10Sstevel@tonic-gate /*
20Sstevel@tonic-gate * CDDL HEADER START
30Sstevel@tonic-gate *
40Sstevel@tonic-gate * The contents of this file are subject to the terms of the
5*9351SPrashanth.Sreenivasa@Sun.COM * Common Development and Distribution License (the "License").
6*9351SPrashanth.Sreenivasa@Sun.COM * You may not use this file except in compliance with the License.
70Sstevel@tonic-gate *
80Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
90Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing.
100Sstevel@tonic-gate * See the License for the specific language governing permissions
110Sstevel@tonic-gate * and limitations under the License.
120Sstevel@tonic-gate *
130Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each
140Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
150Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the
160Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying
170Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner]
180Sstevel@tonic-gate *
190Sstevel@tonic-gate * CDDL HEADER END
200Sstevel@tonic-gate */
21*9351SPrashanth.Sreenivasa@Sun.COM
220Sstevel@tonic-gate /*
23*9351SPrashanth.Sreenivasa@Sun.COM * Copyright 2009 Sun Microsystems, Inc. All rights reserved.
240Sstevel@tonic-gate * Use is subject to license terms.
250Sstevel@tonic-gate */
260Sstevel@tonic-gate
270Sstevel@tonic-gate /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
280Sstevel@tonic-gate
290Sstevel@tonic-gate #include <sys/param.h>
300Sstevel@tonic-gate #include <sys/types.h>
310Sstevel@tonic-gate #include <sys/sysmacros.h>
320Sstevel@tonic-gate #include <sys/systm.h>
330Sstevel@tonic-gate #include <sys/errno.h>
340Sstevel@tonic-gate #include <sys/syscall.h>
350Sstevel@tonic-gate #include <sys/proc.h>
360Sstevel@tonic-gate #include <sys/processor.h>
370Sstevel@tonic-gate #include <sys/fault.h>
380Sstevel@tonic-gate #include <sys/ucontext.h>
390Sstevel@tonic-gate #include <sys/signal.h>
400Sstevel@tonic-gate #include <sys/unistd.h>
410Sstevel@tonic-gate #include <sys/procfs.h>
420Sstevel@tonic-gate #include <sys/prsystm.h>
430Sstevel@tonic-gate #include <sys/cmn_err.h>
440Sstevel@tonic-gate #include <sys/debug.h>
450Sstevel@tonic-gate #include <sys/klwp.h>
460Sstevel@tonic-gate #include <sys/pool.h>
470Sstevel@tonic-gate
480Sstevel@tonic-gate /*
490Sstevel@tonic-gate * System call to create an lwp.
500Sstevel@tonic-gate *
510Sstevel@tonic-gate * Notes on the LWP_DETACHED and LWP_DAEMON flags:
520Sstevel@tonic-gate *
530Sstevel@tonic-gate * A detached lwp (LWP_DETACHED) cannot be the specific target of
540Sstevel@tonic-gate * lwp_wait() (it is not joinable), but lwp_wait(0, ...) is required
550Sstevel@tonic-gate * to sleep until all non-daemon detached lwps have terminated before
560Sstevel@tonic-gate * returning EDEADLK because a detached lwp might create a non-detached lwp
570Sstevel@tonic-gate * that could then be returned by lwp_wait(0, ...). See also lwp_detach().
580Sstevel@tonic-gate *
590Sstevel@tonic-gate * A daemon lwp (LWP_DAEMON) is a detached lwp that has the additional
600Sstevel@tonic-gate * property that it does not affect the termination condition of the
610Sstevel@tonic-gate * process: The last non-daemon lwp to call lwp_exit() causes the process
620Sstevel@tonic-gate * to exit and lwp_wait(0, ...) does not sleep waiting for daemon lwps
630Sstevel@tonic-gate * to terminate. See the block comment before lwp_wait().
640Sstevel@tonic-gate */
650Sstevel@tonic-gate int
syslwp_create(ucontext_t * ucp,int flags,id_t * new_lwp)660Sstevel@tonic-gate syslwp_create(ucontext_t *ucp, int flags, id_t *new_lwp)
670Sstevel@tonic-gate {
680Sstevel@tonic-gate klwp_t *lwp;
690Sstevel@tonic-gate proc_t *p = ttoproc(curthread);
700Sstevel@tonic-gate kthread_t *t;
710Sstevel@tonic-gate ucontext_t uc;
720Sstevel@tonic-gate #ifdef _SYSCALL32_IMPL
730Sstevel@tonic-gate ucontext32_t uc32;
740Sstevel@tonic-gate #endif /* _SYSCALL32_IMPL */
750Sstevel@tonic-gate k_sigset_t sigmask;
760Sstevel@tonic-gate int tid;
770Sstevel@tonic-gate model_t model = get_udatamodel();
780Sstevel@tonic-gate uintptr_t thrptr = 0;
790Sstevel@tonic-gate
800Sstevel@tonic-gate if (flags & ~(LWP_DAEMON|LWP_DETACHED|LWP_SUSPENDED))
810Sstevel@tonic-gate return (set_errno(EINVAL));
820Sstevel@tonic-gate
830Sstevel@tonic-gate /*
840Sstevel@tonic-gate * lwp_create() is disallowed for the /proc agent lwp.
850Sstevel@tonic-gate */
860Sstevel@tonic-gate if (curthread == p->p_agenttp)
870Sstevel@tonic-gate return (set_errno(ENOTSUP));
880Sstevel@tonic-gate
890Sstevel@tonic-gate if (model == DATAMODEL_NATIVE) {
900Sstevel@tonic-gate if (copyin(ucp, &uc, sizeof (ucontext_t)))
910Sstevel@tonic-gate return (set_errno(EFAULT));
920Sstevel@tonic-gate sigutok(&uc.uc_sigmask, &sigmask);
930Sstevel@tonic-gate #if defined(__i386)
940Sstevel@tonic-gate /*
950Sstevel@tonic-gate * libc stashed thrptr into unused kernel %sp.
960Sstevel@tonic-gate * See setup_context() in libc.
970Sstevel@tonic-gate */
980Sstevel@tonic-gate thrptr = (uint32_t)uc.uc_mcontext.gregs[ESP];
990Sstevel@tonic-gate #endif
1000Sstevel@tonic-gate }
1010Sstevel@tonic-gate #ifdef _SYSCALL32_IMPL
1020Sstevel@tonic-gate else {
1030Sstevel@tonic-gate if (copyin(ucp, &uc32, sizeof (ucontext32_t)))
1040Sstevel@tonic-gate return (set_errno(EFAULT));
1050Sstevel@tonic-gate sigutok(&uc32.uc_sigmask, &sigmask);
1060Sstevel@tonic-gate #if defined(__sparc)
1070Sstevel@tonic-gate ucontext_32ton(&uc32, &uc, NULL, NULL);
1080Sstevel@tonic-gate #else /* __amd64 */
1090Sstevel@tonic-gate ucontext_32ton(&uc32, &uc);
1100Sstevel@tonic-gate /*
1110Sstevel@tonic-gate * libc stashed thrptr into unused kernel %sp.
1120Sstevel@tonic-gate * See setup_context() in libc.
1130Sstevel@tonic-gate */
1140Sstevel@tonic-gate thrptr = (uint32_t)uc32.uc_mcontext.gregs[ESP];
1150Sstevel@tonic-gate #endif
1160Sstevel@tonic-gate }
1170Sstevel@tonic-gate #endif /* _SYSCALL32_IMPL */
1180Sstevel@tonic-gate
119*9351SPrashanth.Sreenivasa@Sun.COM /*
120*9351SPrashanth.Sreenivasa@Sun.COM * Tell machine specific code that we are creating a new lwp
121*9351SPrashanth.Sreenivasa@Sun.COM */
122*9351SPrashanth.Sreenivasa@Sun.COM LWP_MMODEL_NEWLWP();
123*9351SPrashanth.Sreenivasa@Sun.COM
1240Sstevel@tonic-gate (void) save_syscall_args(); /* save args for tracing first */
1250Sstevel@tonic-gate
1260Sstevel@tonic-gate mutex_enter(&curproc->p_lock);
1270Sstevel@tonic-gate pool_barrier_enter();
1280Sstevel@tonic-gate mutex_exit(&curproc->p_lock);
1290Sstevel@tonic-gate lwp = lwp_create(lwp_rtt, NULL, NULL, curproc, TS_STOPPED,
130*9351SPrashanth.Sreenivasa@Sun.COM curthread->t_pri, &sigmask, curthread->t_cid, 0);
1310Sstevel@tonic-gate mutex_enter(&curproc->p_lock);
1320Sstevel@tonic-gate pool_barrier_exit();
1330Sstevel@tonic-gate mutex_exit(&curproc->p_lock);
1340Sstevel@tonic-gate if (lwp == NULL)
1350Sstevel@tonic-gate return (set_errno(EAGAIN));
1360Sstevel@tonic-gate
1370Sstevel@tonic-gate lwp_load(lwp, uc.uc_mcontext.gregs, thrptr);
1380Sstevel@tonic-gate
1390Sstevel@tonic-gate t = lwptot(lwp);
1400Sstevel@tonic-gate /*
1410Sstevel@tonic-gate * Copy the new lwp's lwpid into the caller's specified buffer.
1420Sstevel@tonic-gate */
1430Sstevel@tonic-gate if (new_lwp && copyout(&t->t_tid, new_lwp, sizeof (id_t))) {
1440Sstevel@tonic-gate /*
1450Sstevel@tonic-gate * caller's buffer is not writable, return
1460Sstevel@tonic-gate * EFAULT, and terminate new lwp.
1470Sstevel@tonic-gate */
1480Sstevel@tonic-gate mutex_enter(&p->p_lock);
1490Sstevel@tonic-gate t->t_proc_flag |= TP_EXITLWP;
1500Sstevel@tonic-gate t->t_sig_check = 1;
1510Sstevel@tonic-gate t->t_sysnum = 0;
1520Sstevel@tonic-gate t->t_proc_flag &= ~TP_HOLDLWP;
1530Sstevel@tonic-gate lwp_create_done(t);
1540Sstevel@tonic-gate mutex_exit(&p->p_lock);
1550Sstevel@tonic-gate return (set_errno(EFAULT));
1560Sstevel@tonic-gate }
1570Sstevel@tonic-gate
1580Sstevel@tonic-gate /*
1590Sstevel@tonic-gate * clone callers context, if any. must be invoked
1600Sstevel@tonic-gate * while -not- holding p_lock.
1610Sstevel@tonic-gate */
1620Sstevel@tonic-gate if (curthread->t_ctx)
1630Sstevel@tonic-gate lwp_createctx(curthread, t);
1640Sstevel@tonic-gate
1650Sstevel@tonic-gate /*
1660Sstevel@tonic-gate * copy current contract templates
1670Sstevel@tonic-gate */
1680Sstevel@tonic-gate lwp_ctmpl_copy(lwp, ttolwp(curthread));
1690Sstevel@tonic-gate
1700Sstevel@tonic-gate mutex_enter(&p->p_lock);
1710Sstevel@tonic-gate /*
1720Sstevel@tonic-gate * Copy the syscall arguments to the new lwp's arg area
1730Sstevel@tonic-gate * for the benefit of debuggers.
1740Sstevel@tonic-gate */
1750Sstevel@tonic-gate t->t_sysnum = SYS_lwp_create;
1760Sstevel@tonic-gate lwp->lwp_ap = lwp->lwp_arg;
1770Sstevel@tonic-gate lwp->lwp_arg[0] = (long)ucp;
1780Sstevel@tonic-gate lwp->lwp_arg[1] = (long)flags;
1790Sstevel@tonic-gate lwp->lwp_arg[2] = (long)new_lwp;
1800Sstevel@tonic-gate lwp->lwp_argsaved = 1;
1810Sstevel@tonic-gate
1820Sstevel@tonic-gate if (!(flags & (LWP_DETACHED|LWP_DAEMON)))
1830Sstevel@tonic-gate t->t_proc_flag |= TP_TWAIT;
1840Sstevel@tonic-gate if (flags & LWP_DAEMON) {
1850Sstevel@tonic-gate t->t_proc_flag |= TP_DAEMON;
1860Sstevel@tonic-gate p->p_lwpdaemon++;
1870Sstevel@tonic-gate }
1880Sstevel@tonic-gate
1890Sstevel@tonic-gate tid = (int)t->t_tid; /* for /proc debuggers */
1900Sstevel@tonic-gate
1910Sstevel@tonic-gate /*
1920Sstevel@tonic-gate * We now set the newly-created lwp running.
1930Sstevel@tonic-gate * If it is being created as LWP_SUSPENDED, we leave its
1940Sstevel@tonic-gate * TP_HOLDLWP flag set so it will stop in system call exit.
1950Sstevel@tonic-gate */
1960Sstevel@tonic-gate if (!(flags & LWP_SUSPENDED))
1970Sstevel@tonic-gate t->t_proc_flag &= ~TP_HOLDLWP;
1980Sstevel@tonic-gate lwp_create_done(t);
1990Sstevel@tonic-gate mutex_exit(&p->p_lock);
2000Sstevel@tonic-gate
2010Sstevel@tonic-gate return (tid);
2020Sstevel@tonic-gate }
2030Sstevel@tonic-gate
2040Sstevel@tonic-gate /*
2050Sstevel@tonic-gate * Exit the calling lwp
2060Sstevel@tonic-gate */
2070Sstevel@tonic-gate void
syslwp_exit()2080Sstevel@tonic-gate syslwp_exit()
2090Sstevel@tonic-gate {
2100Sstevel@tonic-gate proc_t *p = ttoproc(curthread);
2110Sstevel@tonic-gate
2120Sstevel@tonic-gate mutex_enter(&p->p_lock);
2130Sstevel@tonic-gate lwp_exit();
2140Sstevel@tonic-gate /* NOTREACHED */
2150Sstevel@tonic-gate }
216