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arm: udf instruction

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Ciro Santilli 六四事件 法轮功
2019-05-21 00:00:00 +00:00
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@@ -12678,6 +12678,15 @@ gdb-multiarch -batch -ex 'arch arm' -ex "file v7/nop.out" -ex "disassemble/rs as
Bibliography: https://stackoverflow.com/questions/1875491/nop-for-iphone-binaries
==== ARM udf instruction
Guaranteed undefined! Therefore raise illegal instruction signal. Used by GCC `__builtin_trap` apparently: https://stackoverflow.com/questions/16081618/programmatically-cause-undefined-instruction-exception
* link:userland/arch/arm/udf.S[]
* link:userland/arch/aarch64/udf.S[]
TODO: why GNU GAS 2.29 does not have a mnemonic for it?
=== ARM SIMD
==== ARM VFP