1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2011 Richard Weinberger <richrd@nod.at> 4 * 5 * This vDSO turns all calls into a syscall so that UML can trap them. 6 */ 7 8 9 /* Disable profiling for userspace code */ 10 #define DISABLE_BRANCH_PROFILING 11 12 #include <linux/time.h> 13 #include <linux/getcpu.h> 14 #include <asm/unistd.h> 15 16 int __vdso_clock_gettime(clockid_t clock, struct __kernel_old_timespec *ts) 17 { 18 long ret; 19 20 asm("syscall" : "=a" (ret) : 21 "0" (__NR_clock_gettime), "D" (clock), "S" (ts) : "memory"); 22 23 return ret; 24 } 25 int clock_gettime(clockid_t, struct __kernel_old_timespec *) 26 __attribute__((weak, alias("__vdso_clock_gettime"))); 27 28 int __vdso_gettimeofday(struct __kernel_old_timeval *tv, struct timezone *tz) 29 { 30 long ret; 31 32 asm("syscall" : "=a" (ret) : 33 "0" (__NR_gettimeofday), "D" (tv), "S" (tz) : "memory"); 34 35 return ret; 36 } 37 int gettimeofday(struct __kernel_old_timeval *, struct timezone *) 38 __attribute__((weak, alias("__vdso_gettimeofday"))); 39 40 __kernel_old_time_t __vdso_time(__kernel_old_time_t *t) 41 { 42 long secs; 43 44 asm volatile("syscall" 45 : "=a" (secs) 46 : "0" (__NR_time), "D" (t) : "cc", "r11", "cx", "memory"); 47 48 return secs; 49 } 50 __kernel_old_time_t time(__kernel_old_time_t *t) __attribute__((weak, alias("__vdso_time"))); 51 52 long 53 __vdso_getcpu(unsigned *cpu, unsigned *node, struct getcpu_cache *unused) 54 { 55 /* 56 * UML does not support SMP, we can cheat here. :) 57 */ 58 59 if (cpu) 60 *cpu = 0; 61 if (node) 62 *node = 0; 63 64 return 0; 65 } 66 67 long getcpu(unsigned *cpu, unsigned *node, struct getcpu_cache *tcache) 68 __attribute__((weak, alias("__vdso_getcpu"))); 69