I am trying to understand the compiled code for our ARM embedded system, using armclang compiler. Specifically, our code has a 64-bit signed division, which is translated to a call to the aeabi_ldivmod builtin. I was able to find its source code here, and it seems like it calls another builtin: __divmoddi4. Trying to look for the source code of this one, I come up with nothing. The closest thing I found is divmodsi4.S, but this is for 32-bit values.
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Where can I find the source code to
__divmoddi4? Specifically, I am looking for the function’s interface definition (not the C prototype). I am interested in understanding what registers are passed in and out. -
Where can I find the interface for the caller,
aeabi_ldivmod?