abort-ev5t.S

#include <linux/linkage.h>
#include <asm/assembler.h>
#include "abort-macro.S"
/*
 * Function: v5t_early_abort
 *
 * Params  : r4 = aborted context pc
 *	   : r5 = aborted context psr
 *
 * 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(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
	bic	r1, r1, #1 << 11		@ clear bits 11 of FSR
	do_ldrd_abort tmp=r2, insn=r3
	tst	r3, #1 << 20			@ check write
	orreq	r1, r1, #1 << 11
	mov	pc, lr