[v1] Add RISC-V semihosting 0.2. Finish ARM semihosting 2.0

[PATCH 0/9] Add RISC-V semihosting 0.2. Finish ARM semihosting 2.0

Keith Packard via posted 9 patches 4 years, 11 months ago

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Maintainers: Sagar Karandikar <sagark@eecs.berkeley.edu>, Laurent Vivier <laurent@vivier.eu>, Peter Maydell <peter.maydell@linaro.org>, Bastian Koppelmann <kbastian@mail.uni-paderborn.de>, Alistair Francis <Alistair.Francis@wdc.com>, Palmer Dabbelt <palmer@dabbelt.com>, "Alex Bennée" <alex.bennee@linaro.org>

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[PATCH 0/9] Add RISC-V semihosting 0.2. Finish ARM semihosting 2.0

Posted by Keith Packard via 4 years, 11 months ago

This series adds support for RISC-V Semihosting, version 0.2 as
specified here:

	https://github.com/riscv/riscv-semihosting-spec/releases/tag/0.2

This specification references the ARM semihosting release 2.0 as specified here:

	https://static.docs.arm.com/100863/0200/semihosting.pdf

That specification includes several semihosting calls which were not
previously implemented. This series includes implementations for the
remaining calls so that both RISC-V and ARM versions are now complete.

Tests for release 2.0 can be found in picolibc on the semihost-2.0-all
branch:

	https://github.com/picolibc/picolibc/tree/semihost-2.0-all

These tests uncovered a bug in the SYS_HEAPINFO implementation for
ARM, which has been fixed in this series as well.

The series is structured as follows:

 1. Move shared semihosting files
 2. Change public common semihosting APIs
 3. Change internal semihosting interfaces
 4. Fix SYS_HEAPINFO crash on ARM
 5-6. Add RISC-V semihosting implementation
 7-9. Add missing semihosting operations from release 2.0

Signed-off-by: Keith Packard <keithp@keithp.com>