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x86asm: Generate endbr32 based on __CET__.

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The VIA Nehemiah CPU is a x86-32 CPU without SSE2 support. It does not
support multi byte nops and considers the endb32 opcode as an invalid
instruction.

Add an ifdef around the endbr32 opcode on x86-32.

Fixes: #18334
Signed-off-by: Sebastian Andrzej Siewior <sebastian@breakpoint.cc>

Reviewed-by: Tomas Mraz <tomas@openssl.org>
Reviewed-by: Paul Dale <pauli@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/18353)
This commit is contained in:
Sebastian Andrzej Siewior 2022-05-19 21:51:18 +02:00 committed by Pauli
parent 9968c77539
commit 272138795f
1 changed files with 2 additions and 0 deletions
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crypto/perlasm/x86asm.pl
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@ -174,7 +174,9 @@ sub ::vprotd
sub ::endbranch
{
&::generic("#ifdef __CET__\n");
&::data_byte(0xf3,0x0f,0x1e,0xfb);
&::generic("#endif\n");
}
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