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Thomas Gleixner2874c5f2019-05-27 08:55:01 +02001/* SPDX-License-Identifier: GPL-2.0-or-later */
Stephen Rothwell127efeb2006-06-28 11:55:49 +10002/*
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 *
Stephen Rothwell127efeb2006-06-28 11:55:49 +10009 * PPC64 updates by Dave Engebretsen (engebret@us.ibm.com)
10 *
Michael Neulingc3b75bd2008-01-18 15:50:30 +110011 * setjmp/longjmp code by Paul Mackerras.
Stephen Rothwell127efeb2006-06-28 11:55:49 +100012 */
13#include <asm/ppc_asm.h>
Stephen Rothwell94b146c2007-11-28 11:13:02 +110014#include <asm/unistd.h>
Michael Neulingc3b75bd2008-01-18 15:50:30 +110015#include <asm/asm-compat.h>
16#include <asm/asm-offsets.h>
Al Viro9445aa12016-01-13 23:33:46 -050017#include <asm/export.h>
Stephen Rothwell127efeb2006-06-28 11:55:49 +100018
19 .text
20
Stephen Rothwell127efeb2006-06-28 11:55:49 +100021/*
22 * Returns (address we are running at) - (address we were linked at)
23 * for use before the text and data are mapped to KERNELBASE.
Christophe Leroy0cc377d2018-04-17 13:23:10 +020024
25 * add_reloc_offset(x) returns x + reloc_offset().
Stephen Rothwell127efeb2006-06-28 11:55:49 +100026 */
27
28_GLOBAL(reloc_offset)
Christophe Leroy0cc377d2018-04-17 13:23:10 +020029 li r3, 0
Stephen Rothwell127efeb2006-06-28 11:55:49 +100030_GLOBAL(add_reloc_offset)
31 mflr r0
32 bl 1f
331: mflr r5
Paul Mackerrase31aa452008-08-30 11:41:12 +100034 PPC_LL r4,(2f-1b)(r5)
Stephen Rothwell127efeb2006-06-28 11:55:49 +100035 subf r5,r4,r5
36 add r3,r3,r5
37 mtlr r0
38 blr
Stephen Rothwell94b146c2007-11-28 11:13:02 +110039
Paul Mackerrase31aa452008-08-30 11:41:12 +100040 .align 3
412: PPC_LONG 1b
42
Michael Neulingc3b75bd2008-01-18 15:50:30 +110043_GLOBAL(setjmp)
44 mflr r0
45 PPC_STL r0,0(r3)
46 PPC_STL r1,SZL(r3)
47 PPC_STL r2,2*SZL(r3)
Christophe Leroya1f3ae32018-04-17 19:08:18 +020048#ifdef CONFIG_PPC32
49 mfcr r12
50 stmw r12, 3*SZL(r3)
51#else
Michael Neulingc3b75bd2008-01-18 15:50:30 +110052 mfcr r0
53 PPC_STL r0,3*SZL(r3)
54 PPC_STL r13,4*SZL(r3)
55 PPC_STL r14,5*SZL(r3)
56 PPC_STL r15,6*SZL(r3)
57 PPC_STL r16,7*SZL(r3)
58 PPC_STL r17,8*SZL(r3)
59 PPC_STL r18,9*SZL(r3)
60 PPC_STL r19,10*SZL(r3)
61 PPC_STL r20,11*SZL(r3)
62 PPC_STL r21,12*SZL(r3)
63 PPC_STL r22,13*SZL(r3)
64 PPC_STL r23,14*SZL(r3)
65 PPC_STL r24,15*SZL(r3)
66 PPC_STL r25,16*SZL(r3)
67 PPC_STL r26,17*SZL(r3)
68 PPC_STL r27,18*SZL(r3)
69 PPC_STL r28,19*SZL(r3)
70 PPC_STL r29,20*SZL(r3)
71 PPC_STL r30,21*SZL(r3)
72 PPC_STL r31,22*SZL(r3)
Christophe Leroya1f3ae32018-04-17 19:08:18 +020073#endif
Michael Neulingc3b75bd2008-01-18 15:50:30 +110074 li r3,0
75 blr
76
77_GLOBAL(longjmp)
Christophe Leroya1f3ae32018-04-17 19:08:18 +020078#ifdef CONFIG_PPC32
79 lmw r12, 3*SZL(r3)
80 mtcrf 0x38, r12
81#else
Christophe Leroy24c78582018-04-17 19:08:16 +020082 PPC_LL r13,4*SZL(r3)
Michael Neulingc3b75bd2008-01-18 15:50:30 +110083 PPC_LL r14,5*SZL(r3)
84 PPC_LL r15,6*SZL(r3)
85 PPC_LL r16,7*SZL(r3)
86 PPC_LL r17,8*SZL(r3)
87 PPC_LL r18,9*SZL(r3)
88 PPC_LL r19,10*SZL(r3)
89 PPC_LL r20,11*SZL(r3)
90 PPC_LL r21,12*SZL(r3)
91 PPC_LL r22,13*SZL(r3)
92 PPC_LL r23,14*SZL(r3)
93 PPC_LL r24,15*SZL(r3)
94 PPC_LL r25,16*SZL(r3)
95 PPC_LL r26,17*SZL(r3)
96 PPC_LL r27,18*SZL(r3)
97 PPC_LL r28,19*SZL(r3)
98 PPC_LL r29,20*SZL(r3)
99 PPC_LL r30,21*SZL(r3)
100 PPC_LL r31,22*SZL(r3)
101 PPC_LL r0,3*SZL(r3)
102 mtcrf 0x38,r0
Christophe Leroya1f3ae32018-04-17 19:08:18 +0200103#endif
Michael Neulingc3b75bd2008-01-18 15:50:30 +1100104 PPC_LL r0,0(r3)
105 PPC_LL r1,SZL(r3)
106 PPC_LL r2,2*SZL(r3)
107 mtlr r0
Christophe Leroy24c78582018-04-17 19:08:16 +0200108 mr. r3, r4
109 bnelr
110 li r3, 1
Michael Neulingc3b75bd2008-01-18 15:50:30 +1100111 blr
Anton Blanchardbfe9a2c2014-10-13 19:41:38 +1100112
Michael Ellerman3d13e832020-02-20 22:51:37 +1100113_GLOBAL(current_stack_frame)
Anton Blanchardbfe9a2c2014-10-13 19:41:38 +1100114 PPC_LL r3,0(r1)
115 blr
Michael Ellerman3d13e832020-02-20 22:51:37 +1100116EXPORT_SYMBOL(current_stack_frame)