Author: kib Date: Tue Sep 24 12:24:48 2013 New Revision: 255844 URL: http://svnweb.freebsd.org/changeset/base/255844
Log: Ensure that the ERESTART return from the syscall reloads the registers, to make the restarted syscall instruction pass the correct arguments. PR: kern/182161 Reported by: Russ Cox <[email protected]> Sponsored by: The FreeBSD Foundation MFC after: 3 days Approved by: re (marius) Modified: head/sys/amd64/amd64/vm_machdep.c Modified: head/sys/amd64/amd64/vm_machdep.c ============================================================================== --- head/sys/amd64/amd64/vm_machdep.c Tue Sep 24 11:49:04 2013 (r255843) +++ head/sys/amd64/amd64/vm_machdep.c Tue Sep 24 12:24:48 2013 (r255844) @@ -400,9 +400,13 @@ cpu_set_syscall_retval(struct thread *td * for the next iteration. * %r10 restore is only required for freebsd/amd64 processes, * but shall be innocent for any ia32 ABI. + * + * Require full context restore to get the arguments + * in the registers reloaded at return to usermode. */ td->td_frame->tf_rip -= td->td_frame->tf_err; td->td_frame->tf_r10 = td->td_frame->tf_rcx; + set_pcb_flags(td->td_pcb, PCB_FULL_IRET); break; case EJUSTRETURN: _______________________________________________ [email protected] mailing list http://lists.freebsd.org/mailman/listinfo/svn-src-all To unsubscribe, send any mail to "[email protected]"
