1 /* Target-dependent code for Motorola 68000 BSD's. 2 3 Copyright (C) 2004-2019 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_SIZEOF_GREGS, &m68kbsd_gregset, 127 NULL, cb_data); 128 cb (".reg2", M68KBSD_SIZEOF_FPREGS, M68KBSD_SIZEOF_FPREGS, &m68kbsd_fpregset, 129 NULL, cb_data); 130 } 131 132 133 static void 134 m68kbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) 135 { 136 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); 137 138 tdep->jb_pc = 5; 139 tdep->jb_elt_size = 4; 140 141 set_gdbarch_decr_pc_after_break (gdbarch, 2); 142 143 set_gdbarch_iterate_over_regset_sections 144 (gdbarch, m68kbsd_iterate_over_regset_sections); 145 146 /* NetBSD ELF uses the SVR4 ABI. */ 147 m68k_svr4_init_abi (info, gdbarch); 148 tdep->struct_return = pcc_struct_return; 149 150 /* NetBSD ELF uses SVR4-style shared libraries. */ 151 set_solib_svr4_fetch_link_map_offsets 152 (gdbarch, svr4_ilp32_fetch_link_map_offsets); 153 } 154 155 void 156 _initialize_m68kbsd_tdep (void) 157 { 158 gdbarch_register_osabi (bfd_arch_m68k, 0, GDB_OSABI_NETBSD, 159 m68kbsd_init_abi); 160 } 161