From: Arun Sharma <adsharma@unix-os.sc.intel.com>
To: linux-ia64@vger.kernel.org
Subject: IA-32 compatibility patch: FP denormal handling
Date: Wed, 20 Aug 2003 20:39:51 +0000 [thread overview]
Message-ID: <marc-linux-ia64-106141205114677@msgid-missing> (raw)
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The following patch makes ia64 compatible with i386 with respect to siginfo.si_code on FP denormal operands. This is necessary for the correct emulation of many IA-32 apps.
Please apply to both 2.4 and 2.5.
-Arun
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--- linux/arch/ia64/kernel/traps.c.orig Fri Apr 20 19:08:01 2001
+++ linux/arch/ia64/kernel/traps.c Thu Jul 5 13:36:53 2001
@@ -325,6 +325,10 @@
siginfo.si_addr = (void *) (regs->cr_iip + ia64_psr(regs)->ri);
if (isr & 0x11) {
siginfo.si_code = FPE_FLTINV;
+ } else if (isr & 0x22) {
+ /* denormal operand gets the same si_code as underflow
+ * see arch/i386/kernel/traps.c:math_error() */
+ siginfo.si_code = FPE_FLTUND;
} else if (isr & 0x44) {
siginfo.si_code = FPE_FLTDIV;
}
next reply other threads:[~2003-08-20 20:39 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-08-20 20:39 Arun Sharma [this message]
2003-08-21 5:09 ` IA-32 compatibility patch: FP denormal handling David Mosberger
2003-08-26 20:25 ` Bjorn Helgaas
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