1 /* Target-dependent code for NetBSD/sparc. 2 3 Copyright 2002, 2003, 2004 Free Software Foundation, Inc. 4 Contributed by Wasabi Systems, Inc. 5 6 This file is part of GDB. 7 8 This program is free software; you can redistribute it and/or modify 9 it under the terms of the GNU General Public License as published by 10 the Free Software Foundation; either version 2 of the License, or 11 (at your option) any later version. 12 13 This program is distributed in the hope that it will be useful, 14 but WITHOUT ANY WARRANTY; without even the implied warranty of 15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 GNU General Public License for more details. 17 18 You should have received a copy of the GNU General Public License 19 along with this program; if not, write to the Free Software 20 Foundation, Inc., 59 Temple Place - Suite 330, 21 Boston, MA 02111-1307, USA. */ 22 23 #include "defs.h" 24 #include "floatformat.h" 25 #include "frame.h" 26 #include "frame-unwind.h" 27 #include "gdbcore.h" 28 #include "osabi.h" 29 #include "regcache.h" 30 #include "regset.h" 31 #include "solib-svr4.h" 32 #include "symtab.h" 33 #include "trad-frame.h" 34 35 #include "gdb_assert.h" 36 #include "gdb_string.h" 37 38 #include "sparc-tdep.h" 39 #include "nbsd-tdep.h" 40 41 const struct sparc_gregset sparc32nbsd_gregset = 42 { 43 0 * 4, /* %psr */ 44 1 * 4, /* %pc */ 45 2 * 4, /* %npc */ 46 3 * 4, /* %y */ 47 -1, /* %wim */ 48 -1, /* %tbr */ 49 5 * 4, /* %g1 */ 50 -1 /* %l0 */ 51 }; 52 53 static void 54 sparc32nbsd_supply_gregset (const struct regset *regset, 55 struct regcache *regcache, 56 int regnum, const void *gregs, size_t len) 57 { 58 sparc32_supply_gregset (&sparc32nbsd_gregset, regcache, regnum, gregs); 59 60 /* Traditional NetBSD core files don't use multiple register sets. 61 Instead, the general-purpose and floating-point registers are 62 lumped together in a single section. */ 63 if (len >= 212) 64 sparc32_supply_fpregset (regcache, regnum, (const char *) gregs + 80); 65 } 66 67 static void 68 sparc32nbsd_supply_fpregset (const struct regset *regset, 69 struct regcache *regcache, 70 int regnum, const void *fpregs, size_t len) 71 { 72 sparc32_supply_fpregset (regcache, regnum, fpregs); 73 } 74 75 76 /* Signal trampolines. */ 77 78 /* The following variables describe the location of an on-stack signal 79 trampoline. The current values correspond to the memory layout for 80 NetBSD 1.3 and up. These shouldn't be necessary for NetBSD 2.0 and 81 up, since NetBSD uses signal trampolines provided by libc now. */ 82 83 static const CORE_ADDR sparc32nbsd_sigtramp_start = 0xeffffef0; 84 static const CORE_ADDR sparc32nbsd_sigtramp_end = 0xeffffff0; 85 86 static int 87 sparc32nbsd_pc_in_sigtramp (CORE_ADDR pc, char *name) 88 { 89 if (pc >= sparc32nbsd_sigtramp_start && pc < sparc32nbsd_sigtramp_end) 90 return 1; 91 92 return nbsd_pc_in_sigtramp (pc, name); 93 } 94 95 struct trad_frame_saved_reg * 96 sparc32nbsd_sigcontext_saved_regs (struct frame_info *next_frame) 97 { 98 struct trad_frame_saved_reg *saved_regs; 99 CORE_ADDR addr, sigcontext_addr; 100 int regnum, delta; 101 ULONGEST psr; 102 103 saved_regs = trad_frame_alloc_saved_regs (next_frame); 104 105 /* We find the appropriate instance of `struct sigcontext' at a 106 fixed offset in the signal frame. */ 107 addr = frame_unwind_register_unsigned (next_frame, SPARC_FP_REGNUM); 108 sigcontext_addr = addr + 64 + 16; 109 110 /* The registers are saved in bits and pieces scattered all over the 111 place. The code below records their location on the assumption 112 that the part of the signal trampoline that saves the state has 113 been executed. */ 114 115 saved_regs[SPARC_SP_REGNUM].addr = sigcontext_addr + 8; 116 saved_regs[SPARC32_PC_REGNUM].addr = sigcontext_addr + 12; 117 saved_regs[SPARC32_NPC_REGNUM].addr = sigcontext_addr + 16; 118 saved_regs[SPARC32_PSR_REGNUM].addr = sigcontext_addr + 20; 119 saved_regs[SPARC_G1_REGNUM].addr = sigcontext_addr + 24; 120 saved_regs[SPARC_O0_REGNUM].addr = sigcontext_addr + 28; 121 122 /* The remaining `global' registers and %y are saved in the `local' 123 registers. */ 124 delta = SPARC_L0_REGNUM - SPARC_G0_REGNUM; 125 for (regnum = SPARC_G2_REGNUM; regnum <= SPARC_G7_REGNUM; regnum++) 126 saved_regs[regnum].realreg = regnum + delta; 127 saved_regs[SPARC32_Y_REGNUM].realreg = SPARC_L1_REGNUM; 128 129 /* The remaining `out' registers can be found in the current frame's 130 `in' registers. */ 131 delta = SPARC_I0_REGNUM - SPARC_O0_REGNUM; 132 for (regnum = SPARC_O1_REGNUM; regnum <= SPARC_O5_REGNUM; regnum++) 133 saved_regs[regnum].realreg = regnum + delta; 134 saved_regs[SPARC_O7_REGNUM].realreg = SPARC_I7_REGNUM; 135 136 /* The `local' and `in' registers have been saved in the register 137 save area. */ 138 addr = saved_regs[SPARC_SP_REGNUM].addr; 139 addr = get_frame_memory_unsigned (next_frame, addr, 4); 140 for (regnum = SPARC_L0_REGNUM; 141 regnum <= SPARC_I7_REGNUM; regnum++, addr += 4) 142 saved_regs[regnum].addr = addr; 143 144 /* Handle StackGhost. */ 145 { 146 ULONGEST wcookie = sparc_fetch_wcookie (); 147 148 if (wcookie != 0) 149 { 150 ULONGEST i7; 151 152 addr = saved_regs[SPARC_I7_REGNUM].addr; 153 i7 = get_frame_memory_unsigned (next_frame, addr, 4); 154 trad_frame_set_value (saved_regs, SPARC_I7_REGNUM, i7 ^ wcookie); 155 } 156 } 157 158 /* The floating-point registers are only saved if the EF bit in %prs 159 has been set. */ 160 161 #define PSR_EF 0x00001000 162 163 addr = saved_regs[SPARC32_PSR_REGNUM].addr; 164 psr = get_frame_memory_unsigned (next_frame, addr, 4); 165 if (psr & PSR_EF) 166 { 167 CORE_ADDR sp; 168 169 sp = frame_unwind_register_unsigned (next_frame, SPARC_SP_REGNUM); 170 saved_regs[SPARC32_FSR_REGNUM].addr = sp + 96; 171 for (regnum = SPARC_F0_REGNUM, addr = sp + 96 + 8; 172 regnum <= SPARC_F31_REGNUM; regnum++, addr += 4) 173 saved_regs[regnum].addr = addr; 174 } 175 176 return saved_regs; 177 } 178 179 static struct sparc_frame_cache * 180 sparc32nbsd_sigcontext_frame_cache (struct frame_info *next_frame, 181 void **this_cache) 182 { 183 struct sparc_frame_cache *cache; 184 CORE_ADDR addr; 185 186 if (*this_cache) 187 return *this_cache; 188 189 cache = sparc_frame_cache (next_frame, this_cache); 190 gdb_assert (cache == *this_cache); 191 192 /* If we couldn't find the frame's function, we're probably dealing 193 with an on-stack signal trampoline. */ 194 if (cache->pc == 0) 195 { 196 cache->pc = sparc32nbsd_sigtramp_start; 197 198 /* Since we couldn't find the frame's function, the cache was 199 initialized under the assumption that we're frameless. */ 200 cache->frameless_p = 0; 201 addr = frame_unwind_register_unsigned (next_frame, SPARC_FP_REGNUM); 202 cache->base = addr; 203 } 204 205 cache->saved_regs = sparc32nbsd_sigcontext_saved_regs (next_frame); 206 207 return cache; 208 } 209 210 static void 211 sparc32nbsd_sigcontext_frame_this_id (struct frame_info *next_frame, 212 void **this_cache, 213 struct frame_id *this_id) 214 { 215 struct sparc_frame_cache *cache = 216 sparc32nbsd_sigcontext_frame_cache (next_frame, this_cache); 217 218 (*this_id) = frame_id_build (cache->base, cache->pc); 219 } 220 221 static void 222 sparc32nbsd_sigcontext_frame_prev_register (struct frame_info *next_frame, 223 void **this_cache, 224 int regnum, int *optimizedp, 225 enum lval_type *lvalp, 226 CORE_ADDR *addrp, 227 int *realnump, void *valuep) 228 { 229 struct sparc_frame_cache *cache = 230 sparc32nbsd_sigcontext_frame_cache (next_frame, this_cache); 231 232 trad_frame_get_prev_register (next_frame, cache->saved_regs, regnum, 233 optimizedp, lvalp, addrp, realnump, valuep); 234 } 235 236 static const struct frame_unwind sparc32nbsd_sigcontext_frame_unwind = 237 { 238 SIGTRAMP_FRAME, 239 sparc32nbsd_sigcontext_frame_this_id, 240 sparc32nbsd_sigcontext_frame_prev_register 241 }; 242 243 static const struct frame_unwind * 244 sparc32nbsd_sigtramp_frame_sniffer (struct frame_info *next_frame) 245 { 246 CORE_ADDR pc = frame_pc_unwind (next_frame); 247 char *name; 248 249 find_pc_partial_function (pc, &name, NULL, NULL); 250 if (sparc32nbsd_pc_in_sigtramp (pc, name)) 251 { 252 if (name == NULL || strncmp (name, "__sigtramp_sigcontext", 21)) 253 return &sparc32nbsd_sigcontext_frame_unwind; 254 } 255 256 return NULL; 257 } 258 259 260 /* Return non-zero if we are in a shared library trampoline code stub. */ 261 262 static int 263 sparcnbsd_aout_in_solib_call_trampoline (CORE_ADDR pc, char *name) 264 { 265 return (name && !strcmp (name, "_DYNAMIC")); 266 } 267 268 static void 269 sparc32nbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) 270 { 271 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); 272 273 /* NetBSD doesn't support the 128-bit `long double' from the psABI. */ 274 set_gdbarch_long_double_bit (gdbarch, 64); 275 set_gdbarch_long_double_format (gdbarch, &floatformat_ieee_double_big); 276 277 tdep->gregset = regset_alloc (gdbarch, sparc32nbsd_supply_gregset, NULL); 278 tdep->sizeof_gregset = 20 * 4; 279 280 tdep->fpregset = regset_alloc (gdbarch, sparc32nbsd_supply_fpregset, NULL); 281 tdep->sizeof_fpregset = 33 * 4; 282 283 frame_unwind_append_sniffer (gdbarch, sparc32nbsd_sigtramp_frame_sniffer); 284 } 285 286 static void 287 sparc32nbsd_aout_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) 288 { 289 sparc32nbsd_init_abi (info, gdbarch); 290 291 set_gdbarch_in_solib_call_trampoline 292 (gdbarch, sparcnbsd_aout_in_solib_call_trampoline); 293 } 294 295 void 296 sparc32nbsd_elf_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) 297 { 298 sparc32nbsd_init_abi (info, gdbarch); 299 300 set_solib_svr4_fetch_link_map_offsets 301 (gdbarch, svr4_ilp32_fetch_link_map_offsets); 302 } 303 304 static enum gdb_osabi 305 sparcnbsd_aout_osabi_sniffer (bfd *abfd) 306 { 307 if (strcmp (bfd_get_target (abfd), "a.out-sparc-netbsd") == 0) 308 return GDB_OSABI_NETBSD_AOUT; 309 310 return GDB_OSABI_UNKNOWN; 311 } 312 313 /* OpenBSD uses the traditional NetBSD core file format, even for 314 ports that use ELF. Therefore, if the default OS ABI is OpenBSD 315 ELF, we return that instead of NetBSD a.out. This is mainly for 316 the benfit of OpenBSD/sparc64, which inherits the sniffer below 317 since we include this file for an OpenBSD/sparc64 target. For 318 OpenBSD/sparc, the NetBSD a.out OS ABI is probably similar enough 319 to both the OpenBSD a.out and the OpenBSD ELF OS ABI. */ 320 #if defined (GDB_OSABI_DEFAULT) && (GDB_OSABI_DEFAULT == GDB_OSABI_OPENBSD_ELF) 321 #define GDB_OSABI_NETBSD_CORE GDB_OSABI_OPENBSD_ELF 322 #else 323 #define GDB_OSABI_NETBSD_CORE GDB_OSABI_NETBSD_AOUT 324 #endif 325 326 static enum gdb_osabi 327 sparcnbsd_core_osabi_sniffer (bfd *abfd) 328 { 329 if (strcmp (bfd_get_target (abfd), "netbsd-core") == 0) 330 return GDB_OSABI_NETBSD_CORE; 331 332 return GDB_OSABI_UNKNOWN; 333 } 334 335 336 /* Provide a prototype to silence -Wmissing-prototypes. */ 337 void _initialize_sparcnbsd_tdep (void); 338 339 void 340 _initialize_sparnbsd_tdep (void) 341 { 342 gdbarch_register_osabi_sniffer (bfd_arch_sparc, bfd_target_aout_flavour, 343 sparcnbsd_aout_osabi_sniffer); 344 345 /* BFD doesn't set a flavour for NetBSD style a.out core files. */ 346 gdbarch_register_osabi_sniffer (bfd_arch_sparc, bfd_target_unknown_flavour, 347 sparcnbsd_core_osabi_sniffer); 348 349 gdbarch_register_osabi (bfd_arch_sparc, 0, GDB_OSABI_NETBSD_AOUT, 350 sparc32nbsd_aout_init_abi); 351 gdbarch_register_osabi (bfd_arch_sparc, 0, GDB_OSABI_NETBSD_ELF, 352 sparc32nbsd_elf_init_abi); 353 } 354