Messages in this thread | | | Date | Wed, 25 Nov 2015 23:47:11 +0000 | From | Russell King - ARM Linux <> | Subject | Re: [PATCH v2 1/2] scripts: Add a recorduidiv program |
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On Wed, Nov 25, 2015 at 01:51:03PM -0800, Stephen Boyd wrote: > The ARM compiler inserts calls to __aeabi_uidiv() and > __aeabi_idiv() when it needs to perform division on signed and > unsigned integers. If a processor has support for the udiv and > sdiv division instructions the calls to these support routines > can be replaced with those instructions. Therefore, record the > location of calls to these library functions into two sections > (one for udiv and one for sdiv) similar to how we trace calls to > mcount. When the kernel boots up it will check to see if the > processor supports the instructions and then patch the call sites > with the instruction.
Do we have any resolution on these programs which modify the object files in-place, rather than breaking any hard-links which may be present (eg, as a result of using ccache in hard-link mode) ?
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