Lpc2000

--- In lpc2000@yahoogroups.com, Richard Duits <yahoo@...> wrote:
>
> Make sure the identifier from your error message is exactly the 
same as 
> the identifier after the .global. I used to code x86 assembler in 
masm 
> or tasm and there you had to prefix the identifier with an 
underscore ( 
> _ ). When I started with ARM also did this and it gave the same 
errors 
> you are getting now.

It´s verified, there is absolute coincidence. I´ve pased -
y "Problematic function" to the linker, and it confirms that they are 
declare properly in those assembler object files. I´ve also made 
tests with underscores (_), and it didn´t work.


> 
> Make sure you use extern "C" { ..... } if you are coding in c++, 
> otherwise the identifiers are decorated (to make overloading 
possible 
> and add some extra error checking).

I´m coding in "C", I´ve declare the functions: extern void 
ProblematicFunction (void);


I´ve brought together some .c and.s files plus a makefile in a folder 
to debug this problem. I could upload or email it if someone wants to 
test and see the problem. I´m sure i´m making an obviously mistake :).

Thanks again.

> 
> Regards,
> Richard.
> 
> 
> dgaydou wrote:
> > i´m afraid, i´ve already done it, as you tell me in your example. 
It
> > must be something else... another idea, please.
> > Thanks for your help
> >
> > --- In lpc2000@yahoogroups.com, "brendanmurphy37"
> > <brendanmurphy37@> wrote:
> > >
> > > --- In lpc2000@yahoogroups.com, "dgaydou" <dgaydou@> wrote:
> > > >
> > > > Hi group,
> > > > i`m doing my first steps with LPC2114 and gnuarm. I´ve found a
> > > trouble
> > > > when i try to link the objects files from c-sources and as-
> > sources
> > > with
> > > > arm-elf-ld and the following parameters : -Map main.map -
> > > TPruebaLPC.ld -
> > > > t. The linker tell me: Undefined reference to `THOSE FUNCTIONS
> > > THAT ARE
> > > > WROTE IN ASSEMBLER`; although i´ve declared those functions 
in my
> > > > headers files and properly included. Hope someone can help me.
> > > Thanks.
> > > >
> > >
> > > Do you have the assembler directive ".global" in the assembler
> > > source file? Without it the function name is not visible to the
> > > linker. This behaviour is different from 'C' in that the 
default is
> > > NOT to make function names visible.
> > >
> > > Example:
> > >
> > > /* list functions exported from this file */
> > >
> > > .global      GetCPSR, SomeOtherFunction
> > >
> > > /* implementation of GetCPSR */
> > >
> > > GetCPSR:
> > >     mrs  r0, cpsr  /* Get CPSR */
> > >     bx   lr        /* return to caller */
> > >
> > > This can be declared in 'C' as:
> > >
> > > unsigned int GetCPSR(void);
> > >
> > > and used as:
> > >
> > > unsigned int cpsr = GetCPSR();
> > >
> > > My guess is that this is your problem.
> > >
> > > Brendan
> > >
> >
> >
> >
> >
> >
> >
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