arch/powerpc/kernel/misc.S

   1 /*
   2  * This file contains miscellaneous low-level functions.
   3  *    Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
   4  *
   5  * Largely rewritten by Cort Dougan (cort@cs.nmt.edu)
   6  * and Paul Mackerras.
   7  *
   8  * Adapted for iSeries by Mike Corrigan (mikejc@us.ibm.com)
   9  * PPC64 updates by Dave Engebretsen (engebret@us.ibm.com)
  10  *
  11  * This program is free software; you can redistribute it and/or
  12  * modify it under the terms of the GNU General Public License
  13  * as published by the Free Software Foundation; either version
  14  * 2 of the License, or (at your option) any later version.
  15  */
  16 #include <asm/ppc_asm.h>
  17
  18         .text
  19
  20 /*
  21  * Returns (address we are running at) - (address we were linked at)
  22  * for use before the text and data are mapped to KERNELBASE.
  23  */
  24
  25 _GLOBAL(reloc_offset)
  26         mflr    r0
  27         bl      1f
  28 1:      mflr    r3
  29         LOAD_REG_IMMEDIATE(r4,1b)
  30         subf    r3,r4,r3
  31         mtlr    r0
  32         blr
  33
  34 /*
  35  * add_reloc_offset(x) returns x + reloc_offset().
  36  */
  37 _GLOBAL(add_reloc_offset)
  38         mflr    r0
  39         bl      1f
  40 1:      mflr    r5
  41         LOAD_REG_IMMEDIATE(r4,1b)
  42         subf    r5,r4,r5
  43         add     r3,r3,r5
  44         mtlr    r0
  45         blr