From 3d91b47b425ffb880c0ed6c45fd04ba48d95ca8d Mon Sep 17 00:00:00 2001
From: Jakub Czapiga <jacz@semihalf.com>
Date: Wed, 15 Sep 2021 14:52:45 +0200
Subject: libpayload: Add mock architecture

Mock architecture can be used to build libpayload using host compiler.
It can be enabled by setting ARCH_MOCK=y in the dotconfig. It sets
LITTLE_ENDIAN=y, as most machines these days use little-endian CPUs.
Libpayload will use HOSTCC as CC, HOSTLD as LD, etc. instead of tools
provided by xcompile.
Mock architecture configuration can be used by payloads for testing
purposes. Thanks to it, tests can be architecture-independent,
and can be executed without requiring compatible Kconfig options,
e.g. ARCH_ARM64=y for ARM64 machine. However, one has to provide
implementation for most architecture-specific functions present
in arch/* directories.

Signed-off-by: Jakub Czapiga <jacz@semihalf.com>
Change-Id: Ie3a6e6f6cad2f8a2e48a8e546d3b79c577653080
Reviewed-on: https://review.coreboot.org/c/coreboot/+/57708
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>
---
 payloads/libpayload/Makefile | 41 ++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 40 insertions(+), 1 deletion(-)

(limited to 'payloads/libpayload/Makefile')

diff --git a/payloads/libpayload/Makefile b/payloads/libpayload/Makefile
index 90f6b23836..923106248c 100644
--- a/payloads/libpayload/Makefile
+++ b/payloads/libpayload/Makefile
@@ -74,6 +74,14 @@ HOSTCC = gcc
 HOSTCXX = g++
 HOSTCFLAGS := -I$(srck) -I$(objk) -g
 HOSTCXXFLAGS := -I$(srck) -I$(objk)
+HOSTAS ?= as
+HOSTLD ?= ld
+HOSTNM ?= nm
+HOSTOBJCOPY ?= objcopy
+HOSTOBJDUMP ?= objdump
+HOSTREADELF ?= readelf
+HOSTSTRIP ?= strip
+HOSTAR ?= ar
 
 DOXYGEN := doxygen
 DOXYGEN_OUTPUT_DIR := doxygen
@@ -95,6 +103,7 @@ include $(HAVE_DOTCONFIG)
 ARCHDIR-$(CONFIG_LP_ARCH_ARM)     := arm
 ARCHDIR-$(CONFIG_LP_ARCH_ARM64)   := arm64
 ARCHDIR-$(CONFIG_LP_ARCH_X86)     := x86
+ARCHDIR-$(CONFIG_LP_ARCH_MOCK)    := mock
 
 ARCH-y := $(ARCHDIR-y)
 
@@ -103,6 +112,7 @@ ARCH-y := $(ARCHDIR-y)
 ARCH-$(CONFIG_LP_ARCH_ARM)     := arm
 ARCH-$(CONFIG_LP_ARCH_ARM64)   := arm64
 ARCH-$(CONFIG_LP_ARCH_X86)     := x86_32
+ARCH-$(CONFIG_LP_ARCH_MOCK)    := mock
 
 # Three cases where we don't need fully populated $(obj) lists:
 # 1. when no .config exists
@@ -129,6 +139,31 @@ real-all: config
 
 else
 
+ifeq ($(CONFIG_LP_ARCH_MOCK),y)
+
+# Create empty xcompile to satisfy install script
+$(shell echo '' > $(xcompile))
+
+CC := $(HOSTCC)
+CC-mock := $(HOSTCC)
+AS := $(HOSTAS)
+AS-mock := $(HOSTAS)
+LD := $(HOSTLD)
+LD-mock := $(HOSTLD)
+NM := $(HOSTNM)
+NM-mock := $(HOSTNM)
+OBJCOPY := $(HOSTOBJCOPY)
+OBJCOPY-mock := $(HOSTOBJCOPY)
+OBJDUMP := $(HOSTOBJDUMP)
+OBJDUMP-mock := $(HOSTOBJDUMP)
+READELF := $(HOSTREADELF)
+READELF-mock := $(HOSTEADELF)
+STRIP := $(HOSTSTRIP)
+STRIP-mock := $(HOSTSTRIP)
+AR := $(HOSTAR)
+AR-mock := $(HOSTAR)
+else
+
 # in addition to the dependency below, create the file if it doesn't exist
 # to silence stupid warnings about a file that would be generated anyway.
 $(if $(wildcard $(xcompile)),,$(shell	\
@@ -152,12 +187,16 @@ OBJDUMP := $(OBJDUMP_$(ARCH-y))
 READELF := $(READELF_$(ARCH-y))
 STRIP := $(STRIP_$(ARCH-y))
 AR := $(AR_$(ARCH-y))
+endif
 
 CFLAGS += -std=gnu11 $(CFLAGS_$(ARCH-y))
 
 ifneq ($(INNER_SCANBUILD),y)
 ifeq ($(CONFIG_LP_COMPILER_LLVM_CLANG),y)
-CC:=clang -m32
+CC:=clang
+ifneq ($(CONFIG_LP_ARCH_MOCK),y)
+CC += -m32
+endif
 HOSTCC:=clang
 endif
 endif
-- 
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