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6af4f25b89
Calling __tls_get_addr with brasl is not valid since it's a global symbol; doing so results in an R_390_PC32DBL relocation error from lld. We could fix this by marking __tls_get_addr hidden since it is not part of the s390x ABI, or by using a different instruction. However, given its simplicity, it makes more sense to just manually inline it into __tls_get_offset for performance. The patch has been tested by applying to Zig's bundled musl copy and running the full Zig test suite under qemu-s390x.
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/