MIPS: fix a latent bug on initialize $gp
If bal is 8 bytes aligned, the _gp will not be 8 bytes aligned.
then the following ld insntrustion generates a Adel exception.
So here make _gp be always aligned in 8 bytes.
Signed-off-by: Zhi-zhou Zhang <zhizhou.zh@gmail.com>
Signed-off-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
diff --git a/arch/mips/cpu/mips64/start.S b/arch/mips/cpu/mips64/start.S
index 4112de7..2b8d531 100644
--- a/arch/mips/cpu/mips64/start.S
+++ b/arch/mips/cpu/mips64/start.S
@@ -108,7 +108,12 @@
mtc0 t0, CP0_CONFIG
#endif
- /* Initialize $gp */
+ /*
+ * Initialize $gp, force 8 byte alignment of bal instruction to forbid
+ * the compiler to put nop's between bal and _gp. This is required to
+ * keep _gp and ra aligned to 8 byte.
+ */
+ .align 3
bal 1f
nop
.dword _gp