gdb/sparc64-sol2-tdep.c

   1 /* Target-dependent code for Solaris UltraSPARC.
   2
   3    Copyright (C) 2003, 2004, 2006, 2007, 2008 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 "gdbarch.h"
  24 #include "symtab.h"
  25 #include "objfiles.h"
  26 #include "osabi.h"
  27 #include "trad-frame.h"
  28
  29 #include "gdb_assert.h"
  30
  31 #include "sol2-tdep.h"
  32 #include "sparc64-tdep.h"
  33 #include "solib-svr4.h"
  34
  35 /* From <sys/regset.h>.  */
  36 const struct sparc_gregset sparc64_sol2_gregset =
  37 {
  38   32 * 8,                       /* "tstate" */
  39   33 * 8,                       /* %pc */
  40   34 * 8,                       /* %npc */
  41   35 * 8,                       /* %y */
  42   -1,                           /* %wim */
  43   -1,                           /* %tbr */
  44   1 * 8,                        /* %g1 */
  45   16 * 8,                       /* %l0 */
  46   8                             /* sizeof (%y) */
  47 };
  48 \f
  49
  50 static struct sparc_frame_cache *
  51 sparc64_sol2_sigtramp_frame_cache (struct frame_info *this_frame,
  52                                    void **this_cache)
  53 {
  54   struct sparc_frame_cache *cache;
  55   CORE_ADDR mcontext_addr, addr;
  56   int regnum;
  57
  58   if (*this_cache)
  59     return *this_cache;
  60
  61   cache = sparc_frame_cache (this_frame, this_cache);
  62   gdb_assert (cache == *this_cache);
  63
  64   cache->saved_regs = trad_frame_alloc_saved_regs (this_frame);
  65
  66   /* The third argument is a pointer to an instance of `ucontext_t',
  67      which has a member `uc_mcontext' that contains the saved
  68      registers.  */
  69   regnum = (cache->frameless_p ? SPARC_O2_REGNUM : SPARC_I2_REGNUM);
  70   mcontext_addr = get_frame_register_unsigned (this_frame, regnum) + 64;
  71
  72   cache->saved_regs[SPARC64_CCR_REGNUM].addr = mcontext_addr + 0 * 8;
  73   cache->saved_regs[SPARC64_PC_REGNUM].addr = mcontext_addr + 1 * 8;
  74   cache->saved_regs[SPARC64_NPC_REGNUM].addr = mcontext_addr + 2 * 8;
  75   cache->saved_regs[SPARC64_Y_REGNUM].addr = mcontext_addr + 3 * 8;
  76   cache->saved_regs[SPARC64_ASI_REGNUM].addr = mcontext_addr + 19 * 8;
  77   cache->saved_regs[SPARC64_FPRS_REGNUM].addr = mcontext_addr + 20 * 8;
  78
  79   /* Since %g0 is always zero, keep the identity encoding.  */
  80   for (regnum = SPARC_G1_REGNUM, addr = mcontext_addr + 4 * 8;
  81        regnum <= SPARC_O7_REGNUM; regnum++, addr += 8)
  82     cache->saved_regs[regnum].addr = addr;
  83
  84   if (get_frame_memory_unsigned (this_frame, mcontext_addr + 21 * 8, 8))
  85     {
  86       /* The register windows haven't been flushed.  */
  87       for (regnum = SPARC_L0_REGNUM; regnum <= SPARC_I7_REGNUM; regnum++)
  88         trad_frame_set_unknown (cache->saved_regs, regnum);
  89     }
  90   else
  91     {
  92       CORE_ADDR sp;
  93
  94       addr = cache->saved_regs[SPARC_SP_REGNUM].addr;
  95       sp = get_frame_memory_unsigned (this_frame, addr, 8);
  96       for (regnum = SPARC_L0_REGNUM, addr = sp + BIAS;
  97            regnum <= SPARC_I7_REGNUM; regnum++, addr += 8)
  98         cache->saved_regs[regnum].addr = addr;
  99     }
 100
 101   return cache;
 102 }
 103
 104 static void
 105 sparc64_sol2_sigtramp_frame_this_id (struct frame_info *this_frame,
 106                                      void **this_cache,
 107                                      struct frame_id *this_id)
 108 {
 109   struct sparc_frame_cache *cache =
 110     sparc64_sol2_sigtramp_frame_cache (this_frame, this_cache);
 111
 112   (*this_id) = frame_id_build (cache->base, cache->pc);
 113 }
 114
 115 static struct value *
 116 sparc64_sol2_sigtramp_frame_prev_register (struct frame_info *this_frame,
 117                                            void **this_cache,
 118                                            int regnum)
 119 {
 120   struct sparc_frame_cache *cache =
 121     sparc64_sol2_sigtramp_frame_cache (this_frame, this_cache);
 122
 123   return trad_frame_get_prev_register (this_frame, cache->saved_regs, regnum);
 124 }
 125
 126 static int
 127 sparc64_sol2_sigtramp_frame_sniffer (const struct frame_unwind *self,
 128                                      struct frame_info *this_frame,
 129                                      void **this_cache)
 130 {
 131   CORE_ADDR pc = get_frame_pc (this_frame);
 132   char *name;
 133
 134   find_pc_partial_function (pc, &name, NULL, NULL);
 135   if (sparc_sol2_pc_in_sigtramp (pc, name))
 136     return 1;
 137
 138   return 0;
 139 }
 140 static const struct frame_unwind sparc64_sol2_sigtramp_frame_unwind =
 141 {
 142   SIGTRAMP_FRAME,
 143   sparc64_sol2_sigtramp_frame_this_id,
 144   sparc64_sol2_sigtramp_frame_prev_register,
 145   NULL,
 146   sparc64_sol2_sigtramp_frame_sniffer
 147 };
 148
 149 \f
 150
 151 void
 152 sparc64_sol2_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 153 {
 154   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
 155
 156   frame_unwind_append_unwinder (gdbarch, &sparc64_sol2_sigtramp_frame_unwind);
 157
 158   sparc64_init_abi (info, gdbarch);
 159
 160   /* The Sun compilers (Sun ONE Studio, Forte Developer, Sun WorkShop, SunPRO)
 161      compiler puts out 0 instead of the address in N_SO stabs.  Starting with
 162      SunPRO 3.0, the compiler does this for N_FUN stabs too.  */
 163   set_gdbarch_sofun_address_maybe_missing (gdbarch, 1);
 164
 165   /* The Sun compilers also do "globalization"; see the comment in
 166      sparc_sol2_static_transform_name for more information.  */
 167   set_gdbarch_static_transform_name
 168     (gdbarch, sparc_sol2_static_transform_name);
 169
 170   /* Solaris has SVR4-style shared libraries...  */
 171   set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target);
 172   set_gdbarch_skip_solib_resolver (gdbarch, sol2_skip_solib_resolver);
 173   set_solib_svr4_fetch_link_map_offsets
 174     (gdbarch, svr4_lp64_fetch_link_map_offsets);
 175
 176   /* ...which means that we need some special handling when doing
 177      prologue analysis.  */
 178   tdep->plt_entry_size = 16;
 179
 180   /* Solaris has kernel-assisted single-stepping support.  */
 181   set_gdbarch_software_single_step (gdbarch, NULL);
 182 }
 183 \f
 184
 185 /* Provide a prototype to silence -Wmissing-prototypes.  */
 186 void _initialize_sparc64_sol2_tdep (void);
 187
 188 void
 189 _initialize_sparc64_sol2_tdep (void)
 190 {
 191   gdbarch_register_osabi (bfd_arch_sparc, bfd_mach_sparc_v9,
 192                           GDB_OSABI_SOLARIS, sparc64_sol2_init_abi);
 193 }