From 7a37ec94fbdf6a4a058f4094b9326387786e19b3 Mon Sep 17 00:00:00 2001
From: Regia König
Date: Tue, 16 Aug 2022 12:03:17 +0200
Subject: Start new project: Create a HelloWorld.efi with GNU-efi

---
 GNU_efi_HelloWorld/Makefile |  31 +++++++++++++++++++++++++++++++
 GNU_efi_HelloWorld/hello.c  |  11 +++++++++++
 GNU_efi_HelloWorld/hello.o  | Bin 0 -> 1696 bytes
 3 files changed, 42 insertions(+)
 create mode 100644 GNU_efi_HelloWorld/Makefile
 create mode 100644 GNU_efi_HelloWorld/hello.c
 create mode 100644 GNU_efi_HelloWorld/hello.o

diff --git a/GNU_efi_HelloWorld/Makefile b/GNU_efi_HelloWorld/Makefile
new file mode 100644
index 0000000..4f00d4a
--- /dev/null
+++ b/GNU_efi_HelloWorld/Makefile
@@ -0,0 +1,31 @@
+ARCH		= $(shell uname -m | sed s,i[3456789]86,ia32,)
+
+OBJS		= main.o
+TARGET		= hello.efi
+
+EFIINC		= /usr/include/efi
+EFFINCS		= -I$(EFFINC) -I$(EFIINC)/$(ARCH) -I$(EFIINC)/protocol
+LIB		= /usr/lib64
+EFILIB		= /usr/lib64/gnuefi
+EFI_CRT_OBJS	= $(EFILIB)/crt0-efi-$(ARCH).o
+EFI_LDS		= $(EFILIB)/elf_$(ARCH)_efi.lds
+
+CFLAGS		= $(EFFINCS) -fno-stack-protector -fpic \
+			-fshort-wchar -mno-red-zone -Wall
+
+ifeq ($(ARCH),x86_64)
+	CFLAGS += -DEFI_FUNCTION_WRAPPER
+endif
+
+LDFLAGS		= -nostdlib -znocombreloc -T $(EFI_LDS) -shared \
+			-Bsymbolic -L $(EFILIB) -L $(LIB) $(EFI_CRT_OBJS)
+
+all: $(TARGET)
+
+hello.so: $(OBJS)
+	ld $(LDFLAGS) $(OBJS) -o $@ -lefi -lgnuefi
+
+%.efi: %.so
+	objcopy -j .text -j .sdata -j .data -j .dynamic \
+	-j .dynsym -j .rel -j .rela -j .reloc \
+	--target=efi-app-$(ARCH) $^ $@
diff --git a/GNU_efi_HelloWorld/hello.c b/GNU_efi_HelloWorld/hello.c
new file mode 100644
index 0000000..26cbd42
--- /dev/null
+++ b/GNU_efi_HelloWorld/hello.c
@@ -0,0 +1,11 @@
+#include <efi.h>
+#include <efilib.h>
+
+EFI_STATUS
+EFIAPI
+efi_main (EFI_HANDLE ImageHandle, EFI_SYSTEM_TABLE *SystemTable) {
+	InitializeLib(ImageHandle, SystemTable);
+	Print(L"Hello, world!\n");
+
+	return EFI_SUCCESS;
+}
diff --git a/GNU_efi_HelloWorld/hello.o b/GNU_efi_HelloWorld/hello.o
new file mode 100644
index 0000000..6e14a71
Binary files /dev/null and b/GNU_efi_HelloWorld/hello.o differ
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