ltp: don't use host objcopy

The kernel/kvm test uses the host objcopy when building a payload, but
the host objcopy might not know how to deal with target binaries:

  CC testcases/kernel/kvm/lib_host.o
  objcopy: Unable to recognise the format of the input file `kvm_svm03-payload.elf'
  make[3]: *** [ltp/testcases/kernel/kvm/Makefile:67: kvm_svm03-payload.o] Error 1

Solve this by using the host-prefixed objcopy binary.

(From OE-Core rev: 74818f79bd9a206f77ae3d26b19657116fd956cc)

Signed-off-by: Ross Burton <ross.burton@arm.com>
Signed-off-by: Mathieu Dubois-Briand <mathieu.dubois-briand@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-extended/ltp/ltp/0001-kernel-kvm-don-t-hardcode-objcopy.patch

@@ -0,0 +1,69 @@
+From 0a42a8ee0ae8c6f1e603c1836b7c9c7fab0ca3a8 Mon Sep 17 00:00:00 2001
+From: Ross Burton <ross.burton@arm.com>
+Date: Thu, 27 Feb 2025 12:38:50 +0000
+Subject: [PATCH] kernel/kvm: don't hardcode objcopy
+
+testcases/kernel/kvm uses objcopy to contruct a payload binary, but in
+cross builds the host objcopy may not know how to handle target
+binaries:
+
+ CC testcases/kernel/kvm/lib_host.o
+ objcopy: Unable to recognise the format of the input file `kvm_svm03-payload.elf'
+ make[3]: *** [ltp/testcases/kernel/kvm/Makefile:67: kvm_svm03-payload.o] Error 1
+
+This is trivially fixed by searching for an objcopy tool (so
+host-prefixed in cross builds) and using that instead.
+
+Upstream-Status: Backport [a3942c0a5f9b4463e8320e80cd8522a2e008bfd2]
+Signed-off-by: Ross Burton <ross.burton@arm.com>
+---
+ configure.ac                  | 1 +
+ include/mk/config.mk.in       | 1 +
+ testcases/kernel/kvm/Makefile | 4 ++--
+ 3 files changed, 4 insertions(+), 2 deletions(-)
+
+diff --git a/configure.ac b/configure.ac
+index 344b2ae2c..0f2b6f332 100644
+--- a/configure.ac
++++ b/configure.ac
+@@ -30,6 +30,7 @@ AC_PROG_RANLIB
+ AC_DEFUN([AC_PROG_STRIP], [AC_CHECK_TOOL(STRIP, strip, :)])
+ AC_PROG_STRIP
+ AC_PROG_YACC
++AC_CHECK_TOOL([OBJCOPY], [objcopy], [:])
+ 
+ m4_ifndef([PKG_CHECK_EXISTS],
+ 	[m4_fatal([must install pkg-config or pkgconfig and pkg.m4 macro (usual dependency), see INSTALL])])
+diff --git a/include/mk/config.mk.in b/include/mk/config.mk.in
+index 2b7c8a071..4c3da304f 100644
+--- a/include/mk/config.mk.in
++++ b/include/mk/config.mk.in
+@@ -11,6 +11,7 @@ AR			:= @AR@
+ CC			:= @CC@
+ LEX			:= @LEX@
+ RANLIB			:= @RANLIB@
++OBJCOPY			:= @OBJCOPY@
+ STRIP			:= @STRIP@
+ YACC			:= @YACC@
+ 
+diff --git a/testcases/kernel/kvm/Makefile b/testcases/kernel/kvm/Makefile
+index 07bdd9705..e93528a33 100644
+--- a/testcases/kernel/kvm/Makefile
++++ b/testcases/kernel/kvm/Makefile
+@@ -60,11 +60,11 @@ include $(top_srcdir)/include/mk/generic_leaf_target.mk
+ %-payload.o: %.c lib_guest.o $(ARCH_OBJ)
+ ifdef VERBOSE
+ 	$(CC) $(GUEST_CPPFLAGS) $(GUEST_CFLAGS) $(GUEST_LDFLAGS) -o $*-payload.elf $^ $(GUEST_LDLIBS)
+-	objcopy -O binary -j .init.boot -j .text -j .data -j .init -j .preinit_array -j .init_array --gap-fill=0 $*-payload.elf $*-payload.bin
++	$(OBJCOPY) -O binary -j .init.boot -j .text -j .data -j .init -j .preinit_array -j .init_array --gap-fill=0 $*-payload.elf $*-payload.bin
+ 	$(KVM_LD) -z noexecstack -r -T $(abs_srcdir)/linker/payload.lds --oformat=$(BIN_FORMAT) -o $@ $*-payload.bin
+ else
+ 	@$(CC) $(GUEST_CPPFLAGS) $(GUEST_CFLAGS) $(GUEST_LDFLAGS) -o $*-payload.elf $^ $(GUEST_LDLIBS)
+-	@objcopy -O binary -j .init.boot -j .text -j .data -j .init -j .preinit_array -j .init_array --gap-fill=0 $*-payload.elf $*-payload.bin
++	@$(OBJCOPY) -O binary -j .init.boot -j .text -j .data -j .init -j .preinit_array -j .init_array --gap-fill=0 $*-payload.elf $*-payload.bin
+ 	@$(KVM_LD) -z noexecstack -r -T $(abs_srcdir)/linker/payload.lds --oformat=$(BIN_FORMAT) -o $@ $*-payload.bin
+ 	@echo KVM_CC $(target_rel_dir)$@
+ endif
+-- 
+2.43.0
+

meta/recipes-extended/ltp/ltp_20250130.bb

@@ -29,6 +29,7 @@ SRCREV = "a7c31dff7edc089a32e990765e12952cc4d7666a"
 SRC_URI = "git://github.com/linux-test-project/ltp.git;branch=master;protocol=https \
            file://0001-Remove-OOM-tests-from-runtest-mm.patch \
            file://0001-Add-__clear_cache-declaration-for-clang.patch \
+           file://0001-kernel-kvm-don-t-hardcode-objcopy.patch \
            "
 
 S = "${WORKDIR}/git"