1/* 2 * RISC-V linux replacement vdso. 3 * 4 * Copyright 2021 Linaro, Ltd. 5 * 6 * SPDX-License-Identifier: GPL-2.0-or-later 7 */ 8 9#include <asm/unistd.h> 10#include <asm/errno.h> 11 12#if __riscv_xlen == 32 13# define TARGET_ABI32 14#endif 15#include "vdso-asmoffset.h" 16 17 .text 18 19.macro endf name 20 .globl \name 21 .type \name, @function 22 .size \name, . - \name 23.endm 24 25.macro raw_syscall nr 26 li a7, \nr 27 ecall 28.endm 29 30.macro vdso_syscall name, nr 31\name: 32 raw_syscall \nr 33 ret 34endf \name 35.endm 36 37__vdso_gettimeofday: 38 .cfi_startproc 39#ifdef __NR_gettimeofday 40 raw_syscall __NR_gettimeofday 41 ret 42#else 43 /* No gettimeofday, fall back to clock_gettime64. */ 44 beq a1, zero, 1f 45 sw zero, 0(a1) /* tz->tz_minuteswest = 0 */ 46 sw zero, 4(a1) /* tz->tz_dsttime = 0 */ 471: addi sp, sp, -32 48 .cfi_adjust_cfa_offset 32 49 sw a0, 16(sp) /* save tv */ 50 mv a0, sp 51 raw_syscall __NR_clock_gettime64 52 lw t0, 0(sp) /* timespec.tv_sec.low */ 53 lw t1, 4(sp) /* timespec.tv_sec.high */ 54 lw t2, 8(sp) /* timespec.tv_nsec.low */ 55 lw a1, 16(sp) /* restore tv */ 56 addi sp, sp, 32 57 .cfi_adjust_cfa_offset -32 58 bne a0, zero, 9f /* syscall error? */ 59 li a0, -EOVERFLOW 60 bne t1, zero, 9f /* y2038? */ 61 li a0, 0 62 li t3, 1000 63 divu t2, t2, t3 /* nsec -> usec */ 64 sw t0, 0(a1) /* tz->tv_sec */ 65 sw t2, 4(a1) /* tz->tv_usec */ 669: ret 67#endif 68 .cfi_endproc 69endf __vdso_gettimeofday 70 71 .cfi_startproc 72 73#ifdef __NR_clock_gettime 74vdso_syscall __vdso_clock_gettime, __NR_clock_gettime 75#else 76vdso_syscall __vdso_clock_gettime, __NR_clock_gettime64 77#endif 78 79#ifdef __NR_clock_getres 80vdso_syscall __vdso_clock_getres, __NR_clock_getres 81#else 82vdso_syscall __vdso_clock_getres, __NR_clock_getres_time64 83#endif 84 85vdso_syscall __vdso_getcpu, __NR_getcpu 86 87__vdso_flush_icache: 88 /* qemu does not need to flush the icache */ 89 li a0, 0 90 ret 91endf __vdso_flush_icache 92 93 .cfi_endproc 94 95/* 96 * Start the unwind info at least one instruction before the signal 97 * trampoline, because the unwinder will assume we are returning 98 * after a call site. 99 */ 100 101 .cfi_startproc simple 102 .cfi_signal_frame 103 104#define sizeof_reg (__riscv_xlen / 4) 105#define sizeof_freg 8 106#define B_GR (offsetof_uc_mcontext - sizeof_rt_sigframe) 107#define B_FR (offsetof_uc_mcontext - sizeof_rt_sigframe + offsetof_freg0) 108 109 .cfi_def_cfa 2, sizeof_rt_sigframe 110 111 /* Return address */ 112 .cfi_return_column 64 113 .cfi_offset 64, B_GR + 0 /* pc */ 114 115 /* Integer registers */ 116 .cfi_offset 1, B_GR + 1 * sizeof_reg /* r1 (ra) */ 117 .cfi_offset 2, B_GR + 2 * sizeof_reg /* r2 (sp) */ 118 .cfi_offset 3, B_GR + 3 * sizeof_reg 119 .cfi_offset 4, B_GR + 4 * sizeof_reg 120 .cfi_offset 5, B_GR + 5 * sizeof_reg 121 .cfi_offset 6, B_GR + 6 * sizeof_reg 122 .cfi_offset 7, B_GR + 7 * sizeof_reg 123 .cfi_offset 8, B_GR + 8 * sizeof_reg 124 .cfi_offset 9, B_GR + 9 * sizeof_reg 125 .cfi_offset 10, B_GR + 10 * sizeof_reg 126 .cfi_offset 11, B_GR + 11 * sizeof_reg 127 .cfi_offset 12, B_GR + 12 * sizeof_reg 128 .cfi_offset 13, B_GR + 13 * sizeof_reg 129 .cfi_offset 14, B_GR + 14 * sizeof_reg 130 .cfi_offset 15, B_GR + 15 * sizeof_reg 131 .cfi_offset 16, B_GR + 16 * sizeof_reg 132 .cfi_offset 17, B_GR + 17 * sizeof_reg 133 .cfi_offset 18, B_GR + 18 * sizeof_reg 134 .cfi_offset 19, B_GR + 19 * sizeof_reg 135 .cfi_offset 20, B_GR + 20 * sizeof_reg 136 .cfi_offset 21, B_GR + 21 * sizeof_reg 137 .cfi_offset 22, B_GR + 22 * sizeof_reg 138 .cfi_offset 23, B_GR + 23 * sizeof_reg 139 .cfi_offset 24, B_GR + 24 * sizeof_reg 140 .cfi_offset 25, B_GR + 25 * sizeof_reg 141 .cfi_offset 26, B_GR + 26 * sizeof_reg 142 .cfi_offset 27, B_GR + 27 * sizeof_reg 143 .cfi_offset 28, B_GR + 28 * sizeof_reg 144 .cfi_offset 29, B_GR + 29 * sizeof_reg 145 .cfi_offset 30, B_GR + 30 * sizeof_reg 146 .cfi_offset 31, B_GR + 31 * sizeof_reg /* r31 */ 147 148 .cfi_offset 32, B_FR + 0 /* f0 */ 149 .cfi_offset 33, B_FR + 1 * sizeof_freg /* f1 */ 150 .cfi_offset 34, B_FR + 2 * sizeof_freg 151 .cfi_offset 35, B_FR + 3 * sizeof_freg 152 .cfi_offset 36, B_FR + 4 * sizeof_freg 153 .cfi_offset 37, B_FR + 5 * sizeof_freg 154 .cfi_offset 38, B_FR + 6 * sizeof_freg 155 .cfi_offset 39, B_FR + 7 * sizeof_freg 156 .cfi_offset 40, B_FR + 8 * sizeof_freg 157 .cfi_offset 41, B_FR + 9 * sizeof_freg 158 .cfi_offset 42, B_FR + 10 * sizeof_freg 159 .cfi_offset 43, B_FR + 11 * sizeof_freg 160 .cfi_offset 44, B_FR + 12 * sizeof_freg 161 .cfi_offset 45, B_FR + 13 * sizeof_freg 162 .cfi_offset 46, B_FR + 14 * sizeof_freg 163 .cfi_offset 47, B_FR + 15 * sizeof_freg 164 .cfi_offset 48, B_FR + 16 * sizeof_freg 165 .cfi_offset 49, B_FR + 17 * sizeof_freg 166 .cfi_offset 50, B_FR + 18 * sizeof_freg 167 .cfi_offset 51, B_FR + 19 * sizeof_freg 168 .cfi_offset 52, B_FR + 20 * sizeof_freg 169 .cfi_offset 53, B_FR + 21 * sizeof_freg 170 .cfi_offset 54, B_FR + 22 * sizeof_freg 171 .cfi_offset 55, B_FR + 23 * sizeof_freg 172 .cfi_offset 56, B_FR + 24 * sizeof_freg 173 .cfi_offset 57, B_FR + 25 * sizeof_freg 174 .cfi_offset 58, B_FR + 26 * sizeof_freg 175 .cfi_offset 59, B_FR + 27 * sizeof_freg 176 .cfi_offset 60, B_FR + 28 * sizeof_freg 177 .cfi_offset 61, B_FR + 29 * sizeof_freg 178 .cfi_offset 62, B_FR + 30 * sizeof_freg 179 .cfi_offset 63, B_FR + 31 * sizeof_freg /* f31 */ 180 181 nop 182 183__vdso_rt_sigreturn: 184 raw_syscall __NR_rt_sigreturn 185endf __vdso_rt_sigreturn 186 187 .cfi_endproc 188