1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/*
3 * This file contains miscellaneous low-level functions.
4 *    Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
5 *
6 * Largely rewritten by Cort Dougan (cort@cs.nmt.edu)
7 * and Paul Mackerras.
8 *
9 * PPC64 updates by Dave Engebretsen (engebret@us.ibm.com)
10 *
11 * setjmp/longjmp code by Paul Mackerras.
12 */
13#include <linux/export.h>
14#include <asm/ppc_asm.h>
15#include <asm/unistd.h>
16#include <asm/asm-compat.h>
17#include <asm/asm-offsets.h>
18
19	.text
20
21/*
22 * Returns (address we are running at) - (address we were linked at)
23 * for use before the text and data are mapped to KERNELBASE.
24
25 * add_reloc_offset(x) returns x + reloc_offset().
26 */
27
28_GLOBAL(reloc_offset)
29	li	r3, 0
30_GLOBAL(add_reloc_offset)
31	mflr	r0
32	bcl	20,31,$+4
331:	mflr	r5
34	PPC_LL	r4,(2f-1b)(r5)
35	subf	r5,r4,r5
36	add	r3,r3,r5
37	mtlr	r0
38	blr
39_ASM_NOKPROBE_SYMBOL(reloc_offset)
40_ASM_NOKPROBE_SYMBOL(add_reloc_offset)
41
42	.align	3
432:	PPC_LONG 1b
44
45_GLOBAL(setjmp)
46	mflr	r0
47	PPC_STL	r0,0(r3)
48	PPC_STL	r1,SZL(r3)
49	PPC_STL	r2,2*SZL(r3)
50#ifdef CONFIG_PPC32
51	mfcr	r12
52	stmw	r12, 3*SZL(r3)
53#else
54	mfcr	r0
55	PPC_STL	r0,3*SZL(r3)
56	PPC_STL	r13,4*SZL(r3)
57	PPC_STL	r14,5*SZL(r3)
58	PPC_STL	r15,6*SZL(r3)
59	PPC_STL	r16,7*SZL(r3)
60	PPC_STL	r17,8*SZL(r3)
61	PPC_STL	r18,9*SZL(r3)
62	PPC_STL	r19,10*SZL(r3)
63	PPC_STL	r20,11*SZL(r3)
64	PPC_STL	r21,12*SZL(r3)
65	PPC_STL	r22,13*SZL(r3)
66	PPC_STL	r23,14*SZL(r3)
67	PPC_STL	r24,15*SZL(r3)
68	PPC_STL	r25,16*SZL(r3)
69	PPC_STL	r26,17*SZL(r3)
70	PPC_STL	r27,18*SZL(r3)
71	PPC_STL	r28,19*SZL(r3)
72	PPC_STL	r29,20*SZL(r3)
73	PPC_STL	r30,21*SZL(r3)
74	PPC_STL	r31,22*SZL(r3)
75#endif
76	li	r3,0
77	blr
78
79_GLOBAL(longjmp)
80#ifdef CONFIG_PPC32
81	lmw	r12, 3*SZL(r3)
82	mtcrf	0x38, r12
83#else
84	PPC_LL	r13,4*SZL(r3)
85	PPC_LL	r14,5*SZL(r3)
86	PPC_LL	r15,6*SZL(r3)
87	PPC_LL	r16,7*SZL(r3)
88	PPC_LL	r17,8*SZL(r3)
89	PPC_LL	r18,9*SZL(r3)
90	PPC_LL	r19,10*SZL(r3)
91	PPC_LL	r20,11*SZL(r3)
92	PPC_LL	r21,12*SZL(r3)
93	PPC_LL	r22,13*SZL(r3)
94	PPC_LL	r23,14*SZL(r3)
95	PPC_LL	r24,15*SZL(r3)
96	PPC_LL	r25,16*SZL(r3)
97	PPC_LL	r26,17*SZL(r3)
98	PPC_LL	r27,18*SZL(r3)
99	PPC_LL	r28,19*SZL(r3)
100	PPC_LL	r29,20*SZL(r3)
101	PPC_LL	r30,21*SZL(r3)
102	PPC_LL	r31,22*SZL(r3)
103	PPC_LL	r0,3*SZL(r3)
104	mtcrf	0x38,r0
105#endif
106	PPC_LL	r0,0(r3)
107	PPC_LL	r1,SZL(r3)
108	PPC_LL	r2,2*SZL(r3)
109	mtlr	r0
110	mr.	r3, r4
111	bnelr
112	li	r3, 1
113	blr
114
115_GLOBAL(current_stack_frame)
116	PPC_LL	r3,0(r1)
117	blr
118EXPORT_SYMBOL(current_stack_frame)
119