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<h3 class="section"><code>ld</code>'s support for interworking between ARM and Thumb code</h3>



   <p>For the ARM, <code>ld</code> will generate code stubs to allow functions calls

betweem ARM and Thumb code.  These stubs only work with code that has

been compiled and assembled with the <code>-mthumb-interwork</code> command

line option.  If it is necessary to link with old ARM object files or

libraries, which have not been compiled with the -mthumb-interwork

option then the <code>--support-old-code</code> command line switch should be

given to the linker.  This will make it generate larger stub functions

which will work with non-interworking aware ARM code.  Note, however,

the linker does not support generating stubs for function calls to

non-interworking aware Thumb code.



   <p>The <code>--thumb-entry</code> switch is a duplicate of the generic

<code>--entry</code> switch, in that it sets the program's starting address. 

But it also sets the bottom bit of the address, so that it can be

branched to using a BX instruction, and the program will start

executing in Thumb mode straight away.



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