[linux-2.6-block.git] / arch / arm / mm / abort-ev4t.S

#include <linux/linkage.h>
#include <asm/assembler.h>
#include "abort-macro.S"
/*
 * Function: v4t_early_abort
 *
 * Params  : r2 = address of aborted instruction
 *         : r3 = saved SPSR
 *
 * Returns : r0 = address of abort
 *	   : r1 = FSR, bit 11 = write
 *	   : r2-r8 = corrupted
 *	   : r9 = preserved
 *	   : sp = pointer to registers
 *
 * 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(v4t_early_abort)
	mrc	p15, 0, r1, c5, c0, 0		@ get FSR
	mrc	p15, 0, r0, c6, c0, 0		@ get FAR
	do_thumb_abort
	ldreq	r3, [r2]			@ read aborted ARM instruction
	bic	r1, r1, #1 << 11 | 1 << 10	@ clear bits 11 and 10 of FSR
	tst	r3, #1 << 20			@ check write
	orreq	r1, r1, #1 << 11
	mov	pc, lr
Commit	Line	Data
1da177e4 LT	1	#include <linux/linkage.h>
	2	#include <asm/assembler.h>
	3	#include "abort-macro.S"
	4	/*
	5	* Function: v4t_early_abort
	6	*
	7	* Params : r2 = address of aborted instruction
	8	* : r3 = saved SPSR
	9	*
	10	* Returns : r0 = address of abort
	11	* : r1 = FSR, bit 11 = write
	12	* : r2-r8 = corrupted
	13	* : r9 = preserved
	14	* : sp = pointer to registers
	15	*
	16	* Purpose : obtain information about current aborted instruction.
	17	* Note: we read user space. This means we might cause a data
	18	* abort here if the I-TLB and D-TLB aren't seeing the same
	19	* picture. Unfortunately, this does happen. We live with it.
	20	*/
	21	.align 5
	22	ENTRY(v4t_early_abort)
	23	mrc p15, 0, r1, c5, c0, 0 @ get FSR
	24	mrc p15, 0, r0, c6, c0, 0 @ get FAR
	25	do_thumb_abort
	26	ldreq r3, [r2] @ read aborted ARM instruction
	27	bic r1, r1, #1 << 11 \| 1 << 10 @ clear bits 11 and 10 of FSR
	28	tst r3, #1 << 20 @ check write
	29	orreq r1, r1, #1 << 11
	30	mov pc, lr