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authorPaul Mundt <lethal@linux-sh.org>2009-08-20 14:02:20 +0900
committerPaul Mundt <lethal@linux-sh.org>2009-08-20 14:02:20 +0900
commit485f0720c3e0f57deac403acfbf078a89baeb6ba (patch)
tree763e04f149fb17683f3f1353ec517c11c53bc8c2 /arch
parent6503fe4a6508673c15a509ec4ac3ca5979ae9593 (diff)
sh: DSP save/restore ordering and a0 sign extension fixups.
As an excellent indicator of how much testing the DSP code gets, a couple of rather glaring bugs in the DSP save/restore paths were found: - In the DSP restore case a0 needs to be popped off before a0g, or the value of a0g is clobbered by the MSB of a0 in the case of sign extension. - Beyond that, the save and restore orders were out of sync, so this fixes that up as well. At the same time, we switch over to using movs.l for both the save and restore of the general DSP registers as opposed to using sts.l (which was initially put in place to work around a bug in ancient binutils versions which the kernel no longer supports). Reported-by: Chee Soon Yip <yip.cheesoon@renesas.com> Cc: Chu Lih Kwek <kwek.chulih@renesas.com>, Cc: General Lai <general.lai@renesas.com>, Cc: Robert Cozens <Robert.Cozens@renesas.com> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Diffstat (limited to 'arch')
-rw-r--r--arch/sh/include/asm/system_32.h26
1 files changed, 13 insertions, 13 deletions
diff --git a/arch/sh/include/asm/system_32.h b/arch/sh/include/asm/system_32.h
index 6c68a51f1cc..81e0d668eef 100644
--- a/arch/sh/include/asm/system_32.h
+++ b/arch/sh/include/asm/system_32.h
@@ -14,12 +14,12 @@ do { \
(u32 *)&tsk->thread.dsp_status; \
__asm__ __volatile__ ( \
".balign 4\n\t" \
+ "movs.l @r2+, a0\n\t" \
"movs.l @r2+, a1\n\t" \
"movs.l @r2+, a0g\n\t" \
"movs.l @r2+, a1g\n\t" \
"movs.l @r2+, m0\n\t" \
"movs.l @r2+, m1\n\t" \
- "movs.l @r2+, a0\n\t" \
"movs.l @r2+, x0\n\t" \
"movs.l @r2+, x1\n\t" \
"movs.l @r2+, y0\n\t" \
@@ -39,20 +39,20 @@ do { \
\
__asm__ __volatile__ ( \
".balign 4\n\t" \
- "stc.l mod, @-r2\n\t" \
+ "stc.l mod, @-r2\n\t" \
"stc.l re, @-r2\n\t" \
"stc.l rs, @-r2\n\t" \
- "sts.l dsr, @-r2\n\t" \
- "sts.l y1, @-r2\n\t" \
- "sts.l y0, @-r2\n\t" \
- "sts.l x1, @-r2\n\t" \
- "sts.l x0, @-r2\n\t" \
- "sts.l a0, @-r2\n\t" \
- ".word 0xf653 ! movs.l a1, @-r2\n\t" \
- ".word 0xf6f3 ! movs.l a0g, @-r2\n\t" \
- ".word 0xf6d3 ! movs.l a1g, @-r2\n\t" \
- ".word 0xf6c3 ! movs.l m0, @-r2\n\t" \
- ".word 0xf6e3 ! movs.l m1, @-r2\n\t" \
+ "sts.l dsr, @-r2\n\t" \
+ "movs.l y1, @-r2\n\t" \
+ "movs.l y0, @-r2\n\t" \
+ "movs.l x1, @-r2\n\t" \
+ "movs.l x0, @-r2\n\t" \
+ "movs.l m1, @-r2\n\t" \
+ "movs.l m0, @-r2\n\t" \
+ "movs.l a1g, @-r2\n\t" \
+ "movs.l a0g, @-r2\n\t" \
+ "movs.l a1, @-r2\n\t" \
+ "movs.l a0, @-r2\n\t" \
: : "r" (__ts2)); \
} while (0)