fix several issues relating to elf and registers and add mmap

src/include/kernel/elf.h

@@ -60,6 +60,8 @@ typedef struct{
 #define PH_TYPE_DYNAMIC 2
 #define PH_TYPE_INTERPRETER 3
 #define PH_TYPE_NOTE 4
+#define PH_TYPE_SHLIB 5
+#define PH_TYPE_PHDR 6
 
 typedef struct{
 	uint32_t type;

src/include/kernel/syscalls.h

@@ -7,5 +7,6 @@ typedef struct {
 } syscallret;
 
 syscallret syscall_libc_log(char* str);
+syscallret syscall_mmap(void* hint, size_t len, int prot, int flags, int fd, off_t offset);
 
 #endif

src/include/kernel/vmm.h

@@ -7,8 +7,10 @@
 
 #define KERNEL_SPACE_START 0xFFFF800000000000
 #define KERNEL_SPACE_END   0xFFFFFFFFFFFFFFFF
-#define USER_SPACE_START   0x1000
-#define USER_SPACE_END     0x00007FFFFFFFFFFF
+#define USER_SPACE_START   0x0
+#define USER_SPACE_END     (void*)0x00007FFFFFFFFFFF
+
+#define USER_ALLOC_START   (void*)0x1000
 
 #define VMM_TYPE_FREE 0
 #define VMM_TYPE_ANON 1
@@ -60,5 +62,6 @@ bool		vmm_map(void* paddr, void* vaddr, size_t pagec, size_t mmuflags);
 void*		vmm_alloc(size_t pagec, size_t mmuflags);
 bool		vmm_setfree(void* addr, size_t pagec);
 bool		vmm_allocnowat(void* addr, size_t mmuflags, size_t size);
+void*		vmm_allocfrom(void* addr, size_t mmuflags, size_t size);
 vmm_context*	vmm_newcontext();
 #endif