101 lines
2.7 KiB
C++
101 lines
2.7 KiB
C++
// Copyright 2018 The gVisor Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// System call support for the VDSO.
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//
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// Provides fallback system call interfaces for getcpu()
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// and clock_gettime().
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#ifndef VDSO_SYSCALLS_H_
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#define VDSO_SYSCALLS_H_
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#include <asm/unistd.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stddef.h>
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#include <sys/types.h>
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#define __stringify_1(x...) #x
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#define __stringify(x...) __stringify_1(x)
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namespace vdso {
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#if __x86_64__
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struct getcpu_cache;
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static inline int sys_clock_gettime(clockid_t clock, struct timespec* ts) {
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int num = __NR_clock_gettime;
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asm volatile("syscall\n"
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: "+a"(num)
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: "D"(clock), "S"(ts)
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: "rcx", "r11", "memory");
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return num;
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}
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static inline int sys_getcpu(unsigned* cpu, unsigned* node,
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struct getcpu_cache* cache) {
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int num = __NR_getcpu;
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asm volatile("syscall\n"
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: "+a"(num)
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: "D"(cpu), "S"(node), "d"(cache)
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: "rcx", "r11", "memory");
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return num;
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}
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static inline void sys_rt_sigreturn(void) {
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asm volatile("movl $" __stringify(__NR_rt_sigreturn)", %eax \n"
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"syscall \n");
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}
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#elif __aarch64__
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static inline int sys_clock_gettime(clockid_t _clkid, struct timespec* _ts) {
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register struct timespec* ts asm("x1") = _ts;
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register clockid_t clkid asm("x0") = _clkid;
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register long ret asm("x0");
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register long nr asm("x8") = __NR_clock_gettime;
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asm volatile("svc #0\n"
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: "=r"(ret)
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: "r"(clkid), "r"(ts), "r"(nr)
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: "memory");
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return ret;
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}
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static inline int sys_clock_getres(clockid_t _clkid, struct timespec* _ts) {
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register struct timespec* ts asm("x1") = _ts;
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register clockid_t clkid asm("x0") = _clkid;
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register long ret asm("x0");
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register long nr asm("x8") = __NR_clock_getres;
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asm volatile("svc #0\n"
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: "=r"(ret)
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: "r"(clkid), "r"(ts), "r"(nr)
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: "memory");
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return ret;
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}
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static inline void sys_rt_sigreturn(void) {
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asm volatile("mov x8, #" __stringify(__NR_rt_sigreturn)" \n"
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"svc #0 \n");
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}
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#else
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#error "unsupported architecture"
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#endif
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} // namespace vdso
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#endif // VDSO_SYSCALLS_H_
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