2022-12-17 05:09:01

by David Gow

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 <[email protected]>
---
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

2023-01-15 11:04:03

by Thomas Meyer

Subject: Re: [PATCH 1/3] rust: arch/um: Use 'pie' relocation mode under UML

Hi,


Am 17. Dezember 2022 05:44:34 MEZ schrieb David Gow <[email protected]>:
>UML expects a position independent executable for some reason,

I think I did add this to make UML build on Debian...

> 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 <[email protected]>
>---
> 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))) \

--
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