1#include <linux/linkage.h> 2#include <asm/assembler.h> 3#include "abort-macro.S" 4/* 5 * Function: v6_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(v6_early_abort) 20 mrc p15, 0, r1, c5, c0, 0 @ get FSR 21 mrc p15, 0, r0, c6, c0, 0 @ get FAR 22/* 23 * Faulty SWP instruction on 1136 doesn't set bit 11 in DFSR. 24 */ 25#ifdef CONFIG_ARM_ERRATA_326103 26 ldr ip, =0x4107b36 27 mrc p15, 0, r3, c0, c0, 0 @ get processor id 28 teq ip, r3, lsr #4 @ r0 ARM1136? 29 bne do_DataAbort 30 tst r5, #PSR_J_BIT @ Java? 31 tsteq r5, #PSR_T_BIT @ Thumb? 32 bne do_DataAbort 33 bic r1, r1, #1 << 11 @ clear bit 11 of FSR 34 ldr r3, [r4] @ read aborted ARM instruction 35 ARM_BE8(rev r3, r3) 36 37 do_ldrd_abort tmp=ip, insn=r3 38 tst r3, #1 << 20 @ L = 0 -> write 39 orreq r1, r1, #1 << 11 @ yes. 40#endif 41 b do_DataAbort 42