| Martin Schwidefsky | b020632 | 2008-12-25 13:38:36 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Userland implementation of clock_getres() for 64 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_clock_getres |
| 19 | .type __kernel_clock_getres,@function |
| 20 | __kernel_clock_getres: |
| 21 | .cfi_startproc |
| 22 | cghi %r2,CLOCK_REALTIME |
| 23 | je 0f |
| 24 | cghi %r2,CLOCK_MONOTONIC |
| Martin Schwidefsky | c742b31 | 2008-12-31 15:11:42 +0100 | [diff] [blame] | 25 | je 0f |
| 26 | cghi %r2,-2 /* CLOCK_THREAD_CPUTIME_ID for this thread */ |
| Martin Schwidefsky | b020632 | 2008-12-25 13:38:36 +0100 | [diff] [blame] | 27 | jne 2f |
| Martin Schwidefsky | c742b31 | 2008-12-31 15:11:42 +0100 | [diff] [blame] | 28 | larl %r5,_vdso_data |
| 29 | icm %r0,15,__LC_ECTG_OK(%r5) |
| 30 | jz 2f |
| Martin Schwidefsky | b020632 | 2008-12-25 13:38:36 +0100 | [diff] [blame] | 31 | 0: ltgr %r3,%r3 |
| 32 | jz 1f /* res == NULL */ |
| 33 | larl %r1,3f |
| 34 | lg %r0,0(%r1) |
| 35 | xc 0(8,%r3),0(%r3) /* set tp->tv_sec to zero */ |
| 36 | stg %r0,8(%r3) /* store tp->tv_usec */ |
| 37 | 1: lghi %r2,0 |
| 38 | br %r14 |
| 39 | 2: lghi %r1,__NR_clock_getres /* fallback to svc */ |
| 40 | svc 0 |
| 41 | br %r14 |
| 42 | 3: .quad CLOCK_REALTIME_RES |
| 43 | .cfi_endproc |
| 44 | .size __kernel_clock_getres,.-__kernel_clock_getres |