157a1a27d5
Commit "timekeeping: Fix clock_gettime vsyscall time warp" (0696b711e) introduced the new parameter "mult" to update_vsyscall(). This parameter contains the internal NTP adjusted clock multiplier. The s390x vdso did not use this adjusted multiplier. Instead, it used the constant clock multiplier for gettimeofday() and clock_gettime() variants. This may result in observable time warps as explained in commit0696b711e. Make the NTP adjusted clock multiplier available to the s390x vdso implementation and use it for time calculations. Cc: <stable@kernel.org> Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
128 lines
3 KiB
ArmAsm
128 lines
3 KiB
ArmAsm
/*
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* Userland implementation of clock_gettime() for 32 bits processes in a
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* s390 kernel for use in the vDSO
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*
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* Copyright IBM Corp. 2008
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* Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License (version 2 only)
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* as published by the Free Software Foundation.
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*/
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#include <asm/vdso.h>
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#include <asm/asm-offsets.h>
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#include <asm/unistd.h>
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.text
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.align 4
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.globl __kernel_clock_gettime
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.type __kernel_clock_gettime,@function
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__kernel_clock_gettime:
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.cfi_startproc
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basr %r5,0
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0: al %r5,21f-0b(%r5) /* get &_vdso_data */
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chi %r2,CLOCK_REALTIME
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je 10f
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chi %r2,CLOCK_MONOTONIC
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jne 19f
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/* CLOCK_MONOTONIC */
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ltr %r3,%r3
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jz 9f /* tp == NULL */
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1: l %r4,__VDSO_UPD_COUNT+4(%r5) /* load update counter */
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tml %r4,0x0001 /* pending update ? loop */
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jnz 1b
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stck 24(%r15) /* Store TOD clock */
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lm %r0,%r1,24(%r15)
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s %r0,__VDSO_XTIME_STAMP(%r5) /* TOD - cycle_last */
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sl %r1,__VDSO_XTIME_STAMP+4(%r5)
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brc 3,2f
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ahi %r0,-1
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2: ms %r0,__VDSO_NTP_MULT(%r5) /* cyc2ns(clock,cycle_delta) */
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lr %r2,%r0
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l %r0,__VDSO_NTP_MULT(%r5)
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ltr %r1,%r1
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mr %r0,%r0
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jnm 3f
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a %r0,__VDSO_NTP_MULT(%r5)
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3: alr %r0,%r2
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srdl %r0,12
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al %r0,__VDSO_XTIME_NSEC(%r5) /* + xtime */
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al %r1,__VDSO_XTIME_NSEC+4(%r5)
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brc 12,4f
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ahi %r0,1
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4: l %r2,__VDSO_XTIME_SEC+4(%r5)
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al %r0,__VDSO_WTOM_NSEC(%r5) /* + wall_to_monotonic */
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al %r1,__VDSO_WTOM_NSEC+4(%r5)
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brc 12,5f
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ahi %r0,1
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5: al %r2,__VDSO_WTOM_SEC+4(%r5)
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cl %r4,__VDSO_UPD_COUNT+4(%r5) /* check update counter */
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jne 1b
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basr %r5,0
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6: ltr %r0,%r0
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jnz 7f
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cl %r1,20f-6b(%r5)
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jl 8f
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7: ahi %r2,1
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sl %r1,20f-6b(%r5)
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brc 3,6b
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ahi %r0,-1
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j 6b
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8: st %r2,0(%r3) /* store tp->tv_sec */
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st %r1,4(%r3) /* store tp->tv_nsec */
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9: lhi %r2,0
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br %r14
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/* CLOCK_REALTIME */
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10: ltr %r3,%r3 /* tp == NULL */
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jz 18f
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11: l %r4,__VDSO_UPD_COUNT+4(%r5) /* load update counter */
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tml %r4,0x0001 /* pending update ? loop */
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jnz 11b
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stck 24(%r15) /* Store TOD clock */
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lm %r0,%r1,24(%r15)
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s %r0,__VDSO_XTIME_STAMP(%r5) /* TOD - cycle_last */
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sl %r1,__VDSO_XTIME_STAMP+4(%r5)
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brc 3,12f
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ahi %r0,-1
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12: ms %r0,__VDSO_NTP_MULT(%r5) /* cyc2ns(clock,cycle_delta) */
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lr %r2,%r0
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l %r0,__VDSO_NTP_MULT(%r5)
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ltr %r1,%r1
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mr %r0,%r0
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jnm 13f
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a %r0,__VDSO_NTP_MULT(%r5)
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13: alr %r0,%r2
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srdl %r0,12
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al %r0,__VDSO_XTIME_NSEC(%r5) /* + xtime */
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al %r1,__VDSO_XTIME_NSEC+4(%r5)
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brc 12,14f
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ahi %r0,1
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14: l %r2,__VDSO_XTIME_SEC+4(%r5)
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cl %r4,__VDSO_UPD_COUNT+4(%r5) /* check update counter */
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jne 11b
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basr %r5,0
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15: ltr %r0,%r0
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jnz 16f
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cl %r1,20f-15b(%r5)
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jl 17f
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16: ahi %r2,1
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sl %r1,20f-15b(%r5)
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brc 3,15b
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ahi %r0,-1
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j 15b
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17: st %r2,0(%r3) /* store tp->tv_sec */
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st %r1,4(%r3) /* store tp->tv_nsec */
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18: lhi %r2,0
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br %r14
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/* Fallback to system call */
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19: lhi %r1,__NR_clock_gettime
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svc 0
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br %r14
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20: .long 1000000000
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21: .long _vdso_data - 0b
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.cfi_endproc
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.size __kernel_clock_gettime,.-__kernel_clock_gettime
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