Christophe Leroy [off-list ref] writes:

Le 28/10/2022 à 16:33, Sathvika Vasireddy a écrit :

quoted

In a subsequent patch, we would want to annotate powerpc assembly functions
with SYM_FUNC_START_LOCAL macro. This macro depends on __ALIGN macro.

The default expansion of __ALIGN macro is:
         #define __ALIGN      .align 4,0x90

So, override __ALIGN and __ALIGN_STR macros to use the same alignment as
that of the existing _GLOBAL macro. Also, do not pad with 0x90, because
repeated 0x90s are not a nop or trap on powerpc.

By the way, do we know what the instruction 0x90909090 is on powerpc ? 
Is that something valid or not ?

According to objdump it's:

stw     r4,-28528(r16)

cheers