On Thu, Feb 09, 2017 at 04:38:32PM +0100, Jean-Jacques Hiblot wrote: > 2017-02-07 23:57 GMT+01:00 Abel Vesa <abelv...@linux.com>: > > +#ifdef CONFIG_FUNCTION_GRAPH_TRACER > > +.macro __ftrace_graph_regs_caller > > + > > + sub r0, fp, #4 @ lr of instrumented routine > > (parent) > > + > > + @ called from __ftrace_regs_caller > > + ldr r1, [sp, #56] @ instrumented routine (func) > > + mcount_adjust_addr r1, r1 > > + > > + sub r2, r0, #4 @ frame pointer > why not mov r2, fp ?
r0 = fp - 4 r2 = r0 - 4 therefore r2 = (fp - 4) - 4 r2 = fp - 8, not r2 = fp -- RMK's Patch system: http://www.armlinux.org.uk/developer/patches/ FTTC broadband for 0.8mile line: currently at 9.6Mbps down 400kbps up according to speedtest.net.