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plugins: make test/example plugins work on windows

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Generate a qemu_plugin_api.lib delay import lib on windows, for
windows qemu plugins to link against.

Implement an example dll load fail hook to link up the API functions
correctly when a plugin is loaded on windows.

Update the build scripts for the test and example plugins to use these
things.

Signed-off-by: Greg Manning <gmanning@rapitasystems.com>
Acked-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20231102172053.17692-3-gmanning@rapitasystems.com>
[AJB: use find_program for dlltool, s/Windows/windows/]
Cc: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20231106185112.2755262-15-alex.bennee@linaro.org>
This commit is contained in:
Greg Manning 2023-11-06 18:51:04 +00:00 • committed by Alex Bennée
parent fb691b8cba
commit 330fe3b03f
5 changed files with 83 additions and 7 deletions
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34
contrib/plugins/win32_linker.c Normal file
View file

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/*
* Copyright (C) 2023, Greg Manning <gmanning@rapitasystems.com>
*
* This hook, __pfnDliFailureHook2, is documented in the microsoft documentation here:
* https://learn.microsoft.com/en-us/cpp/build/reference/error-handling-and-notification
* It gets called when a delay-loaded DLL encounters various errors.
* We handle the specific case of a DLL looking for a "qemu.exe",
* and give it the running executable (regardless of what it is named).
*
* This work is licensed under the terms of the GNU LGPL, version 2 or later.
* See the COPYING.LIB file in the top-level directory.
*/
#include <windows.h>
#include <delayimp.h>
FARPROC WINAPI dll_failure_hook(unsigned dliNotify, PDelayLoadInfo pdli);
PfnDliHook __pfnDliFailureHook2 = dll_failure_hook;
FARPROC WINAPI dll_failure_hook(unsigned dliNotify, PDelayLoadInfo pdli) {
if (dliNotify == dliFailLoadLib) {
/* If the failing request was for qemu.exe, ... */
if (strcmp(pdli->szDll, "qemu.exe") == 0) {
/* Then pass back a pointer to the top level module. */
HMODULE top = GetModuleHandle(NULL);
return (FARPROC) top;
}
}
/* Otherwise we can't do anything special. */
return 0;
}