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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 <asm/ppc_asm.h>
14#include <asm/unistd.h>
15#include <asm/asm-compat.h>
16#include <asm/asm-offsets.h>
17#include <asm/export.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)
1/*
2 * This file contains miscellaneous low-level functions.
3 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
4 *
5 * Largely rewritten by Cort Dougan (cort@cs.nmt.edu)
6 * and Paul Mackerras.
7 *
8 * Adapted for iSeries by Mike Corrigan (mikejc@us.ibm.com)
9 * PPC64 updates by Dave Engebretsen (engebret@us.ibm.com)
10 *
11 * setjmp/longjmp code by Paul Mackerras.
12 *
13 * This program is free software; you can redistribute it and/or
14 * modify it under the terms of the GNU General Public License
15 * as published by the Free Software Foundation; either version
16 * 2 of the License, or (at your option) any later version.
17 */
18#include <asm/ppc_asm.h>
19#include <asm/unistd.h>
20#include <asm/asm-compat.h>
21#include <asm/asm-offsets.h>
22
23 .text
24
25/*
26 * Returns (address we are running at) - (address we were linked at)
27 * for use before the text and data are mapped to KERNELBASE.
28 */
29
30_GLOBAL(reloc_offset)
31 mflr r0
32 bl 1f
331: mflr r3
34 PPC_LL r4,(2f-1b)(r3)
35 subf r3,r4,r3
36 mtlr r0
37 blr
38
39 .align 3
402: PPC_LONG 1b
41
42/*
43 * add_reloc_offset(x) returns x + reloc_offset().
44 */
45_GLOBAL(add_reloc_offset)
46 mflr r0
47 bl 1f
481: mflr r5
49 PPC_LL r4,(2f-1b)(r5)
50 subf r5,r4,r5
51 add r3,r3,r5
52 mtlr r0
53 blr
54
55 .align 3
562: PPC_LONG 1b
57
58_GLOBAL(kernel_execve)
59 li r0,__NR_execve
60 sc
61 bnslr
62 neg r3,r3
63 blr
64
65_GLOBAL(setjmp)
66 mflr r0
67 PPC_STL r0,0(r3)
68 PPC_STL r1,SZL(r3)
69 PPC_STL r2,2*SZL(r3)
70 mfcr r0
71 PPC_STL r0,3*SZL(r3)
72 PPC_STL r13,4*SZL(r3)
73 PPC_STL r14,5*SZL(r3)
74 PPC_STL r15,6*SZL(r3)
75 PPC_STL r16,7*SZL(r3)
76 PPC_STL r17,8*SZL(r3)
77 PPC_STL r18,9*SZL(r3)
78 PPC_STL r19,10*SZL(r3)
79 PPC_STL r20,11*SZL(r3)
80 PPC_STL r21,12*SZL(r3)
81 PPC_STL r22,13*SZL(r3)
82 PPC_STL r23,14*SZL(r3)
83 PPC_STL r24,15*SZL(r3)
84 PPC_STL r25,16*SZL(r3)
85 PPC_STL r26,17*SZL(r3)
86 PPC_STL r27,18*SZL(r3)
87 PPC_STL r28,19*SZL(r3)
88 PPC_STL r29,20*SZL(r3)
89 PPC_STL r30,21*SZL(r3)
90 PPC_STL r31,22*SZL(r3)
91 li r3,0
92 blr
93
94_GLOBAL(longjmp)
95 PPC_LCMPI r4,0
96 bne 1f
97 li r4,1
981: PPC_LL r13,4*SZL(r3)
99 PPC_LL r14,5*SZL(r3)
100 PPC_LL r15,6*SZL(r3)
101 PPC_LL r16,7*SZL(r3)
102 PPC_LL r17,8*SZL(r3)
103 PPC_LL r18,9*SZL(r3)
104 PPC_LL r19,10*SZL(r3)
105 PPC_LL r20,11*SZL(r3)
106 PPC_LL r21,12*SZL(r3)
107 PPC_LL r22,13*SZL(r3)
108 PPC_LL r23,14*SZL(r3)
109 PPC_LL r24,15*SZL(r3)
110 PPC_LL r25,16*SZL(r3)
111 PPC_LL r26,17*SZL(r3)
112 PPC_LL r27,18*SZL(r3)
113 PPC_LL r28,19*SZL(r3)
114 PPC_LL r29,20*SZL(r3)
115 PPC_LL r30,21*SZL(r3)
116 PPC_LL r31,22*SZL(r3)
117 PPC_LL r0,3*SZL(r3)
118 mtcrf 0x38,r0
119 PPC_LL r0,0(r3)
120 PPC_LL r1,SZL(r3)
121 PPC_LL r2,2*SZL(r3)
122 mtlr r0
123 mr r3,r4
124 blr