linux-kernel - [PATCH 1/3] rust: arch/um: Use 'pie' relocation mode under UML

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Message-ID: <20221217044436.4138642-2-davidgow@google.com>
Date:   Sat, 17 Dec 2022 12:44:34 +0800
From:   David Gow <davidgow@...gle.com>
To:     Miguel Ojeda <ojeda@...nel.org>,
        "Björn Roy Baron" <bjorn3_gh@...tonmail.com>,
        Richard Weinberger <richard@....at>,
        Anton Ivanov <anton.ivanov@...bridgegreys.com>,
        Johannes Berg <johannes@...solutions.net>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     David Gow <davidgow@...gle.com>, rust-for-linux@...r.kernel.org,
        linux-um@...ts.infradead.org, llvm@...ts.linux.dev,
        linux-doc@...r.kernel.org, kunit-dev@...glegroups.com,
        x86@...nel.org, linux-kernel@...r.kernel.org,
        Wedson Almeida Filho <wedsonaf@...il.com>,
        Gary Guo <gary@...yguo.net>,
        Brendan Higgins <brendan.higgins@...ux.dev>,
        Daniel Latypov <dlatypov@...gle.com>,
        Jonathan Corbet <corbet@....net>
Subject: [PATCH 1/3] rust: arch/um: Use 'pie' relocation mode under UML

UML expects a position independent executable for some reason, so tell
rustc to generate pie objects. Otherwise we get a bunch of relocations
we can't deal with in libcore.

Signed-off-by: David Gow <davidgow@...gle.com>
---
 arch/um/Makefile | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/um/Makefile b/arch/um/Makefile
index f1d4d67157be..ae321282dc6f 100644
--- a/arch/um/Makefile
+++ b/arch/um/Makefile
@@ -68,6 +68,8 @@ KBUILD_CFLAGS += $(CFLAGS) $(CFLAGS-y) -D__arch_um__ \
 	-Din6addr_loopback=kernel_in6addr_loopback \
 	-Din6addr_any=kernel_in6addr_any -Dstrrchr=kernel_strrchr
 
+KBUILD_RUSTFLAGS += -Crelocation-model=pie
+
 KBUILD_AFLAGS += $(ARCH_INCLUDE)
 
 USER_CFLAGS = $(patsubst $(KERNEL_DEFINES),,$(patsubst -I%,,$(KBUILD_CFLAGS))) \
-- 
2.39.0.314.g84b9a713c41-goog