From d6c9603c41b3d11400cee7b5b409203af0632aa2 Mon Sep 17 00:00:00 2001
From: Paul Burton <paul.burton@imgtec.com>
Date: Tue, 27 May 2014 15:18:42 +0100
Subject: [PATCH] build: mipsel cross compiler support

This patch introduces support for building a MIPS cross compiler
targetting little endian machines by default.

Change-Id: I116f6f431cdf80f5f5f58d2743357a9f70a7347d
Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Reviewed-on: https://chromium-review.googlesource.com/207970
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: David Hendricks <dhendrix@chromium.org>
---
 toolchain.inc          |  6 +++++-
 util/crossgcc/Makefile |  2 ++
 util/xcompile/xcompile | 11 ++++++++++-
 3 files changed, 17 insertions(+), 2 deletions(-)

diff --git a/toolchain.inc b/toolchain.inc
index 86e8b60363..6dd88c3611 100644
--- a/toolchain.inc
+++ b/toolchain.inc
@@ -19,11 +19,12 @@
 
 #######################################################################
 
-ARCH_SUPPORTED := ARM ARM64 X86_32
+ARCH_SUPPORTED := ARM ARM64 X86_32 MIPS
 
 ARCH_TO_TOOLCHAIN_X86_32 := x86_32
 ARCH_TO_TOOLCHAIN_ARM    := arm
 ARCH_TO_TOOLCHAIN_ARM64  := arm64
+ARCH_TO_TOOLCHAIN_MIPS   := mipsel
 
 COREBOOT_STANDARD_STAGES := bootblock verstage romstage ramstage
 
@@ -31,10 +32,13 @@ ARCHDIR-i386      := x86
 ARCHDIR-arm       := arm
 ARCHDIR-arm64     := arm64
 ARCHDIR-x86_32    := x86
+ARCHDIR-mipsel    := mips
 
 CFLAGS_arm          := -mno-unaligned-access -ffunction-sections -fdata-sections
 CFLAGS_arm64        := -ffunction-sections -fdata-sections
 
+CFLAGS_mipsel     := -mips32r2 -G 0
+
 toolchain_to_dir = \
 	$(foreach arch,$(ARCH_SUPPORTED),\
 	$(eval INCLUDES_$(ARCH_TO_TOOLCHAIN_$(arch)) = \
diff --git a/util/crossgcc/Makefile b/util/crossgcc/Makefile
index 3d7739206b..209ce67426 100644
--- a/util/crossgcc/Makefile
+++ b/util/crossgcc/Makefile
@@ -4,12 +4,14 @@ build:
 	bash ./buildgcc -G -p i386-elf
 	bash ./buildgcc -G -p armv7a-eabi
 	bash ./buildgcc -G -p aarch64-elf
+	bash ./buildgcc -G -p mipsel-elf
 
 .PHONY: build-without-gdb
 build-without-gdb:
 	bash ./buildgcc -p i386-elf
 	bash ./buildgcc -p armv7a-eabi
 	bash ./buildgcc -p aarch64-elf
+	bash ./buildgcc -p mipsel-elf
 
 clean:
 	rm -rf xgcc
diff --git a/util/xcompile/xcompile b/util/xcompile/xcompile
index cb5eb09aad..5215c48f58 100644
--- a/util/xcompile/xcompile
+++ b/util/xcompile/xcompile
@@ -115,6 +115,9 @@ detect_special_flags() {
 	arm )
 		testcc "$CC" "$CFLAGS" && CFLAGS="$CFLAGS"
 		;;
+	mipsel )
+		testcc "$CC" "$CFLAGS"
+		;;
 	esac
 }
 
@@ -140,7 +143,7 @@ touch "$TMPFILE"
 trap clean_up EXIT
 
 # Architecture definition
-SUPPORTED_ARCHITECTURE="x86 arm aarch64"
+SUPPORTED_ARCHITECTURE="x86 arm aarch64 mipsel"
 
 # ARM Architecture
 TARCH_arm="arm"
@@ -161,6 +164,12 @@ TCLIST_x86="i386 x86_64"
 TWIDTH_x86="32"
 XGCCPATH=${1:-"`pwd`/util/crossgcc/xgcc/bin/"}
 
+# MIPS Architecture (Little Endian)
+TARCH_mipsel="mipsel"
+TBFDARCH_mipsel="littlemips"
+TCLIST_mipsel="mipsel"
+TWIDTH_mipsel="32"
+
 # This loops over all supported architectures.
 for architecture in $SUPPORTED_ARCHITECTURE; do
 	GCCPREFIX="invalid"