PERFORCE change 28476 for review

[Peter Wemm]

http://perforce.freebsd.org/chv.cgi?CH=28476

Change 28476 by peter at peter_daintree on 2003/04/07 19:53:11

	Make sure we dont blow up in cpu_switch() for unknown reasons.
	Blow up for known reasons instead.

Affected files ...

.. //depot/projects/hammer/sys/x86_64/x86_64/swtch.s#14 edit

Differences ...

==== //depot/projects/hammer/sys/x86_64/x86_64/swtch.s#14 (text+ko) ====

@@ -59,6 +59,10 @@
  * 16(%rsp) = newtd
  */
 ENTRY(cpu_throw)
+	movq	$nothrow, %rdi
+	call	serial_puts
+	movq	$nothrow, %rdi
+	call	panic
 	xorq	%rsi, %rsi
 	movl	PCPU(CPUID), %esi
 	movq	8(%rsp),%rcx			/* Old thread */
@@ -90,6 +94,11 @@
  */
 ENTRY(cpu_switch)
 
+	movq	$noswitch, %rdi
+	call	serial_puts
+	movq	$noswitch, %rdi
+	call	panic
+
 	/* Switch to new thread.  First, save context. */
 	movq	8(%rsp),%rcx
 
@@ -232,6 +241,8 @@
 sw0_3:	.asciz	"cpu_switch: no newthread supplied"
 #endif
 
+noswitch:	.asciz	"cpu_switch: called!"
+nothrow:	.asciz	"cpu_throw: called!"
 /*
  * savectx(pcb)
  * Update pcb, saving current processor state.