Momchil Velikov bc2e572f51 Re-commit: [ARM] CMSE code generation ...

This patch implements the final bits of CMSE code generation:

* emit special linker symbols

* restrict parameter passing to no use memory

* emit BXNS and BLXNS instructions for returns from non-secure entry
  functions, and non-secure function calls, respectively

* emit code to save/restore secure floating-point state around calls
  to non-secure functions

* emit code to save/restore non-secure floating-pointy state upon
  entry to non-secure entry function, and return to non-secure state

* emit code to clobber registers not used for arguments and returns

* when switching to no-secure state

Patch by Momchil Velikov, Bradley Smith, Javed Absar, David Green,
possibly others.

Differential Revision: https://reviews.llvm.org/D76518

2020-05-14 16:46:16 +01:00

821 B

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