rtl problem when processing arm thumb mode switch
van.freenix at gmail.com
Thu May 9 15:00:58 UTC 2013
I am trying to make the mode switch work on rtl for arm.
The following code is disassembled using arm linux gcc.
elf object file: compiled in thumb mode.
38: f7ff bffe b.w 0 <rtems>
38: R_ARM_THM_JUMP24 rtems
It invokes a function "rtems" which are in arm mode.
elf executable file:
8414: f000 b85c b.w 84d0 <__rtems_from_thumb>
000084d0 <__rtems_from_thumb>: //stub code
84d0: 4778 bx pc
84d2: 46c0 nop ; (mov r8, r8)
84d4: eaffffc0 b 83dc <rtems>
the arm linux gcc uses a stub code to handle the thumb to arm invoking.
I also want to introduce this for arm rtl.But I do not have a good idea
about how to manage the stub code. Each rap file may contain many such
reloc entry, each such reloc entry needs a stub code.
How to manage the stub codes?
Thanks in advance.
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