From d725d3cd472434c52e3c4bebbd7b242329d7a1b4 Mon Sep 17 00:00:00 2001
From: Lorenz Brun <lorenz@monogon.tech>
Date: Tue, 28 Sep 2021 05:21:10 +0200
Subject: [PATCH] Use the SysV ABI calling into the kernel

The original code expected to be compiled into a PE binary but
internally still using the SysV ABI. Lots of trampolines are used to
make that work as everything outside is using the MSVC ABI.
The kernel also exposes the MSVC ABI using trampolines, but only for
direct PE entrypoints. The EFI handover jump target does not do ABI
conversion and thus matches the kernel's internal ABI, which is SysV.

This means this call needs to be annotated as otherwise we'd call into
the Kernel's EFI code using the MSVC ABI which is expecting SysV.
Sigh.
---
 src/boot/efi/linux.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/boot/efi/linux.c b/src/boot/efi/linux.c
index 5232a3ba40..0d58f39ff6 100644
--- a/src/boot/efi/linux.c
+++ b/src/boot/efi/linux.c
@@ -12,7 +12,7 @@
 #define __regparm0__
 #endif
 
-typedef VOID(*handover_f)(VOID *image, EFI_SYSTEM_TABLE *table, struct boot_params *params) __regparm0__;
+typedef __attribute__((sysv_abi)) VOID(*handover_f)(VOID *image, EFI_SYSTEM_TABLE *table, struct boot_params *params) __regparm0__;
 
 static VOID linux_efi_handover(EFI_HANDLE image, struct boot_params *params) {
         handover_f handover;
-- 
2.25.1