arch/arm/mm/abort-ev4t.S

   1 #include <linux/linkage.h>
   2 #include <asm/assembler.h>
   3 #include "abort-macro.S"
   4 /*
   5  * Function: v4t_early_abort
   6  *
   7  * Params  : r2 = pt_regs
   8  *         : r4 = aborted context pc
   9  *         : r5 = aborted context psr
  10  *
  11  * Returns : r4 - r11, r13 preserved
  12  *
  13  * Purpose : obtain information about current aborted instruction.
  14  * Note: we read user space.  This means we might cause a data
  15  * abort here if the I-TLB and D-TLB aren't seeing the same
  16  * picture.  Unfortunately, this does happen.  We live with it.
  17  */
  18         .align  5
  19 ENTRY(v4t_early_abort)
  20         mrc     p15, 0, r1, c5, c0, 0           @ get FSR
  21         mrc     p15, 0, r0, c6, c0, 0           @ get FAR
  22         do_thumb_abort fsr=r1, pc=r4, psr=r5, tmp=r3
  23         ldreq   r3, [r4]                        @ read aborted ARM instruction
  24         bic     r1, r1, #1 << 11 | 1 << 10      @ clear bits 11 and 10 of FSR
  25         tst     r3, #1 << 20                    @ check write
  26         orreq   r1, r1, #1 << 11
  27         b       do_DataAbort