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- #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)
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