| /* 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); |
| } |