Subject: Re: [PATCH v2 15/16] objtool/powerpc: Enable objtool to be built on ppc

From: Segher Boessenkool <[email-masked]>
Date: Thu, 1 Sep 2022 10:11:17 -0500

On Thu, Sep 01, 2022 at 09:32:46AM +0000, Christophe Leroy wrote:
> Le 29/08/2022 à 07:52, Sathvika Vasireddy a écrit :
> > +int arch_decode_instruction(struct objtool_file *file, const struct section *sec,
> > +			    unsigned long offset, unsigned int maxlen,
> > +			    unsigned int *len, enum insn_type *type,
> > +			    unsigned long *immediate,
> > +			    struct list_head *ops_list)
> > +{
> > +	u32 insn;
> > +
> > +	*immediate = 0;
> > +	insn = bswap_if_needed(file->elf, *(u32 *)(sec->data->d_buf + offset));
> > +	*len = 4;
> 
> Should be *len = 8 when insn >> 26 == 1.

But please use ppc_inst_prefixed().  And just use ppc_inst_len() here?

Not having convenience abstraction functions like that will give you
much more work in the future -- currently all prefix insns use primary
opcode 1, sure, and nothing else does; but this can change.

Segher