ARM exception vector question
gds at chartertn.net
Mon Aug 4 22:13:58 UTC 2008
For my type of arm (ARM946ES) there needs to be exception jump structure
at the bottom of memory (address 0) to handle the exceptions (data
aborts, irq, etc). Looking through the ARM specific rtems code I can't
seem to find anything that defines this type of thing (see below, where
workingEntry is located at 0). This is from a linux bsp that uses the 946es.
Do the current ARM bsp's in rtems not need this type of structure? Or
possibly it's assumed to be setup by a bootloader? Or am I just not
seeing something like this in rtems code?
I also looked at the contributed NDS project which uses ARM946ES and
can't find this.
The items at resetJump: and below I do see how they are initialized in
function _CPU_ISR_install_vector in score/cpukit/score/cpu/arm/cpu.c.
ldr r15, resetJump
ldr r15, undefinedInstructJump
ldr r15, softwareInterrupt
ldr r15, prefetchAbort
ldr r15, dataAbort
ldr r15, unknownVector
ldr r15, normalIntr
ldr r15, fiqIntr
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