| 1 | /* Target-dependent code for Motorola 68000 BSD's. |
| 2 | |
| 3 | Copyright (C) 2004-2018 Free Software Foundation, Inc. |
| 4 | |
| 5 | This file is part of GDB. |
| 6 | |
| 7 | This program is free software; you can redistribute it and/or modify |
| 8 | it under the terms of the GNU General Public License as published by |
| 9 | the Free Software Foundation; either version 3 of the License, or |
| 10 | (at your option) any later version. |
| 11 | |
| 12 | This program is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | GNU General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 19 | |
| 20 | #include "defs.h" |
| 21 | #include "arch-utils.h" |
| 22 | #include "frame.h" |
| 23 | #include "osabi.h" |
| 24 | #include "regcache.h" |
| 25 | #include "regset.h" |
| 26 | #include "trad-frame.h" |
| 27 | #include "tramp-frame.h" |
| 28 | #include "gdbtypes.h" |
| 29 | |
| 30 | #include "m68k-tdep.h" |
| 31 | #include "solib-svr4.h" |
| 32 | |
| 33 | /* Core file support. */ |
| 34 | |
| 35 | /* Sizeof `struct reg' in <machine/reg.h>. */ |
| 36 | #define M68KBSD_SIZEOF_GREGS (18 * 4) |
| 37 | |
| 38 | /* Sizeof `struct fpreg' in <machine/reg.h. */ |
| 39 | #define M68KBSD_SIZEOF_FPREGS (((8 * 3) + 3) * 4) |
| 40 | |
| 41 | int |
| 42 | m68kbsd_fpreg_offset (struct gdbarch *gdbarch, int regnum) |
| 43 | { |
| 44 | int fp_len = TYPE_LENGTH (gdbarch_register_type (gdbarch, regnum)); |
| 45 | |
| 46 | if (regnum >= M68K_FPC_REGNUM) |
| 47 | return 8 * fp_len + (regnum - M68K_FPC_REGNUM) * 4; |
| 48 | |
| 49 | return (regnum - M68K_FP0_REGNUM) * fp_len; |
| 50 | } |
| 51 | |
| 52 | /* Supply register REGNUM from the buffer specified by FPREGS and LEN |
| 53 | in the floating-point register set REGSET to register cache |
| 54 | REGCACHE. If REGNUM is -1, do this for all registers in REGSET. */ |
| 55 | |
| 56 | static void |
| 57 | m68kbsd_supply_fpregset (const struct regset *regset, |
| 58 | struct regcache *regcache, |
| 59 | int regnum, const void *fpregs, size_t len) |
| 60 | { |
| 61 | struct gdbarch *gdbarch = regcache->arch (); |
| 62 | const gdb_byte *regs = (const gdb_byte *) fpregs; |
| 63 | int i; |
| 64 | |
| 65 | gdb_assert (len >= M68KBSD_SIZEOF_FPREGS); |
| 66 | |
| 67 | for (i = M68K_FP0_REGNUM; i <= M68K_PC_REGNUM; i++) |
| 68 | { |
| 69 | if (regnum == i || regnum == -1) |
| 70 | regcache->raw_supply (i, regs + m68kbsd_fpreg_offset (gdbarch, i)); |
| 71 | } |
| 72 | } |
| 73 | |
| 74 | /* Supply register REGNUM from the buffer specified by GREGS and LEN |
| 75 | in the general-purpose register set REGSET to register cache |
| 76 | REGCACHE. If REGNUM is -1, do this for all registers in REGSET. */ |
| 77 | |
| 78 | static void |
| 79 | m68kbsd_supply_gregset (const struct regset *regset, |
| 80 | struct regcache *regcache, |
| 81 | int regnum, const void *gregs, size_t len) |
| 82 | { |
| 83 | const gdb_byte *regs = (const gdb_byte *) gregs; |
| 84 | int i; |
| 85 | |
| 86 | gdb_assert (len >= M68KBSD_SIZEOF_GREGS); |
| 87 | |
| 88 | for (i = M68K_D0_REGNUM; i <= M68K_PC_REGNUM; i++) |
| 89 | { |
| 90 | if (regnum == i || regnum == -1) |
| 91 | regcache->raw_supply (i, regs + i * 4); |
| 92 | } |
| 93 | |
| 94 | if (len >= M68KBSD_SIZEOF_GREGS + M68KBSD_SIZEOF_FPREGS) |
| 95 | { |
| 96 | regs += M68KBSD_SIZEOF_GREGS; |
| 97 | len -= M68KBSD_SIZEOF_GREGS; |
| 98 | m68kbsd_supply_fpregset (regset, regcache, regnum, regs, len); |
| 99 | } |
| 100 | } |
| 101 | |
| 102 | /* Motorola 68000 register sets. */ |
| 103 | |
| 104 | static const struct regset m68kbsd_gregset = |
| 105 | { |
| 106 | NULL, |
| 107 | m68kbsd_supply_gregset, |
| 108 | NULL, |
| 109 | REGSET_VARIABLE_SIZE |
| 110 | }; |
| 111 | |
| 112 | static const struct regset m68kbsd_fpregset = |
| 113 | { |
| 114 | NULL, |
| 115 | m68kbsd_supply_fpregset |
| 116 | }; |
| 117 | |
| 118 | /* Iterate over core file register note sections. */ |
| 119 | |
| 120 | static void |
| 121 | m68kbsd_iterate_over_regset_sections (struct gdbarch *gdbarch, |
| 122 | iterate_over_regset_sections_cb *cb, |
| 123 | void *cb_data, |
| 124 | const struct regcache *regcache) |
| 125 | { |
| 126 | cb (".reg", M68KBSD_SIZEOF_GREGS, &m68kbsd_gregset, NULL, cb_data); |
| 127 | cb (".reg2", M68KBSD_SIZEOF_FPREGS, &m68kbsd_fpregset, NULL, cb_data); |
| 128 | } |
| 129 | \f |
| 130 | |
| 131 | static void |
| 132 | m68kbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) |
| 133 | { |
| 134 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 135 | |
| 136 | tdep->jb_pc = 5; |
| 137 | tdep->jb_elt_size = 4; |
| 138 | |
| 139 | set_gdbarch_decr_pc_after_break (gdbarch, 2); |
| 140 | |
| 141 | set_gdbarch_iterate_over_regset_sections |
| 142 | (gdbarch, m68kbsd_iterate_over_regset_sections); |
| 143 | |
| 144 | /* NetBSD ELF uses the SVR4 ABI. */ |
| 145 | m68k_svr4_init_abi (info, gdbarch); |
| 146 | tdep->struct_return = pcc_struct_return; |
| 147 | |
| 148 | /* NetBSD ELF uses SVR4-style shared libraries. */ |
| 149 | set_solib_svr4_fetch_link_map_offsets |
| 150 | (gdbarch, svr4_ilp32_fetch_link_map_offsets); |
| 151 | } |
| 152 | |
| 153 | void |
| 154 | _initialize_m68kbsd_tdep (void) |
| 155 | { |
| 156 | gdbarch_register_osabi (bfd_arch_m68k, 0, GDB_OSABI_NETBSD, |
| 157 | m68kbsd_init_abi); |
| 158 | } |