ChangeSet@1.1136.1.61  2003-12-01 12:43:59-07:00  davidm at com[helgaas]

ia64: Fix a bug in sigtramp() which corrupted ar.rnat when unwinding
        across a signal trampoline (in user space).  Reported by
        Laurent Morichetti.

arch/ia64/kernel/gate.S@1.11  2003-12-01 05:43:29-07:00  davidm at com[helgaas]

(__kernel_sigtramp): Replace usage of p8 with p1.  We must use a preserved
        predicate for the .spillsp.p directive, otherwise, the predicate
        may have been clobbered by the time the unwinder looks at it.
        Fortunately, we can just use p1 because the entire pr register
        is already saved/restored by the kernel.


--- linux-2.4.23/arch/ia64/kernel/gate.S~	Tue Dec  9 00:46:11 2003
+++ linux-2.4.23/arch/ia64/kernel/gate.S	Tue Dec  9 00:46:11 2003
@@ -88,10 +88,10 @@
 	ld8 r15=[base1]					// get address of new RBS base (or NULL)
 	cover				// push args in interrupted frame onto backing store
 	;;
-	cmp.ne p8,p0=r15,r0		// do we need to switch the rbs?
+	cmp.ne p1,p0=r15,r0		// do we need to switch rbs? (note: pr is saved by kernel)
 	mov.m r9=ar.bsp			// fetch ar.bsp
-	.spillsp.p p8, ar.rnat, RNAT_OFF+SIGCONTEXT_OFF
-(p8)	br.cond.spnt setup_rbs		// yup -> (clobbers r14, r15, and r16)
+	.spillsp.p p1, ar.rnat, RNAT_OFF+SIGCONTEXT_OFF
+(p1)	br.cond.spnt setup_rbs		// yup -> (clobbers p8, r14, r15, and r16)
 back_from_setup_rbs:
 	alloc r8=ar.pfs,0,0,3,0
 	ld8 out0=[base0],16		// load arg0 (signum)
@@ -130,8 +130,8 @@
 	ld8 r15=[base0],(CFM_OFF-BSP_OFF)	// fetch sc_ar_bsp and advance to CFM_OFF
 	mov r14=ar.bsp
 	;;
-	cmp.ne p8,p0=r14,r15			// do we need to restore the rbs?
-(p8)	br.cond.spnt restore_rbs		// yup -> (clobbers r14-r18, f6 & f7)
+	cmp.ne p1,p0=r14,r15			// do we need to restore the rbs?
+(p1)	br.cond.spnt restore_rbs		// yup -> (clobbers p8, r14-r18, f6 & f7)
 	;;
 back_from_restore_rbs:
 	adds base0=(FR6_OFF+SIGCONTEXT_OFF),sp