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       88003 : 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             :   char tempsym[TEMPSYMLEN];
      51             :   AsmSym_t *result;
      52             : 
      53       88003 :   if (asmscn == NULL)
      54             :     /* Something went wrong before.  */
      55             :     return NULL;
      56             : 
      57             :   /* Generate a temporary symbol if necessary.  */
      58       88003 :   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       88003 :   size_t name_len = strlen (name) + 1;
      75             : 
      76       88003 :   result = (AsmSym_t *) malloc (sizeof (AsmSym_t) + name_len);
      77       88003 :   if (result == NULL)
      78             :     return NULL;
      79             : 
      80             :   rwlock_wrlock (asmscn->ctx->lock);
      81             : 
      82       88003 :   result->scn = asmscn;
      83       88003 :   result->offset = asmscn->offset;
      84       88003 :   result->size = size;
      85       88003 :   result->type = type;
      86       88003 :   result->binding = binding;
      87       88003 :   result->symidx = 0;
      88       88003 :   result->strent = dwelf_strtab_add (asmscn->ctx->symbol_strtab,
      89       88003 :                                      memcpy (result + 1, name, name_len));
      90             : 
      91       88003 :   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       88003 :       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       88003 :       else if (name != tempsym && asm_emit_symbol_p (name))
     129             :         /* Only count non-private symbols.  */
     130       88003 :         ++asmscn->ctx->nsymbol_tab;
     131             :     }
     132             : 
     133             :   rwlock_unlock (asmscn->ctx->lock);
     134             : 
     135       88003 :   return result;
     136             : }