[mirror_ubuntu-bionic-kernel.git] / arch / arm / mm / abort-ev5t.S

#include <linux/linkage.h>
#include <asm/assembler.h>
#include "abort-macro.S"
/*
 * Function: v5t_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(v5t_early_abort)
	mrc	p15, 0, r1, c5, c0, 0		@ get FSR
	mrc	p15, 0, r0, c6, c0, 0		@ get FAR
	do_thumb_abort fsr=r1, pc=r4, psr=r5, tmp=r3
	ldreq	r3, [r4]			@ read aborted ARM instruction
	uaccess_disable ip			@ disable user access
	bic	r1, r1, #1 << 11		@ clear bits 11 of FSR
	teq_ldrd tmp=ip, insn=r3		@ insn was LDRD?
	beq	do_DataAbort			@ yes
	tst	r3, #1 << 20			@ check write
	orreq	r1, r1, #1 << 11
	b	do_DataAbort
Commit	Line	Data
1da177e4 LT	1	#include <linux/linkage.h>
	2	#include <asm/assembler.h>
	3	#include "abort-macro.S"
	4	/*
	5	* Function: v5t_early_abort
	6	*
da740472 RK	7	* Params : r2 = pt_regs
da740472 RK	8	* : r4 = aborted context pc
3e287bec	9	* : r5 = aborted context psr
1da177e4	10	*
da740472	11	* Returns : r4 - r11, r13 preserved
1da177e4 LT	12	*
	13	* Purpose : obtain information about current aborted instruction.
	14	* Note: we read user space. This means we might cause a data
	15	* abort here if the I-TLB and D-TLB aren't seeing the same
	16	* picture. Unfortunately, this does happen. We live with it.
	17	*/
	18	.align 5
	19	ENTRY(v5t_early_abort)
	20	mrc p15, 0, r1, c5, c0, 0 @ get FSR
	21	mrc p15, 0, r0, c6, c0, 0 @ get FAR
3e287bec RK	22	do_thumb_abort fsr=r1, pc=r4, psr=r5, tmp=r3
3e287bec RK	23	ldreq r3, [r4] @ read aborted ARM instruction
2190fed6	24	uaccess_disable ip @ disable user access
1da177e4	25	bic r1, r1, #1 << 11 @ clear bits 11 of FSR
08446b12 RK	26	teq_ldrd tmp=ip, insn=r3 @ insn was LDRD?
08446b12 RK	27	beq do_DataAbort @ yes
1da177e4 LT	28	tst r3, #1 << 20 @ check write
1da177e4 LT	29	orreq r1, r1, #1 << 11
da740472	30	b do_DataAbort