| 1 | /* Target-dependent code for PowerPC systems running NetBSD. |
| 2 | |
| 3 | Copyright 2002, 2003, 2004 Free Software Foundation, Inc. |
| 4 | |
| 5 | Contributed by Wasabi Systems, Inc. |
| 6 | |
| 7 | This file is part of GDB. |
| 8 | |
| 9 | This program is free software; you can redistribute it and/or modify |
| 10 | it under the terms of the GNU General Public License as published by |
| 11 | the Free Software Foundation; either version 2 of the License, or |
| 12 | (at your option) any later version. |
| 13 | |
| 14 | This program is distributed in the hope that it will be useful, |
| 15 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 | GNU General Public License for more details. |
| 18 | |
| 19 | You should have received a copy of the GNU General Public License |
| 20 | along with this program; if not, write to the Free Software |
| 21 | Foundation, Inc., 59 Temple Place - Suite 330, |
| 22 | Boston, MA 02111-1307, USA. */ |
| 23 | |
| 24 | #include "defs.h" |
| 25 | #include "gdbcore.h" |
| 26 | #include "regcache.h" |
| 27 | #include "target.h" |
| 28 | #include "breakpoint.h" |
| 29 | #include "value.h" |
| 30 | #include "osabi.h" |
| 31 | |
| 32 | #include "ppc-tdep.h" |
| 33 | #include "ppcnbsd-tdep.h" |
| 34 | #include "nbsd-tdep.h" |
| 35 | #include "tramp-frame.h" |
| 36 | #include "trad-frame.h" |
| 37 | #include "gdb_assert.h" |
| 38 | #include "solib-svr4.h" |
| 39 | |
| 40 | #define REG_FIXREG_OFFSET(x) ((x) * 4) |
| 41 | #define REG_LR_OFFSET (32 * 4) |
| 42 | #define REG_CR_OFFSET (33 * 4) |
| 43 | #define REG_XER_OFFSET (34 * 4) |
| 44 | #define REG_CTR_OFFSET (35 * 4) |
| 45 | #define REG_PC_OFFSET (36 * 4) |
| 46 | #define SIZEOF_STRUCT_REG (37 * 4) |
| 47 | |
| 48 | #define FPREG_FPR_OFFSET(x) ((x) * 8) |
| 49 | #define FPREG_FPSCR_OFFSET (32 * 8) |
| 50 | #define SIZEOF_STRUCT_FPREG (33 * 8) |
| 51 | |
| 52 | void |
| 53 | ppcnbsd_supply_reg (char *regs, int regno) |
| 54 | { |
| 55 | struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); |
| 56 | int i; |
| 57 | |
| 58 | for (i = 0; i < ppc_num_gprs; i++) |
| 59 | { |
| 60 | if (regno == tdep->ppc_gp0_regnum + i || regno == -1) |
| 61 | supply_register (tdep->ppc_gp0_regnum + i, |
| 62 | regs + REG_FIXREG_OFFSET (i)); |
| 63 | } |
| 64 | |
| 65 | if (regno == tdep->ppc_lr_regnum || regno == -1) |
| 66 | supply_register (tdep->ppc_lr_regnum, regs + REG_LR_OFFSET); |
| 67 | |
| 68 | if (regno == tdep->ppc_cr_regnum || regno == -1) |
| 69 | supply_register (tdep->ppc_cr_regnum, regs + REG_CR_OFFSET); |
| 70 | |
| 71 | if (regno == tdep->ppc_xer_regnum || regno == -1) |
| 72 | supply_register (tdep->ppc_xer_regnum, regs + REG_XER_OFFSET); |
| 73 | |
| 74 | if (regno == tdep->ppc_ctr_regnum || regno == -1) |
| 75 | supply_register (tdep->ppc_ctr_regnum, regs + REG_CTR_OFFSET); |
| 76 | |
| 77 | if (regno == PC_REGNUM || regno == -1) |
| 78 | supply_register (PC_REGNUM, regs + REG_PC_OFFSET); |
| 79 | } |
| 80 | |
| 81 | void |
| 82 | ppcnbsd_fill_reg (char *regs, int regno) |
| 83 | { |
| 84 | struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); |
| 85 | int i; |
| 86 | |
| 87 | for (i = 0; i < ppc_num_gprs; i++) |
| 88 | { |
| 89 | if (regno == tdep->ppc_gp0_regnum + i || regno == -1) |
| 90 | regcache_collect (tdep->ppc_gp0_regnum + i, |
| 91 | regs + REG_FIXREG_OFFSET (i)); |
| 92 | } |
| 93 | |
| 94 | if (regno == tdep->ppc_lr_regnum || regno == -1) |
| 95 | regcache_collect (tdep->ppc_lr_regnum, regs + REG_LR_OFFSET); |
| 96 | |
| 97 | if (regno == tdep->ppc_cr_regnum || regno == -1) |
| 98 | regcache_collect (tdep->ppc_cr_regnum, regs + REG_CR_OFFSET); |
| 99 | |
| 100 | if (regno == tdep->ppc_xer_regnum || regno == -1) |
| 101 | regcache_collect (tdep->ppc_xer_regnum, regs + REG_XER_OFFSET); |
| 102 | |
| 103 | if (regno == tdep->ppc_ctr_regnum || regno == -1) |
| 104 | regcache_collect (tdep->ppc_ctr_regnum, regs + REG_CTR_OFFSET); |
| 105 | |
| 106 | if (regno == PC_REGNUM || regno == -1) |
| 107 | regcache_collect (PC_REGNUM, regs + REG_PC_OFFSET); |
| 108 | } |
| 109 | |
| 110 | void |
| 111 | ppcnbsd_supply_fpreg (char *fpregs, int regno) |
| 112 | { |
| 113 | struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); |
| 114 | int i; |
| 115 | |
| 116 | /* FIXME: jimb/2004-05-05: Some PPC variants don't have floating |
| 117 | point registers. Traditionally, GDB's register set has still |
| 118 | listed the floating point registers for such machines, so this |
| 119 | code is harmless. However, the new E500 port actually omits the |
| 120 | floating point registers entirely from the register set --- they |
| 121 | don't even have register numbers assigned to them. |
| 122 | |
| 123 | It's not clear to me how best to update this code, so this assert |
| 124 | will alert the first person to encounter the NetBSD/E500 |
| 125 | combination to the problem. */ |
| 126 | gdb_assert (ppc_floating_point_unit_p (current_gdbarch)); |
| 127 | |
| 128 | for (i = 0; i < ppc_num_fprs; i++) |
| 129 | { |
| 130 | if (regno == tdep->ppc_fp0_regnum + i || regno == -1) |
| 131 | supply_register (tdep->ppc_fp0_regnum + i, |
| 132 | fpregs + FPREG_FPR_OFFSET (i)); |
| 133 | } |
| 134 | |
| 135 | if (regno == tdep->ppc_fpscr_regnum || regno == -1) |
| 136 | supply_register (tdep->ppc_fpscr_regnum, fpregs + FPREG_FPSCR_OFFSET); |
| 137 | } |
| 138 | |
| 139 | void |
| 140 | ppcnbsd_fill_fpreg (char *fpregs, int regno) |
| 141 | { |
| 142 | struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); |
| 143 | int i; |
| 144 | |
| 145 | /* FIXME: jimb/2004-05-05: Some PPC variants don't have floating |
| 146 | point registers. Traditionally, GDB's register set has still |
| 147 | listed the floating point registers for such machines, so this |
| 148 | code is harmless. However, the new E500 port actually omits the |
| 149 | floating point registers entirely from the register set --- they |
| 150 | don't even have register numbers assigned to them. |
| 151 | |
| 152 | It's not clear to me how best to update this code, so this assert |
| 153 | will alert the first person to encounter the NetBSD/E500 |
| 154 | combination to the problem. */ |
| 155 | gdb_assert (ppc_floating_point_unit_p (current_gdbarch)); |
| 156 | |
| 157 | for (i = 0; i < ppc_num_fprs; i++) |
| 158 | { |
| 159 | if (regno == tdep->ppc_fp0_regnum + i || regno == -1) |
| 160 | regcache_collect (tdep->ppc_fp0_regnum + i, |
| 161 | fpregs + FPREG_FPR_OFFSET (i)); |
| 162 | } |
| 163 | |
| 164 | if (regno == tdep->ppc_fpscr_regnum || regno == -1) |
| 165 | regcache_collect (tdep->ppc_fpscr_regnum, fpregs + FPREG_FPSCR_OFFSET); |
| 166 | } |
| 167 | |
| 168 | static void |
| 169 | fetch_core_registers (char *core_reg_sect, unsigned core_reg_size, int which, |
| 170 | CORE_ADDR ignore) |
| 171 | { |
| 172 | char *regs, *fpregs; |
| 173 | |
| 174 | /* We get everything from one section. */ |
| 175 | if (which != 0) |
| 176 | return; |
| 177 | |
| 178 | regs = core_reg_sect; |
| 179 | fpregs = core_reg_sect + SIZEOF_STRUCT_REG; |
| 180 | |
| 181 | /* Integer registers. */ |
| 182 | ppcnbsd_supply_reg (regs, -1); |
| 183 | |
| 184 | /* Floating point registers. */ |
| 185 | ppcnbsd_supply_fpreg (fpregs, -1); |
| 186 | } |
| 187 | |
| 188 | static void |
| 189 | fetch_elfcore_registers (char *core_reg_sect, unsigned core_reg_size, int which, |
| 190 | CORE_ADDR ignore) |
| 191 | { |
| 192 | switch (which) |
| 193 | { |
| 194 | case 0: /* Integer registers. */ |
| 195 | if (core_reg_size != SIZEOF_STRUCT_REG) |
| 196 | warning ("Wrong size register set in core file."); |
| 197 | else |
| 198 | ppcnbsd_supply_reg (core_reg_sect, -1); |
| 199 | break; |
| 200 | |
| 201 | case 2: /* Floating point registers. */ |
| 202 | if (core_reg_size != SIZEOF_STRUCT_FPREG) |
| 203 | warning ("Wrong size FP register set in core file."); |
| 204 | else |
| 205 | ppcnbsd_supply_fpreg (core_reg_sect, -1); |
| 206 | break; |
| 207 | |
| 208 | default: |
| 209 | /* Don't know what kind of register request this is; just ignore it. */ |
| 210 | break; |
| 211 | } |
| 212 | } |
| 213 | |
| 214 | static struct core_fns ppcnbsd_core_fns = |
| 215 | { |
| 216 | bfd_target_unknown_flavour, /* core_flavour */ |
| 217 | default_check_format, /* check_format */ |
| 218 | default_core_sniffer, /* core_sniffer */ |
| 219 | fetch_core_registers, /* core_read_registers */ |
| 220 | NULL /* next */ |
| 221 | }; |
| 222 | |
| 223 | static struct core_fns ppcnbsd_elfcore_fns = |
| 224 | { |
| 225 | bfd_target_elf_flavour, /* core_flavour */ |
| 226 | default_check_format, /* check_format */ |
| 227 | default_core_sniffer, /* core_sniffer */ |
| 228 | fetch_elfcore_registers, /* core_read_registers */ |
| 229 | NULL /* next */ |
| 230 | }; |
| 231 | |
| 232 | /* NetBSD is confused. It appears that 1.5 was using the correct SVr4 |
| 233 | convention but, 1.6 switched to the below broken convention. For |
| 234 | the moment use the broken convention. Ulgh!. */ |
| 235 | |
| 236 | static enum return_value_convention |
| 237 | ppcnbsd_return_value (struct gdbarch *gdbarch, struct type *valtype, |
| 238 | struct regcache *regcache, void *readbuf, |
| 239 | const void *writebuf) |
| 240 | { |
| 241 | if ((TYPE_CODE (valtype) == TYPE_CODE_STRUCT |
| 242 | || TYPE_CODE (valtype) == TYPE_CODE_UNION) |
| 243 | && !((TYPE_LENGTH (valtype) == 16 || TYPE_LENGTH (valtype) == 8) |
| 244 | && TYPE_VECTOR (valtype)) |
| 245 | && !(TYPE_LENGTH (valtype) == 1 |
| 246 | || TYPE_LENGTH (valtype) == 2 |
| 247 | || TYPE_LENGTH (valtype) == 4 |
| 248 | || TYPE_LENGTH (valtype) == 8)) |
| 249 | return RETURN_VALUE_STRUCT_CONVENTION; |
| 250 | else |
| 251 | return ppc_sysv_abi_broken_return_value (gdbarch, valtype, regcache, |
| 252 | readbuf, writebuf); |
| 253 | } |
| 254 | |
| 255 | static void |
| 256 | ppcnbsd_sigtramp_cache_init (const struct tramp_frame *self, |
| 257 | struct frame_info *next_frame, |
| 258 | struct trad_frame_cache *this_cache, |
| 259 | CORE_ADDR func) |
| 260 | { |
| 261 | CORE_ADDR base; |
| 262 | CORE_ADDR offset; |
| 263 | int i; |
| 264 | struct gdbarch *gdbarch = get_frame_arch (next_frame); |
| 265 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 266 | |
| 267 | base = frame_unwind_register_unsigned (next_frame, SP_REGNUM); |
| 268 | offset = base + 0x18 + 2 * tdep->wordsize; |
| 269 | for (i = 0; i < ppc_num_gprs; i++) |
| 270 | { |
| 271 | int regnum = i + tdep->ppc_gp0_regnum; |
| 272 | trad_frame_set_reg_addr (this_cache, regnum, offset); |
| 273 | offset += tdep->wordsize; |
| 274 | } |
| 275 | trad_frame_set_reg_addr (this_cache, tdep->ppc_lr_regnum, offset); |
| 276 | offset += tdep->wordsize; |
| 277 | trad_frame_set_reg_addr (this_cache, tdep->ppc_cr_regnum, offset); |
| 278 | offset += tdep->wordsize; |
| 279 | trad_frame_set_reg_addr (this_cache, tdep->ppc_xer_regnum, offset); |
| 280 | offset += tdep->wordsize; |
| 281 | trad_frame_set_reg_addr (this_cache, tdep->ppc_ctr_regnum, offset); |
| 282 | offset += tdep->wordsize; |
| 283 | trad_frame_set_reg_addr (this_cache, PC_REGNUM, offset); /* SRR0? */ |
| 284 | offset += tdep->wordsize; |
| 285 | |
| 286 | /* Construct the frame ID using the function start. */ |
| 287 | trad_frame_set_id (this_cache, frame_id_build (base, func)); |
| 288 | } |
| 289 | |
| 290 | /* Given the NEXT frame, examine the instructions at and around this |
| 291 | frame's resume address (aka PC) to see of they look like a signal |
| 292 | trampoline. Return the address of the trampolines first |
| 293 | instruction, or zero if it isn't a signal trampoline. */ |
| 294 | |
| 295 | static const struct tramp_frame ppcnbsd_sigtramp = { |
| 296 | 4, /* insn size */ |
| 297 | { /* insn */ |
| 298 | 0x38610018, /* addi r3,r1,24 */ |
| 299 | 0x38000127, /* li r0,295 */ |
| 300 | 0x44000002, /* sc */ |
| 301 | 0x38000001, /* li r0,1 */ |
| 302 | 0x44000002, /* sc */ |
| 303 | TRAMP_SENTINEL_INSN |
| 304 | }, |
| 305 | ppcnbsd_sigtramp_cache_init |
| 306 | }; |
| 307 | |
| 308 | static void |
| 309 | ppcnbsd_init_abi (struct gdbarch_info info, |
| 310 | struct gdbarch *gdbarch) |
| 311 | { |
| 312 | /* For NetBSD, this is an on again, off again thing. Some systems |
| 313 | do use the broken struct convention, and some don't. */ |
| 314 | set_gdbarch_return_value (gdbarch, ppcnbsd_return_value); |
| 315 | set_solib_svr4_fetch_link_map_offsets (gdbarch, |
| 316 | nbsd_ilp32_solib_svr4_fetch_link_map_offsets); |
| 317 | tramp_frame_prepend_unwinder (gdbarch, &ppcnbsd_sigtramp); |
| 318 | } |
| 319 | |
| 320 | void |
| 321 | _initialize_ppcnbsd_tdep (void) |
| 322 | { |
| 323 | gdbarch_register_osabi (bfd_arch_powerpc, 0, GDB_OSABI_NETBSD_ELF, |
| 324 | ppcnbsd_init_abi); |
| 325 | |
| 326 | deprecated_add_core_fns (&ppcnbsd_core_fns); |
| 327 | deprecated_add_core_fns (&ppcnbsd_elfcore_fns); |
| 328 | } |