libc/src/__support/OSUtil/linux/x86_64/syscall.h

   1 //===---------- inline implementation of x86_64 syscalls ----------* C++ *-===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #ifndef LLVM_LIBC_SRC___SUPPORT_OSUTIL_LINUX_X86_64_SYSCALL_H
  10 #define LLVM_LIBC_SRC___SUPPORT_OSUTIL_LINUX_X86_64_SYSCALL_H
  11
  12 #include "src/__support/common.h"
  13
  14 #define SYSCALL_CLOBBER_LIST "rcx", "r11", "memory"
  15
  16 namespace LIBC_NAMESPACE {
  17
  18 LIBC_INLINE long syscall_impl(long __number) {
  19   long retcode;
  20   LIBC_INLINE_ASM("syscall"
  21                   : "=a"(retcode)
  22                   : "a"(__number)
  23                   : SYSCALL_CLOBBER_LIST);
  24   return retcode;
  25 }
  26
  27 LIBC_INLINE long syscall_impl(long __number, long __arg1) {
  28   long retcode;
  29   LIBC_INLINE_ASM("syscall"
  30                   : "=a"(retcode)
  31                   : "a"(__number), "D"(__arg1)
  32                   : SYSCALL_CLOBBER_LIST);
  33   return retcode;
  34 }
  35
  36 LIBC_INLINE long syscall_impl(long __number, long __arg1, long __arg2) {
  37   long retcode;
  38   LIBC_INLINE_ASM("syscall"
  39                   : "=a"(retcode)
  40                   : "a"(__number), "D"(__arg1), "S"(__arg2)
  41                   : SYSCALL_CLOBBER_LIST);
  42   return retcode;
  43 }
  44
  45 LIBC_INLINE long syscall_impl(long __number, long __arg1, long __arg2,
  46                               long __arg3) {
  47   long retcode;
  48   LIBC_INLINE_ASM("syscall"
  49                   : "=a"(retcode)
  50                   : "a"(__number), "D"(__arg1), "S"(__arg2), "d"(__arg3)
  51                   : SYSCALL_CLOBBER_LIST);
  52   return retcode;
  53 }
  54
  55 LIBC_INLINE long syscall_impl(long __number, long __arg1, long __arg2,
  56                               long __arg3, long __arg4) {
  57   long retcode;
  58   register long r10 __asm__("r10") = __arg4;
  59   LIBC_INLINE_ASM("syscall"
  60                   : "=a"(retcode)
  61                   : "a"(__number), "D"(__arg1), "S"(__arg2), "d"(__arg3),
  62                     "r"(r10)
  63                   : SYSCALL_CLOBBER_LIST);
  64   return retcode;
  65 }
  66
  67 LIBC_INLINE long syscall_impl(long __number, long __arg1, long __arg2,
  68                               long __arg3, long __arg4, long __arg5) {
  69   long retcode;
  70   register long r10 __asm__("r10") = __arg4;
  71   register long r8 __asm__("r8") = __arg5;
  72   LIBC_INLINE_ASM("syscall"
  73                   : "=a"(retcode)
  74                   : "a"(__number), "D"(__arg1), "S"(__arg2), "d"(__arg3),
  75                     "r"(r10), "r"(r8)
  76                   : SYSCALL_CLOBBER_LIST);
  77   return retcode;
  78 }
  79
  80 LIBC_INLINE long syscall_impl(long __number, long __arg1, long __arg2,
  81                               long __arg3, long __arg4, long __arg5,
  82                               long __arg6) {
  83   long retcode;
  84   register long r10 __asm__("r10") = __arg4;
  85   register long r8 __asm__("r8") = __arg5;
  86   register long r9 __asm__("r9") = __arg6;
  87   LIBC_INLINE_ASM("syscall"
  88                   : "=a"(retcode)
  89                   : "a"(__number), "D"(__arg1), "S"(__arg2), "d"(__arg3),
  90                     "r"(r10), "r"(r8), "r"(r9)
  91                   : SYSCALL_CLOBBER_LIST);
  92   return retcode;
  93 }
  94
  95 #undef SYSCALL_CLOBBER_LIST
  96 } // namespace LIBC_NAMESPACE
  97
  98 #endif // LLVM_LIBC_SRC___SUPPORT_OSUTIL_LINUX_X86_64_SYSCALL_H