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path: root/arch/s390/kernel/vdso64/clock_gettime.S
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Diffstat (limited to 'arch/s390/kernel/vdso64/clock_gettime.S')
-rw-r--r--arch/s390/kernel/vdso64/clock_gettime.S39
1 files changed, 34 insertions, 5 deletions
diff --git a/arch/s390/kernel/vdso64/clock_gettime.S b/arch/s390/kernel/vdso64/clock_gettime.S
index 738a410b7eb2..79dbfee831ec 100644
--- a/arch/s390/kernel/vdso64/clock_gettime.S
+++ b/arch/s390/kernel/vdso64/clock_gettime.S
@@ -22,8 +22,10 @@ __kernel_clock_gettime:
22 larl %r5,_vdso_data 22 larl %r5,_vdso_data
23 cghi %r2,CLOCK_REALTIME 23 cghi %r2,CLOCK_REALTIME
24 je 4f 24 je 4f
25 cghi %r2,-2 /* CLOCK_THREAD_CPUTIME_ID for this thread */
26 je 9f
25 cghi %r2,CLOCK_MONOTONIC 27 cghi %r2,CLOCK_MONOTONIC
26 jne 9f 28 jne 12f
27 29
28 /* CLOCK_MONOTONIC */ 30 /* CLOCK_MONOTONIC */
29 ltgr %r3,%r3 31 ltgr %r3,%r3
@@ -42,7 +44,7 @@ __kernel_clock_gettime:
42 alg %r0,__VDSO_WTOM_SEC(%r5) 44 alg %r0,__VDSO_WTOM_SEC(%r5)
43 clg %r4,__VDSO_UPD_COUNT(%r5) /* check update counter */ 45 clg %r4,__VDSO_UPD_COUNT(%r5) /* check update counter */
44 jne 0b 46 jne 0b
45 larl %r5,10f 47 larl %r5,13f
461: clg %r1,0(%r5) 481: clg %r1,0(%r5)
47 jl 2f 49 jl 2f
48 slg %r1,0(%r5) 50 slg %r1,0(%r5)
@@ -68,7 +70,7 @@ __kernel_clock_gettime:
68 lg %r0,__VDSO_XTIME_SEC(%r5) 70 lg %r0,__VDSO_XTIME_SEC(%r5)
69 clg %r4,__VDSO_UPD_COUNT(%r5) /* check update counter */ 71 clg %r4,__VDSO_UPD_COUNT(%r5) /* check update counter */
70 jne 5b 72 jne 5b
71 larl %r5,10f 73 larl %r5,13f
726: clg %r1,0(%r5) 746: clg %r1,0(%r5)
73 jl 7f 75 jl 7f
74 slg %r1,0(%r5) 76 slg %r1,0(%r5)
@@ -79,11 +81,38 @@ __kernel_clock_gettime:
798: lghi %r2,0 818: lghi %r2,0
80 br %r14 82 br %r14
81 83
84 /* CLOCK_THREAD_CPUTIME_ID for this thread */
859: icm %r0,15,__VDSO_ECTG_OK(%r5)
86 jz 12f
87 ear %r2,%a4
88 llilh %r4,0x0100
89 sar %a4,%r4
90 lghi %r4,0
91 sacf 512 /* Magic ectg instruction */
92 .insn ssf,0xc80100000000,__VDSO_ECTG_BASE(4),__VDSO_ECTG_USER(4),4
93 sacf 0
94 sar %a4,%r2
95 algr %r1,%r0 /* r1 = cputime as TOD value */
96 mghi %r1,1000 /* convert to nanoseconds */
97 srlg %r1,%r1,12 /* r1 = cputime in nanosec */
98 lgr %r4,%r1
99 larl %r5,13f
100 srlg %r1,%r1,9 /* divide by 1000000000 */
101 mlg %r0,8(%r5)
102 srlg %r0,%r0,11 /* r0 = tv_sec */
103 stg %r0,0(%r3)
104 msg %r0,0(%r5) /* calculate tv_nsec */
105 slgr %r4,%r0 /* r4 = tv_nsec */
106 stg %r4,8(%r3)
107 lghi %r2,0
108 br %r14
109
82 /* Fallback to system call */ 110 /* Fallback to system call */
839: lghi %r1,__NR_clock_gettime 11112: lghi %r1,__NR_clock_gettime
84 svc 0 112 svc 0
85 br %r14 113 br %r14
86 114
8710: .quad 1000000000 11513: .quad 1000000000
11614: .quad 19342813113834067
88 .cfi_endproc 117 .cfi_endproc
89 .size __kernel_clock_gettime,.-__kernel_clock_gettime 118 .size __kernel_clock_gettime,.-__kernel_clock_gettime