out core files. */
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gdbarch_register_osabi_sniffer (bfd_arch_m68k, bfd_target_unknown_flavour,
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m68kbsd_core_osabi_sniffer);
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gdbarch_register_osabi (bfd_arch_m68k, 0, GDB_OSABI_NETBSD_AOUT,
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m68kbsd_aout_init_abi);
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gdbarch_register_osabi (bfd_arch_m68k, 0, GDB_OSABI_NETBSD_ELF,
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m68kbsd_elf_init_abi);
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}
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