LCOV - code coverage report
Current view: top level - backends - ppc64_retval.c (source / functions) Hit Total Coverage
Test: elfutils-0.178 Lines: 0 58 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/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           0 :       {
     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           0 :       {
     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             :                 goto aggregate;
     185             :             }
     186           0 :           goto intreg;
     187             :         }
     188             :       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           0 :   return -2;
     195             : }

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