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m68k/libelf/lib/x.elfext.c

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+/*
+ * x.elfext.c -- handle ELF format extensions
+ * Copyright (C) 2002 - 2006 Michael Riepe
+ * 
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ * 
+ * This library 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
+ * Library General Public License for more details.
+ * 
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include <private.h>
+
+#ifndef lint
+static const char rcsid[] = "@(#) $Id: x.elfext.c,v 1.1 2008/06/16 00:01:22 cjohns Exp $";
+#endif /* lint */
+
+int
+elf_getphnum(Elf *elf, size_t *resultp) {
+    if (!elf) {
+	return LIBELF_FAILURE;
+    }
+    elf_assert(elf->e_magic == ELF_MAGIC);
+    if (elf->e_kind != ELF_K_ELF) {
+	seterr(ERROR_NOTELF);
+	return LIBELF_FAILURE;
+    }
+    if (!elf->e_ehdr && !_elf_cook(elf)) {
+	return LIBELF_FAILURE;
+    }
+    if (resultp) {
+	*resultp = elf->e_phnum;
+    }
+    return LIBELF_SUCCESS;
+}
+
+int
+elf_getshnum(Elf *elf, size_t *resultp) {
+    size_t num = 0;
+    Elf_Scn *scn;
+
+    if (!elf) {
+	return LIBELF_FAILURE;
+    }
+    elf_assert(elf->e_magic == ELF_MAGIC);
+    if (elf->e_kind != ELF_K_ELF) {
+	seterr(ERROR_NOTELF);
+	return LIBELF_FAILURE;
+    }
+    if (!elf->e_ehdr && !_elf_cook(elf)) {
+	return LIBELF_FAILURE;
+    }
+    if ((scn = elf->e_scn_n)) {
+	num = scn->s_index + 1;
+    }
+    if (resultp) {
+	*resultp = num;
+    }
+    return LIBELF_SUCCESS;
+}
+
+int
+elf_getshstrndx(Elf *elf, size_t *resultp) {
+    size_t num = 0;
+    size_t dummy;
+    Elf_Scn *scn;
+
+    if (!elf) {
+	return LIBELF_FAILURE;
+    }
+    elf_assert(elf->e_magic == ELF_MAGIC);
+    if (resultp == NULL) {
+	resultp = &dummy;	/* handle NULL pointer gracefully */
+    }
+    if (elf->e_kind != ELF_K_ELF) {
+	seterr(ERROR_NOTELF);
+	return LIBELF_FAILURE;
+    }
+    if (!elf->e_ehdr && !_elf_cook(elf)) {
+	return LIBELF_FAILURE;
+    }
+    if (elf->e_class == ELFCLASS32) {
+	num = ((Elf32_Ehdr*)elf->e_ehdr)->e_shstrndx;
+    }
+#if __LIBELF64
+    else if (elf->e_class == ELFCLASS64) {
+	num = ((Elf64_Ehdr*)elf->e_ehdr)->e_shstrndx;
+    }
+#endif /* __LIBELF64 */
+    else {
+	if (valid_class(elf->e_class)) {
+	    seterr(ERROR_UNIMPLEMENTED);
+	}
+	else {
+	    seterr(ERROR_UNKNOWN_CLASS);
+	}
+	return LIBELF_FAILURE;
+    }
+    if (num != SHN_XINDEX) {
+	*resultp = num;
+	return LIBELF_SUCCESS;
+    }
+    /*
+     * look at first section header
+     */
+    if (!(scn = elf->e_scn_1)) {
+	seterr(ERROR_NOSUCHSCN);
+	return LIBELF_FAILURE;
+    }
+    elf_assert(scn->s_magic == SCN_MAGIC);
+#if __LIBELF64
+    if (elf->e_class == ELFCLASS64) {
+	*resultp = scn->s_shdr64.sh_link;
+	return LIBELF_SUCCESS;
+    }
+#endif /* __LIBELF64 */
+    *resultp = scn->s_shdr32.sh_link;
+    return LIBELF_SUCCESS;
+}
+
+int
+elfx_update_shstrndx(Elf *elf, size_t value) {
+    size_t extvalue = 0;
+    Elf_Scn *scn;
+
+    if (!elf) {
+	return LIBELF_FAILURE;
+    }
+    elf_assert(elf->e_magic == ELF_MAGIC);
+    if (value >= SHN_LORESERVE) {
+	extvalue = value;
+	value = SHN_XINDEX;
+    }
+    if (elf->e_kind != ELF_K_ELF) {
+	seterr(ERROR_NOTELF);
+	return LIBELF_FAILURE;
+    }
+    if (!elf->e_ehdr && !_elf_cook(elf)) {
+	return LIBELF_FAILURE;
+    }
+    if (!(scn = _elf_first_scn(elf))) {
+	return LIBELF_FAILURE;
+    }
+    elf_assert(scn->s_magic == SCN_MAGIC);
+    if (elf->e_class == ELFCLASS32) {
+	((Elf32_Ehdr*)elf->e_ehdr)->e_shstrndx = value;
+	scn->s_shdr32.sh_link = extvalue;
+    }
+#if __LIBELF64
+    else if (elf->e_class == ELFCLASS64) {
+	((Elf64_Ehdr*)elf->e_ehdr)->e_shstrndx = value;
+	scn->s_shdr64.sh_link = extvalue;
+    }
+#endif /* __LIBELF64 */
+    else {
+	if (valid_class(elf->e_class)) {
+	    seterr(ERROR_UNIMPLEMENTED);
+	}
+	else {
+	    seterr(ERROR_UNKNOWN_CLASS);
+	}
+	return LIBELF_FAILURE;
+    }
+    elf->e_ehdr_flags |= ELF_F_DIRTY;
+    scn->s_shdr_flags |= ELF_F_DIRTY;
+    return LIBELF_SUCCESS;
+}