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 #include "src/__support/macros/config.h"
  14
  15 #define SYSCALL_CLOBBER_LIST "rcx", "r11", "memory"
  16
  17 namespace LIBC_NAMESPACE_DECL {
  18
  19 LIBC_INLINE long syscall_impl(long __number) {
  20   long retcode;
  21   LIBC_INLINE_ASM("syscall"
  22                   : "=a"(retcode)
  23                   : "a"(__number)
  24                   : SYSCALL_CLOBBER_LIST);
  25   return retcode;
  26 }
  27
  28 LIBC_INLINE long syscall_impl(long __number, long __arg1) {
  29   long retcode;
  30   LIBC_INLINE_ASM("syscall"
  31                   : "=a"(retcode)
  32                   : "a"(__number), "D"(__arg1)
  33                   : SYSCALL_CLOBBER_LIST);
  34   return retcode;
  35 }
  36
  37 LIBC_INLINE long syscall_impl(long __number, long __arg1, long __arg2) {
  38   long retcode;
  39   LIBC_INLINE_ASM("syscall"
  40                   : "=a"(retcode)
  41                   : "a"(__number), "D"(__arg1), "S"(__arg2)
  42                   : SYSCALL_CLOBBER_LIST);
  43   return retcode;
  44 }
  45
  46 LIBC_INLINE long syscall_impl(long __number, long __arg1, long __arg2,
  47                               long __arg3) {
  48   long retcode;
  49   LIBC_INLINE_ASM("syscall"
  50                   : "=a"(retcode)
  51                   : "a"(__number), "D"(__arg1), "S"(__arg2), "d"(__arg3)
  52                   : SYSCALL_CLOBBER_LIST);
  53   return retcode;
  54 }
  55
  56 LIBC_INLINE long syscall_impl(long __number, long __arg1, long __arg2,
  57                               long __arg3, long __arg4) {
  58   long retcode;
  59   register long r10 __asm__("r10") = __arg4;
  60   LIBC_INLINE_ASM("syscall"
  61                   : "=a"(retcode)
  62                   : "a"(__number), "D"(__arg1), "S"(__arg2), "d"(__arg3),
  63                     "r"(r10)
  64                   : SYSCALL_CLOBBER_LIST);
  65   return retcode;
  66 }
  67
  68 LIBC_INLINE long syscall_impl(long __number, long __arg1, long __arg2,
  69                               long __arg3, long __arg4, long __arg5) {
  70   long retcode;
  71   register long r10 __asm__("r10") = __arg4;
  72   register long r8 __asm__("r8") = __arg5;
  73   LIBC_INLINE_ASM("syscall"
  74                   : "=a"(retcode)
  75                   : "a"(__number), "D"(__arg1), "S"(__arg2), "d"(__arg3),
  76                     "r"(r10), "r"(r8)
  77                   : SYSCALL_CLOBBER_LIST);
  78   return retcode;
  79 }
  80
  81 LIBC_INLINE long syscall_impl(long __number, long __arg1, long __arg2,
  82                               long __arg3, long __arg4, long __arg5,
  83                               long __arg6) {
  84   long retcode;
  85   register long r10 __asm__("r10") = __arg4;
  86   register long r8 __asm__("r8") = __arg5;
  87   register long r9 __asm__("r9") = __arg6;
  88   LIBC_INLINE_ASM("syscall"
  89                   : "=a"(retcode)
  90                   : "a"(__number), "D"(__arg1), "S"(__arg2), "d"(__arg3),
  91                     "r"(r10), "r"(r8), "r"(r9)
  92                   : SYSCALL_CLOBBER_LIST);
  93   return retcode;
  94 }
  95
  96 #undef SYSCALL_CLOBBER_LIST
  97 } // namespace LIBC_NAMESPACE_DECL
  98
  99 #endif // LLVM_LIBC_SRC___SUPPORT_OSUTIL_LINUX_X86_64_SYSCALL_H