Build as a 'bin' crate, linking with rust-lld

Using the same target file as
system76/firmware-setup#14

Builds, though I don't know how to properly test it.

Author: ids1024

Cargo.toml

@@ -3,11 +3,6 @@ name = "system76_gop_policy"
 version = "1.0.0"
 edition = "2018"
 
-[lib]
-name = "system76_gop_policy"
-path = "src/lib.rs"
-crate-type = ["staticlib"]
-
 [profile.release]
 lto = true
 

Makefile

@@ -1,4 +1,4 @@
-TARGET?=x86_64-efi-pe
+TARGET?=x86_64-unknown-uefi-drv
 
 export LD=ld
 export RUST_TARGET_PATH=$(CURDIR)/targets
@@ -39,39 +39,10 @@ $(BUILD)/efi.img: $(BUILD)/boot.efi
 	mcopy -i $@.tmp $< ::driver.efi
 	mv $@.tmp $@
 
-$(BUILD)/boot.efi: $(BUILD)/boot.o
-	$(LD) \
-		-m i386pep \
-		--oformat pei-x86-64 \
-		--dll \
-		--image-base 0 \
-		--section-alignment 32 \
-		--file-alignment 32 \
-		--major-os-version 0 \
-		--minor-os-version 0 \
-		--major-image-version 0 \
-		--minor-image-version 0 \
-		--major-subsystem-version 0 \
-		--minor-subsystem-version 0 \
-		--subsystem 11 \
-		--heap 0,0 \
-		--stack 0,0 \
-		--pic-executable \
-		--entry _start \
-		--no-insert-timestamp \
-		$< -o $@
-
-$(BUILD)/boot.o: $(BUILD)/boot.a
-	rm -rf $(BUILD)/boot
-	mkdir $(BUILD)/boot
-	cd $(BUILD)/boot && ar x ../boot.a
-	ld -r $(BUILD)/boot/*.o -o $@
-
-$(BUILD)/boot.a: Cargo.lock Cargo.toml src/*
+$(BUILD)/boot.efi: Cargo.lock Cargo.toml src/*
 	mkdir -p $(BUILD)
 	cargo rustc \
 		-Z build-std=core,alloc \
-		--lib \
 		--target $(TARGET) \
 		--release \
 		-- \

gop-policy.inf

@@ -6,4 +6,4 @@
   VERSION_STRING                 = 1.0
 
 [Binaries.X64]
-  PE32|build/x86_64-efi-pe/boot.efi|*
+  PE32|build/x86_64-unknown-uefi-drv/boot.efi|*

src/lib.rs renamed to src/main.rs

@@ -1,4 +1,5 @@
 #![no_std]
+#![no_main]
 // #![feature(const_fn)]
 // #![feature(core_intrinsics)]
 #![feature(prelude_import)]

targets/x86_64-efi-pe.json

@@ -0,0 +1,40 @@
+{
+  "abi-return-struct-as-int": true,
+  "allows-weak-linkage": false,
+  "arch": "x86_64",
+  "code-model": "large",
+  "cpu": "x86-64",
+  "data-layout": "e-m:w-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128",
+  "disable-redzone": true,
+  "emit-debug-gdb-scripts": false,
+  "env": "",
+  "exe-suffix": ".efi",
+  "executables": true,
+  "features": "-mmx,-sse,+soft-float",
+  "is-builtin": true,
+  "linker": "rust-lld",
+  "linker-flavor": "lld-link",
+  "lld-flavor": "link",
+  "llvm-target": "x86_64-unknown-windows",
+  "max-atomic-width": 64,
+  "os": "uefi",
+  "panic-strategy": "abort",
+  "pre-link-args": {
+    "lld-link": [
+      "/entry:_start",
+      "/heap:0,0",
+      "/stack:0,0",
+      "/dll",
+      "/base:0",
+      "/align:32",
+      "/filealign:32",
+      "/subsystem:efi_boot_service_driver"
+    ]
+  },
+  "singlethread": true,
+  "stack-probes": true,
+  "target-c-int-width": "32",
+  "target-endian": "little",
+  "target-pointer-width": "64",
+  "vendor": "unknown"
+}