LCOV - code coverage report
Current view: top level - backends - sh_retval.c (source / functions) Hit Total Coverage
Test: elfutils-0.178 Lines: 0 30 0.0 %
Date: 2019-11-26 23:55:16 Functions: 0 1 0.0 %
Legend: Lines: hit not hit

          Line data    Source code
       1             : /* Function return value location for Linux/SH ABI.
       2             :    Copyright (C) 2010, 2014 Red Hat, Inc.
       3             :    This file is part of elfutils.
       4             :    Contributed by Matt Fleming <matt@console-pimps.org>.
       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 <assert.h>
      35             : #include <dwarf.h>
      36             : 
      37             : #define BACKEND sh_
      38             : #include "libebl_CPU.h"
      39             : 
      40             : 
      41             : /* This is the SVR4 ELF ABI convention, but AIX and Linux do not use it.  */
      42             : #define SVR4_STRUCT_RETURN 0
      43             : 
      44             : 
      45             : /* r0, or pair r0, r1.  */
      46             : static const Dwarf_Op loc_intreg[] =
      47             :   {
      48             :     { .atom = DW_OP_reg0 }, { .atom = DW_OP_piece, .number = 4 },
      49             :     { .atom = DW_OP_reg1 }, { .atom = DW_OP_piece, .number = 4 },
      50             :   };
      51             : #define nloc_intreg     1
      52             : #define nloc_intregpair 4
      53             : 
      54             : /* fr0 or fr1.  */
      55             : static const Dwarf_Op loc_fpreg[] =
      56             :   {
      57             :     { .atom = DW_OP_reg25 }, { .atom = DW_OP_piece, .number = 4 },
      58             :     { .atom = DW_OP_reg26 }, { .atom = DW_OP_piece, .number = 4 },
      59             :   };
      60             : #define nloc_fpreg      1
      61             : #define nloc_fpregpair  2
      62             : 
      63             : int
      64           0 : sh_return_value_location (Dwarf_Die *functypedie, const Dwarf_Op **locp)
      65             : {
      66             :   /* Start with the function's type, and get the DW_AT_type attribute,
      67             :      which is the type of the return value.  */
      68           0 :   Dwarf_Die die_mem, *typedie = &die_mem;
      69           0 :   int tag = dwarf_peeled_die_type (functypedie, typedie);
      70           0 :   if (tag <= 0)
      71             :     return tag;
      72             : 
      73           0 :   Dwarf_Word size;
      74           0 :   switch (tag)
      75             :     {
      76             :     case -1:
      77             :       return -1;
      78             : 
      79           0 :     case DW_TAG_subrange_type:
      80           0 :       if (! dwarf_hasattr_integrate (typedie, DW_AT_byte_size))
      81             :         {
      82           0 :           Dwarf_Attribute attr_mem, *attr;
      83           0 :           attr = dwarf_attr_integrate (typedie, DW_AT_type, &attr_mem);
      84           0 :           typedie = dwarf_formref_die (attr, &die_mem);
      85           0 :           tag = DWARF_TAG_OR_RETURN (typedie);
      86             :         }
      87           0 :       FALLTHROUGH;
      88             : 
      89             :     case DW_TAG_base_type:
      90             :     case DW_TAG_enumeration_type:
      91             :     case DW_TAG_pointer_type:
      92             :     case DW_TAG_ptr_to_member_type:
      93           0 :       {
      94           0 :         Dwarf_Attribute attr_mem;
      95           0 :         if (dwarf_formudata (dwarf_attr_integrate (typedie, DW_AT_byte_size,
      96             :                                                    &attr_mem), &size) != 0)
      97             :           {
      98           0 :             if (tag == DW_TAG_pointer_type || tag == DW_TAG_ptr_to_member_type)
      99           0 :               size = 4;
     100             :             else
     101           0 :               return -1;
     102             :           }
     103             :       }
     104             : 
     105           0 :       if (size <= 8)
     106             :         {
     107           0 :           if (tag == DW_TAG_base_type)
     108             :             {
     109           0 :               Dwarf_Attribute attr_mem;
     110           0 :               Dwarf_Word encoding;
     111           0 :               if (dwarf_formudata (dwarf_attr_integrate (typedie,
     112             :                                                          DW_AT_encoding,
     113             :                                                          &attr_mem),
     114             :                                    &encoding) != 0)
     115           0 :                 return -1;
     116           0 :               if (encoding == DW_ATE_float)
     117             :                 {
     118           0 :                   *locp = loc_fpreg;
     119           0 :                   return size <= 4 ? nloc_fpreg : nloc_fpregpair;
     120             :                 }
     121             :             }
     122           0 :           *locp = loc_intreg;
     123           0 :           return size <= 4 ? nloc_intreg : nloc_intregpair;
     124             :         }
     125             :     }
     126             : 
     127             :   /* XXX We don't have a good way to return specific errors from ebl calls.
     128             :      This value means we do not understand the type, but it is well-formed
     129             :      DWARF and might be valid.  */
     130             :   return -2;
     131             : }

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