On Wed, Aug 06, 2014 at 03:23:23PM +0100, Jon Medhurst (Tixy) wrote:
> On Tue, 2014-08-05 at 15:28 +0800, Wang Nan wrote:
> > +static inline int
> > +arm_branch_to_addr(unsigned int *pinst, void *src, void *dest)
> > +{
> > + unsigned int inst = 0xea000000;
> > + long offset = (unsigned long)(dest) -
> > + ((unsigned long)(src) + 8);
> > + if ((offset > 0x3fffffc) || (offset < -0x3fffffc)) {
> > + printk(KERN_WARNING "Failed to instrument %pS to %pS\n", src,
> > dest);
> > + return -EINVAL;
> > + }
> > +
> > + inst |= (((unsigned long)offset) >> 2) & (0x00ffffffUL);
> > + *pinst = inst;
> > + return 0;
> > +}
> > +
>
> This looks remarkably similar to the code in arch/arm/kernel/insn.c so I
> think you can probably just use the existing arm_gen_branch() function.
Which would be a better idea as the version found in insn.c is not
buggy.
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