gdb/sparc64fbsd-tdep.c

   1 /* Target-dependent code for FreeBSD/sparc64.
   2
   3    Copyright (C) 2003, 2004, 2005, 2007, 2008, 2009
   4    Free Software Foundation, Inc.
   5
   6    This file is part of GDB.
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  20
  21 #include "defs.h"
  22 #include "frame.h"
  23 #include "frame-unwind.h"
  24 #include "gdbcore.h"
  25 #include "osabi.h"
  26 #include "regcache.h"
  27 #include "regset.h"
  28 #include "target.h"
  29 #include "trad-frame.h"
  30
  31 #include "gdb_assert.h"
  32 #include "gdb_string.h"
  33
  34 #include "sparc64-tdep.h"
  35 #include "solib-svr4.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 \f
  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_collect_gregset (const struct regset *regset,
  62                              const struct regcache *regcache,
  63                              int regnum, void *gregs, size_t len)
  64 {
  65   sparc64_collect_gregset (&sparc64fbsd_gregset, regcache, regnum, gregs);
  66 }
  67
  68 static void
  69 sparc64fbsd_supply_fpregset (const struct regset *regset,
  70                              struct regcache *regcache,
  71                              int regnum, const void *fpregs, size_t len)
  72 {
  73   sparc64_supply_fpregset (regcache, regnum, fpregs);
  74 }
  75
  76 static void
  77 sparc64fbsd_collect_fpregset (const struct regset *regset,
  78                               const struct regcache *regcache,
  79                               int regnum, void *fpregs, size_t len)
  80 {
  81   sparc64_collect_fpregset (regcache, regnum, fpregs);
  82 }
  83 \f
  84
  85 /* Signal trampolines.  */
  86
  87 static int
  88 sparc64fbsd_pc_in_sigtramp (CORE_ADDR pc, char *name)
  89 {
  90   return (name && strcmp (name, "__sigtramp") == 0);
  91 }
  92
  93 static struct sparc_frame_cache *
  94 sparc64fbsd_sigtramp_frame_cache (struct frame_info *this_frame,
  95                                    void **this_cache)
  96 {
  97   struct sparc_frame_cache *cache;
  98   CORE_ADDR addr, mcontext_addr, sp;
  99   LONGEST fprs;
 100   int regnum;
 101
 102   if (*this_cache)
 103     return *this_cache;
 104
 105   cache = sparc_frame_cache (this_frame, this_cache);
 106   gdb_assert (cache == *this_cache);
 107
 108   cache->saved_regs = trad_frame_alloc_saved_regs (this_frame);
 109
 110   /* The third argument is a pointer to an instance of `ucontext_t',
 111      which has a member `uc_mcontext' that contains the saved
 112      registers.  */
 113   addr = get_frame_register_unsigned (this_frame, SPARC_O2_REGNUM);
 114   mcontext_addr = addr + 64;
 115
 116   /* The following registers travel in the `mc_local' slots of
 117      `mcontext_t'.  */
 118   addr = mcontext_addr + 16 * 8;
 119   cache->saved_regs[SPARC64_FPRS_REGNUM].addr = addr + 0 * 8;
 120   cache->saved_regs[SPARC64_FSR_REGNUM].addr = addr + 1 * 8;
 121
 122   /* The following registers travel in the `mc_in' slots of
 123      `mcontext_t'.  */
 124   addr = mcontext_addr + 24 * 8;
 125   cache->saved_regs[SPARC64_NPC_REGNUM].addr = addr + 0 * 8;
 126   cache->saved_regs[SPARC64_PC_REGNUM].addr = addr + 1 * 8;
 127   cache->saved_regs[SPARC64_STATE_REGNUM].addr = addr + 2 * 8;
 128   cache->saved_regs[SPARC64_Y_REGNUM].addr = addr + 4 * 8;
 129
 130   /* The `global' and `out' registers travel in the `mc_global' and
 131      `mc_out' slots of `mcontext_t', except for %g0.  Since %g0 is
 132      always zero, keep the identity encoding.  */
 133   for (regnum = SPARC_G1_REGNUM, addr = mcontext_addr + 8;
 134        regnum <= SPARC_O7_REGNUM; regnum++, addr += 8)
 135     cache->saved_regs[regnum].addr = addr;
 136
 137   /* The `local' and `in' registers have been saved in the register
 138      save area.  */
 139   addr = cache->saved_regs[SPARC_SP_REGNUM].addr;
 140   sp = get_frame_memory_unsigned (this_frame, addr, 8);
 141   for (regnum = SPARC_L0_REGNUM, addr = sp + BIAS;
 142        regnum <= SPARC_I7_REGNUM; regnum++, addr += 8)
 143     cache->saved_regs[regnum].addr = addr;
 144
 145   /* The floating-point registers are only saved if the FEF bit in
 146      %fprs has been set.  */
 147
 148 #define FPRS_FEF        (1 << 2)
 149
 150   addr = cache->saved_regs[SPARC64_FPRS_REGNUM].addr;
 151   fprs = get_frame_memory_unsigned (this_frame, addr, 8);
 152   if (fprs & FPRS_FEF)
 153     {
 154       for (regnum = SPARC_F0_REGNUM, addr = mcontext_addr + 32 * 8;
 155            regnum <= SPARC_F31_REGNUM; regnum++, addr += 4)
 156         cache->saved_regs[regnum].addr = addr;
 157
 158       for (regnum = SPARC64_F32_REGNUM;
 159            regnum <= SPARC64_F62_REGNUM; regnum++, addr += 8)
 160         cache->saved_regs[regnum].addr = addr;
 161     }
 162
 163   return cache;
 164 }
 165
 166 static void
 167 sparc64fbsd_sigtramp_frame_this_id (struct frame_info *this_frame,
 168                                     void **this_cache,
 169                                     struct frame_id *this_id)
 170 {
 171   struct sparc_frame_cache *cache =
 172     sparc64fbsd_sigtramp_frame_cache (this_frame, this_cache);
 173
 174   (*this_id) = frame_id_build (cache->base, cache->pc);
 175 }
 176
 177 static struct value *
 178 sparc64fbsd_sigtramp_frame_prev_register (struct frame_info *this_frame,
 179                                           void **this_cache, int regnum)
 180 {
 181   struct sparc_frame_cache *cache =
 182     sparc64fbsd_sigtramp_frame_cache (this_frame, this_cache);
 183
 184   return trad_frame_get_prev_register (this_frame, cache->saved_regs, regnum);
 185 }
 186
 187 static int
 188 sparc64fbsd_sigtramp_frame_sniffer (const struct frame_unwind *self,
 189                                     struct frame_info *this_frame,
 190                                     void **this_cache)
 191 {
 192   CORE_ADDR pc = get_frame_pc (this_frame);
 193   char *name;
 194
 195   find_pc_partial_function (pc, &name, NULL, NULL);
 196   if (sparc64fbsd_pc_in_sigtramp (pc, name))
 197     return 1;
 198
 199   return 0;
 200 }
 201
 202 static const struct frame_unwind sparc64fbsd_sigtramp_frame_unwind =
 203 {
 204   SIGTRAMP_FRAME,
 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 }