https://bugs.llvm.org/show_bug.cgi?id=49611
Bug ID: 49611
Summary: Need multiple errata workaround options for loongson
Product: libraries
Version: trunk
Hardware: Other
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: Backend: MIPS
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Our distro at aosc.io builds packages for the MIPS64 loongson devices some of
our users (and devs) have, but we cannot use Clang because many of the loongson
errata are only fixed in GCC. We request LLVM to implement options to fix the
following issues:
## Loongson 2F
Loongson 2F has issues with its NOP and jump instructions. The hanging NOP one
can affect userspace, while the deadlocking jump one can only affect kernel
code. A description is found in [1].
[1]: https://sourceware.org/legacy-ml/binutils/2009-11/msg00387.html
Loongson 2F is an older model, but we do wish that our netbooks can use some
proper Rust code.
## Loongson 3 (LLSC)
Loongson 3 is the current generation of Loongson CPUs. It can run into a
deadlock with ll/sc. The workaround involves putting a sync before ll and some
other stuff with sc.[2]
[2]:
https://binutils.sourceware.narkive.com/dP1eQBrO/patch-mips-add-fix-for-loongson3-llsc-errata
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