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 mrc p15, 0, r1, c5, c0, 0 @ get FSR 17 mrc p15, 0, r0, c6, c0, 0 @ get FAR 18 19 /* 20 * V6 code adjusts the returned DFSR. 21 * New designs should not need to patch up faults. 22 */ 23 24#if defined(CONFIG_VERIFY_PERMISSION_FAULT) 25 /* 26 * Detect erroneous permission failures and fix 27 */ 28 ldr r3, =0x40d @ On permission fault 29 and r3, r1, r3 30 cmp r3, #0x0d 31 bne do_DataAbort 32 33 mcr p15, 0, r0, c7, c8, 0 @ Retranslate FAR 34 isb 35 mrc p15, 0, ip, c7, c4, 0 @ Read the PAR 36 and r3, ip, #0x7b @ On translation fault 37 cmp r3, #0x0b 38 bne do_DataAbort 39 bic r1, r1, #0xf @ Fix up FSR FS[5:0] 40 and ip, ip, #0x7e 41 orr r1, r1, ip, LSR #1 42#endif 43 44 b do_DataAbort 45ENDPROC(v7_early_abort) 46