GNU LD fails to generate correct ARM Thumb veneer

[Aaron P. D'Souza]

hello Nick:

thank you for your prompt response. i have seen your crt0.S.

>> - the first file to be linked is an ARM assembly .s file
>>   that contains the ARM vector table and handler addresses.
>>   the vector table is in a separate section called .VhaInit.
> 
> Did you know that you can use the KEEP directive in a linker script (or 
> a linker script fragment) in order to make sure that the .VhaInit 
> section is not garbage collected ?

yes. i avoided using a linker script. i use objcopy and move the
LMA as needed for ROM programs.

>> - when i add code to access .VhaInit entries from .text to prevent the
>>   garbage collection of .VhaInit, Thumb Interworking code is ZERO. the
>>   entries are present, but no interworking code is present.
> 
> What sort of code are you adding and how are you adding it ?

.section .VhaInit, "a"
.align 0

AppTextVha:

@ V: ARM Vectors
ResetVec:   LDR    PC, ResetAddr    @ Reset
[...]

@ HA: our Handler Addresses
ResetAddr:  .word  ResetHandler @ Reset
[...]

AppTextVStart:

@ UH: our Unused Handlers
ResetHolder:    B      .        @ Reset

     LDR  R1, =AppTextVha
     LDR  R1, =AppTextVStart

>> - when i remove code that accesses .VhaInit, Interworking code is
>>   correct.

> You try to isolate whether this really is a linker bug.  (It
> certainly sounds like it is).  If you can reproduce the problem
> just using assembler source files then please file a bug report
> with the binutils project (at http://sourceware.org/bugzilla).
> Including a *small* test case will really help.

okay. i will send you one.

thank you once again,

Aaron
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