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Re: ARM long branch stub: thumb
On Fri, 2009-02-20 at 15:15 +0100, Christophe LYON wrote:
> static const bfd_vma elf32_arm_stub_long_branch_v4t_thumb_arm[] =
> {
> - 0x4e03b540, /* push {r6, lr} */
> - /* ldr r6, [pc, #12] */
> - 0x473046fe, /* mov lr, pc */
> - /* bx r6 */
> - 0xe8bd4040, /* pop {r6, pc} */
> - 0xe12fff1e, /* bx lr */
> - 0x00000000, /* dcd R_ARM_ABS32(X) */
> + 0x46c04778, /* bx pc */
> + /* nop */
> + 0xe51ff004, /* ldr pc, [pc, #-4] */
> + 0x00000000, /* dcd R_ARM_ABS32(X) */
> };
Unless I've missed a correction going on elsewhere, this isn't going to
work for BE-8 mode. The rules for manipulating thumb and ARM opcodes are
different (swap-16 and swap-32 respectively), and the code has to know
what instructions are at each address (the old code wouldn't have that
problem as it was all Thumb code).