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syscall.h
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arch/arm/include/armv7-m/syscall.h: ARM EABI specifies that the stack should be aligned by 8 on function calls, inside the function is not required to be aligned by 8. Since these functions call svc, compiler doesn't know that the svc is a function, therefore it does not do any stack management. This change pushes an even number of args to the stack and maintains an 8 byte alignment. I've checked the assembly and it doesn't cause any more overhead that the hand written assembly.
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2019-12-16 09:10:08 -06:00 |