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       1                 :             : /* Create new COMMON symbol.
       2                 :             :    Copyright (C) 2002, 2016 Red Hat, Inc.
       3                 :             :    This file is part of elfutils.
       4                 :             :    Written by Ulrich Drepper <drepper@redhat.com>, 2002.
       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 <inttypes.h>
      35                 :             : #include <stdio.h>
      36                 :             : #include <stdlib.h>
      37                 :             : #include <string.h>
      38                 :             : 
      39                 :             : #include <libasmP.h>
      40                 :             : #include <system.h>
      41                 :             : 
      42                 :             : 
      43                 :             : /* Object for special COMMON section.  */
      44                 :             : static const AsmScn_t __libasm_com_scn =
      45                 :             :   {
      46                 :             :     .data = {
      47                 :             :       .main = {
      48                 :             :         .scn = ASM_COM_SCN
      49                 :             :       }
      50                 :             :     }
      51                 :             :   };
      52                 :             : 
      53                 :             : 
      54                 :             : AsmSym_t *
      55                 :           2 : asm_newcomsym (AsmCtx_t *ctx, const char *name, GElf_Xword size,
      56                 :             :                GElf_Addr align)
      57                 :             : {
      58                 :           2 :   AsmSym_t *result;
      59                 :             : 
      60         [ -  + ]:           2 :   if (ctx == NULL)
      61                 :             :     /* Something went wrong before.  */
      62                 :             :     return NULL;
      63                 :             : 
      64                 :             :   /* Common symbols are public.  Therefore the user must provide a
      65                 :             :      name.  */
      66         [ -  + ]:           2 :   if (name == NULL)
      67                 :             :     {
      68                 :           0 :       __libasm_seterrno (ASM_E_INVALID);
      69                 :           0 :       return NULL;
      70                 :             :     }
      71                 :             : 
      72                 :           2 :   rwlock_wrlock (ctx->lock);
      73                 :             : 
      74                 :           2 :   result = malloc (sizeof (AsmSym_t));
      75         [ -  + ]:           2 :   if (result == NULL)
      76                 :             :     return NULL;
      77                 :             : 
      78                 :           2 :   result->scn = (AsmScn_t *) &__libasm_com_scn;
      79                 :           2 :   result->size = size;
      80                 :             :   /* XXX Do we have to allow a different type?  */
      81                 :           2 :   result->type = STT_OBJECT;
      82                 :             :   /* XXX Do we have to allow a different binding?  */
      83                 :           2 :   result->binding = STB_GLOBAL;
      84                 :           2 :   result->symidx = 0;
      85                 :           2 :   result->strent = dwelf_strtab_add (ctx->symbol_strtab, name);
      86                 :             : 
      87                 :             :   /* The value of a COM symbol is the alignment.  Since there are no
      88                 :             :      subsection and the initial offset of the section is 0 we can get
      89                 :             :      the alignment recorded by storing it into the offset field.  */
      90                 :           2 :   result->offset = align;
      91                 :             : 
      92         [ -  + ]:           2 :   if (unlikely (ctx->textp))
      93                 :           0 :     fprintf (ctx->out.file, "\t.comm %s, %" PRIuMAX ", %" PRIuMAX "\n",
      94                 :             :              name, (uintmax_t) size, (uintmax_t) align);
      95                 :             :   else
      96                 :             :     {
      97                 :             :       /* Put the symbol in the hash table so that we can later find it.  */
      98         [ -  + ]:           2 :       if (asm_symbol_tab_insert (&ctx->symbol_tab, elf_hash (name), result)
      99                 :             :           != 0)
     100                 :             :         {
     101                 :             :           /* The symbol already exists.  */
     102                 :           0 :           __libasm_seterrno (ASM_E_DUPLSYM);
     103                 :           0 :           free (result);
     104                 :           0 :           result = NULL;
     105                 :             :         }
     106         [ -  + ]:           2 :       else if (name != NULL && asm_emit_symbol_p (name))
     107                 :             :         /* Only count non-private symbols.  */
     108                 :           2 :         ++ctx->nsymbol_tab;
     109                 :             :     }
     110                 :             : 
     111                 :             :   rwlock_unlock (ctx->lock);
     112                 :             : 
     113                 :             :   return result;
     114                 :             : }