On Mon, Nov 19, 2018 at 10:38:20AM +0530, Firoz Khan wrote:
On Wed, 14 Nov 2018 at 10:02, Firoz Khan firoz.khan@linaro.org wrote:
The purpose of this patch series is, we can easily add/modify/delete system call table support by cha- nging entry in syscall.tbl file instead of manually changing many files. The other goal is to unify the system call table generation support implementation across all the architectures.
The system call tables are in different format in all architecture. It will be difficult to manually add, modify or delete the system calls in the resp- ective files manually. To make it easy by keeping a script and which'll generate uapi header file and syscall table file.
syscall.tbl contains the list of available system calls along with system call number and correspond- ing entry point. Add a new system call in this arch- itecture will be possible by adding new entry in the syscall.tbl file.
Adding a new table entry consisting of: - System call number. - ABI. - System call name. - Entry point name.
Please note, this support is only available for 32-bit kernel, not 64-bit kernel. As I came across the 64-bit kernel is not active for long time.
ARM, s390 and x86 architecuture does exist the sim- ilar support. I leverage their implementation to come up with a generic solution.
I have done the same support for work for alpha, ia64, m68k, microblaze, mips, parisc, powerpc, sparc, and xtensa. Below mentioned git repository contains more details about the workflow.
https://github.com/frzkhn/system_call_table_generator/
Finally, this is the ground work to solve the Y2038 issue. We need to add two dozen of system calls to solve Y2038 issue. So this patch series will help to add new system calls easily by adding new entry in the syscall- .tbl.
Changes since v2:
- changed from generic-y to generated-y in Kbuild.
Changes since v1:
- optimized/updated the syscall table generation scripts.
- fixed all mixed indentation issues in syscall.tbl.
- added "comments" in syscall.tbl.
Firoz Khan (3): sh: add __NR_syscalls along with NR_syscalls sh: add system call table generation support sh: generate uapi header and syscall table header files
Gentle reminder!
Could someone review this patch series. I haven't received any feedback till now.
I'm way behind, but fine with it going upstream via whatever tree is appropriate. I think Arnd will take care of it.
Acked-by: Rich Felker dalias@libc.org
FYI, this support is only available for 32-bit kernel, not 64-bit kernel. As I came across the 64-bit kernel is not active for long time.
Support for 64-bit, which AFAIK barely ever existed in hardware, was removed from GCC a long time ago. At some point it needs to be removed from the kernel too, and doing so should allow a lot of cleanup.
Rich