b[l]x instruction in cortex-m3 code
Daniel Jacobowitz
drow@false.org
Wed Jul 20 06:19:00 GMT 2011
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Wed Jul 20 06:19:00 GMT 2011
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(Without HTML this time) On Mon, Jul 18, 2011 at 5:49 PM, Daniel Otte <daniel.otte@rub.de> wrote: > That was also my first thought, but it happens also with calls in the same file. No, this is something else. > 1d2: f240 13b1 movw r3, #433 ; 0x1b1 > 1d6: f2c0 0300 movt r3, #0 Notice the low bit set here. > 1e2: 4798 blx r3 Both bx reg and blx reg use mode based on the reg's low bit; they are perfectly fine on Cortex-M. But if you give them an invalid argument, they'll fault. -- Thanks, Daniel
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