LCOV - code coverage report
Current view: top level - backends - sparc_retval.c (source / functions) Coverage Total Hit
Test: elfutils-0.192 Lines: 0.0 % 44 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 % 39 0

             Branch data     Line data    Source code
       1                 :             : /* Function return value location for SPARC.
       2                 :             :    Copyright (C) 2006-2010, 2014 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 <assert.h>
      34                 :             : #include <dwarf.h>
      35                 :             : 
      36                 :             : #define BACKEND sparc_
      37                 :             : #include "libebl_CPU.h"
      38                 :             : 
      39                 :             : 
      40                 :             : /* %o0, or pair %o0, %o1.  */
      41                 :             : static const Dwarf_Op loc_intreg[] =
      42                 :             :   {
      43                 :             :     { .atom = DW_OP_reg8 }, { .atom = DW_OP_piece, .number = 4 },
      44                 :             :     { .atom = DW_OP_reg9 }, { .atom = DW_OP_piece, .number = 4 },
      45                 :             :   };
      46                 :             : #define nloc_intreg     1
      47                 :             : #define nloc_intregpair 4
      48                 :             : 
      49                 :             : /* %f0 or pair %f0, %f1, or quad %f0..%f3.  */
      50                 :             : static const Dwarf_Op loc_fpreg[] =
      51                 :             :   {
      52                 :             :     { .atom = DW_OP_regx, .number = 32 }, { .atom = DW_OP_piece, .number = 4 },
      53                 :             :     { .atom = DW_OP_regx, .number = 33 }, { .atom = DW_OP_piece, .number = 4 },
      54                 :             :     { .atom = DW_OP_regx, .number = 34 }, { .atom = DW_OP_piece, .number = 4 },
      55                 :             :     { .atom = DW_OP_regx, .number = 35 }, { .atom = DW_OP_piece, .number = 4 },
      56                 :             :   };
      57                 :             : #define nloc_fpreg      1
      58                 :             : #define nloc_fpregpair  4
      59                 :             : #define nloc_fpregquad  8
      60                 :             : 
      61                 :             : /* The return value is a structure and is actually stored in stack space
      62                 :             :    passed in a hidden argument by the caller.  But, the compiler
      63                 :             :    helpfully returns the address of that space in %o0.  */
      64                 :             : static const Dwarf_Op loc_aggregate[] =
      65                 :             :   {
      66                 :             :     { .atom = DW_OP_breg8, .number = 0 }
      67                 :             :   };
      68                 :             : #define nloc_aggregate 1
      69                 :             : 
      70                 :             : int
      71                 :           0 : sparc_return_value_location (Dwarf_Die *functypedie, const Dwarf_Op **locp)
      72                 :             : {
      73                 :             :   /* Start with the function's type, and get the DW_AT_type attribute,
      74                 :             :      which is the type of the return value.  */
      75                 :           0 :   Dwarf_Die die_mem, *typedie = &die_mem;
      76                 :           0 :   int tag = dwarf_peeled_die_type (functypedie, typedie);
      77         [ #  # ]:           0 :   if (tag <= 0)
      78                 :             :     return tag;
      79                 :             : 
      80                 :           0 :   Dwarf_Word size;
      81   [ #  #  #  #  :           0 :   switch (tag)
                      # ]
      82                 :             :     {
      83                 :             :     case -1:
      84                 :             :       return -1;
      85                 :             : 
      86                 :           0 :     case DW_TAG_subrange_type:
      87         [ #  # ]:           0 :       if (! dwarf_hasattr_integrate (typedie, DW_AT_byte_size))
      88                 :             :         {
      89                 :           0 :           Dwarf_Attribute attr_mem, *attr;
      90                 :           0 :           attr = dwarf_attr_integrate (typedie, DW_AT_type, &attr_mem);
      91                 :           0 :           typedie = dwarf_formref_die (attr, &die_mem);
      92         [ #  # ]:           0 :           tag = DWARF_TAG_OR_RETURN (typedie);
      93                 :             :         }
      94                 :           0 :       FALLTHROUGH;
      95                 :             : 
      96                 :             :     case DW_TAG_base_type:
      97                 :             :     case DW_TAG_enumeration_type:
      98                 :             :     CASE_POINTER:
      99                 :             :       {
     100                 :           0 :         Dwarf_Attribute attr_mem;
     101         [ #  # ]:           0 :         if (dwarf_formudata (dwarf_attr_integrate (typedie, DW_AT_byte_size,
     102                 :             :                                                    &attr_mem), &size) != 0)
     103                 :             :           {
     104                 :           0 :             uint8_t asize;
     105                 :           0 :             Dwarf_Die cudie;
     106         [ #  # ]:           0 :             if (dwarf_is_pointer (tag)
     107         [ #  # ]:           0 :                 && dwarf_diecu (typedie, &cudie, &asize, NULL) != NULL)
     108                 :           0 :               size = asize;
     109                 :             :             else
     110                 :           0 :               return -1;
     111                 :             :           }
     112                 :             :       }
     113                 :             : 
     114         [ #  # ]:           0 :       if (tag == DW_TAG_base_type)
     115                 :             :         {
     116                 :           0 :           Dwarf_Attribute attr_mem;
     117                 :           0 :           Dwarf_Word encoding;
     118         [ #  # ]:           0 :           if (dwarf_formudata (dwarf_attr_integrate (typedie, DW_AT_encoding,
     119                 :             :                                                      &attr_mem),
     120                 :             :                                &encoding) != 0)
     121                 :           0 :             return -1;
     122         [ #  # ]:           0 :           if (encoding == DW_ATE_float)
     123                 :             :             {
     124                 :           0 :               *locp = loc_fpreg;
     125         [ #  # ]:           0 :               if (size <= 4)
     126                 :             :                 return nloc_fpreg;
     127         [ #  # ]:           0 :               if (size <= 8)
     128                 :             :                 return nloc_fpregpair;
     129         [ #  # ]:           0 :               if (size <= 16)
     130                 :             :                 return nloc_fpregquad;
     131                 :             :             }
     132                 :             :         }
     133         [ #  # ]:           0 :       if (size <= 8)
     134                 :             :         {
     135                 :           0 :         intreg:
     136                 :           0 :           *locp = loc_intreg;
     137         [ #  # ]:           0 :           return size <= 4 ? nloc_intreg : nloc_intregpair;
     138                 :             :         }
     139                 :             : 
     140                 :           0 :     aggregate:
     141                 :           0 :       *locp = loc_aggregate;
     142                 :           0 :       return nloc_aggregate;
     143                 :             : 
     144                 :           0 :     case DW_TAG_structure_type:
     145                 :             :     case DW_TAG_class_type:
     146                 :             :     case DW_TAG_union_type:
     147                 :             :     case DW_TAG_array_type:
     148         [ #  # ]:           0 :       if (dwarf_aggregate_size (typedie, &size) == 0
     149   [ #  #  #  # ]:           0 :           && size > 0 && size <= 8)
     150                 :           0 :         goto intreg;
     151                 :           0 :       goto aggregate;
     152                 :             :     }
     153                 :             : 
     154                 :             :   /* XXX We don't have a good way to return specific errors from ebl calls.
     155                 :             :      This value means we do not understand the type, but it is well-formed
     156                 :             :      DWARF and might be valid.  */
     157                 :           0 :   return -2;
     158                 :             : }
        

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