diff options
Diffstat (limited to 'arch/s390/kernel/vdso64/clock_gettime.S')
| -rw-r--r-- | arch/s390/kernel/vdso64/clock_gettime.S | 45 |
1 files changed, 24 insertions, 21 deletions
diff --git a/arch/s390/kernel/vdso64/clock_gettime.S b/arch/s390/kernel/vdso64/clock_gettime.S index 9c3b12626dba..fac3ab5ec83a 100644 --- a/arch/s390/kernel/vdso64/clock_gettime.S +++ b/arch/s390/kernel/vdso64/clock_gettime.S @@ -1,25 +1,25 @@ +/* SPDX-License-Identifier: GPL-2.0 */ /* * Userland implementation of clock_gettime() 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> +#include <asm/dwarf.h> .text .align 4 .globl __kernel_clock_gettime .type __kernel_clock_gettime,@function __kernel_clock_gettime: - .cfi_startproc + CFI_STARTPROC aghi %r15,-16 + CFI_DEF_CFA_OFFSET 176 + CFI_VAL_OFFSET 15, -160 larl %r5,_vdso_data cghi %r2,__CLOCK_REALTIME_COARSE je 4f @@ -56,9 +56,13 @@ __kernel_clock_gettime: stg %r1,8(%r3) /* store tp->tv_nsec */ lghi %r2,0 aghi %r15,16 + CFI_DEF_CFA_OFFSET 160 + CFI_RESTORE 15 br %r14 /* CLOCK_MONOTONIC_COARSE */ + CFI_DEF_CFA_OFFSET 176 + CFI_VAL_OFFSET 15, -160 3: lg %r4,__VDSO_UPD_COUNT(%r5) /* load update counter */ tmll %r4,0x0001 /* pending update ? loop */ jnz 3b @@ -111,26 +115,19 @@ __kernel_clock_gettime: stg %r1,8(%r3) /* store tp->tv_nsec */ lghi %r2,0 aghi %r15,16 + CFI_DEF_CFA_OFFSET 160 + CFI_RESTORE 15 br %r14 /* CPUCLOCK_VIRT for this thread */ -9: icm %r0,15,__VDSO_ECTG_OK(%r5) + CFI_DEF_CFA_OFFSET 176 + CFI_VAL_OFFSET 15, -160 +9: lghi %r4,0 + icm %r0,15,__VDSO_ECTG_OK(%r5) jz 12f - ear %r2,%a4 - llilh %r4,0x0100 - sar %a4,%r4 - lghi %r4,0 - epsw %r5,0 - sacf 512 /* Magic ectg instruction */ + sacf 256 /* Magic ectg instruction */ .insn ssf,0xc80100000000,__VDSO_ECTG_BASE(4),__VDSO_ECTG_USER(4),4 - tml %r5,0x4000 - jo 11f - tml %r5,0x8000 - jno 10f - sacf 256 - j 11f -10: sacf 0 -11: sar %a4,%r2 + sacf 0 algr %r1,%r0 /* r1 = cputime as TOD value */ mghi %r1,1000 /* convert to nanoseconds */ srlg %r1,%r1,12 /* r1 = cputime in nanosec */ @@ -145,15 +142,21 @@ __kernel_clock_gettime: stg %r4,8(%r3) lghi %r2,0 aghi %r15,16 + CFI_DEF_CFA_OFFSET 160 + CFI_RESTORE 15 br %r14 /* Fallback to system call */ + CFI_DEF_CFA_OFFSET 176 + CFI_VAL_OFFSET 15, -160 12: lghi %r1,__NR_clock_gettime svc 0 aghi %r15,16 + CFI_DEF_CFA_OFFSET 160 + CFI_RESTORE 15 br %r14 + CFI_ENDPROC 13: .quad 1000000000 14: .quad 19342813113834067 - .cfi_endproc .size __kernel_clock_gettime,.-__kernel_clock_gettime |