patch-2.4.19 linux-2.4.19/arch/arm/mm/proc-arm1020.S

• Lines: 32
• Date: Fri Aug 2 17:39:42 2002
• Orig file: linux-2.4.18/arch/arm/mm/proc-arm1020.S
• Orig date: Fri Nov 9 13:58:02 2001

diff -urN linux-2.4.18/arch/arm/mm/proc-arm1020.S linux-2.4.19/arch/arm/mm/proc-arm1020.S
@@ -56,22 +56,27 @@
  * cpu_arm1020_data_abort()
  *
  * obtain information about current aborted instruction
+ * Note: we read user space.  This means we might cause a data
+ * abort here if the I-TLB and D-TLB aren't seeing the same
+ * picture.  Unfortunately, this does happen.  We live with it.
  *
- * r0 = address of aborted instruction
+ *  r2 = address of aborted instruction
+ *  r3 = cpsr
  *
  * Returns:
  *  r0 = address of abort
  *  r1 != 0 if writing
  *  r3 = FSR
+ *  r4 = corrupted
  */
 	.align	5
 ENTRY(cpu_arm1020_data_abort)
-	ldr	r1, [r0]			@ read aborted instruction
+	mrc	p15, 0, r3, c5, c0, 0		@ get FSR
 	mrc	p15, 0, r0, c6, c0, 0		@ get FAR
+	ldr	r1, [r2]			@ read aborted instruction
+	and	r3, r3, #255
 	tst	r1, r1, lsr #21 		@ C = bit 20
-	mrc	p15, 0, r3, c5, c0, 0		@ get FSR
 	sbc	r1, r1, r1			@ r1 = C - 1
-	and	r3, r3, #255
 	mov	pc, lr
 
 /*