[Xen-changelog] [xen master] xen/arm64: do not clobber callee saved register in early_putch

[patchbot@xxxxxxx]

commit 2629838162255cc1207a80f8976fbd4e51763a76
Author:     Ian Campbell <ian.campbell@xxxxxxxxxx>
AuthorDate: Mon May 13 17:23:00 2013 +0100
Commit:     Ian Campbell <ian.campbell@xxxxxxxxxx>
CommitDate: Tue May 14 10:04:14 2013 +0100

    xen/arm64: do not clobber callee saved register in early_putch
    
    x23 is callee saved in the ARM 64 bit calling convention. Use x15 instead
    which is a temporary register which need not be preserved.
    
    Fixes a random crash during boot.
    
    Signed-off-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
    Acked-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
---
 xen/arch/arm/arm64/debug.S |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/xen/arch/arm/arm64/debug.S b/xen/arch/arm/arm64/debug.S
index f0c7761..38b7c74 100644
--- a/xen/arch/arm/arm64/debug.S
+++ b/xen/arch/arm/arm64/debug.S
@@ -27,9 +27,9 @@
 /* Print a character on the UART - this function is called by C
  * x0: character to print */
 early_putch:
-        ldr   x23, =FIXMAP_ADDR(FIXMAP_CONSOLE)
-        early_uart_ready x23, 1
-        early_uart_transmit x23, w0
+        ldr   x15, =FIXMAP_ADDR(FIXMAP_CONSOLE)
+        early_uart_ready x15, 1
+        early_uart_transmit x15, w0
         ret
 
 /*
--
generated by git-patchbot for /home/xen/git/xen.git#master

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