[Xen-devel] [PATCH v4 09/16] livepatch: tests: Make them compile under ARM64

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

We need to two things:
1) Wrap the platform-specific objcopy parameters in defines
   The input and output parameters for $(OBJCOPY) are different
   based on the platforms. As such provide them in the
   OBJCOPY_MAGIC define and use that.

2) The alternative is a bit different and there are no
   exceptions under ARM (but there are under ARM 64).
   Also use one of the first config options for the CPU
   field feature.

We are not yet attempting to build them under ARM32 so
that is still ifdefed out.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>

---
Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Cc: George Dunlap <George.Dunlap@xxxxxxxxxxxxx>
Cc: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
Cc: Jan Beulich <jbeulich@xxxxxxxx>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>
Cc: Tim Deegan <tim@xxxxxxx>
Cc: Wei Liu <wei.liu2@xxxxxxxxxx>

v1: First submission
v2: Corrected description by Julien
    Add #ifeq instead of #else for ARM case.
v3: Moved 'asm(alter..)' by one space to the left.
v4: Rebase on top of "livepatch/tests: Make .livepatch.depends be read-only"
---
 xen/test/Makefile                         |  2 +-
 xen/test/livepatch/Makefile               | 12 ++++++++++--
 xen/test/livepatch/xen_hello_world_func.c |  8 +++++++-
 3 files changed, 18 insertions(+), 4 deletions(-)

diff --git a/xen/test/Makefile b/xen/test/Makefile
index 8c53040..95c1755 100644
--- a/xen/test/Makefile
+++ b/xen/test/Makefile
@@ -1,6 +1,6 @@
 .PHONY: tests
 tests:
-ifeq ($(XEN_TARGET_ARCH),x86_64)
+ifneq $(XEN_TARGET_ARCH),arm32)
        $(MAKE) -f $(BASEDIR)/Rules.mk -C livepatch livepatch
 endif
 
diff --git a/xen/test/livepatch/Makefile b/xen/test/livepatch/Makefile
index 48ff843..5db4d9c 100644
--- a/xen/test/livepatch/Makefile
+++ b/xen/test/livepatch/Makefile
@@ -1,5 +1,12 @@
 include $(XEN_ROOT)/Config.mk
 
+ifeq ($(XEN_TARGET_ARCH),x86_64)
+OBJCOPY_MAGIC := -I binary -O elf64-x86-64 -B i386:x86-64
+endif
+ifeq ($(XEN_TARGET_ARCH),arm64)
+OBJCOPY_MAGIC := -I binary -O elf64-littleaarch64 -B aarch64
+endif
+
 CODE_ADDR=$(shell nm --defined $(1) | grep $(2) | awk '{print "0x"$$1}')
 CODE_SZ=$(shell nm --defined -S $(1) | grep $(2) | awk '{ print "0x"$$2}')
 
@@ -54,8 +61,9 @@ $(LIVEPATCH): xen_hello_world_func.o xen_hello_world.o note.o
 .PHONY: note.o
 note.o:
        $(OBJCOPY) -O binary --only-section=.note.gnu.build-id 
$(BASEDIR)/xen-syms $@.bin
-       $(OBJCOPY) -I binary -O elf64-x86-64 -B i386:x86-64 \
+       $(OBJCOPY) $(OBJCOPY_MAGIC) \
                   
--rename-section=.data=.livepatch.depends,alloc,load,readonly,data,contents -S 
$@.bin $@
+                  --rename-section=.data=.livepatch.depends -S $@.bin $@
        rm -f $@.bin
 
 #
@@ -65,7 +73,7 @@ note.o:
 .PHONY: hello_world_note.o
 hello_world_note.o: $(LIVEPATCH)
        $(OBJCOPY) -O binary --only-section=.note.gnu.build-id $(LIVEPATCH) 
$@.bin
-       $(OBJCOPY)  -I binary -O elf64-x86-64 -B i386:x86-64 \
+       $(OBJCOPY) $(OBJCOPY_MAGIC) \
                   
--rename-section=.data=.livepatch.depends,alloc,load,readonly,data,contents -S 
$@.bin $@
        rm -f $@.bin
 
diff --git a/xen/test/livepatch/xen_hello_world_func.c 
b/xen/test/livepatch/xen_hello_world_func.c
index 03d6b84..6f53ab4 100644
--- a/xen/test/livepatch/xen_hello_world_func.c
+++ b/xen/test/livepatch/xen_hello_world_func.c
@@ -6,14 +6,17 @@
 #include <xen/types.h>
 
 #include <asm/alternative.h>
+#ifdef CONFIG_X86
 #include <asm/nops.h>
 #include <asm/uaccess.h>
 
 static unsigned long *non_canonical_addr = (unsigned long 
*)0xdead000000000000ULL;
+#endif
 
 /* Our replacement function for xen_extra_version. */
 const char *xen_hello_world(void)
 {
+#ifdef CONFIG_X86
     unsigned long tmp;
     int rc;
 
@@ -24,7 +27,10 @@ const char *xen_hello_world(void)
      */
     rc = __get_user(tmp, non_canonical_addr);
     BUG_ON(rc != -EFAULT);
-
+#endif
+#ifdef CONFIG_ARM_64
+    asm(ALTERNATIVE("nop", "nop", ARM64_WORKAROUND_CLEAN_CACHE));
+#endif
     return "Hello World";
 }
 
-- 
2.5.5


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