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      1 /*
      2  * CDDL HEADER START
      3  *
      4  * The contents of this file are subject to the terms of the
      5  * Common Development and Distribution License, Version 1.0 only
      6  * (the "License").  You may not use this file except in compliance
      7  * with the License.
      8  *
      9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
     10  * or http://www.opensolaris.org/os/licensing.
     11  * See the License for the specific language governing permissions
     12  * and limitations under the License.
     13  *
     14  * When distributing Covered Code, include this CDDL HEADER in each
     15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
     16  * If applicable, add the following below this CDDL HEADER, with the
     17  * fields enclosed by brackets "[]" replaced with your own identifying
     18  * information: Portions Copyright [yyyy] [name of copyright owner]
     19  *
     20  * CDDL HEADER END
     21  */
     22 /*
     23  * Copyright (c) 1998, Sun Microsystems, Inc.
     24  * All rights reserved.
     25  */
     26 
     27 /*	Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T	*/
     28 /*	  All Rights Reserved	*/
     29 
     30 
     31 #ident	"@(#)profil.c	1.8	05/06/08 SMI"	/* from SVr4.0 1.78 */
     32 
     33 #include <sys/param.h>
     34 #include <sys/types.h>
     35 #include <sys/sysmacros.h>
     36 #include <sys/systm.h>
     37 #include <sys/errno.h>
     38 #include <sys/proc.h>
     39 #include <sys/debug.h>
     40 
     41 /*
     42  * Profiling.
     43  */
     44 int
     45 profil(unsigned short *bufbase, size_t bufsize, u_long pcoffset, u_int pcscale)
     46 {
     47 	struct proc *p = ttoproc(curthread);
     48 
     49 	if (pcscale == 1)
     50 		pcscale = 0;
     51 
     52 	mutex_enter(&p->p_pflock);
     53 	p->p_prof.pr_base = bufbase;
     54 	p->p_prof.pr_size = bufsize;
     55 	p->p_prof.pr_off = pcoffset;
     56 	p->p_prof.pr_scale = pcscale;
     57 
     58 	/* pcsample and profil are mutually exclusive */
     59 	p->p_prof.pr_samples = 0;
     60 
     61 	mutex_exit(&p->p_pflock);
     62 	mutex_enter(&p->p_lock);
     63 	set_proc_post_sys(p);	/* activate post_syscall profiling code */
     64 	mutex_exit(&p->p_lock);
     65 	return (0);
     66 }
     67 
     68 
     69 /*
     70  * PC Sampling
     71  */
     72 long
     73 pcsample(void *buf, long nsamples)
     74 {
     75 	struct proc *p = ttoproc(curthread);
     76 	long count = 0;
     77 
     78 	if (nsamples < 0 ||
     79 	    ((get_udatamodel() != DATAMODEL_NATIVE) && (nsamples > INT32_MAX)))
     80 		return (set_errno(EINVAL));
     81 
     82 	mutex_enter(&p->p_pflock);
     83 	p->p_prof.pr_base = buf;
     84 	p->p_prof.pr_size = nsamples;
     85 	p->p_prof.pr_scale = 1;
     86 	count = p->p_prof.pr_samples;
     87 	p->p_prof.pr_samples = 0;
     88 	mutex_exit(&p->p_pflock);
     89 
     90 	mutex_enter(&p->p_lock);
     91 	set_proc_post_sys(p);	/* activate post_syscall profiling code */
     92 	mutex_exit(&p->p_lock);
     93 
     94 	return (count);
     95 }
     96