gnu/dist/gdb6/gdb/sparc64-sol2-tdep.c

   1 /* Target-dependent code for Solaris UltraSPARC.
   2
   3    Copyright (C) 2003, 2004, 2006 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., 51 Franklin Street, Fifth Floor,
  20    Boston, MA 02110-1301, USA.  */
  21
  22 #include "defs.h"
  23 #include "frame.h"
  24 #include "frame-unwind.h"
  25 #include "gdbarch.h"
  26 #include "symtab.h"
  27 #include "objfiles.h"
  28 #include "osabi.h"
  29 #include "trad-frame.h"
  30
  31 #include "gdb_assert.h"
  32
  33 #include "sol2-tdep.h"
  34 #include "sparc64-tdep.h"
  35 #include "solib-svr4.h"
  36
  37 /* From <sys/regset.h>.  */
  38 const struct sparc_gregset sparc64_sol2_gregset =
  39 {
  40   32 * 8,                       /* "tstate" */
  41   33 * 8,                       /* %pc */
  42   34 * 8,                       /* %npc */
  43   35 * 8,                       /* %y */
  44   -1,                           /* %wim */
  45   -1,                           /* %tbr */
  46   1 * 8,                        /* %g1 */
  47   16 * 8,                       /* %l0 */
  48   8                             /* sizeof (%y) */
  49 };
  50 \f
  51
  52 static struct sparc_frame_cache *
  53 sparc64_sol2_sigtramp_frame_cache (struct frame_info *next_frame,
  54                                    void **this_cache)
  55 {
  56   struct sparc_frame_cache *cache;
  57   CORE_ADDR mcontext_addr, addr;
  58   int regnum;
  59
  60   if (*this_cache)
  61     return *this_cache;
  62
  63   cache = sparc_frame_cache (next_frame, this_cache);
  64   gdb_assert (cache == *this_cache);
  65
  66   cache->saved_regs = trad_frame_alloc_saved_regs (next_frame);
  67
  68   /* The third argument is a pointer to an instance of `ucontext_t',
  69      which has a member `uc_mcontext' that contains the saved
  70      registers.  */
  71   regnum = (cache->frameless_p ? SPARC_O2_REGNUM : SPARC_I2_REGNUM);
  72   mcontext_addr = frame_unwind_register_unsigned (next_frame, regnum) + 64;
  73
  74   cache->saved_regs[SPARC64_CCR_REGNUM].addr = mcontext_addr + 0 * 8;
  75   cache->saved_regs[SPARC64_PC_REGNUM].addr = mcontext_addr + 1 * 8;
  76   cache->saved_regs[SPARC64_NPC_REGNUM].addr = mcontext_addr + 2 * 8;
  77   cache->saved_regs[SPARC64_Y_REGNUM].addr = mcontext_addr + 3 * 8;
  78   cache->saved_regs[SPARC64_ASI_REGNUM].addr = mcontext_addr + 19 * 8;
  79   cache->saved_regs[SPARC64_FPRS_REGNUM].addr = mcontext_addr + 20 * 8;
  80
  81   /* Since %g0 is always zero, keep the identity encoding.  */
  82   for (regnum = SPARC_G1_REGNUM, addr = mcontext_addr + 4 * 8;
  83        regnum <= SPARC_O7_REGNUM; regnum++, addr += 8)
  84     cache->saved_regs[regnum].addr = addr;
  85
  86   if (get_frame_memory_unsigned (next_frame, mcontext_addr + 21 * 8, 8))
  87     {
  88       /* The register windows haven't been flushed.  */
  89       for (regnum = SPARC_L0_REGNUM; regnum <= SPARC_I7_REGNUM; regnum++)
  90         trad_frame_set_unknown (cache->saved_regs, regnum);
  91     }
  92   else
  93     {
  94       CORE_ADDR sp;
  95
  96       addr = cache->saved_regs[SPARC_SP_REGNUM].addr;
  97       sp = get_frame_memory_unsigned (next_frame, addr, 8);
  98       for (regnum = SPARC_L0_REGNUM, addr = sp + BIAS;
  99            regnum <= SPARC_I7_REGNUM; regnum++, addr += 8)
 100         cache->saved_regs[regnum].addr = addr;
 101     }
 102
 103   return cache;
 104 }
 105
 106 static void
 107 sparc64_sol2_sigtramp_frame_this_id (struct frame_info *next_frame,
 108                                      void **this_cache,
 109                                      struct frame_id *this_id)
 110 {
 111   struct sparc_frame_cache *cache =
 112     sparc64_sol2_sigtramp_frame_cache (next_frame, this_cache);
 113
 114   (*this_id) = frame_id_build (cache->base, cache->pc);
 115 }
 116
 117 static void
 118 sparc64_sol2_sigtramp_frame_prev_register (struct frame_info *next_frame,
 119                                            void **this_cache,
 120                                            int regnum, int *optimizedp,
 121                                            enum lval_type *lvalp,
 122                                            CORE_ADDR *addrp,
 123                                            int *realnump, gdb_byte *valuep)
 124 {
 125   struct sparc_frame_cache *cache =
 126     sparc64_sol2_sigtramp_frame_cache (next_frame, this_cache);
 127
 128   trad_frame_get_prev_register (next_frame, cache->saved_regs, regnum,
 129                                 optimizedp, lvalp, addrp, realnump, valuep);
 130 }
 131
 132 static const struct frame_unwind sparc64_sol2_sigtramp_frame_unwind =
 133 {
 134   SIGTRAMP_FRAME,
 135   sparc64_sol2_sigtramp_frame_this_id,
 136   sparc64_sol2_sigtramp_frame_prev_register
 137 };
 138
 139 static const struct frame_unwind *
 140 sparc64_sol2_sigtramp_frame_sniffer (struct frame_info *next_frame)
 141 {
 142   CORE_ADDR pc = frame_pc_unwind (next_frame);
 143   char *name;
 144
 145   find_pc_partial_function (pc, &name, NULL, NULL);
 146   if (sparc_sol2_pc_in_sigtramp (pc, name))
 147     return &sparc64_sol2_sigtramp_frame_unwind;
 148
 149   return NULL;
 150 }
 151 \f
 152
 153 void
 154 sparc64_sol2_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 155 {
 156   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
 157
 158   frame_unwind_append_sniffer (gdbarch, sparc64_sol2_sigtramp_frame_sniffer);
 159
 160   sparc64_init_abi (info, gdbarch);
 161
 162   /* Solaris has SVR4-style shared libraries...  */
 163   set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target);
 164   set_gdbarch_skip_solib_resolver (gdbarch, sol2_skip_solib_resolver);
 165   set_solib_svr4_fetch_link_map_offsets
 166     (gdbarch, svr4_lp64_fetch_link_map_offsets);
 167
 168   /* ...which means that we need some special handling when doing
 169      prologue analysis.  */
 170   tdep->plt_entry_size = 16;
 171
 172   /* Solaris has kernel-assisted single-stepping support.  */
 173   set_gdbarch_software_single_step (gdbarch, NULL);
 174 }
 175 \f
 176
 177 /* Provide a prototype to silence -Wmissing-prototypes.  */
 178 void _initialize_sparc64_sol2_tdep (void);
 179
 180 void
 181 _initialize_sparc64_sol2_tdep (void)
 182 {
 183   gdbarch_register_osabi (bfd_arch_sparc, bfd_mach_sparc_v9,
 184                           GDB_OSABI_SOLARIS, sparc64_sol2_init_abi);
 185 }