kernel/syscall/profil.c

   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  * Copyright 2012 Milan Jurik. All rights reserved.
  26  */
  27
  28 /*      Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
  29 /*        All Rights Reserved   */
  30
  31 #include <sys/param.h>
  32 #include <sys/types.h>
  33 #include <sys/sysmacros.h>
  34 #include <sys/systm.h>
  35 #include <sys/errno.h>
  36 #include <sys/proc.h>
  37 #include <sys/debug.h>
  38
  39 /*
  40  * Profiling.
  41  */
  42 int
  43 profil(unsigned short *bufbase, size_t bufsize, ulong_t pcoffset,
  44     uint_t pcscale)
  45 {
  46         struct proc *p = ttoproc(curthread);
  47
  48         if (pcscale == 1)
  49                 pcscale = 0;
  50
  51         mutex_enter(&p->p_pflock);
  52         p->p_prof.pr_base = bufbase;
  53         p->p_prof.pr_size = bufsize;
  54         p->p_prof.pr_off = pcoffset;
  55         p->p_prof.pr_scale = pcscale;
  56
  57         /* pcsample and profil are mutually exclusive */
  58         p->p_prof.pr_samples = 0;
  59
  60         mutex_exit(&p->p_pflock);
  61         mutex_enter(&p->p_lock);
  62         set_proc_post_sys(p);   /* activate post_syscall profiling code */
  63         mutex_exit(&p->p_lock);
  64         return (0);
  65 }
  66
  67
  68 /*
  69  * PC Sampling
  70  */
  71 long
  72 pcsample(void *buf, long nsamples)
  73 {
  74         struct proc *p = ttoproc(curthread);
  75         long count = 0;
  76
  77         if (nsamples < 0 ||
  78             ((get_udatamodel() != DATAMODEL_NATIVE) && (nsamples > INT32_MAX)))
  79                 return (set_errno(EINVAL));
  80
  81         mutex_enter(&p->p_pflock);
  82         p->p_prof.pr_base = buf;
  83         p->p_prof.pr_size = nsamples;
  84         p->p_prof.pr_scale = 1;
  85         count = p->p_prof.pr_samples;
  86         p->p_prof.pr_samples = 0;
  87         mutex_exit(&p->p_pflock);
  88
  89         mutex_enter(&p->p_lock);
  90         set_proc_post_sys(p);   /* activate post_syscall profiling code */
  91         mutex_exit(&p->p_lock);
  92
  93         return (count);
  94 }