llvm-project

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//===-- sanitizer_syscall_linux_x86_64.inc ----------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// Implementations of internal_syscall and internal_iserror for Linux/x86_64.
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//
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//===----------------------------------------------------------------------===//
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#define SYSCALL(name) __NR_ ## name
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static uptr internal_syscall(u64 nr) {
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  u64 retval;
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  asm volatile("syscall" : "=a"(retval) : "a"(nr) : "rcx", "r11",
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               "memory", "cc");
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  return retval;
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}
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template <typename T1>
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static uptr internal_syscall(u64 nr, T1 arg1) {
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  u64 retval;
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  asm volatile("syscall" : "=a"(retval) : "a"(nr), "D"((u64)arg1) :
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               "rcx", "r11", "memory", "cc");
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  return retval;
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}
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template <typename T1, typename T2>
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static uptr internal_syscall(u64 nr, T1 arg1, T2 arg2) {
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  u64 retval;
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  asm volatile("syscall" : "=a"(retval) : "a"(nr), "D"((u64)arg1),
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               "S"((u64)arg2) : "rcx", "r11", "memory", "cc");
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  return retval;
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}
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template <typename T1, typename T2, typename T3>
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static uptr internal_syscall(u64 nr, T1 arg1, T2 arg2, T3 arg3) {
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  u64 retval;
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  asm volatile("syscall" : "=a"(retval) : "a"(nr), "D"((u64)arg1),
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               "S"((u64)arg2), "d"((u64)arg3) : "rcx", "r11", "memory", "cc");
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  return retval;
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}
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template <typename T1, typename T2, typename T3, typename T4>
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static uptr internal_syscall(u64 nr, T1 arg1, T2 arg2, T3 arg3, T4 arg4) {
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  u64 retval;
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  asm volatile("mov %5, %%r10;"
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               "syscall" : "=a"(retval) : "a"(nr), "D"((u64)arg1),
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               "S"((u64)arg2), "d"((u64)arg3), "r"((u64)arg4) :
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               "rcx", "r11", "r10", "memory", "cc");
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  return retval;
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}
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template <typename T1, typename T2, typename T3, typename T4, typename T5>
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static uptr internal_syscall(u64 nr, T1 arg1, T2 arg2, T3 arg3, T4 arg4,
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                             T5 arg5) {
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  u64 retval;
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  asm volatile("mov %5, %%r10;"
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               "mov %6, %%r8;"
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               "syscall" : "=a"(retval) : "a"(nr), "D"((u64)arg1),
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               "S"((u64)arg2), "d"((u64)arg3), "r"((u64)arg4), "r"((u64)arg5) :
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               "rcx", "r11", "r10", "r8", "memory", "cc");
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  return retval;
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}
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template <typename T1, typename T2, typename T3, typename T4, typename T5,
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          typename T6>
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static uptr internal_syscall(u64 nr, T1 arg1, T2 arg2, T3 arg3, T4 arg4,
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                             T5 arg5, T6 arg6) {
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  u64 retval;
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  asm volatile("mov %5, %%r10;"
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               "mov %6, %%r8;"
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               "mov %7, %%r9;"
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               "syscall" : "=a"(retval) : "a"(nr), "D"((u64)arg1),
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               "S"((u64)arg2), "d"((u64)arg3), "r"((u64)arg4), "r"((u64)arg5),
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               "r"((u64)arg6) : "rcx", "r11", "r10", "r8", "r9",
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               "memory", "cc");
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  return retval;
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}
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bool internal_iserror(uptr retval, int *rverrno) {
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  if (retval >= (uptr)-4095) {
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    if (rverrno)
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      *rverrno = -retval;
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    return true;
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  }
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  return false;
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}
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