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7d5c5706a0
The operand sepcifiers in a_cas and a_cas_p for riscv64 were incorrect: there's a backwards branch in the routine, so despite tmp being written at the end of the assembly fragment it cannot be allocated in one of the input registers because the input values may be needed for another trip around the loop. For code that follows the guaranteed forward progress requirements, the backwards branch is rarely taken: SiFive's hardware only fails a store conditional on execptional cases (ie, instruction cache misses inside the loop), and until recently a bug in QEMU allowed back-to-back store conditionals to succeed. The bug has been fixed in the latest QEMU release, but it turns out that the fix caused this latent bug in musl to manifest.
musl libc
musl, pronounced like the word "mussel", is an MIT-licensed
implementation of the standard C library targetting the Linux syscall
API, suitable for use in a wide range of deployment environments. musl
offers efficient static and dynamic linking support, lightweight code
and low runtime overhead, strong fail-safe guarantees under correct
usage, and correctness in the sense of standards conformance and
safety. musl is built on the principle that these goals are best
achieved through simple code that is easy to understand and maintain.
The 1.1 release series for musl features coverage for all interfaces
defined in ISO C99 and POSIX 2008 base, along with a number of
non-standardized interfaces for compatibility with Linux, BSD, and
glibc functionality.
For basic installation instructions, see the included INSTALL file.
Information on full musl-targeted compiler toolchains, system
bootstrapping, and Linux distributions built on musl can be found on
the project website:
http://www.musl-libc.org/