From patchwork Sun Jul 14 08:27:47 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Naveen N Rao X-Patchwork-Id: 13732586 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 00E3A14AB2; Sun, 14 Jul 2024 08:28:58 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1720945739; cv=none; b=FF0gDIFbJl4zwNaIP4IIMWewt9YMITVN60F9Rmh0cS0mFXBTVXTp21wM+rENHlf80k7rG44obRgQ0a2h6cqkP+G5cfJOpeqcbHKb6hb71MrY4XN94AnCmVNy0L0KB1Ep58GF/bdFLX9cMmljlB5TNSrogUgTvDZ6GtScbyH2wbc= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1720945739; c=relaxed/simple; bh=OqYXQllYDdxc5CmUvaNfhz68rWXiRNRgAQYB5EiR7Zw=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=BfVZ2T4wvktvngOXbIVv3rkYmQSJb9eoQcttCmkA7SvIpukeHizI0j6j1jDt9yj62anMtd7W8/pW1geRDsrAr2aRBR0bnnJLHLsArrwgU0lYcPcdR2Gl6jjv4N4HgvYVcNK/NMNqJ+AFGCwgsjAhPGs2DQffl2Z0aLg9ubLQPSU= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=GUE1SjR6; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="GUE1SjR6" Received: by smtp.kernel.org (Postfix) with ESMTPSA id CADE4C116B1; Sun, 14 Jul 2024 08:28:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1720945738; bh=OqYXQllYDdxc5CmUvaNfhz68rWXiRNRgAQYB5EiR7Zw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=GUE1SjR6gGuw/Pmgslop0RoSjIpXNSvrLprVB3VTyh/3fBt1R8dK29bwvalj40aZS HDXWO2ADhm+RrWBPOJfqVLMsAXZVqqGzaiw3x/R3J/lLOL3VgP4tkhvy6kbdFjuoTq wzl+RGl/4ozFzzLB3FBmKAVemWyAm9xRiLUMhyv+ITRuQBqC/Gi0UQ4czuDZtUqcC9 zuL1gGZkMYofie0tY1QsgP5+SCzcVWWC3U+Wf36kQdh1WtsQRi8BtrifOj848mNFFT GFVnuUpREpAGnnpCWhMcE06z7TV1wqGJiir5XxDgzViCXQEO5ywBrM+9s4Pb2/+WYR Sxo0zhhqbK6eQ== From: Naveen N Rao To: , , , linux-kbuild@vger.kernel.org, Cc: Michael Ellerman , Nicholas Piggin , Christophe Leroy , Steven Rostedt , Masami Hiramatsu , Mark Rutland , Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Masahiro Yamada , Hari Bathini , Mahesh Salgaonkar , Vishal Chourasia Subject: [RFC PATCH v4 11/17] kbuild: Add generic hook for architectures to use before the final vmlinux link Date: Sun, 14 Jul 2024 13:57:47 +0530 Message-ID: <87b71debd931011f8b9204c700b3084a6c3cdab8.1720942106.git.naveen@kernel.org> X-Mailer: git-send-email 2.45.2 In-Reply-To: References: Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Patchwork-State: RFC On powerpc, we would like to be able to make a pass on vmlinux.o and generate a new object file to be linked into vmlinux. Add a generic pass in Makefile.vmlinux that architectures can use for this purpose. Architectures need to select CONFIG_ARCH_WANTS_PRE_LINK_VMLINUX and must provide arch//tools/Makefile with .arch.vmlinux.o target, which will be invoked prior to the final vmlinux link step. Signed-off-by: Naveen N Rao --- arch/Kconfig | 6 ++++++ scripts/Makefile.vmlinux | 8 ++++++++ scripts/link-vmlinux.sh | 11 ++++++++--- 3 files changed, 22 insertions(+), 3 deletions(-) diff --git a/arch/Kconfig b/arch/Kconfig index 975dd22a2dbd..ef868ff8156a 100644 --- a/arch/Kconfig +++ b/arch/Kconfig @@ -1643,4 +1643,10 @@ config CC_HAS_SANE_FUNCTION_ALIGNMENT config ARCH_NEED_CMPXCHG_1_EMU bool +config ARCH_WANTS_PRE_LINK_VMLINUX + def_bool n + help + An architecture can select this if it provides arch//tools/Makefile + with .arch.vmlinux.o target to be linked into vmlinux. + endmenu diff --git a/scripts/Makefile.vmlinux b/scripts/Makefile.vmlinux index 49946cb96844..6410e0be7f52 100644 --- a/scripts/Makefile.vmlinux +++ b/scripts/Makefile.vmlinux @@ -22,6 +22,14 @@ targets += .vmlinux.export.o vmlinux: .vmlinux.export.o endif +ifdef CONFIG_ARCH_WANTS_PRE_LINK_VMLINUX +targets += .arch.vmlinux.o +.arch.vmlinux.o: vmlinux.o FORCE + $(Q)$(MAKE) $(build)=arch/$(SRCARCH)/tools .arch.vmlinux.o + +vmlinux: .arch.vmlinux.o +endif + ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink) # Final link of vmlinux with optional arch pass after final link diff --git a/scripts/link-vmlinux.sh b/scripts/link-vmlinux.sh index 518c70b8db50..aafaed1412ea 100755 --- a/scripts/link-vmlinux.sh +++ b/scripts/link-vmlinux.sh @@ -122,7 +122,7 @@ gen_btf() return 1 fi - vmlinux_link ${1} + vmlinux_link ${1} ${arch_vmlinux_o} info "BTF" ${2} LLVM_OBJCOPY="${OBJCOPY}" ${PAHOLE} -J ${PAHOLE_FLAGS} ${1} @@ -178,7 +178,7 @@ kallsyms_step() kallsymso=${kallsyms_vmlinux}.o kallsyms_S=${kallsyms_vmlinux}.S - vmlinux_link ${kallsyms_vmlinux} "${kallsymso_prev}" ${btf_vmlinux_bin_o} + vmlinux_link ${kallsyms_vmlinux} "${kallsymso_prev}" ${btf_vmlinux_bin_o} ${arch_vmlinux_o} mksysmap ${kallsyms_vmlinux} ${kallsyms_vmlinux}.syms kallsyms ${kallsyms_vmlinux}.syms ${kallsyms_S} @@ -223,6 +223,11 @@ fi ${MAKE} -f "${srctree}/scripts/Makefile.build" obj=init init/version-timestamp.o +arch_vmlinux_o="" +if is_enabled CONFIG_ARCH_WANTS_PRE_LINK_VMLINUX; then + arch_vmlinux_o=.arch.vmlinux.o +fi + btf_vmlinux_bin_o="" if is_enabled CONFIG_DEBUG_INFO_BTF; then btf_vmlinux_bin_o=.btf.vmlinux.bin.o @@ -273,7 +278,7 @@ if is_enabled CONFIG_KALLSYMS; then fi fi -vmlinux_link vmlinux "${kallsymso}" ${btf_vmlinux_bin_o} +vmlinux_link vmlinux "${kallsymso}" ${btf_vmlinux_bin_o} ${arch_vmlinux_o} # fill in BTF IDs if is_enabled CONFIG_DEBUG_INFO_BTF && is_enabled CONFIG_BPF; then