On Mon, 2008-12-15 at 10:00 +0100, Markus Barenhoff wrote:
> Hi,
>
> I've a problem with a array of void*, with different versions of arm-elf-gcc.
> Tried it with 4.3.1 and with current HEAD 4.4.0 from CVS.. Problem seems to
> exists von both versions. I've created a small example of it:
>
> ---- snip ----
> void a(void);
>
> void (**v)(void) = { &a };
>
> int main()
> {
> v[0]();
> return 0;
> }
>
> void a(void) { }
> ---- snip ----
>
> I compiled it for cortex-m3 and if I look at the created binary with objdump,
> I see, the following for v:
>
> ---- snip ----
> a.out: file format elf32-littlearm
>
> 000118d0 <v>:
> 118d0: 0000819d .word 0x0000819d
> ---- snip ----
>
> but the problem is, that the function a is located at 0x819c and not 0x819...
Indeed, but it's not a problem. The bottom bit indicates that the
instruction at that address is Thumb, not ARM (all instructions on ARM
systems are at least 2-byte aligned, so bit[0] is used to describe the
instruction set).
R.
