Add arch-x86_64/bionic.
This is basically half of I5de76f6c46ac87779f207d568a86bb453e2414de from
Pavel Chupin <pavel.v.chupin@intel.com>, but with the stock upstream
setjump/sigsetjmp and H.J. Lu's suggested changes to __rt_sigreturn.
Change-Id: I8167ec228faeb2065391e5bec0413cca662f3d33
diff --git a/libc/arch-x86_64/bionic/_setjmp.S b/libc/arch-x86_64/bionic/_setjmp.S
new file mode 100644
index 0000000..d9a59f7
--- /dev/null
+++ b/libc/arch-x86_64/bionic/_setjmp.S
@@ -0,0 +1,82 @@
+/* $OpenBSD: _setjmp.S,v 1.1 2004/01/28 01:44:45 mickey Exp $ */
+/* $NetBSD: _setjmp.S,v 1.1 2001/06/19 00:25:02 fvdl Exp $ */
+
+/*
+ * Copyright (c) 2001 Wasabi Systems, Inc.
+ * All rights reserved.
+ *
+ * Written by Frank van der Linden for Wasabi Systems, Inc.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed for the NetBSD Project by
+ * Wasabi Systems, Inc.
+ * 4. The name of Wasabi Systems, Inc. may not be used to endorse
+ * or promote products derived from this software without specific prior
+ * written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+
+#include <machine/asm.h>
+#include <machine/setjmp.h>
+
+/*
+ * C library -- _setjmp, _longjmp
+ *
+ * _longjmp(a,v)
+ * will generate a "return(v)" from the last call to
+ * _setjmp(a)
+ * by restoring registers from the stack.
+ * The previous signal state is NOT restored.
+ */
+
+ENTRY(_setjmp)
+ movq (%rsp),%r11
+ movq %rbx,(_JB_RBX * 8)(%rdi)
+ movq %rbp,(_JB_RBP * 8)(%rdi)
+ movq %r12,(_JB_R12 * 8)(%rdi)
+ movq %r13,(_JB_R13 * 8)(%rdi)
+ movq %r14,(_JB_R14 * 8)(%rdi)
+ movq %r15,(_JB_R15 * 8)(%rdi)
+ movq %rsp,(_JB_RSP * 8)(%rdi)
+ movq %r11,(_JB_PC * 8)(%rdi)
+
+ xorl %eax,%eax
+ ret
+
+ENTRY(_longjmp)
+ movq (_JB_RBX * 8)(%rdi),%rbx
+ movq (_JB_RBP * 8)(%rdi),%rbp
+ movq (_JB_R12 * 8)(%rdi),%r12
+ movq (_JB_R13 * 8)(%rdi),%r13
+ movq (_JB_R14 * 8)(%rdi),%r14
+ movq (_JB_R15 * 8)(%rdi),%r15
+ movq (_JB_RSP * 8)(%rdi),%rsp
+ movq (_JB_PC * 8)(%rdi),%r11
+
+ movl %esi,%eax
+ testl %eax,%eax
+ jnz 1f
+ incl %eax
+1: movq %r11,0(%rsp)
+ ret