1 /* Target-dependent code for FreeBSD/sparc64. 2 3 Copyright 2003, 2004 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 2 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, write to the Free Software 19 Foundation, Inc., 59 Temple Place - Suite 330, 20 Boston, MA 02111-1307, USA. */ 21 22 #include "defs.h" 23 #include "frame.h" 24 #include "frame-unwind.h" 25 #include "gdbcore.h" 26 #include "osabi.h" 27 #include "regcache.h" 28 #include "regset.h" 29 #include "target.h" 30 #include "trad-frame.h" 31 32 #include "gdb_assert.h" 33 #include "gdb_string.h" 34 35 #include "sparc64-tdep.h" 36 37 /* From <machine/reg.h>. */ 38 const struct sparc_gregset sparc64fbsd_gregset = 39 { 40 26 * 8, /* "tstate" */ 41 25 * 8, /* %pc */ 42 24 * 8, /* %npc */ 43 28 * 8, /* %y */ 44 16 * 8, /* %fprs */ 45 -1, 46 1 * 8, /* %g1 */ 47 -1, /* %l0 */ 48 8 /* sizeof (%y) */ 49 }; 50 51 52 static void 53 sparc64fbsd_supply_gregset (const struct regset *regset, 54 struct regcache *regcache, 55 int regnum, const void *gregs, size_t len) 56 { 57 sparc64_supply_gregset (&sparc64fbsd_gregset, regcache, regnum, gregs); 58 } 59 60 static void 61 sparc64fbsd_supply_fpregset (const struct regset *regset, 62 struct regcache *regcache, 63 int regnum, const void *fpregs, size_t len) 64 { 65 sparc64_supply_fpregset (regcache, regnum, fpregs); 66 } 67 68 69 /* Signal trampolines. */ 70 71 static int 72 sparc64fbsd_pc_in_sigtramp (CORE_ADDR pc, char *name) 73 { 74 return (name && strcmp (name, "__sigtramp") == 0); 75 } 76 77 static struct sparc_frame_cache * 78 sparc64fbsd_sigtramp_frame_cache (struct frame_info *next_frame, 79 void **this_cache) 80 { 81 struct sparc_frame_cache *cache; 82 CORE_ADDR addr, mcontext_addr, sp; 83 LONGEST fprs; 84 int regnum; 85 86 if (*this_cache) 87 return *this_cache; 88 89 cache = sparc_frame_cache (next_frame, this_cache); 90 gdb_assert (cache == *this_cache); 91 92 cache->saved_regs = trad_frame_alloc_saved_regs (next_frame); 93 94 /* The third argument is a pointer to an instance of `ucontext_t', 95 which has a member `uc_mcontext' that contains the saved 96 registers. */ 97 addr = frame_unwind_register_unsigned (next_frame, SPARC_O2_REGNUM); 98 mcontext_addr = addr + 64; 99 100 /* The following registers travel in the `mc_local' slots of 101 `mcontext_t'. */ 102 addr = mcontext_addr + 16 * 8; 103 cache->saved_regs[SPARC64_FPRS_REGNUM].addr = addr + 0 * 8; 104 cache->saved_regs[SPARC64_FSR_REGNUM].addr = addr + 1 * 8; 105 106 /* The following registers travel in the `mc_in' slots of 107 `mcontext_t'. */ 108 addr = mcontext_addr + 24 * 8; 109 cache->saved_regs[SPARC64_NPC_REGNUM].addr = addr + 0 * 8; 110 cache->saved_regs[SPARC64_PC_REGNUM].addr = addr + 1 * 8; 111 cache->saved_regs[SPARC64_STATE_REGNUM].addr = addr + 2 * 8; 112 cache->saved_regs[SPARC64_Y_REGNUM].addr = addr + 4 * 8; 113 114 /* The `global' and `out' registers travel in the `mc_global' and 115 `mc_out' slots of `mcontext_t', except for %g0. Since %g0 is 116 always zero, keep the identity encoding. */ 117 for (regnum = SPARC_G1_REGNUM, addr = mcontext_addr + 8; 118 regnum <= SPARC_O7_REGNUM; regnum++, addr += 8) 119 cache->saved_regs[regnum].addr = addr; 120 121 /* The `local' and `in' registers have been saved in the register 122 save area. */ 123 addr = cache->saved_regs[SPARC_SP_REGNUM].addr; 124 sp = get_frame_memory_unsigned (next_frame, addr, 8); 125 for (regnum = SPARC_L0_REGNUM, addr = sp + BIAS; 126 regnum <= SPARC_I7_REGNUM; regnum++, addr += 8) 127 cache->saved_regs[regnum].addr = addr; 128 129 /* The floating-point registers are only saved if the FEF bit in 130 %fprs has been set. */ 131 132 #define FPRS_FEF (1 << 2) 133 134 addr = cache->saved_regs[SPARC64_FPRS_REGNUM].addr; 135 fprs = get_frame_memory_unsigned (next_frame, addr, 8); 136 if (fprs & FPRS_FEF) 137 { 138 for (regnum = SPARC_F0_REGNUM, addr = mcontext_addr + 32 * 8; 139 regnum <= SPARC_F31_REGNUM; regnum++, addr += 4) 140 cache->saved_regs[regnum].addr = addr; 141 142 for (regnum = SPARC64_F32_REGNUM; 143 regnum <= SPARC64_F62_REGNUM; regnum++, addr += 8) 144 cache->saved_regs[regnum].addr = addr; 145 } 146 147 return cache; 148 } 149 150 static void 151 sparc64fbsd_sigtramp_frame_this_id (struct frame_info *next_frame, 152 void **this_cache, 153 struct frame_id *this_id) 154 { 155 struct sparc_frame_cache *cache = 156 sparc64fbsd_sigtramp_frame_cache (next_frame, this_cache); 157 158 (*this_id) = frame_id_build (cache->base, cache->pc); 159 } 160 161 static void 162 sparc64fbsd_sigtramp_frame_prev_register (struct frame_info *next_frame, 163 void **this_cache, 164 int regnum, int *optimizedp, 165 enum lval_type *lvalp, 166 CORE_ADDR *addrp, 167 int *realnump, void *valuep) 168 { 169 struct sparc_frame_cache *cache = 170 sparc64fbsd_sigtramp_frame_cache (next_frame, this_cache); 171 172 trad_frame_get_prev_register (next_frame, cache->saved_regs, regnum, 173 optimizedp, lvalp, addrp, realnump, valuep); 174 } 175 176 static const struct frame_unwind sparc64fbsd_sigtramp_frame_unwind = 177 { 178 SIGTRAMP_FRAME, 179 sparc64fbsd_sigtramp_frame_this_id, 180 sparc64fbsd_sigtramp_frame_prev_register 181 }; 182 183 static const struct frame_unwind * 184 sparc64fbsd_sigtramp_frame_sniffer (struct frame_info *next_frame) 185 { 186 CORE_ADDR pc = frame_pc_unwind (next_frame); 187 char *name; 188 189 find_pc_partial_function (pc, &name, NULL, NULL); 190 if (sparc64fbsd_pc_in_sigtramp (pc, name)) 191 return &sparc64fbsd_sigtramp_frame_unwind; 192 193 return NULL; 194 } 195 196 197 static void 198 sparc64fbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) 199 { 200 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); 201 202 tdep->gregset = regset_alloc (gdbarch, sparc64fbsd_supply_gregset, NULL); 203 tdep->sizeof_gregset = 256; 204 205 tdep->fpregset = regset_alloc (gdbarch, sparc64fbsd_supply_fpregset, NULL); 206 tdep->sizeof_fpregset = 272; 207 208 frame_unwind_append_sniffer (gdbarch, sparc64fbsd_sigtramp_frame_sniffer); 209 210 sparc64_init_abi (info, gdbarch); 211 } 212 213 /* Provide a prototype to silence -Wmissing-prototypes. */ 214 void _initialize_sparc64fbsd_tdep (void); 215 216 void 217 _initialize_sparc64fbsd_tdep (void) 218 { 219 gdbarch_register_osabi (bfd_arch_sparc, bfd_mach_sparc_v9, 220 GDB_OSABI_FREEBSD_ELF, sparc64fbsd_init_abi); 221 } 222