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1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * arch/s390/kernel/base.S
4 *
5 * Copyright IBM Corp. 2006, 2007
6 * Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>
7 * Michael Holzheu <holzheu@de.ibm.com>
8 */
9
10#include <linux/linkage.h>
11#include <asm/asm-offsets.h>
12#include <asm/nospec-insn.h>
13#include <asm/ptrace.h>
14#include <asm/sigp.h>
15
16 GEN_BR_THUNK %r9
17 GEN_BR_THUNK %r14
18
19ENTRY(s390_base_mcck_handler)
20 basr %r13,0
210: lg %r15,__LC_PANIC_STACK # load panic stack
22 aghi %r15,-STACK_FRAME_OVERHEAD
23 larl %r1,s390_base_mcck_handler_fn
24 lg %r9,0(%r1)
25 ltgr %r9,%r9
26 jz 1f
27 BASR_EX %r14,%r9
281: la %r1,4095
29 lmg %r0,%r15,__LC_GPREGS_SAVE_AREA-4095(%r1)
30 lpswe __LC_MCK_OLD_PSW
31
32 .section .bss
33 .align 8
34 .globl s390_base_mcck_handler_fn
35s390_base_mcck_handler_fn:
36 .quad 0
37 .previous
38
39ENTRY(s390_base_ext_handler)
40 stmg %r0,%r15,__LC_SAVE_AREA_ASYNC
41 basr %r13,0
420: aghi %r15,-STACK_FRAME_OVERHEAD
43 larl %r1,s390_base_ext_handler_fn
44 lg %r9,0(%r1)
45 ltgr %r9,%r9
46 jz 1f
47 BASR_EX %r14,%r9
481: lmg %r0,%r15,__LC_SAVE_AREA_ASYNC
49 ni __LC_EXT_OLD_PSW+1,0xfd # clear wait state bit
50 lpswe __LC_EXT_OLD_PSW
51
52 .section .bss
53 .align 8
54 .globl s390_base_ext_handler_fn
55s390_base_ext_handler_fn:
56 .quad 0
57 .previous
58
59ENTRY(s390_base_pgm_handler)
60 stmg %r0,%r15,__LC_SAVE_AREA_SYNC
61 basr %r13,0
620: aghi %r15,-STACK_FRAME_OVERHEAD
63 larl %r1,s390_base_pgm_handler_fn
64 lg %r9,0(%r1)
65 ltgr %r9,%r9
66 jz 1f
67 BASR_EX %r14,%r9
68 lmg %r0,%r15,__LC_SAVE_AREA_SYNC
69 lpswe __LC_PGM_OLD_PSW
701: lpswe disabled_wait_psw-0b(%r13)
71
72 .align 8
73disabled_wait_psw:
74 .quad 0x0002000180000000,0x0000000000000000 + s390_base_pgm_handler
75
76 .section .bss
77 .align 8
78 .globl s390_base_pgm_handler_fn
79s390_base_pgm_handler_fn:
80 .quad 0
81 .previous
82
83#
84# Calls diag 308 subcode 1 and continues execution
85#
86ENTRY(diag308_reset)
87 larl %r4,.Lctlregs # Save control registers
88 stctg %c0,%c15,0(%r4)
89 lg %r2,0(%r4) # Disable lowcore protection
90 nilh %r2,0xefff
91 larl %r4,.Lctlreg0
92 stg %r2,0(%r4)
93 lctlg %c0,%c0,0(%r4)
94 larl %r4,.Lfpctl # Floating point control register
95 stfpc 0(%r4)
96 larl %r4,.Lprefix # Save prefix register
97 stpx 0(%r4)
98 larl %r4,.Lprefix_zero # Set prefix register to 0
99 spx 0(%r4)
100 larl %r4,.Lcontinue_psw # Save PSW flags
101 epsw %r2,%r3
102 stm %r2,%r3,0(%r4)
103 larl %r4,.Lrestart_psw # Setup restart PSW at absolute 0
104 lghi %r3,0
105 lg %r4,0(%r4) # Save PSW
106 sturg %r4,%r3 # Use sturg, because of large pages
107 lghi %r1,1
108 lghi %r0,0
109 diag %r0,%r1,0x308
110.Lrestart_part2:
111 lhi %r0,0 # Load r0 with zero
112 lhi %r1,2 # Use mode 2 = ESAME (dump)
113 sigp %r1,%r0,SIGP_SET_ARCHITECTURE # Switch to ESAME mode
114 sam64 # Switch to 64 bit addressing mode
115 larl %r4,.Lctlregs # Restore control registers
116 lctlg %c0,%c15,0(%r4)
117 larl %r4,.Lfpctl # Restore floating point ctl register
118 lfpc 0(%r4)
119 larl %r4,.Lprefix # Restore prefix register
120 spx 0(%r4)
121 larl %r4,.Lcontinue_psw # Restore PSW flags
122 lpswe 0(%r4)
123.Lcontinue:
124 BR_EX %r14
125.align 16
126.Lrestart_psw:
127 .long 0x00080000,0x80000000 + .Lrestart_part2
128
129 .section .data..nosave,"aw",@progbits
130.align 8
131.Lcontinue_psw:
132 .quad 0,.Lcontinue
133 .previous
134
135 .section .bss
136.align 8
137.Lctlreg0:
138 .quad 0
139.Lctlregs:
140 .rept 16
141 .quad 0
142 .endr
143.Lfpctl:
144 .long 0
145.Lprefix:
146 .long 0
147.Lprefix_zero:
148 .long 0
149 .previous
1/*
2 * arch/s390/kernel/base.S
3 *
4 * Copyright IBM Corp. 2006, 2007
5 * Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>
6 * Michael Holzheu <holzheu@de.ibm.com>
7 */
8
9#include <linux/linkage.h>
10#include <asm/asm-offsets.h>
11#include <asm/ptrace.h>
12#include <asm/sigp.h>
13
14#ifdef CONFIG_64BIT
15
16ENTRY(s390_base_mcck_handler)
17 basr %r13,0
180: lg %r15,__LC_PANIC_STACK # load panic stack
19 aghi %r15,-STACK_FRAME_OVERHEAD
20 larl %r1,s390_base_mcck_handler_fn
21 lg %r1,0(%r1)
22 ltgr %r1,%r1
23 jz 1f
24 basr %r14,%r1
251: la %r1,4095
26 lmg %r0,%r15,__LC_GPREGS_SAVE_AREA-4095(%r1)
27 lpswe __LC_MCK_OLD_PSW
28
29 .section .bss
30 .align 8
31 .globl s390_base_mcck_handler_fn
32s390_base_mcck_handler_fn:
33 .quad 0
34 .previous
35
36ENTRY(s390_base_ext_handler)
37 stmg %r0,%r15,__LC_SAVE_AREA_ASYNC
38 basr %r13,0
390: aghi %r15,-STACK_FRAME_OVERHEAD
40 larl %r1,s390_base_ext_handler_fn
41 lg %r1,0(%r1)
42 ltgr %r1,%r1
43 jz 1f
44 basr %r14,%r1
451: lmg %r0,%r15,__LC_SAVE_AREA_ASYNC
46 ni __LC_EXT_OLD_PSW+1,0xfd # clear wait state bit
47 lpswe __LC_EXT_OLD_PSW
48
49 .section .bss
50 .align 8
51 .globl s390_base_ext_handler_fn
52s390_base_ext_handler_fn:
53 .quad 0
54 .previous
55
56ENTRY(s390_base_pgm_handler)
57 stmg %r0,%r15,__LC_SAVE_AREA_SYNC
58 basr %r13,0
590: aghi %r15,-STACK_FRAME_OVERHEAD
60 larl %r1,s390_base_pgm_handler_fn
61 lg %r1,0(%r1)
62 ltgr %r1,%r1
63 jz 1f
64 basr %r14,%r1
65 lmg %r0,%r15,__LC_SAVE_AREA_SYNC
66 lpswe __LC_PGM_OLD_PSW
671: lpswe disabled_wait_psw-0b(%r13)
68
69 .align 8
70disabled_wait_psw:
71 .quad 0x0002000180000000,0x0000000000000000 + s390_base_pgm_handler
72
73 .section .bss
74 .align 8
75 .globl s390_base_pgm_handler_fn
76s390_base_pgm_handler_fn:
77 .quad 0
78 .previous
79
80#
81# Calls diag 308 subcode 1 and continues execution
82#
83# The following conditions must be ensured before calling this function:
84# * Prefix register = 0
85# * Lowcore protection is disabled
86#
87ENTRY(diag308_reset)
88 larl %r4,.Lctlregs # Save control registers
89 stctg %c0,%c15,0(%r4)
90 larl %r4,.Lfpctl # Floating point control register
91 stfpc 0(%r4)
92 larl %r4,.Lcontinue_psw # Save PSW flags
93 epsw %r2,%r3
94 stm %r2,%r3,0(%r4)
95 larl %r4,.Lrestart_psw # Setup restart PSW at absolute 0
96 lghi %r3,0
97 lg %r4,0(%r4) # Save PSW
98 sturg %r4,%r3 # Use sturg, because of large pages
99 lghi %r1,1
100 diag %r1,%r1,0x308
101.Lrestart_part2:
102 lhi %r0,0 # Load r0 with zero
103 lhi %r1,2 # Use mode 2 = ESAME (dump)
104 sigp %r1,%r0,SIGP_SET_ARCHITECTURE # Switch to ESAME mode
105 sam64 # Switch to 64 bit addressing mode
106 larl %r4,.Lctlregs # Restore control registers
107 lctlg %c0,%c15,0(%r4)
108 larl %r4,.Lfpctl # Restore floating point ctl register
109 lfpc 0(%r4)
110 larl %r4,.Lcontinue_psw # Restore PSW flags
111 lpswe 0(%r4)
112.Lcontinue:
113 br %r14
114.align 16
115.Lrestart_psw:
116 .long 0x00080000,0x80000000 + .Lrestart_part2
117
118 .section .data..nosave,"aw",@progbits
119.align 8
120.Lcontinue_psw:
121 .quad 0,.Lcontinue
122 .previous
123
124 .section .bss
125.align 8
126.Lctlregs:
127 .rept 16
128 .quad 0
129 .endr
130.Lfpctl:
131 .long 0
132 .previous
133
134#else /* CONFIG_64BIT */
135
136ENTRY(s390_base_mcck_handler)
137 basr %r13,0
1380: l %r15,__LC_PANIC_STACK # load panic stack
139 ahi %r15,-STACK_FRAME_OVERHEAD
140 l %r1,2f-0b(%r13)
141 l %r1,0(%r1)
142 ltr %r1,%r1
143 jz 1f
144 basr %r14,%r1
1451: lm %r0,%r15,__LC_GPREGS_SAVE_AREA
146 lpsw __LC_MCK_OLD_PSW
147
1482: .long s390_base_mcck_handler_fn
149
150 .section .bss
151 .align 4
152 .globl s390_base_mcck_handler_fn
153s390_base_mcck_handler_fn:
154 .long 0
155 .previous
156
157ENTRY(s390_base_ext_handler)
158 stm %r0,%r15,__LC_SAVE_AREA_ASYNC
159 basr %r13,0
1600: ahi %r15,-STACK_FRAME_OVERHEAD
161 l %r1,2f-0b(%r13)
162 l %r1,0(%r1)
163 ltr %r1,%r1
164 jz 1f
165 basr %r14,%r1
1661: lm %r0,%r15,__LC_SAVE_AREA_ASYNC
167 ni __LC_EXT_OLD_PSW+1,0xfd # clear wait state bit
168 lpsw __LC_EXT_OLD_PSW
169
1702: .long s390_base_ext_handler_fn
171
172 .section .bss
173 .align 4
174 .globl s390_base_ext_handler_fn
175s390_base_ext_handler_fn:
176 .long 0
177 .previous
178
179ENTRY(s390_base_pgm_handler)
180 stm %r0,%r15,__LC_SAVE_AREA_SYNC
181 basr %r13,0
1820: ahi %r15,-STACK_FRAME_OVERHEAD
183 l %r1,2f-0b(%r13)
184 l %r1,0(%r1)
185 ltr %r1,%r1
186 jz 1f
187 basr %r14,%r1
188 lm %r0,%r15,__LC_SAVE_AREA_SYNC
189 lpsw __LC_PGM_OLD_PSW
190
1911: lpsw disabled_wait_psw-0b(%r13)
192
1932: .long s390_base_pgm_handler_fn
194
195disabled_wait_psw:
196 .align 8
197 .long 0x000a0000,0x00000000 + s390_base_pgm_handler
198
199 .section .bss
200 .align 4
201 .globl s390_base_pgm_handler_fn
202s390_base_pgm_handler_fn:
203 .long 0
204 .previous
205
206#endif /* CONFIG_64BIT */