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 uaccess_disable ip @ disable userspace access 19 20 /* 21 * V6 code adjusts the returned DFSR. 22 * New designs should not need to patch up faults. 23 */ 24 25#if defined(CONFIG_VERIFY_PERMISSION_FAULT) 26 /* 27 * Detect erroneous permission failures and fix 28 */ 29 ldr r3, =0x40d @ On permission fault 30 and r3, r1, r3 31 cmp r3, #0x0d 32 bne do_DataAbort 33 34 mcr p15, 0, r0, c7, c8, 0 @ Retranslate FAR 35 isb 36 mrc p15, 0, ip, c7, c4, 0 @ Read the PAR 37 and r3, ip, #0x7b @ On translation fault 38 cmp r3, #0x0b 39 bne do_DataAbort 40 bic r1, r1, #0xf @ Fix up FSR FS[5:0] 41 and ip, ip, #0x7e 42 orr r1, r1, ip, LSR #1 43#endif 44 45 b do_DataAbort 46ENDPROC(v7_early_abort) 47