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 get_datapage r5 36 .ifeq \call_time 37 addi r5, r5, VDSO_DATA_OFFSET 38 .else 39 addi r4, r5, VDSO_DATA_OFFSET 40 .endif 41#ifdef __powerpc64__ 42 bl CFUNC(DOTSYM(\funct)) 43#else 44 bl \funct 45#endif 46 PPC_LL r0, PPC_MIN_STKFRM + PPC_LR_STKOFF(r1) 47#ifdef __powerpc64__ 48 PPC_LL r2, PPC_MIN_STKFRM + STK_GOT(r1) 49 .cfi_restore r2 50#endif 51 .ifeq \call_time 52 cmpwi r3, 0 53 .endif 54 mtlr r0 55 addi r1, r1, 2 * PPC_MIN_STKFRM 56 .cfi_restore lr 57 .cfi_def_cfa_offset 0 58 crclr so 59 .ifeq \call_time 60 beqlr+ 61 crset so 62 neg r3, r3 63 .endif 64 blr 65 .cfi_endproc 66.endm 67 68 .text 69/* 70 * Exact prototype of gettimeofday 71 * 72 * int __kernel_gettimeofday(struct timeval *tv, struct timezone *tz); 73 * 74 */ 75V_FUNCTION_BEGIN(__kernel_gettimeofday) 76 cvdso_call __c_kernel_gettimeofday 77V_FUNCTION_END(__kernel_gettimeofday) 78 79/* 80 * Exact prototype of clock_gettime() 81 * 82 * int __kernel_clock_gettime(clockid_t clock_id, struct timespec *tp); 83 * 84 */ 85V_FUNCTION_BEGIN(__kernel_clock_gettime) 86 cvdso_call __c_kernel_clock_gettime 87V_FUNCTION_END(__kernel_clock_gettime) 88 89/* 90 * Exact prototype of clock_gettime64() 91 * 92 * int __kernel_clock_gettime64(clockid_t clock_id, struct __timespec64 *ts); 93 * 94 */ 95#ifndef __powerpc64__ 96V_FUNCTION_BEGIN(__kernel_clock_gettime64) 97 cvdso_call __c_kernel_clock_gettime64 98V_FUNCTION_END(__kernel_clock_gettime64) 99#endif 100 101/* 102 * Exact prototype of clock_getres() 103 * 104 * int __kernel_clock_getres(clockid_t clock_id, struct timespec *res); 105 * 106 */ 107V_FUNCTION_BEGIN(__kernel_clock_getres) 108 cvdso_call __c_kernel_clock_getres 109V_FUNCTION_END(__kernel_clock_getres) 110 111 112/* 113 * Exact prototype of time() 114 * 115 * time_t time(time *t); 116 * 117 */ 118V_FUNCTION_BEGIN(__kernel_time) 119 cvdso_call __c_kernel_time call_time=1 120V_FUNCTION_END(__kernel_time) 121 122/* Routines for restoring integer registers, called by the compiler. */ 123/* Called with r11 pointing to the stack header word of the caller of the */ 124/* function, just beyond the end of the integer restore area. */ 125#ifndef __powerpc64__ 126_GLOBAL(_restgpr_31_x) 127_GLOBAL(_rest32gpr_31_x) 128 lwz r0,4(r11) 129 lwz r31,-4(r11) 130 mtlr r0 131 mr r1,r11 132 blr 133#endif 134