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Re: [Xen-devel] [PATCH v2 01/35] xen/arm64: macros: Introduce an assembly macro to alias x30

From: Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>

Date: Fri, 26 Jul 2019 14:28:05 +0000

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Cc: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>

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List-id: Xen developer discussion <xen-devel.lists.xenproject.org>

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Thread-topic: [PATCH v2 01/35] xen/arm64: macros: Introduce an assembly macro to alias x30

Julien Grall writes: > The return address of a function is always stored in x30. For convenience, > introduce a register alias so "lr" can be used in assembly. > > This is defined in asm-arm/arm64/macros.h to allow all assembly files > to use it. > > Signed-off-by: Julien Grall <julien.grall@xxxxxxx> Reviewed-by: Volodymyr Babchuk <volodymyr_babchuk@xxxxxxxx> > > --- > Changes in v2: > - Patch added > --- > xen/arch/arm/arm64/entry.S | 5 ----- > xen/include/asm-arm/arm64/macros.h | 5 +++++ > 2 files changed, 5 insertions(+), 5 deletions(-) > > diff --git a/xen/arch/arm/arm64/entry.S b/xen/arch/arm/arm64/entry.S > index 97b05f53ea..2d9a2713a1 100644 > --- a/xen/arch/arm/arm64/entry.S > +++ b/xen/arch/arm/arm64/entry.S > @@ -7,11 +7,6 @@ > #include <public/xen.h> > > /* > - * Register aliases. > - */ > -lr .req x30 /* link register */ > - > -/* > * Stack pushing/popping (register pairs only). Equivalent to store decrement > * before, load increment after. > */ > diff --git a/xen/include/asm-arm/arm64/macros.h > b/xen/include/asm-arm/arm64/macros.h > index 9c5e676b37..f981b4f43e 100644 > --- a/xen/include/asm-arm/arm64/macros.h > +++ b/xen/include/asm-arm/arm64/macros.h > @@ -21,5 +21,10 @@ > ldr \dst, [\dst, \tmp] > .endm > > +/* > + * Register aliases. > + */ > +lr .req x30 /* link register */ > + > #endif /* __ASM_ARM_ARM64_MACROS_H */ -- Volodymyr Babchuk at EPAM _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxxx https://lists.xenproject.org/mailman/listinfo/xen-devel

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