LCOV - code coverage report
Current view: top level - backends - loongarch_retval.c (source / functions) Hit Total Coverage
Test: elfutils-0.189 Lines: 0 56 0.0 %
Date: 2023-10-24 20:27:32 Functions: 0 2 0.0 %
Legend: Lines: hit not hit | Branches: + taken - not taken # not executed Branches: 0 46 0.0 %

           Branch data     Line data    Source code
       1                 :            : /* Function return value location for Linux/LoongArch ABI.
       2                 :            :    Copyright (C) 2013 Red Hat, Inc.
       3                 :            :    Copyright (C) 2023 OpenAnolis community LoongArch SIG.
       4                 :            :    Copyright (C) 2023 Loongson Technology Corporation Limited.
       5                 :            : 
       6                 :            :    This file is part of elfutils.
       7                 :            : 
       8                 :            :    This file is free software; you can redistribute it and/or modify
       9                 :            :    it under the terms of either
      10                 :            : 
      11                 :            :      * the GNU Lesser General Public License as published by the Free
      12                 :            :        Software Foundation; either version 3 of the License, or (at
      13                 :            :        your option) any later version
      14                 :            : 
      15                 :            :    or
      16                 :            : 
      17                 :            :      * the GNU General Public License as published by the Free
      18                 :            :        Software Foundation; either version 2 of the License, or (at
      19                 :            :        your option) any later version
      20                 :            : 
      21                 :            :    or both in parallel, as here.
      22                 :            : 
      23                 :            :    elfutils is distributed in the hope that it will be useful, but
      24                 :            :    WITHOUT ANY WARRANTY; without even the implied warranty of
      25                 :            :    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      26                 :            :    General Public License for more details.
      27                 :            : 
      28                 :            :    You should have received copies of the GNU General Public License and
      29                 :            :    the GNU Lesser General Public License along with this program.  If
      30                 :            :    not, see <http://www.gnu.org/licenses/>.  */
      31                 :            : 
      32                 :            : #ifdef HAVE_CONFIG_H
      33                 :            : # include <config.h>
      34                 :            : #endif
      35                 :            : 
      36                 :            : #include <stdio.h>
      37                 :            : #include <inttypes.h>
      38                 :            : 
      39                 :            : #include <assert.h>
      40                 :            : #include <dwarf.h>
      41                 :            : 
      42                 :            : #define BACKEND loongarch_
      43                 :            : #include "libebl_CPU.h"
      44                 :            : 
      45                 :            : static int
      46                 :          0 : dwarf_bytesize_aux (Dwarf_Die *die, Dwarf_Word *sizep)
      47                 :            : {
      48                 :          0 :   int bits;
      49         [ #  # ]:          0 :   if (((bits = 8 * dwarf_bytesize (die)) < 0
      50         [ #  # ]:          0 :        && (bits = dwarf_bitsize (die)) < 0)
      51         [ #  # ]:          0 :       || bits % 8 != 0)
      52                 :          0 :     return -1;
      53                 :            : 
      54                 :          0 :   *sizep = bits / 8;
      55                 :          0 :   return 0;
      56                 :            : }
      57                 :            : 
      58                 :            : static int
      59                 :          0 : pass_in_gpr (const Dwarf_Op **locp, Dwarf_Word size)
      60                 :            : {
      61                 :          0 :   static const Dwarf_Op loc[] =
      62                 :            :     {
      63                 :            :       { .atom = DW_OP_reg4 }, { .atom = DW_OP_piece, .number = 8 },
      64                 :            :       { .atom = DW_OP_reg5 }, { .atom = DW_OP_piece, .number = 8 }
      65                 :            :     };
      66                 :            : 
      67                 :          0 :   *locp = loc;
      68                 :          0 :   return size <= 8 ? 1 : 4;
      69                 :            : }
      70                 :            : 
      71                 :            : static int
      72                 :          0 : pass_by_ref (const Dwarf_Op **locp)
      73                 :            : {
      74                 :          0 :   static const Dwarf_Op loc[] = { { .atom = DW_OP_breg4 } };
      75                 :            : 
      76                 :          0 :   *locp = loc;
      77                 :          0 :   return 1;
      78                 :            : }
      79                 :            : 
      80                 :            : static int
      81                 :          0 : pass_in_fpr (const Dwarf_Op **locp, Dwarf_Word size)
      82                 :            : {
      83                 :          0 :   static const Dwarf_Op loc[] =
      84                 :            :     {
      85                 :            :       { .atom = DW_OP_regx, .number = 32 },
      86                 :            :       { .atom = DW_OP_piece, .number = 8 },
      87                 :            :       { .atom = DW_OP_regx, .number = 33 },
      88                 :            :       { .atom = DW_OP_piece, .number = 8 }
      89                 :            :     };
      90                 :            : 
      91                 :          0 :   *locp = loc;
      92                 :          0 :   return size <= 8 ? 1 : 4;
      93                 :            : }
      94                 :            : 
      95                 :            : int
      96                 :          0 : loongarch_return_value_location(Dwarf_Die *functypedie,
      97                 :            :                                 const Dwarf_Op **locp)
      98                 :            : {
      99                 :            :   /* Start with the function's type, and get the DW_AT_type attribute,
     100                 :            :      which is the type of the return value.  */
     101                 :          0 :   Dwarf_Die typedie;
     102                 :          0 :   int tag = dwarf_peeled_die_type (functypedie, &typedie);
     103         [ #  # ]:          0 :   if (tag <= 0)
     104                 :            :     return tag;
     105                 :            : 
     106                 :          0 :   Dwarf_Word size = (Dwarf_Word)-1;
     107                 :            : 
     108                 :            :   /* If the argument type is a Composite Type that is larger than 16
     109                 :            :      bytes, then the argument is copied to memory allocated by the
     110                 :            :      caller and the argument is replaced by a pointer to the copy.  */
     111         [ #  # ]:          0 :   if (tag == DW_TAG_structure_type || tag == DW_TAG_union_type
     112         [ #  # ]:          0 :       || tag == DW_TAG_class_type || tag == DW_TAG_array_type)
     113                 :            :     {
     114         [ #  # ]:          0 :       if (dwarf_aggregate_size (&typedie, &size) < 0)
     115                 :            :         return -1;
     116                 :            : 
     117                 :            :       /* Aggregates larger than 2*GRLEN bits are passed by reference.  */
     118         [ #  # ]:          0 :       if (size > 16)
     119                 :          0 :         return pass_by_ref (locp);
     120                 :            :       /* Aggregates whose total size is no more than GRLEN bits are passed in
     121                 :            :          a register.  Aggregates whose total size is no more than 2*GRLEN bits
     122                 :            :          are passed in a pair of registers.  */
     123                 :            :       else
     124         [ #  # ]:          0 :         return pass_in_gpr (locp, size);
     125                 :            :     }
     126                 :            : 
     127   [ #  #  #  # ]:          0 :   if (tag == DW_TAG_base_type || dwarf_is_pointer (tag))
     128                 :            :     {
     129         [ #  # ]:          0 :       if (dwarf_bytesize_aux (&typedie, &size) < 0)
     130                 :            :         {
     131         [ #  # ]:          0 :           if (dwarf_is_pointer (tag))
     132                 :          0 :             size = 8;
     133                 :            :           else
     134                 :            :             return -1;
     135                 :            :         }
     136                 :            : 
     137                 :          0 :       Dwarf_Attribute attr_mem;
     138         [ #  # ]:          0 :       if (tag == DW_TAG_base_type)
     139                 :            :         {
     140                 :          0 :           Dwarf_Word encoding;
     141         [ #  # ]:          0 :           if (dwarf_formudata (dwarf_attr_integrate (&typedie, DW_AT_encoding,
     142                 :            :                                                      &attr_mem),
     143                 :            :                                &encoding) != 0)
     144                 :            :             return -1;
     145                 :            : 
     146   [ #  #  #  # ]:          0 :           switch (encoding)
     147                 :            :             {
     148                 :          0 :             case DW_ATE_boolean:
     149                 :            :             case DW_ATE_signed:
     150                 :            :             case DW_ATE_unsigned:
     151                 :            :             case DW_ATE_unsigned_char:
     152                 :            :             case DW_ATE_signed_char:
     153                 :            :               /* Scalars that are at most GRLEN bits wide are passed in a single
     154                 :            :                  argument register.  Scalars that are 2*GRLEN bits wide are
     155                 :            :                  passed in a pair of argument registers.  Scalars wider than
     156                 :            :                  2*GRLEN are passed by reference.  */
     157         [ #  # ]:          0 :               return pass_in_gpr (locp, size);
     158                 :            : 
     159                 :          0 :             case DW_ATE_float:
     160                 :            :               /* A real floating-point argument is passed in a floating-point
     161                 :            :                  argument register if it is no more than FLEN bits wide,
     162                 :            :                  otherwise it is passed according to the integer calling
     163                 :            :                  convention.  */
     164      [ #  #  # ]:          0 :               switch (size)
     165                 :            :                 {
     166                 :          0 :                 case 4: /* single */
     167                 :            :                 case 8: /* double */
     168                 :          0 :                   return pass_in_fpr (locp, size);
     169                 :            : 
     170                 :          0 :                 case 16: /* quad */
     171                 :          0 :                   return pass_in_gpr (locp, size);
     172                 :            : 
     173                 :            :                 default:
     174                 :            :                   return -2;
     175                 :            :                 }
     176                 :            : 
     177                 :          0 :             case DW_ATE_complex_float:
     178                 :            :               /* A complex floating-point number is passed as though it were a
     179                 :            :                  struct containing two floating-point reals.  */
     180      [ #  #  # ]:          0 :               switch (size)
     181                 :            :                 {
     182                 :          0 :                 case 8: /* float _Complex */
     183                 :            :                 case 16: /* double _Complex */
     184         [ #  # ]:          0 :                   return pass_in_fpr (locp, size);
     185                 :            : 
     186                 :            :                 case 32: /* long double _Complex */
     187                 :          0 :                   return pass_by_ref (locp);
     188                 :            : 
     189                 :            :                 default:
     190                 :            :                   return -2;
     191                 :            :                 }
     192                 :            :             }
     193                 :            : 
     194                 :            :           return -2;
     195                 :            :         }
     196                 :            :       else
     197         [ #  # ]:          0 :         return pass_in_gpr (locp, size);
     198                 :            :     }
     199                 :            : 
     200                 :          0 :   *locp = NULL;
     201                 :          0 :   return 0;
     202                 :            : }

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