Line data    Source code

       1             : /* ppc ABI-specified defaults for DWARF CFI.
       2             :    Copyright (C) 2012, 2013 Red Hat, Inc.
       3             :    This file is part of elfutils.
       4             : 
       5             :    This file is free software; you can redistribute it and/or modify
       6             :    it under the terms of either
       7             : 
       8             :      * the GNU Lesser General Public License as published by the Free
       9             :        Software Foundation; either version 3 of the License, or (at
      10             :        your option) any later version
      11             : 
      12             :    or
      13             : 
      14             :      * the GNU General Public License as published by the Free
      15             :        Software Foundation; either version 2 of the License, or (at
      16             :        your option) any later version
      17             : 
      18             :    or both in parallel, as here.
      19             : 
      20             :    elfutils is distributed in the hope that it will be useful, but
      21             :    WITHOUT ANY WARRANTY; without even the implied warranty of
      22             :    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      23             :    General Public License for more details.
      24             : 
      25             :    You should have received copies of the GNU General Public License and
      26             :    the GNU Lesser General Public License along with this program.  If
      27             :    not, see <http://www.gnu.org/licenses/>.  */
      28             : 
      29             : #ifdef HAVE_CONFIG_H
      30             : # include <config.h>
      31             : #endif
      32             : 
      33             : #include <dwarf.h>
      34             : 
      35             : #define BACKEND ppc_
      36             : #include "libebl_CPU.h"
      37             : 
      38             : int
      39           8 : ppc_abi_cfi (Ebl *ebl __attribute__ ((unused)), Dwarf_CIE *abi_info)
      40             : {
      41           8 :   static const uint8_t abi_cfi[] =
      42             :     {
      43             :       /* This instruction is provided in every CIE.  It is not repeated here:
      44             :          DW_CFA_def_cfa, ULEB128_7 (1), ULEB128_7 (0)  */
      45             :       /* r1 is assumed to be restored from cfa adress,
      46             :          r1 acts as a stack frame pointer.  */
      47             :       DW_CFA_val_offset, ULEB128_7 (1), ULEB128_7 (0),
      48             :       /* lr is not callee-saved but it needs to be preserved as it is pre-set
      49             :          by the caller.  */
      50             :       DW_CFA_same_value, ULEB128_7 (65), /* lr */
      51             : 
      52             :       /* Callee-saved regs.  */
      53             : #define SV(n) DW_CFA_same_value, ULEB128_7 (n)
      54             :       SV (2),                   /* r2 is TOC pointer.  */
      55             :       SV (13),                  /* Reserved as system thread id (is it for CFI?).  */
      56             :       /* r14-r31 are non-volatile registers.  */
      57             :       SV (14), SV (15), SV (16), SV (17), SV (18), SV (19), SV (20), SV (21),
      58             :       SV (22), SV (23), SV (24), SV (25), SV (26), SV (27), SV (28), SV (29),
      59             :       SV (30), SV (31)
      60             :       /* VMX registers v20-v31 and vrsave are non-volatile but they are
      61             :          assigned DWARF registers 1144-1156 (v20-v31) which is outside of the
      62             :          CFI supported range.  */
      63             : #undef SV
      64             :     };
      65             : 
      66           8 :   abi_info->initial_instructions = abi_cfi;
      67           8 :   abi_info->initial_instructions_end = &abi_cfi[sizeof abi_cfi];
      68           8 :   abi_info->data_alignment_factor = ebl->class == ELFCLASS64 ? 8 : 4;
      69             : 
      70           8 :   abi_info->return_address_register = 65;
      71             : 
      72           8 :   return 0;
      73             : }
      74             : 
      75             : __typeof (ppc_abi_cfi)
      76             :      ppc64_abi_cfi
      77             :      __attribute__ ((alias ("ppc_abi_cfi")));