gdb/sparc64fbsd-tdep.c

   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 \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 (regset->descr, 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 \f
  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_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 \f
 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 = XMALLOC (struct regset);
 203   tdep->gregset->descr = &sparc64fbsd_gregset;
 204   tdep->gregset->supply_regset = sparc64fbsd_supply_gregset;
 205   tdep->sizeof_gregset = 256;
 206
 207   tdep->fpregset = XMALLOC (struct regset);
 208   tdep->fpregset->supply_regset = sparc64fbsd_supply_fpregset;
 209   tdep->sizeof_fpregset = 272;
 210
 211   set_gdbarch_pc_in_sigtramp (gdbarch, sparc64fbsd_pc_in_sigtramp);
 212   frame_unwind_append_sniffer (gdbarch, sparc64fbsd_sigtramp_frame_sniffer);
 213
 214   sparc64_init_abi (info, gdbarch);
 215 }
 216
 217 /* Provide a prototype to silence -Wmissing-prototypes.  */
 218 void _initialize_sparc64fbsd_tdep (void);
 219
 220 void
 221 _initialize_sparc64fbsd_tdep (void)
 222 {
 223   gdbarch_register_osabi (bfd_arch_sparc, bfd_mach_sparc_v9,
 224                           GDB_OSABI_FREEBSD_ELF, sparc64fbsd_init_abi);
 225 }