gdb/sparc64fbsd-tdep.c

   1 /* Target-dependent code for FreeBSD/sparc64.
   2
   3    Copyright (C) 2003-2013 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 "gdb_assert.h"
  31 #include "gdb_string.h"
  32
  33 #include "sparc64-tdep.h"
  34 #include "solib-svr4.h"
  35
  36 /* From <machine/reg.h>.  */
  37 const struct sparc_gregset sparc64fbsd_gregset =
  38 {
  39   26 * 8,                       /* "tstate" */
  40   25 * 8,                       /* %pc */
  41   24 * 8,                       /* %npc */
  42   28 * 8,                       /* %y */
  43   16 * 8,                       /* %fprs */
  44   -1,
  45   1 * 8,                        /* %g1 */
  46   -1,                           /* %l0 */
  47   8                             /* sizeof (%y) */
  48 };
  49 \f
  50
  51 static void
  52 sparc64fbsd_supply_gregset (const struct regset *regset,
  53                             struct regcache *regcache,
  54                             int regnum, const void *gregs, size_t len)
  55 {
  56   sparc64_supply_gregset (&sparc64fbsd_gregset, regcache, regnum, gregs);
  57 }
  58
  59 static void
  60 sparc64fbsd_collect_gregset (const struct regset *regset,
  61                              const struct regcache *regcache,
  62                              int regnum, void *gregs, size_t len)
  63 {
  64   sparc64_collect_gregset (&sparc64fbsd_gregset, regcache, regnum, gregs);
  65 }
  66
  67 static void
  68 sparc64fbsd_supply_fpregset (const struct regset *regset,
  69                              struct regcache *regcache,
  70                              int regnum, const void *fpregs, size_t len)
  71 {
  72   sparc64_supply_fpregset (&sparc64_bsd_fpregset, regcache, regnum, fpregs);
  73 }
  74
  75 static void
  76 sparc64fbsd_collect_fpregset (const struct regset *regset,
  77                               const struct regcache *regcache,
  78                               int regnum, void *fpregs, size_t len)
  79 {
  80   sparc64_collect_fpregset (&sparc64_bsd_fpregset, regcache, regnum, fpregs);
  81 }
  82 \f
  83
  84 /* Signal trampolines.  */
  85
  86 static int
  87 sparc64fbsd_pc_in_sigtramp (CORE_ADDR pc, const char *name)
  88 {
  89   return (name && strcmp (name, "__sigtramp") == 0);
  90 }
  91
  92 static struct sparc_frame_cache *
  93 sparc64fbsd_sigtramp_frame_cache (struct frame_info *this_frame,
  94                                    void **this_cache)
  95 {
  96   struct sparc_frame_cache *cache;
  97   CORE_ADDR addr, mcontext_addr, sp;
  98   LONGEST fprs;
  99   int regnum;
 100
 101   if (*this_cache)
 102     return *this_cache;
 103
 104   cache = sparc_frame_cache (this_frame, this_cache);
 105   gdb_assert (cache == *this_cache);
 106
 107   cache->saved_regs = trad_frame_alloc_saved_regs (this_frame);
 108
 109   /* The third argument is a pointer to an instance of `ucontext_t',
 110      which has a member `uc_mcontext' that contains the saved
 111      registers.  */
 112   addr = get_frame_register_unsigned (this_frame, SPARC_O2_REGNUM);
 113   mcontext_addr = addr + 64;
 114
 115   /* The following registers travel in the `mc_local' slots of
 116      `mcontext_t'.  */
 117   addr = mcontext_addr + 16 * 8;
 118   cache->saved_regs[SPARC64_FPRS_REGNUM].addr = addr + 0 * 8;
 119   cache->saved_regs[SPARC64_FSR_REGNUM].addr = addr + 1 * 8;
 120
 121   /* The following registers travel in the `mc_in' slots of
 122      `mcontext_t'.  */
 123   addr = mcontext_addr + 24 * 8;
 124   cache->saved_regs[SPARC64_NPC_REGNUM].addr = addr + 0 * 8;
 125   cache->saved_regs[SPARC64_PC_REGNUM].addr = addr + 1 * 8;
 126   cache->saved_regs[SPARC64_STATE_REGNUM].addr = addr + 2 * 8;
 127   cache->saved_regs[SPARC64_Y_REGNUM].addr = addr + 4 * 8;
 128
 129   /* The `global' and `out' registers travel in the `mc_global' and
 130      `mc_out' slots of `mcontext_t', except for %g0.  Since %g0 is
 131      always zero, keep the identity encoding.  */
 132   for (regnum = SPARC_G1_REGNUM, addr = mcontext_addr + 8;
 133        regnum <= SPARC_O7_REGNUM; regnum++, addr += 8)
 134     cache->saved_regs[regnum].addr = addr;
 135
 136   /* The `local' and `in' registers have been saved in the register
 137      save area.  */
 138   addr = cache->saved_regs[SPARC_SP_REGNUM].addr;
 139   sp = get_frame_memory_unsigned (this_frame, addr, 8);
 140   for (regnum = SPARC_L0_REGNUM, addr = sp + BIAS;
 141        regnum <= SPARC_I7_REGNUM; regnum++, addr += 8)
 142     cache->saved_regs[regnum].addr = addr;
 143
 144   /* The floating-point registers are only saved if the FEF bit in
 145      %fprs has been set.  */
 146
 147 #define FPRS_FEF        (1 << 2)
 148
 149   addr = cache->saved_regs[SPARC64_FPRS_REGNUM].addr;
 150   fprs = get_frame_memory_unsigned (this_frame, addr, 8);
 151   if (fprs & FPRS_FEF)
 152     {
 153       for (regnum = SPARC_F0_REGNUM, addr = mcontext_addr + 32 * 8;
 154            regnum <= SPARC_F31_REGNUM; regnum++, addr += 4)
 155         cache->saved_regs[regnum].addr = addr;
 156
 157       for (regnum = SPARC64_F32_REGNUM;
 158            regnum <= SPARC64_F62_REGNUM; regnum++, addr += 8)
 159         cache->saved_regs[regnum].addr = addr;
 160     }
 161
 162   return cache;
 163 }
 164
 165 static void
 166 sparc64fbsd_sigtramp_frame_this_id (struct frame_info *this_frame,
 167                                     void **this_cache,
 168                                     struct frame_id *this_id)
 169 {
 170   struct sparc_frame_cache *cache =
 171     sparc64fbsd_sigtramp_frame_cache (this_frame, this_cache);
 172
 173   (*this_id) = frame_id_build (cache->base, cache->pc);
 174 }
 175
 176 static struct value *
 177 sparc64fbsd_sigtramp_frame_prev_register (struct frame_info *this_frame,
 178                                           void **this_cache, int regnum)
 179 {
 180   struct sparc_frame_cache *cache =
 181     sparc64fbsd_sigtramp_frame_cache (this_frame, this_cache);
 182
 183   return trad_frame_get_prev_register (this_frame, cache->saved_regs, regnum);
 184 }
 185
 186 static int
 187 sparc64fbsd_sigtramp_frame_sniffer (const struct frame_unwind *self,
 188                                     struct frame_info *this_frame,
 189                                     void **this_cache)
 190 {
 191   CORE_ADDR pc = get_frame_pc (this_frame);
 192   const char *name;
 193
 194   find_pc_partial_function (pc, &name, NULL, NULL);
 195   if (sparc64fbsd_pc_in_sigtramp (pc, name))
 196     return 1;
 197
 198   return 0;
 199 }
 200
 201 static const struct frame_unwind sparc64fbsd_sigtramp_frame_unwind =
 202 {
 203   SIGTRAMP_FRAME,
 204   default_frame_unwind_stop_reason,
 205   sparc64fbsd_sigtramp_frame_this_id,
 206   sparc64fbsd_sigtramp_frame_prev_register,
 207   NULL,
 208   sparc64fbsd_sigtramp_frame_sniffer
 209 };
 210 \f
 211
 212 static void
 213 sparc64fbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 214 {
 215   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
 216
 217   tdep->gregset = regset_alloc (gdbarch, sparc64fbsd_supply_gregset,
 218                                 sparc64fbsd_collect_gregset);
 219   tdep->sizeof_gregset = 256;
 220
 221   tdep->fpregset = regset_alloc (gdbarch, sparc64fbsd_supply_fpregset,
 222                                  sparc64fbsd_collect_fpregset);
 223   tdep->sizeof_fpregset = 272;
 224
 225   frame_unwind_append_unwinder (gdbarch, &sparc64fbsd_sigtramp_frame_unwind);
 226
 227   sparc64_init_abi (info, gdbarch);
 228
 229   /* FreeBSD/sparc64 has SVR4-style shared libraries.  */
 230   set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target);
 231   set_solib_svr4_fetch_link_map_offsets
 232     (gdbarch, svr4_lp64_fetch_link_map_offsets);
 233 }
 234
 235 /* Provide a prototype to silence -Wmissing-prototypes.  */
 236 void _initialize_sparc64fbsd_tdep (void);
 237
 238 void
 239 _initialize_sparc64fbsd_tdep (void)
 240 {
 241   gdbarch_register_osabi (bfd_arch_sparc, bfd_mach_sparc_v9,
 242                           GDB_OSABI_FREEBSD_ELF, sparc64fbsd_init_abi);
 243 }