#include <linux/linkage.h> #include <asm/assembler.h> /* * Function: v7_early_abort * * Params : r2 = pt_regs * : r4 = aborted context pc * : r5 = aborted context psr * * Returns : r4 - r11, r13 preserved * * Purpose : obtain information about current aborted instruction. */ .align 5 ENTRY(v7_early_abort) mrc p15, 0, r1, c5, c0, 0 @ get FSR mrc p15, 0, r0, c6, c0, 0 @ get FAR uaccess_disable ip @ disable userspace access /* * V6 code adjusts the returned DFSR. * New designs should not need to patch up faults. */ #if defined([31mCONFIG_VERIFY_PERMISSION_FAULT[0m) /* * Detect erroneous permission failures and fix */ ldr r3, =0x40d @ On permission fault and r3, r1, r3 cmp r3, #0x0d bne do_DataAbort mcr p15, 0, r0, c7, c8, 0 @ Retranslate FAR isb mrc p15, 0, ip, c7, c4, 0 @ Read the PAR and r3, ip, #0x7b @ On translation fault cmp r3, #0x0b bne do_DataAbort bic r1, r1, #0xf @ Fix up FSR FS[5:0] and ip, ip, #0x7e orr r1, r1, ip, LSR #1 #endif b do_DataAbort ENDPROC(v7_early_abort) |