[PATCH 0/2] powerpc: Disable syscall emulation and stepping

[Christophe Leroy]

Le 24/01/2022 à 06:57, Nicholas Piggin a écrit :
> As discussed previously
> 
> https://lists.ozlabs.org/pipermail/linuxppc-dev/2022-January/238946.html
> 
> I'm wondering whether PPC32 should be returning -1 for syscall
> instructions too here? That could be done in another patch anyway.
> 

The 'Programming Environments Manual for 32-Bit Implementations of the 
PowerPC™ Architecture' says:

The following are not traced:
• rfi instruction
• sc and trap instructions that trap
• Other instructions that cause interrupts (other than trace interrupts)
• The first instruction of any interrupt handler
• Instructions that are emulated by software


So I think PPC32 should return -1 as well.

Christophe