LCOV - code coverage report
Current view: top level - backends - ppc64_retval.c (source / functions) Hit Total Coverage
Test: elfutils-0.186 Lines: 0 57 0.0 %
Date: 2021-11-11 00:14:10 Functions: 0 1 0.0 %
Legend: Lines: hit not hit | Branches: + taken - not taken # not executed Branches: 0 48 0.0 %

           Branch data     Line data    Source code
       1                 :            : /* Function return value location for Linux/PPC64 ABI.
       2                 :            :    Copyright (C) 2005-2010, 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 ppc64_
      37                 :            : #include "libebl_CPU.h"
      38                 :            : 
      39                 :            : 
      40                 :            : /* r3.  */
      41                 :            : static const Dwarf_Op loc_intreg[] =
      42                 :            :   {
      43                 :            :     { .atom = DW_OP_reg3 }
      44                 :            :   };
      45                 :            : #define nloc_intreg     1
      46                 :            : 
      47                 :            : /* f1, or f1:f2, or f1:f4.  */
      48                 :            : static const Dwarf_Op loc_fpreg[] =
      49                 :            :   {
      50                 :            :     { .atom = DW_OP_regx, .number = 33 }, { .atom = DW_OP_piece, .number = 8 },
      51                 :            :     { .atom = DW_OP_regx, .number = 34 }, { .atom = DW_OP_piece, .number = 8 },
      52                 :            :     { .atom = DW_OP_regx, .number = 35 }, { .atom = DW_OP_piece, .number = 8 },
      53                 :            :     { .atom = DW_OP_regx, .number = 36 }, { .atom = DW_OP_piece, .number = 8 },
      54                 :            :   };
      55                 :            : #define nloc_fpreg      1
      56                 :            : #define nloc_fp2regs    4
      57                 :            : #define nloc_fp4regs    8
      58                 :            : 
      59                 :            : /* vr2.  */
      60                 :            : static const Dwarf_Op loc_vmxreg[] =
      61                 :            :   {
      62                 :            :     { .atom = DW_OP_regx, .number = 1124 + 2 }
      63                 :            :   };
      64                 :            : #define nloc_vmxreg     1
      65                 :            : 
      66                 :            : /* The return value is a structure and is actually stored in stack space
      67                 :            :    passed in a hidden argument by the caller.  But, the compiler
      68                 :            :    helpfully returns the address of that space in r3.  */
      69                 :            : static const Dwarf_Op loc_aggregate[] =
      70                 :            :   {
      71                 :            :     { .atom = DW_OP_breg3, .number = 0 }
      72                 :            :   };
      73                 :            : #define nloc_aggregate 1
      74                 :            : 
      75                 :            : int
      76                 :          0 : ppc64_return_value_location (Dwarf_Die *functypedie, const Dwarf_Op **locp)
      77                 :            : {
      78                 :            :   /* Start with the function's type, and get the DW_AT_type attribute,
      79                 :            :      which is the type of the return value.  */
      80                 :          0 :   Dwarf_Die die_mem, *typedie = &die_mem;
      81                 :          0 :   int tag = dwarf_peeled_die_type (functypedie, typedie);
      82         [ #  # ]:          0 :   if (tag <= 0)
      83                 :            :     return tag;
      84                 :            : 
      85                 :          0 :   Dwarf_Word size;
      86   [ #  #  #  #  :          0 :   switch (tag)
                   #  # ]
      87                 :            :     {
      88                 :            :     case -1:
      89                 :            :       return -1;
      90                 :            : 
      91                 :          0 :     case DW_TAG_subrange_type:
      92         [ #  # ]:          0 :       if (! dwarf_hasattr_integrate (typedie, DW_AT_byte_size))
      93                 :            :         {
      94                 :          0 :           Dwarf_Attribute attr_mem, *attr;
      95                 :          0 :           attr = dwarf_attr_integrate (typedie, DW_AT_type, &attr_mem);
      96                 :          0 :           typedie = dwarf_formref_die (attr, &die_mem);
      97         [ #  # ]:          0 :           tag = DWARF_TAG_OR_RETURN (typedie);
      98                 :            :         }
      99                 :          0 :       FALLTHROUGH;
     100                 :            : 
     101                 :            :     case DW_TAG_base_type:
     102                 :            :     case DW_TAG_enumeration_type:
     103                 :            :     case DW_TAG_pointer_type:
     104                 :            :     case DW_TAG_ptr_to_member_type:
     105                 :            :       {
     106                 :          0 :         Dwarf_Attribute attr_mem;
     107         [ #  # ]:          0 :         if (dwarf_formudata (dwarf_attr_integrate (typedie, DW_AT_byte_size,
     108                 :            :                                                    &attr_mem), &size) != 0)
     109                 :            :           {
     110         [ #  # ]:          0 :             if (tag == DW_TAG_pointer_type || tag == DW_TAG_ptr_to_member_type)
     111                 :          0 :               size = 8;
     112                 :            :             else
     113                 :          0 :               return -1;
     114                 :            :         }
     115                 :            :       }
     116                 :            : 
     117         [ #  # ]:          0 :       if (tag == DW_TAG_base_type)
     118                 :            :         {
     119                 :          0 :           Dwarf_Attribute attr_mem;
     120                 :          0 :           Dwarf_Word encoding;
     121         [ #  # ]:          0 :           if (dwarf_formudata (dwarf_attr_integrate (typedie, DW_AT_encoding,
     122                 :            :                                                      &attr_mem),
     123                 :            :                                &encoding) != 0)
     124                 :          0 :             return -1;
     125                 :            : 
     126         [ #  # ]:          0 :           if (encoding == DW_ATE_float || encoding == DW_ATE_complex_float)
     127                 :            :             {
     128                 :          0 :               *locp = loc_fpreg;
     129         [ #  # ]:          0 :               if (size <= 8)
     130                 :            :                 return nloc_fpreg;
     131         [ #  # ]:          0 :               if (size <= 16)
     132                 :            :                 return nloc_fp2regs;
     133         [ #  # ]:          0 :               if (size <= 32)
     134                 :            :                 return nloc_fp4regs;
     135                 :            :             }
     136                 :            :         }
     137         [ #  # ]:          0 :       if (size <= 8)
     138                 :            :         {
     139                 :          0 :         intreg:
     140                 :          0 :           *locp = loc_intreg;
     141                 :          0 :           return nloc_intreg;
     142                 :            :         }
     143                 :            : 
     144                 :          0 :       FALLTHROUGH;
     145                 :            :     case DW_TAG_structure_type:
     146                 :            :     case DW_TAG_class_type:
     147                 :            :     case DW_TAG_union_type:
     148                 :          0 :     aggregate:
     149                 :          0 :       *locp = loc_aggregate;
     150                 :          0 :       return nloc_aggregate;
     151                 :            : 
     152                 :          0 :     case DW_TAG_array_type:
     153                 :            :       {
     154                 :          0 :         Dwarf_Attribute attr_mem;
     155                 :          0 :         bool is_vector;
     156         [ #  # ]:          0 :         if (dwarf_formflag (dwarf_attr_integrate (typedie, DW_AT_GNU_vector,
     157                 :            :                                                   &attr_mem), &is_vector) == 0
     158         [ #  # ]:          0 :             && is_vector)
     159                 :            :           {
     160                 :          0 :             *locp = loc_vmxreg;
     161                 :          0 :             return nloc_vmxreg;
     162                 :            :           }
     163                 :            :       }
     164                 :          0 :       FALLTHROUGH;
     165                 :            : 
     166                 :            :     case DW_TAG_string_type:
     167   [ #  #  #  # ]:          0 :       if (dwarf_aggregate_size (typedie, &size) == 0 && size <= 8)
     168                 :            :         {
     169         [ #  # ]:          0 :           if (tag == DW_TAG_array_type)
     170                 :            :             {
     171                 :            :               /* Check if it's a character array.  */
     172                 :          0 :               Dwarf_Attribute attr_mem, *attr;
     173                 :          0 :               attr = dwarf_attr_integrate (typedie, DW_AT_type, &attr_mem);
     174                 :          0 :               typedie = dwarf_formref_die (attr, &die_mem);
     175         [ #  # ]:          0 :               tag = DWARF_TAG_OR_RETURN (typedie);
     176         [ #  # ]:          0 :               if (tag != DW_TAG_base_type)
     177                 :          0 :                 goto aggregate;
     178         [ #  # ]:          0 :               if (dwarf_formudata (dwarf_attr_integrate (typedie,
     179                 :            :                                                          DW_AT_byte_size,
     180                 :            :                                                          &attr_mem),
     181                 :            :                                    &size) != 0)
     182                 :            :                 return -1;
     183         [ #  # ]:          0 :               if (size != 1)
     184                 :          0 :                 goto aggregate;
     185                 :            :             }
     186                 :          0 :           goto intreg;
     187                 :            :         }
     188                 :          0 :       goto aggregate;
     189                 :            :     }
     190                 :            : 
     191                 :            :   /* XXX We don't have a good way to return specific errors from ebl calls.
     192                 :            :      This value means we do not understand the type, but it is well-formed
     193                 :            :      DWARF and might be valid.  */
     194                 :            :   return -2;
     195                 :            : }

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