Hi, Thomas, David, Willy
Thanks very much for your kindly review.
This is the revision of v3 "tools/nolibc: add a new syscall helper" [1], this mainly applies the suggestion from David in this reply [2] and rebased everything on the dev.2023.06.14a branch of linux-rcu [3].
The old __sysret() doesn't support the syscalls with pointer return value, this revision now supports such syscalls. The left mmap() syscall is converted to use this new __sysret() with additional test cases.
Changes from v3 -> v4:
* tools/nolibc: sys.h: add a syscall return helper tools/nolibc: unistd.h: apply __sysret() helper tools/nolibc: sys.h: apply __sysret() helper
The original v3 series, no code change, except the Reviewed-by lines from Thomas.
* tools/nolibc: unistd.h: reorder the syscall macros
reorder the syscall macros in using order and align most of them.
* tools/nolibc: add missing my_syscall6() for mips
required by mmap() syscall, this is the last missing my_syscall6().
* tools/nolibc: __sysret: support syscalls who return a pointer
Apply suggestion from David.
Let __sysret() also supports syscalls with pointer return value, so, the return value is converted to unsigned long and the comparing of < 0 is converted to the comparing of [(unsigned long)-MAX_ERRNO, (unsigned long)-1].
This also allows return a huge value (not pointer) with highest bit as 1.
It is able to merge this one to the first one if necessary.
* tools/nolibc: clean up mmap() support
Apply new __sysret(), clean up #ifdef and some macros.
* selftests/nolibc: add EXPECT_PTREQ, EXPECT_PTRNE and EXPECT_PTRER selftests/nolibc: add sbrk_0 to test current brk getting selftests/nolibc: add mmap and munmap test cases
Add some mmap & munmap test cases and the corresponding helpers, to verify one of the new helpers, a sbrk_0 test case is also added.
Best regards, Zhangjin --- [1]: https://lore.kernel.org/linux-riscv/87e7a391-b97b-4001-b12a-76d20790563e@t-8... [2]: https://lore.kernel.org/linux-riscv/94dd5170929f454fbc0a10a2eb3b108d@AcuMS.a... [3]: https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git/
Zhangjin Wu (10): tools/nolibc: sys.h: add a syscall return helper tools/nolibc: unistd.h: apply __sysret() helper tools/nolibc: sys.h: apply __sysret() helper tools/nolibc: unistd.h: reorder the syscall macros tools/nolibc: add missing my_syscall6() for mips tools/nolibc: __sysret: support syscalls who return a pointer tools/nolibc: clean up mmap() support selftests/nolibc: add EXPECT_PTREQ, EXPECT_PTRNE and EXPECT_PTRER selftests/nolibc: add sbrk_0 to test current brk getting selftests/nolibc: add mmap and munmap test cases
tools/include/nolibc/arch-mips.h | 26 ++ tools/include/nolibc/nolibc.h | 9 +- tools/include/nolibc/sys.h | 391 +++---------------- tools/include/nolibc/types.h | 11 + tools/include/nolibc/unistd.h | 13 +- tools/testing/selftests/nolibc/nolibc-test.c | 90 +++++ 6 files changed, 191 insertions(+), 349 deletions(-)