LCOV - code coverage report
Current view: top level - backends - riscv_retval.c (source / functions) Hit Total Coverage
Test: elfutils-0.189 Lines: 0 89 0.0 %
Date: 2023-10-25 13:46:23 Functions: 0 5 0.0 %
Legend: Lines: hit not hit | Branches: + taken - not taken # not executed Branches: 0 60 0.0 %

           Branch data     Line data    Source code
       1                 :            : /* Function return value location for Linux/RISC-V ABI.
       2                 :            :    Copyright (C) 2018 Sifive, Inc.
       3                 :            :    Copyright (C) 2013 Red Hat, 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 <stdio.h>
      35                 :            : #include <inttypes.h>
      36                 :            : 
      37                 :            : #include <assert.h>
      38                 :            : #include <dwarf.h>
      39                 :            : 
      40                 :            : #define BACKEND riscv_
      41                 :            : #include "libebl_CPU.h"
      42                 :            : 
      43                 :            : static int
      44                 :          0 : dwarf_bytesize_aux (Dwarf_Die *die, Dwarf_Word *sizep)
      45                 :            : {
      46                 :          0 :   int bits;
      47         [ #  # ]:          0 :   if (((bits = 8 * dwarf_bytesize (die)) < 0
      48         [ #  # ]:          0 :        && (bits = dwarf_bitsize (die)) < 0)
      49         [ #  # ]:          0 :       || bits % 8 != 0)
      50                 :          0 :     return -1;
      51                 :            : 
      52                 :          0 :   *sizep = bits / 8;
      53                 :          0 :   return 0;
      54                 :            : }
      55                 :            : 
      56                 :            : static int
      57                 :          0 : pass_in_gpr_lp64 (const Dwarf_Op **locp, Dwarf_Word size)
      58                 :            : {
      59                 :          0 :   static const Dwarf_Op loc[] =
      60                 :            :     {
      61                 :            :       { .atom = DW_OP_reg10 }, { .atom = DW_OP_piece, .number = 8 },
      62                 :            :       { .atom = DW_OP_reg11 }, { .atom = DW_OP_piece, .number = 8 }
      63                 :            :     };
      64                 :            : 
      65                 :          0 :   *locp = loc;
      66                 :          0 :   return size <= 8 ? 1 : 4;
      67                 :            : }
      68                 :            : 
      69                 :            : static int
      70                 :          0 : pass_by_ref (const Dwarf_Op **locp)
      71                 :            : {
      72                 :          0 :   static const Dwarf_Op loc[] = { { .atom = DW_OP_breg10 } };
      73                 :            : 
      74                 :          0 :   *locp = loc;
      75                 :          0 :   return 1;
      76                 :            : }
      77                 :            : 
      78                 :            : static int
      79                 :          0 : pass_in_fpr_lp64f (const Dwarf_Op **locp, Dwarf_Word size)
      80                 :            : {
      81                 :          0 :   static const Dwarf_Op loc[] =
      82                 :            :     {
      83                 :            :       { .atom = DW_OP_regx, .number = 42 },
      84                 :            :       { .atom = DW_OP_piece, .number = 4 },
      85                 :            :       { .atom = DW_OP_regx, .number = 43 },
      86                 :            :       { .atom = DW_OP_piece, .number = 4 }
      87                 :            :     };
      88                 :            : 
      89                 :          0 :   *locp = loc;
      90                 :          0 :   return size <= 4 ? 1 : 4;
      91                 :            : }
      92                 :            : 
      93                 :            : static int
      94                 :          0 : pass_in_fpr_lp64d (const Dwarf_Op **locp, Dwarf_Word size)
      95                 :            : {
      96                 :          0 :   static const Dwarf_Op loc[] =
      97                 :            :     {
      98                 :            :       { .atom = DW_OP_regx, .number = 42 },
      99                 :            :       { .atom = DW_OP_piece, .number = 8 },
     100                 :            :       { .atom = DW_OP_regx, .number = 43 },
     101                 :            :       { .atom = DW_OP_piece, .number = 8 }
     102                 :            :     };
     103                 :            : 
     104                 :          0 :   *locp = loc;
     105                 :          0 :   return size <= 8 ? 1 : 4;
     106                 :            : }
     107                 :            : 
     108                 :            : static int
     109                 :            : flatten_aggregate_arg (Dwarf_Die *typedie __attribute__ ((unused)),
     110                 :            :                        Dwarf_Die *arg0 __attribute__ ((unused)),
     111                 :            :                        Dwarf_Die *arg1 __attribute__ ((unused)))
     112                 :            : {
     113                 :            :   /* ??? */
     114                 :            :   return 1;
     115                 :            : }
     116                 :            : 
     117                 :            : static int
     118                 :            : pass_by_flattened_arg (const Dwarf_Op **locp __attribute__ ((unused)),
     119                 :            :                        Dwarf_Word size __attribute__ ((unused)),
     120                 :            :                        Dwarf_Die *arg0 __attribute__ ((unused)),
     121                 :            :                        Dwarf_Die *arg1 __attribute__ ((unused)))
     122                 :            : {
     123                 :            :   /* ??? */
     124                 :            :   return -2;
     125                 :            : }
     126                 :            : 
     127                 :            : int
     128                 :          0 : riscv_return_value_location_lp64ifd (int fp, Dwarf_Die *functypedie,
     129                 :            :                                      const Dwarf_Op **locp)
     130                 :            : {
     131                 :            :   /* Start with the function's type, and get the DW_AT_type attribute,
     132                 :            :      which is the type of the return value.  */
     133                 :          0 :   Dwarf_Die typedie;
     134                 :          0 :   int tag = dwarf_peeled_die_type (functypedie, &typedie);
     135         [ #  # ]:          0 :   if (tag <= 0)
     136                 :            :     return tag;
     137                 :            : 
     138                 :          0 :   Dwarf_Word size = (Dwarf_Word)-1;
     139                 :            : 
     140                 :            :   /* If the argument type is a Composite Type that is larger than 16
     141                 :            :      bytes, then the argument is copied to memory allocated by the
     142                 :            :      caller and the argument is replaced by a pointer to the copy.  */
     143         [ #  # ]:          0 :   if (tag == DW_TAG_structure_type || tag == DW_TAG_union_type
     144         [ #  # ]:          0 :       || tag == DW_TAG_class_type || tag == DW_TAG_array_type)
     145                 :            :     {
     146                 :          0 :       Dwarf_Die arg0, arg1;
     147                 :            : 
     148         [ #  # ]:          0 :       if (dwarf_aggregate_size (&typedie, &size) < 0)
     149                 :            :         return -1;
     150                 :            :       /* A struct containing just one floating-point real is passed as though
     151                 :            :          it were a standalone floating-point real.  A struct containing two
     152                 :            :          floating-point reals is passed in two floating-point registers, if
     153                 :            :          neither is more than FLEN bits wide.  A struct containing just one
     154                 :            :          complex floating-point number is passed as though it were a struct
     155                 :            :          containing two floating-point reals.  A struct containing one
     156                 :            :          floating-point real and one integer (or bitfield), in either order,
     157                 :            :          is passed in a floating-point register and an integer register,
     158                 :            :          provided the floating-point real is no more than FLEN bits wide and
     159                 :            :          the integer is no more than XLEN bits wide.  */
     160         [ #  # ]:          0 :       if (tag == DW_TAG_structure_type
     161                 :            :           && flatten_aggregate_arg (&typedie, &arg0, &arg1))
     162                 :          0 :         return pass_by_flattened_arg (locp, size, &arg0, &arg1);
     163                 :            :       /* Aggregates larger than 2*XLEN bits are passed by reference.  */
     164         [ #  # ]:          0 :       else if (size > 16)
     165                 :          0 :         return pass_by_ref (locp);
     166                 :            :       /* Aggregates whose total size is no more than XLEN bits are passed in
     167                 :            :          a register.  Aggregates whose total size is no more than 2*XLEN bits
     168                 :            :          are passed in a pair of registers.  */
     169                 :            :       else
     170         [ #  # ]:          0 :         return pass_in_gpr_lp64 (locp, size);
     171                 :            :     }
     172                 :            : 
     173   [ #  #  #  # ]:          0 :   if (tag == DW_TAG_base_type || dwarf_is_pointer (tag))
     174                 :            :     {
     175         [ #  # ]:          0 :       if (dwarf_bytesize_aux (&typedie, &size) < 0)
     176                 :            :         {
     177         [ #  # ]:          0 :           if (dwarf_is_pointer (tag))
     178                 :          0 :             size = 8;
     179                 :            :           else
     180                 :            :             return -1;
     181                 :            :         }
     182                 :            : 
     183                 :          0 :       Dwarf_Attribute attr_mem;
     184         [ #  # ]:          0 :       if (tag == DW_TAG_base_type)
     185                 :            :         {
     186                 :          0 :           Dwarf_Word encoding;
     187         [ #  # ]:          0 :           if (dwarf_formudata (dwarf_attr_integrate (&typedie, DW_AT_encoding,
     188                 :            :                                                      &attr_mem),
     189                 :            :                                &encoding) != 0)
     190                 :            :             return -1;
     191                 :            : 
     192   [ #  #  #  # ]:          0 :           switch (encoding)
     193                 :            :             {
     194                 :          0 :             case DW_ATE_boolean:
     195                 :            :             case DW_ATE_signed:
     196                 :            :             case DW_ATE_unsigned:
     197                 :            :             case DW_ATE_unsigned_char:
     198                 :            :             case DW_ATE_signed_char:
     199                 :            :               /* Scalars that are at most XLEN bits wide are passed in a single
     200                 :            :                  argument register.  Scalars that are 2*XLEN bits wide are
     201                 :            :                  passed in a pair of argument registers.  Scalars wider than
     202                 :            :                  2*XLEN are passed by reference; there are none for LP64D.  */
     203         [ #  # ]:          0 :               return pass_in_gpr_lp64 (locp, size);
     204                 :            : 
     205                 :          0 :             case DW_ATE_float:
     206                 :            :               /* A real floating-point argument is passed in a floating-point
     207                 :            :                  argument register if it is no more than FLEN bits wide,
     208                 :            :                  otherwise it is passed according to the integer calling
     209                 :            :                  convention.  */
     210   [ #  #  #  # ]:          0 :               switch (size)
     211                 :            :                 {
     212                 :          0 :                 case 4: /* single */
     213      [ #  #  # ]:          0 :                   switch (fp)
     214                 :            :                     {
     215                 :          0 :                     case EF_RISCV_FLOAT_ABI_DOUBLE:
     216                 :            :                     case EF_RISCV_FLOAT_ABI_SINGLE:
     217                 :          0 :                       return pass_in_fpr_lp64d (locp, size);
     218                 :          0 :                     case EF_RISCV_FLOAT_ABI_SOFT:
     219                 :          0 :                       return pass_in_gpr_lp64 (locp, size);
     220                 :            :                     default:
     221                 :            :                       return -2;
     222                 :            :                     }
     223                 :          0 :                 case 8: /* double */
     224      [ #  #  # ]:          0 :                   switch (fp)
     225                 :            :                     {
     226                 :          0 :                     case EF_RISCV_FLOAT_ABI_DOUBLE:
     227                 :          0 :                       return pass_in_fpr_lp64d (locp, size);
     228                 :          0 :                     case EF_RISCV_FLOAT_ABI_SINGLE:
     229                 :            :                     case EF_RISCV_FLOAT_ABI_SOFT:
     230                 :          0 :                       return pass_in_gpr_lp64 (locp, size);
     231                 :            :                     default:
     232                 :            :                       return -2;
     233                 :            :                     }
     234                 :            : 
     235                 :          0 :                 case 16: /* quad */
     236                 :          0 :                   return pass_in_gpr_lp64 (locp, size);
     237                 :            : 
     238                 :            :                 default:
     239                 :            :                   return -2;
     240                 :            :                 }
     241                 :            : 
     242                 :          0 :             case DW_ATE_complex_float:
     243                 :            :               /* A complex floating-point number is passed as though it were a
     244                 :            :                  struct containing two floating-point reals.  */
     245   [ #  #  #  # ]:          0 :               switch (size)
     246                 :            :                 {
     247                 :          0 :                 case 8: /* float _Complex */
     248      [ #  #  # ]:          0 :                   switch (fp)
     249                 :            :                     {
     250                 :          0 :                     case EF_RISCV_FLOAT_ABI_DOUBLE:
     251                 :            :                     case EF_RISCV_FLOAT_ABI_SINGLE:
     252                 :          0 :                       return pass_in_fpr_lp64f (locp, size);
     253                 :          0 :                     case EF_RISCV_FLOAT_ABI_SOFT:
     254                 :            :                       /* Double the size so the vals are two registers. */
     255                 :          0 :                       return pass_in_gpr_lp64 (locp, size * 2);
     256                 :            :                     default:
     257                 :            :                       return -2;
     258                 :            :                     }
     259                 :            : 
     260                 :          0 :                 case 16: /* double _Complex */
     261      [ #  #  # ]:          0 :                   switch (fp)
     262                 :            :                     {
     263                 :          0 :                     case EF_RISCV_FLOAT_ABI_DOUBLE:
     264                 :          0 :                       return pass_in_fpr_lp64d (locp, size);
     265                 :          0 :                     case EF_RISCV_FLOAT_ABI_SINGLE:
     266                 :            :                     case EF_RISCV_FLOAT_ABI_SOFT:
     267                 :          0 :                       return pass_in_gpr_lp64 (locp, size);
     268                 :            :                     default:
     269                 :            :                       return -2;
     270                 :            :                     }
     271                 :            : 
     272                 :            :                 case 32: /* long double _Complex */
     273                 :          0 :                   return pass_by_ref (locp);
     274                 :            : 
     275                 :            :                 default:
     276                 :            :                   return -2;
     277                 :            :                 }
     278                 :            :             }
     279                 :            : 
     280                 :            :           return -2;
     281                 :            :         }
     282                 :            :       else
     283         [ #  # ]:          0 :         return pass_in_gpr_lp64 (locp, size);
     284                 :            :     }
     285                 :            : 
     286                 :          0 :   *locp = NULL;
     287                 :          0 :   return 0;
     288                 :            : }
     289                 :            : 
     290                 :            : int
     291                 :          0 : riscv_return_value_location_lp64d (Dwarf_Die *functypedie,
     292                 :            :                                    const Dwarf_Op **locp)
     293                 :            : {
     294                 :          0 :   return riscv_return_value_location_lp64ifd (EF_RISCV_FLOAT_ABI_DOUBLE,
     295                 :            :                                               functypedie, locp);
     296                 :            : }
     297                 :            : 
     298                 :            : int
     299                 :          0 : riscv_return_value_location_lp64f (Dwarf_Die *functypedie,
     300                 :            :                                    const Dwarf_Op **locp)
     301                 :            : {
     302                 :          0 :   return riscv_return_value_location_lp64ifd (EF_RISCV_FLOAT_ABI_SINGLE,
     303                 :            :                                               functypedie, locp);
     304                 :            : }
     305                 :            : 
     306                 :            : int
     307                 :          0 : riscv_return_value_location_lp64 (Dwarf_Die *functypedie,
     308                 :            :                                   const Dwarf_Op **locp)
     309                 :            : {
     310                 :          0 :   return riscv_return_value_location_lp64ifd (EF_RISCV_FLOAT_ABI_SOFT,
     311                 :            :                                               functypedie, locp);
     312                 :            : }

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