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Siva Chandra
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[libc] Add linux aarch64 syscall implementation.
Add mmap and munmap to the linux aarch64 entrypoint list as the first user of these syscalls. Reviewed By: michaelrj Differential Revision: https://reviews.llvm.org/D116949
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‎libc/config/linux/aarch64/entrypoints.txt

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@@ -171,6 +171,14 @@ set(TARGET_LIBM_ENTRYPOINTS
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libc.src.math.truncl
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)
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if(LLVM_LIBC_FULL_BUILD)
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list(APPEND TARGET_LIBC_ENTRYPOINTS
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# sys/mman.h entrypoints
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libc.src.sys.mman.mmap
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libc.src.sys.mman.munmap
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)
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endif()
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set(TARGET_LLVMLIBC_ENTRYPOINTS
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${TARGET_LIBC_ENTRYPOINTS}
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${TARGET_LIBM_ENTRYPOINTS}

‎libc/src/__support/OSUtil/linux/CMakeLists.txt

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@@ -1,3 +1,4 @@
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add_subdirectory(aarch64)
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add_subdirectory(x86_64)
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add_header_library(
@@ -7,6 +8,7 @@ add_header_library(
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quick_exit.h
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syscall.h
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DEPENDS
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.aarch64.linux_aarch64_util
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.x86_64.linux_x86_64_util
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libc.src.__support.common
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)

‎libc/src/__support/OSUtil/linux/aarch64/CMakeLists.txt

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add_header_library(
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linux_aarch64_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/linux/aarch64/syscall.h

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//===--------- inline implementation of aarch64 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_LINUX_AARCH64_SYSCALL_H
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#define LLVM_LIBC_SRC_SUPPORT_OSUTIL_LINUX_AARCH64_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 x8 __asm__("x8") = number; \
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register long x0 __asm__("x0");
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#define REGISTER_DECL_1 \
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register long x8 __asm__("x8") = number; \
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register long x0 __asm__("x0") = arg1;
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#define REGISTER_DECL_2 REGISTER_DECL_1 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"(x8)
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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 0" : "=r"(x0) : input_constraint : "memory", "cc")
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namespace __llvm_libc {
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__attribute__((always_inline)) inline long syscall(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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__attribute__((always_inline)) inline long syscall(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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__attribute__((always_inline)) inline long syscall(long number, long arg1,
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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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__attribute__((always_inline)) inline long syscall(long number, long arg1,
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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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__attribute__((always_inline)) inline long
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syscall(long number, long arg1, long arg2, long arg3, 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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__attribute__((always_inline)) inline long
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syscall(long number, long arg1, long arg2, long arg3, 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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__attribute__((always_inline)) inline long syscall(long number, long arg1,
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long arg2, long arg3,
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long arg4, long arg5,
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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_LINUX_AARCH64_SYSCALL_H

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

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@@ -13,6 +13,18 @@
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#ifdef LLVM_LIBC_ARCH_X86_64
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#include "x86_64/syscall.h"
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#elif defined(LLVM_LIBC_ARCH_AARCH64)
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#include "aarch64/syscall.h"
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#endif
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namespace __llvm_libc {
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template <typename... Ts>
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__attribute__((always_inline)) inline long syscall(long __number, Ts... ts) {
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static_assert(sizeof...(Ts) <= 6, "Too many arguments for syscall");
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return syscall(__number, (long)ts...);
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}
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} // namespace __llvm_libc
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#endif // LLVM_LIBC_SRC_SUPPORT_OSUTIL_LINUX_SYSCALL_H

‎libc/src/__support/OSUtil/linux/x86_64/syscall.h

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@@ -95,12 +95,6 @@ __attribute__((always_inline)) inline long syscall(long __number, long __arg1,
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return retcode;
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}
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template <typename... Ts>
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__attribute__((always_inline)) inline long syscall(long __number, Ts... ts) {
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static_assert(sizeof...(Ts) <= 6, "Too many arguments for syscall");
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return syscall(__number, (long)ts...);
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}
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#undef SYSCALL_CLOBBER_LIST
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} // namespace __llvm_libc

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