1bbe88886SCatalin Marinas#include <linux/linkage.h> 2bbe88886SCatalin Marinas#include <asm/assembler.h> 3bbe88886SCatalin Marinas/* 4bbe88886SCatalin Marinas * Function: v7_early_abort 5bbe88886SCatalin Marinas * 6da740472SRussell King * Params : r2 = pt_regs 7da740472SRussell King * : r4 = aborted context pc 83e287becSRussell King * : r5 = aborted context psr 9bbe88886SCatalin Marinas * 10da740472SRussell King * Returns : r4 - r11, r13 preserved 11bbe88886SCatalin Marinas * 12bbe88886SCatalin Marinas * Purpose : obtain information about current aborted instruction. 13bbe88886SCatalin Marinas */ 14bbe88886SCatalin Marinas .align 5 15bbe88886SCatalin MarinasENTRY(v7_early_abort) 16bbe88886SCatalin Marinas mrc p15, 0, r1, c5, c0, 0 @ get FSR 17bbe88886SCatalin Marinas mrc p15, 0, r0, c6, c0, 0 @ get FAR 18*2190fed6SRussell King uaccess_disable ip @ disable userspace access 19bbe88886SCatalin Marinas 20bbe88886SCatalin Marinas /* 21bbe88886SCatalin Marinas * V6 code adjusts the returned DFSR. 22bbe88886SCatalin Marinas * New designs should not need to patch up faults. 23bbe88886SCatalin Marinas */ 24e220ba60SDave Estes 25e220ba60SDave Estes#if defined(CONFIG_VERIFY_PERMISSION_FAULT) 26e220ba60SDave Estes /* 27e220ba60SDave Estes * Detect erroneous permission failures and fix 28e220ba60SDave Estes */ 29e220ba60SDave Estes ldr r3, =0x40d @ On permission fault 30e220ba60SDave Estes and r3, r1, r3 31e220ba60SDave Estes cmp r3, #0x0d 32da740472SRussell King bne do_DataAbort 33e220ba60SDave Estes 34e220ba60SDave Estes mcr p15, 0, r0, c7, c8, 0 @ Retranslate FAR 35e220ba60SDave Estes isb 360d147db0SRussell King mrc p15, 0, ip, c7, c4, 0 @ Read the PAR 370d147db0SRussell King and r3, ip, #0x7b @ On translation fault 38e220ba60SDave Estes cmp r3, #0x0b 39da740472SRussell King bne do_DataAbort 40e220ba60SDave Estes bic r1, r1, #0xf @ Fix up FSR FS[5:0] 410d147db0SRussell King and ip, ip, #0x7e 420d147db0SRussell King orr r1, r1, ip, LSR #1 43e220ba60SDave Estes#endif 44e220ba60SDave Estes 45da740472SRussell King b do_DataAbort 4693ed3970SCatalin MarinasENDPROC(v7_early_abort) 47