Take a shot at implementing a functional rfork_thread() for alpha. This

was not fun and I am not entirely certain of the correctness, but it seems
to work.  (in fact, side by side testing of this code vs the x86 version
turned up hidden bugs in the x86 code).

2 files changed, 66 insertions, 0 deletions

diff --git a/lib/libc/alpha/gen/Makefile.inc b/lib/libc/alpha/gen/Makefile.inc
index 4e7fb35..d316fdb 100644
--- a/lib/libc/alpha/gen/Makefile.inc
+++ b/lib/libc/alpha/gen/Makefile.inc
@@ -7,6 +7,7 @@ SRCS+=	flt_rounds.c fpgetmask.c fpgetround.c fpgetsticky.c fpsetmask.c \
 SRCS+=	sigsetjmp.S
 SRCS+=	__divqu.S __divq.S __divlu.S __divl.S
 SRCS+=	__remqu.S __remq.S __remlu.S __reml.S
+SRCS+=	rfork_thread.S
 
 CLEANFILES+=	__divqu.S __divq.S __divlu.S __divl.S
 CLEANFILES+=	__remqu.S __remq.S __remlu.S __reml.S
diff --git a/lib/libc/alpha/gen/rfork_thread.S b/lib/libc/alpha/gen/rfork_thread.S
new file mode 100644
index 0000000..ff0ed2c
--- /dev/null
+++ b/lib/libc/alpha/gen/rfork_thread.S
@@ -0,0 +1,65 @@
+/*-
+ * Copyright (c) 2000 Peter Wemm <peter@FreeBSD.org>
+ * All rights reserved.
+ *
+ * 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 THE AUTHOR OR CONTRIBUTORS 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.
+ *
+ * $FreeBSD$
+ */
+
+#include "SYS.h"
+#include <sys/syscall.h>
+/* #include <machine/pal.h> */
+
+/*
+ * This is pretty evil and based mostly on examples from other syscall
+ * stubs and code that gcc generated.   Correctness is uncertain, but it
+ * seems to work quite happily.
+ */
+LEAF(rfork_thread, 1)
+	br gp,L1			/* XXX profiling */
+L1:
+        LDGP(pv)
+	lda sp,-16(sp)
+	stq ra,0(sp)
+	mov a3,a5
+	CALLSYS_ERROR(rfork)
+        beq v0,$child
+	addl v0,zero,v0
+	ldq ra,0(sp)
+	lda sp,16(sp)
+	RET
+$child:
+	mov a1,sp
+	lda sp,-16(sp)
+	stq zero,0(sp)
+	mov a5,a0
+	mov a2,t12
+	jsr ra,(t12),0
+	ldgp gp,0(ra)
+	mov v0,a0
+#ifdef SYS_exit
+	CALLSYS_NOERROR(exit)
+#else
+	CALLSYS_NOERROR(sys_exit)
+#endif
+END(rfork_thread)