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//===---------- Linux implementation of the Linux pkey_mprotect function --===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "src/sys/mman/pkey_mprotect.h"
#include "hdr/errno_macros.h" // For ENOSYS
#include "hdr/types/size_t.h"
#include "src/__support/OSUtil/syscall.h" // For internal syscall function.
#include "src/__support/common.h"
#include "src/__support/error_or.h"
#include "src/__support/libc_errno.h"
#include "src/__support/macros/config.h"
#include "src/sys/mman/linux/mprotect_common.h"
#include <sys/syscall.h> // For syscall numbers.
namespace LIBC_NAMESPACE_DECL {
namespace internal {
LIBC_INLINE ErrorOr<int> pkey_mprotect_impl(void *addr, size_t len, int prot,
int pkey) {
// Fall back to mprotect if pkey is -1
// to maintain compatibility with kernel versions that don't support pkey.
if (pkey == -1) {
return LIBC_NAMESPACE::mprotect_common::mprotect_impl(addr, len, prot);
}
#if !defined(SYS_pkey_mprotect)
return Error(ENOSYS);
#else
int ret = LIBC_NAMESPACE::syscall_impl<int>(SYS_pkey_mprotect, addr, len,
prot, pkey);
if (ret < 0) {
return Error(-ret);
}
return 0;
#endif
}
} // namespace internal
LLVM_LIBC_FUNCTION(int, pkey_mprotect,
(void *addr, size_t len, int prot, int pkey)) {
ErrorOr<int> ret =
LIBC_NAMESPACE::internal::pkey_mprotect_impl(addr, len, prot, pkey);
if (!ret.has_value()) {
libc_errno = ret.error();
return -1;
}
return ret.value();
}
} // namespace LIBC_NAMESPACE_DECL
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