| 1 | /* Target-dependent code for NetBSD/sparc64. |
| 2 | |
| 3 | Copyright (C) 2002-2016 Free Software Foundation, Inc. |
| 4 | Based on code 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 3 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, see <http://www.gnu.org/licenses/>. */ |
| 20 | |
| 21 | #include "defs.h" |
| 22 | #include "frame.h" |
| 23 | #include "frame-unwind.h" |
| 24 | #include "gdbcore.h" |
| 25 | #include "osabi.h" |
| 26 | #include "regcache.h" |
| 27 | #include "regset.h" |
| 28 | #include "symtab.h" |
| 29 | #include "objfiles.h" |
| 30 | #include "solib-svr4.h" |
| 31 | #include "trad-frame.h" |
| 32 | |
| 33 | #include "sparc64-tdep.h" |
| 34 | #include "nbsd-tdep.h" |
| 35 | |
| 36 | /* From <machine/reg.h>. */ |
| 37 | const struct sparc_gregmap sparc64nbsd_gregmap = |
| 38 | { |
| 39 | 0 * 8, /* "tstate" */ |
| 40 | 1 * 8, /* %pc */ |
| 41 | 2 * 8, /* %npc */ |
| 42 | 3 * 8, /* %y */ |
| 43 | -1, /* %fprs */ |
| 44 | -1, |
| 45 | 5 * 8, /* %g1 */ |
| 46 | -1, /* %l0 */ |
| 47 | 4 /* sizeof (%y) */ |
| 48 | }; |
| 49 | \f |
| 50 | |
| 51 | static void |
| 52 | sparc64nbsd_supply_gregset (const struct regset *regset, |
| 53 | struct regcache *regcache, |
| 54 | int regnum, const void *gregs, size_t len) |
| 55 | { |
| 56 | sparc64_supply_gregset (&sparc64nbsd_gregmap, regcache, regnum, gregs); |
| 57 | } |
| 58 | |
| 59 | static void |
| 60 | sparc64nbsd_supply_fpregset (const struct regset *regset, |
| 61 | struct regcache *regcache, |
| 62 | int regnum, const void *fpregs, size_t len) |
| 63 | { |
| 64 | sparc64_supply_fpregset (&sparc64_bsd_fpregmap, regcache, regnum, fpregs); |
| 65 | } |
| 66 | \f |
| 67 | |
| 68 | /* Signal trampolines. */ |
| 69 | |
| 70 | /* The following variables describe the location of an on-stack signal |
| 71 | trampoline. The current values correspond to the memory layout for |
| 72 | NetBSD 1.3 and up. These shouldn't be necessary for NetBSD 2.0 and |
| 73 | up, since NetBSD uses signal trampolines provided by libc now. */ |
| 74 | |
| 75 | static const CORE_ADDR sparc64nbsd_sigtramp_start = 0xffffffffffffdee4ULL; |
| 76 | static const CORE_ADDR sparc64nbsd_sigtramp_end = 0xffffffffffffe000ULL; |
| 77 | |
| 78 | static int |
| 79 | sparc64nbsd_pc_in_sigtramp (CORE_ADDR pc, const char *name) |
| 80 | { |
| 81 | if (pc >= sparc64nbsd_sigtramp_start && pc < sparc64nbsd_sigtramp_end) |
| 82 | return 1; |
| 83 | |
| 84 | return nbsd_pc_in_sigtramp (pc, name); |
| 85 | } |
| 86 | |
| 87 | struct trad_frame_saved_reg * |
| 88 | sparc64nbsd_sigcontext_saved_regs (CORE_ADDR sigcontext_addr, |
| 89 | struct frame_info *this_frame) |
| 90 | { |
| 91 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
| 92 | struct trad_frame_saved_reg *saved_regs; |
| 93 | CORE_ADDR addr, sp; |
| 94 | int regnum, delta; |
| 95 | |
| 96 | saved_regs = trad_frame_alloc_saved_regs (this_frame); |
| 97 | |
| 98 | /* The registers are saved in bits and pieces scattered all over the |
| 99 | place. The code below records their location on the assumption |
| 100 | that the part of the signal trampoline that saves the state has |
| 101 | been executed. */ |
| 102 | |
| 103 | saved_regs[SPARC_SP_REGNUM].addr = sigcontext_addr + 8; |
| 104 | saved_regs[SPARC64_PC_REGNUM].addr = sigcontext_addr + 16; |
| 105 | saved_regs[SPARC64_NPC_REGNUM].addr = sigcontext_addr + 24; |
| 106 | saved_regs[SPARC64_STATE_REGNUM].addr = sigcontext_addr + 32; |
| 107 | saved_regs[SPARC_G1_REGNUM].addr = sigcontext_addr + 40; |
| 108 | saved_regs[SPARC_O0_REGNUM].addr = sigcontext_addr + 48; |
| 109 | |
| 110 | /* The remaining `global' registers and %y are saved in the `local' |
| 111 | registers. */ |
| 112 | delta = SPARC_L0_REGNUM - SPARC_G0_REGNUM; |
| 113 | for (regnum = SPARC_G2_REGNUM; regnum <= SPARC_G7_REGNUM; regnum++) |
| 114 | saved_regs[regnum].realreg = regnum + delta; |
| 115 | saved_regs[SPARC64_Y_REGNUM].realreg = SPARC_L1_REGNUM; |
| 116 | |
| 117 | /* The remaining `out' registers can be found in the current frame's |
| 118 | `in' registers. */ |
| 119 | delta = SPARC_I0_REGNUM - SPARC_O0_REGNUM; |
| 120 | for (regnum = SPARC_O1_REGNUM; regnum <= SPARC_O5_REGNUM; regnum++) |
| 121 | saved_regs[regnum].realreg = regnum + delta; |
| 122 | saved_regs[SPARC_O7_REGNUM].realreg = SPARC_I7_REGNUM; |
| 123 | |
| 124 | /* The `local' and `in' registers have been saved in the register |
| 125 | save area. */ |
| 126 | addr = saved_regs[SPARC_SP_REGNUM].addr; |
| 127 | sp = get_frame_memory_unsigned (this_frame, addr, 8); |
| 128 | for (regnum = SPARC_L0_REGNUM, addr = sp + BIAS; |
| 129 | regnum <= SPARC_I7_REGNUM; regnum++, addr += 8) |
| 130 | saved_regs[regnum].addr = addr; |
| 131 | |
| 132 | /* Handle StackGhost. */ |
| 133 | { |
| 134 | ULONGEST wcookie = sparc_fetch_wcookie (gdbarch); |
| 135 | |
| 136 | if (wcookie != 0) |
| 137 | { |
| 138 | ULONGEST i7; |
| 139 | |
| 140 | addr = saved_regs[SPARC_I7_REGNUM].addr; |
| 141 | i7 = get_frame_memory_unsigned (this_frame, addr, 8); |
| 142 | trad_frame_set_value (saved_regs, SPARC_I7_REGNUM, i7 ^ wcookie); |
| 143 | } |
| 144 | } |
| 145 | |
| 146 | /* TODO: Handle the floating-point registers. */ |
| 147 | |
| 148 | return saved_regs; |
| 149 | } |
| 150 | |
| 151 | static struct sparc_frame_cache * |
| 152 | sparc64nbsd_sigcontext_frame_cache (struct frame_info *this_frame, |
| 153 | void **this_cache) |
| 154 | { |
| 155 | struct sparc_frame_cache *cache; |
| 156 | CORE_ADDR addr; |
| 157 | |
| 158 | if (*this_cache) |
| 159 | return (struct sparc_frame_cache *) *this_cache; |
| 160 | |
| 161 | cache = sparc_frame_cache (this_frame, this_cache); |
| 162 | gdb_assert (cache == *this_cache); |
| 163 | |
| 164 | /* If we couldn't find the frame's function, we're probably dealing |
| 165 | with an on-stack signal trampoline. */ |
| 166 | if (cache->pc == 0) |
| 167 | { |
| 168 | cache->pc = sparc64nbsd_sigtramp_start; |
| 169 | |
| 170 | /* Since we couldn't find the frame's function, the cache was |
| 171 | initialized under the assumption that we're frameless. */ |
| 172 | sparc_record_save_insn (cache); |
| 173 | addr = get_frame_register_unsigned (this_frame, SPARC_FP_REGNUM); |
| 174 | if (addr & 1) |
| 175 | addr += BIAS; |
| 176 | cache->base = addr; |
| 177 | } |
| 178 | |
| 179 | /* We find the appropriate instance of `struct sigcontext' at a |
| 180 | fixed offset in the signal frame. */ |
| 181 | addr = cache->base + 128 + 8; |
| 182 | cache->saved_regs = sparc64nbsd_sigcontext_saved_regs (addr, this_frame); |
| 183 | |
| 184 | return cache; |
| 185 | } |
| 186 | |
| 187 | static void |
| 188 | sparc64nbsd_sigcontext_frame_this_id (struct frame_info *this_frame, |
| 189 | void **this_cache, |
| 190 | struct frame_id *this_id) |
| 191 | { |
| 192 | struct sparc_frame_cache *cache = |
| 193 | sparc64nbsd_sigcontext_frame_cache (this_frame, this_cache); |
| 194 | |
| 195 | (*this_id) = frame_id_build (cache->base, cache->pc); |
| 196 | } |
| 197 | |
| 198 | static struct value * |
| 199 | sparc64nbsd_sigcontext_frame_prev_register (struct frame_info *this_frame, |
| 200 | void **this_cache, int regnum) |
| 201 | { |
| 202 | struct sparc_frame_cache *cache = |
| 203 | sparc64nbsd_sigcontext_frame_cache (this_frame, this_cache); |
| 204 | |
| 205 | return trad_frame_get_prev_register (this_frame, cache->saved_regs, regnum); |
| 206 | } |
| 207 | |
| 208 | static int |
| 209 | sparc64nbsd_sigtramp_frame_sniffer (const struct frame_unwind *self, |
| 210 | struct frame_info *this_frame, |
| 211 | void **this_cache) |
| 212 | { |
| 213 | CORE_ADDR pc = get_frame_pc (this_frame); |
| 214 | const char *name; |
| 215 | |
| 216 | find_pc_partial_function (pc, &name, NULL, NULL); |
| 217 | if (sparc64nbsd_pc_in_sigtramp (pc, name)) |
| 218 | { |
| 219 | if (name == NULL || !startswith (name, "__sigtramp_sigcontext")) |
| 220 | return 1; |
| 221 | } |
| 222 | |
| 223 | return 0; |
| 224 | } |
| 225 | |
| 226 | static const struct frame_unwind sparc64nbsd_sigcontext_frame_unwind = |
| 227 | { |
| 228 | SIGTRAMP_FRAME, |
| 229 | default_frame_unwind_stop_reason, |
| 230 | sparc64nbsd_sigcontext_frame_this_id, |
| 231 | sparc64nbsd_sigcontext_frame_prev_register, |
| 232 | NULL, |
| 233 | sparc64nbsd_sigtramp_frame_sniffer |
| 234 | }; |
| 235 | \f |
| 236 | |
| 237 | static const struct regset sparc64nbsd_gregset = |
| 238 | { |
| 239 | NULL, sparc64nbsd_supply_gregset, NULL |
| 240 | }; |
| 241 | |
| 242 | static const struct regset sparc64nbsd_fpregset = |
| 243 | { |
| 244 | NULL, sparc64nbsd_supply_fpregset, NULL |
| 245 | }; |
| 246 | |
| 247 | static void |
| 248 | sparc64nbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) |
| 249 | { |
| 250 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 251 | |
| 252 | tdep->gregset = &sparc64nbsd_gregset; |
| 253 | tdep->sizeof_gregset = 160; |
| 254 | |
| 255 | tdep->fpregset = &sparc64nbsd_fpregset; |
| 256 | tdep->sizeof_fpregset = 272; |
| 257 | |
| 258 | /* Make sure we can single-step "new" syscalls. */ |
| 259 | tdep->step_trap = sparcnbsd_step_trap; |
| 260 | |
| 261 | frame_unwind_append_unwinder (gdbarch, &sparc64nbsd_sigcontext_frame_unwind); |
| 262 | |
| 263 | sparc64_init_abi (info, gdbarch); |
| 264 | |
| 265 | /* NetBSD/sparc64 has SVR4-style shared libraries. */ |
| 266 | set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target); |
| 267 | set_solib_svr4_fetch_link_map_offsets |
| 268 | (gdbarch, svr4_lp64_fetch_link_map_offsets); |
| 269 | } |
| 270 | \f |
| 271 | |
| 272 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
| 273 | void _initialize_sparc64nbsd_tdep (void); |
| 274 | |
| 275 | void |
| 276 | _initialize_sparc64nbsd_tdep (void) |
| 277 | { |
| 278 | gdbarch_register_osabi (bfd_arch_sparc, bfd_mach_sparc_v9, |
| 279 | GDB_OSABI_NETBSD_ELF, sparc64nbsd_init_abi); |
| 280 | } |