Purpose of RISCV_GCC_RED_ZONE_SIZE?

[Sebastian Huber]

Hello,

the RISC-V port has a RISCV_GCC_RED_ZONE_SIZE define. What is the purpose?

The current ABI says that there is no stack red zone:

https://github.com/riscv/riscv-elf-psabi-doc/blob/master/riscv-elf.md

"Procedures must not rely upon the persistence of stack-allocated data 
whose addresses lie below the stack pointer."

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Sebastian Huber, embedded brains GmbH

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