[PATCH v3 0/5] Add LoongArch support to nolibc

[chris . chenfeiyang]

From: Feiyang Chen <chenfeiyang@xxxxxxxxxxx>

Add statx() and make stat() rely on statx() if necessary.
Add support for LoongArch (32 and 64 bit) to nolibc.
It was tested on LoongArch64 only.

The latest QEMU support full-system emulation of a LoongArch64
machine, but for the moment we need to specify the firmware manually.
https://github.com/loongson/Firmware/tree/main/LoongArchVirtMachine

QEMU_ARGS_loongarch  = -M virt -bios edk2-loongarch64-code.fd ...

v2:
- Mention that statx() will also benefit other architectures.
- Make stat() rely on statx() when available.
- Put the whitespace changes into one commit.

v3:
- Add #if defined(__NR_statx) guard.
- Keep the check for statx() from the first version.
- Mention that we may use statx() everywhere in the future.
- struct statx stat -> struct statx statx.

Feiyang Chen (5):
  tools/nolibc: Include linux/fcntl.h and remove duplicate code
  tools/nolibc: Add statx() and make stat() rely on statx() if necessary
  tools/nolibc: Add support for LoongArch
  selftests/nolibc: Add support for LoongArch
  selftests/nolibc: Adjust indentation for Makefile

 tools/include/nolibc/arch-loongarch.h   | 200 ++++++++++++++++++++++++
 tools/include/nolibc/arch.h             |   2 +
 tools/include/nolibc/sys.h              |  58 ++++++-
 tools/include/nolibc/types.h            |   5 -
 tools/testing/selftests/nolibc/Makefile |  78 ++++-----
 5 files changed, 300 insertions(+), 43 deletions(-)
 create mode 100644 tools/include/nolibc/arch-loongarch.h

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2.39.0