1 //===--------- inline implementation of aarch64 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_AARCH64_SYSCALL_H 10 #define LLVM_LIBC_SRC_SUPPORT_OSUTIL_LINUX_AARCH64_SYSCALL_H 11 12 #include "src/__support/common.h" 13 14 #define REGISTER_DECL_0 \ 15 register long x8 __asm__("x8") = number; \ 16 register long x0 __asm__("x0"); 17 #define REGISTER_DECL_1 \ 18 register long x8 __asm__("x8") = number; \ 19 register long x0 __asm__("x0") = arg1; 20 #define REGISTER_DECL_2 REGISTER_DECL_1 register long x1 __asm__("x1") = arg2; 21 #define REGISTER_DECL_3 \ 22 REGISTER_DECL_2 \ 23 register long x2 __asm__("x2") = arg3; 24 #define REGISTER_DECL_4 \ 25 REGISTER_DECL_3 \ 26 register long x3 __asm__("x3") = arg4; 27 #define REGISTER_DECL_5 \ 28 REGISTER_DECL_4 \ 29 register long x4 __asm__("x4") = arg5; 30 #define REGISTER_DECL_6 \ 31 REGISTER_DECL_5 \ 32 register long x5 __asm__("x5") = arg6; 33 34 #define REGISTER_CONSTRAINT_0 "r"(x8) 35 #define REGISTER_CONSTRAINT_1 REGISTER_CONSTRAINT_0, "r"(x0) 36 #define REGISTER_CONSTRAINT_2 REGISTER_CONSTRAINT_1, "r"(x1) 37 #define REGISTER_CONSTRAINT_3 REGISTER_CONSTRAINT_2, "r"(x2) 38 #define REGISTER_CONSTRAINT_4 REGISTER_CONSTRAINT_3, "r"(x3) 39 #define REGISTER_CONSTRAINT_5 REGISTER_CONSTRAINT_4, "r"(x4) 40 #define REGISTER_CONSTRAINT_6 REGISTER_CONSTRAINT_5, "r"(x5) 41 42 #define SYSCALL_INSTR(input_constraint) \ 43 LIBC_INLINE_ASM("svc 0" : "=r"(x0) : input_constraint : "memory", "cc") 44 45 namespace __llvm_libc { 46 47 __attribute__((always_inline)) inline long syscall(long number) { 48 REGISTER_DECL_0; 49 SYSCALL_INSTR(REGISTER_CONSTRAINT_0); 50 return x0; 51 } 52 53 __attribute__((always_inline)) inline long syscall(long number, long arg1) { 54 REGISTER_DECL_1; 55 SYSCALL_INSTR(REGISTER_CONSTRAINT_1); 56 return x0; 57 } 58 59 __attribute__((always_inline)) inline long syscall(long number, long arg1, 60 long arg2) { 61 REGISTER_DECL_2; 62 SYSCALL_INSTR(REGISTER_CONSTRAINT_2); 63 return x0; 64 } 65 66 __attribute__((always_inline)) inline long syscall(long number, long arg1, 67 long arg2, long arg3) { 68 REGISTER_DECL_3; 69 SYSCALL_INSTR(REGISTER_CONSTRAINT_3); 70 return x0; 71 } 72 73 __attribute__((always_inline)) inline long 74 syscall(long number, long arg1, long arg2, long arg3, long arg4) { 75 REGISTER_DECL_4; 76 SYSCALL_INSTR(REGISTER_CONSTRAINT_4); 77 return x0; 78 } 79 80 __attribute__((always_inline)) inline long 81 syscall(long number, long arg1, long arg2, long arg3, long arg4, long arg5) { 82 REGISTER_DECL_5; 83 SYSCALL_INSTR(REGISTER_CONSTRAINT_5); 84 return x0; 85 } 86 87 __attribute__((always_inline)) inline long syscall(long number, long arg1, 88 long arg2, long arg3, 89 long arg4, long arg5, 90 long arg6) { 91 REGISTER_DECL_6; 92 SYSCALL_INSTR(REGISTER_CONSTRAINT_6); 93 return x0; 94 } 95 96 } // namespace __llvm_libc 97 98 #undef REGISTER_DECL_0 99 #undef REGISTER_DECL_1 100 #undef REGISTER_DECL_2 101 #undef REGISTER_DECL_3 102 #undef REGISTER_DECL_4 103 #undef REGISTER_DECL_5 104 #undef REGISTER_DECL_6 105 106 #undef REGISTER_CONSTRAINT_0 107 #undef REGISTER_CONSTRAINT_1 108 #undef REGISTER_CONSTRAINT_2 109 #undef REGISTER_CONSTRAINT_3 110 #undef REGISTER_CONSTRAINT_4 111 #undef REGISTER_CONSTRAINT_5 112 #undef REGISTER_CONSTRAINT_6 113 114 #endif // LLVM_LIBC_SRC_SUPPORT_OSUTIL_LINUX_AARCH64_SYSCALL_H 115