efi_loader: support building UEFI binaries on sandbox

On the sandbox the UEFI binaries must match the host architectures.

Adjust the Makefiles. Provide the PE/COFF header and relocation files.

Allow building helloworld.efi on the sandbox.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>

Makefile

@@ -17,6 +17,25 @@ NAME =
 # o Look for make include files relative to root of kernel src
 MAKEFLAGS += -rR --include-dir=$(CURDIR)
 
+# Determine host architecture
+include include/host_arch.h
+MK_ARCH="${shell uname -m}"
+unexport HOST_ARCH
+ifeq ("x86_64", $(MK_ARCH))
+  export HOST_ARCH=$(HOST_ARCH_X86_64)
+else ifneq (,$(findstring $(MK_ARCH), "i386" "i486" "i586" "i686"))
+  export HOST_ARCH=$(HOST_ARCH_X86)
+else ifneq (,$(findstring $(MK_ARCH), "aarch64" "armv8l"))
+  export HOST_ARCH=$(HOST_ARCH_AARCH64)
+else ifeq ("armv7l", $(MK_ARCH))
+  export HOST_ARCH=$(HOST_ARCH_ARM)
+else ifeq ("riscv32", $(MK_ARCH))
+  export HOST_ARCH=$(HOST_ARCH_RISCV32)
+else ifeq ("riscv64", $(MK_ARCH))
+  export HOST_ARCH=$(HOST_ARCH_RISCV64)
+endif
+undefine MK_ARCH
+
 # Avoid funny character set dependencies
 unexport LC_ALL
 LC_COLLATE=C

arch/sandbox/config.mk

@@ -27,3 +27,31 @@ cmd_u-boot-spl = (cd $(obj) && $(CC) -o $(SPL_BIN) -Wl,-T u-boot-spl.lds \
 	$(PLATFORM_LIBS) -Wl,-Map -Wl,u-boot-spl.map -Wl,--gc-sections)
 
 CONFIG_ARCH_DEVICE_TREE := sandbox
+
+ifeq ($(HOST_ARCH),$(HOST_ARCH_X86_64))
+EFI_LDS := ${SRCDIR}/../../../arch/x86/lib/elf_x86_64_efi.lds
+EFI_TARGET := --target=efi-app-x86_64
+else ifeq ($(HOST_ARCH),$(HOST_ARCH_X86))
+EFI_LDS := ${SRCDIR}/../../../arch/x86/lib/elf_ia32_efi.lds
+EFI_TARGET := --target=efi-app-ia32
+else ifeq ($(HOST_ARCH),$(HOST_ARCH_AARCH64))
+EFI_LDS := ${SRCDIR}/../../../arch/arm/lib/elf_aarch64_efi.lds
+OBJCOPYFLAGS += -j .text -j .secure_text -j .secure_data -j .rodata -j .data \
+		-j .u_boot_list -j .rela.dyn -j .got -j .got.plt \
+		-j .binman_sym_table -j .text_rest \
+		-j .efi_runtime -j .efi_runtime_rel
+else ifeq ($(HOST_ARCH),$(HOST_ARCH_ARM))
+EFI_LDS := ${SRCDIR}/../../../arch/arm/lib/elf_arm_efi.lds
+OBJCOPYFLAGS += -j .text -j .secure_text -j .secure_data -j .rodata -j .hash \
+		-j .data -j .got -j .got.plt -j .u_boot_list -j .rel.dyn \
+		-j .binman_sym_table -j .text_rest \
+		-j .efi_runtime -j .efi_runtime_rel
+else ifeq ($(HOST_ARCH),$(HOST_ARCH_RISCV32))
+EFI_LDS := ${SRCDIR}/../../../arch/riscv/lib/elf_riscv32_efi.lds
+else ifeq ($(HOST_ARCH),$(HOST_ARCH_RISCV64))
+EFI_LDS := ${SRCDIR}/../../../arch/riscv/lib/elf_riscv64_efi.lds
+endif
+EFI_CRT0 := crt0_sandbox_efi.o
+EFI_RELOC := reloc_sandbox_efi.o
+AFLAGS_crt0_sandbox_efi.o += -DHOST_ARCH="$(HOST_ARCH)"
+CFLAGS_reloc_sandbox_efi.o += -DHOST_ARCH="$(HOST_ARCH)"

arch/sandbox/lib/crt0_sandbox_efi.S

@@ -0,0 +1,32 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * PE/COFF header for EFI applications
+ *
+ * Copyright (c) 2019 Heinrich Schuchardt
+ */
+
+#include <host_arch.h>
+
+#if HOST_ARCH == HOST_ARCH_X86_64
+#include "../../../arch/x86/lib/crt0_x86_64_efi.S"
+#endif
+
+#if HOST_ARCH == HOST_ARCH_X86
+#include "../../../arch/x86/lib/crt0_ia32_efi.S"
+#endif
+
+#if HOST_ARCH == HOST_ARCH_AARCH64
+#include "../../../arch/arm/lib/crt0_aarch64_efi.S"
+#endif
+
+#if HOST_ARCH == HOST_ARCH_ARM
+#include "../../../arch/arm/lib/crt0_arm_efi.S"
+#endif
+
+#if HOST_ARCH == HOST_ARCH_RISCV32
+#include "../../../arch/riscv/lib/crt0_riscv_efi.S"
+#endif
+
+#if HOST_ARCH == HOST_ARCH_RISCV64
+#include "../../../arch/riscv/lib/crt0_riscv_efi.S"
+#endif

arch/sandbox/lib/reloc_sandbox_efi.c

@@ -0,0 +1,32 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * position independent shared object relocator
+ *
+ * Copyright (c) 2019 Heinrich Schuchardt
+ */
+
+#include <host_arch.h>
+
+#if HOST_ARCH == HOST_ARCH_X86_64
+#include "../../../arch/x86/lib/reloc_x86_64_efi.c"
+#endif
+
+#if HOST_ARCH == HOST_ARCH_X86
+#include "../../../arch/x86/lib/reloc_ia32_efi.c"
+#endif
+
+#if HOST_ARCH == HOST_ARCH_AARCH64
+#include "../../../arch/arm/lib/reloc_aarch64_efi.c"
+#endif
+
+#if HOST_ARCH == HOST_ARCH_ARM
+#include "../../../arch/arm/lib/reloc_arm_efi.c"
+#endif
+
+#if HOST_ARCH == HOST_ARCH_RISCV32
+#include "../../../arch/riscv/lib/reloc_riscv_efi.c"
+#endif
+
+#if HOST_ARCH == HOST_ARCH_RISCV64
+#include "../../../arch/riscv/lib/reloc_riscv_efi.c"
+#endif

cmd/Kconfig

@@ -320,7 +320,7 @@ config CMD_BOOTEFI
 
 config CMD_BOOTEFI_HELLO_COMPILE
 	bool "Compile a standard EFI hello world binary for testing"
-	depends on CMD_BOOTEFI && !CPU_V7M && !SANDBOX
+	depends on CMD_BOOTEFI && !CPU_V7M
 	default y
 	help
 	  This compiles a standard EFI hello world application with U-Boot so

include/host_arch.h

@@ -0,0 +1,24 @@
+#if 0
+# SPDX SPDX-License-Identifier: GPL-2.0+
+#
+# Constants defining the host architecture in assembler, C, and make files.
+# The values are arbitrary.
+#
+# Copyright 2019 Heinrich Schuchardt <xypron.glpk@gmx.de>
+#endif
+
+#if 0
+export HOST_ARCH_AARCH64=0xaa64
+export HOST_ARCH_ARM=0x00a7
+export HOST_ARCH_RISCV32=0x5032
+export HOST_ARCH_RISCV64=0x5064
+export HOST_ARCH_X86=0x0386
+export HOST_ARCH_X86_64=0x8664
+#endif
+
+#define HOST_ARCH_AARCH64 0xaa64
+#define HOST_ARCH_ARM 0x00a7
+#define HOST_ARCH_RISCV32 0x5032
+#define HOST_ARCH_RISCV64 0x5064
+#define HOST_ARCH_X86 0x0386
+#define HOST_ARCH_X86_64 0x8664

lib/efi_loader/Makefile

@@ -6,6 +6,9 @@
 # This file only gets included with CONFIG_EFI_LOADER set, so all
 # object inclusion implicitly depends on it
 
+asflags-y += -DHOST_ARCH="$(HOST_ARCH)"
+ccflags-y += -DHOST_ARCH="$(HOST_ARCH)"
+
 CFLAGS_efi_boottime.o += \
   -DFW_VERSION="0x$(VERSION)" \
   -DFW_PATCHLEVEL="0x$(PATCHLEVEL)"