user thread/process and elf loader stub

src/include/kernel/elf.h

@@ -0,0 +1,74 @@
+#ifndef _ELF_H_INCLUDE
+#define _ELF_H_INCLUDE
+
+#include <kernel/sched.h>
+#include <kernel/vfs.h>
+#include <stddef.h>
+#include <stdint.h>
+
+#define ELF_MAGIC 0x464c457f // 0x7F ELF
+#define ELF_BITS_64 2
+#define ELF_ISA_X86_64 0x3E
+#define ELF_ENDIANNESS_LITTLE 1
+
+#define ELF_RELOCATABLE 1
+#define ELF_EXECUTABLE 2
+#define ELF_SHARED 3
+#define ELF_CORE 4
+
+#define ELF_SEGMENT_NULL 0
+#define ELF_SEGMENT_LOAD 1
+#define ELF_SEGMENT_DYNAMIC 2
+#define ELF_SEGMENT_INTERP 3
+#define ELF_SEGMENT_NOTE 4
+
+#define ELF_FLAG_EXECUTABLE 1
+#define ELF_FLAG_WRITABLE 2
+#define ELF_FLAG_READABLE 4
+
+
+typedef struct{
+	uint32_t magic;
+	uint8_t bits;
+	uint8_t endianness;
+	uint8_t headversion;
+	uint8_t abi;
+	uint64_t padding;
+	uint16_t type;
+	uint16_t isa;
+	uint32_t elfver;
+	uint64_t entry;
+	uint64_t ph_pos;
+	uint64_t sh_pos;
+	uint32_t flags;
+	uint16_t headsize;
+	uint16_t ph_size;
+	uint16_t ph_count;
+	uint16_t sh_size;
+	uint16_t sh_count;
+	uint16_t sh_names;
+} __attribute__((packed)) elf_header64;
+
+#define PH_TYPE_LOAD 1
+#define PH_TYPE_DYNAMIC 2
+#define PH_TYPE_INTERPRETER 3
+#define PH_TYPE_NOTE 4
+
+typedef struct{
+	uint32_t type;
+	uint32_t flags;
+	uint64_t offset;
+	uint64_t memaddr;
+	uint64_t undefined;
+	uint64_t fsize;
+	uint64_t msize;
+	uint64_t alignment;
+} elf_ph64;
+
+// loads an elf executable from file, setting target thread with appropriate
+// values for it
+// also sets up the stack for said executable
+
+int elf_load(thread_t* thread, vnode_t* node, char** argv, char** env);
+
+#endif