1 /* Create new COMMON symbol. 2 Copyright (C) 2002 Red Hat, Inc. 3 This file is part of Red Hat elfutils. 4 Written by Ulrich Drepper <drepper (at) redhat.com>, 2002. 5 6 Red Hat elfutils is free software; you can redistribute it and/or modify 7 it under the terms of the GNU General Public License as published by the 8 Free Software Foundation; version 2 of the License. 9 10 Red Hat elfutils is distributed in the hope that it will be useful, but 11 WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 General Public License for more details. 14 15 You should have received a copy of the GNU General Public License along 16 with Red Hat elfutils; if not, write to the Free Software Foundation, 17 Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA. 18 19 Red Hat elfutils is an included package of the Open Invention Network. 20 An included package of the Open Invention Network is a package for which 21 Open Invention Network licensees cross-license their patents. No patent 22 license is granted, either expressly or impliedly, by designation as an 23 included package. Should you wish to participate in the Open Invention 24 Network licensing program, please visit www.openinventionnetwork.com 25 <http://www.openinventionnetwork.com>. */ 26 27 #ifdef HAVE_CONFIG_H 28 # include <config.h> 29 #endif 30 31 #include <inttypes.h> 32 #include <stdio.h> 33 #include <stdlib.h> 34 #include <string.h> 35 36 #include <libasmP.h> 37 #include <system.h> 38 39 40 /* Object for special COMMON section. */ 41 static const AsmScn_t __libasm_com_scn = 42 { 43 .data = { 44 .main = { 45 .scn = ASM_COM_SCN 46 } 47 } 48 }; 49 50 51 AsmSym_t * 52 asm_newcomsym (ctx, name, size, align) 53 AsmCtx_t *ctx; 54 const char *name; 55 GElf_Xword size; 56 GElf_Addr align; 57 { 58 AsmSym_t *result; 59 60 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 if (name == NULL) 67 { 68 __libasm_seterrno (ASM_E_INVALID); 69 return NULL; 70 } 71 72 rwlock_wrlock (ctx->lock); 73 74 result = (AsmSym_t *) malloc (sizeof (AsmSym_t)); 75 if (result == NULL) 76 return NULL; 77 78 result->scn = (AsmScn_t *) &__libasm_com_scn; 79 result->size = size; 80 /* XXX Do we have to allow a different type? */ 81 result->type = STT_OBJECT; 82 /* XXX Do we have to allow a different binding? */ 83 result->binding = STB_GLOBAL; 84 result->symidx = 0; 85 result->strent = ebl_strtabadd (ctx->symbol_strtab, name, 0); 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 result->offset = align; 91 92 if (unlikely (ctx->textp)) 93 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 if (asm_symbol_tab_insert (&ctx->symbol_tab, elf_hash (name), result) 99 != 0) 100 { 101 /* The symbol already exists. */ 102 __libasm_seterrno (ASM_E_DUPLSYM); 103 free (result); 104 result = NULL; 105 } 106 else if (name != NULL && asm_emit_symbol_p (name)) 107 /* Only count non-private symbols. */ 108 ++ctx->nsymbol_tab; 109 } 110 111 rwlock_unlock (ctx->lock); 112 113 return result; 114 } 115
