1#include <linux/linkage.h> 2#include <asm/assembler.h> 3#include "abort-macro.S" 4/* 5 * Function: v5t_early_abort 6 * 7 * Params : r2 = pt_regs 8 * : r4 = aborted context pc 9 * : r5 = aborted context psr 10 * 11 * Returns : r4 - r11, r13 preserved 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 19ENTRY(v5t_early_abort) 20 mrc p15, 0, r1, c5, c0, 0 @ get FSR 21 mrc p15, 0, r0, c6, c0, 0 @ get FAR 22 do_thumb_abort fsr=r1, pc=r4, psr=r5, tmp=r3 23 ldreq r3, [r4] @ read aborted ARM instruction 24 uaccess_disable ip @ disable user access 25 bic r1, r1, #1 << 11 @ clear bits 11 of FSR 26 teq_ldrd tmp=ip, insn=r3 @ insn was LDRD? 27 beq do_DataAbort @ yes 28 tst r3, #1 << 20 @ check write 29 orreq r1, r1, #1 << 11 30 b do_DataAbort 31