CVS commit: src

["Kamil Rytarowski" <kamil%netbsd.org@localhost>]

Module Name:    src
Committed By:   kamil
Date:           Sun Mar 10 17:51:00 UTC 2019

Modified Files:
        src/share/man/man4: kcov.4
        src/sys/kern: subr_kcov.c
        src/sys/sys: kcov.h
        src/tests/modules: t_kcov.c

Log Message:
Add support for trace type selection in kcov(4)

Allow to specify mode in KCOV_IOC_ENABLE synchronizing the functionality
with Linux, FreeBSD and OpenBSD. As a NetBSD (and OpenBSD) specific of
the ioctl(2) interface, the mode argument has to be specified as &value
rather than value.

There are 3 modes available:
 1. KCOV_MODE_NONE       -- no trace specified, useful for testing purposes
 2. KCOV_MODE_TRACE_PC   -- trace the kernel program counter
 3. KCOV_MODE_TRACE_CMP  -- trace comparison instructions and switch statements

Adapt the ATF tests and documentation for new API.

The KCOV_MODE_TRACE_CMP mode is implemented but still awaits for the
GCC 8.x upgrade or selection of Clang/LLVM as the kernel compiler.

Obtained from OpenBSD and adapted for NetBSD by myself.


To generate a diff of this commit:
cvs rdiff -u -r1.3 -r1.4 src/share/man/man4/kcov.4
cvs rdiff -u -r1.4 -r1.5 src/sys/kern/subr_kcov.c
cvs rdiff -u -r1.3 -r1.4 src/sys/sys/kcov.h
cvs rdiff -u -r1.6 -r1.7 src/tests/modules/t_kcov.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.