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[libc][darwin] Add OSUtil for darwin arm64 target so that unit tests can be run.
Currently unit tests cannot be run on macOS due to missing OSUtil. Reviewed By: michaelrj Differential Revision: https://reviews.llvm.org/D151377
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‎libc/src/__support/OSUtil/darwin/CMakeLists.txt

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if(NOT EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/${LIBC_TARGET_ARCHITECTURE})
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return()
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endif()
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add_subdirectory(${LIBC_TARGET_ARCHITECTURE})
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add_header_library(
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darwin_util
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HDRS
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io.h
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quick_exit.h
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syscall.h
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DEPENDS
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.${LIBC_TARGET_ARCHITECTURE}.darwin_util
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libc.src.__support.common
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libc.src.__support.CPP.string_view
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)

‎libc/src/__support/OSUtil/darwin/arm/CMakeLists.txt

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add_header_library(
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darwin_util
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HDRS
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syscall.h
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DEPENDS
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libc.src.__support.common
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)

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

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//===------ inline implementation of Darwin arm64 syscalls --------* C++ *-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIBC_SRC_SUPPORT_OSUTIL_DARWIN_ARM_SYSCALL_H
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#define LLVM_LIBC_SRC_SUPPORT_OSUTIL_DARWIN_ARM_SYSCALL_H
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#include "src/__support/common.h"
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#define REGISTER_DECL_0 \
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register long x16 __asm__("x16") = number; \
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register long x0 __asm__("x0");
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#define REGISTER_DECL_1 \
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register long x16 __asm__("x16") = number; \
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register long x0 __asm__("x0") = arg1;
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#define REGISTER_DECL_2 \
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REGISTER_DECL_1 \
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register long x1 __asm__("x1") = arg2;
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#define REGISTER_DECL_3 \
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REGISTER_DECL_2 \
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register long x2 __asm__("x2") = arg3;
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#define REGISTER_DECL_4 \
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REGISTER_DECL_3 \
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register long x3 __asm__("x3") = arg4;
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#define REGISTER_DECL_5 \
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REGISTER_DECL_4 \
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register long x4 __asm__("x4") = arg5;
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#define REGISTER_DECL_6 \
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REGISTER_DECL_5 \
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register long x5 __asm__("x5") = arg6;
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#define REGISTER_CONSTRAINT_0 "r"(x16)
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#define REGISTER_CONSTRAINT_1 REGISTER_CONSTRAINT_0, "r"(x0)
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#define REGISTER_CONSTRAINT_2 REGISTER_CONSTRAINT_1, "r"(x1)
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#define REGISTER_CONSTRAINT_3 REGISTER_CONSTRAINT_2, "r"(x2)
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#define REGISTER_CONSTRAINT_4 REGISTER_CONSTRAINT_3, "r"(x3)
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#define REGISTER_CONSTRAINT_5 REGISTER_CONSTRAINT_4, "r"(x4)
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#define REGISTER_CONSTRAINT_6 REGISTER_CONSTRAINT_5, "r"(x5)
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#define SYSCALL_INSTR(input_constraint) \
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LIBC_INLINE_ASM("svc 0x80" : "=r"(x0) : input_constraint : "memory", "cc")
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namespace __llvm_libc {
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LIBC_INLINE long syscall_impl(long number) {
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REGISTER_DECL_0;
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SYSCALL_INSTR(REGISTER_CONSTRAINT_0);
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return x0;
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}
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LIBC_INLINE long syscall_impl(long number, long arg1) {
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REGISTER_DECL_1;
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SYSCALL_INSTR(REGISTER_CONSTRAINT_1);
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return x0;
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}
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LIBC_INLINE long syscall_impl(long number, long arg1, long arg2) {
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REGISTER_DECL_2;
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SYSCALL_INSTR(REGISTER_CONSTRAINT_2);
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return x0;
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}
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LIBC_INLINE long syscall_impl(long number, long arg1, long arg2, long arg3) {
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REGISTER_DECL_3;
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SYSCALL_INSTR(REGISTER_CONSTRAINT_3);
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return x0;
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}
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LIBC_INLINE long syscall_impl(long number, long arg1, long arg2, long arg3,
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long arg4) {
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REGISTER_DECL_4;
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SYSCALL_INSTR(REGISTER_CONSTRAINT_4);
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return x0;
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}
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LIBC_INLINE long syscall_impl(long number, long arg1, long arg2, long arg3,
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long arg4, long arg5) {
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REGISTER_DECL_5;
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SYSCALL_INSTR(REGISTER_CONSTRAINT_5);
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return x0;
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}
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LIBC_INLINE long syscall_impl(long number, long arg1, long arg2, long arg3,
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long arg4, long arg5, long arg6) {
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REGISTER_DECL_6;
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SYSCALL_INSTR(REGISTER_CONSTRAINT_6);
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return x0;
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}
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} // namespace __llvm_libc
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#undef REGISTER_DECL_0
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#undef REGISTER_DECL_1
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#undef REGISTER_DECL_2
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#undef REGISTER_DECL_3
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#undef REGISTER_DECL_4
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#undef REGISTER_DECL_5
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#undef REGISTER_DECL_6
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#undef REGISTER_CONSTRAINT_0
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#undef REGISTER_CONSTRAINT_1
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#undef REGISTER_CONSTRAINT_2
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#undef REGISTER_CONSTRAINT_3
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#undef REGISTER_CONSTRAINT_4
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#undef REGISTER_CONSTRAINT_5
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#undef REGISTER_CONSTRAINT_6
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#endif // LLVM_LIBC_SRC_SUPPORT_OSUTIL_DARWIN_ARM_SYSCALL_H

‎libc/src/__support/OSUtil/darwin/io.h

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//===------------- Darwin implementation of IO utils ------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIBC_SRC_SUPPORT_OSUTIL_DARWIN_IO_H
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#define LLVM_LIBC_SRC_SUPPORT_OSUTIL_DARWIN_IO_H
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#include "src/__support/CPP/string_view.h"
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#include "syscall.h" // For internal syscall function.
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namespace __llvm_libc {
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LIBC_INLINE void write_to_stderr(cpp::string_view msg) {
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__llvm_libc::syscall_impl(4 /*SYS_write*/, 2 /* stderr */,
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reinterpret_cast<long>(msg.data()), msg.size());
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}
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} // namespace __llvm_libc
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#endif // LLVM_LIBC_SRC_SUPPORT_OSUTIL_DARWIN_IO_H

‎libc/src/__support/OSUtil/darwin/quick_exit.h

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//===--------- Darwin implementation of a quick exit function ---*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIBC_SRC_SUPPORT_OSUTIL_DARWIN_QUICK_EXIT_H
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#define LLVM_LIBC_SRC_SUPPORT_OSUTIL_DARWIN_QUICK_EXIT_H
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#include "syscall.h" // For internal syscall function.
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#include "src/__support/common.h"
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namespace __llvm_libc {
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LIBC_INLINE void quick_exit(int status) {
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for (;;) {
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__llvm_libc::syscall_impl(1 /* SYS_exit */, status);
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}
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}
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} // namespace __llvm_libc
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#endif // LLVM_LIBC_SRC_SUPPORT_OSUTIL_DARWIN_QUICK_EXIT_H

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

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//===---------------------- Darwin syscalls ---------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIBC_SRC_SUPPORT_OSUTIL_DARWIN_SYSCALL_H
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#define LLVM_LIBC_SRC_SUPPORT_OSUTIL_DARWIN_SYSCALL_H
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#include "src/__support/common.h"
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#include "src/__support/macros/properties/architectures.h"
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#ifdef LIBC_TARGET_ARCH_IS_ANY_ARM
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#include "arm/syscall.h"
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#else
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#error "Unsupported architecture"
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#endif
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namespace __llvm_libc {
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template <typename... Ts>
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LIBC_INLINE long syscall_impl(long __number, Ts... ts) {
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static_assert(sizeof...(Ts) <= 6, "Too many arguments for syscall");
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return syscall_impl(__number, (long)ts...);
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}
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} // namespace __llvm_libc
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#endif // LLVM_LIBC_SRC_SUPPORT_OSUTIL_DARWIN_SYSCALL_H

‎libc/src/__support/OSUtil/io.h

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#if defined(LIBC_TARGET_ARCH_IS_GPU)
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#include "gpu/io.h"
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#elif defined(__APPLE__)
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#include "darwin/io.h"
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#elif defined(__unix__)
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#include "linux/io.h"
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#elif defined(__Fuchsia__)

‎libc/src/__support/OSUtil/quick_exit.h

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#if defined(LIBC_TARGET_ARCH_IS_GPU)
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#include "gpu/quick_exit.h"
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#elif defined(__APPLE__)
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#include "darwin/quick_exit.h"
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#elif defined(__unix__)
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#include "linux/quick_exit.h"
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#endif

‎libc/src/__support/OSUtil/syscall.h

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#ifndef LLVM_LIBC_SRC_SUPPORT_OSUTIL_SYSCALL_H
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#define LLVM_LIBC_SRC_SUPPORT_OSUTIL_SYSCALL_H
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#ifdef __unix__
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#ifdef __APPLE__
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#include "darwin/syscall.h"
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#elif defined(__unix__)
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#include "linux/syscall.h"
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#endif
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