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

[Julien Grall <julien.grall@xxxxxxx>]

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>

---
    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 */
 
-- 
2.11.0


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