summaryrefslogtreecommitdiffstats
path: root/arch/powerpc/kernel/misc.S
blob: b485a87c94e13b624fb2ab969e753679977ae4f9 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
/*
 * This file contains miscellaneous low-level functions.
 *    Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
 *
 * Largely rewritten by Cort Dougan (cort@cs.nmt.edu)
 * and Paul Mackerras.
 *
 * Adapted for iSeries by Mike Corrigan (mikejc@us.ibm.com)
 * PPC64 updates by Dave Engebretsen (engebret@us.ibm.com)
 *
 * setjmp/longjmp code by Paul Mackerras.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 */
#include <asm/ppc_asm.h>
#include <asm/unistd.h>
#include <asm/asm-compat.h>
#include <asm/asm-offsets.h>

	.text

/*
 * Returns (address we are running at) - (address we were linked at)
 * for use before the text and data are mapped to KERNELBASE.
 */

_GLOBAL(reloc_offset)
	mflr	r0
	bl	1f
1:	mflr	r3
	PPC_LL	r4,(2f-1b)(r3)
	subf	r3,r4,r3
	mtlr	r0
	blr

	.align	3
2:	PPC_LONG 1b

/*
 * add_reloc_offset(x) returns x + reloc_offset().
 */
_GLOBAL(add_reloc_offset)
	mflr	r0
	bl	1f
1:	mflr	r5
	PPC_LL	r4,(2f-1b)(r5)
	subf	r5,r4,r5
	add	r3,r3,r5
	mtlr	r0
	blr

	.align	3
2:	PPC_LONG 1b

_GLOBAL(kernel_execve)
	li	r0,__NR_execve
	sc
	bnslr
	neg	r3,r3
	blr

_GLOBAL(setjmp)
	mflr	r0
	PPC_STL	r0,0(r3)
	PPC_STL	r1,SZL(r3)
	PPC_STL	r2,2*SZL(r3)
	mfcr	r0
	PPC_STL	r0,3*SZL(r3)
	PPC_STL	r13,4*SZL(r3)
	PPC_STL	r14,5*SZL(r3)
	PPC_STL	r15,6*SZL(r3)
	PPC_STL	r16,7*SZL(r3)
	PPC_STL	r17,8*SZL(r3)
	PPC_STL	r18,9*SZL(r3)
	PPC_STL	r19,10*SZL(r3)
	PPC_STL	r20,11*SZL(r3)
	PPC_STL	r21,12*SZL(r3)
	PPC_STL	r22,13*SZL(r3)
	PPC_STL	r23,14*SZL(r3)
	PPC_STL	r24,15*SZL(r3)
	PPC_STL	r25,16*SZL(r3)
	PPC_STL	r26,17*SZL(r3)
	PPC_STL	r27,18*SZL(r3)
	PPC_STL	r28,19*SZL(r3)
	PPC_STL	r29,20*SZL(r3)
	PPC_STL	r30,21*SZL(r3)
	PPC_STL	r31,22*SZL(r3)
	li	r3,0
	blr

_GLOBAL(longjmp)
	PPC_LCMPI r4,0
	bne	1f
	li	r4,1
1:	PPC_LL	r13,4*SZL(r3)
	PPC_LL	r14,5*SZL(r3)
	PPC_LL	r15,6*SZL(r3)
	PPC_LL	r16,7*SZL(r3)
	PPC_LL	r17,8*SZL(r3)
	PPC_LL	r18,9*SZL(r3)
	PPC_LL	r19,10*SZL(r3)
	PPC_LL	r20,11*SZL(r3)
	PPC_LL	r21,12*SZL(r3)
	PPC_LL	r22,13*SZL(r3)
	PPC_LL	r23,14*SZL(r3)
	PPC_LL	r24,15*SZL(r3)
	PPC_LL	r25,16*SZL(r3)
	PPC_LL	r26,17*SZL(r3)
	PPC_LL	r27,18*SZL(r3)
	PPC_LL	r28,19*SZL(r3)
	PPC_LL	r29,20*SZL(r3)
	PPC_LL	r30,21*SZL(r3)
	PPC_LL	r31,22*SZL(r3)
	PPC_LL	r0,3*SZL(r3)
	mtcrf	0x38,r0
	PPC_LL	r0,0(r3)
	PPC_LL	r1,SZL(r3)
	PPC_LL	r2,2*SZL(r3)
	mtlr	r0
	mr	r3,r4
	blr

_GLOBAL(__setup_cpu_power7)
_GLOBAL(__restore_cpu_power7)
	/* place holder */
	blr

#ifdef CONFIG_EVENT_TRACING
/*
 * Get a minimal set of registers for our caller's nth caller.
 * r3 = regs pointer, r5 = n.
 *
 * We only get R1 (stack pointer), NIP (next instruction pointer)
 * and LR (link register).  These are all we can get in the
 * general case without doing complicated stack unwinding, but
 * fortunately they are enough to do a stack backtrace, which
 * is all we need them for.
 */
_GLOBAL(perf_arch_fetch_caller_regs)
	mr	r6,r1
	cmpwi	r5,0
	mflr	r4
	ble	2f
	mtctr	r5
1:	PPC_LL	r6,0(r6)
	bdnz	1b
	PPC_LL	r4,PPC_LR_STKOFF(r6)
2:	PPC_LL	r7,0(r6)
	PPC_LL	r7,PPC_LR_STKOFF(r7)
	PPC_STL	r6,GPR1-STACK_FRAME_OVERHEAD(r3)
	PPC_STL	r4,_NIP-STACK_FRAME_OVERHEAD(r3)
	PPC_STL	r7,_LINK-STACK_FRAME_OVERHEAD(r3)
	blr
#endif /* CONFIG_EVENT_TRACING */
OpenPOWER on IntegriCloud