[Xen-devel] [PATCH v2 2/4] arm64: use "b" to branch to start_xen

[Wei Liu <wei.liu2@xxxxxxxxxx>]

The cbz instruction has range limitation. When compiled with gcov
support the object is larger so cbz can't handle that anymore. The error
message is like:

aarch64-linux-gnu-ld    -EL  -T xen.lds -N prelink.o \
    /local/work/xen.git/xen/common/symbols-dummy.o -o 
/local/work/xen.git/xen/.xen-syms.0
prelink.o: In function `launch':
/local/work/xen.git/xen/arch/arm/arm64/head.S:602:(.text+0x408): relocation 
truncated to fit: R_AARCH64_CONDBR19 against symbol `start_xen' defined in 
.init.text section in prelink.o

Use "b" instead.

Signed-off-by: Wei Liu <wei.liu2@xxxxxxxxxx>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Reviewed-by: Julien Grall <julien.grall@xxxxxxx>
---
 xen/arch/arm/arm64/head.S | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/xen/arch/arm/arm64/head.S b/xen/arch/arm/arm64/head.S
index 91e2817..3f63d2a 100644
--- a/xen/arch/arm/arm64/head.S
+++ b/xen/arch/arm/arm64/head.S
@@ -599,7 +599,9 @@ launch:
         mov   x0, x20                /* Marshal args: - phys_offset */
         mov   x1, x21                /*               - FDT */
         mov   x2, x24                /*               - CPU ID */
-        cbz   x22, start_xen         /* and disappear into the land of C */
+        cbnz  x22, 1f
+        b     start_xen              /* and disappear into the land of C */
+1:
         b     start_secondary        /* (to the appropriate entry point) */
 
 /* Fail-stop */
-- 
2.1.4


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