Squashed 'third_party/elfutils/' content from commit 555e15e
Change-Id: I61cde98949e47e5c8c09c33260de17f30921be79
git-subtree-dir: third_party/elfutils
git-subtree-split: 555e15ebe8bf1eb33d00747173cfc80cc65648a4
diff --git a/libasm/asm_newsym.c b/libasm/asm_newsym.c
new file mode 100644
index 0000000..5389166
--- /dev/null
+++ b/libasm/asm_newsym.c
@@ -0,0 +1,136 @@
+/* Define new symbol for current position in given section.
+ Copyright (C) 2002, 2005, 2016, 2017 Red Hat, Inc.
+ This file is part of elfutils.
+ Written by Ulrich Drepper <drepper@redhat.com>, 2002.
+
+ This file is free software; you can redistribute it and/or modify
+ it under the terms of either
+
+ * the GNU Lesser General Public License as published by the Free
+ Software Foundation; either version 3 of the License, or (at
+ your option) any later version
+
+ or
+
+ * the GNU General Public License as published by the Free
+ Software Foundation; either version 2 of the License, or (at
+ your option) any later version
+
+ or both in parallel, as here.
+
+ elfutils is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ General Public License for more details.
+
+ You should have received copies of the GNU General Public License and
+ the GNU Lesser General Public License along with this program. If
+ not, see <http://www.gnu.org/licenses/>. */
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include <inttypes.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <libasmP.h>
+#include <system.h>
+
+
+AsmSym_t *
+asm_newsym (AsmScn_t *asmscn, const char *name, GElf_Xword size,
+ int type, int binding)
+{
+/* We don't really expect labels with many digits, but in theory it could
+ be 10 digits (plus ".L" and a zero terminator). */
+#define TEMPSYMLEN 13
+ char tempsym[TEMPSYMLEN];
+ AsmSym_t *result;
+
+ if (asmscn == NULL)
+ /* Something went wrong before. */
+ return NULL;
+
+ /* Generate a temporary symbol if necessary. */
+ if (name == NULL)
+ {
+ /* If a local symbol name is created the symbol better have
+ local binding. */
+ if (binding != STB_LOCAL)
+ {
+ __libasm_seterrno (ASM_E_INVALID);
+ return NULL;
+ }
+
+ // XXX This requires getting the format from the machine backend. */
+ snprintf (tempsym, TEMPSYMLEN, ".L%07u", asmscn->ctx->tempsym_count++);
+
+ name = tempsym;
+ }
+
+ size_t name_len = strlen (name) + 1;
+
+ result = (AsmSym_t *) malloc (sizeof (AsmSym_t) + name_len);
+ if (result == NULL)
+ return NULL;
+
+ rwlock_wrlock (asmscn->ctx->lock);
+
+ result->scn = asmscn;
+ result->offset = asmscn->offset;
+ result->size = size;
+ result->type = type;
+ result->binding = binding;
+ result->symidx = 0;
+ result->strent = dwelf_strtab_add (asmscn->ctx->symbol_strtab,
+ memcpy (result + 1, name, name_len));
+
+ if (unlikely (asmscn->ctx->textp))
+ {
+ /* We are only interested in the name and don't need to know whether
+ it is a local name or not. */
+ /* First print the binding pseudo-op. */
+ if (binding == STB_GLOBAL)
+ fprintf (asmscn->ctx->out.file, "\t.globl\t%s\n", name);
+ else if (binding == STB_WEAK)
+ fprintf (asmscn->ctx->out.file, "\t.weak\t%s\n", name);
+
+ /* Next the symbol type. */
+ if (type == STT_OBJECT)
+ fprintf (asmscn->ctx->out.file, "\t.type\t%s,@object\n", name);
+ else if (type == STT_FUNC)
+ fprintf (asmscn->ctx->out.file, "\t.type\t%s,@function\n", name);
+
+ /* Finally the size and the label. */
+ fprintf (asmscn->ctx->out.file, "\t.size\t%s,%" PRIuMAX "\n%s:\n",
+ name, (uintmax_t) size, name);
+ }
+ else
+ {
+ /* Put the symbol in the hash table so that we can later find it. */
+ if (asm_symbol_tab_insert (&asmscn->ctx->symbol_tab, elf_hash (name),
+ result) != 0)
+ {
+ /* The symbol already exists. */
+ __libasm_seterrno (ASM_E_DUPLSYM);
+ /* Note that we can free the entry since there must be no
+ reference in the string table to the string. We can only
+ fail to insert the symbol into the symbol table if there
+ is already a symbol with this name. In this case the
+ dwelf_strtab_add function would use the previously provided
+ name. */
+ free (result);
+ result = NULL;
+ }
+ else if (name != tempsym && asm_emit_symbol_p (name))
+ /* Only count non-private symbols. */
+ ++asmscn->ctx->nsymbol_tab;
+ }
+
+ rwlock_unlock (asmscn->ctx->lock);
+
+ return result;
+}