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Diffstat (limited to 'gdb/m68kbsd-tdep.c')
| -rw-r--r-- | gdb/m68kbsd-tdep.c | 226 |
1 files changed, 226 insertions, 0 deletions
diff --git a/gdb/m68kbsd-tdep.c b/gdb/m68kbsd-tdep.c new file mode 100644 index 00000000000..a9a5b4e564f --- /dev/null +++ b/gdb/m68kbsd-tdep.c @@ -0,0 +1,226 @@ +/* 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); + + 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); +} |