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1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * Userland implementation of gettimeofday() for 32 bits processes in a
4 * s390 kernel for use in the vDSO
5 *
6 * Copyright IBM Corp. 2008
7 * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
8 */
9#include <asm/vdso.h>
10#include <asm/asm-offsets.h>
11#include <asm/unistd.h>
12#include <asm/dwarf.h>
13#include <asm/ptrace.h>
14
15 .text
16 .align 4
17 .globl __kernel_gettimeofday
18 .type __kernel_gettimeofday,@function
19__kernel_gettimeofday:
20 CFI_STARTPROC
21 ahi %r15,-16
22 CFI_ADJUST_CFA_OFFSET 16
23 CFI_VAL_OFFSET 15, -STACK_FRAME_OVERHEAD
24 basr %r5,0
250: al %r5,13f-0b(%r5) /* get &_vdso_data */
261: ltr %r3,%r3 /* check if tz is NULL */
27 je 2f
28 mvc 0(8,%r3),__VDSO_TIMEZONE(%r5)
292: ltr %r2,%r2 /* check if tv is NULL */
30 je 10f
31 l %r4,__VDSO_UPD_COUNT+4(%r5) /* load update counter */
32 tml %r4,0x0001 /* pending update ? loop */
33 jnz 1b
34 stcke 0(%r15) /* Store TOD clock */
35 lm %r0,%r1,__VDSO_TS_END(%r5) /* TOD steering end time */
36 s %r0,1(%r15)
37 sl %r1,5(%r15)
38 brc 3,14f
39 ahi %r0,-1
4014: ltr %r0,%r0 /* past end of steering? */
41 jm 16f
42 srdl %r0,15 /* 1 per 2^16 */
43 tm __VDSO_TS_DIR+3(%r5),0x01 /* steering direction? */
44 jz 15f
45 lcr %r0,%r0 /* negative TOD offset */
46 lcr %r1,%r1
47 je 15f
48 ahi %r0,-1
4915: a %r0,1(%r15) /* add TOD timestamp */
50 al %r1,5(%r15)
51 brc 12,17f
52 ahi %r0,1
53 j 17f
5416: lm %r0,%r1,1(%r15) /* load TOD timestamp */
5517: s %r0,__VDSO_XTIME_STAMP(%r5) /* TOD - cycle_last */
56 sl %r1,__VDSO_XTIME_STAMP+4(%r5)
57 brc 3,3f
58 ahi %r0,-1
593: ms %r0,__VDSO_TK_MULT(%r5) /* * tk->mult */
60 st %r0,0(%r15)
61 l %r0,__VDSO_TK_MULT(%r5)
62 ltr %r1,%r1
63 mr %r0,%r0
64 jnm 4f
65 a %r0,__VDSO_TK_MULT(%r5)
664: al %r0,0(%r15)
67 al %r0,__VDSO_XTIME_NSEC(%r5) /* + xtime */
68 al %r1,__VDSO_XTIME_NSEC+4(%r5)
69 brc 12,5f
70 ahi %r0,1
715: mvc 0(4,%r15),__VDSO_XTIME_SEC+4(%r5)
72 cl %r4,__VDSO_UPD_COUNT+4(%r5) /* check update counter */
73 jne 1b
74 l %r4,__VDSO_TK_SHIFT(%r5) /* Timekeeper shift */
75 srdl %r0,0(%r4) /* >> tk->shift */
76 l %r4,0(%r15) /* get tv_sec from stack */
77 basr %r5,0
786: ltr %r0,%r0
79 jnz 7f
80 cl %r1,11f-6b(%r5)
81 jl 8f
827: ahi %r4,1
83 sl %r1,11f-6b(%r5)
84 brc 3,6b
85 ahi %r0,-1
86 j 6b
878: st %r4,0(%r2) /* store tv->tv_sec */
88 ltr %r1,%r1
89 m %r0,12f-6b(%r5)
90 jnm 9f
91 al %r0,12f-6b(%r5)
929: srl %r0,6
93 st %r0,4(%r2) /* store tv->tv_usec */
9410: slr %r2,%r2
95 ahi %r15,16
96 CFI_ADJUST_CFA_OFFSET -16
97 CFI_RESTORE 15
98 br %r14
99 CFI_ENDPROC
10011: .long 1000000000
10112: .long 274877907
10213: .long _vdso_data - 0b
103 .size __kernel_gettimeofday,.-__kernel_gettimeofday
1/*
2 * Userland implementation of gettimeofday() for 32 bits processes in a
3 * s390 kernel for use in the vDSO
4 *
5 * Copyright IBM Corp. 2008
6 * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License (version 2 only)
10 * as published by the Free Software Foundation.
11 */
12#include <asm/vdso.h>
13#include <asm/asm-offsets.h>
14#include <asm/unistd.h>
15
16 .text
17 .align 4
18 .globl __kernel_gettimeofday
19 .type __kernel_gettimeofday,@function
20__kernel_gettimeofday:
21 .cfi_startproc
22 ahi %r15,-16
23 basr %r5,0
240: al %r5,13f-0b(%r5) /* get &_vdso_data */
251: ltr %r3,%r3 /* check if tz is NULL */
26 je 2f
27 mvc 0(8,%r3),__VDSO_TIMEZONE(%r5)
282: ltr %r2,%r2 /* check if tv is NULL */
29 je 10f
30 l %r4,__VDSO_UPD_COUNT+4(%r5) /* load update counter */
31 tml %r4,0x0001 /* pending update ? loop */
32 jnz 1b
33 stcke 0(%r15) /* Store TOD clock */
34 lm %r0,%r1,__VDSO_TS_END(%r5) /* TOD steering end time */
35 s %r0,1(%r15)
36 sl %r1,5(%r15)
37 brc 3,14f
38 ahi %r0,-1
3914: ltr %r0,%r0 /* past end of steering? */
40 jm 16f
41 srdl %r0,15 /* 1 per 2^16 */
42 tm __VDSO_TS_DIR+3(%r5),0x01 /* steering direction? */
43 jz 15f
44 lcr %r0,%r0 /* negative TOD offset */
45 lcr %r1,%r1
46 je 15f
47 ahi %r0,-1
4815: a %r0,1(%r15) /* add TOD timestamp */
49 al %r1,5(%r15)
50 brc 12,17f
51 ahi %r0,1
52 j 17f
5316: lm %r0,%r1,1(%r15) /* load TOD timestamp */
5417: s %r0,__VDSO_XTIME_STAMP(%r5) /* TOD - cycle_last */
55 sl %r1,__VDSO_XTIME_STAMP+4(%r5)
56 brc 3,3f
57 ahi %r0,-1
583: ms %r0,__VDSO_TK_MULT(%r5) /* * tk->mult */
59 st %r0,0(%r15)
60 l %r0,__VDSO_TK_MULT(%r5)
61 ltr %r1,%r1
62 mr %r0,%r0
63 jnm 4f
64 a %r0,__VDSO_TK_MULT(%r5)
654: al %r0,0(%r15)
66 al %r0,__VDSO_XTIME_NSEC(%r5) /* + xtime */
67 al %r1,__VDSO_XTIME_NSEC+4(%r5)
68 brc 12,5f
69 ahi %r0,1
705: mvc 0(4,%r15),__VDSO_XTIME_SEC+4(%r5)
71 cl %r4,__VDSO_UPD_COUNT+4(%r5) /* check update counter */
72 jne 1b
73 l %r4,__VDSO_TK_SHIFT(%r5) /* Timekeeper shift */
74 srdl %r0,0(%r4) /* >> tk->shift */
75 l %r4,0(%r15) /* get tv_sec from stack */
76 basr %r5,0
776: ltr %r0,%r0
78 jnz 7f
79 cl %r1,11f-6b(%r5)
80 jl 8f
817: ahi %r4,1
82 sl %r1,11f-6b(%r5)
83 brc 3,6b
84 ahi %r0,-1
85 j 6b
868: st %r4,0(%r2) /* store tv->tv_sec */
87 ltr %r1,%r1
88 m %r0,12f-6b(%r5)
89 jnm 9f
90 al %r0,12f-6b(%r5)
919: srl %r0,6
92 st %r0,4(%r2) /* store tv->tv_usec */
9310: slr %r2,%r2
94 ahi %r15,16
95 br %r14
9611: .long 1000000000
9712: .long 274877907
9813: .long _vdso_data - 0b
99 .cfi_endproc
100 .size __kernel_gettimeofday,.-__kernel_gettimeofday