[PATCH 0/2] RISC-V: implement private GCC library

[Heinrich Schuchardt]

We currently include libgcc.a when building for the RISC-V architecture.
For instance lib/mbedtls/external/mbedtls/library/bignum.c uses __ctzdi2().

At least the Ubuntu Linux distribution has switched to building libgcc.a
for the RVA23S64 profile. Using this library on RVA20 systems results in
crashes. We therefore need a private replacement library.

With the series a private GCC library and unit tests are provided for
64-bit RISC-V. This is enough to build for CONFIG_WGET_HTTPS as suggested
in E's patch

[PATCH] configs: starfive: enable wget https
https://lore.kernel.org/u-boot/20251112005451.41285-1-e@freeshell.de/

Heinrich Schuchardt (2):
  RISC-V: implement private GCC library
  test: provide unit tests for the RISC-V private GCC library

 arch/Kconfig            |   1 +
 arch/riscv/lib/Makefile |   2 +
 arch/riscv/lib/clz.c    | 105 ++++++++++++++++++++++++++++++++++++++++
 arch/riscv/lib/ctz.c    |  97 +++++++++++++++++++++++++++++++++++++
 lib/Kconfig             |   2 +-
 test/lib/Makefile       |   4 ++
 test/lib/test_clz.c     |  53 ++++++++++++++++++++
 test/lib/test_ctz.c     |  53 ++++++++++++++++++++
 8 files changed, 316 insertions(+), 1 deletion(-)
 create mode 100644 arch/riscv/lib/clz.c
 create mode 100644 arch/riscv/lib/ctz.c
 create mode 100644 test/lib/test_clz.c
 create mode 100644 test/lib/test_ctz.c

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2.51.0