| /* | |
| * 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 | |
| larl %r1,4f | |
| cghi %r2,__CLOCK_REALTIME_COARSE | |
| je 0f | |
| cghi %r2,__CLOCK_MONOTONIC_COARSE | |
| je 0f | |
| larl %r1,3f | |
| 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 */ | |
| 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 | |
| 4: .quad __CLOCK_COARSE_RES | |
| .cfi_endproc | |
| .size __kernel_clock_getres,.-__kernel_clock_getres |