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- /*
- * Userland implementation of clock_getres() for 64 bits processes in a
- * s390 kernel for use in the vDSO
- *
- * Copyright IBM Corp. 2008
- * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License (version 2 only)
- * as published by the Free Software Foundation.
- */
- #include <asm/vdso.h>
- #include <asm/asm-offsets.h>
- #include <asm/unistd.h>
- .text
- .align 4
- .globl __kernel_clock_getres
- .type __kernel_clock_getres,@function
- __kernel_clock_getres:
- .cfi_startproc
- cghi %r2,__CLOCK_REALTIME
- je 0f
- cghi %r2,__CLOCK_MONOTONIC
- je 0f
- cghi %r2,__CLOCK_THREAD_CPUTIME_ID
- je 0f
- cghi %r2,-2 /* Per-thread CPUCLOCK with PID=0, VIRT=1 */
- jne 2f
- larl %r5,_vdso_data
- icm %r0,15,__LC_ECTG_OK(%r5)
- jz 2f
- 0: ltgr %r3,%r3
- jz 1f /* res == NULL */
- larl %r1,3f
- lg %r0,0(%r1)
- xc 0(8,%r3),0(%r3) /* set tp->tv_sec to zero */
- stg %r0,8(%r3) /* store tp->tv_usec */
- 1: lghi %r2,0
- br %r14
- 2: lghi %r1,__NR_clock_getres /* fallback to svc */
- svc 0
- br %r14
- 3: .quad __CLOCK_REALTIME_RES
- .cfi_endproc
- .size __kernel_clock_getres,.-__kernel_clock_getres
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