arch/powerpc/kernel/ppc_save_regs.S

   1 /*
   2  * Copyright (C) 1996 Paul Mackerras.
   3  *
   4  *      This program is free software; you can redistribute it and/or
   5  *      modify it under the terms of the GNU General Public License
   6  *      as published by the Free Software Foundation; either version
   7  *      2 of the License, or (at your option) any later version.
   8  *
   9  * NOTE: assert(sizeof(buf) > 23 * sizeof(long))
  10  */
  11 #include <asm/processor.h>
  12 #include <asm/ppc_asm.h>
  13 #include <asm/asm-offsets.h>
  14 #include <asm/ptrace.h>
  15 #include <asm/asm-compat.h>
  16
  17 /*
  18  * Grab the register values as they are now.
  19  * This won't do a particularly good job because we really
  20  * want our caller's caller's registers, and our caller has
  21  * already executed its prologue.
  22  * ToDo: We could reach back into the caller's save area to do
  23  * a better job of representing the caller's state (note that
  24  * that will be different for 32-bit and 64-bit, because of the
  25  * different ABIs, though).
  26  */
  27 _GLOBAL(ppc_save_regs)
  28         PPC_STL r0,0*SZL(r3)
  29 #ifdef CONFIG_PPC32
  30         stmw    r2, 2*SZL(r3)
  31 #else
  32         PPC_STL r2,2*SZL(r3)
  33         PPC_STL r3,3*SZL(r3)
  34         PPC_STL r4,4*SZL(r3)
  35         PPC_STL r5,5*SZL(r3)
  36         PPC_STL r6,6*SZL(r3)
  37         PPC_STL r7,7*SZL(r3)
  38         PPC_STL r8,8*SZL(r3)
  39         PPC_STL r9,9*SZL(r3)
  40         PPC_STL r10,10*SZL(r3)
  41         PPC_STL r11,11*SZL(r3)
  42         PPC_STL r12,12*SZL(r3)
  43         PPC_STL r13,13*SZL(r3)
  44         PPC_STL r14,14*SZL(r3)
  45         PPC_STL r15,15*SZL(r3)
  46         PPC_STL r16,16*SZL(r3)
  47         PPC_STL r17,17*SZL(r3)
  48         PPC_STL r18,18*SZL(r3)
  49         PPC_STL r19,19*SZL(r3)
  50         PPC_STL r20,20*SZL(r3)
  51         PPC_STL r21,21*SZL(r3)
  52         PPC_STL r22,22*SZL(r3)
  53         PPC_STL r23,23*SZL(r3)
  54         PPC_STL r24,24*SZL(r3)
  55         PPC_STL r25,25*SZL(r3)
  56         PPC_STL r26,26*SZL(r3)
  57         PPC_STL r27,27*SZL(r3)
  58         PPC_STL r28,28*SZL(r3)
  59         PPC_STL r29,29*SZL(r3)
  60         PPC_STL r30,30*SZL(r3)
  61         PPC_STL r31,31*SZL(r3)
  62 #endif
  63         /* go up one stack frame for SP */
  64         PPC_LL  r4,0(r1)
  65         PPC_STL r4,1*SZL(r3)
  66         /* get caller's LR */
  67         PPC_LL  r0,LRSAVE(r4)
  68         PPC_STL r0,_NIP-STACK_FRAME_OVERHEAD(r3)
  69         PPC_STL r0,_LINK-STACK_FRAME_OVERHEAD(r3)
  70         mfmsr   r0
  71         PPC_STL r0,_MSR-STACK_FRAME_OVERHEAD(r3)
  72         mfctr   r0
  73         PPC_STL r0,_CTR-STACK_FRAME_OVERHEAD(r3)
  74         mfxer   r0
  75         PPC_STL r0,_XER-STACK_FRAME_OVERHEAD(r3)
  76         mfcr    r0
  77         PPC_STL r0,_CCR-STACK_FRAME_OVERHEAD(r3)
  78         li      r0,0
  79         PPC_STL r0,_TRAP-STACK_FRAME_OVERHEAD(r3)
  80         blr