bits/mman.h: consolidate header file

Sync with GNU C library and consolidate duplicate non
architecture specific defines.
MAP_UNINITIALIZED is only defined to 0x4000000 and used by
the Linux kernel when CONFIG_MMAP_ALLOW_UNINITIALIZED is enabled.
CONFIG_MMAP_ALLOW_UNINITIALIZED is only available for nommu.
See Documentation/nommu-mmap.txt.

3 files changed, 196 insertions, 76 deletions

diff --git a/libc/sysdeps/linux/common/bits/mman-common.h b/libc/sysdeps/linux/common/bits/mman-common.h
index 5b20da4d0..ddd03a8d3 100644
--- a/libc/sysdeps/linux/common/bits/mman-common.h
+++ b/libc/sysdeps/linux/common/bits/mman-common.h
@@ -1,6 +1,5 @@
 /* Definitions for POSIX memory map interface.  Linux/generic version.
-   Copyright (C) 1997,2000,2003,2005,2006,2009 Free Software Foundation, Inc.
-   This file is part of the GNU C Library.
+   Copyright (C) 1997-2018 Free Software Foundation, Inc.
 
    The GNU C Library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
@@ -23,36 +22,6 @@
 /* The following definitions basically come from the kernel headers.
    But the kernel header is not namespace clean.  */
 
-
-/* Protections are chosen from these bits, OR'd together.  The
-   implementation does not necessarily support PROT_EXEC or PROT_WRITE
-   without PROT_READ.  The only guarantees are that no writing will be
-   allowed without PROT_WRITE and no access will be allowed for PROT_NONE. */
-
-#define PROT_READ	0x1		/* Page can be read.  */
-#define PROT_WRITE	0x2		/* Page can be written.  */
-#define PROT_EXEC	0x4		/* Page can be executed.  */
-#define PROT_NONE	0x0		/* Page can not be accessed.  */
-#define PROT_GROWSDOWN	0x01000000	/* Extend change to start of
-					   growsdown vma (mprotect only).  */
-#define PROT_GROWSUP	0x02000000	/* Extend change to start of
-					   growsup vma (mprotect only).  */
-
-/* Sharing types (must choose one and only one of these).  */
-#define MAP_SHARED	0x01		/* Share changes.  */
-#define MAP_PRIVATE	0x02		/* Changes are private.  */
-#ifdef __USE_MISC
-# define MAP_TYPE	0x0f		/* Mask for type of mapping.  */
-#endif
-
-/* Other flags.  */
-#define MAP_FIXED	0x10		/* Interpret addr exactly.  */
-#ifdef __USE_MISC
-# define MAP_FILE	0
-# define MAP_ANONYMOUS	0x20		/* Don't use a file.  */
-# define MAP_ANON	MAP_ANONYMOUS
-#endif
-
 /* These are Linux-specific.  */
 #ifdef __USE_MISC
 # define MAP_GROWSDOWN	0x00100		/* Stack-like segment.  */
@@ -63,49 +32,8 @@
 # define MAP_POPULATE	0x08000		/* Populate (prefault) pagetables.  */
 # define MAP_NONBLOCK	0x10000		/* Do not block on IO.  */
 # define MAP_STACK	0x20000		/* Allocation is for a stack.  */
-# define MAP_UNINITIALIZED 0x4000000    /* For anonymous mmap, memory could
-					   be uninitialized. */
+# define MAP_HUGETLB	0x40000		/* Create huge page mapping.  */
+# define MAP_UNINITIALIZED 0x4000000    /* For anonymous mmap, memory could -   					   be uninitialized. */
 #endif
 
-/* Flags to `msync'.  */
-#define MS_ASYNC	1		/* Sync memory asynchronously.  */
-#define MS_SYNC		4		/* Synchronous memory sync.  */
-#define MS_INVALIDATE	2		/* Invalidate the caches.  */
-
-/* Flags for `mlockall'.  */
-#define MCL_CURRENT	1		/* Lock all currently mapped pages.  */
-#define MCL_FUTURE	2		/* Lock all additions to address
-					   space.  */
-
-/* Flags for `mremap'.  */
-#ifdef __USE_GNU
-# define MREMAP_MAYMOVE	1
-# define MREMAP_FIXED	2
-#endif
-
-/* only define for MMU targets, no-MMU does not support madvise.  */
-#ifdef __ARCH_USE_MMU__
-/* Advice to `madvise'.  */
-# ifdef __USE_BSD
-#  define MADV_NORMAL	  0	/* No further special treatment.  */
-#  define MADV_RANDOM	  1	/* Expect random page references.  */
-#  define MADV_SEQUENTIAL 2	/* Expect sequential page references.  */
-#  define MADV_WILLNEED	  3	/* Will need these pages.  */
-#  define MADV_DONTNEED	  4	/* Don't need these pages.  */
-#  define MADV_REMOVE	  9	/* Remove these pages and resources.  */
-#  define MADV_DONTFORK	  10	/* Do not inherit across fork.  */
-#  define MADV_DOFORK	  11	/* Do inherit across fork.  */
-#  define MADV_MERGEABLE  12	/* KSM may merge identical pages.  */
-#  define MADV_UNMERGEABLE 13	/* KSM may not merge identical pages.  */
-#  define MADV_HWPOISON	  100	/* Poison a page for testing.  */
-# endif
-
-/* The POSIX people had to invent similar names for the same things.  */
-# ifdef __USE_XOPEN2K
-#  define POSIX_MADV_NORMAL	0 /* No further special treatment.  */
-#  define POSIX_MADV_RANDOM	1 /* Expect random page references.  */
-#  define POSIX_MADV_SEQUENTIAL	2 /* Expect sequential page references.  */
-#  define POSIX_MADV_WILLNEED	3 /* Will need these pages.  */
-#  define POSIX_MADV_DONTNEED	4 /* Don't need these pages.  */
-# endif
-#endif
+#include <bits/mman-linux.h>
diff --git a/libc/sysdeps/linux/common/bits/mman-linux.h b/libc/sysdeps/linux/common/bits/mman-linux.h
new file mode 100644
index 000000000..6ca08415a
--- /dev/null
+++ b/libc/sysdeps/linux/common/bits/mman-linux.h
@@ -0,0 +1,117 @@
+/* Definitions for POSIX memory map interface.  Linux generic version.
+   Copyright (C) 2001-2018 Free Software Foundation, Inc.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef _SYS_MMAN_H
+# error "Never use <bits/mman-linux.h> directly; include <sys/mman.h> instead."
+#endif
+
+/* The following definitions basically come from the kernel headers.
+   But the kernel header is not namespace clean.  */
+
+
+/* Protections are chosen from these bits, OR'd together.  The
+   implementation does not necessarily support PROT_EXEC or PROT_WRITE
+   without PROT_READ.  The only guarantees are that no writing will be
+   allowed without PROT_WRITE and no access will be allowed for PROT_NONE. */
+
+#define PROT_READ	0x1		/* Page can be read.  */
+#define PROT_WRITE	0x2		/* Page can be written.  */
+#define PROT_EXEC	0x4		/* Page can be executed.  */
+#define PROT_NONE	0x0		/* Page can not be accessed.  */
+#define PROT_GROWSDOWN	0x01000000	/* Extend change to start of
+					   growsdown vma (mprotect only).  */
+#define PROT_GROWSUP	0x02000000	/* Extend change to start of
+					   growsup vma (mprotect only).  */
+
+/* Sharing types (must choose one and only one of these).  */
+#define MAP_SHARED	0x01		/* Share changes.  */
+#define MAP_PRIVATE	0x02		/* Changes are private.  */
+#ifdef __USE_MISC
+# define MAP_TYPE	0x0f		/* Mask for type of mapping.  */
+#endif
+
+/* Other flags.  */
+#define MAP_FIXED	0x10		/* Interpret addr exactly.  */
+#ifdef __USE_MISC
+# define MAP_FILE	0
+# ifdef __MAP_ANONYMOUS
+#  define MAP_ANONYMOUS	__MAP_ANONYMOUS	/* Don't use a file.  */
+# else
+#  define MAP_ANONYMOUS	0x20		/* Don't use a file.  */
+# endif
+# define MAP_ANON	MAP_ANONYMOUS
+/* When MAP_HUGETLB is set bits [26:31] encode the log2 of the huge page size.  */
+# define MAP_HUGE_SHIFT	26
+# define MAP_HUGE_MASK	0x3f
+#endif
+
+/* Flags to `msync'.  */
+#define MS_ASYNC	1		/* Sync memory asynchronously.  */
+#define MS_SYNC		4		/* Synchronous memory sync.  */
+#define MS_INVALIDATE	2		/* Invalidate the caches.  */
+
+/* Flags for `mremap'.  */
+#ifdef __USE_GNU
+# define MREMAP_MAYMOVE	1
+# define MREMAP_FIXED	2
+#endif
+
+/* only define for MMU targets, no-MMU does not support madvise.  */
+#ifdef __ARCH_USE_MMU__
+/* Advice to `madvise'.  */
+# ifdef __USE_MISC
+#  define MADV_NORMAL	  0	/* No further special treatment.  */
+#  define MADV_RANDOM	  1	/* Expect random page references.  */
+#  define MADV_SEQUENTIAL 2	/* Expect sequential page references.  */
+#  define MADV_WILLNEED	  3	/* Will need these pages.  */
+#  define MADV_DONTNEED	  4	/* Don't need these pages.  */
+#  define MADV_FREE	  8	/* Free pages only if memory pressure.  */
+#  define MADV_REMOVE	  9	/* Remove these pages and resources.  */
+#  define MADV_DONTFORK	  10	/* Do not inherit across fork.  */
+#  define MADV_DOFORK	  11	/* Do inherit across fork.  */
+#  define MADV_MERGEABLE  12	/* KSM may merge identical pages.  */
+#  define MADV_UNMERGEABLE 13	/* KSM may not merge identical pages.  */
+#  define MADV_HUGEPAGE	  14	/* Worth backing with hugepages.  */
+#  define MADV_NOHUGEPAGE 15	/* Not worth backing with hugepages.  */
+#  define MADV_DONTDUMP	  16    /* Explicity exclude from the core dump,
+                                    overrides the coredump filter bits.  */
+#  define MADV_DODUMP	  17	/* Clear the MADV_DONTDUMP flag.  */
+#  define MADV_WIPEONFORK 18	/* Zero memory on fork, child only.  */
+#  define MADV_KEEPONFORK 19	/* Undo MADV_WIPEONFORK.  */
+#  define MADV_HWPOISON	 100	/* Poison a page for testing.  */
+# endif
+
+/* The POSIX people had to invent similar names for the same things.  */
+# ifdef __USE_XOPEN2K
+#  define POSIX_MADV_NORMAL	0 /* No further special treatment.  */
+#  define POSIX_MADV_RANDOM	1 /* Expect random page references.  */
+#  define POSIX_MADV_SEQUENTIAL	2 /* Expect sequential page references.  */
+#  define POSIX_MADV_WILLNEED	3 /* Will need these pages.  */
+#  define POSIX_MADV_DONTNEED	4 /* Don't need these pages.  */
+# endif
+#endif
+
+/* Flags for `mlockall'.  */
+#ifndef MCL_CURRENT
+# define MCL_CURRENT	1		/* Lock all currently mapped pages.  */
+# define MCL_FUTURE	2		/* Lock all additions to address
+					   space.  */
+# define MCL_ONFAULT	4		/* Lock all pages that are
+					   faulted in.  */
+#endif
+
+#include <bits/mman-shared.h>
diff --git a/libc/sysdeps/linux/common/bits/mman-shared.h b/libc/sysdeps/linux/common/bits/mman-shared.h
new file mode 100644
index 000000000..c40ae2d1e
--- /dev/null
+++ b/libc/sysdeps/linux/common/bits/mman-shared.h
@@ -0,0 +1,75 @@
+/* Memory-mapping-related declarations/definitions, not architecture-specific.
+   Copyright (C) 2017-2018 Free Software Foundation, Inc.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef _SYS_MMAN_H
+# error "Never use <bits/mman-shared.h> directly; include <sys/mman.h> instead."
+#endif
+
+#ifdef __USE_GNU
+/* Flags for memfd_create.  */
+# ifndef MFD_CLOEXEC
+#  define MFD_CLOEXEC 1U
+#  define MFD_ALLOW_SEALING 2U
+#  define MFD_HUGETLB 4U
+# endif
+
+/* Flags for mlock2.  */
+# ifndef MLOCK_ONFAULT
+#  define MLOCK_ONFAULT 1U
+# endif
+
+/* Access rights for pkey_alloc.  */
+# ifndef PKEY_DISABLE_ACCESS
+#  define PKEY_DISABLE_ACCESS 0x1
+#  define PKEY_DISABLE_WRITE 0x2
+# endif
+
+__BEGIN_DECLS
+
+/* Create a new memory file descriptor.  NAME is a name for debugging.
+   FLAGS is a combination of the MFD_* constants.  */
+int memfd_create (const char *__name, unsigned int __flags) __THROW;
+
+/* Lock pages from ADDR (inclusive) to ADDR + LENGTH (exclusive) into
+   memory.  FLAGS is a combination of the MLOCK_* flags above.  */
+int mlock2 (const void *__addr, size_t __length, unsigned int __flags) __THROW;
+
+/* Allocate a new protection key, with the PKEY_DISABLE_* bits
+   specified in ACCESS_RIGHTS.  The protection key mask for the
+   current thread is updated to match the access privilege for the new
+   key.  */
+int pkey_alloc (unsigned int __flags, unsigned int __access_rights) __THROW;
+
+/* Update the access rights for the current thread for KEY, which must
+   have been allocated using pkey_alloc.  */
+int pkey_set (int __key, unsigned int __access_rights) __THROW;
+
+/* Return the access rights for the current thread for KEY, which must
+   have been allocated using pkey_alloc.  */
+int pkey_get (int _key) __THROW;
+
+/* Free an allocated protection key, which must have been allocated
+   using pkey_alloc.  */
+int pkey_free (int __key) __THROW;
+
+/* Apply memory protection flags for KEY to the specified address
+   range.  */
+int pkey_mprotect (void *__addr, size_t __len, int __prot, int __pkey) __THROW;
+
+__END_DECLS
+
+#endif /* __USE_GNU */