#include <linux/linkage.h>
#include <asm/assembler.h>
/*
* Function: v7_early_abort
*
* Params : r2 = address of aborted instruction
* : r3 = saved SPSR
*
* Returns : r0 = address of abort
* : r1 = FSR, bit 11 = write
* : r2-r8 = corrupted
* : r9 = preserved
* : sp = pointer to registers
*
* Purpose : obtain information about current aborted instruction.
*/
.align 5
ENTRY(v7_early_abort)
/*
* The effect of data aborts on on the exclusive access monitor are
* UNPREDICTABLE. Do a CLREX to clear the state
*/
clrex
mrc p15, 0, r1, c5, c0, 0 @ get FSR
mrc p15, 0, r0, c6, c0, 0 @ get FAR
/*
* 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
movne pc, lr
mcr p15, 0, r0, c7, c8, 0 @ Retranslate FAR
isb
mrc p15, 0, r2, c7, c4, 0 @ Read the PAR
and r3, r2, #0x7b @ On translation fault
cmp r3, #0x0b
movne pc, lr
bic r1, r1, #0xf @ Fix up FSR FS[5:0]
and r2, r2, #0x7e
orr r1, r1, r2, LSR #1
#endif
mov pc, lr
ENDPROC(v7_early_abort)
