projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 2874c5fd | 1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
| a7f290da | 2 | /* |
| f061fb03 CL |
3 | * Userland implementation of gettimeofday() for processes |
| 4 | * for use in the vDSO | |
| a7f290da BH |
5 | * |
| 6 | * Copyright (C) 2004 Benjamin Herrenschmuidt (benh@kernel.crashing.org, | |
| 7 | * IBM Corp. | |
| a7f290da | 8 | */ |
| a7f290da BH |
9 | #include <asm/processor.h> |
| 10 | #include <asm/ppc_asm.h> | |
| 11 | #include <asm/vdso.h> | |
| ec0895f0 | 12 | #include <asm/vdso_datapage.h> |
| a7f290da BH |
13 | #include <asm/asm-offsets.h> |
| 14 | #include <asm/unistd.h> | |
| 692b21d7 CL |
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 | mflr r0 | |
| 26 | .cfi_register lr, r0 | |
| 27 | PPC_STLU r1, -PPC_MIN_STKFRM(r1) | |
| 28 | PPC_STL r0, PPC_MIN_STKFRM + PPC_LR_STKOFF(r1) | |
| 29 | #ifdef __powerpc64__ | |
| 30 | PPC_STL r2, PPC_MIN_STKFRM + STK_GOT(r1) | |
| 31 | #endif | |
| 32 | get_datapage r5 | |
| 33 | .ifeq \call_time | |
| 34 | addi r5, r5, VDSO_DATA_OFFSET | |
| 35 | .else | |
| 36 | addi r4, r5, VDSO_DATA_OFFSET | |
| 37 | .endif | |
| 38 | bl DOTSYM(\funct) | |
| 39 | PPC_LL r0, PPC_MIN_STKFRM + PPC_LR_STKOFF(r1) | |
| 40 | #ifdef __powerpc64__ | |
| 41 | PPC_LL r2, PPC_MIN_STKFRM + STK_GOT(r1) | |
| 42 | #endif | |
| 43 | .ifeq \call_time | |
| 44 | cmpwi r3, 0 | |
| 45 | .endif | |
| 46 | mtlr r0 | |
| 47 | .cfi_restore lr | |
| 48 | addi r1, r1, 2 * PPC_MIN_STKFRM | |
| 49 | crclr so | |
| 50 | .ifeq \call_time | |
| 51 | beqlr+ | |
| 52 | crset so | |
| 53 | neg r3, r3 | |
| 54 | .endif | |
| 55 | blr | |
| 56 | .cfi_endproc | |
| 57 | .endm | |
| 597bc5c0 | 58 | |
| a7f290da BH |
59 | .text |
| 60 | /* | |
| 61 | * Exact prototype of gettimeofday | |
| 62 | * | |
| 63 | * int __kernel_gettimeofday(struct timeval *tv, struct timezone *tz); | |
| 64 | * | |
| 65 | */ | |
| 66 | V_FUNCTION_BEGIN(__kernel_gettimeofday) | |
| ab037dd8 | 67 | cvdso_call __c_kernel_gettimeofday |
| a7f290da BH |
68 | V_FUNCTION_END(__kernel_gettimeofday) |
| 69 | ||
| 70 | /* | |
| 71 | * Exact prototype of clock_gettime() | |
| 72 | * | |
| 73 | * int __kernel_clock_gettime(clockid_t clock_id, struct timespec *tp); | |
| 74 | * | |
| 75 | */ | |
| 76 | V_FUNCTION_BEGIN(__kernel_clock_gettime) | |
| ab037dd8 | 77 | cvdso_call __c_kernel_clock_gettime |
| a7f290da BH |
78 | V_FUNCTION_END(__kernel_clock_gettime) |
| 79 | ||
| d0e3fc69 CL |
80 | /* |
| 81 | * Exact prototype of clock_gettime64() | |
| 82 | * | |
| 83 | * int __kernel_clock_gettime64(clockid_t clock_id, struct __timespec64 *ts); | |
| 84 | * | |
| 85 | */ | |
| f061fb03 | 86 | #ifndef __powerpc64__ |
| d0e3fc69 CL |
87 | V_FUNCTION_BEGIN(__kernel_clock_gettime64) |
| 88 | cvdso_call __c_kernel_clock_gettime64 | |
| 89 | V_FUNCTION_END(__kernel_clock_gettime64) | |
| f061fb03 | 90 | #endif |
| a7f290da BH |
91 | |
| 92 | /* | |
| 93 | * Exact prototype of clock_getres() | |
| 94 | * | |
| 95 | * int __kernel_clock_getres(clockid_t clock_id, struct timespec *res); | |
| 96 | * | |
| 97 | */ | |
| 98 | V_FUNCTION_BEGIN(__kernel_clock_getres) | |
| ab037dd8 | 99 | cvdso_call __c_kernel_clock_getres |
| a7f290da BH |
100 | V_FUNCTION_END(__kernel_clock_getres) |
| 101 | ||
| 102 | ||
| fcb41a20 AZ |
103 | /* |
| 104 | * Exact prototype of time() | |
| 105 | * | |
| 106 | * time_t time(time *t); | |
| 107 | * | |
| 108 | */ | |
| 109 | V_FUNCTION_BEGIN(__kernel_time) | |
| 9b97bea9 | 110 | cvdso_call __c_kernel_time call_time=1 |
| fcb41a20 | 111 | V_FUNCTION_END(__kernel_time) |
| 08c18b63 CL |
112 | |
| 113 | /* Routines for restoring integer registers, called by the compiler. */ | |
| 114 | /* Called with r11 pointing to the stack header word of the caller of the */ | |
| 115 | /* function, just beyond the end of the integer restore area. */ | |
| f061fb03 | 116 | #ifndef __powerpc64__ |
| 08c18b63 CL |
117 | _GLOBAL(_restgpr_31_x) |
| 118 | _GLOBAL(_rest32gpr_31_x) | |
| 119 | lwz r0,4(r11) | |
| 120 | lwz r31,-4(r11) | |
| 121 | mtlr r0 | |
| 122 | mr r1,r11 | |
| 123 | blr | |
| f061fb03 | 124 | #endif |