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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 | /* SPDX-License-Identifier: GPL-2.0-or-later */ /* * Userland implementation of gettimeofday() for processes * for use in the vDSO * * Copyright (C) 2004 Benjamin Herrenschmuidt (benh@kernel.crashing.org, * IBM Corp. */ #include <asm/processor.h> #include <asm/ppc_asm.h> #include <asm/vdso.h> #include <asm/vdso_datapage.h> #include <asm/asm-offsets.h> #include <asm/unistd.h> /* * The macro sets two stack frames, one for the caller and one for the callee * because there are no requirement for the caller to set a stack frame when * calling VDSO so it may have omitted to set one, especially on PPC64 */ .macro cvdso_call funct call_time=0 .cfi_startproc PPC_STLU r1, -PPC_MIN_STKFRM(r1) .cfi_adjust_cfa_offset PPC_MIN_STKFRM mflr r0 PPC_STLU r1, -PPC_MIN_STKFRM(r1) .cfi_adjust_cfa_offset PPC_MIN_STKFRM PPC_STL r0, PPC_MIN_STKFRM + PPC_LR_STKOFF(r1) .cfi_rel_offset lr, PPC_MIN_STKFRM + PPC_LR_STKOFF #ifdef __powerpc64__ PPC_STL r2, PPC_MIN_STKFRM + STK_GOT(r1) .cfi_rel_offset r2, PPC_MIN_STKFRM + STK_GOT #endif get_datapage r5 .ifeq \call_time addi r5, r5, VDSO_DATA_OFFSET .else addi r4, r5, VDSO_DATA_OFFSET .endif bl CFUNC(DOTSYM(\funct)) PPC_LL r0, PPC_MIN_STKFRM + PPC_LR_STKOFF(r1) #ifdef __powerpc64__ PPC_LL r2, PPC_MIN_STKFRM + STK_GOT(r1) .cfi_restore r2 #endif .ifeq \call_time cmpwi r3, 0 .endif mtlr r0 addi r1, r1, 2 * PPC_MIN_STKFRM .cfi_restore lr .cfi_def_cfa_offset 0 crclr so .ifeq \call_time beqlr+ crset so neg r3, r3 .endif blr .cfi_endproc .endm .text /* * Exact prototype of gettimeofday * * int __kernel_gettimeofday(struct timeval *tv, struct timezone *tz); * */ V_FUNCTION_BEGIN(__kernel_gettimeofday) cvdso_call __c_kernel_gettimeofday V_FUNCTION_END(__kernel_gettimeofday) /* * Exact prototype of clock_gettime() * * int __kernel_clock_gettime(clockid_t clock_id, struct timespec *tp); * */ V_FUNCTION_BEGIN(__kernel_clock_gettime) cvdso_call __c_kernel_clock_gettime V_FUNCTION_END(__kernel_clock_gettime) /* * Exact prototype of clock_gettime64() * * int __kernel_clock_gettime64(clockid_t clock_id, struct __timespec64 *ts); * */ #ifndef __powerpc64__ V_FUNCTION_BEGIN(__kernel_clock_gettime64) cvdso_call __c_kernel_clock_gettime64 V_FUNCTION_END(__kernel_clock_gettime64) #endif /* * Exact prototype of clock_getres() * * int __kernel_clock_getres(clockid_t clock_id, struct timespec *res); * */ V_FUNCTION_BEGIN(__kernel_clock_getres) cvdso_call __c_kernel_clock_getres V_FUNCTION_END(__kernel_clock_getres) /* * Exact prototype of time() * * time_t time(time *t); * */ V_FUNCTION_BEGIN(__kernel_time) cvdso_call __c_kernel_time call_time=1 V_FUNCTION_END(__kernel_time) /* Routines for restoring integer registers, called by the compiler. */ /* Called with r11 pointing to the stack header word of the caller of the */ /* function, just beyond the end of the integer restore area. */ #ifndef __powerpc64__ _GLOBAL(_restgpr_31_x) _GLOBAL(_rest32gpr_31_x) lwz r0,4(r11) lwz r31,-4(r11) mtlr r0 mr r1,r11 blr #endif |