root/arch/powerpc/kernel/ppc_save_regs.S

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 /*
   3  * Copyright (C) 1996 Paul Mackerras.
   4  *
   5  * NOTE: assert(sizeof(buf) > 23 * sizeof(long))
   6  */
   7 #include <asm/processor.h>
   8 #include <asm/ppc_asm.h>
   9 #include <asm/asm-offsets.h>
  10 #include <asm/ptrace.h>
  11 #include <asm/asm-compat.h>
  12 
  13 /*
  14  * Grab the register values as they are now.
  15  * This won't do a particularly good job because we really
  16  * want our caller's caller's registers, and our caller has
  17  * already executed its prologue.
  18  * ToDo: We could reach back into the caller's save area to do
  19  * a better job of representing the caller's state (note that
  20  * that will be different for 32-bit and 64-bit, because of the
  21  * different ABIs, though).
  22  */
  23 _GLOBAL(ppc_save_regs)
  24         PPC_STL r0,0*SZL(r3)
  25 #ifdef CONFIG_PPC32
  26         stmw    r2, 2*SZL(r3)
  27 #else
  28         PPC_STL r2,2*SZL(r3)
  29         PPC_STL r3,3*SZL(r3)
  30         PPC_STL r4,4*SZL(r3)
  31         PPC_STL r5,5*SZL(r3)
  32         PPC_STL r6,6*SZL(r3)
  33         PPC_STL r7,7*SZL(r3)
  34         PPC_STL r8,8*SZL(r3)
  35         PPC_STL r9,9*SZL(r3)
  36         PPC_STL r10,10*SZL(r3)
  37         PPC_STL r11,11*SZL(r3)
  38         PPC_STL r12,12*SZL(r3)
  39         PPC_STL r13,13*SZL(r3)
  40         PPC_STL r14,14*SZL(r3)
  41         PPC_STL r15,15*SZL(r3)
  42         PPC_STL r16,16*SZL(r3)
  43         PPC_STL r17,17*SZL(r3)
  44         PPC_STL r18,18*SZL(r3)
  45         PPC_STL r19,19*SZL(r3)
  46         PPC_STL r20,20*SZL(r3)
  47         PPC_STL r21,21*SZL(r3)
  48         PPC_STL r22,22*SZL(r3)
  49         PPC_STL r23,23*SZL(r3)
  50         PPC_STL r24,24*SZL(r3)
  51         PPC_STL r25,25*SZL(r3)
  52         PPC_STL r26,26*SZL(r3)
  53         PPC_STL r27,27*SZL(r3)
  54         PPC_STL r28,28*SZL(r3)
  55         PPC_STL r29,29*SZL(r3)
  56         PPC_STL r30,30*SZL(r3)
  57         PPC_STL r31,31*SZL(r3)
  58 #endif
  59         /* go up one stack frame for SP */
  60         PPC_LL  r4,0(r1)
  61         PPC_STL r4,1*SZL(r3)
  62         /* get caller's LR */
  63         PPC_LL  r0,LRSAVE(r4)
  64         PPC_STL r0,_NIP-STACK_FRAME_OVERHEAD(r3)
  65         PPC_STL r0,_LINK-STACK_FRAME_OVERHEAD(r3)
  66         mfmsr   r0
  67         PPC_STL r0,_MSR-STACK_FRAME_OVERHEAD(r3)
  68         mfctr   r0
  69         PPC_STL r0,_CTR-STACK_FRAME_OVERHEAD(r3)
  70         mfxer   r0
  71         PPC_STL r0,_XER-STACK_FRAME_OVERHEAD(r3)
  72         mfcr    r0
  73         PPC_STL r0,_CCR-STACK_FRAME_OVERHEAD(r3)
  74         li      r0,0
  75         PPC_STL r0,_TRAP-STACK_FRAME_OVERHEAD(r3)
  76         blr