1 /* Target-dependent code for FreeBSD/sparc64. 2 3 Copyright (C) 2003-2019 Free Software Foundation, 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 3 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, see <http://www.gnu.org/licenses/>. */ 19 20 #include "defs.h" 21 #include "frame.h" 22 #include "frame-unwind.h" 23 #include "gdbcore.h" 24 #include "osabi.h" 25 #include "regcache.h" 26 #include "regset.h" 27 #include "target.h" 28 #include "trad-frame.h" 29 30 #include "sparc64-tdep.h" 31 #include "fbsd-tdep.h" 32 #include "solib-svr4.h" 33 34 /* From <machine/reg.h>. */ 35 const struct sparc_gregmap sparc64fbsd_gregmap = 36 { 37 26 * 8, /* "tstate" */ 38 25 * 8, /* %pc */ 39 24 * 8, /* %npc */ 40 28 * 8, /* %y */ 41 16 * 8, /* %fprs */ 42 -1, 43 1 * 8, /* %g1 */ 44 -1, /* %l0 */ 45 8 /* sizeof (%y) */ 46 }; 47 48 49 static void 50 sparc64fbsd_supply_gregset (const struct regset *regset, 51 struct regcache *regcache, 52 int regnum, const void *gregs, size_t len) 53 { 54 sparc64_supply_gregset (&sparc64fbsd_gregmap, regcache, regnum, gregs); 55 } 56 57 static void 58 sparc64fbsd_collect_gregset (const struct regset *regset, 59 const struct regcache *regcache, 60 int regnum, void *gregs, size_t len) 61 { 62 sparc64_collect_gregset (&sparc64fbsd_gregmap, regcache, regnum, gregs); 63 } 64 65 static void 66 sparc64fbsd_supply_fpregset (const struct regset *regset, 67 struct regcache *regcache, 68 int regnum, const void *fpregs, size_t len) 69 { 70 sparc64_supply_fpregset (&sparc64_bsd_fpregmap, regcache, regnum, fpregs); 71 } 72 73 static void 74 sparc64fbsd_collect_fpregset (const struct regset *regset, 75 const struct regcache *regcache, 76 int regnum, void *fpregs, size_t len) 77 { 78 sparc64_collect_fpregset (&sparc64_bsd_fpregmap, regcache, regnum, fpregs); 79 } 80 81 82 /* Signal trampolines. */ 83 84 static int 85 sparc64fbsd_pc_in_sigtramp (CORE_ADDR pc, const char *name) 86 { 87 return (name && strcmp (name, "__sigtramp") == 0); 88 } 89 90 static struct sparc_frame_cache * 91 sparc64fbsd_sigtramp_frame_cache (struct frame_info *this_frame, 92 void **this_cache) 93 { 94 struct sparc_frame_cache *cache; 95 CORE_ADDR addr, mcontext_addr, sp; 96 LONGEST fprs; 97 int regnum; 98 99 if (*this_cache) 100 return (struct sparc_frame_cache *) *this_cache; 101 102 cache = sparc_frame_cache (this_frame, this_cache); 103 gdb_assert (cache == *this_cache); 104 105 cache->saved_regs = trad_frame_alloc_saved_regs (this_frame); 106 107 /* The third argument is a pointer to an instance of `ucontext_t', 108 which has a member `uc_mcontext' that contains the saved 109 registers. */ 110 addr = get_frame_register_unsigned (this_frame, SPARC_O2_REGNUM); 111 mcontext_addr = addr + 64; 112 113 /* The following registers travel in the `mc_local' slots of 114 `mcontext_t'. */ 115 addr = mcontext_addr + 16 * 8; 116 cache->saved_regs[SPARC64_FPRS_REGNUM].addr = addr + 0 * 8; 117 cache->saved_regs[SPARC64_FSR_REGNUM].addr = addr + 1 * 8; 118 119 /* The following registers travel in the `mc_in' slots of 120 `mcontext_t'. */ 121 addr = mcontext_addr + 24 * 8; 122 cache->saved_regs[SPARC64_NPC_REGNUM].addr = addr + 0 * 8; 123 cache->saved_regs[SPARC64_PC_REGNUM].addr = addr + 1 * 8; 124 cache->saved_regs[SPARC64_STATE_REGNUM].addr = addr + 2 * 8; 125 cache->saved_regs[SPARC64_Y_REGNUM].addr = addr + 4 * 8; 126 127 /* The `global' and `out' registers travel in the `mc_global' and 128 `mc_out' slots of `mcontext_t', except for %g0. Since %g0 is 129 always zero, keep the identity encoding. */ 130 for (regnum = SPARC_G1_REGNUM, addr = mcontext_addr + 8; 131 regnum <= SPARC_O7_REGNUM; regnum++, addr += 8) 132 cache->saved_regs[regnum].addr = addr; 133 134 /* The `local' and `in' registers have been saved in the register 135 save area. */ 136 addr = cache->saved_regs[SPARC_SP_REGNUM].addr; 137 sp = get_frame_memory_unsigned (this_frame, addr, 8); 138 for (regnum = SPARC_L0_REGNUM, addr = sp + BIAS; 139 regnum <= SPARC_I7_REGNUM; regnum++, addr += 8) 140 cache->saved_regs[regnum].addr = addr; 141 142 /* The floating-point registers are only saved if the FEF bit in 143 %fprs has been set. */ 144 145 #define FPRS_FEF (1 << 2) 146 147 addr = cache->saved_regs[SPARC64_FPRS_REGNUM].addr; 148 fprs = get_frame_memory_unsigned (this_frame, addr, 8); 149 if (fprs & FPRS_FEF) 150 { 151 for (regnum = SPARC_F0_REGNUM, addr = mcontext_addr + 32 * 8; 152 regnum <= SPARC_F31_REGNUM; regnum++, addr += 4) 153 cache->saved_regs[regnum].addr = addr; 154 155 for (regnum = SPARC64_F32_REGNUM; 156 regnum <= SPARC64_F62_REGNUM; regnum++, addr += 8) 157 cache->saved_regs[regnum].addr = addr; 158 } 159 160 return cache; 161 } 162 163 static void 164 sparc64fbsd_sigtramp_frame_this_id (struct frame_info *this_frame, 165 void **this_cache, 166 struct frame_id *this_id) 167 { 168 struct sparc_frame_cache *cache = 169 sparc64fbsd_sigtramp_frame_cache (this_frame, this_cache); 170 171 (*this_id) = frame_id_build (cache->base, cache->pc); 172 } 173 174 static struct value * 175 sparc64fbsd_sigtramp_frame_prev_register (struct frame_info *this_frame, 176 void **this_cache, int regnum) 177 { 178 struct sparc_frame_cache *cache = 179 sparc64fbsd_sigtramp_frame_cache (this_frame, this_cache); 180 181 return trad_frame_get_prev_register (this_frame, cache->saved_regs, regnum); 182 } 183 184 static int 185 sparc64fbsd_sigtramp_frame_sniffer (const struct frame_unwind *self, 186 struct frame_info *this_frame, 187 void **this_cache) 188 { 189 CORE_ADDR pc = get_frame_pc (this_frame); 190 const char *name; 191 192 find_pc_partial_function (pc, &name, NULL, NULL); 193 if (sparc64fbsd_pc_in_sigtramp (pc, name)) 194 return 1; 195 196 return 0; 197 } 198 199 static const struct frame_unwind sparc64fbsd_sigtramp_frame_unwind = 200 { 201 SIGTRAMP_FRAME, 202 default_frame_unwind_stop_reason, 203 sparc64fbsd_sigtramp_frame_this_id, 204 sparc64fbsd_sigtramp_frame_prev_register, 205 NULL, 206 sparc64fbsd_sigtramp_frame_sniffer 207 }; 208 209 210 static const struct regset sparc64fbsd_gregset = 211 { 212 NULL, sparc64fbsd_supply_gregset, sparc64fbsd_collect_gregset 213 }; 214 215 static const struct regset sparc64fbsd_fpregset = 216 { 217 NULL, sparc64fbsd_supply_fpregset, sparc64fbsd_collect_fpregset 218 }; 219 220 static void 221 sparc64fbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) 222 { 223 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); 224 225 /* Generic FreeBSD support. */ 226 fbsd_init_abi (info, gdbarch); 227 228 tdep->gregset = &sparc64fbsd_gregset; 229 tdep->sizeof_gregset = 256; 230 231 tdep->fpregset = &sparc64fbsd_fpregset; 232 tdep->sizeof_fpregset = 272; 233 234 frame_unwind_append_unwinder (gdbarch, &sparc64fbsd_sigtramp_frame_unwind); 235 236 sparc64_init_abi (info, gdbarch); 237 238 /* FreeBSD/sparc64 has SVR4-style shared libraries. */ 239 set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target); 240 set_solib_svr4_fetch_link_map_offsets 241 (gdbarch, svr4_lp64_fetch_link_map_offsets); 242 } 243 244 void 245 _initialize_sparc64fbsd_tdep (void) 246 { 247 gdbarch_register_osabi (bfd_arch_sparc, bfd_mach_sparc_v9, 248 GDB_OSABI_FREEBSD, sparc64fbsd_init_abi); 249 } 250