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arm64: Add a BTI landing pad to .mcount
The .mcount function needs a BTI branch target. As we can't rely on asm.h being included use the hint version of a "bti c" instruction. This is a nop when BTI is not supported or not used. Reviewed by: markj Sponsored by: Arm Ltd Differential Revision: https://reviews.freebsd.org/D42230
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@ -68,6 +68,8 @@ static void _mcount
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" .globl .mcount \n" \
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" .mcount: \n" \
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" .cfi_startproc \n" \
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/* Allow this to work with BTI, see BTI_C in asm.h */ \
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" hint #34 \n" \
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/* Load the caller return address as frompc */ \
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" ldr x0, [x29, #8] \n" \
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/* Use our return address as selfpc */ \
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