patch-2.1.30 linux/arch/sparc64/kernel/rtrap.S

• Lines: 97
• Date: Thu Mar 20 16:43:32 1997
• Orig file: v2.1.29/linux/arch/sparc64/kernel/rtrap.S
• Orig date: Mon Mar 17 14:54:23 1997

diff -u --recursive --new-file v2.1.29/linux/arch/sparc64/kernel/rtrap.S linux/arch/sparc64/kernel/rtrap.S
@@ -1,7 +1,7 @@
-/* $Id: rtrap.S,v 1.2 1997/02/26 11:09:25 jj Exp $
- * rtrap.S: Preparing for entry into the kernel on Sparc V9.
+/* $Id: rtrap.S,v 1.4 1997/03/13 16:24:55 jj Exp $
+ * rtrap.S: Preparing for return from trap on Sparc V9.
  *
- * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
+ * Copyright (C) 1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
  */
 
 #include <asm/pstate.h>
@@ -11,4 +11,84 @@
 	.align	4
 	.globl	rtrap
 rtrap:
-	/*not*/ done /*yet*/
+	sethi	%hi(intr_count), %l0
+	or	%l0, %lo(intr_count), %l0
+	ld	[%l0 + %g4], %l1
+	sethi	%hi(bh_active), %l2
+	brz,pt	%l1, 2f
+	 or	%l2, %lo(bh_active), %l2
+	sethi	%hi(bh_mask), %l1
+	or	%l1, %lo(bh_mask), %l1
+1:
+	ldx	[%l2 + %g4], %l3
+	ldx	[%l1 + %g4], %l4
+	andcc	%l3, %l4, %g0
+	be,pt	%xcc, 2f
+	 mov	1, %l7
+	call	do_bottom_half
+	 st	%l7, [%l0 + %g4]
+	ba,pt	%xcc, 1b
+	 st	%g0, [%l0 + %g4]	
+2:
+	ldx	[%sp + STACK_BIAS + REGWIN_SZ + PT_TSTATE], %l1
+	ldx	[%sp + STACK_BIAS + REGWIN_SZ + PT_TPC], %l2
+	andcc	%l1, TSTATE_PRIV, %l3
+	rdpr	%pstate, %l7
+	be,pt	%icc, to_user
+	 andn	%l7, PSTATE_IE, %l7
+3:
+	ldx	[%sp + STACK_BIAS + REGWIN_SZ + PT_G1], %g1
+	ldx	[%sp + STACK_BIAS + REGWIN_SZ + PT_G2], %g2
+	ldx	[%sp + STACK_BIAS + REGWIN_SZ + PT_G3], %g3
+	ldx	[%sp + STACK_BIAS + REGWIN_SZ + PT_G4], %g4
+	ldx	[%sp + STACK_BIAS + REGWIN_SZ + PT_G5], %g5
+	ldx	[%sp + STACK_BIAS + REGWIN_SZ + PT_G6], %g6
+	ldx	[%sp + STACK_BIAS + REGWIN_SZ + PT_G7], %g7
+	ldx	[%sp + STACK_BIAS + REGWIN_SZ + PT_I0], %i0
+	ldx	[%sp + STACK_BIAS + REGWIN_SZ + PT_I1], %i1
+	ldx	[%sp + STACK_BIAS + REGWIN_SZ + PT_I2], %i2
+	ldx	[%sp + STACK_BIAS + REGWIN_SZ + PT_I3], %i3
+	ldx	[%sp + STACK_BIAS + REGWIN_SZ + PT_I4], %i4
+	ldx	[%sp + STACK_BIAS + REGWIN_SZ + PT_I5], %i5
+	ldx	[%sp + STACK_BIAS + REGWIN_SZ + PT_I6], %i6
+	ldx	[%sp + STACK_BIAS + REGWIN_SZ + PT_I7], %i7
+	ldx	[%sp + STACK_BIAS + REGWIN_SZ + PT_Y], %o3
+	ldx	[%sp + STACK_BIAS + REGWIN_SZ + PT_TNPC], %o2
+	wr	%o3, %g0, %y
+	wrpr	%l7, %g0, %pstate
+	wrpr	%g0, 1, %tl
+	wrpr	%l1, %g0, %tstate
+	wrpr	%l2, %g0, %tpc
+	brnz,pn	%l3, 1f
+	 wrpr	%o2, %g0, %tnpc
+	/* we came here from to_user, ie. we have now AG */
+	restore
+	rdpr	%wstate, %g1
+	rdpr	%otherwin, %g2
+	srl	%g1, 3, %g1
+	wrpr	%g2, %g0, %canrestore
+	wrpr	%g1, %g0, %wstate
+	wrpr	%g0, %g0, %otherwin
+	retry
+1:
+	restore
+	retry
+to_user:
+	sethi	%hi(need_resched), %l0
+	or	%l0, %lo(need_resched), %l0
+	ld	[%l0 + %g4], %l0
+	wrpr	%o4, PSTATE_IE, %pstate
+	brz,pt	%l0, 1f
+	 ldx	[%g6 + AOFF_task_signal], %l0
+	call	schedule
+	 nop
+1:
+	ldx	[%g6 + AOFF_task_blocked], %o0
+	or	%l7, PSTATE_AG, %l7		! Will need this for setting back wstate
+	andcc	%l0, %o0, %g0
+	be,pt	%xcc, 3b
+	 mov	%l5, %o2  
+	mov	%l6, %o3
+	add	%sp, STACK_BIAS + REGWIN_SZ, %o1
+	call	do_signal
+	 add	%o7, 3b-.-4, %o7