abort-ev4.S 882 B

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  1. #include <linux/linkage.h>
  2. #include <asm/assembler.h>
  3. /*
  4. * Function: v4_early_abort
  5. *
  6. * Params : r2 = address of aborted instruction
  7. * : r3 = saved SPSR
  8. *
  9. * Returns : r0 = address of abort
  10. * : r1 = FSR, bit 11 = write
  11. * : r2-r8 = corrupted
  12. * : r9 = preserved
  13. * : sp = pointer to registers
  14. *
  15. * Purpose : obtain information about current aborted instruction.
  16. * Note: we read user space. This means we might cause a data
  17. * abort here if the I-TLB and D-TLB aren't seeing the same
  18. * picture. Unfortunately, this does happen. We live with it.
  19. */
  20. .align 5
  21. ENTRY(v4_early_abort)
  22. mrc p15, 0, r1, c5, c0, 0 @ get FSR
  23. mrc p15, 0, r0, c6, c0, 0 @ get FAR
  24. ldr r3, [r2] @ read aborted ARM instruction
  25. bic r1, r1, #1 << 11 | 1 << 10 @ clear bits 11 and 10 of FSR
  26. tst r3, #1 << 20 @ L = 1 -> write?
  27. orreq r1, r1, #1 << 11 @ yes.
  28. mov pc, lr