This short series fixes a regression in semihosting's automatic string length
detection for 32‑bit targets, introduced when target_ulong was replaced with
uint64_t. The first patch restores the original behaviour where passing
-1 (0xffffffff) in arg2 triggers the auto‑length logic by detecting the
32‑bit sentinel and promoting it to the 64‑bit equivalent.

The second patch extends the TCG test suite with a new RISC‑V 32‑bit
semihosting test that exercises SYS_OPEN with auto‑length, verifying that
the fix works correctly on qemu-system-riscv32.

Signed-off-by: Nikita Shubin <nikita.shubin@maquefel.me>
---
Nikita Shubin (2):
      semihosting/arm-compat-semi: Fix auto‑strlen detection for 32‑bit targets
      tests/tcg/riscv32: Add RISC-V 32-bit semihosting test

 configure                                 |  6 +++-
 semihosting/arm-compat-semi.c             | 11 ++++++
 tests/tcg/riscv32/Makefile.softmmu-target | 30 +++++++++++++++++
 tests/tcg/riscv32/semihost.ld             | 24 +++++++++++++
 tests/tcg/riscv32/test-semihosting-open.S | 56 +++++++++++++++++++++++++++++++
 5 files changed, 126 insertions(+), 1 deletion(-)
---
base-commit: 3b50303f9563a42538a1fd5c0ea7f952e23016e1
change-id: 20260619-fix-sign-extended-32-bit-addresses-68eba061cd9a

Best regards,
-- 
Nikita Shubin