1#include <linux/linkage.h> 2#include <asm/assembler.h> 3/* 4 * Function: v7_early_abort 5 * 6 * Params : r2 = address of aborted instruction 7 * : r3 = saved SPSR 8 * 9 * Returns : r0 = address of abort 10 * : r1 = FSR, bit 11 = write 11 * : r2-r8 = corrupted 12 * : r9 = preserved 13 * : sp = pointer to registers 14 * 15 * Purpose : obtain information about current aborted instruction. 16 */ 17 .align 5 18ENTRY(v7_early_abort) 19 /* 20 * The effect of data aborts on on the exclusive access monitor are 21 * UNPREDICTABLE. Do a CLREX to clear the state 22 */ 23 clrex 24 25 mrc p15, 0, r1, c5, c0, 0 @ get FSR 26 mrc p15, 0, r0, c6, c0, 0 @ get FAR 27 28 /* 29 * V6 code adjusts the returned DFSR. 30 * New designs should not need to patch up faults. 31 */ 32 33#if defined(CONFIG_VERIFY_PERMISSION_FAULT) 34 /* 35 * Detect erroneous permission failures and fix 36 */ 37 ldr r3, =0x40d @ On permission fault 38 and r3, r1, r3 39 cmp r3, #0x0d 40 movne pc, lr 41 42 mcr p15, 0, r0, c7, c8, 0 @ Retranslate FAR 43 isb 44 mrc p15, 0, r2, c7, c4, 0 @ Read the PAR 45 and r3, r2, #0x7b @ On translation fault 46 cmp r3, #0x0b 47 movne pc, lr 48 bic r1, r1, #0xf @ Fix up FSR FS[5:0] 49 and r2, r2, #0x7e 50 orr r1, r1, r2, LSR #1 51#endif 52 53 mov pc, lr 54ENDPROC(v7_early_abort) 55