LCOV - code coverage report
Current view: top level - backends - mips_retval.c (source / functions) Hit Total Coverage
Test: elfutils-0.191 Lines: 0 45 0.0 %
Date: 2024-07-04 23:21:52 Functions: 0 1 0.0 %
Legend: Lines: hit not hit | Branches: + taken - not taken # not executed Branches: 0 40 0.0 %

           Branch data     Line data    Source code
       1                 :            : /* Function return value location for Linux/mips ABI.
       2                 :            :    Copyright (C) 2005 Red Hat, Inc.
       3                 :            :    Copyright (C) 2024 CIP United Inc.
       4                 :            :    This file is part of elfutils.
       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                 :            : #include <string.h>
      37                 :            : #include <elf.h>
      38                 :            : #include <stdio.h>
      39                 :            : 
      40                 :            : #define BACKEND mips_
      41                 :            : #include "libebl_CPU.h"
      42                 :            : #include "libdwP.h"
      43                 :            : #include <stdio.h>
      44                 :            : 
      45                 :            : /* $v0 or pair $v0, $v1 */
      46                 :            : static const Dwarf_Op loc_intreg_o32[] =
      47                 :            :   {
      48                 :            :     { .atom = DW_OP_reg2 }, { .atom = DW_OP_piece, .number = 4 },
      49                 :            :     { .atom = DW_OP_reg3 }, { .atom = DW_OP_piece, .number = 4 },
      50                 :            :   };
      51                 :            : 
      52                 :            : static const Dwarf_Op loc_intreg[] =
      53                 :            :   {
      54                 :            :     { .atom = DW_OP_reg2 }, { .atom = DW_OP_piece, .number = 8 },
      55                 :            :     { .atom = DW_OP_reg3 }, { .atom = DW_OP_piece, .number = 8 },
      56                 :            :   };
      57                 :            : #define nloc_intreg     1
      58                 :            : #define nloc_intregpair 4
      59                 :            : 
      60                 :            : /* $f0 (float), or pair $f0, $f1 (double).
      61                 :            :  * f2/f3 are used for COMPLEX (= 2 doubles) returns in Fortran */
      62                 :            : static const Dwarf_Op loc_fpreg_o32[] =
      63                 :            :   {
      64                 :            :     { .atom = DW_OP_regx, .number = 32 }, { .atom = DW_OP_piece, .number = 4 },
      65                 :            :     { .atom = DW_OP_regx, .number = 33 }, { .atom = DW_OP_piece, .number = 4 },
      66                 :            :     { .atom = DW_OP_regx, .number = 34 }, { .atom = DW_OP_piece, .number = 4 },
      67                 :            :     { .atom = DW_OP_regx, .number = 35 }, { .atom = DW_OP_piece, .number = 4 },
      68                 :            :   };
      69                 :            : 
      70                 :            : /* $f0, or pair $f0, $f2.  */
      71                 :            : static const Dwarf_Op loc_fpreg[] =
      72                 :            :   {
      73                 :            :     { .atom = DW_OP_regx, .number = 32 }, { .atom = DW_OP_piece, .number = 8 },
      74                 :            :     { .atom = DW_OP_regx, .number = 34 }, { .atom = DW_OP_piece, .number = 8 },
      75                 :            :   };
      76                 :            : #define nloc_fpreg  1
      77                 :            : #define nloc_fpregpair 4
      78                 :            : #define nloc_fpregquad 8
      79                 :            : 
      80                 :            : /* The return value is a structure and is actually stored in stack space
      81                 :            :    passed in a hidden argument by the caller.  But, the compiler
      82                 :            :    helpfully returns the address of that space in $v0.  */
      83                 :            : static const Dwarf_Op loc_aggregate[] =
      84                 :            :   {
      85                 :            :     { .atom = DW_OP_breg2, .number = 0 }
      86                 :            :   };
      87                 :            : #define nloc_aggregate 1
      88                 :            : 
      89                 :            : int
      90                 :          0 : mips_return_value_location (Dwarf_Die *functypedie, const Dwarf_Op **locp)
      91                 :            : {
      92         [ #  # ]:          0 :   unsigned int regsize = (gelf_getclass (functypedie->cu->dbg->elf) == ELFCLASS32 ) ? 4 : 8;
      93                 :          0 :   if (!regsize)
      94                 :            :     return -2;
      95                 :            : 
      96                 :            :   /* Start with the function's type, and get the DW_AT_type attribute,
      97                 :            :      which is the type of the return value.  */
      98                 :            : 
      99                 :          0 :   Dwarf_Attribute attr_mem;
     100                 :          0 :   Dwarf_Attribute *attr = dwarf_attr_integrate (functypedie, DW_AT_type, &attr_mem);
     101         [ #  # ]:          0 :   if (attr == NULL)
     102                 :            :     /* The function has no return value, like a `void' function in C.  */
     103                 :            :     return 0;
     104                 :            : 
     105                 :          0 :   Dwarf_Die die_mem;
     106                 :          0 :   Dwarf_Die *typedie = dwarf_formref_die (attr, &die_mem);
     107                 :          0 :   int tag = dwarf_tag (typedie);
     108                 :            : 
     109                 :            :   /* Follow typedefs and qualifiers to get to the actual type.  */
     110                 :          0 :   while (tag == DW_TAG_typedef
     111                 :          0 :          || tag == DW_TAG_const_type || tag == DW_TAG_volatile_type
     112   [ #  #  #  # ]:          0 :          || tag == DW_TAG_restrict_type)
     113                 :            :     {
     114                 :          0 :       attr = dwarf_attr_integrate (typedie, DW_AT_type, &attr_mem);
     115                 :          0 :       typedie = dwarf_formref_die (attr, &die_mem);
     116                 :          0 :       tag = dwarf_tag (typedie);
     117                 :            :     }
     118                 :            : 
     119   [ #  #  #  #  :          0 :   switch (tag)
                   #  # ]
     120                 :            :     {
     121                 :            :     case -1:
     122                 :            :       return -1;
     123                 :            : 
     124                 :          0 :     case DW_TAG_subrange_type:
     125         [ #  # ]:          0 :       if (! dwarf_hasattr_integrate (typedie, DW_AT_byte_size))
     126                 :            :         {
     127                 :          0 :           attr = dwarf_attr_integrate (typedie, DW_AT_type, &attr_mem);
     128                 :          0 :           typedie = dwarf_formref_die (attr, &die_mem);
     129                 :          0 :           tag = dwarf_tag (typedie);
     130                 :            :         }
     131                 :            :       /* Fall through.  */
     132                 :          0 :       FALLTHROUGH;
     133                 :            : 
     134                 :            :     case DW_TAG_base_type:
     135                 :            :     case DW_TAG_enumeration_type:
     136                 :            :     CASE_POINTER:
     137                 :            :       {
     138                 :          0 :         Dwarf_Word size;
     139         [ #  # ]:          0 :         if (dwarf_formudata (dwarf_attr_integrate (typedie, DW_AT_byte_size,
     140                 :            :                                          &attr_mem), &size) != 0)
     141                 :            :           {
     142         [ #  # ]:          0 :             if (dwarf_is_pointer (tag))
     143                 :          0 :               size = regsize;
     144                 :            :             else
     145                 :          0 :               return -1;
     146                 :            :           }
     147         [ #  # ]:          0 :         if (tag == DW_TAG_base_type)
     148                 :            :           {
     149                 :          0 :             Dwarf_Word encoding;
     150         [ #  # ]:          0 :             if (dwarf_formudata (dwarf_attr_integrate (typedie, DW_AT_encoding,
     151                 :            :                                              &attr_mem), &encoding) != 0)
     152                 :          0 :               return -1;
     153                 :            : 
     154                 :            : #define ARCH_LOC(loc, regsize) ((regsize) == 4 ? (loc ## _o32) : (loc))
     155                 :            : 
     156         [ #  # ]:          0 :             if (encoding == DW_ATE_float)
     157                 :            :               {
     158         [ #  # ]:          0 :                 *locp = ARCH_LOC(loc_fpreg, regsize);
     159         [ #  # ]:          0 :                 if (size <= regsize)
     160                 :            :                   return nloc_fpreg;
     161                 :            : 
     162         [ #  # ]:          0 :                 if (size <= 2*regsize)
     163                 :            :                   return nloc_fpregpair;
     164                 :            : 
     165         [ #  # ]:          0 :                 if (size <= 4*regsize)
     166                 :            :                   return nloc_fpregquad;
     167                 :            : 
     168                 :          0 :                 goto aggregate;
     169                 :            :               }
     170                 :            :           }
     171         [ #  # ]:          0 :         *locp = ARCH_LOC(loc_intreg, regsize);
     172         [ #  # ]:          0 :         if (size <= regsize)
     173                 :            :           return nloc_intreg;
     174         [ #  # ]:          0 :         if (size <= 2*regsize)
     175                 :            :           return nloc_intregpair;
     176                 :            : 
     177                 :            :         /* Else fall through. Shouldn't happen though (at least with gcc) */
     178                 :            :       }
     179                 :          0 :       FALLTHROUGH;
     180                 :            : 
     181                 :            :     case DW_TAG_structure_type:
     182                 :            :     case DW_TAG_class_type:
     183                 :            :     case DW_TAG_union_type:
     184                 :            :     case DW_TAG_array_type:
     185                 :          0 :     aggregate:
     186                 :          0 :       *locp = loc_aggregate;
     187                 :          0 :       return nloc_aggregate;
     188                 :            :     case DW_TAG_unspecified_type:
     189                 :            :       return 0;
     190                 :            :     }
     191                 :            : 
     192                 :            :   /* XXX We don't have a good way to return specific errors from ebl calls.
     193                 :            :      This value means we do not understand the type, but it is well-formed
     194                 :            :      DWARF and might be valid.  */
     195                 :          0 :   return -2;
     196                 :            : }

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