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There is no need to init arch every loop iteration.
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Fix checking of Logf, it has string in 0-th arg.
Add checking of t.Errorf/Fatalf.
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dwarf.go already detects if kcov is broken and need to provide this bit
for the check in report.go, so just use this bit in the test as well.
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On ARM64 we used to incorrectly parse BL instructions, which may start
with bytes 0x94 to 0x97. Rework the Arch struct to encapsulate the
arch-specific call instruction check and simplify readCoverPoints().
Also add some tests.
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Source files for Pixel devices are split between the common AOSP kernel
(path/to/kernel/aosp) and the device-specific drivers residing in a
separate dir (path/to/kernel/private/google-modules for Android 14
and path/to/kernel/gs/google-modules for older Android versions).
See https://source.android.com/docs/setup/build/building-pixel-kernels
for details.
Android build system may reference these dirs in various ways, for which
syzkaller cannot always understand where it should look for the source.
The newly introduced android_split_build flags handles the problem by adding a
list of "delimiters" used when normalizing the kernel source paths.
If the path contains any of such delimiters, then everything preceding the last
delimiter in the path is replaced with the contents of "kernel_src" from the
manager config.
By default we only support "/aosp/" and "/private/" corresponding to
modern Android systems as delimiters.
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In the case some modules' addresses are off, certain kernel addresses
returned by kcov may not have corresponding coverage callbacks in the
.ko files. Keep an additional map in the backend to verify those
addresses and report an error if that is the case.
Because GCC < 14 may tail-call coverage callbacks, the described check
is not performed for binaries which mention GCC in their .comment
section.
Also adjust text expectations in pkg/cover/report_test.go, so that
non-GCC targets check for PCs matching the callbacks.
See https://github.com/google/syzkaller/issues/4447 for more details.
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