On Fri, Nov 07, 2014 at 01:03:00PM +0100, Arnd Bergmann wrote: > On Friday 07 November 2014 11:55:51 Will Deacon wrote: > > We need this for arm64 and, since all architectures seem to have a mechanism > > for setting a system call via ptrace, moving it to generic code should make > > sense for new architectures too, no? > > It makes a little more sense now, but I still don't understand why you > need to set the system call number via ptrace. What is this used for, > and why doesn't any other architecture have this?
All other architectures have a way. x86, for example, you set orig_eax (or orig_rax) to change the syscall number. On ARM, that doesn't work because we don't always pass the syscall number in a register. -- FTTC broadband for 0.8mile line: currently at 9.5Mbps 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 majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/