diff options
Diffstat (limited to 'arch/s390/kernel/vdso64/clock_getres.S')
| -rw-r--r-- | arch/s390/kernel/vdso64/clock_getres.S | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/arch/s390/kernel/vdso64/clock_getres.S b/arch/s390/kernel/vdso64/clock_getres.S new file mode 100644 index 000000000..0c79caa32 --- /dev/null +++ b/arch/s390/kernel/vdso64/clock_getres.S @@ -0,0 +1,50 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * 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) + */ +#include <asm/vdso.h> +#include <asm/asm-offsets.h> +#include <asm/unistd.h> +#include <asm/dwarf.h> + + .text + .align 4 + .globl __kernel_clock_getres + .type __kernel_clock_getres,@function +__kernel_clock_getres: + CFI_STARTPROC + larl %r1,3f + lg %r0,0(%r1) + cghi %r2,__CLOCK_REALTIME_COARSE + je 0f + cghi %r2,__CLOCK_MONOTONIC_COARSE + je 0f + larl %r1,_vdso_data + llgf %r0,__VDSO_CLOCK_REALTIME_RES(%r1) + 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 */ + 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 + CFI_ENDPROC +3: .quad __CLOCK_COARSE_RES + .size __kernel_clock_getres,.-__kernel_clock_getres |