arch/arm/mm/abort-ev7.S

   1 #include <linux/linkage.h>
   2 #include <asm/assembler.h>
   3 /*
   4  * Function: v7_early_abort
   5  *
   6  * Params  : r2 = pt_regs
   7  *         : r4 = aborted context pc
   8  *         : r5 = aborted context psr
   9  *
  10  * Returns : r4 - r11, r13 preserved
  11  *
  12  * Purpose : obtain information about current aborted instruction.
  13  */
  14         .align  5
  15 ENTRY(v7_early_abort)
  16         mrc     p15, 0, r1, c5, c0, 0           @ get FSR
  17         mrc     p15, 0, r0, c6, c0, 0           @ get FAR
  18
  19         /*
  20          * V6 code adjusts the returned DFSR.
  21          * New designs should not need to patch up faults.
  22          */
  23
  24 #if defined(CONFIG_VERIFY_PERMISSION_FAULT)
  25         /*
  26          * Detect erroneous permission failures and fix
  27          */
  28         ldr     r3, =0x40d                      @ On permission fault
  29         and     r3, r1, r3
  30         cmp     r3, #0x0d
  31         bne     do_DataAbort
  32
  33         mcr     p15, 0, r0, c7, c8, 0           @ Retranslate FAR
  34         isb
  35         mrc     p15, 0, ip, c7, c4, 0           @ Read the PAR
  36         and     r3, ip, #0x7b                   @ On translation fault
  37         cmp     r3, #0x0b
  38         bne     do_DataAbort
  39         bic     r1, r1, #0xf                    @ Fix up FSR FS[5:0]
  40         and     ip, ip, #0x7e
  41         orr     r1, r1, ip, LSR #1
  42 #endif
  43
  44         b       do_DataAbort
  45 ENDPROC(v7_early_abort)