Branch data     Line data    Source code

       1                 :            : /* Define new symbol for current position in given section.
       2                 :            :    Copyright (C) 2002, 2005, 2016, 2017 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                 :            : AsmSym_t *
      44                 :     176006 : asm_newsym (AsmScn_t *asmscn, const char *name, GElf_Xword size,
      45                 :            :             int type, int binding)
      46                 :            : {
      47                 :            : /* We don't really expect labels with many digits, but in theory it could
      48                 :            :    be 10 digits (plus ".L" and a zero terminator).  */
      49                 :            : #define TEMPSYMLEN 13
      50                 :     176006 :   char tempsym[TEMPSYMLEN];
      51                 :     176006 :   AsmSym_t *result;
      52                 :            : 
      53         [ -  + ]:     176006 :   if (asmscn == NULL)
      54                 :            :     /* Something went wrong before.  */
      55                 :            :     return NULL;
      56                 :            : 
      57                 :            :   /* Generate a temporary symbol if necessary.  */
      58         [ -  + ]:     176006 :   if (name == NULL)
      59                 :            :     {
      60                 :            :       /* If a local symbol name is created the symbol better have
      61                 :            :          local binding.  */
      62         [ #  # ]:          0 :       if (binding != STB_LOCAL)
      63                 :            :         {
      64                 :          0 :           __libasm_seterrno (ASM_E_INVALID);
      65                 :          0 :           return NULL;
      66                 :            :         }
      67                 :            : 
      68                 :            :       // XXX This requires getting the format from the machine backend.  */
      69                 :          0 :       snprintf (tempsym, TEMPSYMLEN, ".L%07u", asmscn->ctx->tempsym_count++);
      70                 :            : 
      71                 :          0 :       name = tempsym;
      72                 :            :     }
      73                 :            : 
      74                 :     176006 :   size_t name_len = strlen (name) + 1;
      75                 :            : 
      76                 :     176006 :   result = malloc (sizeof (AsmSym_t) + name_len);
      77         [ -  + ]:     176006 :   if (result == NULL)
      78                 :            :     return NULL;
      79                 :            : 
      80                 :     176006 :   rwlock_wrlock (asmscn->ctx->lock);
      81                 :            : 
      82                 :     176006 :   result->scn = asmscn;
      83                 :     176006 :   result->offset = asmscn->offset;
      84                 :     176006 :   result->size = size;
      85                 :     176006 :   result->type = type;
      86                 :     176006 :   result->binding = binding;
      87                 :     176006 :   result->symidx = 0;
      88                 :     352012 :   result->strent = dwelf_strtab_add (asmscn->ctx->symbol_strtab,
      89                 :     176006 :                                      memcpy (result + 1, name, name_len));
      90                 :            : 
      91         [ -  + ]:     176006 :   if (unlikely (asmscn->ctx->textp))
      92                 :            :     {
      93                 :            :       /* We are only interested in the name and don't need to know whether
      94                 :            :          it is a local name or not.  */
      95                 :            :       /* First print the binding pseudo-op.  */
      96         [ #  # ]:          0 :       if (binding == STB_GLOBAL)
      97                 :          0 :         fprintf (asmscn->ctx->out.file, "\t.globl\t%s\n", name);
      98         [ #  # ]:          0 :       else if (binding == STB_WEAK)
      99                 :          0 :         fprintf (asmscn->ctx->out.file, "\t.weak\t%s\n", name);
     100                 :            : 
     101                 :            :       /* Next the symbol type.  */
     102         [ #  # ]:          0 :       if (type == STT_OBJECT)
     103                 :          0 :         fprintf (asmscn->ctx->out.file, "\t.type\t%s,@object\n", name);
     104         [ #  # ]:          0 :       else if (type == STT_FUNC)
     105                 :          0 :         fprintf (asmscn->ctx->out.file, "\t.type\t%s,@function\n", name);
     106                 :            : 
     107                 :            :       /* Finally the size and the label.  */
     108                 :          0 :       fprintf (asmscn->ctx->out.file, "\t.size\t%s,%" PRIuMAX "\n%s:\n",
     109                 :            :                name, (uintmax_t) size, name);
     110                 :            :     }
     111                 :            :   else
     112                 :            :     {
     113                 :            :       /* Put the symbol in the hash table so that we can later find it.  */
     114         [ -  + ]:     176006 :       if (asm_symbol_tab_insert (&asmscn->ctx->symbol_tab, elf_hash (name),
     115                 :            :                                  result) != 0)
     116                 :            :         {
     117                 :            :           /* The symbol already exists.  */
     118                 :          0 :           __libasm_seterrno (ASM_E_DUPLSYM);
     119                 :            :           /* Note that we can free the entry since there must be no
     120                 :            :              reference in the string table to the string.  We can only
     121                 :            :              fail to insert the symbol into the symbol table if there
     122                 :            :              is already a symbol with this name.  In this case the
     123                 :            :              dwelf_strtab_add function would use the previously provided
     124                 :            :              name.  */
     125                 :          0 :           free (result);
     126                 :          0 :           result = NULL;
     127                 :            :         }
     128   [ -  +  -  + ]:     176006 :       else if (name != tempsym && asm_emit_symbol_p (name))
     129                 :            :         /* Only count non-private symbols.  */
     130                 :     176006 :         ++asmscn->ctx->nsymbol_tab;
     131                 :            :     }
     132                 :            : 
     133                 :     176006 :   rwlock_unlock (asmscn->ctx->lock);
     134                 :            : 
     135                 :     176006 :   return result;
     136                 :            : }