arch/arm/mm/abort-ev5t.S

   1 #include <linux/linkage.h>
   2 #include <asm/assembler.h>
   3 #include "abort-macro.S"
   4 /*
   5  * Function: v5t_early_abort
   6  *
   7  * Params  : r2 = address of aborted instruction
   8  *         : r3 = saved SPSR
   9  *
  10  * Returns : r0 = address of abort
  11  *         : r1 = FSR, bit 11 = write
  12  *         : r2-r8 = corrupted
  13  *         : r9 = preserved
  14  *         : sp = pointer to registers
  15  *
  16  * Purpose : obtain information about current aborted instruction.
  17  * Note: we read user space.  This means we might cause a data
  18  * abort here if the I-TLB and D-TLB aren't seeing the same
  19  * picture.  Unfortunately, this does happen.  We live with it.
  20  */
  21         .align  5
  22 ENTRY(v5t_early_abort)
  23         mrc     p15, 0, r1, c5, c0, 0           @ get FSR
  24         mrc     p15, 0, r0, c6, c0, 0           @ get FAR
  25         do_thumb_abort
  26         ldreq   r3, [r2]                        @ read aborted ARM instruction
  27         bic     r1, r1, #1 << 11                @ clear bits 11 of FSR
  28         do_ldrd_abort
  29         tst     r3, #1 << 20                    @ check write
  30         orreq   r1, r1, #1 << 11
  31         mov     pc, lr