Plan 9 from Bell Labs’s /n/sources/patch/applied/5db-teq/readme

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Distributed under the Lucent Public License version 1.02.
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TEQ with S bit = 0 would be pointless, so ARM uses this case to encode "miscellaneous"
instructions like BKPT, BX and BLX.  Decoding these correctly allows db/acid to
single step through BX and BLX on armv5t+, and to show a breakpoint instruction
as 'BKPT $#0' instead of 'TEQ R0@>R0,R0'.

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