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 = address of aborted instruction 8 * : r3 = saved SPSR 9 * 10 * Returns : r0 = address of abort 11 * : r1 = FSR, bit 11 = write 12 * : r2-r8 = corrupted 13 * : r9 = preserved 14 * : sp = pointer to registers 15 * 16 * Purpose : obtain information about current aborted instruction. 17 * Note: we read user space. This means we might cause a data 18 * abort here if the I-TLB and D-TLB aren't seeing the same 19 * picture. Unfortunately, this does happen. We live with it. 20 */ 21 .align 5 22ENTRY(v6_early_abort) 23#ifdef CONFIG_CPU_32v6K 24 clrex 25#else 26 sub r1, sp, #4 @ Get unused stack location 27 strex r0, r1, [r1] @ Clear the exclusive monitor 28#endif 29 mrc p15, 0, r1, c5, c0, 0 @ get FSR 30 mrc p15, 0, r0, c6, c0, 0 @ get FAR 31/* 32 * Faulty SWP instruction on 1136 doesn't set bit 11 in DFSR (erratum 326103). 33 * The test below covers all the write situations, including Java bytecodes 34 */ 35 bic r1, r1, #1 << 11 @ clear bit 11 of FSR 36 tst r3, #PSR_J_BIT @ Java? 37 movne pc, lr 38 do_thumb_abort 39 ldreq r3, [r2] @ read aborted ARM instruction 40#ifdef CONFIG_CPU_ENDIAN_BE8 41 reveq r3, r3 42#endif 43 do_ldrd_abort 44 tst r3, #1 << 20 @ L = 0 -> write 45 orreq r1, r1, #1 << 11 @ yes. 46 mov pc, lr 47