gdb/sparc64-sol2-tdep.c

   1 /* Target-dependent code for Solaris UltraSPARC.
   2
   3    Copyright (C) 2003, 2004, 2006, 2007, 2008, 2009, 2010, 2011
   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 =
  71     (cache->copied_regs_mask & 0x04) ? SPARC_I2_REGNUM : SPARC_O2_REGNUM;
  72   mcontext_addr = get_frame_register_unsigned (this_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 (this_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 (this_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 *this_frame,
 108                                      void **this_cache,
 109                                      struct frame_id *this_id)
 110 {
 111   struct sparc_frame_cache *cache =
 112     sparc64_sol2_sigtramp_frame_cache (this_frame, this_cache);
 113
 114   (*this_id) = frame_id_build (cache->base, cache->pc);
 115 }
 116
 117 static struct value *
 118 sparc64_sol2_sigtramp_frame_prev_register (struct frame_info *this_frame,
 119                                            void **this_cache,
 120                                            int regnum)
 121 {
 122   struct sparc_frame_cache *cache =
 123     sparc64_sol2_sigtramp_frame_cache (this_frame, this_cache);
 124
 125   return trad_frame_get_prev_register (this_frame, cache->saved_regs, regnum);
 126 }
 127
 128 static int
 129 sparc64_sol2_sigtramp_frame_sniffer (const struct frame_unwind *self,
 130                                      struct frame_info *this_frame,
 131                                      void **this_cache)
 132 {
 133   CORE_ADDR pc = get_frame_pc (this_frame);
 134   char *name;
 135
 136   find_pc_partial_function (pc, &name, NULL, NULL);
 137   if (sparc_sol2_pc_in_sigtramp (pc, name))
 138     return 1;
 139
 140   return 0;
 141 }
 142 static const struct frame_unwind sparc64_sol2_sigtramp_frame_unwind =
 143 {
 144   SIGTRAMP_FRAME,
 145   default_frame_unwind_stop_reason,
 146   sparc64_sol2_sigtramp_frame_this_id,
 147   sparc64_sol2_sigtramp_frame_prev_register,
 148   NULL,
 149   sparc64_sol2_sigtramp_frame_sniffer
 150 };
 151
 152 \f
 153
 154 void
 155 sparc64_sol2_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 156 {
 157   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
 158
 159   frame_unwind_append_unwinder (gdbarch, &sparc64_sol2_sigtramp_frame_unwind);
 160
 161   sparc64_init_abi (info, gdbarch);
 162
 163   /* The Sun compilers (Sun ONE Studio, Forte Developer, Sun WorkShop, SunPRO)
 164      compiler puts out 0 instead of the address in N_SO stabs.  Starting with
 165      SunPRO 3.0, the compiler does this for N_FUN stabs too.  */
 166   set_gdbarch_sofun_address_maybe_missing (gdbarch, 1);
 167
 168   /* The Sun compilers also do "globalization"; see the comment in
 169      sparc_sol2_static_transform_name for more information.  */
 170   set_gdbarch_static_transform_name
 171     (gdbarch, sparc_sol2_static_transform_name);
 172
 173   /* Solaris has SVR4-style shared libraries...  */
 174   set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target);
 175   set_gdbarch_skip_solib_resolver (gdbarch, sol2_skip_solib_resolver);
 176   set_solib_svr4_fetch_link_map_offsets
 177     (gdbarch, svr4_lp64_fetch_link_map_offsets);
 178
 179   /* ...which means that we need some special handling when doing
 180      prologue analysis.  */
 181   tdep->plt_entry_size = 16;
 182
 183   /* Solaris has kernel-assisted single-stepping support.  */
 184   set_gdbarch_software_single_step (gdbarch, NULL);
 185
 186   /* How to print LWP PTIDs from core files.  */
 187   set_gdbarch_core_pid_to_str (gdbarch, sol2_core_pid_to_str);
 188 }
 189 \f
 190
 191 /* Provide a prototype to silence -Wmissing-prototypes.  */
 192 void _initialize_sparc64_sol2_tdep (void);
 193
 194 void
 195 _initialize_sparc64_sol2_tdep (void)
 196 {
 197   gdbarch_register_osabi (bfd_arch_sparc, bfd_mach_sparc_v9,
 198                           GDB_OSABI_SOLARIS, sparc64_sol2_init_abi);
 199 }