ARM Compiler toolchain Developing Software for ARM Processors: Interworking ARM and Thumb

Interworking ARM and Thumb

The following topics describe how to change between ARM state and Thumb state when writing code for processors that implement the ARM and Thumb instruction sets:

About interworking
When to use interworking
Assembly language interworking
C and C++ interworking
Pointers to functions in Thumb state
Using two versions of the same function
Assembly language interworking example
Interworking using veneers
C and C++ language interworking
C, C++, and assembly language interworking using veneers.

Note

These topics do not apply to ARMv6-M and ARMv7-M.

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