On Fri, Jan 09, 2015 at 10:25:54AM +0000, Jon Medhurst (Tixy) wrote: > On Fri, 2015-01-09 at 14:37 +0800, Wang Nan wrote: > > + " and r4, sp, #4\n" > > + " sub sp, sp, r4\n" > > +#if __LINUX_ARM_ARCH__ >= 5 > > + " blx r2\n" > > +#else > > + " mov lr, pc\n" > > + " bx r2\n" > > I think the BX instruction is not supported for ARMv4 chips that don't > have Thumb support (e.g. SA110), at least an old ARM ARM I have says BX > is supported on "Version 5 and above, and T variants of version 4".
Correct. > Though building assabet_defconfig with kprobes enabled doesn't produce > an error for the BX instruction (!?) Which config are you using? Does it have CONFIG_CPU_32v4 enabled? That should result in "-D__LINUX_ARM_ARCH__=4 -march=armv4" being passed to the compiler (please check with make V=1). -- FTTC broadband for 0.8mile line: currently at 10.5Mbps down 400kbps up according to speedtest.net. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
