gdb/sparc64fbsd-tdep.c

   1 /* Target-dependent code for FreeBSD/sparc64.
   2
   3    Copyright (C) 2003-2014 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 "solib-svr4.h"
  32
  33 /* From <machine/reg.h>.  */
  34 const struct sparc_gregmap sparc64fbsd_gregmap =
  35 {
  36   26 * 8,                       /* "tstate" */
  37   25 * 8,                       /* %pc */
  38   24 * 8,                       /* %npc */
  39   28 * 8,                       /* %y */
  40   16 * 8,                       /* %fprs */
  41   -1,
  42   1 * 8,                        /* %g1 */
  43   -1,                           /* %l0 */
  44   8                             /* sizeof (%y) */
  45 };
  46 \f
  47
  48 static void
  49 sparc64fbsd_supply_gregset (const struct regset *regset,
  50                             struct regcache *regcache,
  51                             int regnum, const void *gregs, size_t len)
  52 {
  53   sparc64_supply_gregset (&sparc64fbsd_gregmap, regcache, regnum, gregs);
  54 }
  55
  56 static void
  57 sparc64fbsd_collect_gregset (const struct regset *regset,
  58                              const struct regcache *regcache,
  59                              int regnum, void *gregs, size_t len)
  60 {
  61   sparc64_collect_gregset (&sparc64fbsd_gregmap, regcache, regnum, gregs);
  62 }
  63
  64 static void
  65 sparc64fbsd_supply_fpregset (const struct regset *regset,
  66                              struct regcache *regcache,
  67                              int regnum, const void *fpregs, size_t len)
  68 {
  69   sparc64_supply_fpregset (&sparc64_bsd_fpregmap, regcache, regnum, fpregs);
  70 }
  71
  72 static void
  73 sparc64fbsd_collect_fpregset (const struct regset *regset,
  74                               const struct regcache *regcache,
  75                               int regnum, void *fpregs, size_t len)
  76 {
  77   sparc64_collect_fpregset (&sparc64_bsd_fpregmap, regcache, regnum, fpregs);
  78 }
  79 \f
  80
  81 /* Signal trampolines.  */
  82
  83 static int
  84 sparc64fbsd_pc_in_sigtramp (CORE_ADDR pc, const char *name)
  85 {
  86   return (name && strcmp (name, "__sigtramp") == 0);
  87 }
  88
  89 static struct sparc_frame_cache *
  90 sparc64fbsd_sigtramp_frame_cache (struct frame_info *this_frame,
  91                                    void **this_cache)
  92 {
  93   struct sparc_frame_cache *cache;
  94   CORE_ADDR addr, mcontext_addr, sp;
  95   LONGEST fprs;
  96   int regnum;
  97
  98   if (*this_cache)
  99     return *this_cache;
 100
 101   cache = sparc_frame_cache (this_frame, this_cache);
 102   gdb_assert (cache == *this_cache);
 103
 104   cache->saved_regs = trad_frame_alloc_saved_regs (this_frame);
 105
 106   /* The third argument is a pointer to an instance of `ucontext_t',
 107      which has a member `uc_mcontext' that contains the saved
 108      registers.  */
 109   addr = get_frame_register_unsigned (this_frame, SPARC_O2_REGNUM);
 110   mcontext_addr = addr + 64;
 111
 112   /* The following registers travel in the `mc_local' slots of
 113      `mcontext_t'.  */
 114   addr = mcontext_addr + 16 * 8;
 115   cache->saved_regs[SPARC64_FPRS_REGNUM].addr = addr + 0 * 8;
 116   cache->saved_regs[SPARC64_FSR_REGNUM].addr = addr + 1 * 8;
 117
 118   /* The following registers travel in the `mc_in' slots of
 119      `mcontext_t'.  */
 120   addr = mcontext_addr + 24 * 8;
 121   cache->saved_regs[SPARC64_NPC_REGNUM].addr = addr + 0 * 8;
 122   cache->saved_regs[SPARC64_PC_REGNUM].addr = addr + 1 * 8;
 123   cache->saved_regs[SPARC64_STATE_REGNUM].addr = addr + 2 * 8;
 124   cache->saved_regs[SPARC64_Y_REGNUM].addr = addr + 4 * 8;
 125
 126   /* The `global' and `out' registers travel in the `mc_global' and
 127      `mc_out' slots of `mcontext_t', except for %g0.  Since %g0 is
 128      always zero, keep the identity encoding.  */
 129   for (regnum = SPARC_G1_REGNUM, addr = mcontext_addr + 8;
 130        regnum <= SPARC_O7_REGNUM; regnum++, addr += 8)
 131     cache->saved_regs[regnum].addr = addr;
 132
 133   /* The `local' and `in' registers have been saved in the register
 134      save area.  */
 135   addr = cache->saved_regs[SPARC_SP_REGNUM].addr;
 136   sp = get_frame_memory_unsigned (this_frame, addr, 8);
 137   for (regnum = SPARC_L0_REGNUM, addr = sp + BIAS;
 138        regnum <= SPARC_I7_REGNUM; regnum++, addr += 8)
 139     cache->saved_regs[regnum].addr = addr;
 140
 141   /* The floating-point registers are only saved if the FEF bit in
 142      %fprs has been set.  */
 143
 144 #define FPRS_FEF        (1 << 2)
 145
 146   addr = cache->saved_regs[SPARC64_FPRS_REGNUM].addr;
 147   fprs = get_frame_memory_unsigned (this_frame, addr, 8);
 148   if (fprs & FPRS_FEF)
 149     {
 150       for (regnum = SPARC_F0_REGNUM, addr = mcontext_addr + 32 * 8;
 151            regnum <= SPARC_F31_REGNUM; regnum++, addr += 4)
 152         cache->saved_regs[regnum].addr = addr;
 153
 154       for (regnum = SPARC64_F32_REGNUM;
 155            regnum <= SPARC64_F62_REGNUM; regnum++, addr += 8)
 156         cache->saved_regs[regnum].addr = addr;
 157     }
 158
 159   return cache;
 160 }
 161
 162 static void
 163 sparc64fbsd_sigtramp_frame_this_id (struct frame_info *this_frame,
 164                                     void **this_cache,
 165                                     struct frame_id *this_id)
 166 {
 167   struct sparc_frame_cache *cache =
 168     sparc64fbsd_sigtramp_frame_cache (this_frame, this_cache);
 169
 170   (*this_id) = frame_id_build (cache->base, cache->pc);
 171 }
 172
 173 static struct value *
 174 sparc64fbsd_sigtramp_frame_prev_register (struct frame_info *this_frame,
 175                                           void **this_cache, int regnum)
 176 {
 177   struct sparc_frame_cache *cache =
 178     sparc64fbsd_sigtramp_frame_cache (this_frame, this_cache);
 179
 180   return trad_frame_get_prev_register (this_frame, cache->saved_regs, regnum);
 181 }
 182
 183 static int
 184 sparc64fbsd_sigtramp_frame_sniffer (const struct frame_unwind *self,
 185                                     struct frame_info *this_frame,
 186                                     void **this_cache)
 187 {
 188   CORE_ADDR pc = get_frame_pc (this_frame);
 189   const char *name;
 190
 191   find_pc_partial_function (pc, &name, NULL, NULL);
 192   if (sparc64fbsd_pc_in_sigtramp (pc, name))
 193     return 1;
 194
 195   return 0;
 196 }
 197
 198 static const struct frame_unwind sparc64fbsd_sigtramp_frame_unwind =
 199 {
 200   SIGTRAMP_FRAME,
 201   default_frame_unwind_stop_reason,
 202   sparc64fbsd_sigtramp_frame_this_id,
 203   sparc64fbsd_sigtramp_frame_prev_register,
 204   NULL,
 205   sparc64fbsd_sigtramp_frame_sniffer
 206 };
 207 \f
 208
 209 static const struct regset sparc64fbsd_gregset =
 210   {
 211     NULL, sparc64fbsd_supply_gregset, sparc64fbsd_collect_gregset
 212   };
 213
 214 static const struct regset sparc64fbsd_fpregset =
 215   {
 216     NULL, sparc64fbsd_supply_fpregset, sparc64fbsd_collect_fpregset
 217   };
 218
 219 static void
 220 sparc64fbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 221 {
 222   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
 223
 224   tdep->gregset = &sparc64fbsd_gregset;
 225   tdep->sizeof_gregset = 256;
 226
 227   tdep->fpregset = &sparc64fbsd_fpregset;
 228   tdep->sizeof_fpregset = 272;
 229
 230   frame_unwind_append_unwinder (gdbarch, &sparc64fbsd_sigtramp_frame_unwind);
 231
 232   sparc64_init_abi (info, gdbarch);
 233
 234   /* FreeBSD/sparc64 has SVR4-style shared libraries.  */
 235   set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target);
 236   set_solib_svr4_fetch_link_map_offsets
 237     (gdbarch, svr4_lp64_fetch_link_map_offsets);
 238 }
 239
 240 /* Provide a prototype to silence -Wmissing-prototypes.  */
 241 void _initialize_sparc64fbsd_tdep (void);
 242
 243 void
 244 _initialize_sparc64fbsd_tdep (void)
 245 {
 246   gdbarch_register_osabi (bfd_arch_sparc, bfd_mach_sparc_v9,
 247                           GDB_OSABI_FREEBSD_ELF, sparc64fbsd_init_abi);
 248 }