| /* Target-dependent code for Motorola 68000 BSD's. |
| |
| Copyright (C) 2004-2021 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 "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 = regcache->arch (); |
| const gdb_byte *regs = (const gdb_byte *) 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 (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 = (const gdb_byte *) 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 (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 const struct regset m68kbsd_gregset = |
| { |
| NULL, |
| m68kbsd_supply_gregset, |
| NULL, |
| REGSET_VARIABLE_SIZE |
| }; |
| |
| static const struct regset m68kbsd_fpregset = |
| { |
| NULL, |
| m68kbsd_supply_fpregset |
| }; |
| |
| /* Iterate over core file register note sections. */ |
| |
| static void |
| m68kbsd_iterate_over_regset_sections (struct gdbarch *gdbarch, |
| iterate_over_regset_sections_cb *cb, |
| void *cb_data, |
| const struct regcache *regcache) |
| { |
| cb (".reg", M68KBSD_SIZEOF_GREGS, M68KBSD_SIZEOF_GREGS, &m68kbsd_gregset, |
| NULL, cb_data); |
| cb (".reg2", M68KBSD_SIZEOF_FPREGS, M68KBSD_SIZEOF_FPREGS, &m68kbsd_fpregset, |
| NULL, cb_data); |
| } |
| |
| |
| 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_iterate_over_regset_sections |
| (gdbarch, m68kbsd_iterate_over_regset_sections); |
| |
| /* 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); |
| } |
| |
| void _initialize_m68kbsd_tdep (); |
| void |
| _initialize_m68kbsd_tdep () |
| { |
| gdbarch_register_osabi (bfd_arch_m68k, 0, GDB_OSABI_NETBSD, |
| m68kbsd_init_abi); |
| } |