Re: is ARMv4T deprecated?

On 4/16/15 12:43 AM, Bernhard Reutner-Fischer wrote:
>>> >> Please send me your
>>> >> grep "memcpy\.o[sS]* " log.do_compile
>>> >> The file should be somewhere around your
>>> >> tmp-uclibc/work/armv4t-oe-linux-uclibceabi/uclibc/0.9.33+gitAUTOINC+*/temp/log.do_compile
>> >
>> > here it goes: http://pastebin.com/VGqf31ac
> arm-poky-linux-uclibceabi-gcc -march=armv4t -marm -mthumb-interwork
> -msoft-float -mlittle-endian -mthumb
> 
> I see no notion of a tune?
> 
> IIRC armv4t defaulted to arm7TDMI. Given that OE usually does not
> configure for a default CPU (AFAICS) you have to pass a proper tune.
> 
> My 920t build used:
> arm-oe-linux-uclibceabi-gcc -march=armv4t -mthumb  -mthumb-interwork
> -O2 -mtune=arm920t
> 
> in your local.conf, try:
> FULL_OPTIMIZATION = "-O2 -mtune=arm920t"
> ARM_INSTRUCTION_SET := "thumb"
> 
> maybe you need some additional settings like DEFAULTTUNE TUNE_ARCH
> TUNE_PKGARCH that you certainly use already.
> 

I tried -mtune=arm920t some time ago once, but it didn't help.

I changed return [from Thumb routine] code, and it did the trick, now
busybox and couple of utilities seems to be working (yet I didn't run
uclibc tests):

diff --git a/libc/sysdeps/linux/arm/bits/arm_asm.h
b/libc/sysdeps/linux/arm/bits/arm_asm.h
index 04664b3..78dc6f0 100644
--- a/libc/sysdeps/linux/arm/bits/arm_asm.h
+++ b/libc/sysdeps/linux/arm/bits/arm_asm.h
@@ -13,12 +13,8 @@
    unified assembly syntax.  */
 #define IT(t, cond)
 /* Code to return from a thumb function stub.  */
-#ifdef __ARM_ARCH_4T__
-#define POP_RET pop	{r2, pc}
-#else
 #define POP_RET pop	{r2, r3}; bx	r3
 #endif
-#endif

 #if defined(__ARM_ARCH_6M__)
 /* Force arm mode to flush out errors on M profile cores.  */


What do you think of such fix?

--
regards,
Sergey

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