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* [glibc/release/2.34/master] Linux: Define MMAP_CALL_INTERNAL
@ 2022-05-19 13:05 Florian Weimer
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From: Florian Weimer @ 2022-05-19 13:05 UTC (permalink / raw)
To: glibc-cvs
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=b38c9cdb58061d357cdf9bca4f6967d487becb82
commit b38c9cdb58061d357cdf9bca4f6967d487becb82
Author: Florian Weimer <fweimer@redhat.com>
Date: Wed May 4 15:37:21 2022 +0200
Linux: Define MMAP_CALL_INTERNAL
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 c1b68685d438373efe64e5f076f4215723004dfb)
Diff:
---
sysdeps/unix/sysv/linux/mmap_call.h | 22 ++++++++++++++++++++++
sysdeps/unix/sysv/linux/mmap_internal.h | 6 +-----
.../linux/s390/{mmap_internal.h => mmap_call.h} | 14 +++++++-------
3 files changed, 30 insertions(+), 12 deletions(-)
diff --git a/sysdeps/unix/sysv/linux/mmap_call.h b/sysdeps/unix/sysv/linux/mmap_call.h
new file mode 100644
index 0000000000..3547c99e14
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/mmap_call.h
@@ -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)
diff --git a/sysdeps/unix/sysv/linux/mmap_internal.h b/sysdeps/unix/sysv/linux/mmap_internal.h
index 5ca6976191..989eb0c7c6 100644
--- a/sysdeps/unix/sysv/linux/mmap_internal.h
+++ b/sysdeps/unix/sysv/linux/mmap_internal.h
@@ -40,10 +40,6 @@ static uint64_t page_unit;
/* Do not accept offset not multiple of page size. */
#define MMAP_OFF_LOW_MASK (MMAP2_PAGE_UNIT - 1)
-/* An architecture may override this. */
-#ifndef MMAP_CALL
-# define MMAP_CALL(__nr, __addr, __len, __prot, __flags, __fd, __offset) \
- INLINE_SYSCALL_CALL (__nr, __addr, __len, __prot, __flags, __fd, __offset)
-#endif
+#include <mmap_call.h>
#endif /* MMAP_INTERNAL_LINUX_H */
diff --git a/sysdeps/unix/sysv/linux/s390/mmap_internal.h b/sysdeps/unix/sysv/linux/s390/mmap_call.h
similarity index 78%
rename from sysdeps/unix/sysv/linux/s390/mmap_internal.h
rename to sysdeps/unix/sysv/linux/s390/mmap_call.h
index 46f1c3769d..bdd30cc837 100644
--- a/sysdeps/unix/sysv/linux/s390/mmap_internal.h
+++ b/sysdeps/unix/sysv/linux/s390/mmap_call.h
@@ -16,9 +16,6 @@
License along with the GNU C Library; if not, see
<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) \
({ \
long int __args[6] = { (long int) (__addr), (long int) (__len), \
@@ -26,7 +23,10 @@
(long int) (__fd), (long int) (__offset) }; \
INLINE_SYSCALL_CALL (__nr, __args); \
})
-
-#include_next <mmap_internal.h>
-
-#endif
+#define MMAP_CALL_INTERNAL(__nr, __addr, __len, __prot, __flags, __fd, __offset) \
+ ({ \
+ long int __args[6] = { (long int) (__addr), (long int) (__len), \
+ (long int) (__prot), (long int) (__flags), \
+ (long int) (__fd), (long int) (__offset) }; \
+ INTERNAL_SYSCALL_CALL (__nr, __args); \
+ })
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