diff --git a/libc/arch-arm/include/machine/setjmp.h b/libc/arch-arm/include/machine/setjmp.h
new file mode 100644
index 0000000..f20cab2
--- /dev/null
+++ b/libc/arch-arm/include/machine/setjmp.h
@@ -0,0 +1,87 @@
+/*	$OpenBSD: setjmp.h,v 1.1 2004/02/01 05:09:49 drahn Exp $	*/
+/*	$NetBSD: setjmp.h,v 1.2 2001/08/25 14:45:59 bjh21 Exp $	*/
+
+/*
+ * machine/setjmp.h: machine dependent setjmp-related information.
+ */
+
+#ifdef __ELF__
+#define	_JBLEN	64		/* size, in longs, of a jmp_buf */
+#else
+#define	_JBLEN	29		/* size, in longs, of a jmp_buf */
+#endif
+
+/*
+ * NOTE: The internal structure of a jmp_buf is *PRIVATE*
+ *       This information is provided as there is software
+ *       that fiddles with this with obtain the stack pointer
+ *	 (yes really ! and its commercial !).
+ *
+ * Description of the setjmp buffer
+ *
+ * word  0	magic number	(dependant on creator)
+ *       1 -  3	f4		fp register 4
+ *	 4 -  6	f5		fp register 5
+ *	 7 -  9 f6		fp register 6
+ *	10 - 12	f7		fp register 7
+ *	13	fpsr		fp status register
+ *	14	r4		register 4
+ *	15	r5		register 5
+ *	16	r6		register 6
+ *	17	r7		register 7
+ *	18	r8		register 8
+ *	19	r9		register 9
+ *	20	r10		register 10 (sl)
+ *	21	r11		register 11 (fp)
+ *	22	r12		register 12 (ip)
+ *	23	r13		register 13 (sp)
+ *	24	r14		register 14 (lr)
+ *	25	signal mask	(dependant on magic)
+ *	26	(con't)
+ *	27	(con't)
+ *	28	(con't)
+ *
+ * The magic number number identifies the jmp_buf and
+ * how the buffer was created as well as providing
+ * a sanity check
+ *
+ * A side note I should mention - Please do not tamper
+ * with the floating point fields. While they are
+ * always saved and restored at the moment this cannot
+ * be garenteed especially if the compiler happens
+ * to be generating soft-float code so no fp
+ * registers will be used.
+ *
+ * Whilst this can be seen an encouraging people to
+ * use the setjmp buffer in this way I think that it
+ * is for the best then if changes occur compiles will
+ * break rather than just having new builds falling over
+ * mysteriously.
+ */
+
+#define _JB_MAGIC__SETJMP	0x4278f500
+#define _JB_MAGIC_SETJMP	0x4278f501
+
+/* Valid for all jmp_buf's */
+
+#define _JB_MAGIC		 0
+#define _JB_REG_F4		 1
+#define _JB_REG_F5		 4
+#define _JB_REG_F6		 7
+#define _JB_REG_F7		10
+#define _JB_REG_FPSR		13
+#define _JB_REG_R4		14
+#define _JB_REG_R5		15
+#define _JB_REG_R6		16
+#define _JB_REG_R7		17
+#define _JB_REG_R8		18
+#define _JB_REG_R9		19
+#define _JB_REG_R10		20
+#define _JB_REG_R11		21
+#define _JB_REG_R12		22
+#define _JB_REG_R13		23
+#define _JB_REG_R14		24
+
+/* Only valid with the _JB_MAGIC_SETJMP magic */
+
+#define _JB_SIGMASK		25