LXR linux/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 * PPC64 updates by Dave Engebretsen (engebret@us.ibm.com)
   9 *
  10 * setjmp/longjmp code by Paul Mackerras.
  11 *
  12 * This program is free software; you can redistribute it and/or
  13 * modify it under the terms of the GNU General Public License
  14 * as published by the Free Software Foundation; either version
  15 * 2 of the License, or (at your option) any later version.
  16 */
  17#include <asm/ppc_asm.h>
  18#include <asm/unistd.h>
  19#include <asm/asm-compat.h>
  20#include <asm/asm-offsets.h>
  21
  22        .text
  23
  24/*
  25 * Returns (address we are running at) - (address we were linked at)
  26 * for use before the text and data are mapped to KERNELBASE.
  27 */
  28
  29_GLOBAL(reloc_offset)
  30        mflr    r0
  31        bl      1f
  321:      mflr    r3
  33        PPC_LL  r4,(2f-1b)(r3)
  34        subf    r3,r4,r3
  35        mtlr    r0
  36        blr
  37
  38        .align  3
  392:      PPC_LONG 1b
  40
  41/*
  42 * add_reloc_offset(x) returns x + reloc_offset().
  43 */
  44_GLOBAL(add_reloc_offset)
  45        mflr    r0
  46        bl      1f
  471:      mflr    r5
  48        PPC_LL  r4,(2f-1b)(r5)
  49        subf    r5,r4,r5
  50        add     r3,r3,r5
  51        mtlr    r0
  52        blr
  53
  54        .align  3
  552:      PPC_LONG 1b
  56
  57_GLOBAL(setjmp)
  58        mflr    r0
  59        PPC_STL r0,0(r3)
  60        PPC_STL r1,SZL(r3)
  61        PPC_STL r2,2*SZL(r3)
  62        mfcr    r0
  63        PPC_STL r0,3*SZL(r3)
  64        PPC_STL r13,4*SZL(r3)
  65        PPC_STL r14,5*SZL(r3)
  66        PPC_STL r15,6*SZL(r3)
  67        PPC_STL r16,7*SZL(r3)
  68        PPC_STL r17,8*SZL(r3)
  69        PPC_STL r18,9*SZL(r3)
  70        PPC_STL r19,10*SZL(r3)
  71        PPC_STL r20,11*SZL(r3)
  72        PPC_STL r21,12*SZL(r3)
  73        PPC_STL r22,13*SZL(r3)
  74        PPC_STL r23,14*SZL(r3)
  75        PPC_STL r24,15*SZL(r3)
  76        PPC_STL r25,16*SZL(r3)
  77        PPC_STL r26,17*SZL(r3)
  78        PPC_STL r27,18*SZL(r3)
  79        PPC_STL r28,19*SZL(r3)
  80        PPC_STL r29,20*SZL(r3)
  81        PPC_STL r30,21*SZL(r3)
  82        PPC_STL r31,22*SZL(r3)
  83        li      r3,0
  84        blr
  85
  86_GLOBAL(longjmp)
  87        PPC_LCMPI r4,0
  88        bne     1f
  89        li      r4,1
  901:      PPC_LL  r13,4*SZL(r3)
  91        PPC_LL  r14,5*SZL(r3)
  92        PPC_LL  r15,6*SZL(r3)
  93        PPC_LL  r16,7*SZL(r3)
  94        PPC_LL  r17,8*SZL(r3)
  95        PPC_LL  r18,9*SZL(r3)
  96        PPC_LL  r19,10*SZL(r3)
  97        PPC_LL  r20,11*SZL(r3)
  98        PPC_LL  r21,12*SZL(r3)
  99        PPC_LL  r22,13*SZL(r3)
 100        PPC_LL  r23,14*SZL(r3)
 101        PPC_LL  r24,15*SZL(r3)
 102        PPC_LL  r25,16*SZL(r3)
 103        PPC_LL  r26,17*SZL(r3)
 104        PPC_LL  r27,18*SZL(r3)
 105        PPC_LL  r28,19*SZL(r3)
 106        PPC_LL  r29,20*SZL(r3)
 107        PPC_LL  r30,21*SZL(r3)
 108        PPC_LL  r31,22*SZL(r3)
 109        PPC_LL  r0,3*SZL(r3)
 110        mtcrf   0x38,r0
 111        PPC_LL  r0,0(r3)
 112        PPC_LL  r1,SZL(r3)
 113        PPC_LL  r2,2*SZL(r3)
 114        mtlr    r0
 115        mr      r3,r4
 116        blr
 117
 118_GLOBAL(current_stack_pointer)
 119        PPC_LL  r3,0(r1)
 120        blr
 121