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 43AsmSym_t * 44asm_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 if (asmscn == NULL) 54 /* Something went wrong before. */ 55 return NULL; 56 57 /* Generate a temporary symbol if necessary. */ 58 if (name == NULL) 59 { 60 /* If a local symbol name is created the symbol better have 61 local binding. */ 62 if (binding != STB_LOCAL) 63 { 64 __libasm_seterrno (ASM_E_INVALID); 65 return NULL; 66 } 67 68 // XXX This requires getting the format from the machine backend. */ 69 snprintf (tempsym, TEMPSYMLEN, ".L%07u", asmscn->ctx->tempsym_count++); 70 71 name = tempsym; 72 } 73 74 size_t name_len = strlen (name) + 1; 75 76 result = malloc (sizeof (AsmSym_t) + name_len); 77 if (result == NULL) 78 return NULL; 79 80 rwlock_wrlock (asmscn->ctx->lock); 81 82 result->scn = asmscn; 83 result->offset = asmscn->offset; 84 result->size = size; 85 result->type = type; 86 result->binding = binding; 87 result->symidx = 0; 88 result->strent = dwelf_strtab_add (asmscn->ctx->symbol_strtab, 89 memcpy (result + 1, name, name_len)); 90 91 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 if (binding == STB_GLOBAL) 97 fprintf (asmscn->ctx->out.file, "\t.globl\t%s\n", name); 98 else if (binding == STB_WEAK) 99 fprintf (asmscn->ctx->out.file, "\t.weak\t%s\n", name); 100 101 /* Next the symbol type. */ 102 if (type == STT_OBJECT) 103 fprintf (asmscn->ctx->out.file, "\t.type\t%s,@object\n", name); 104 else if (type == STT_FUNC) 105 fprintf (asmscn->ctx->out.file, "\t.type\t%s,@function\n", name); 106 107 /* Finally the size and the label. */ 108 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 if (asm_symbol_tab_insert (&asmscn->ctx->symbol_tab, elf_hash (name), 115 result) != 0) 116 { 117 /* The symbol already exists. */ 118 __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 free (result); 126 result = NULL; 127 } 128 else if (name != tempsym && asm_emit_symbol_p (name)) 129 /* Only count non-private symbols. */ 130 ++asmscn->ctx->nsymbol_tab; 131 } 132 133 rwlock_unlock (asmscn->ctx->lock); 134 135 return result; 136} 137