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       1                 :            : /* LoongArch ABI-specified defaults for DWARF CFI.
       2                 :            :    Copyright (C) 2023 OpenAnolis community LoongArch SIG.
       3                 :            :    Copyright (C) 2023 Loongson Technology Corporation Limted.
       4                 :            :    This file is part of elfutils.
       5                 :            : 
       6                 :            :    This file is free software; you can redistribute it and/or modify
       7                 :            :    it under the terms of either
       8                 :            : 
       9                 :            :      * the GNU Lesser General Public License as published by the Free
      10                 :            :        Software Foundation; either version 3 of the License, or (at
      11                 :            :        your option) any later version
      12                 :            : 
      13                 :            :    or
      14                 :            : 
      15                 :            :      * the GNU General Public License as published by the Free
      16                 :            :        Software Foundation; either version 2 of the License, or (at
      17                 :            :        your option) any later version
      18                 :            : 
      19                 :            :    or both in parallel, as here.
      20                 :            : 
      21                 :            :    elfutils is distributed in the hope that it will be useful, but
      22                 :            :    WITHOUT ANY WARRANTY; without even the implied warranty of
      23                 :            :    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      24                 :            :    General Public License for more details.
      25                 :            : 
      26                 :            :    You should have received copies of the GNU General Public License and
      27                 :            :    the GNU Lesser General Public License along with this program.  If
      28                 :            :    not, see <http://www.gnu.org/licenses/>.  */
      29                 :            : 
      30                 :            : #ifdef HAVE_CONFIG_H
      31                 :            : # include <config.h>
      32                 :            : #endif
      33                 :            : 
      34                 :            : #include <dwarf.h>
      35                 :            : 
      36                 :            : #define BACKEND loongarch_
      37                 :            : #include "libebl_CPU.h"
      38                 :            : 
      39                 :            : /* LoongArch ELF ABI specification:
      40                 :            : https://loongson.github.io/LoongArch-Documentation/LoongArch-ELF-ABI-EN.html#_register_convention
      41                 :            : */
      42                 :            : int
      43                 :          0 : loongarch_abi_cfi (Ebl *ebl __attribute__ ((unused)), Dwarf_CIE *abi_info)
      44                 :            : {
      45                 :          0 :   static const uint8_t abi_cfi[] =
      46                 :            :     {
      47                 :            :       /* The initial Canonical Frame Address is the value of the
      48                 :            :          Stack Pointer ($r3) as setup in the previous frame. */
      49                 :            :       DW_CFA_def_cfa, ULEB128_7 (3), ULEB128_7 (0),
      50                 :            : 
      51                 :            :       /* The Stack Pointer ($r3) is restored from CFA address by default.  */
      52                 :            :       DW_CFA_val_offset, ULEB128_7 (3), ULEB128_7 (0),
      53                 :            : 
      54                 :            : #define SV(n) DW_CFA_same_value, ULEB128_7 (n)
      55                 :            :       /* The return address register contains the return address setup by
      56                 :            :          caller.  */
      57                 :            :       SV (1),
      58                 :            : 
      59                 :            :       /* Callee-saved registers $s0-$s7.  */
      60                 :            :       SV (23), SV (24), SV (25), SV (26), SV (27), SV (28),
      61                 :            :       SV (29), SV (30), SV (31),
      62                 :            : 
      63                 :            :       /* The Frame Pointer ($fp, $r22) */
      64                 :            :       SV(22),
      65                 :            : 
      66                 :            :       /* Callee-saved registers $fs0-$fs7.  */
      67                 :            :       SV (56), SV (57), SV (58), SV (59), SV (60), SV (61),
      68                 :            :       SV (62), SV (63),
      69                 :            : #undef SV
      70                 :            : 
      71                 :            :       /* XXX Note: registers intentionally unused by the program,
      72                 :            :          for example as a consequence of the procedure call standard
      73                 :            :          should be initialized as if by DW_CFA_same_value.  */
      74                 :            :     };
      75                 :            : 
      76                 :          0 :   abi_info->initial_instructions = abi_cfi;
      77                 :          0 :   abi_info->initial_instructions_end = &abi_cfi[sizeof abi_cfi];
      78                 :          0 :   abi_info->data_alignment_factor = -4;
      79                 :            : 
      80                 :          0 :   abi_info->return_address_register = 1; /* ra.  */
      81                 :            : 
      82                 :          0 :   return 0;
      83                 :            : }