#include <linux/linkage.h> #include <asm/assembler.h> /* * Function: v4_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. * Note: we read user space. This means we might cause a data * abort here if the I-TLB and D-TLB aren't seeing the same * picture. Unfortunately, this does happen. We live with it. */ .align 5 ENTRY(v4_early_abort) mrc p15, 0, r1, c5, c0, 0 @ get FSR mrc p15, 0, r0, c6, c0, 0 @ get FAR ldr r3, [r2] @ read aborted ARM instruction bic r1, r1, #1 << 11 | 1 << 10 @ clear bits 11 and 10 of FSR tst r3, #1 << 20 @ L = 1 -> write? orreq r1, r1, #1 << 11 @ yes. mov pc, lr