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Make MXCSR editable by signal handlers on Windows

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It's now possible to recover from floating point exception traps.
This commit is contained in:
Justine Tunney 2024-04-30 13:17:22 -07:00
parent 3bcd40be12
commit 403bc25412
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GPG key ID: BE714B4575D6E328
1 changed files with 2 additions and 0 deletions
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2
libc/intrin/ntcontext2linux.c
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@ -48,6 +48,7 @@ textwindows void _ntcontext2linux(ucontext_t *ctx, const struct NtContext *cr) {
ctx->uc_mcontext.fs = cr->SegFs;
ctx->uc_mcontext.fpregs = &ctx->__fpustate;
__repmovsb(&ctx->__fpustate, &cr->FltSave, sizeof(ctx->__fpustate));
ctx->__fpustate.mxcsr = cr->MxCsr;
}
textwindows void _ntlinux2context(struct NtContext *cr, const ucontext_t *ctx) {
@ -74,6 +75,7 @@ textwindows void _ntlinux2context(struct NtContext *cr, const ucontext_t *ctx) {
cr->SegCs = ctx->uc_mcontext.cs;
cr->SegGs = ctx->uc_mcontext.gs;
cr->SegFs = ctx->uc_mcontext.fs;
cr->MxCsr = ctx->__fpustate.mxcsr;
__repmovsb(&cr->FltSave, &ctx->__fpustate, sizeof(ctx->__fpustate));
}