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m68k/libelf/lib/newscn.c

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+/*
+ * newscn.c - implementation of the elf_newscn(3) function.
+ * Copyright (C) 1995 - 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: newscn.c,v 1.1 2008/06/16 00:01:22 cjohns Exp $";
+#endif /* lint */
+
+int
+_elf_update_shnum(Elf *elf, size_t shnum) {
+    size_t extshnum = 0;
+    Elf_Scn *scn;
+
+    elf_assert(elf);
+    elf_assert(elf->e_ehdr);
+    scn = elf->e_scn_1;
+    elf_assert(scn);
+    elf_assert(scn->s_index == 0);
+    if (shnum >= SHN_LORESERVE) {
+	extshnum = shnum;
+	shnum = 0;
+    }
+    if (elf->e_class == ELFCLASS32) {
+	((Elf32_Ehdr*)elf->e_ehdr)->e_shnum = shnum;
+	scn->s_shdr32.sh_size = extshnum;
+    }
+#if __LIBELF64
+    else if (elf->e_class == ELFCLASS64) {
+	((Elf64_Ehdr*)elf->e_ehdr)->e_shnum = shnum;
+	scn->s_shdr64.sh_size = extshnum;
+    }
+#endif /* __LIBELF64 */
+    else {
+	if (valid_class(elf->e_class)) {
+	    seterr(ERROR_UNIMPLEMENTED);
+	}
+	else {
+	    seterr(ERROR_UNKNOWN_CLASS);
+	}
+	return -1;
+    }
+    elf->e_ehdr_flags |= ELF_F_DIRTY;
+    scn->s_shdr_flags |= ELF_F_DIRTY;
+    return 0;
+}
+
+static Elf_Scn*
+_makescn(Elf *elf, size_t index) {
+    Elf_Scn *scn;
+
+    elf_assert(elf);
+    elf_assert(elf->e_magic == ELF_MAGIC);
+    elf_assert(elf->e_ehdr);
+    elf_assert(_elf_scn_init.s_magic == SCN_MAGIC);
+    if (!(scn = (Elf_Scn*)malloc(sizeof(*scn)))) {
+	seterr(ERROR_MEM_SCN);
+	return NULL;
+    }
+    *scn = _elf_scn_init;
+    scn->s_elf = elf;
+    scn->s_scn_flags = ELF_F_DIRTY;
+    scn->s_shdr_flags = ELF_F_DIRTY;
+    scn->s_freeme = 1;
+    scn->s_index = index;
+    return scn;
+}
+
+Elf_Scn*
+_elf_first_scn(Elf *elf) {
+    Elf_Scn *scn;
+
+    elf_assert(elf);
+    elf_assert(elf->e_magic == ELF_MAGIC);
+    if ((scn = elf->e_scn_1)) {
+	return scn;
+    }
+    if ((scn = _makescn(elf, 0))) {
+	elf->e_scn_1 = elf->e_scn_n = scn;
+	if (_elf_update_shnum(elf, 1)) {
+	    free(scn);
+	    elf->e_scn_1 = elf->e_scn_n = scn = NULL;
+	}
+    }
+    return scn;
+}
+
+static Elf_Scn*
+_buildscn(Elf *elf) {
+    Elf_Scn *scn;
+
+    if (!_elf_first_scn(elf)) {
+	return NULL;
+    }
+    scn = elf->e_scn_n;
+    elf_assert(scn);
+    if (!(scn = _makescn(elf, scn->s_index + 1))) {
+	return NULL;
+    }
+    if (_elf_update_shnum(elf, scn->s_index + 1)) {
+	free(scn);
+	return NULL;
+    }
+    elf->e_scn_n = elf->e_scn_n->s_link = scn;
+    return scn;
+}
+
+Elf_Scn*
+elf_newscn(Elf *elf) {
+    Elf_Scn *scn;
+
+    if (!elf) {
+	return NULL;
+    }
+    elf_assert(elf->e_magic == ELF_MAGIC);
+    if (!elf->e_readable && !elf->e_ehdr) {
+	seterr(ERROR_NOEHDR);
+    }
+    else if (elf->e_kind != ELF_K_ELF) {
+	seterr(ERROR_NOTELF);
+    }
+    else if (!elf->e_ehdr && !_elf_cook(elf)) {
+	return NULL;
+    }
+    else if ((scn = _buildscn(elf))) {
+	return scn;
+    }
+    return NULL;
+}