[U-Boot] [PATCH v3 15/28] x86: Support building the EFI stub

[Simon Glass]

Add support for building a 32/64-bit EFI stub for x86. This involves
building the startup and relocation code for either i386 or x86_64.

Signed-off-by: Simon Glass <sjg at chromium.org>
---

Changes in v3:
- Move 64-bit comment to just above the 64-bit flag adjustments

Changes in v2:
- Add a comment as to why the AFLAGS_REMOVE_.. lines are needed
- Move the crt and reloc files into arch/x86/lib/efi/

 arch/x86/lib/Makefile     |  2 +-
 arch/x86/lib/efi/Makefile | 24 ++++++++++++++++++++++++
 2 files changed, 25 insertions(+), 1 deletion(-)
 create mode 100644 arch/x86/lib/efi/Makefile

diff --git a/arch/x86/lib/Makefile b/arch/x86/lib/Makefile
index 43489fd..09c236b 100644
--- a/arch/x86/lib/Makefile
+++ b/arch/x86/lib/Makefile
@@ -34,7 +34,7 @@ obj-$(CONFIG_SYS_X86_TSC_TIMER)	+= tsc_timer.o
 obj-$(CONFIG_CMD_ZBOOT)	+= zimage.o
 obj-$(CONFIG_HAVE_FSP) += fsp/
 
-extra-$(CONFIG_USE_PRIVATE_LIBGCC) := lib.a
+extra-$(CONFIG_USE_PRIVATE_LIBGCC) += lib.a
 
 NORMAL_LIBGCC = $(shell $(CC) $(PLATFORM_CPPFLAGS) -print-libgcc-file-name)
 OBJCOPYFLAGS := --prefix-symbols=__normal_
diff --git a/arch/x86/lib/efi/Makefile b/arch/x86/lib/efi/Makefile
new file mode 100644
index 0000000..bb7b95b
--- /dev/null
+++ b/arch/x86/lib/efi/Makefile
@@ -0,0 +1,24 @@
+#
+# (C) Copyright 2002-2006
+# Wolfgang Denk, DENX Software Engineering, wd at denx.de.
+#
+# SPDX-License-Identifier:	GPL-2.0+
+#
+
+obj-$(CONFIG_EFI_APP) += crt0-efi-ia32.o reloc_ia32.o
+
+ifneq ($(CONFIG_EFI_STUB),)
+
+CFLAGS_REMOVE_reloc_ia32.o += -mregparm=3
+CFLAGS_reloc_ia32.o += -fpic -fshort-wchar
+
+# When building for 64-bit we must remove the i386-specific flags
+CFLAGS_REMOVE_reloc_x86_64.o += -mregparm=3 -march=i386 -m32
+CFLAGS_reloc_x86_64.o += -fpic -fshort-wchar
+
+AFLAGS_REMOVE_crt0-efi-x86_64.o += -mregparm=3 -march=i386 -m32
+AFLAGS_crt0-efi-x86_64.o += -fpic -fshort-wchar
+
+extra-$(CONFIG_EFI_STUB_32BIT) += crt0-efi-ia32.o reloc_ia32.o
+extra-$(CONFIG_EFI_STUB_64BIT) += crt0-efi-x86_64.o reloc_x86_64.o
+endif
-- 
2.5.0.rc2.392.g76e840b