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[PATCH] i386: Ignore masked FPU exceptions

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Masked FPU exceptions should obviously not happen in the first place,
but if they do, ignoring them seems to be the right thing to do.

Although there is no documentation available for Cyrix MII, I did find
erratum F-7 for Winchip C6, "FPU instruction may result in spurious
exception under certain conditions" which seems to indicate that this
can happen.

That would also explain the behaviour Ondrej Zary reported on the MII.

Signed-off-by: Chuck Ebbert <76306.1226@compuserve.com>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Chuck Ebbert 2005-09-13 04:55:41 -04:00 committed by Linus Torvalds
parent ddbf9ef385
commit 33333373c4
1 changed files with 3 additions and 2 deletions
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5
arch/i386/kernel/traps.c
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@ -807,8 +807,9 @@ void math_error(void __user *eip)
cwd = get_fpu_cwd(task); cwd = get_fpu_cwd(task);
swd = get_fpu_swd(task); swd = get_fpu_swd(task);
switch (swd & ~cwd & 0x3f) { switch (swd & ~cwd & 0x3f) {
case 0x000: case 0x000: /* No unmasked exception */
default: return;
default: /* Multiple exceptions */
break; break;
case 0x001: /* Invalid Op */ case 0x001: /* Invalid Op */
/* /*