1/* SPDX-License-Identifier: GPL-2.0-or-later */ 2/* 3 * Userland implementation of gettimeofday() for processes 4 * for use in the vDSO 5 * 6 * Copyright (C) 2004 Benjamin Herrenschmuidt (benh@kernel.crashing.org, 7 * IBM Corp. 8 */ 9#include <asm/processor.h> 10#include <asm/ppc_asm.h> 11#include <asm/vdso.h> 12#include <asm/vdso_datapage.h> 13#include <asm/asm-offsets.h> 14#include <asm/unistd.h> 15 16/* 17 * The macro sets two stack frames, one for the caller and one for the callee 18 * because there are no requirement for the caller to set a stack frame when 19 * calling VDSO so it may have omitted to set one, especially on PPC64 20 */ 21 22.macro cvdso_call funct call_time=0 23 .cfi_startproc 24 PPC_STLU r1, -PPC_MIN_STKFRM(r1) 25 .cfi_adjust_cfa_offset PPC_MIN_STKFRM 26 mflr r0 27 PPC_STLU r1, -PPC_MIN_STKFRM(r1) 28 .cfi_adjust_cfa_offset PPC_MIN_STKFRM 29 PPC_STL r0, PPC_MIN_STKFRM + PPC_LR_STKOFF(r1) 30 .cfi_rel_offset lr, PPC_MIN_STKFRM + PPC_LR_STKOFF 31#ifdef __powerpc64__ 32 PPC_STL r2, PPC_MIN_STKFRM + STK_GOT(r1) 33 .cfi_rel_offset r2, PPC_MIN_STKFRM + STK_GOT 34#endif 35 .ifeq \call_time 36 get_datapage r5 VDSO_DATA_OFFSET 37 .else 38 get_datapage r4 VDSO_DATA_OFFSET 39 .endif 40 bl CFUNC(DOTSYM(\funct)) 41 PPC_LL r0, PPC_MIN_STKFRM + PPC_LR_STKOFF(r1) 42#ifdef __powerpc64__ 43 PPC_LL r2, PPC_MIN_STKFRM + STK_GOT(r1) 44 .cfi_restore r2 45#endif 46 .ifeq \call_time 47 cmpwi r3, 0 48 .endif 49 mtlr r0 50 addi r1, r1, 2 * PPC_MIN_STKFRM 51 .cfi_restore lr 52 .cfi_def_cfa_offset 0 53 crclr so 54 .ifeq \call_time 55 beqlr+ 56 crset so 57 neg r3, r3 58 .endif 59 blr 60 .cfi_endproc 61.endm 62 63 .text 64/* 65 * Exact prototype of gettimeofday 66 * 67 * int __kernel_gettimeofday(struct timeval *tv, struct timezone *tz); 68 * 69 */ 70V_FUNCTION_BEGIN(__kernel_gettimeofday) 71 cvdso_call __c_kernel_gettimeofday 72V_FUNCTION_END(__kernel_gettimeofday) 73 74/* 75 * Exact prototype of clock_gettime() 76 * 77 * int __kernel_clock_gettime(clockid_t clock_id, struct timespec *tp); 78 * 79 */ 80V_FUNCTION_BEGIN(__kernel_clock_gettime) 81 cvdso_call __c_kernel_clock_gettime 82V_FUNCTION_END(__kernel_clock_gettime) 83 84/* 85 * Exact prototype of clock_gettime64() 86 * 87 * int __kernel_clock_gettime64(clockid_t clock_id, struct __timespec64 *ts); 88 * 89 */ 90#ifndef __powerpc64__ 91V_FUNCTION_BEGIN(__kernel_clock_gettime64) 92 cvdso_call __c_kernel_clock_gettime64 93V_FUNCTION_END(__kernel_clock_gettime64) 94#endif 95 96/* 97 * Exact prototype of clock_getres() 98 * 99 * int __kernel_clock_getres(clockid_t clock_id, struct timespec *res); 100 * 101 */ 102V_FUNCTION_BEGIN(__kernel_clock_getres) 103 cvdso_call __c_kernel_clock_getres 104V_FUNCTION_END(__kernel_clock_getres) 105 106 107/* 108 * Exact prototype of time() 109 * 110 * time_t time(time *t); 111 * 112 */ 113V_FUNCTION_BEGIN(__kernel_time) 114 cvdso_call __c_kernel_time call_time=1 115V_FUNCTION_END(__kernel_time) 116