Re: [POC][RFC][PATCH 1/2] jump_function: Addition of new feature "jump_function"

[Steven Rostedt]

On Fri, 05 Oct 2018 21:51:11 -0400
Steven Rostedt <rostedt@xxxxxxxxxxx> wrote:

> +#define arch_dynfunc_trampoline(name, def)	\
> +	asm volatile (				\
> +	".globl dynfunc_" #name "; \n\t"	\
> +	"dynfunc_" #name ": \n\t"		\
> +	"jmp " #def " \n\t"			\
> +	".balign 8 \n \t"			\
> +	: : : "memory" )
> +

Note, the assembler can easily put in a two byte jump here. The .balign
was suppose to also have some padding (nop) incase that happens. It's
fine, because we can just replace it with a 5 byte jump, as long as we
have 3 bytes afterward if it is a two byte jump.

-- Steve