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137 lines
4.1 KiB
137 lines
4.1 KiB
/* Define new symbol for current position in given section.
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Copyright (C) 2002, 2005, 2016, 2017 Red Hat, Inc.
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This file is part of elfutils.
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Written by Ulrich Drepper <drepper@redhat.com>, 2002.
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This file is free software; you can redistribute it and/or modify
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it under the terms of either
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* the GNU Lesser General Public License as published by the Free
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Software Foundation; either version 3 of the License, or (at
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your option) any later version
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or
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* the GNU General Public License as published by the Free
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Software Foundation; either version 2 of the License, or (at
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your option) any later version
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or both in parallel, as here.
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elfutils is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received copies of the GNU General Public License and
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the GNU Lesser General Public License along with this program. If
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not, see <http://www.gnu.org/licenses/>. */
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include <inttypes.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <libasmP.h>
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#include <system.h>
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AsmSym_t *
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asm_newsym (AsmScn_t *asmscn, const char *name, GElf_Xword size,
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int type, int binding)
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{
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/* We don't really expect labels with many digits, but in theory it could
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be 10 digits (plus ".L" and a zero terminator). */
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#define TEMPSYMLEN 13
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char tempsym[TEMPSYMLEN];
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AsmSym_t *result;
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if (asmscn == NULL)
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/* Something went wrong before. */
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return NULL;
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/* Generate a temporary symbol if necessary. */
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if (name == NULL)
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{
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/* If a local symbol name is created the symbol better have
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local binding. */
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if (binding != STB_LOCAL)
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{
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__libasm_seterrno (ASM_E_INVALID);
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return NULL;
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}
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// XXX This requires getting the format from the machine backend. */
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snprintf (tempsym, TEMPSYMLEN, ".L%07u", asmscn->ctx->tempsym_count++);
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name = tempsym;
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}
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size_t name_len = strlen (name) + 1;
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result = (AsmSym_t *) malloc (sizeof (AsmSym_t) + name_len);
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if (result == NULL)
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return NULL;
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rwlock_wrlock (asmscn->ctx->lock);
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result->scn = asmscn;
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result->offset = asmscn->offset;
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result->size = size;
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result->type = type;
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result->binding = binding;
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result->symidx = 0;
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result->strent = dwelf_strtab_add (asmscn->ctx->symbol_strtab,
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memcpy (result + 1, name, name_len));
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if (unlikely (asmscn->ctx->textp))
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{
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/* We are only interested in the name and don't need to know whether
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it is a local name or not. */
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/* First print the binding pseudo-op. */
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if (binding == STB_GLOBAL)
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fprintf (asmscn->ctx->out.file, "\t.globl\t%s\n", name);
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else if (binding == STB_WEAK)
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fprintf (asmscn->ctx->out.file, "\t.weak\t%s\n", name);
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/* Next the symbol type. */
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if (type == STT_OBJECT)
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fprintf (asmscn->ctx->out.file, "\t.type\t%s,@object\n", name);
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else if (type == STT_FUNC)
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fprintf (asmscn->ctx->out.file, "\t.type\t%s,@function\n", name);
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/* Finally the size and the label. */
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fprintf (asmscn->ctx->out.file, "\t.size\t%s,%" PRIuMAX "\n%s:\n",
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name, (uintmax_t) size, name);
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}
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else
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{
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/* Put the symbol in the hash table so that we can later find it. */
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if (asm_symbol_tab_insert (&asmscn->ctx->symbol_tab, elf_hash (name),
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result) != 0)
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{
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/* The symbol already exists. */
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__libasm_seterrno (ASM_E_DUPLSYM);
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/* Note that we can free the entry since there must be no
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reference in the string table to the string. We can only
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fail to insert the symbol into the symbol table if there
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is already a symbol with this name. In this case the
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dwelf_strtab_add function would use the previously provided
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name. */
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free (result);
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result = NULL;
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}
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else if (name != tempsym && asm_emit_symbol_p (name))
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/* Only count non-private symbols. */
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++asmscn->ctx->nsymbol_tab;
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}
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rwlock_unlock (asmscn->ctx->lock);
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return result;
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}
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