diff --git a/src/libthread/FreeBSDasm.s b/src/libthread/FreeBSDasm.s
new file mode 100644
index 0000000..f9a8025
--- /dev/null
+++ b/src/libthread/FreeBSDasm.s
@@ -0,0 +1,54 @@
+.globl _tas
+_tas:
+	movl $0xCAFEBABE, %eax
+	movl 4(%esp), %ecx
+	xchgl %eax, 0(%ecx)
+	ret
+
+.globl setmcontext
+setmcontext:
+	movl 4(%esp), %edx
+	movl	8(%edx), %fs
+	movl	12(%edx), %es
+	movl	16(%edx), %ds
+	movl	76(%edx), %ss
+	movl	20(%edx), %edi
+	movl	24(%edx), %esi
+	movl	28(%edx), %ebp
+	movl	%esp, %ecx		 
+	movl	72(%edx), %esp		 
+	pushl	60(%edx)	/* eip */	 
+	pushl	44(%edx)	/* ecx */	 
+	pushl	48(%edx)	/* eax */	 
+	movl	36(%edx), %ebx		 
+	movl	40(%edx), %edx
+	movl	12(%ecx), %eax		 
+	popl	%eax			 
+	popl	%ecx
+	ret
+
+.globl getmcontext
+getmcontext:
+	pushl	%edx
+	movl	8(%esp), %edx
+	movl	%fs, 8(%edx)
+	movl	%es, 12(%edx)
+	movl	%ds, 16(%edx)
+	movl	%ss, 76(%edx)
+	movl	%edi, 20(%edx)
+	movl	%esi, 24(%edx)
+	movl	%ebp, 28(%edx)
+	movl	%ebx, 36(%edx)
+	movl	$1, 48(%edx)
+	popl	%eax
+	movl	%eax, 40(%edx)		 
+	movl	%ecx, 44(%edx)
+	movl	(%esp), %eax	/* eip */		 
+	movl	%eax, 60(%edx)		 
+	movl	%esp, %eax		 
+	addl	$4, %eax	/* setmcontext will re-push the eip */	 
+	movl	%eax, 72(%edx)
+	movl	40(%edx), %edx		 
+	xorl	%eax, %eax		 
+	ret
+