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authorZhi-zhou Zhang <zhizhou.zh@gmail.com>2012-11-24 05:07:12 +0000
committerDaniel Schwierzeck <daniel.schwierzeck@gmail.com>2012-12-08 21:33:07 +0100
commit0d69d918abff1437c78610dac8b18e8f91917674 (patch)
tree24a6ae635e0cb483a2de93e25bb9729224fcf975
parentfd4d564b3c80b111f18c93adb14233a6a7ddb0e9 (diff)
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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>
-rw-r--r--arch/mips/cpu/mips64/start.S7
1 files changed, 6 insertions, 1 deletions
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 @@ reset:
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