#include <linux/linkage.h> #include <asm/assembler.h> #include "abort-macro.S" /* * Function: v6_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(v6_early_abort) #ifdef CONFIG_CPU_V6 sub r1, sp, #4 @ Get unused stack location strex r0, r1, [r1] @ Clear the exclusive monitor #elif defined(CONFIG_CPU_32v6K) clrex #endif mrc p15, 0, r1, c5, c0, 0 @ get FSR mrc p15, 0, r0, c6, c0, 0 @ get FAR /* * Faulty SWP instruction on 1136 doesn't set bit 11 in DFSR (erratum 326103). * The test below covers all the write situations, including Java bytecodes */ bic r1, r1, #1 << 11 @ clear bit 11 of FSR tst r3, #PSR_J_BIT @ Java? movne pc, lr do_thumb_abort ldreq r3, [r2] @ read aborted ARM instruction #ifdef CONFIG_CPU_ENDIAN_BE8 reveq r3, r3 #endif do_ldrd_abort tst r3, #1 << 20 @ L = 0 -> write orreq r1, r1, #1 << 11 @ yes. mov pc, lr