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 "tramp-frame.h"
  26 #include "gdbarch.h"
  27 #include "osabi.h"
  28 #include "solib-svr4.h"
  29 #include "symtab.h"
  30 #include "trad-frame.h"
  31
  32 #include "sparc64-tdep.h"
  33
  34 /* The instruction sequence for RT signals is
  35        mov __NR_rt_sigreturn, %g1       ! hex: 0x82102065
  36        ta  0x6d                         ! hex: 0x91d0206d
  37
  38    The effect is to call the system call rt_sigreturn.
  39    Note that 64-bit binaries only use this RT signal return method.  */
  40
  41 #define LINUX64_RT_SIGTRAMP_INSN0       0x82102065
  42 #define LINUX64_RT_SIGTRAMP_INSN1       0x91d0206d
  43
  44
  45 static void sparc64_linux_sigframe_init (const struct tramp_frame *self,
  46                                          struct frame_info *next_frame,
  47                                          struct trad_frame_cache *this_cache,
  48                                          CORE_ADDR func);
  49
  50 static const struct tramp_frame sparc64_linux_rt_sigframe = {
  51   SIGTRAMP_FRAME,
  52   4,
  53   {
  54     { LINUX64_RT_SIGTRAMP_INSN0, -1 },
  55     { LINUX64_RT_SIGTRAMP_INSN1, -1 },
  56     { TRAMP_SENTINEL_INSN, -1 }
  57   },
  58   sparc64_linux_sigframe_init
  59 };
  60
  61 static void
  62 sparc64_linux_sigframe_init (const struct tramp_frame *self,
  63                              struct frame_info *next_frame,
  64                              struct trad_frame_cache *this_cache,
  65                              CORE_ADDR func)
  66 {
  67   CORE_ADDR base, addr;
  68   int regnum;
  69
  70   base = frame_unwind_register_unsigned (next_frame, SPARC_O1_REGNUM);
  71   base += 128;
  72
  73   /* Offsets from <bits/sigcontext.h> */
  74
  75   /* Since %g0 is always zero, keep the identity encoding.  */
  76   addr = base + 0x08;
  77   for (regnum = SPARC_G1_REGNUM; regnum <= SPARC_O7_REGNUM; regnum++)
  78     {
  79       trad_frame_set_reg_addr (this_cache, regnum, addr);
  80       addr += 8;
  81     }
  82
  83   trad_frame_set_reg_addr (this_cache, SPARC64_STATE_REGNUM, addr + 0x00);
  84   trad_frame_set_reg_addr (this_cache, SPARC64_PC_REGNUM,    addr + 0x08);
  85   trad_frame_set_reg_addr (this_cache, SPARC64_NPC_REGNUM,   addr + 0x10);
  86   trad_frame_set_reg_addr (this_cache, SPARC64_Y_REGNUM,     addr + 0x18);
  87   trad_frame_set_reg_addr (this_cache, SPARC64_FPRS_REGNUM,  addr + 0x1c);
  88
  89   addr = frame_unwind_register_unsigned (next_frame, SPARC_SP_REGNUM);
  90   if (addr & 1)
  91     addr += BIAS;
  92
  93   base = addr;
  94   for (regnum = SPARC_L0_REGNUM; regnum <= SPARC_I7_REGNUM; regnum++)
  95     {
  96       trad_frame_set_reg_addr (this_cache, regnum, addr);
  97       addr += 8;
  98     }
  99   trad_frame_set_id (this_cache, frame_id_build (base, func));
 100 }
 101 \f
 102 static void
 103 sparc64_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 104 {
 105   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
 106
 107   tramp_frame_prepend_unwinder (gdbarch, &sparc64_linux_rt_sigframe);
 108
 109   /* GNU/Linux has SVR4-style shared libraries...  */
 110   set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target);
 111   set_solib_svr4_fetch_link_map_offsets
 112     (gdbarch, svr4_lp64_fetch_link_map_offsets);
 113
 114   /* ...which means that we need some special handling when doing
 115      prologue analysis.  */
 116   tdep->plt_entry_size = 16;
 117
 118   /* Enable TLS support.  */
 119   set_gdbarch_fetch_tls_load_module_address (gdbarch,
 120                                              svr4_fetch_objfile_link_map);
 121 }
 122
 123 /* Provide a prototype to silence -Wmissing-prototypes.  */
 124 extern void _initialize_sparc64_linux_tdep (void);
 125
 126 void
 127 _initialize_sparc64_linux_tdep (void)
 128 {
 129   gdbarch_register_osabi (bfd_arch_sparc, bfd_mach_sparc_v9,
 130                           GDB_OSABI_LINUX, sparc64_linux_init_abi);
 131 }