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 41const 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 53static void 54sparc32nbsd_supply_gregset (const struct regset *regset, 55 struct regcache *regcache, 56 int regnum, const void *gregs, size_t len) 57{ 58 sparc32_supply_gregset (regset->descr, 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 67static void 68sparc32nbsd_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 83static const CORE_ADDR sparc32nbsd_sigtramp_start = 0xeffffef0; 84static const CORE_ADDR sparc32nbsd_sigtramp_end = 0xeffffff0; 85 86static int 87sparc32nbsd_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 95struct trad_frame_saved_reg * 96sparc32nbsd_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 179static struct sparc_frame_cache * 180sparc32nbsd_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 210static void 211sparc32nbsd_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 221static void 222sparc32nbsd_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_prev_register (next_frame, cache->saved_regs, regnum, 233 optimizedp, lvalp, addrp, realnump, valuep); 234} 235 236static 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 243static const struct frame_unwind * 244sparc32nbsd_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 262static int 263sparcnbsd_aout_in_solib_call_trampoline (CORE_ADDR pc, char *name) 264{ 265 return (name && !strcmp (name, "_DYNAMIC")); 266} 267 268static void 269sparc32nbsd_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 = XMALLOC (struct regset); 278 tdep->gregset->descr = &sparc32nbsd_gregset; 279 tdep->gregset->supply_regset = sparc32nbsd_supply_gregset; 280 tdep->sizeof_gregset = 20 * 4; 281 282 tdep->fpregset = XMALLOC (struct regset); 283 tdep->fpregset->supply_regset = sparc32nbsd_supply_fpregset; 284 tdep->sizeof_fpregset = 33 * 4; 285 286 set_gdbarch_pc_in_sigtramp (gdbarch, sparc32nbsd_pc_in_sigtramp); 287 frame_unwind_append_sniffer (gdbarch, sparc32nbsd_sigtramp_frame_sniffer); 288} 289 290static void 291sparc32nbsd_aout_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) 292{ 293 sparc32nbsd_init_abi (info, gdbarch); 294 295 set_gdbarch_in_solib_call_trampoline 296 (gdbarch, sparcnbsd_aout_in_solib_call_trampoline); 297} 298 299static void 300sparc32nbsd_elf_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) 301{ 302 sparc32nbsd_init_abi (info, gdbarch); 303 304 set_solib_svr4_fetch_link_map_offsets 305 (gdbarch, nbsd_ilp32_solib_svr4_fetch_link_map_offsets); 306} 307 308static enum gdb_osabi 309sparcnbsd_aout_osabi_sniffer (bfd *abfd) 310{ 311 if (strcmp (bfd_get_target (abfd), "a.out-sparc-netbsd") == 0) 312 return GDB_OSABI_NETBSD_AOUT; 313 314 return GDB_OSABI_UNKNOWN; 315} 316 317/* OpenBSD uses the traditional NetBSD core file format, even for 318 ports that use ELF. Therefore, if the default OS ABI is OpenBSD 319 ELF, we return that instead of NetBSD a.out. This is mainly for 320 the benfit of OpenBSD/sparc64, which inherits the sniffer below 321 since we include this file for an OpenBSD/sparc64 target. For 322 OpenBSD/sparc, the NetBSD a.out OS ABI is probably similar enough 323 to both the OpenBSD a.out and the OpenBSD ELF OS ABI. */ 324#if defined (GDB_OSABI_DEFAULT) && (GDB_OSABI_DEFAULT == GDB_OSABI_OPENBSD_ELF) 325#define GDB_OSABI_NETBSD_CORE GDB_OSABI_OPENBSD_ELF 326#else 327#define GDB_OSABI_NETBSD_CORE GDB_OSABI_NETBSD_AOUT 328#endif 329 330static enum gdb_osabi 331sparcnbsd_core_osabi_sniffer (bfd *abfd) 332{ 333 if (strcmp (bfd_get_target (abfd), "netbsd-core") == 0) 334 return GDB_OSABI_NETBSD_CORE; 335 336 return GDB_OSABI_UNKNOWN; 337} 338 339 340/* Provide a prototype to silence -Wmissing-prototypes. */ 341void _initialize_sparcnbsd_tdep (void); 342 343void 344_initialize_sparnbsd_tdep (void) 345{ 346 gdbarch_register_osabi_sniffer (bfd_arch_sparc, bfd_target_aout_flavour, 347 sparcnbsd_aout_osabi_sniffer); 348 349 /* BFD doesn't set the architecture for NetBSD style a.out core 350 files. */ 351 gdbarch_register_osabi_sniffer (bfd_arch_unknown, bfd_target_unknown_flavour, 352 sparcnbsd_core_osabi_sniffer); 353 354 gdbarch_register_osabi (bfd_arch_sparc, 0, GDB_OSABI_NETBSD_AOUT, 355 sparc32nbsd_aout_init_abi); 356 gdbarch_register_osabi (bfd_arch_sparc, 0, GDB_OSABI_NETBSD_ELF, 357 sparc32nbsd_elf_init_abi); 358} 359