gdb/sparc64-sol2-tdep.c

   1 /* Target-dependent code for Solaris UltraSPARC.
   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 "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 "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 *next_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 (next_frame, this_cache);
  63   gdb_assert (cache == *this_cache);
  64
  65   cache->saved_regs = trad_frame_alloc_saved_regs (next_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 = frame_unwind_register_unsigned (next_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 (next_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 (next_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 *next_frame,
 107                                      void **this_cache,
 108                                      struct frame_id *this_id)
 109 {
 110   struct sparc_frame_cache *cache =
 111     sparc64_sol2_sigtramp_frame_cache (next_frame, this_cache);
 112
 113   (*this_id) = frame_id_build (cache->base, cache->pc);
 114 }
 115
 116 static void
 117 sparc64_sol2_sigtramp_frame_prev_register (struct frame_info *next_frame,
 118                                            void **this_cache,
 119                                            int regnum, int *optimizedp,
 120                                            enum lval_type *lvalp,
 121                                            CORE_ADDR *addrp,
 122                                            int *realnump, void *valuep)
 123 {
 124   struct sparc_frame_cache *cache =
 125     sparc64_sol2_sigtramp_frame_cache (next_frame, this_cache);
 126
 127   trad_frame_prev_register (next_frame, cache->saved_regs, regnum,
 128                             optimizedp, lvalp, addrp, realnump, valuep);
 129 }
 130
 131 static const struct frame_unwind sparc64_sol2_sigtramp_frame_unwind =
 132 {
 133   SIGTRAMP_FRAME,
 134   sparc64_sol2_sigtramp_frame_this_id,
 135   sparc64_sol2_sigtramp_frame_prev_register
 136 };
 137
 138 static const struct frame_unwind *
 139 sparc64_sol2_sigtramp_frame_sniffer (struct frame_info *next_frame)
 140 {
 141   CORE_ADDR pc = frame_pc_unwind (next_frame);
 142   char *name;
 143
 144   find_pc_partial_function (pc, &name, NULL, NULL);
 145   if (sparc_sol2_pc_in_sigtramp (pc, name))
 146     return &sparc64_sol2_sigtramp_frame_unwind;
 147
 148   return NULL;
 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_sniffer (gdbarch, sparc64_sol2_sigtramp_frame_sniffer);
 158
 159   sparc64_init_abi (info, gdbarch);
 160
 161   /* Solaris has SVR4-style shared libraries...  */
 162   set_gdbarch_in_solib_call_trampoline (gdbarch, in_plt_section);
 163   set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target);
 164   set_solib_svr4_fetch_link_map_offsets
 165     (gdbarch, svr4_lp64_fetch_link_map_offsets);
 166
 167   /* ...which means that we need some special handling when doing
 168      prologue analysis.  */
 169   tdep->plt_entry_size = 16;
 170
 171   /* Solaris has kernel-assisted single-stepping support.  */
 172   set_gdbarch_software_single_step (gdbarch, NULL);
 173 }
 174 \f
 175
 176 /* Provide a prototype to silence -Wmissing-prototypes.  */
 177 void _initialize_sparc64_sol2_tdep (void);
 178
 179 void
 180 _initialize_sparc64_sol2_tdep (void)
 181 {
 182   gdbarch_register_osabi (bfd_arch_sparc, bfd_mach_sparc_v9,
 183                           GDB_OSABI_SOLARIS, sparc64_sol2_init_abi);
 184 }