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>Number: 60539
>Category: lib
>Synopsis: XSAVE changes break ucontext userspace API
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: lib-bug-people
>State: open
>Class: sw-bug
>Submitter-Id: net
>Arrival-Date: Tue Aug 04 20:00:00 +0000 2026
>Originator: nia
>Release: NetBSD 11.99.7
>Organization:
The NetBSD __foundation_t
>Environment:
NetBSD siphon 11.99.7 NetBSD 11.99.7 (SIPHON) #0: Sun Aug 2 22:56:47 CEST 2026 nia@siphon:/encrypt/obj/sys/arch/amd64/compile/SIPHON amd64
>Description:
The compiler error:
WasmSignalHandlers.cpp:177:24: error: invalid cast from type
'__fpregset_t' to type 'fxsave*'
The source code in question:
# define XMM_sig(p,i) (((struct fxsave64*)(p)->uc_mcontext.__fpregs)->fx_xmm[i])
This is from an old version of the Mozilla codebase:
https://repo.palemoon.org/MoonchildProductions/UXP/src/commit/4d5b1cc5d8597958e9bbed46b60752395d9d0532/js/src/wasm/WasmSignalHandlers.cpp#L177
>How-To-Repeat:
>Fix: