gdb/sparc64-sol2-tdep.c

   1 /* Target-dependent code for Solaris UltraSPARC.
   2
   3    Copyright (C) 2003, 2004, 2006, 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 "gdbarch.h"
  25 #include "symtab.h"
  26 #include "objfiles.h"
  27 #include "osabi.h"
  28 #include "trad-frame.h"
  29
  30 #include "gdb_assert.h"
  31
  32 #include "sol2-tdep.h"
  33 #include "sparc64-tdep.h"
  34 #include "solib-svr4.h"
  35
  36 /* From <sys/regset.h>.  */
  37 const struct sparc_gregset sparc64_sol2_gregset =
  38 {
  39   32 * 8,                       /* "tstate" */
  40   33 * 8,                       /* %pc */
  41   34 * 8,                       /* %npc */
  42   35 * 8,                       /* %y */
  43   -1,                           /* %wim */
  44   -1,                           /* %tbr */
  45   1 * 8,                        /* %g1 */
  46   16 * 8,                       /* %l0 */
  47   8                             /* sizeof (%y) */
  48 };
  49 \f
  50
  51 static struct sparc_frame_cache *
  52 sparc64_sol2_sigtramp_frame_cache (struct frame_info *this_frame,
  53                                    void **this_cache)
  54 {
  55   struct sparc_frame_cache *cache;
  56   CORE_ADDR mcontext_addr, addr;
  57   int regnum;
  58
  59   if (*this_cache)
  60     return *this_cache;
  61
  62   cache = sparc_frame_cache (this_frame, this_cache);
  63   gdb_assert (cache == *this_cache);
  64
  65   cache->saved_regs = trad_frame_alloc_saved_regs (this_frame);
  66
  67   /* The third argument is a pointer to an instance of `ucontext_t',
  68      which has a member `uc_mcontext' that contains the saved
  69      registers.  */
  70   regnum = (cache->frameless_p ? SPARC_O2_REGNUM : SPARC_I2_REGNUM);
  71   mcontext_addr = get_frame_register_unsigned (this_frame, regnum) + 64;
  72
  73   cache->saved_regs[SPARC64_CCR_REGNUM].addr = mcontext_addr + 0 * 8;
  74   cache->saved_regs[SPARC64_PC_REGNUM].addr = mcontext_addr + 1 * 8;
  75   cache->saved_regs[SPARC64_NPC_REGNUM].addr = mcontext_addr + 2 * 8;
  76   cache->saved_regs[SPARC64_Y_REGNUM].addr = mcontext_addr + 3 * 8;
  77   cache->saved_regs[SPARC64_ASI_REGNUM].addr = mcontext_addr + 19 * 8;
  78   cache->saved_regs[SPARC64_FPRS_REGNUM].addr = mcontext_addr + 20 * 8;
  79
  80   /* Since %g0 is always zero, keep the identity encoding.  */
  81   for (regnum = SPARC_G1_REGNUM, addr = mcontext_addr + 4 * 8;
  82        regnum <= SPARC_O7_REGNUM; regnum++, addr += 8)
  83     cache->saved_regs[regnum].addr = addr;
  84
  85   if (get_frame_memory_unsigned (this_frame, mcontext_addr + 21 * 8, 8))
  86     {
  87       /* The register windows haven't been flushed.  */
  88       for (regnum = SPARC_L0_REGNUM; regnum <= SPARC_I7_REGNUM; regnum++)
  89         trad_frame_set_unknown (cache->saved_regs, regnum);
  90     }
  91   else
  92     {
  93       CORE_ADDR sp;
  94
  95       addr = cache->saved_regs[SPARC_SP_REGNUM].addr;
  96       sp = get_frame_memory_unsigned (this_frame, addr, 8);
  97       for (regnum = SPARC_L0_REGNUM, addr = sp + BIAS;
  98            regnum <= SPARC_I7_REGNUM; regnum++, addr += 8)
  99         cache->saved_regs[regnum].addr = addr;
 100     }
 101
 102   return cache;
 103 }
 104
 105 static void
 106 sparc64_sol2_sigtramp_frame_this_id (struct frame_info *this_frame,
 107                                      void **this_cache,
 108                                      struct frame_id *this_id)
 109 {
 110   struct sparc_frame_cache *cache =
 111     sparc64_sol2_sigtramp_frame_cache (this_frame, this_cache);
 112
 113   (*this_id) = frame_id_build (cache->base, cache->pc);
 114 }
 115
 116 static struct value *
 117 sparc64_sol2_sigtramp_frame_prev_register (struct frame_info *this_frame,
 118                                            void **this_cache,
 119                                            int regnum)
 120 {
 121   struct sparc_frame_cache *cache =
 122     sparc64_sol2_sigtramp_frame_cache (this_frame, this_cache);
 123
 124   return trad_frame_get_prev_register (this_frame, cache->saved_regs, regnum);
 125 }
 126
 127 static int
 128 sparc64_sol2_sigtramp_frame_sniffer (const struct frame_unwind *self,
 129                                      struct frame_info *this_frame,
 130                                      void **this_cache)
 131 {
 132   CORE_ADDR pc = get_frame_pc (this_frame);
 133   char *name;
 134
 135   find_pc_partial_function (pc, &name, NULL, NULL);
 136   if (sparc_sol2_pc_in_sigtramp (pc, name))
 137     return 1;
 138
 139   return 0;
 140 }
 141 static const struct frame_unwind sparc64_sol2_sigtramp_frame_unwind =
 142 {
 143   SIGTRAMP_FRAME,
 144   sparc64_sol2_sigtramp_frame_this_id,
 145   sparc64_sol2_sigtramp_frame_prev_register,
 146   NULL,
 147   sparc64_sol2_sigtramp_frame_sniffer
 148 };
 149
 150 \f
 151
 152 void
 153 sparc64_sol2_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 154 {
 155   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
 156
 157   frame_unwind_append_unwinder (gdbarch, &sparc64_sol2_sigtramp_frame_unwind);
 158
 159   sparc64_init_abi (info, gdbarch);
 160
 161   /* The Sun compilers (Sun ONE Studio, Forte Developer, Sun WorkShop, SunPRO)
 162      compiler puts out 0 instead of the address in N_SO stabs.  Starting with
 163      SunPRO 3.0, the compiler does this for N_FUN stabs too.  */
 164   set_gdbarch_sofun_address_maybe_missing (gdbarch, 1);
 165
 166   /* The Sun compilers also do "globalization"; see the comment in
 167      sparc_sol2_static_transform_name for more information.  */
 168   set_gdbarch_static_transform_name
 169     (gdbarch, sparc_sol2_static_transform_name);
 170
 171   /* Solaris has SVR4-style shared libraries...  */
 172   set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target);
 173   set_gdbarch_skip_solib_resolver (gdbarch, sol2_skip_solib_resolver);
 174   set_solib_svr4_fetch_link_map_offsets
 175     (gdbarch, svr4_lp64_fetch_link_map_offsets);
 176
 177   /* ...which means that we need some special handling when doing
 178      prologue analysis.  */
 179   tdep->plt_entry_size = 16;
 180
 181   /* Solaris has kernel-assisted single-stepping support.  */
 182   set_gdbarch_software_single_step (gdbarch, NULL);
 183 }
 184 \f
 185
 186 /* Provide a prototype to silence -Wmissing-prototypes.  */
 187 void _initialize_sparc64_sol2_tdep (void);
 188
 189 void
 190 _initialize_sparc64_sol2_tdep (void)
 191 {
 192   gdbarch_register_osabi (bfd_arch_sparc, bfd_mach_sparc_v9,
 193                           GDB_OSABI_SOLARIS, sparc64_sol2_init_abi);
 194 }