Re: arm-elf-gcc building erroneous code for ISR (long posting)

From: Andras Tantos (andras_tantos_at_yahoo.com)
Date: 06/14/04 

Date: Mon, 14 Jun 2004 14:03:51 -0700

You can download a newer (actually two: 3.3.1 and 3.4.0) GCC from my
webpage. I know they've fixed a serious ARM bugs in their IRQ handling
around 3.3.0. You might be hitting it. 

--
Regards,
Andras Tantos
<http://andrast.tantos.homedns.org>
"Jens Hildebrandt" <jens.hildebrandt@remove_this.etechnik.uni-rostock.de>
wrote in message news:40cd60da@news.uni-rostock.de...
> Hello group,
>
> I'm curently trying to get familiar with the ARM7 by building some
> example-projects for a LPC2106-controller. One such project is the
blinky_irq
> example from Keil which should demonstrate the use of interrupts and of
the
> LPC2xxx vectored interrupt controller. I'm using gcc-3.2.1 with binutils
3.13.1
> and newlib 1.11.0 . So far I had no problems with these tools and I was
able to
> build and succesfully run some small demonstrator programs (without
interrupts)
> on my LPC2106 board. For the blinky_irq example program I use the linker
script
> and startup.s files (with adjustment for the Flash and RAM sizes of the
LPC2106)
> that came with the source code from Keil's download area. Since the
program
> didn't work I stripped it from all unnecessary functionality (main() is
> essentially an empty loop now) and simply let the timer ISR toggle a LED
on
> GPIO24. That worked initially, but after some time (~ 3 minutes) the LED
stopped
> toggling. I suspected that somwhere I'm loosing memory such that after
some time
> I'm out of RAM. Hence, I took a look at the disassembled code and saw that
the
> ISR is messing up the IRQ-mode stack pointer, loosing seven words each
time the
> ISR is invoked.
> Since the ISR entry and exit codes are automatically generated by the
compiler I
> suspect a bug in gcc. On the other hand, since this would be a very severe
> failure other users should have come across it, too. Does anybody of you
know
> that error (i.e. should I change to another gcc version) or am I missing
> something (e.g. gcc options)?
> Below you'll find the build commands used, the sources of the program and
the
> disassembled ISR code.
>
> TIA,
> Jens
>

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