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| author | Florian Weimer <fweimer@redhat.com> | 2020-01-02 10:18:10 +0100 |
|---|---|---|
| committer | Florian Weimer <fweimer@redhat.com> | 2020-01-02 10:18:10 +0100 |
| commit | 4cf0d223052dabb9caed29e1e91e1d61933e14fb (patch) | |
| tree | 67679008431b6bc21bb6f7a5efd5f2071f9a76f1 /sysdeps/unix/sysv/linux/fixup-asm-unistd.h | |
| parent | 5f72f9800b250410cad3abfeeb09469ef12b2438 (diff) | |
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Linux: Add tables with system call numbers
The new tables are currently only used for consistency checks
with the installed kernel headers and the architecture-independent
system call names table. They are based on Linux 5.4.
The goal is to use these architecture-specific tables to ensure
that system call wrappers are available irrespective of the version
of the installed kernel headers.
The tables are formatted in the form of C header files so that they
can be used directly in an #include directive, without external
preprocessing. (External preprocessing of a plain table file
would introduce cross-subdirectory dependency issues.) However,
the intent is that they can still be treated as tables and can be
processed by simple tools.
The irregular system call names on 32-bit arm add a complication.
The <fixup-asm-unistd.h> header is introduced to work around that,
and the system calls are listed under regular names in the
<arch-syscall.h> file.
A make target, update-syscalls-list, is added to patch the glibc
sources with data from the current kernel headers.
Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
Diffstat (limited to 'sysdeps/unix/sysv/linux/fixup-asm-unistd.h')
| -rw-r--r-- | sysdeps/unix/sysv/linux/fixup-asm-unistd.h | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/fixup-asm-unistd.h b/sysdeps/unix/sysv/linux/fixup-asm-unistd.h new file mode 100644 index 0000000000..b7b4183377 --- /dev/null +++ b/sysdeps/unix/sysv/linux/fixup-asm-unistd.h @@ -0,0 +1,28 @@ +/* Regularize <asm/unistd.h> definitions. Default version. + Copyright (C) 2020 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/>. */ + +/* Some architectures have irregular system call names in + <asm/unistd.h>. glibc assumes that system call numbers start with + __NR_* and lists the system calls under proper names in + <arch-syscall.h>. + + During consistency tests, <fixup-asm-unistd.h> is included after + the kernel's <asm/unistd.h>, to introduce aliases as necessary to + match the glibc definitions in <arch-syscall.h>. + + Most architectures do not need these fixups, so the default header + is empty. */ |