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List: busybox
Subject: Re: [BusyBox] CONFIG_FEATURE_AWK_MATH causes boot to hang
From: olivier.delouya () takimaging ! com
Date: 2005-02-28 13:28:55
Message-ID: OF83016319.7382182D-ONC1256FB6.0049A8AC-C1256FB6.0049B9C4 () takasic ! tak
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Hi,
I confirm that hard maths hang my ARM platform at boot time, because it
does not actually
have floating support..
The fault was not easy to locate; Not making any math operation, the lock
happened on a
simple setjmp/longjump, when the libc attempted to save / restore floating
point registers..
Fix: on my own, use soft math exclusively..
Good luck
Olivier Delouya
Felix Domke <tmbinc@elitedvb.net>
Sent by: busybox-bounces@mail.codepoet.org
25/02/2005 18:30
To
busybox@mail.codepoet.org
cc
Subject
Re: [BusyBox] CONFIG_FEATURE_AWK_MATH causes boot to hang
Hi,
>>> Has anyone else seen this problem and know the cause/fix.
> I _think_ that got fixed on later glibc's. Also the problem only occurs
> with CONFIG_FEATURE_AWK_MATH, if I turn that option off it works just
fine.
Looks like you're building with hardfloat and without kernel fpu
emulation.
This will hang the boot process for some reason (I don't know why there
aren't any errors).
However i've seen this behaviour, and enabling the fpu emulation fixed
it. Softfloat might be a better alternative, but sometimes you need
binary compatibility which you'll (almost) get with the fpu emulation.
Felix
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<br><font size=2 face="sans-serif">Hi,</font>
<br>
<br><font size=2 face="sans-serif">I confirm that hard maths hang my ARM
platform at boot time, because it does not actually</font>
<br><font size=2 face="sans-serif">have floating support..</font>
<br><font size=2 face="sans-serif">The fault was not easy to locate; Not
making any math operation, the lock happened on a </font>
<br><font size=2 face="sans-serif">simple setjmp/longjump, when the libc
attempted to save / restore floating point registers..</font>
<br><font size=2 face="sans-serif">Fix: on my own, use soft math exclusively..</font>
<br>
<br><font size=2 face="sans-serif">Good luck</font>
<br>
<br><font size=2 face="sans-serif">Olivier Delouya</font>
<br>
<br>
<br>
<table width=100%>
<tr valign=top>
<td width=40%><font size=1 face="sans-serif"><b>Felix Domke <tmbinc@elitedvb.net></b>
</font>
<br><font size=1 face="sans-serif">Sent by: busybox-bounces@mail.codepoet.org</font>
<p><font size=1 face="sans-serif">25/02/2005 18:30</font>
<td width=59%>
<table width=100%>
<tr valign=top>
<td>
<div align=right><font size=1 face="sans-serif">To</font></div>
<td><font size=1 face="sans-serif">busybox@mail.codepoet.org</font>
<tr valign=top>
<td>
<div align=right><font size=1 face="sans-serif">cc</font></div>
<td>
<tr valign=top>
<td>
<div align=right><font size=1 face="sans-serif">Subject</font></div>
<td><font size=1 face="sans-serif">Re: [BusyBox] CONFIG_FEATURE_AWK_MATH
causes boot to hang</font></table>
<br>
<table>
<tr valign=top>
<td>
<td></table>
<br></table>
<br>
<br>
<br><font size=2><tt>Hi,<br>
<br>
>>> Has anyone else seen this problem and know the cause/fix.<br>
> I _think_ that got fixed on later glibc's. Also the problem
only occurs<br>
> with CONFIG_FEATURE_AWK_MATH, if I turn that option off it works just
fine.<br>
Looks like you're building with hardfloat and without kernel fpu emulation.<br>
<br>
This will hang the boot process for some reason (I don't know why there<br>
aren't any errors).<br>
<br>
However i've seen this behaviour, and enabling the fpu emulation fixed<br>
it. Softfloat might be a better alternative, but sometimes you need<br>
binary compatibility which you'll (almost) get with the fpu emulation.<br>
<br>
Felix<br>
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busybox mailing list<br>
busybox@mail.busybox.net<br>
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<br>
</tt></font>
<br>
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