diff options
Diffstat (limited to 'arch/powerpc/kernel/ppc_save_regs.S')
| -rw-r--r-- | arch/powerpc/kernel/ppc_save_regs.S | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/ppc_save_regs.S b/arch/powerpc/kernel/ppc_save_regs.S new file mode 100644 index 000000000..a9b9c32d0 --- /dev/null +++ b/arch/powerpc/kernel/ppc_save_regs.S @@ -0,0 +1,53 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Copyright (C) 1996 Paul Mackerras. + * + * NOTE: assert(sizeof(buf) > 23 * sizeof(long)) + */ +#include <asm/processor.h> +#include <asm/ppc_asm.h> +#include <asm/asm-offsets.h> +#include <asm/ptrace.h> +#include <asm/asm-compat.h> + +/* + * Grab the register values as they are now. + * This won't do a particularly good job because we really + * want our caller's caller's registers, and our caller has + * already executed its prologue. + * ToDo: We could reach back into the caller's save area to do + * a better job of representing the caller's state (note that + * that will be different for 32-bit and 64-bit, because of the + * different ABIs, though). + */ +_GLOBAL(ppc_save_regs) + /* This allows stack frame accessor macros and offsets to be used */ + subi r3,r3,STACK_INT_FRAME_REGS + PPC_STL r0,GPR0(r3) +#ifdef CONFIG_PPC32 + stmw r2,GPR2(r3) +#else + SAVE_GPRS(2, 31, r3) + lbz r0,PACAIRQSOFTMASK(r13) + PPC_STL r0,SOFTE(r3) +#endif + /* store current SP */ + PPC_STL r1,GPR1(r3) + /* get caller's LR */ + PPC_LL r4,0(r1) + PPC_LL r0,LRSAVE(r4) + PPC_STL r0,_LINK(r3) + mflr r0 + PPC_STL r0,_NIP(r3) + mfmsr r0 + PPC_STL r0,_MSR(r3) + mfctr r0 + PPC_STL r0,_CTR(r3) + mfxer r0 + PPC_STL r0,_XER(r3) + mfcr r0 + PPC_STL r0,_CCR(r3) + li r0,0 + PPC_STL r0,_TRAP(r3) + PPC_STL r0,ORIG_GPR3(r3) + blr |