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