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diff --git a/libc/sysdeps/linux/alpha/bits/setjmp.h b/libc/sysdeps/linux/alpha/bits/setjmp.h
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+/* Define the machine-dependent type `jmp_buf'. Alpha version.
+ Copyright (C) 1992, 1997 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, write to the Free
+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ 02111-1307 USA. */
+
+#ifndef _SETJMP_H
+# error "Never include <bits/setjmp.h> directly; use <setjmp.h> instead."
+#endif
+
+/* The previous bits/setjmp.h had __jmp_buf defined as a structure.
+ We use an array of 'long int' instead, to make writing the
+ assembler easier. Naturally, user code should not depend on
+ either representation. */
+
+/*
+ * Integer registers:
+ * $0 is the return value (va);
+ * $1-$8, $22-$25, $28 are call-used (t0-t7, t8-t11, at);
+ * $9-$14 we save here (s0-s5);
+ * $15 is the FP and we save it here (fp or s6);
+ * $16-$21 are input arguments (call-used) (a0-a5);
+ * $26 is the return PC and we save it here (ra);
+ * $27 is the procedure value (i.e., the address of __setjmp) (pv or t12);
+ * $29 is the global pointer, which the caller will reconstruct
+ * from the return address restored in $26 (gp);
+ * $30 is the stack pointer and we save it here (sp);
+ * $31 is always zero (zero).
+ *
+ * Floating-point registers:
+ * $f0 is the floating return value;
+ * $f1, $f10-$f15, $f22-$f30 are call-used;
+ * $f2-$f9 we save here;
+ * $f16-$21 are input args (call-used);
+ * $f31 is always zero.
+ *
+ * Note that even on Alpha hardware that does not have an FPU (there
+ * isn't such a thing currently) it is required to implement the FP
+ * registers.
+ */
+
+#if defined __USE_MISC || defined __ASSEMBLY__
+# define JB_S0 0
+# define JB_S1 1
+# define JB_S2 2
+# define JB_S3 3
+# define JB_S4 4
+# define JB_S5 5
+# define JB_PC 6
+# define JB_FP 7
+# define JB_SP 8
+# define JB_F2 9
+# define JB_F3 10
+# define JB_F4 11
+# define JB_F5 12
+# define JB_F6 13
+# define JB_F7 14
+# define JB_F8 15
+# define JB_F9 16
+#endif
+
+#ifndef __ASSEMBLY__
+typedef long int __jmp_buf[17];
+
+/* Test if longjmp to JMPBUF would unwind the frame containing a local
+ variable at ADDRESS. */
+#define _JMPBUF_UNWINDS(_jmpbuf, _address) \
+ ((void *)(_address) < (void *)((_jmpbuf)[JB_SP]))
+#endif