/* Target-dependent code for Motorola 68000 BSD's. Copyright (C) 2004-2005, 2007-2012 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); }