Added preliminary support for execve(). Updates to clone, fork, exit, task handling.

It turned out we used one version of kmalloc for malloc() and another for kfree()!
Now fixed.
Added parent-child relationship to tasks. Need to polish handling CLONE_PARENT and THREAD.

tasks/mm0/include/lib/elf/elfprg.h

@@ -0,0 +1,35 @@
+/*
+ * Definitions for ELF program headers
+ * Based on Portable Formats Specification v1.1
+ *
+ * Copyright (C) 2008 Bahadir Balban
+ */
+#ifndef __ELFPRG_H__
+#define __ELFPRG_H__
+
+#include <l4/types.h>
+
+struct elf_program_header {
+	u32	p_type;		/* Type of segment */
+	u32	p_offset;	/* Segment file offset */
+	u32	p_vaddr;	/* Virtual start address */
+	u32	p_paddr;	/* Physical start address */
+	u32	p_filesz;	/* Size in stored file */
+	u32	p_memsz;	/* Size in memory image */
+	u32	p_flags;	/* Segment attributes */
+	u32	p_align;	/* Alignment requirement */
+} __attribute__((__packed__));
+
+/* Program segment type definitions */
+#define PT_NULL				0
+#define PT_LOAD				1
+#define PT_DYNAMIC			2
+#define PT_INTERP			3
+#define PT_NOTE				4
+#define PT_SHLIB			5
+#define PT_PHDR				6
+#define PT_LOPROC			0x70000000
+#define PT_HIPROC			0x7FFFFFFF
+
+
+#endif /* __ELFPRG_H__ */

tasks/mm0/include/lib/malloc.h

@@ -3,6 +3,7 @@
 
 #include <stddef.h>
 #include <string.h>
+#include <stdio.h>
 
 void *kmalloc(size_t size);
 void kfree(void *blk);