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From: Peter Wemm <peter@FreeBSD.org>
To: Perforce Change Reviews <perforce@freebsd.org>
Subject: PERFORCE change 29920 for review
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http://perforce.freebsd.org/chv.cgi?CH=29920

Change 29920 by peter@peter_daintree on 2003/04/27 20:13:58

	take advantage of register preservation across syscall

Affected files ...

.. //depot/projects/hammer/lib/libc/x86_64/sys/Ovfork.S#5 edit

Differences ...

==== //depot/projects/hammer/lib/libc/x86_64/sys/Ovfork.S#5 (text+ko) ====

@@ -47,12 +47,11 @@
 	.weak	vfork
 	.set	vfork,__sys_vfork
 ENTRY(__sys_vfork)
-	popq	%rcx		/* my rta into ecx */
+	popq	%rsi		/* fetch return address (%rsi preserved) */
 	mov	$SYS_vfork,%rax
-	/* cant use KERNCALL yet, no scratch regs, cant use stack */
-	int	$0x80
+	KERNCALL
 	jb	1f
-	jmp	*%rcx
+	jmp	*%rsi
 1:
 	pushq	%rcx
 	jmp     PIC_PLT(HIDENAME(cerror))