| 1 | /* Target-dependent code for Motorola 68000 BSD's. |
| 2 | |
| 3 | Copyright 2004 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 2 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, write to the Free Software |
| 19 | Foundation, Inc., 59 Temple Place - Suite 330, |
| 20 | Boston, MA 02111-1307, USA. */ |
| 21 | |
| 22 | #include "defs.h" |
| 23 | #include "arch-utils.h" |
| 24 | #include "osabi.h" |
| 25 | #include "regcache.h" |
| 26 | #include "regset.h" |
| 27 | |
| 28 | #include "gdb_assert.h" |
| 29 | #include "gdb_string.h" |
| 30 | |
| 31 | #include "m68k-tdep.h" |
| 32 | #include "solib-svr4.h" |
| 33 | |
| 34 | /* Core file support. */ |
| 35 | |
| 36 | /* Sizeof `struct reg' in <machine/reg.h>. */ |
| 37 | #define M68KBSD_SIZEOF_GREGS (18 * 4) |
| 38 | |
| 39 | /* Sizeof `struct fpreg' in <machine/reg.h. */ |
| 40 | #define M68KBSD_SIZEOF_FPREGS (((8 * 3) + 3) * 4) |
| 41 | |
| 42 | int |
| 43 | m68kbsd_fpreg_offset (int regnum) |
| 44 | { |
| 45 | if (regnum >= M68K_FPC_REGNUM) |
| 46 | return 8 * 12 + (regnum - M68K_FPC_REGNUM) * 4; |
| 47 | |
| 48 | return (regnum - M68K_FP0_REGNUM) * 12; |
| 49 | } |
| 50 | |
| 51 | /* Supply register REGNUM from the buffer specified by FPREGS and LEN |
| 52 | in the floating-point register set REGSET to register cache |
| 53 | REGCACHE. If REGNUM is -1, do this for all registers in REGSET. */ |
| 54 | |
| 55 | static void |
| 56 | m68kbsd_supply_fpregset (const struct regset *regset, |
| 57 | struct regcache *regcache, |
| 58 | int regnum, const void *fpregs, size_t len) |
| 59 | { |
| 60 | const char *regs = fpregs; |
| 61 | int i; |
| 62 | |
| 63 | gdb_assert (len >= M68KBSD_SIZEOF_FPREGS); |
| 64 | |
| 65 | for (i = M68K_FP0_REGNUM; i <= M68K_PC_REGNUM; i++) |
| 66 | { |
| 67 | if (regnum == i || regnum == -1) |
| 68 | regcache_raw_supply (regcache, i, regs + m68kbsd_fpreg_offset (i)); |
| 69 | } |
| 70 | } |
| 71 | |
| 72 | /* Supply register REGNUM from the buffer specified by GREGS and LEN |
| 73 | in the general-purpose register set REGSET to register cache |
| 74 | REGCACHE. If REGNUM is -1, do this for all registers in REGSET. */ |
| 75 | |
| 76 | static void |
| 77 | m68kbsd_supply_gregset (const struct regset *regset, |
| 78 | struct regcache *regcache, |
| 79 | int regnum, const void *gregs, size_t len) |
| 80 | { |
| 81 | const char *regs = gregs; |
| 82 | int i; |
| 83 | |
| 84 | gdb_assert (len >= M68KBSD_SIZEOF_GREGS); |
| 85 | |
| 86 | for (i = M68K_D0_REGNUM; i <= M68K_PC_REGNUM; i++) |
| 87 | { |
| 88 | if (regnum == i || regnum == -1) |
| 89 | regcache_raw_supply (regcache, i, regs + i * 4); |
| 90 | } |
| 91 | |
| 92 | if (len >= M68KBSD_SIZEOF_GREGS + M68KBSD_SIZEOF_FPREGS) |
| 93 | { |
| 94 | regs += M68KBSD_SIZEOF_GREGS; |
| 95 | len -= M68KBSD_SIZEOF_GREGS; |
| 96 | m68kbsd_supply_fpregset (regset, regcache, regnum, regs, len); |
| 97 | } |
| 98 | } |
| 99 | |
| 100 | /* Motorola 68000 register sets. */ |
| 101 | |
| 102 | static struct regset m68kbsd_gregset = |
| 103 | { |
| 104 | NULL, |
| 105 | m68kbsd_supply_gregset |
| 106 | }; |
| 107 | |
| 108 | static struct regset m68kbsd_fpregset = |
| 109 | { |
| 110 | NULL, |
| 111 | m68kbsd_supply_fpregset |
| 112 | }; |
| 113 | |
| 114 | /* Return the appropriate register set for the core section identified |
| 115 | by SECT_NAME and SECT_SIZE. */ |
| 116 | |
| 117 | static const struct regset * |
| 118 | m68kbsd_regset_from_core_section (struct gdbarch *gdbarch, |
| 119 | const char *sect_name, size_t sect_size) |
| 120 | { |
| 121 | if (strcmp (sect_name, ".reg") == 0 && sect_size >= M68KBSD_SIZEOF_GREGS) |
| 122 | return &m68kbsd_gregset; |
| 123 | |
| 124 | if (strcmp (sect_name, ".reg2") == 0 && sect_size >= M68KBSD_SIZEOF_FPREGS) |
| 125 | return &m68kbsd_fpregset; |
| 126 | |
| 127 | return NULL; |
| 128 | } |
| 129 | |
| 130 | static void |
| 131 | m68kbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) |
| 132 | { |
| 133 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 134 | |
| 135 | tdep->jb_pc = 5; |
| 136 | tdep->jb_elt_size = 4; |
| 137 | |
| 138 | set_gdbarch_regset_from_core_section |
| 139 | (gdbarch, m68kbsd_regset_from_core_section); |
| 140 | } |
| 141 | |
| 142 | /* OpenBSD and NetBSD a.out. */ |
| 143 | |
| 144 | static void |
| 145 | m68kbsd_aout_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) |
| 146 | { |
| 147 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 148 | |
| 149 | m68kbsd_init_abi (info, gdbarch); |
| 150 | |
| 151 | tdep->struct_return = reg_struct_return; |
| 152 | } |
| 153 | |
| 154 | /* NetBSD ELF. */ |
| 155 | |
| 156 | static void |
| 157 | m68kbsd_elf_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) |
| 158 | { |
| 159 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 160 | |
| 161 | m68kbsd_init_abi (info, gdbarch); |
| 162 | |
| 163 | /* NetBSD ELF uses the SVR4 ABI. */ |
| 164 | m68k_svr4_init_abi (info, gdbarch); |
| 165 | tdep->struct_return = pcc_struct_return; |
| 166 | |
| 167 | /* NetBSD ELF uses SVR4-style shared libraries. */ |
| 168 | set_solib_svr4_fetch_link_map_offsets |
| 169 | (gdbarch, svr4_ilp32_fetch_link_map_offsets); |
| 170 | } |
| 171 | \f |
| 172 | |
| 173 | static enum gdb_osabi |
| 174 | m68kbsd_aout_osabi_sniffer (bfd *abfd) |
| 175 | { |
| 176 | if (strcmp (bfd_get_target (abfd), "a.out-m68k-netbsd") == 0 |
| 177 | || strcmp (bfd_get_target (abfd), "a.out-m68k4k-netbsd") == 0) |
| 178 | return GDB_OSABI_NETBSD_AOUT; |
| 179 | |
| 180 | return GDB_OSABI_UNKNOWN; |
| 181 | } |
| 182 | |
| 183 | static enum gdb_osabi |
| 184 | m68kbsd_core_osabi_sniffer (bfd *abfd) |
| 185 | { |
| 186 | if (strcmp (bfd_get_target (abfd), "netbsd-core") == 0) |
| 187 | return GDB_OSABI_NETBSD_AOUT; |
| 188 | |
| 189 | return GDB_OSABI_UNKNOWN; |
| 190 | } |
| 191 | \f |
| 192 | |
| 193 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
| 194 | void _initialize_m68kbsd_tdep (void); |
| 195 | |
| 196 | void |
| 197 | _initialize_m68kbsd_tdep (void) |
| 198 | { |
| 199 | gdbarch_register_osabi_sniffer (bfd_arch_m68k, bfd_target_aout_flavour, |
| 200 | m68kbsd_aout_osabi_sniffer); |
| 201 | |
| 202 | /* BFD doesn't set a flavour for NetBSD style a.out core files. */ |
| 203 | gdbarch_register_osabi_sniffer (bfd_arch_m68k, bfd_target_unknown_flavour, |
| 204 | m68kbsd_core_osabi_sniffer); |
| 205 | |
| 206 | gdbarch_register_osabi (bfd_arch_m68k, 0, GDB_OSABI_NETBSD_AOUT, |
| 207 | m68kbsd_aout_init_abi); |
| 208 | gdbarch_register_osabi (bfd_arch_m68k, 0, GDB_OSABI_NETBSD_ELF, |
| 209 | m68kbsd_elf_init_abi); |
| 210 | } |