在2025年1月5日一月 上午4:43，Arnd Bergmann写道： [...] > If both the ISA and the ABI get it right, it should be possible to > build 32-bit userspace that is compatible with both when targeting > a 32-bit hardware, but still use 64-bit registers inside a single > function when the compiler is building for a 64-bit capable CPU > (e.g. "-march=la464 -m32"). There is a small cost in the calling > conventions for passing u64 arguments in pairs of registers > (unlike n32/x32/aarch64ilp32/rv64ilp32), but a huge benefit in > not maintaining two incompatible ABIs. Thanks Arnd for elaborating this! I actually more or less have this in mind when I was designing this ABI, thus GRs were designed to be 64bit in sigcontext. But I never look into that closely. I'll try to explore that option, maybe come up with a COMPAT implementation first. Thanks > > Arnd -- - Jiaxun
