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Linux: Define MMAP_CALL_INTERNAL

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Unlike MMAP_CALL, this avoids a TCB dependency for an errno update
on failure.

<mmap_internal.h> cannot be included as is on several architectures
due to the definition of page_unit, so introduce a separate header
file for the definition of MMAP_CALL and MMAP_CALL_INTERNAL,
<mmap_call.h>.

Reviewed-by: Stefan Liebler <stli@linux.ibm.com>
(cherry picked from commit c1b68685d4)
This commit is contained in:
Florian Weimer 2022-05-04 15:37:21 +02:00
parent 1a5b9d1a23
commit b38c9cdb58
3 changed files with 30 additions and 12 deletions
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22
sysdeps/unix/sysv/linux/mmap_call.h Normal file
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@ -0,0 +1,22 @@
/* Generic definition of MMAP_CALL and MMAP_CALL_INTERNAL.
Copyright (C) 2017-2022 Free Software Foundation, Inc.
This file is part of the GNU C Library.
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
<https://www.gnu.org/licenses/>. */
#define MMAP_CALL(__nr, __addr, __len, __prot, __flags, __fd, __offset) \
INLINE_SYSCALL_CALL (__nr, __addr, __len, __prot, __flags, __fd, __offset)
#define MMAP_CALL_INTERNAL(__nr, __addr, __len, __prot, __flags, __fd, __offset) \
INTERNAL_SYSCALL_CALL (__nr, __addr, __len, __prot, __flags, __fd, __offset)

6
sysdeps/unix/sysv/linux/mmap_internal.h
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@ -40,10 +40,6 @@ static uint64_t page_unit;
/* Do not accept offset not multiple of page size. */ /* Do not accept offset not multiple of page size. */
#define MMAP_OFF_LOW_MASK (MMAP2_PAGE_UNIT - 1) #define MMAP_OFF_LOW_MASK (MMAP2_PAGE_UNIT - 1)
/* An architecture may override this. */ #include <mmap_call.h>
#ifndef MMAP_CALL
# define MMAP_CALL(__nr, __addr, __len, __prot, __flags, __fd, __offset) \
INLINE_SYSCALL_CALL (__nr, __addr, __len, __prot, __flags, __fd, __offset)
#endif
#endif /* MMAP_INTERNAL_LINUX_H */ #endif /* MMAP_INTERNAL_LINUX_H */

14
sysdeps/unix/sysv/linux/s390/mmap_internal.h → sysdeps/unix/sysv/linux/s390/mmap_call.h
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@ -16,9 +16,6 @@
License along with the GNU C Library; if not, see License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */ <https://www.gnu.org/licenses/>. */
#ifndef MMAP_S390_INTERNAL_H
# define MMAP_S390_INTERNAL_H
#define MMAP_CALL(__nr, __addr, __len, __prot, __flags, __fd, __offset) \ #define MMAP_CALL(__nr, __addr, __len, __prot, __flags, __fd, __offset) \
({ \ ({ \
long int __args[6] = { (long int) (__addr), (long int) (__len), \ long int __args[6] = { (long int) (__addr), (long int) (__len), \
@ -26,7 +23,10 @@
(long int) (__fd), (long int) (__offset) }; \ (long int) (__fd), (long int) (__offset) }; \
INLINE_SYSCALL_CALL (__nr, __args); \ INLINE_SYSCALL_CALL (__nr, __args); \
}) })
#define MMAP_CALL_INTERNAL(__nr, __addr, __len, __prot, __flags, __fd, __offset) \
#include_next <mmap_internal.h> ({ \
long int __args[6] = { (long int) (__addr), (long int) (__len), \
#endif (long int) (__prot), (long int) (__flags), \
(long int) (__fd), (long int) (__offset) }; \
INTERNAL_SYSCALL_CALL (__nr, __args); \
})