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