code compatibility

suresh wrote:
> I have ported an application c code to arm.The code contains file read &
> write functions.But when iam running in simulator(arm realview debugger)
> the assembly code is not reading the file from host system.I want to
> know whether this is any compatibility problem with gnu and arm realview
> debugger.

I do not know the RealView toolchain well too (just played with the
RealView-compiler which comes with the Keil uVision eval) so take it for
what it's worth: Searching the RealView-documentation for "semihosting"
should give further information. The gdb-Simulator catches SWI-calls to
provide read/write from/to files on the host-system. Maybe the
RealView-simulator uses a similar approach, if yes: please verify that
the low-level functions ("syscalls") use SWI-calls.

"Repeated suggestion": Since you are using a commercial toolchain the
best place to ask such questions is the tool-vendors's support. There
are support-people who know how their simulator works internaly.

Martin Thomas

Clifford Slocombe wrote:
> suresh wrote:
>> ...iam running in simulator(arm realview debugger)
>
> Commercial development tools are normally supported by the tool vendor -
> perhaps you might try that route. After all, you probably paid for
> support when you bought the tool.
>
> I took a quick look at http://www.keil.com/support/ and can find no
> evidence that a host file system (or semi-hosting) is supported.
>
> Clifford

Hi all,
I cannot get support from arm ,since i have used the gnu tool chain for
cross compilation.Can any one could tell me the c FILE structure
definition and the structure elements.Iam planning to force the file
pointer to a memory location through load option in debugger, instead of
from the hard disk.Is there any problem inthat or will it work
Thanks in advance
suresh

suresh wrote:
> Clifford Slocombe wrote:
>> suresh wrote:
>>> ...iam running in simulator(arm realview debugger)
>>
>> Commercial development tools are normally supported by the tool vendor -
>> perhaps you might try that route. After all, you probably paid for
>> support when you bought the tool.
>>
>> I took a quick look at http://www.keil.com/support/ and can find no
>> evidence that a host file system (or semi-hosting) is supported.
>>
>> Clifford
>
> Hi all,
> I cannot get support from arm ,since i have used the gnu tool chain for
> cross compilation.Can any one could tell me the c FILE structure
> definition and the structure elements.Iam planning to force the file
> pointer to a memory location through load option in debugger, instead of
> from the hard disk.Is there any problem inthat or will it work
> Thanks in advance
> suresh

Keil uses it's own simulator as far as I know. I think the
RealView-simulator is a completly different product (although Keil is
now owned by ARM). Semihosting is documented in the ARM manuals (just
did a quick browse: Compiler&Libary-Manual and ARM Armulator-Manual).
The Simulator uses SWI-calls for the low-level IO-functions which are
processed by the simulator. So you just have to implement the syscalls
with SWIs. Basicly the same as in the gdb-simulator (also called
Armulator). See the newlib-code the code for the syscalls already
include SWI-handling ("AngelSWI") so there is no need to reinvent "all"
wheels.