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	/* This allows stack frame accessor macros and offsets to be used */
25	subi	r3,r3,STACK_INT_FRAME_REGS
26	PPC_STL	r0,GPR0(r3)
27#ifdef CONFIG_PPC32
28	stmw	r2,GPR2(r3)
29#else
30	SAVE_GPRS(2, 31, r3)
31	lbz	r0,PACAIRQSOFTMASK(r13)
32	PPC_STL	r0,SOFTE(r3)
33#endif
34	/* go up one stack frame for SP */
35	PPC_LL	r4,0(r1)
36	PPC_STL	r4,GPR1(r3)
37	/* get caller's LR */
38	PPC_LL	r0,LRSAVE(r4)
39	PPC_STL	r0,_LINK(r3)
40	mflr	r0
41	PPC_STL	r0,_NIP(r3)
42	mfmsr	r0
43	PPC_STL	r0,_MSR(r3)
44	mfctr	r0
45	PPC_STL	r0,_CTR(r3)
46	mfxer	r0
47	PPC_STL	r0,_XER(r3)
48	mfcr	r0
49	PPC_STL	r0,_CCR(r3)
50	li	r0,0
51	PPC_STL	r0,_TRAP(r3)
52	PPC_STL	r0,ORIG_GPR3(r3)
53	blr
54