libc/src/__support/OSUtil/darwin/arm/syscall.h

   1 //===------ inline implementation of Darwin arm64 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_DARWIN_ARM_SYSCALL_H
  10 #define LLVM_LIBC_SRC___SUPPORT_OSUTIL_DARWIN_ARM_SYSCALL_H
  11
  12 #include "src/__support/common.h"
  13
  14 #define REGISTER_DECL_0                                                        \
  15   register long x16 __asm__("x16") = number;                                   \
  16   register long x0 __asm__("x0");
  17 #define REGISTER_DECL_1                                                        \
  18   register long x16 __asm__("x16") = number;                                   \
  19   register long x0 __asm__("x0") = arg1;
  20 #define REGISTER_DECL_2                                                        \
  21   REGISTER_DECL_1                                                              \
  22   register long x1 __asm__("x1") = arg2;
  23 #define REGISTER_DECL_3                                                        \
  24   REGISTER_DECL_2                                                              \
  25   register long x2 __asm__("x2") = arg3;
  26 #define REGISTER_DECL_4                                                        \
  27   REGISTER_DECL_3                                                              \
  28   register long x3 __asm__("x3") = arg4;
  29 #define REGISTER_DECL_5                                                        \
  30   REGISTER_DECL_4                                                              \
  31   register long x4 __asm__("x4") = arg5;
  32 #define REGISTER_DECL_6                                                        \
  33   REGISTER_DECL_5                                                              \
  34   register long x5 __asm__("x5") = arg6;
  35
  36 #define REGISTER_CONSTRAINT_0 "r"(x16)
  37 #define REGISTER_CONSTRAINT_1 REGISTER_CONSTRAINT_0, "r"(x0)
  38 #define REGISTER_CONSTRAINT_2 REGISTER_CONSTRAINT_1, "r"(x1)
  39 #define REGISTER_CONSTRAINT_3 REGISTER_CONSTRAINT_2, "r"(x2)
  40 #define REGISTER_CONSTRAINT_4 REGISTER_CONSTRAINT_3, "r"(x3)
  41 #define REGISTER_CONSTRAINT_5 REGISTER_CONSTRAINT_4, "r"(x4)
  42 #define REGISTER_CONSTRAINT_6 REGISTER_CONSTRAINT_5, "r"(x5)
  43
  44 #define SYSCALL_INSTR(input_constraint)                                        \
  45   LIBC_INLINE_ASM("svc 0x80" : "=r"(x0) : input_constraint : "memory", "cc")
  46
  47 namespace LIBC_NAMESPACE {
  48
  49 LIBC_INLINE long syscall_impl(long number) {
  50   REGISTER_DECL_0;
  51   SYSCALL_INSTR(REGISTER_CONSTRAINT_0);
  52   return x0;
  53 }
  54
  55 LIBC_INLINE long syscall_impl(long number, long arg1) {
  56   REGISTER_DECL_1;
  57   SYSCALL_INSTR(REGISTER_CONSTRAINT_1);
  58   return x0;
  59 }
  60
  61 LIBC_INLINE long syscall_impl(long number, long arg1, long arg2) {
  62   REGISTER_DECL_2;
  63   SYSCALL_INSTR(REGISTER_CONSTRAINT_2);
  64   return x0;
  65 }
  66
  67 LIBC_INLINE long syscall_impl(long number, long arg1, long arg2, long arg3) {
  68   REGISTER_DECL_3;
  69   SYSCALL_INSTR(REGISTER_CONSTRAINT_3);
  70   return x0;
  71 }
  72
  73 LIBC_INLINE long syscall_impl(long number, long arg1, long arg2, long arg3,
  74                               long arg4) {
  75   REGISTER_DECL_4;
  76   SYSCALL_INSTR(REGISTER_CONSTRAINT_4);
  77   return x0;
  78 }
  79
  80 LIBC_INLINE long syscall_impl(long number, long arg1, long arg2, long arg3,
  81                               long arg4, long arg5) {
  82   REGISTER_DECL_5;
  83   SYSCALL_INSTR(REGISTER_CONSTRAINT_5);
  84   return x0;
  85 }
  86
  87 LIBC_INLINE long syscall_impl(long number, long arg1, long arg2, long arg3,
  88                               long arg4, long arg5, long arg6) {
  89   REGISTER_DECL_6;
  90   SYSCALL_INSTR(REGISTER_CONSTRAINT_6);
  91   return x0;
  92 }
  93
  94 } // namespace LIBC_NAMESPACE
  95
  96 #undef REGISTER_DECL_0
  97 #undef REGISTER_DECL_1
  98 #undef REGISTER_DECL_2
  99 #undef REGISTER_DECL_3
 100 #undef REGISTER_DECL_4
 101 #undef REGISTER_DECL_5
 102 #undef REGISTER_DECL_6
 103
 104 #undef REGISTER_CONSTRAINT_0
 105 #undef REGISTER_CONSTRAINT_1
 106 #undef REGISTER_CONSTRAINT_2
 107 #undef REGISTER_CONSTRAINT_3
 108 #undef REGISTER_CONSTRAINT_4
 109 #undef REGISTER_CONSTRAINT_5
 110 #undef REGISTER_CONSTRAINT_6
 111
 112 #endif // LLVM_LIBC_SRC___SUPPORT_OSUTIL_DARWIN_ARM_SYSCALL_H