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Bug in 68k hardware interrupt stack code
- Date: Wed, 30 Sep 1998 09:44:19 -0500 (CDT)
- From: joel at oarcorp.com (joel at oarcorp.com)
- Subject: Bug in 68k hardware interrupt stack code
Merged. Plus Ralf's suggestion not to define CONFIG.$(TARGET_ARCH).CC.
On Tue, 29 Sep 1998, Eric Norum wrote:
> I found that my 68040/68360 test programs would not run even after I
> fixed the `wrong BSP' problem.
> It seems that there's a bug in the interrupt handling code for
> processors with hardware interrupt stacks (e.g. 68040). The wrong
> status register was getting pushed on the stack for the `return from
> exception' to call _ISR__Dispatch. This ended up making the context
> switch code run on the interrupt stack, so interrupt-driven context
> switches would always fail.
> I guess that no one has tried running any of the RTEMS-4.0 snapshots
> on a 68040 machine!
> Anyhow, here are the patches for
> 1) gen68360.cfg --- to fix the `wrong-BSP' problem.
> 2) m68k/cpu_asm.s --- to fix the hardware interrupt stack problem.
> With these patches in place, the network demo programs run on my
> 68040/68360 system. The paranoia program runs with no failures,
> defects nor flaws.
> [An attachment was originally included here]
> Eric Norum eric at skatter.usask.ca
> Saskatchewan Accelerator Laboratory Phone: (306) 966-6308
> University of Saskatchewan FAX: (306) 966-6058
> Saskatoon, Canada.