powerpc/kernel/ppc_save_regs.S

0001 /* SPDX-License-Identifier: GPL-2.0-or-later */
0002 /*
0003  * Copyright (C) 1996 Paul Mackerras.
0004  *
0005  * NOTE: assert(sizeof(buf) > 23 * sizeof(long))
0006  */
0007 #include <asm/processor.h>
0008 #include <asm/ppc_asm.h>
0009 #include <asm/asm-offsets.h>
0010 #include <asm/ptrace.h>
0011 #include <asm/asm-compat.h>
0012
0013 /*
0014  * Grab the register values as they are now.
0015  * This won't do a particularly good job because we really
0016  * want our caller's caller's registers, and our caller has
0017  * already executed its prologue.
0018  * ToDo: We could reach back into the caller's save area to do
0019  * a better job of representing the caller's state (note that
0020  * that will be different for 32-bit and 64-bit, because of the
0021  * different ABIs, though).
0022  */
0023 _GLOBAL(ppc_save_regs)
0024     PPC_STL r0,0*SZL(r3)
0025 #ifdef CONFIG_PPC32
0026     stmw    r2, 2*SZL(r3)
0027 #else
0028     PPC_STL r2,2*SZL(r3)
0029     PPC_STL r3,3*SZL(r3)
0030     PPC_STL r4,4*SZL(r3)
0031     PPC_STL r5,5*SZL(r3)
0032     PPC_STL r6,6*SZL(r3)
0033     PPC_STL r7,7*SZL(r3)
0034     PPC_STL r8,8*SZL(r3)
0035     PPC_STL r9,9*SZL(r3)
0036     PPC_STL r10,10*SZL(r3)
0037     PPC_STL r11,11*SZL(r3)
0038     PPC_STL r12,12*SZL(r3)
0039     PPC_STL r13,13*SZL(r3)
0040     PPC_STL r14,14*SZL(r3)
0041     PPC_STL r15,15*SZL(r3)
0042     PPC_STL r16,16*SZL(r3)
0043     PPC_STL r17,17*SZL(r3)
0044     PPC_STL r18,18*SZL(r3)
0045     PPC_STL r19,19*SZL(r3)
0046     PPC_STL r20,20*SZL(r3)
0047     PPC_STL r21,21*SZL(r3)
0048     PPC_STL r22,22*SZL(r3)
0049     PPC_STL r23,23*SZL(r3)
0050     PPC_STL r24,24*SZL(r3)
0051     PPC_STL r25,25*SZL(r3)
0052     PPC_STL r26,26*SZL(r3)
0053     PPC_STL r27,27*SZL(r3)
0054     PPC_STL r28,28*SZL(r3)
0055     PPC_STL r29,29*SZL(r3)
0056     PPC_STL r30,30*SZL(r3)
0057     PPC_STL r31,31*SZL(r3)
0058     lbz r0,PACAIRQSOFTMASK(r13)
0059     PPC_STL r0,SOFTE-STACK_FRAME_OVERHEAD(r3)
0060 #endif
0061     /* go up one stack frame for SP */
0062     PPC_LL  r4,0(r1)
0063     PPC_STL r4,1*SZL(r3)
0064     /* get caller's LR */
0065     PPC_LL  r0,LRSAVE(r4)
0066     PPC_STL r0,_LINK-STACK_FRAME_OVERHEAD(r3)
0067     mflr    r0
0068     PPC_STL r0,_NIP-STACK_FRAME_OVERHEAD(r3)
0069     mfmsr   r0
0070     PPC_STL r0,_MSR-STACK_FRAME_OVERHEAD(r3)
0071     mfctr   r0
0072     PPC_STL r0,_CTR-STACK_FRAME_OVERHEAD(r3)
0073     mfxer   r0
0074     PPC_STL r0,_XER-STACK_FRAME_OVERHEAD(r3)
0075     mfcr    r0
0076     PPC_STL r0,_CCR-STACK_FRAME_OVERHEAD(r3)
0077     li  r0,0
0078     PPC_STL r0,_TRAP-STACK_FRAME_OVERHEAD(r3)
0079     PPC_STL r0,ORIG_GPR3-STACK_FRAME_OVERHEAD(r3)
0080     blr