1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #include <linux/linkage.h> 3 #include <asm/assembler.h> 4 #include "abort-macro.S" 5 /* 6 * Function: v4t_early_abort 7 * 8 * Params : r2 = pt_regs 9 * : r4 = aborted context pc 10 * : r5 = aborted context psr 11 * 12 * Returns : r4 - r11, r13 preserved 13 * 14 * Purpose : obtain information about current aborted instruction. 15 * Note: we read user space. This means we might cause a data 16 * abort here if the I-TLB and D-TLB aren't seeing the same 17 * picture. Unfortunately, this does happen. We live with it. 18 */ 19 .align 5 20 ENTRY(v4t_early_abort) 21 mrc p15, 0, r1, c5, c0, 0 @ get FSR 22 mrc p15, 0, r0, c6, c0, 0 @ get FAR 23 do_thumb_abort fsr=r1, pc=r4, psr=r5, tmp=r3 24 ldreq r3, [r4] @ read aborted ARM instruction 25 bic r1, r1, #1 << 11 | 1 << 10 @ clear bits 11 and 10 of FSR 26 tst r3, #1 << 20 @ check write 27 orreq r1, r1, #1 << 11 28 b do_DataAbort