1 /* Target-dependent code for FreeBSD/sparc64. 2 3 Copyright (C) 2003-2020 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 #include "gdbarch.h" 34 35 /* From <machine/reg.h>. */ 36 const struct sparc_gregmap sparc64fbsd_gregmap = 37 { 38 26 * 8, /* "tstate" */ 39 25 * 8, /* %pc */ 40 24 * 8, /* %npc */ 41 28 * 8, /* %y */ 42 16 * 8, /* %fprs */ 43 -1, 44 1 * 8, /* %g1 */ 45 -1, /* %l0 */ 46 8 /* sizeof (%y) */ 47 }; 48 49 50 static void 51 sparc64fbsd_supply_gregset (const struct regset *regset, 52 struct regcache *regcache, 53 int regnum, const void *gregs, size_t len) 54 { 55 sparc64_supply_gregset (&sparc64fbsd_gregmap, regcache, regnum, gregs); 56 } 57 58 static void 59 sparc64fbsd_collect_gregset (const struct regset *regset, 60 const struct regcache *regcache, 61 int regnum, void *gregs, size_t len) 62 { 63 sparc64_collect_gregset (&sparc64fbsd_gregmap, regcache, regnum, gregs); 64 } 65 66 static void 67 sparc64fbsd_supply_fpregset (const struct regset *regset, 68 struct regcache *regcache, 69 int regnum, const void *fpregs, size_t len) 70 { 71 sparc64_supply_fpregset (&sparc64_bsd_fpregmap, regcache, regnum, fpregs); 72 } 73 74 static void 75 sparc64fbsd_collect_fpregset (const struct regset *regset, 76 const struct regcache *regcache, 77 int regnum, void *fpregs, size_t len) 78 { 79 sparc64_collect_fpregset (&sparc64_bsd_fpregmap, regcache, regnum, fpregs); 80 } 81 82 83 /* Signal trampolines. */ 84 85 static int 86 sparc64fbsd_pc_in_sigtramp (CORE_ADDR pc, const char *name) 87 { 88 return (name && strcmp (name, "__sigtramp") == 0); 89 } 90 91 static struct sparc_frame_cache * 92 sparc64fbsd_sigtramp_frame_cache (struct frame_info *this_frame, 93 void **this_cache) 94 { 95 struct sparc_frame_cache *cache; 96 CORE_ADDR addr, mcontext_addr, sp; 97 LONGEST fprs; 98 int regnum; 99 100 if (*this_cache) 101 return (struct sparc_frame_cache *) *this_cache; 102 103 cache = sparc_frame_cache (this_frame, this_cache); 104 gdb_assert (cache == *this_cache); 105 106 cache->saved_regs = trad_frame_alloc_saved_regs (this_frame); 107 108 /* The third argument is a pointer to an instance of `ucontext_t', 109 which has a member `uc_mcontext' that contains the saved 110 registers. */ 111 addr = get_frame_register_unsigned (this_frame, SPARC_O2_REGNUM); 112 mcontext_addr = addr + 64; 113 114 /* The following registers travel in the `mc_local' slots of 115 `mcontext_t'. */ 116 addr = mcontext_addr + 16 * 8; 117 cache->saved_regs[SPARC64_FPRS_REGNUM].addr = addr + 0 * 8; 118 cache->saved_regs[SPARC64_FSR_REGNUM].addr = addr + 1 * 8; 119 120 /* The following registers travel in the `mc_in' slots of 121 `mcontext_t'. */ 122 addr = mcontext_addr + 24 * 8; 123 cache->saved_regs[SPARC64_NPC_REGNUM].addr = addr + 0 * 8; 124 cache->saved_regs[SPARC64_PC_REGNUM].addr = addr + 1 * 8; 125 cache->saved_regs[SPARC64_STATE_REGNUM].addr = addr + 2 * 8; 126 cache->saved_regs[SPARC64_Y_REGNUM].addr = addr + 4 * 8; 127 128 /* The `global' and `out' registers travel in the `mc_global' and 129 `mc_out' slots of `mcontext_t', except for %g0. Since %g0 is 130 always zero, keep the identity encoding. */ 131 for (regnum = SPARC_G1_REGNUM, addr = mcontext_addr + 8; 132 regnum <= SPARC_O7_REGNUM; regnum++, addr += 8) 133 cache->saved_regs[regnum].addr = addr; 134 135 /* The `local' and `in' registers have been saved in the register 136 save area. */ 137 addr = cache->saved_regs[SPARC_SP_REGNUM].addr; 138 sp = get_frame_memory_unsigned (this_frame, addr, 8); 139 for (regnum = SPARC_L0_REGNUM, addr = sp + BIAS; 140 regnum <= SPARC_I7_REGNUM; regnum++, addr += 8) 141 cache->saved_regs[regnum].addr = addr; 142 143 /* The floating-point registers are only saved if the FEF bit in 144 %fprs has been set. */ 145 146 #define FPRS_FEF (1 << 2) 147 148 addr = cache->saved_regs[SPARC64_FPRS_REGNUM].addr; 149 fprs = get_frame_memory_unsigned (this_frame, addr, 8); 150 if (fprs & FPRS_FEF) 151 { 152 for (regnum = SPARC_F0_REGNUM, addr = mcontext_addr + 32 * 8; 153 regnum <= SPARC_F31_REGNUM; regnum++, addr += 4) 154 cache->saved_regs[regnum].addr = addr; 155 156 for (regnum = SPARC64_F32_REGNUM; 157 regnum <= SPARC64_F62_REGNUM; regnum++, addr += 8) 158 cache->saved_regs[regnum].addr = addr; 159 } 160 161 return cache; 162 } 163 164 static void 165 sparc64fbsd_sigtramp_frame_this_id (struct frame_info *this_frame, 166 void **this_cache, 167 struct frame_id *this_id) 168 { 169 struct sparc_frame_cache *cache = 170 sparc64fbsd_sigtramp_frame_cache (this_frame, this_cache); 171 172 (*this_id) = frame_id_build (cache->base, cache->pc); 173 } 174 175 static struct value * 176 sparc64fbsd_sigtramp_frame_prev_register (struct frame_info *this_frame, 177 void **this_cache, int regnum) 178 { 179 struct sparc_frame_cache *cache = 180 sparc64fbsd_sigtramp_frame_cache (this_frame, this_cache); 181 182 return trad_frame_get_prev_register (this_frame, cache->saved_regs, regnum); 183 } 184 185 static int 186 sparc64fbsd_sigtramp_frame_sniffer (const struct frame_unwind *self, 187 struct frame_info *this_frame, 188 void **this_cache) 189 { 190 CORE_ADDR pc = get_frame_pc (this_frame); 191 const char *name; 192 193 find_pc_partial_function (pc, &name, NULL, NULL); 194 if (sparc64fbsd_pc_in_sigtramp (pc, name)) 195 return 1; 196 197 return 0; 198 } 199 200 static const struct frame_unwind sparc64fbsd_sigtramp_frame_unwind = 201 { 202 SIGTRAMP_FRAME, 203 default_frame_unwind_stop_reason, 204 sparc64fbsd_sigtramp_frame_this_id, 205 sparc64fbsd_sigtramp_frame_prev_register, 206 NULL, 207 sparc64fbsd_sigtramp_frame_sniffer 208 }; 209 210 211 static const struct regset sparc64fbsd_gregset = 212 { 213 NULL, sparc64fbsd_supply_gregset, sparc64fbsd_collect_gregset 214 }; 215 216 static const struct regset sparc64fbsd_fpregset = 217 { 218 NULL, sparc64fbsd_supply_fpregset, sparc64fbsd_collect_fpregset 219 }; 220 221 static void 222 sparc64fbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) 223 { 224 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); 225 226 /* Generic FreeBSD support. */ 227 fbsd_init_abi (info, gdbarch); 228 229 tdep->gregset = &sparc64fbsd_gregset; 230 tdep->sizeof_gregset = 256; 231 232 tdep->fpregset = &sparc64fbsd_fpregset; 233 tdep->sizeof_fpregset = 272; 234 235 frame_unwind_append_unwinder (gdbarch, &sparc64fbsd_sigtramp_frame_unwind); 236 237 sparc64_init_abi (info, gdbarch); 238 239 /* FreeBSD/sparc64 has SVR4-style shared libraries. */ 240 set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target); 241 set_solib_svr4_fetch_link_map_offsets 242 (gdbarch, svr4_lp64_fetch_link_map_offsets); 243 } 244 245 void _initialize_sparc64fbsd_tdep (); 246 void 247 _initialize_sparc64fbsd_tdep () 248 { 249 gdbarch_register_osabi (bfd_arch_sparc, bfd_mach_sparc_v9, 250 GDB_OSABI_FREEBSD, sparc64fbsd_init_abi); 251 } 252