summaryrefslogtreecommitdiff
path: root/arch/s390/kernel/base.S
blob: c880ff72db44a0247f57c48450a230f682843ec1 (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
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
/*
 *  arch/s390/kernel/base.S
 *
 *    Copyright IBM Corp. 2006,2007
 *    Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>
 *		 Michael Holzheu <holzheu@de.ibm.com>
 */

#include <linux/linkage.h>
#include <asm/asm-offsets.h>
#include <asm/ptrace.h>

#ifdef CONFIG_64BIT

ENTRY(s390_base_mcck_handler)
	basr	%r13,0
0:	lg	%r15,__LC_PANIC_STACK	# load panic stack
	aghi	%r15,-STACK_FRAME_OVERHEAD
	larl	%r1,s390_base_mcck_handler_fn
	lg	%r1,0(%r1)
	ltgr	%r1,%r1
	jz	1f
	basr	%r14,%r1
1:	la	%r1,4095
	lmg	%r0,%r15,__LC_GPREGS_SAVE_AREA-4095(%r1)
	lpswe	__LC_MCK_OLD_PSW

	.section .bss
	.align 8
	.globl	s390_base_mcck_handler_fn
s390_base_mcck_handler_fn:
	.quad	0
	.previous

ENTRY(s390_base_ext_handler)
	stmg	%r0,%r15,__LC_SAVE_AREA_ASYNC
	basr	%r13,0
0:	aghi	%r15,-STACK_FRAME_OVERHEAD
	larl	%r1,s390_base_ext_handler_fn
	lg	%r1,0(%r1)
	ltgr	%r1,%r1
	jz	1f
	basr	%r14,%r1
1:	lmg	%r0,%r15,__LC_SAVE_AREA_ASYNC
	ni	__LC_EXT_OLD_PSW+1,0xfd	# clear wait state bit
	lpswe	__LC_EXT_OLD_PSW

	.section .bss
	.align 8
	.globl s390_base_ext_handler_fn
s390_base_ext_handler_fn:
	.quad	0
	.previous

ENTRY(s390_base_pgm_handler)
	stmg	%r0,%r15,__LC_SAVE_AREA_SYNC
	basr	%r13,0
0:	aghi	%r15,-STACK_FRAME_OVERHEAD
	larl	%r1,s390_base_pgm_handler_fn
	lg	%r1,0(%r1)
	ltgr	%r1,%r1
	jz	1f
	basr	%r14,%r1
	lmg	%r0,%r15,__LC_SAVE_AREA_SYNC
	lpswe	__LC_PGM_OLD_PSW
1:	lpswe	disabled_wait_psw-0b(%r13)

	.align	8
disabled_wait_psw:
	.quad	0x0002000180000000,0x0000000000000000 + s390_base_pgm_handler

	.section .bss
	.align 8
	.globl s390_base_pgm_handler_fn
s390_base_pgm_handler_fn:
	.quad	0
	.previous

#
# Calls diag 308 subcode 1 and continues execution
#
# The following conditions must be ensured before calling this function:
# * Prefix register = 0
# * Lowcore protection is disabled
#
ENTRY(diag308_reset)
	larl	%r4,.Lctlregs		# Save control registers
	stctg	%c0,%c15,0(%r4)
	larl	%r4,.Lfpctl		# Floating point control register
	stfpc	0(%r4)
	larl	%r4,.Lcontinue_psw	# Save PSW flags
	epsw	%r2,%r3
	stm	%r2,%r3,0(%r4)
	larl	%r4,.Lrestart_psw	# Setup restart PSW at absolute 0
	lghi	%r3,0
	lg	%r4,0(%r4)		# Save PSW
	sturg	%r4,%r3			# Use sturg, because of large pages
	lghi	%r1,1
	diag	%r1,%r1,0x308
.Lrestart_part2:
	lhi	%r0,0			# Load r0 with zero
	lhi	%r1,2			# Use mode 2 = ESAME (dump)
	sigp	%r1,%r0,0x12		# Switch to ESAME mode
	sam64				# Switch to 64 bit addressing mode
	larl	%r4,.Lctlregs		# Restore control registers
	lctlg	%c0,%c15,0(%r4)
	larl	%r4,.Lfpctl		# Restore floating point ctl register
	lfpc	0(%r4)
	larl	%r4,.Lcontinue_psw	# Restore PSW flags
	lpswe	0(%r4)
.Lcontinue:
	br	%r14
.align 16
.Lrestart_psw:
	.long	0x00080000,0x80000000 + .Lrestart_part2

	.section .data..nosave,"aw",@progbits
.align 8
.Lcontinue_psw:
	.quad	0,.Lcontinue
	.previous

	.section .bss
.align 8
.Lctlregs:
	.rept	16
	.quad	0
	.endr
.Lfpctl:
	.long	0
	.previous

#else /* CONFIG_64BIT */

ENTRY(s390_base_mcck_handler)
	basr	%r13,0
0:	l	%r15,__LC_PANIC_STACK	# load panic stack
	ahi	%r15,-STACK_FRAME_OVERHEAD
	l	%r1,2f-0b(%r13)
	l	%r1,0(%r1)
	ltr	%r1,%r1
	jz	1f
	basr	%r14,%r1
1:	lm	%r0,%r15,__LC_GPREGS_SAVE_AREA
	lpsw	__LC_MCK_OLD_PSW

2:	.long	s390_base_mcck_handler_fn

	.section .bss
	.align 4
	.globl	s390_base_mcck_handler_fn
s390_base_mcck_handler_fn:
	.long	0
	.previous

ENTRY(s390_base_ext_handler)
	stm	%r0,%r15,__LC_SAVE_AREA_ASYNC
	basr	%r13,0
0:	ahi	%r15,-STACK_FRAME_OVERHEAD
	l	%r1,2f-0b(%r13)
	l	%r1,0(%r1)
	ltr	%r1,%r1
	jz	1f
	basr	%r14,%r1
1:	lm	%r0,%r15,__LC_SAVE_AREA_ASYNC
	ni	__LC_EXT_OLD_PSW+1,0xfd	# clear wait state bit
	lpsw	__LC_EXT_OLD_PSW

2:	.long	s390_base_ext_handler_fn

	.section .bss
	.align 4
	.globl	s390_base_ext_handler_fn
s390_base_ext_handler_fn:
	.long	0
	.previous

ENTRY(s390_base_pgm_handler)
	stm	%r0,%r15,__LC_SAVE_AREA_SYNC
	basr	%r13,0
0:	ahi	%r15,-STACK_FRAME_OVERHEAD
	l	%r1,2f-0b(%r13)
	l	%r1,0(%r1)
	ltr	%r1,%r1
	jz	1f
	basr	%r14,%r1
	lm	%r0,%r15,__LC_SAVE_AREA_SYNC
	lpsw	__LC_PGM_OLD_PSW

1:	lpsw	disabled_wait_psw-0b(%r13)

2:	.long	s390_base_pgm_handler_fn

disabled_wait_psw:
	.align	8
	.long	0x000a0000,0x00000000 + s390_base_pgm_handler

	.section .bss
	.align 4
	.globl	s390_base_pgm_handler_fn
s390_base_pgm_handler_fn:
	.long	0
	.previous

#endif /* CONFIG_64BIT */