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authorCatalin Marinas <catalin.marinas@arm.com>2010-02-01 18:50:40 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2010-02-01 20:05:09 +0000
commitdbead405801c8d5aa1bc21ab6e2a47f060d47c06 (patch)
treeeac1f57dd0baa9e2b262bae0c0d310ea66cae461 /arch
parentc540b9ff0f8679ba924fac072aeb7d63fa473190 (diff)
downloadlinux-linaro-stable-dbead405801c8d5aa1bc21ab6e2a47f060d47c06.tar.gz
ARM: 5909/1: ARM: Correct the FPSCR bits setting when raising exceptions
Commit c98929c07a removed the clearing of the FPSCR[31:28] bits from the vfp_raise_exceptions() function and the new bits are or'ed with the old FPSCR bits leading to unexpected results (the original commit was referring to the cumulative bits - FPSCR[4:0]). Reported-by: Tom Hameenanttila <tmhameen@marvell.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch')
-rw-r--r--arch/arm/vfp/vfpmodule.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/arch/arm/vfp/vfpmodule.c b/arch/arm/vfp/vfpmodule.c
index f60a5400a25b..a63c4be99b36 100644
--- a/arch/arm/vfp/vfpmodule.c
+++ b/arch/arm/vfp/vfpmodule.c
@@ -197,10 +197,13 @@ static void vfp_raise_exceptions(u32 exceptions, u32 inst, u32 fpscr, struct pt_
}
/*
- * Update the FPSCR with the additional exception flags.
+ * If any of the status flags are set, update the FPSCR.
* Comparison instructions always return at least one of
* these flags set.
*/
+ if (exceptions & (FPSCR_N|FPSCR_Z|FPSCR_C|FPSCR_V))
+ fpscr &= ~(FPSCR_N|FPSCR_Z|FPSCR_C|FPSCR_V);
+
fpscr |= exceptions;
fmxr(FPSCR, fpscr);