Add support for hybrid DLLs (Arm64EC) for sampling

[PrzemekWirkus]

Cloned from: https://linaro.atlassian.net/browse/WPERF-828

We now do not support hybrid PE files (ARM64EC). When sampling users hit an assert:

wperf.exe record -v -e l1i_cache -c 0 --timeout 7 -- workload.exe

deduced image name 'workload.exe'
deduced image PDB file 'workload.pdb'
pe_file 'workload.exe', args 'workload.exe'


workload.exe pid is 26636
================================
                    KERNEL32.DLL          0x000000007ffdd5540000          C:\WINDOWS\System32\KERNEL32.DLL
                  KERNELBASE.dll          0x000000007ffdd4240000          C:\WINDOWS\System32\KERNELBASE.dll
...

base address of 'workload.exe': 0x7ff6818f12f4, runtime delta: 0x7ff5418f0000
sampling ...... done!
=================
sample generated: 154
sample dropped  : 0
sample drop rate: 0.00%
Sampling stopped, process pid=26636 exited with code 0x0000
Assertion failed: b.sec_idx, file C:\path\to\source\windowsperf\wperf\main.cpp, line 753

Additional documentation

• https://learn.microsoft.com/en-us/windows/win32/debug/pe-format#debug-directory-image-only

Regarding the assert: a little investigation:

Debug prints:

Rerunning gives tons of lines like:

VCRUNTIME140.dll has no section index for #_SomeSymbolName

Workaround:

Note: The key thing is that vcruntime140.dll is an arm64X dll, and it has two “halves” – an arm64EC side, and arm64 native side. The assert was firing on symbols from the arm64EC side (you can tell because those methods are prefixed with #).

See:

• https://gitlab.com/Linaro/WindowsPerf/windowsperf/-/merge_requests/618

[PrzemekWirkus]

I’ve added mitigation MR and I will work on a proper solution after that.