1#include <linux/linkage.h> 2#include <asm/assembler.h> 3/* 4 * Function: v7_early_abort 5 * 6 * Params : r2 = pt_regs 7 * : r4 = aborted context pc 8 * : r5 = aborted context psr 9 * 10 * Returns : r4 - r11, r13 preserved 11 * 12 * Purpose : obtain information about current aborted instruction. 13 */ 14 .align 5 15ENTRY(v7_early_abort) 16 /* 17 * The effect of data aborts on on the exclusive access monitor are 18 * UNPREDICTABLE. Do a CLREX to clear the state 19 */ 20 clrex 21 22 mrc p15, 0, r1, c5, c0, 0 @ get FSR 23 mrc p15, 0, r0, c6, c0, 0 @ get FAR 24 25 /* 26 * V6 code adjusts the returned DFSR. 27 * New designs should not need to patch up faults. 28 */ 29 30#if defined(CONFIG_VERIFY_PERMISSION_FAULT) 31 /* 32 * Detect erroneous permission failures and fix 33 */ 34 ldr r3, =0x40d @ On permission fault 35 and r3, r1, r3 36 cmp r3, #0x0d 37 bne do_DataAbort 38 39 mcr p15, 0, r0, c7, c8, 0 @ Retranslate FAR 40 isb 41 mrc p15, 0, ip, c7, c4, 0 @ Read the PAR 42 and r3, ip, #0x7b @ On translation fault 43 cmp r3, #0x0b 44 bne do_DataAbort 45 bic r1, r1, #0xf @ Fix up FSR FS[5:0] 46 and ip, ip, #0x7e 47 orr r1, r1, ip, LSR #1 48#endif 49 50 b do_DataAbort 51ENDPROC(v7_early_abort) 52