PERFORCE change 29902 for review

[Peter Wemm]

http://perforce.freebsd.org/chv.cgi?CH=29902

Change 29902 by peter at peter_daintree on 2003/04/27 15:54:18

	make pipe(2) work with syscall for now.  int 0x80 preserves all
	registers except for the return values.  syscall does not.  This can
	be simplified when I make the fast_syscall handler preserve some
	scratch registers.

Affected files ...

.. //depot/projects/hammer/lib/libc/x86_64/sys/pipe.S#3 edit

Differences ...

==== //depot/projects/hammer/lib/libc/x86_64/sys/pipe.S#3 (text+ko) ====

@@ -42,9 +42,20 @@
 
 #include "SYS.h"
 
-SYSCALL(pipe)
-	movq	8(%rsp),%rcx	/* XXX wrong!! %rdi!! */
+	.weak	_pipe
+	.set	_pipe,__sys_pipe
+	.weak	pipe
+	.set	pipe,__sys_pipe
+ENTRY(__sys_pipe)
+	pushq	%rdi
+	mov	$SYS_pipe,%rax
+	KERNCALL
+	jb	1f
+	popq	%rcx
 	movq	%rax,(%rcx)
 	movq	%rdx,8(%rcx)
 	movq	$0,%rax
 	ret
+1:	
+	popq	%rdi
+	jmp	PIC_PLT(HIDENAME(cerror)