[deliverable/linux.git] / arch / arm / mm / abort-ev4.S

#include <linux/linkage.h>
#include <asm/assembler.h>
/*
 * Function: v4_early_abort
 *
 * Params  : r2 = pt_regs
 *	   : r4 = aborted context pc
 *	   : r5 = aborted context psr
 *
 * Returns : r4 - r11, r13 preserved
 *
 * Purpose : 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.
 */
	.align	5
ENTRY(v4_early_abort)
	mrc	p15, 0, r1, c5, c0, 0		@ get FSR
	mrc	p15, 0, r0, c6, c0, 0		@ get FAR
	ldr	r3, [r4]			@ read aborted ARM instruction
	uaccess_disable ip			@ disable userspace access
	bic	r1, r1, #1 << 11 | 1 << 10	@ clear bits 11 and 10 of FSR
	tst	r3, #1 << 20			@ L = 1 -> write?
	orreq	r1, r1, #1 << 11		@ yes.
	b	do_DataAbort
Commit	Line	Data
1da177e4 LT	1	#include <linux/linkage.h>
	2	#include <asm/assembler.h>
	3	/*
	4	* Function: v4_early_abort
	5	*
da740472 RK	6	* Params : r2 = pt_regs
da740472 RK	7	* : r4 = aborted context pc
3e287bec	8	* : r5 = aborted context psr
1da177e4	9	*
da740472	10	* Returns : r4 - r11, r13 preserved
1da177e4 LT	11	*
	12	* Purpose : obtain information about current aborted instruction.
	13	* Note: we read user space. This means we might cause a data
	14	* abort here if the I-TLB and D-TLB aren't seeing the same
	15	* picture. Unfortunately, this does happen. We live with it.
	16	*/
	17	.align 5
	18	ENTRY(v4_early_abort)
	19	mrc p15, 0, r1, c5, c0, 0 @ get FSR
	20	mrc p15, 0, r0, c6, c0, 0 @ get FAR
3e287bec	21	ldr r3, [r4] @ read aborted ARM instruction
2190fed6	22	uaccess_disable ip @ disable userspace access
1da177e4 LT	23	bic r1, r1, #1 << 11 \| 1 << 10 @ clear bits 11 and 10 of FSR
	24	tst r3, #1 << 20 @ L = 1 -> write?
	25	orreq r1, r1, #1 << 11 @ yes.
da740472	26	b do_DataAbort