LCOV - code coverage report
Current view: top level - backends - m68k_retval.c (source / functions) Coverage Total Hit
Test: elfutils-0.192 Lines: 0.0 % 36 0
Test Date: 2024-10-18 15:14:37 Functions: 0.0 % 1 0
Legend: Lines: hit not hit | Branches: + taken - not taken # not executed Branches: 0.0 % 29 0

             Branch data     Line data    Source code
       1                 :             : /* Function return value location for Linux/m68k ABI.
       2                 :             :    This file is part of elfutils.
       3                 :             : 
       4                 :             :    This file is free software; you can redistribute it and/or modify
       5                 :             :    it under the terms of either
       6                 :             : 
       7                 :             :      * the GNU Lesser General Public License as published by the Free
       8                 :             :        Software Foundation; either version 3 of the License, or (at
       9                 :             :        your option) any later version
      10                 :             : 
      11                 :             :    or
      12                 :             : 
      13                 :             :      * the GNU General Public License as published by the Free
      14                 :             :        Software Foundation; either version 2 of the License, or (at
      15                 :             :        your option) any later version
      16                 :             : 
      17                 :             :    or both in parallel, as here.
      18                 :             : 
      19                 :             :    elfutils is distributed in the hope that it will be useful, but
      20                 :             :    WITHOUT ANY WARRANTY; without even the implied warranty of
      21                 :             :    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      22                 :             :    General Public License for more details.
      23                 :             : 
      24                 :             :    You should have received copies of the GNU General Public License and
      25                 :             :    the GNU Lesser General Public License along with this program.  If
      26                 :             :    not, see <http://www.gnu.org/licenses/>.  */
      27                 :             : 
      28                 :             : 
      29                 :             : #ifdef HAVE_CONFIG_H
      30                 :             : # include <config.h>
      31                 :             : #endif
      32                 :             : 
      33                 :             : #include <assert.h>
      34                 :             : #include <dwarf.h>
      35                 :             : 
      36                 :             : #define BACKEND m68k_
      37                 :             : #include "libebl_CPU.h"
      38                 :             : 
      39                 :             : 
      40                 :             : /* %d0, or pair %d0, %d1.  */
      41                 :             : static const Dwarf_Op loc_intreg[] =
      42                 :             :   {
      43                 :             :     { .atom = DW_OP_reg0 }, { .atom = DW_OP_piece, .number = 4 },
      44                 :             :     { .atom = DW_OP_reg1 }, { .atom = DW_OP_piece, .number = 4 },
      45                 :             :   };
      46                 :             : #define nloc_intreg     1
      47                 :             : #define nloc_intregpair 4
      48                 :             : 
      49                 :             : /* %a0.  */
      50                 :             : static const Dwarf_Op loc_ptrreg[] =
      51                 :             :   {
      52                 :             :     { .atom = DW_OP_reg8 }
      53                 :             :   };
      54                 :             : #define nloc_ptrreg     1
      55                 :             : 
      56                 :             : /* %fp0.  */
      57                 :             : static const Dwarf_Op loc_fpreg[] =
      58                 :             :   {
      59                 :             :     { .atom = DW_OP_reg16 }
      60                 :             :   };
      61                 :             : #define nloc_fpreg      1
      62                 :             : 
      63                 :             : /* The return value is a structure and is actually stored in stack space
      64                 :             :    passed in a hidden argument by the caller.  But, the compiler
      65                 :             :    helpfully returns the address of that space in %a0.  */
      66                 :             : static const Dwarf_Op loc_aggregate[] =
      67                 :             :   {
      68                 :             :     { .atom = DW_OP_reg8 }
      69                 :             :   };
      70                 :             : #define nloc_aggregate 1
      71                 :             : 
      72                 :             : int
      73                 :           0 : m68k_return_value_location (Dwarf_Die *functypedie, const Dwarf_Op **locp)
      74                 :             : {
      75                 :             :   /* Start with the function's type, and get the DW_AT_type attribute,
      76                 :             :      which is the type of the return value.  */
      77                 :           0 :   Dwarf_Die die_mem, *typedie = &die_mem;
      78                 :           0 :   int tag = dwarf_peeled_die_type (functypedie, typedie);
      79         [ #  # ]:           0 :   if (tag <= 0)
      80                 :             :     return tag;
      81                 :             : 
      82   [ #  #  #  #  :           0 :   switch (tag)
                      # ]
      83                 :             :     {
      84                 :             :     case -1:
      85                 :             :       return -1;
      86                 :             : 
      87                 :           0 :     case DW_TAG_subrange_type:
      88         [ #  # ]:           0 :       if (! dwarf_hasattr_integrate (typedie, DW_AT_byte_size))
      89                 :             :         {
      90                 :           0 :           Dwarf_Attribute attr_mem, *attr;
      91                 :           0 :           attr = dwarf_attr_integrate (typedie, DW_AT_type, &attr_mem);
      92                 :           0 :           typedie = dwarf_formref_die (attr, &die_mem);
      93         [ #  # ]:           0 :           tag = DWARF_TAG_OR_RETURN (typedie);
      94                 :             :         }
      95                 :           0 :       FALLTHROUGH;
      96                 :             : 
      97                 :             :     case DW_TAG_base_type:
      98                 :             :     case DW_TAG_enumeration_type:
      99                 :             :     CASE_POINTER:
     100                 :             :       {
     101                 :           0 :         Dwarf_Word size;
     102                 :           0 :         Dwarf_Attribute attr_mem;
     103         [ #  # ]:           0 :         if (dwarf_formudata (dwarf_attr_integrate (typedie, DW_AT_byte_size,
     104                 :             :                                                    &attr_mem), &size) != 0)
     105                 :             :           {
     106         [ #  # ]:           0 :             if (dwarf_is_pointer (tag))
     107                 :           0 :               size = 4;
     108                 :             :             else
     109                 :           0 :               return -1;
     110                 :             :           }
     111         [ #  # ]:           0 :         if (tag == DW_TAG_base_type)
     112                 :             :           {
     113                 :           0 :             Dwarf_Word encoding;
     114         [ #  # ]:           0 :             if (dwarf_formudata (dwarf_attr_integrate (typedie, DW_AT_encoding,
     115                 :             :                                                        &attr_mem),
     116                 :             :                                  &encoding) != 0)
     117                 :           0 :               return -1;
     118         [ #  # ]:           0 :             if (encoding == DW_ATE_float)
     119                 :             :               {
     120         [ #  # ]:           0 :                 if (size > 12)
     121                 :             :                   return -2;
     122                 :           0 :                 *locp = loc_fpreg;
     123                 :           0 :                 return nloc_fpreg;
     124                 :             :               }
     125                 :             :           }
     126         [ #  # ]:           0 :         if (tag == DW_TAG_pointer_type || tag == DW_TAG_ptr_to_member_type)
     127                 :             :           {
     128                 :           0 :             *locp = loc_ptrreg;
     129                 :           0 :             return nloc_ptrreg;
     130                 :             :           }
     131                 :           0 :         *locp = loc_intreg;
     132         [ #  # ]:           0 :         if (size <= 4)
     133                 :             :           return nloc_intreg;
     134         [ #  # ]:           0 :         if (size <= 8)
     135                 :             :           return nloc_intregpair;
     136                 :             :       }
     137                 :           0 :       FALLTHROUGH;
     138                 :             :     case DW_TAG_structure_type:
     139                 :             :     case DW_TAG_class_type:
     140                 :             :     case DW_TAG_union_type:
     141                 :             :     case DW_TAG_array_type:
     142                 :           0 :       *locp = loc_aggregate;
     143                 :           0 :       return nloc_aggregate;
     144                 :             :     }
     145                 :             : 
     146                 :             :   /* XXX We don't have a good way to return specific errors from ebl calls.
     147                 :             :      This value means we do not understand the type, but it is well-formed
     148                 :             :      DWARF and might be valid.  */
     149                 :           0 :   return -2;
     150                 :             : }
        

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