Hi, Willy, Thomas
Thanks very much for your careful review and great suggestions, now, we get v4 revision of the arch shrink series [1], it mainly include a new fixup for -O0 under gcc < 11.1.0, the stackprotector support for _start_c(), new testcases for startup code and two new test targets.
All of the tests passed or skipped (tinyconfig + few options + qemu-system) for both -Os and -O0:
arch/board | result ------------|------------ arm/versatilepb | 165 test(s): 158 passed, 7 skipped, 0 failed => status: warning. arm/vexpress-a9 | 165 test(s): 158 passed, 7 skipped, 0 failed => status: warning. arm/virt | 165 test(s): 158 passed, 7 skipped, 0 failed => status: warning. aarch64/virt | 165 test(s): 158 passed, 7 skipped, 0 failed => status: warning. i386/pc | 165 test(s): 158 passed, 7 skipped, 0 failed => status: warning. x86_64/pc | 165 test(s): 158 passed, 7 skipped, 0 failed => status: warning. mipsel/malta | 165 test(s): 158 passed, 7 skipped, 0 failed => status: warning. loongarch64/virt | 165 test(s): 158 passed, 7 skipped, 0 failed => status: warning. riscv64/virt | 165 test(s): 158 passed, 7 skipped, 0 failed => status: warning. s390x/s390-ccw-virtio | 165 test(s): 158 passed, 7 skipped, 0 failed => status: warning.
And more, for both -Os and -O0:
$ for r in run-user run-nolibc-test run-libc-test; do make clean > /dev/null; make $r | grep status; done 165 test(s): 157 passed, 8 skipped, 0 failed => status: warning 165 test(s): 157 passed, 8 skipped, 0 failed => status: warning 165 test(s): 153 passed, 12 skipped, 0 failed => status: warning
// for make run-user, the euid0 and 32bit limit related tests are // skipped $ make clean && make run-user $ grep -i skip run.out 17 chroot_root [SKIPPED] 39 link_dir [SKIPPED] 62 limit_intptr_min_32 [SKIPPED] 63 limit_intptr_max_32 [SKIPPED] 64 limit_uintptr_max_32 [SKIPPED] 65 limit_ptrdiff_min_32 [SKIPPED] 66 limit_ptrdiff_max_32 [SKIPPED] 67 limit_size_max_32 [SKIPPED]
// for run-libc-test, the _auxv variables, euid0, 32bits limit and // stackprotector related tests are skipped $ make clean && make run-libc-test $ grep -i skip run.out 9 environ_auxv [SKIPPED] 10 environ_total [SKIPPED] 12 auxv_addr [SKIPPED] 17 chroot_root [SKIPPED] 39 link_dir [SKIPPED] 62 limit_intptr_min_32 [SKIPPED] 63 limit_intptr_max_32 [SKIPPED] 64 limit_uintptr_max_32 [SKIPPED] 65 limit_ptrdiff_min_32 [SKIPPED] 66 limit_ptrdiff_max_32 [SKIPPED] 67 limit_size_max_32 [SKIPPED] 0 -fstackprotector not supported [SKIPPED]
$ make clean >/dev/null; make run-libc-test CC=/labs/linux-lab/src/examples/musl-install/bin/musl-gcc | grep status 165 test(s): 151 passed, 12 skipped, 2 failed => status: failure
// The failures are expected for musl has disabled both sbrk and brk // but not the sbrk(0); the _auxv variables, euid0, 32bits limit and // stackprotector related tests are skipped for musl too
$ grep FAIL -ur run.out 9 sbrk = 1 ENOMEM [FAIL] 10 brk = -1 ENOMEM [FAIL]
$ grep "SKIP" -ur run.out 9 environ_auxv [SKIPPED] 10 environ_total [SKIPPED] 12 auxv_addr [SKIPPED] 17 chroot_root [SKIPPED] 39 link_dir [SKIPPED] 62 limit_intptr_min_32 [SKIPPED] 63 limit_intptr_max_32 [SKIPPED] 64 limit_uintptr_max_32 [SKIPPED] 65 limit_ptrdiff_min_32 [SKIPPED] 66 limit_ptrdiff_max_32 [SKIPPED] 67 limit_size_max_32 [SKIPPED] 0 -fstackprotector not supported [SKIPPED]
For stackprotector, gcc 13.1.0 is used to test on x86_64 standalonely:
$ make run-user CROSS_COMPILE=x86_64-linux- | grep status 165 test(s): 157 passed, 8 skipped, 0 failed => status: warning $ grep stack -ur run.out 0 -fstackprotector [OK] $ make run-nolibc-test CROSS_COMPILE=x86_64-linux- | grep status 165 test(s): 157 passed, 8 skipped, 0 failed => status: warning $ grep stack -ur run.out 0 -fstackprotector [OK]
Changes from v3 --> v4:
* tools/nolibc: arch-*.h: add missing space after ',' tools/nolibc: fix up startup failures for -O0 under gcc < 11.1.0
Both of the above changes are for _start, it is able to merge them if necessary.
The first one is old for format errors reported by scripts/checkpatch.pl
The second one is for -O0 failure under gcc < 11.1.0, applied the optimize("-Os", "omit-frame-pointer") suggestion from Thomas.
* tools/nolibc: remove the old sys_stat support
As suggested by Willy, Document carefully about the statx supported Linux version info.
* tools/nolibc: add new crt.h with _start_c
The code is polished carefully for smaller size and better readability.
* tools/nolibc: stackprotector.h: add empty __stack_chk_init for !_NOLIBC_STACKPROTECTOR tools/nolibc: crt.h: initialize stack protector
As suggested by Thomas, init stackprotector in _start_c() too.
* tools/nolibc: arm: shrink _start with _start_c tools/nolibc: aarch64: shrink _start with _start_c tools/nolibc: i386: shrink _start with _start_c tools/nolibc: x86_64: shrink _start with _start_c tools/nolibc: mips: shrink _start with _start_c tools/nolibc: loongarch: shrink _start with _start_c tools/nolibc: riscv: shrink _start with _start_c tools/nolibc: s390: shrink _start with _start_c
Removed the stackprotector initialization from _start too, we already have it in _start_c().
* selftests/nolibc: add EXPECT_PTRGE, EXPECT_PTRGT, EXPECT_PTRLE, EXPECT_PTRLT selftests/nolibc: add testcases for startup code
Add a new startup test group to cover the testing of argc, argv/argv0, envp/environ and _auxv.
Some testcases are enhanced, some are newly added from after the discussion during v3 review.
* selftests/nolibc: allow run nolibc-test locally selftests/nolibc: allow test -include /path/to/nolibc.h
Two new test targets are added to cover more scenes.
Hope you like this revisoin ;-)
Next patchset is powerpc & powerpc64 support, after that we will send the v2 of tinyconfig support, at last the left rv32 patches (mainly 64bit time).
Best regards, Zhangjin --- [1]: https://lore.kernel.org/lkml/20230715100134.GD24086@1wt.eu/
Zhangjin Wu (18): tools/nolibc: arch-*.h: add missing space after ',' tools/nolibc: fix up startup failures for -O0 under gcc < 11.1.0 tools/nolibc: remove the old sys_stat support tools/nolibc: add new crt.h with _start_c tools/nolibc: stackprotector.h: add empty __stack_chk_init for !_NOLIBC_STACKPROTECTOR tools/nolibc: crt.h: initialize stack protector tools/nolibc: arm: shrink _start with _start_c tools/nolibc: aarch64: shrink _start with _start_c tools/nolibc: i386: shrink _start with _start_c tools/nolibc: x86_64: shrink _start with _start_c tools/nolibc: mips: shrink _start with _start_c tools/nolibc: loongarch: shrink _start with _start_c tools/nolibc: riscv: shrink _start with _start_c tools/nolibc: s390: shrink _start with _start_c selftests/nolibc: add EXPECT_PTRGE, EXPECT_PTRGT, EXPECT_PTRLE, EXPECT_PTRLT selftests/nolibc: add testcases for startup code selftests/nolibc: allow run nolibc-test locally selftests/nolibc: allow test -include /path/to/nolibc.h
tools/include/nolibc/Makefile | 1 + tools/include/nolibc/arch-aarch64.h | 57 +--------- tools/include/nolibc/arch-arm.h | 83 ++------------- tools/include/nolibc/arch-i386.h | 62 ++--------- tools/include/nolibc/arch-loongarch.h | 46 +------- tools/include/nolibc/arch-mips.h | 76 ++----------- tools/include/nolibc/arch-riscv.h | 69 ++---------- tools/include/nolibc/arch-s390.h | 63 ++--------- tools/include/nolibc/arch-x86_64.h | 58 ++-------- tools/include/nolibc/crt.h | 61 +++++++++++ tools/include/nolibc/stackprotector.h | 2 + tools/include/nolibc/sys.h | 63 ++--------- tools/include/nolibc/types.h | 4 +- tools/testing/selftests/nolibc/Makefile | 12 +++ tools/testing/selftests/nolibc/nolibc-test.c | 106 ++++++++++++++++++- 15 files changed, 246 insertions(+), 517 deletions(-) create mode 100644 tools/include/nolibc/crt.h