Re: RE: RE: [ECOS] ecos-3.0 current stm32 bug?

["Philipp Meier" <pme.neratec@gmx.ch>]

Hello Christophe

it is the SWI instruction ("svc 0" in disassem code) that triggers the exception (therefore breakpoint in hal_switch_state_vsr is never reached).

Where does the SWI instruction get's it's information about where to jump to? Is it the hal_vsr_table (located at 0x20000000)? In entry 11 I have 0x8040025 which is the address for hal_switch_state_vsr - and yet it does not jumps to 0x8040025 but instead to 0x8040042 (hal_default_exception_vsr).

Any idea about the reason for this behaviour?

Cheers Philipp

-------- Original-Nachricht --------
> Datum: Wed, 24 Aug 2011 09:40:02 -0700
> Von: "Christophe Coutand" <ccoutand@stmi.com>
> An: "Philipp Meier" <pme.neratec@gmx.ch>, ecos-discuss@ecos.sourceware.org
> Betreff: RE: RE: [ECOS] ecos-3.0 current stm32 bug?

> What about setting a breakpoint in hal_switch_state_vsr? Is it the SWI
> instruction that triggers the exception or is it the execution of the
> hal_switch_state_vsr routine?
> 
> Christophe
> 
> > -----Original Message-----
> > From: ecos-discuss-owner@ecos.sourceware.org [mailto:ecos-discuss-
> > owner@ecos.sourceware.org] On Behalf Of Philipp Meier
> > Sent: 24. august 2011 16:58
> > To: ecos-discuss@ecos.sourceware.org
> > Subject: Re: RE: [ECOS] ecos-3.0 current stm32 bug?
> > 
> > Hello Christophe,
> > 
> > Yes - both are ROM startup type. The bootloader without offset (i.e.
> > offset 0x0), the application with offset 0x40000.
> > 
> > In the bootloader elf file hal_vsr_table is 20000000 and the same is
> > true for the application.
> > 
> > GDB debug output when debugging the startup of the application:
> > 
> > Bad case (Linux built bootloader):
> > ----------------------------------
> > (gdb) print /fx hal_vsr_table
> > $1 = {0x441c4c08, 0x61232301, 0x8040043, 0x8040043, 0x8040043,
> > 0x8040043, 0x8040043, 0x8040043, 0x8040043, 0x8040043,
> >   0x8040043, 0x8040025, 0x8040043, 0x8040043, 0x8040089, 0x8040075
> > <repeats 61 times>}
> > (gdb) print /fx &hal_vsr_table
> > $2 = 0x20000000
> > 
> > Good case (Cygwin built bootloader):
> > ----------------------------------
> > (gdb) print /fx hal_vsr_table
> > $1 = {0x4024f8df, 0xf04f4d09, 0x8040043, 0x8040043, 0x8040043,
> > 0x8040043, 0x8040043, 0x8040043, 0x8040043, 0x8040043,
> >   0x8040043, 0x8040025, 0x8040043, 0x8040043, 0x8040089, 0x8040075
> > <repeats 61 times>}
> > (gdb) print /fx &hal_vsr_table
> > $2 = 0x20000000
> > 
> > Cheers
> > Philipp
> > 
> > -------- Original-Nachricht --------
> > > Datum: Wed, 24 Aug 2011 07:22:53 -0700
> > > Von: "Christophe Coutand" <ccoutand@stmi.com>
> > > An: "Philipp Meier" <pme.neratec@gmx.ch>, "ecos discuss" <ecos-
> > discuss@ecos.sourceware.org>
> > > Betreff: RE: [ECOS] ecos-3.0 current stm32 bug?
> > 
> > > Both the bootloader and the application are ROM startup type?
> > >
> > > What about the address of the hal_vsr_table in the bootloader and
> > > application?
> > >
> > > Christophe
> > >
> > > > -----Original Message-----
> > > > From: ecos-discuss-owner@ecos.sourceware.org [mailto:ecos-discuss-
> > > > owner@ecos.sourceware.org] On Behalf Of Philipp Meier
> > > > Sent: 24. august 2011 16:11
> > > > To: ecos discuss
> > > > Subject: Re: [ECOS] ecos-3.0 current stm32 bug?
> > > >
> > > > -------- Original-Nachricht --------
> > > > > Datum: Wed, 24 Aug 2011 14:35:15 +0300 (EEST)
> > > > > Von: Sergei Gavrikov <sergei.gavrikov@gmail.com>
> > > > > An: Philipp Meier <pme.neratec@gmx.ch>
> > > > > CC: ecos-discuss@ecos.sourceware.org
> > > > > Betreff: Re: [ECOS] ecos-3.0 current stm32 bug?
> > > >
> > > > > On Wed, 24 Aug 2011, Philipp Meier wrote:
> > > > >
> > > > > > Hi all
> > > > > >
> > > > > > I have a firmware split into two parts:
> > > > > >  1. a "bootloader"
> > > > > >  2. a "application"
> > > > > >
> > > > > > I now need to move from Windows (cygwin) development
> > environment to
> > > > > > Linux development environment and at the same time use the
> > current
> > > > > > ecos version (i.e. what I get when I clone the ecos mercurial
> > > > > > repository) instead of the "original" (back in 2009) ecos-3.0
> > > > version.
> > > > > >
> > > > > > The situation is now as follows:
> > > > > >  1. I download (to my stm32 device) the Linux/ecos-current
> > built
> > > > > >  "bootloader"
> > > > > >  2. I download (to my stm32 device) the Linux/ecos-current
> > built
> > > > > >  "application"
> > > > > >  3. I start the application and in line 187 of file
> > > > > >  'hal/cortexm/arch/current/src/hal_msic.c' instead of branching
> > to
> > > > > >  'hal_switch_state_vsr' it branches to
> > 'hal_default_exception_vsr'
> > > > > >  function!
> > > > > >
> > > > > > To analyze the problem I then:
> > > > > >  4. Downloaded (to my stm32 device) the cyginw/ecos-3.0 built
> > > > > >  "bootloader"
> > > > > >  5. Still having the Linux/ecos-current built "application"
> > > > > >  6. And in line 187 (of the above mentioned file) it branches
> > (as
> > > > it
> > > > > >  should) to 'hal_switch_state_vsr' and the application is
> > starting
> > > > up
> > > > > >  and running fine!
> > > > > >
> > > > > > Who can give me a hint about
> > > > > >  * what has been changed in ecos-current cortexm stm32 that
> > could
> > > > > >  cause this problem
> > > > >
> > > > > Hi Philipp,
> > > > >
> > > > > I think you can use Mercurial for that
> > > > >
> > > > > % hg tags | grep v3
> > > > > ecos-v3_0-branchpoint           2821:b5a12bb6a634
> > > > >
> > > > > % hg log -r ecos-v3_0-branchpoint:tip packages/hal/cortexm/arch |
> > > > less
> > > > > -FRSX
> > > > >
> > > > > or (may be)
> > > > >
> > > > > % hg log --patch -r ecos-v3_0-branchpoint:tip \
> > > > > 	packages/hal/cortexm/arch/current/src/hal_misc.c | less -
> > FRSX
> > > > >
> > > > > etc.
> > > > >
> > > > > >  * or what else I could analyze to find out why ecos-current
> > (built
> > > > on
> > > > > >  Linux, arm-eabi-gcc (eCosCentric GNU tools 4.3.2-sw); under
> > cygwin
> > > > I
> > > > > >  also used the arm-eabi-gcc version 4.3.2 pre-built by
> > eCosCentric)
> > > > >
> > > > > Also you would check the Linux build for ecos-3.0 codebase
> > > > >
> > > > > # get old (working) code
> > > > > % hg update ecos-v3_0-branchpoint
> > > > >
> > > > > Rebuild your loader and application under Linux and try it (use
> > fresh
> > > > > directories for builds). After all do not forget up-to-date eCos
> > HG
> > > > > repository (hg update default).
> > > > >
> > > > > Feel free to submit a bug report (if you'll find something) via
> > eCos
> > > > > Bugzilla System http://bugs.ecos.sourceware.org/
> > > > >
> > > > >
> > > > > Sergei
> > > > >
> > > > > > Regards
> > > > > > Philipp
> > > >
> > > > Hello Sergei and others
> > > >
> > > > Thanks a lot for your tips about how to find out the differences
> > > > between the versions.
> > > >
> > > > I now went a step back and built (under Linux) my "bootloader" and
> > my
> > > > "application" under Linux using the same ecos sources and
> > configuration
> > > > files as when I built them under Windows/cygwin.
> > > >
> > > > Therefore - I wanted to see if the problem comes from building
> > under
> > > > Linux, or from changes in the ecos stm32 parts (or any other ecos
> > > > parts).
> > > >
> > > > But - I have the same problem as described above; i.e. the problem
> > must
> > > > be somehow in my Linux toolchain?
> > > >
> > > > Therefore my question now is:
> > > > Can anybody give me some background information about how the
> > "__asm__
> > > > volatile( "swi" )" statement in line 188 of
> > > > packages/hal/cortexm/arch/v3_0/src/hal_misc.c (or "swi 0" line 187
> > in
> > > > packages/hal/cortexm/arch/current/src/hal_misc.c when using ecos-
> > > > current) is interpreted on stm32? What could be the reason that it
> > does
> > > > not jumps to "hal_switch_state_vsr" but instead jumps to
> > > > "hal_default_exception_vsr"?
> > > >
> > > > The lines where the different behaviour is look like this:
> > > > hal_vsr_table[CYGNUM_HAL_VECTOR_SERVICE] =
> > > > (CYG_ADDRESS)hal_switch_state_vsr;
> > > >
> > > > __asm__ volatile( "swi" );
> > > >
> > > > ...
> > > >
> > > > In the good case these leads to a jump/branch to
> > hal_switch_state_vsr
> > > > and in the bad case it jumps/branches to hal_default_exception_vsr
> > and
> > > > therefore my application does not starts up.
> > > >
> > > > Thanks for any help.
> > > >
> > > > Philipp
> > > > --
> > > > P.S.: Sorry Sergei - I did not mean to reply directly to you but
> > like
> > > > this to the mailing list.
> > > > --
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> 

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