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kernel add
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#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(CONFIG_VERIFY_PERMISSION_FAULT)
/*
* 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)
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