1 /* Create new ABS symbol. 2 Copyright (C) 2002 Red Hat, Inc. 3 This file is part of elfutils. 4 Written by Ulrich Drepper <drepper (at) 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_abs_scn = 45 { 46 .data = { 47 .main = { 48 .scn = ASM_ABS_SCN 49 } 50 } 51 }; 52 53 54 AsmSym_t * 55 asm_newabssym (AsmCtx_t *ctx, const char *name, GElf_Xword size, 56 GElf_Addr value, int type, int binding) 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_abs_scn; 79 result->size = size; 80 result->type = type; 81 result->binding = binding; 82 result->symidx = 0; 83 result->strent = ebl_strtabadd (ctx->symbol_strtab, name, 0); 84 85 /* The value of an ABS symbol must not be modified. Since there are 86 no subsection and the initial offset of the section is 0 we can 87 get the alignment recorded by storing it into the offset 88 field. */ 89 result->offset = value; 90 91 if (unlikely (ctx->textp)) 92 { 93 /* An absolute symbol can be defined by giving a symbol a 94 specific value. */ 95 if (binding == STB_GLOBAL) 96 fprintf (ctx->out.file, "\t.globl %s\n", name); 97 else if (binding == STB_WEAK) 98 fprintf (ctx->out.file, "\t.weak %s\n", name); 99 100 if (type == STT_OBJECT) 101 fprintf (ctx->out.file, "\t.type %s,@object\n", name); 102 else if (type == STT_FUNC) 103 fprintf (ctx->out.file, "\t.type %s,@function\n", name); 104 105 fprintf (ctx->out.file, "%s = %llu\n", 106 name, (unsigned long long int) value); 107 108 if (size != 0) 109 fprintf (ctx->out.file, "\t.size %s, %llu\n", 110 name, (unsigned long long int) size); 111 } 112 else 113 { 114 /* Put the symbol in the hash table so that we can later find it. */ 115 if (asm_symbol_tab_insert (&ctx->symbol_tab, elf_hash (name), result) 116 != 0) 117 { 118 /* The symbol already exists. */ 119 __libasm_seterrno (ASM_E_DUPLSYM); 120 free (result); 121 result = NULL; 122 } 123 else if (name != NULL && asm_emit_symbol_p (name)) 124 /* Only count non-private symbols. */ 125 ++ctx->nsymbol_tab; 126 } 127 128 rwlock_unlock (ctx->lock); 129 130 return result; 131 } 132
