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authorRoland McGrath <roland@gnu.org>1995-02-18 01:27:10 +0000
committerRoland McGrath <roland@gnu.org>1995-02-18 01:27:10 +0000
commit28f540f45bbacd939bfd07f213bcad2bf730b1bf (patch)
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+/* Copyright (C) 1991, 1993 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 Library General Public License as
+published by the Free Software Foundation; either version 2 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
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with the GNU C Library; see the file COPYING.LIB. If
+not, write to the Free Software Foundation, Inc., 675 Mass Ave,
+Cambridge, MA 02139, USA. */
+
+#include <sysdep.h>
+#ifdef __svr4__
+#include <sys/trap.h>
+#else
+#include <machine/trap.h>
+#endif
+
+/* NOTE: This code depends on the definition of `__jmp_buf' in <jmp_buf.h>. */
+
+ENTRY (__longjmp)
+ /* Do a "flush register windows trap". The trap handler in the
+ kernel writes all the register windows to their stack slots, and
+ marks them all as invalid (needing to be sucked up from the
+ stack when used). This ensures that all information needed to
+ unwind to these callers is in memory, not in the register
+ windows. */
+ ta ST_FLUSH_WINDOWS
+ ld [%o0], %o7 /* Return PC. */
+ ld [%o0 + 4], %fp /* Saved SP. */
+ sub %fp, 64, %sp /* Allocate a register save area. */
+
+ /* if (%o1 == 0) %o1 = 1; */
+ tst %o1
+ be,a Ldone
+ mov 1, %o1
+
+Ldone: retl
+ /* On the way out, put the return value in %o0. */
+ restore %o1, 0, %o0