commit	61ea1995c8f0703b625bf3422366b20fb98852d1	[log] [tgz]
author	Stephen Crane <sjc@immunant.com>	Tue Nov 17 10:23:56 2020 -0800
committer	Stephen Crane <sjc@immunant.com>	Mon Dec 14 15:06:19 2020 -0800
tree	35b6ec264579a42c601a3d4794be4be7db4a6604
parent	20043c305df7a8d86af029d37ab971a6ea18d14f [diff]

[make] Force correct frame pointers for sancov

Accurate LLVM coverage instrumentation with trace-pc-guard requires
being able to correctly find a function's caller. With sibling call
optimization, calls at the end of a function are turned into a direct
branch to the sibling function, which causes the builtin returning our
caller in the instrumentation to return the wrong caller.

Disable sibling call optimization when building with coverage
instrumentation.

Bug: 175221942
Test: USER_COVERAGE_ENABLED=true build.py qemu-generic-arm64-fuzz-test-debug
Change-Id: I596ee3565a95d288f2633042ded9573ce0583915

make/module.mk[diff]

1 file changed

tree: 35b6ec264579a42c601a3d4794be4be7db4a6604

README.md

LK

The LK embedded kernel. An SMP-aware kernel designed for small systems.

See https://github.com/littlekernel/lk for the latest version.

See https://github.com/littlekernel/lk/wiki for documentation.

Builds

To build and test for ARM on linux

install or build qemu. v2.4 and above is recommended.
install gcc for embedded arm (see note 1)
run scripts/do-qemuarm (from the lk directory)
you should see ‘welcome to lk/MP’

This will get you a interactive prompt into LK which is running in qemu arm machine ‘virt’ emulation. type ‘help’ for commands.

note 1: for ubuntu: sudo apt-get install gcc-arm-none-eabi or fetch a prebuilt toolchain from http://newos.org/toolchains/arm-eabi-5.3.0-Linux-x86_64.tar.xz