| 1 | /* Target-dependent code for PowerPC systems running NetBSD. |
| 2 | Copyright 2002, 2003 Free Software Foundation, Inc. |
| 3 | Contributed by Wasabi Systems, 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 "gdbcore.h" |
| 24 | #include "regcache.h" |
| 25 | #include "target.h" |
| 26 | #include "breakpoint.h" |
| 27 | #include "value.h" |
| 28 | #include "osabi.h" |
| 29 | |
| 30 | #include "ppc-tdep.h" |
| 31 | #include "ppcnbsd-tdep.h" |
| 32 | #include "nbsd-tdep.h" |
| 33 | |
| 34 | #include "solib-svr4.h" |
| 35 | |
| 36 | #define REG_FIXREG_OFFSET(x) ((x) * 4) |
| 37 | #define REG_LR_OFFSET (32 * 4) |
| 38 | #define REG_CR_OFFSET (33 * 4) |
| 39 | #define REG_XER_OFFSET (34 * 4) |
| 40 | #define REG_CTR_OFFSET (35 * 4) |
| 41 | #define REG_PC_OFFSET (36 * 4) |
| 42 | #define SIZEOF_STRUCT_REG (37 * 4) |
| 43 | |
| 44 | #define FPREG_FPR_OFFSET(x) ((x) * 8) |
| 45 | #define FPREG_FPSCR_OFFSET (32 * 8) |
| 46 | #define SIZEOF_STRUCT_FPREG (33 * 8) |
| 47 | |
| 48 | void |
| 49 | ppcnbsd_supply_reg (char *regs, int regno) |
| 50 | { |
| 51 | struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); |
| 52 | int i; |
| 53 | |
| 54 | for (i = 0; i <= 31; i++) |
| 55 | { |
| 56 | if (regno == i || regno == -1) |
| 57 | supply_register (i, regs + REG_FIXREG_OFFSET (i)); |
| 58 | } |
| 59 | |
| 60 | if (regno == tdep->ppc_lr_regnum || regno == -1) |
| 61 | supply_register (tdep->ppc_lr_regnum, regs + REG_LR_OFFSET); |
| 62 | |
| 63 | if (regno == tdep->ppc_cr_regnum || regno == -1) |
| 64 | supply_register (tdep->ppc_cr_regnum, regs + REG_CR_OFFSET); |
| 65 | |
| 66 | if (regno == tdep->ppc_xer_regnum || regno == -1) |
| 67 | supply_register (tdep->ppc_xer_regnum, regs + REG_XER_OFFSET); |
| 68 | |
| 69 | if (regno == tdep->ppc_ctr_regnum || regno == -1) |
| 70 | supply_register (tdep->ppc_ctr_regnum, regs + REG_CTR_OFFSET); |
| 71 | |
| 72 | if (regno == PC_REGNUM || regno == -1) |
| 73 | supply_register (PC_REGNUM, regs + REG_PC_OFFSET); |
| 74 | } |
| 75 | |
| 76 | void |
| 77 | ppcnbsd_fill_reg (char *regs, int regno) |
| 78 | { |
| 79 | struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); |
| 80 | int i; |
| 81 | |
| 82 | for (i = 0; i <= 31; i++) |
| 83 | { |
| 84 | if (regno == i || regno == -1) |
| 85 | regcache_collect (i, regs + REG_FIXREG_OFFSET (i)); |
| 86 | } |
| 87 | |
| 88 | if (regno == tdep->ppc_lr_regnum || regno == -1) |
| 89 | regcache_collect (tdep->ppc_lr_regnum, regs + REG_LR_OFFSET); |
| 90 | |
| 91 | if (regno == tdep->ppc_cr_regnum || regno == -1) |
| 92 | regcache_collect (tdep->ppc_cr_regnum, regs + REG_CR_OFFSET); |
| 93 | |
| 94 | if (regno == tdep->ppc_xer_regnum || regno == -1) |
| 95 | regcache_collect (tdep->ppc_xer_regnum, regs + REG_XER_OFFSET); |
| 96 | |
| 97 | if (regno == tdep->ppc_ctr_regnum || regno == -1) |
| 98 | regcache_collect (tdep->ppc_ctr_regnum, regs + REG_CTR_OFFSET); |
| 99 | |
| 100 | if (regno == PC_REGNUM || regno == -1) |
| 101 | regcache_collect (PC_REGNUM, regs + REG_PC_OFFSET); |
| 102 | } |
| 103 | |
| 104 | void |
| 105 | ppcnbsd_supply_fpreg (char *fpregs, int regno) |
| 106 | { |
| 107 | struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); |
| 108 | int i; |
| 109 | |
| 110 | for (i = FP0_REGNUM; i <= FP0_REGNUM + 31; i++) |
| 111 | { |
| 112 | if (regno == i || regno == -1) |
| 113 | supply_register (i, fpregs + FPREG_FPR_OFFSET (i - FP0_REGNUM)); |
| 114 | } |
| 115 | |
| 116 | if (regno == tdep->ppc_fpscr_regnum || regno == -1) |
| 117 | supply_register (tdep->ppc_fpscr_regnum, fpregs + FPREG_FPSCR_OFFSET); |
| 118 | } |
| 119 | |
| 120 | void |
| 121 | ppcnbsd_fill_fpreg (char *fpregs, int regno) |
| 122 | { |
| 123 | struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); |
| 124 | int i; |
| 125 | |
| 126 | for (i = FP0_REGNUM; i <= FP0_REGNUM + 31; i++) |
| 127 | { |
| 128 | if (regno == i || regno == -1) |
| 129 | regcache_collect (i, fpregs + FPREG_FPR_OFFSET (i - FP0_REGNUM)); |
| 130 | } |
| 131 | |
| 132 | if (regno == tdep->ppc_fpscr_regnum || regno == -1) |
| 133 | regcache_collect (tdep->ppc_fpscr_regnum, fpregs + FPREG_FPSCR_OFFSET); |
| 134 | } |
| 135 | |
| 136 | static void |
| 137 | fetch_core_registers (char *core_reg_sect, unsigned core_reg_size, int which, |
| 138 | CORE_ADDR ignore) |
| 139 | { |
| 140 | char *regs, *fpregs; |
| 141 | |
| 142 | /* We get everything from one section. */ |
| 143 | if (which != 0) |
| 144 | return; |
| 145 | |
| 146 | regs = core_reg_sect; |
| 147 | fpregs = core_reg_sect + SIZEOF_STRUCT_REG; |
| 148 | |
| 149 | /* Integer registers. */ |
| 150 | ppcnbsd_supply_reg (regs, -1); |
| 151 | |
| 152 | /* Floating point registers. */ |
| 153 | ppcnbsd_supply_fpreg (fpregs, -1); |
| 154 | } |
| 155 | |
| 156 | static void |
| 157 | fetch_elfcore_registers (char *core_reg_sect, unsigned core_reg_size, int which, |
| 158 | CORE_ADDR ignore) |
| 159 | { |
| 160 | switch (which) |
| 161 | { |
| 162 | case 0: /* Integer registers. */ |
| 163 | if (core_reg_size != SIZEOF_STRUCT_REG) |
| 164 | warning ("Wrong size register set in core file."); |
| 165 | else |
| 166 | ppcnbsd_supply_reg (core_reg_sect, -1); |
| 167 | break; |
| 168 | |
| 169 | case 2: /* Floating point registers. */ |
| 170 | if (core_reg_size != SIZEOF_STRUCT_FPREG) |
| 171 | warning ("Wrong size FP register set in core file."); |
| 172 | else |
| 173 | ppcnbsd_supply_fpreg (core_reg_sect, -1); |
| 174 | break; |
| 175 | |
| 176 | default: |
| 177 | /* Don't know what kind of register request this is; just ignore it. */ |
| 178 | break; |
| 179 | } |
| 180 | } |
| 181 | |
| 182 | static struct core_fns ppcnbsd_core_fns = |
| 183 | { |
| 184 | bfd_target_unknown_flavour, /* core_flavour */ |
| 185 | default_check_format, /* check_format */ |
| 186 | default_core_sniffer, /* core_sniffer */ |
| 187 | fetch_core_registers, /* core_read_registers */ |
| 188 | NULL /* next */ |
| 189 | }; |
| 190 | |
| 191 | static struct core_fns ppcnbsd_elfcore_fns = |
| 192 | { |
| 193 | bfd_target_elf_flavour, /* core_flavour */ |
| 194 | default_check_format, /* check_format */ |
| 195 | default_core_sniffer, /* core_sniffer */ |
| 196 | fetch_elfcore_registers, /* core_read_registers */ |
| 197 | NULL /* next */ |
| 198 | }; |
| 199 | |
| 200 | static int |
| 201 | ppcnbsd_pc_in_sigtramp (CORE_ADDR pc, char *func_name) |
| 202 | { |
| 203 | /* FIXME: Need to add support for kernel-provided signal trampolines. */ |
| 204 | return (nbsd_pc_in_sigtramp (pc, func_name)); |
| 205 | } |
| 206 | |
| 207 | /* NetBSD is confused. It appears that 1.5 was using the correct SVr4 |
| 208 | convention but, 1.6 switched to the below broken convention. For |
| 209 | the moment use the broken convention. Ulgh!. */ |
| 210 | |
| 211 | static enum return_value_convention |
| 212 | ppcnbsd_return_value (struct gdbarch *gdbarch, struct type *valtype, |
| 213 | struct regcache *regcache, void *readbuf, |
| 214 | const void *writebuf) |
| 215 | { |
| 216 | if ((TYPE_CODE (valtype) == TYPE_CODE_STRUCT |
| 217 | || TYPE_CODE (valtype) == TYPE_CODE_UNION) |
| 218 | && !((TYPE_LENGTH (valtype) == 16 || TYPE_LENGTH (valtype) == 8) |
| 219 | && TYPE_VECTOR (valtype)) |
| 220 | && !(TYPE_LENGTH (valtype) == 1 |
| 221 | || TYPE_LENGTH (valtype) == 2 |
| 222 | || TYPE_LENGTH (valtype) == 4 |
| 223 | || TYPE_LENGTH (valtype) == 8)) |
| 224 | return RETURN_VALUE_STRUCT_CONVENTION; |
| 225 | else |
| 226 | return ppc_sysv_abi_broken_return_value (gdbarch, valtype, regcache, |
| 227 | readbuf, writebuf); |
| 228 | } |
| 229 | |
| 230 | static void |
| 231 | ppcnbsd_init_abi (struct gdbarch_info info, |
| 232 | struct gdbarch *gdbarch) |
| 233 | { |
| 234 | set_gdbarch_pc_in_sigtramp (gdbarch, ppcnbsd_pc_in_sigtramp); |
| 235 | /* For NetBSD, this is an on again, off again thing. Some systems |
| 236 | do use the broken struct convention, and some don't. */ |
| 237 | set_gdbarch_return_value (gdbarch, ppcnbsd_return_value); |
| 238 | set_solib_svr4_fetch_link_map_offsets (gdbarch, |
| 239 | nbsd_ilp32_solib_svr4_fetch_link_map_offsets); |
| 240 | } |
| 241 | |
| 242 | void |
| 243 | _initialize_ppcnbsd_tdep (void) |
| 244 | { |
| 245 | gdbarch_register_osabi (bfd_arch_powerpc, 0, GDB_OSABI_NETBSD_ELF, |
| 246 | ppcnbsd_init_abi); |
| 247 | |
| 248 | add_core_fns (&ppcnbsd_core_fns); |
| 249 | add_core_fns (&ppcnbsd_elfcore_fns); |
| 250 | } |