right, when I build for stellaris or stm32f103re I get the cortex-m like vector table that uses arm 32 bit instruction startup code that branches to a pascalmain that is thumb2. something that wont execute on hardware. Had it been a thumb target with a traditional exeception table that would have been good and in fact desirable for some platforms (nintendo gba for example). but the arm/thumb2 combination doesnt mix very well.
Maybe I need to re-try everything from scratch to see if I skipped a step or left out something and specified the wrong target or cpu.
Note you are giving up a stack location by using addresses in the form 0x10007FFC instead of 0x10008000. Minor point but it stands out in the binary.
This is all clearly a work in progress, I understand that... David On 08/20/2011 11:49 AM, John Clymer wrote:
The thumb2 is meant to support Cortex M3 devices (STM32, Stellaris, etc.) AFAIK - the mixing of modes is not currently an option. ------------------------------------------------------------------------ *From:* Jeppe Græsdal Johansen <jjoha...@student.aau.dk> *To:* FPC developers' list <fpc-devel@lists.freepascal.org> *Sent:* Sat, August 20, 2011 7:23:39 PM *Subject:* Re: [fpc-devel] Arm Thumb2 - Stellaris status Den 20-08-2011 16:46, David Welch skrev: > I was hoping for thumb support but I now see that the choices are limited to arm and thumb+thumb2 (without any separation between thumb and thumb2). Actually thumb2 wasnt working for me, I got an arm+thumb2 mix, so I will ride this along for a while and see what comes up, otherwise limit my use to ARM targets, or start working on a thumb backend. Adding backends as well as arm embedded are of interest to me so I may work on a little of both. Why thumb support? The choices are indeed currently only either ARM or Thumb2(which is Thumb+32 bit extensions). Thumb2 is a variable length instruction set that looks like an arm+thumb mix, so I guarantee you that it works :) _______________________________________________ fpc-devel maillist - fpc-devel@lists.freepascal.org <mailto:fpc-devel@lists.freepascal.org> http://lists.freepascal.org/mailman/listinfo/fpc-devel _______________________________________________ fpc-devel maillist - fpc-devel@lists.freepascal.org http://lists.freepascal.org/mailman/listinfo/fpc-devel
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