Re: is ARMv4T deprecated?

On April 5, 2015 9:30:30 PM GMT+02:00, Sergiy Kibrik <[email protected]> wrote:
>hi All,
>Recently I've been trying to use uClibc for quite old arm920t-based
>board. Some busybox applications (like shell, mount, hostname, wget)
>would get killed with SIGILL. I managed to debug it down to leaving
>memcpy() routine, namely to the following code from
>libc/string/arm/memcpy.S:
>
>[..]
>.thumb_func
>memcpy:
>	push	{r0, lr}
>	bl	_memcpy
>	POP_RET
>[..]
>
>POP_RET defined as pop {r2, pc} in [1]. On armv4t is just won't switch
>CPU back to arm mode, so in my case it seems to be jumping to calling
>arm routine while still being in thumb mode.
>
>I'm not sure if this is the case, but I've also found couple of
>comments
>in code:
>http://git.uclibc.org/uClibc/tree/ldso/ldso/arm/resolve.S#n62
>http://git.uclibc.org/uClibc/tree/libc/sysdeps/linux/arm/crtn.S#n10
>
>stating that some parts aren't even supposed to work on armv4t.
>Has armv4t been deprecated for good (I use master branch currently)?

I think this was a mere accident. Patches are welcome!

TIA,

>Thanks.
>
>[1]
>http://git.uclibc.org/uClibc/tree/libc/sysdeps/linux/arm/bits/arm_asm.h#n15