PERFORCE change 28525 for review

[Peter Wemm]

http://perforce.freebsd.org/chv.cgi?CH=28525

Change 28525 by peter at peter_daintree on 2003/04/08 09:45:53

	update cpu_switch for C calling conventions.  save/restore
	%rdi/%rsi around call to npxsave, and pass npxsave arg in %rdi.

Affected files ...

.. //depot/projects/hammer/sys/x86_64/x86_64/swtch.s#16 edit

Differences ...

==== //depot/projects/hammer/sys/x86_64/x86_64/swtch.s#16 (text+ko) ====

@@ -109,10 +109,13 @@
 	/* have we used fp, and need a save? */
 	cmpq	%rdi,PCPU(FPCURTHREAD)
 	jne	1f
+	pushq	%rdi
+	pushq	%rsi
 	addq	$PCB_SAVEFPU,%rdx		/* h/w bugs make saving complicated */
-	pushq	%rdx
+	movq	%rdx, %rdi
 	call	npxsave				/* do it in a big C function */
-	popq	%rax
+	popq	%rsi
+	popq	%rdi
 1:
 
 	/* Save is done.  Now fire up new thread. Leave old vmspace. */