Line data    Source code

       1              : /* arm64 ABI-specified defaults for DWARF CFI.
       2              :    Copyright (C) 2013, 2018 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 aarch64_
      36              : #include "libebl_CPU.h"
      37              : 
      38              : 
      39              : /* ABI-specified state of DWARF CFI based on:
      40              : 
      41              :    "DWARF for the ARM 64 bit architecture (AArch64) 1.0"
      42              : http://infocenter.arm.com/help/topic/com.arm.doc.ihi0057b/IHI0057B_aadwarf64.pdf
      43              : 
      44              :    "Procedure Call Standard for the ARM 64 bit Architecture 1.0"
      45              : http://infocenter.arm.com/help/topic/com.arm.doc.ihi0055b/IHI0055B_aapcs64.pdf
      46              : */
      47              : 
      48              : int
      49           24 : aarch64_abi_cfi (Ebl *ebl __attribute__ ((unused)), Dwarf_CIE *abi_info)
      50              : {
      51           24 :   static const uint8_t abi_cfi[] =
      52              :     {
      53              :       /* The initial Canonical Frame Address is the value of the
      54              :          Stack Pointer (r31) as setup in the previous frame. */
      55              :       DW_CFA_def_cfa, ULEB128_7 (30), ULEB128_7 (0),
      56              : 
      57              : #define SV(n) DW_CFA_same_value, ULEB128_7 (n)
      58              :       /* Callee-saved regs r19-r28.  */
      59              :       SV (19), SV (20), SV (21), SV (22), SV (23),
      60              :       SV (24), SV (25), SV (26), SV (27), SV (28),
      61              : 
      62              :       /* The Frame Pointer (FP, r29) and Link Register (LR, r30).  */
      63              :       SV (29), SV (30),
      64              : 
      65              :       /* The Stack Pointer (r31) is restored from CFA address by default.  */
      66              :       DW_CFA_val_offset, ULEB128_7 (31), ULEB128_7 (0),
      67              : 
      68              :       /* Callee-saved fpregs v8-v15.  v0 == 64.  */
      69              :       SV (72), SV (73), SV (74), SV (75),
      70              :       SV (76), SV (77), SV (78), SV (79),
      71              : #undef SV
      72              : 
      73              :       /* XXX Note: registers intentionally unused by the program,
      74              :          for example as a consequence of the procedure call standard
      75              :          should be initialized as if by DW_CFA_same_value.  */
      76              :     };
      77              : 
      78           24 :   abi_info->initial_instructions = abi_cfi;
      79           24 :   abi_info->initial_instructions_end = &abi_cfi[sizeof abi_cfi];
      80           24 :   abi_info->data_alignment_factor = -4;
      81              : 
      82           24 :   abi_info->return_address_register = 30; /* lr.  */
      83              : 
      84           24 :   return 0;
      85              : }