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target-alpha: Raise EXC_M_INV properly for fp inputs

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Ignore DNZ if software completion isn't used.  Raise INV for
denormals in system mode so the OS completion handler sees them.

Reported-by: Al Viro <viro@ZenIV.linux.org.uk>
Signed-off-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
Richard Henderson 2014-07-08 10:11:06 -07:00
parent ed0851380c
commit b99e80694c
3 changed files with 30 additions and 10 deletions
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7
target-alpha/translate.c
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@ -658,6 +658,13 @@ static TCGv gen_ieee_input(DisasContext *ctx, int reg, int fn11, int is_cmp)
} else {
gen_helper_ieee_input(cpu_env, val);
}
} else {
#ifndef CONFIG_USER_ONLY
/* In system mode, raise exceptions for denormals like real
hardware. In user mode, proceed as if the OS completion
handler is handling the denormal as per spec. */
gen_helper_ieee_input_s(cpu_env, val);
#endif
}
}
return val;