Fixed MTP to work with TWRP

arch/x86/um/stub_64.S

@@ -0,0 +1,66 @@
+#include <as-layout.h>
+
+	.globl syscall_stub
+.section .__syscall_stub, "ax"
+syscall_stub:
+	syscall
+	/* We don't have 64-bit constants, so this constructs the address
+	 * we need.
+	 */
+	movq	$(STUB_DATA >> 32), %rbx
+	salq	$32, %rbx
+	movq	$(STUB_DATA & 0xffffffff), %rcx
+	or	%rcx, %rbx
+	movq	%rax, (%rbx)
+	int3
+
+	.globl batch_syscall_stub
+batch_syscall_stub:
+	mov	$(STUB_DATA >> 32), %rbx
+	sal	$32, %rbx
+	mov	$(STUB_DATA & 0xffffffff), %rax
+	or	%rax, %rbx
+	/* load pointer to first operation */
+	mov	%rbx, %rsp
+	add	$0x10, %rsp
+again:
+	/* load length of additional data */
+	mov	0x0(%rsp), %rax
+
+	/* if(length == 0) : end of list */
+	/* write possible 0 to header */
+	mov	%rax, 8(%rbx)
+	cmp	$0, %rax
+	jz	done
+
+	/* save current pointer */
+	mov	%rsp, 8(%rbx)
+
+	/* skip additional data */
+	add	%rax, %rsp
+
+	/* load syscall-# */
+	pop	%rax
+
+	/* load syscall params */
+	pop	%rdi
+	pop	%rsi
+	pop	%rdx
+	pop	%r10
+ 	pop	%r8
+	pop	%r9
+
+	/* execute syscall */
+	syscall
+
+	/* check return value */
+	pop	%rcx
+	cmp	%rcx, %rax
+	je	again
+
+done:
+	/* save return value */
+	mov	%rax, (%rbx)
+
+	/* stop */
+	int3