Yu-cheng, Am 20.06.2017 um 20:04 schrieb Yu-cheng Yu: >>> So to summarize: >>> >>> - PTRACE_GETREGSET with NT_X86_XSTATE gets 832 and return 832, with no >>> error. >>> >>> - PTRACE_SETREGSET get 832 (sizeof struct _xstate) but wants at least >>> 1088, otherwise it will fail with -EFAULT (why not -EINVAL?) >>> >>> Ideas? > > We considered allowing a partial XSAVE buffer for PTRACE_SETREGSET, but > it was that the XSAVE instruction requires a full-size buffer led to > this choice. Using a smaller buffer for XSAVE causes a fault.
So, this code is not supposed to work? iov.iov_base = fp_regs; iov.iov_len = sizeof(struct _xstate); ptrace(PTRACE_GETREGSET, pid, NT_X86_XSTATE, &iov); ptrace(PTRACE_SETREGSET, pid, NT_X86_XSTATE, &iov); This is what UML does and on Thomas's new Laptop PTRACE_SETREGSET is failing. Thanks, //richard ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ User-mode-linux-devel mailing list User-mode-linux-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/user-mode-linux-devel
