help Yagarto linking 32 bit arm code into CM4

magnetron Guest #3098040
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hello forum,

a simple math calculation caused my STM32F4 going into hardfault

first I asked my problem at ST forum
however it turned out that my eclipse + yagarto is the cause of the 
problem
it is linking 32 bit ARM code instead of THUMB code for my STM32F4 uC

please have a look at ;

https://my.st.com/public/STe2ecommunities/mcu/Lists/cortex_mx_stm32/Flat.aspx?RootFolder=%2fpublic%2fSTe2ecommunities%2fmcu%2fLists%2fcortex%5fmx%5fstm32%2fSTM32F4%20simple%20math%20calculation%20causes%20hardfault&FolderCTID=0x01200200770978C69A1141439FE559EB459D7580009C4E14902C3CDE46A77F0FFD06506F5B&TopicsView=https%3A%2F%2Fmy%2Est%2Ecom%2Fpublic%2FSTe2ecommunities%2Fmcu%2FLists%2Fcortex%5Fmx%5Fstm32%2FAllItems%2Easpx&currentviews=51

what is your advice for me to proceed ?

thank you
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hnuneüpe Guest #3098139
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General hint (does not necessarily solve the prob):

>$(LD) $(LDFLAGS) -T$(LINKER_SCRIPT) -o $(OUTPUT).out $(C_OBJECTS)
$(ASM_OBJECTS) -lm libgcc.a

You didn't present your def of $(LD), but it smells like you are calling 
the linker directly there.

Usually it is advisable to use gcc also for the linking step,
i.e.

LD = arm-none-eabi-gcc

rather than

LD = arm-none-eabi-ld

(or whatever prefix the yagarto tools are using) and then omit
the libgcc.a from the command.

The gcc compiler driver has built-in intelligence to link the
proper runtime libs - depending on the mach options it is passed.

And when specifying a lib on the command line, the usual syntax is
-lgcc to link a lib named libgcc.a (in the same way as -lm links a
lib named libm.a - the "lib" prefix and ".a" suffix are omitted ). But 
that might be handled differently between Unix and
Windows platforms.

Also have the linker produce a map file and verify that the right libs 
are
linked.
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Michael F. #3098372
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Hello magnetron,

use this example here:
http://www.emb4fun.de/download/arm/examples/STM32F407Test.zip

Add your code:

1
  float hypo2;

2
  int32_t XH=7,YH=8;

3


4
  hypo2= (XH*(XH*1.0) + YH*(YH*1.0));


It will work :o)
As hnuneüpe has written before, do not use the linker
direct. Use the GCC for linking too. At my page you will
find some small examples to start:
http://www.emb4fun.de/arm/examples/index.html

Best regards,
Michael
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magnetron Guest #3098480
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hello,

I changed this line from
>$(LD) $(LDFLAGS) -T$(LINKER_SCRIPT) -o $(OUTPUT).out $(C_OBJECTS) >$(ASM_OBJECTS) 
-lm libgcc.a

to
>$(LD) $(LDFLAGS) -T$(LINKER_SCRIPT) -o $(OUTPUT).out $(C_OBJECTS) >$(ASM_OBJECTS) 
-lm

and the error was removed

thank you for your answers

note: I was already using gcc instead of ld
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