gdb/sparc64-linux-tdep.c

   1 /* Target-dependent code for GNU/Linux UltraSPARC.
   2
   3    Copyright 2003, 2004, 2005 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 "osabi.h"
  27 #include "solib-svr4.h"
  28 #include "symtab.h"
  29 #include "trad-frame.h"
  30 #include "tramp-frame.h"
  31
  32 #include "sparc64-tdep.h"
  33
  34 /* Signal trampoline support.  */
  35
  36 static void sparc64_linux_sigframe_init (const struct tramp_frame *self,
  37                                          struct frame_info *next_frame,
  38                                          struct trad_frame_cache *this_cache,
  39                                          CORE_ADDR func);
  40
  41 /* See sparc-linux-tdep.c for details.  Note that 64-bit binaries only
  42    use RT signals.  */
  43
  44 static const struct tramp_frame sparc64_linux_rt_sigframe =
  45 {
  46   SIGTRAMP_FRAME,
  47   4,
  48   {
  49     { 0x82102065, -1 },         /* mov __NR_rt_sigreturn, %g1 */
  50     { 0x91d0206d, -1 },         /* ta  0x6d */
  51     { TRAMP_SENTINEL_INSN, -1 }
  52   },
  53   sparc64_linux_sigframe_init
  54 };
  55
  56 static void
  57 sparc64_linux_sigframe_init (const struct tramp_frame *self,
  58                              struct frame_info *next_frame,
  59                              struct trad_frame_cache *this_cache,
  60                              CORE_ADDR func)
  61 {
  62   CORE_ADDR base, addr;
  63   int regnum;
  64
  65   base = frame_unwind_register_unsigned (next_frame, SPARC_O1_REGNUM);
  66   base += 128;
  67
  68   /* Offsets from <bits/sigcontext.h>.  */
  69
  70   /* Since %g0 is always zero, keep the identity encoding.  */
  71   addr = base + 8;
  72   for (regnum = SPARC_G1_REGNUM; regnum <= SPARC_O7_REGNUM; regnum++)
  73     {
  74       trad_frame_set_reg_addr (this_cache, regnum, addr);
  75       addr += 8;
  76     }
  77
  78   trad_frame_set_reg_addr (this_cache, SPARC64_STATE_REGNUM, addr + 0);
  79   trad_frame_set_reg_addr (this_cache, SPARC64_PC_REGNUM, addr + 8);
  80   trad_frame_set_reg_addr (this_cache, SPARC64_NPC_REGNUM, addr + 16);
  81   trad_frame_set_reg_addr (this_cache, SPARC64_Y_REGNUM, addr + 24);
  82   trad_frame_set_reg_addr (this_cache, SPARC64_FPRS_REGNUM, addr + 28);
  83
  84   addr = frame_unwind_register_unsigned (next_frame, SPARC_SP_REGNUM);
  85   if (addr & 1)
  86     addr += BIAS;
  87
  88   base = addr;
  89   for (regnum = SPARC_L0_REGNUM; regnum <= SPARC_I7_REGNUM; regnum++)
  90     {
  91       trad_frame_set_reg_addr (this_cache, regnum, addr);
  92       addr += 8;
  93     }
  94   trad_frame_set_id (this_cache, frame_id_build (base, func));
  95 }
  96 \f
  97
  98 static void
  99 sparc64_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 100 {
 101   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
 102
 103   tramp_frame_prepend_unwinder (gdbarch, &sparc64_linux_rt_sigframe);
 104
 105   sparc64_init_abi (info, gdbarch);
 106
 107   /* GNU/Linux has SVR4-style shared libraries...  */
 108   set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target);
 109   set_solib_svr4_fetch_link_map_offsets
 110     (gdbarch, svr4_lp64_fetch_link_map_offsets);
 111
 112   /* ...which means that we need some special handling when doing
 113      prologue analysis.  */
 114   tdep->plt_entry_size = 16;
 115
 116   /* Enable TLS support.  */
 117   set_gdbarch_fetch_tls_load_module_address (gdbarch,
 118                                              svr4_fetch_objfile_link_map);
 119 }
 120 \f
 121
 122 /* Provide a prototype to silence -Wmissing-prototypes.  */
 123 extern void _initialize_sparc64_linux_tdep (void);
 124
 125 void
 126 _initialize_sparc64_linux_tdep (void)
 127 {
 128   gdbarch_register_osabi (bfd_arch_sparc, bfd_mach_sparc_v9,
 129                           GDB_OSABI_LINUX, sparc64_linux_init_abi);
 130 }