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Cygwin: Guard XSAVE allocation against broken CPUID emulation #378

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Merged
dscho merged 1 commit into from
Oct 14, 2026
Merged

Cygwin: Guard XSAVE allocation against broken CPUID emulation #378

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1 change: 1 addition & 0 deletions winsup/cygwin/scripts/gendef
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Original file line number Diff line number Diff line change
Expand Up @@ -232,6 +232,7 @@ sigdelayed:
movl \$0x0d,%eax
xorl %ecx,%ecx
cpuid # get necessary space for xsave
movl %ebx,%ebx # clear upper 32 bits from a faulty CPUID implementation
movq %rbx,%rcx
addq \$63, %rbx
andq \$-64, %rbx # align to next 64-byte multiple
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