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#ifdef CONFIG_CPU_V6 21 sub r1, sp, #4 @ Get unused stack location 22 strex r0, r1, [r1] @ Clear the exclusive monitor 23#elif defined(CONFIG_CPU_32v6K) 24 clrex 25#endif 26 mrc p15, 0, r1, c5, c0, 0 @ get FSR 27 mrc p15, 0, r0, c6, c0, 0 @ get FAR 28/* 29 * Faulty SWP instruction on 1136 doesn't set bit 11 in DFSR. 30 */ 31#ifdef CONFIG_ARM_ERRATA_326103 32 ldr ip, =0x4107b36 33 mrc p15, 0, r3, c0, c0, 0 @ get processor id 34 teq ip, r3, lsr #4 @ r0 ARM1136? 35 bne do_DataAbort 36 tst r5, #PSR_J_BIT @ Java? 37 tsteq r5, #PSR_T_BIT @ Thumb? 38 bne do_DataAbort 39 bic r1, r1, #1 << 11 @ clear bit 11 of FSR 40 ldr r3, [r4] @ read aborted ARM instruction 41#ifdef CONFIG_CPU_ENDIAN_BE8 42 rev r3, r3 43#endif 44 do_ldrd_abort tmp=ip, insn=r3 45 tst r3, #1 << 20 @ L = 0 -> write 46 orreq r1, r1, #1 << 11 @ yes. 47#endif 48 b do_DataAbort 49