linux-kernel - [RFC PATCH v4 1/3] selftests/x86/sgx: Fix Makefile for SGX selftest

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Date:   Fri, 12 Jul 2019 23:51:25 -0700
From:   Cedric Xing <cedric.xing@...el.com>
To:     linux-kernel@...r.kernel.org, linux-sgx@...r.kernel.org,
        jarkko.sakkinen@...ux.intel.com
Cc:     cedric.xing@...el.com, akpm@...ux-foundation.org,
        dave.hansen@...el.com, sean.j.christopherson@...el.com,
        serge.ayoun@...el.com, shay.katz-zamir@...el.com,
        haitao.huang@...el.com, kai.svahn@...el.com, kai.huang@...el.com
Subject: [RFC PATCH v4 1/3] selftests/x86/sgx: Fix Makefile for SGX selftest

The original x86/sgx/Makefile didn't work when "x86/sgx" was specified as the
test target, nor did it work with "run_tests" as the make target. Yet another
problem was that it breaks 32-bit only build. This patch fixes those problems,
along with adjustments to compiler/linker options and simplifications to the
build rules.

Signed-off-by: Cedric Xing <cedric.xing@...el.com>
---
 tools/testing/selftests/x86/sgx/Makefile | 45 +++++++++---------------
 1 file changed, 16 insertions(+), 29 deletions(-)

diff --git a/tools/testing/selftests/x86/sgx/Makefile b/tools/testing/selftests/x86/sgx/Makefile
index 1fd6f2708e81..3af15d7c8644 100644
--- a/tools/testing/selftests/x86/sgx/Makefile
+++ b/tools/testing/selftests/x86/sgx/Makefile
@@ -2,47 +2,34 @@ top_srcdir = ../../../../..
 
 include ../../lib.mk
 
-HOST_CFLAGS := -Wall -Werror -g $(INCLUDES) -fPIC
-ENCL_CFLAGS := -Wall -Werror -static -nostdlib -nostartfiles -fPIC \
+ifeq ($(shell $(CC) -dumpmachine | cut --delimiter=- -f1),x86_64)
+all: all_64
+endif
+
+HOST_CFLAGS := -Wall -Werror -g $(INCLUDES)
+ENCL_CFLAGS := -Wall -Werror -static -nostdlib -nostartfiles -fPIE \
 	       -fno-stack-protector -mrdrnd $(INCLUDES)
 
 TEST_CUSTOM_PROGS := $(OUTPUT)/test_sgx
 all_64: $(TEST_CUSTOM_PROGS)
 
-$(TEST_CUSTOM_PROGS): $(OUTPUT)/main.o $(OUTPUT)/sgx_call.o \
-		      $(OUTPUT)/encl_piggy.o
+$(TEST_CUSTOM_PROGS): main.c sgx_call.S $(OUTPUT)/encl_piggy.o
 	$(CC) $(HOST_CFLAGS) -o $@ $^
 
-$(OUTPUT)/main.o: main.c
-	$(CC) $(HOST_CFLAGS) -c $< -o $@
-
-$(OUTPUT)/sgx_call.o: sgx_call.S
-	$(CC) $(HOST_CFLAGS) -c $< -o $@
-
-$(OUTPUT)/encl_piggy.o: $(OUTPUT)/encl.bin $(OUTPUT)/encl.ss
-	$(CC) $(HOST_CFLAGS) -c encl_piggy.S -o $@
+$(OUTPUT)/encl_piggy.o: encl_piggy.S $(OUTPUT)/encl.bin $(OUTPUT)/encl.ss
+	$(CC) $(HOST_CFLAGS) -I$(OUTPUT) -c $< -o $@
 
-$(OUTPUT)/encl.bin: $(OUTPUT)/encl.elf $(OUTPUT)/sgxsign
+$(OUTPUT)/encl.bin: $(OUTPUT)/encl.elf
 	objcopy --remove-section=.got.plt -O binary $< $@
 
-$(OUTPUT)/encl.elf: $(OUTPUT)/encl.o $(OUTPUT)/encl_bootstrap.o
-	$(CC) $(ENCL_CFLAGS) -T encl.lds -o $@ $^
+$(OUTPUT)/encl.elf: encl.lds encl.c encl_bootstrap.S
+	$(CC) $(ENCL_CFLAGS) -T $^ -o $@
 
-$(OUTPUT)/encl.o: encl.c
-	$(CC) $(ENCL_CFLAGS) -c $< -o $@
-
-$(OUTPUT)/encl_bootstrap.o: encl_bootstrap.S
-	$(CC) $(ENCL_CFLAGS) -c $< -o $@
-
-$(OUTPUT)/encl.ss: $(OUTPUT)/encl.bin  $(OUTPUT)/sgxsign
-	$(OUTPUT)/sgxsign signing_key.pem $(OUTPUT)/encl.bin $(OUTPUT)/encl.ss
+$(OUTPUT)/encl.ss: $(OUTPUT)/sgxsign signing_key.pem $(OUTPUT)/encl.bin
+	$^ $@
 
 $(OUTPUT)/sgxsign: sgxsign.c
 	$(CC) -o $@ $< -lcrypto
 
-EXTRA_CLEAN := $(OUTPUT)/sgx-selftest $(OUTPUT)/sgx-selftest.o \
-	       $(OUTPUT)/sgx_call.o $(OUTPUT)/encl.bin $(OUTPUT)/encl.ss \
-	       $(OUTPUT)/encl.elf $(OUTPUT)/encl.o $(OUTPUT)/encl_bootstrap.o \
-	       $(OUTPUT)/sgxsign
-
-.PHONY: clean
+EXTRA_CLEAN := $(TEST_CUSTOM_PROGS) $(addprefix $(OUTPUT)/,	\
+		encl.elf encl.bin encl.ss encl_piggy.o sgxsign)
-- 
2.17.1