bsd/sys/gmon.h

   1 /*
   2  * Copyright (c) 2000, 2007 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28 /* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
  29 /*-
  30  * Copyright (c) 1982, 1986, 1992, 1993
  31  *      The Regents of the University of California.  All rights reserved.
  32  *
  33  * Redistribution and use in source and binary forms, with or without
  34  * modification, are permitted provided that the following conditions
  35  * are met:
  36  * 1. Redistributions of source code must retain the above copyright
  37  *    notice, this list of conditions and the following disclaimer.
  38  * 2. Redistributions in binary form must reproduce the above copyright
  39  *    notice, this list of conditions and the following disclaimer in the
  40  *    documentation and/or other materials provided with the distribution.
  41  * 3. All advertising materials mentioning features or use of this software
  42  *    must display the following acknowledgement:
  43  *      This product includes software developed by the University of
  44  *      California, Berkeley and its contributors.
  45  * 4. Neither the name of the University nor the names of its contributors
  46  *    may be used to endorse or promote products derived from this software
  47  *    without specific prior written permission.
  48  *
  49  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  50  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  51  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  52  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  53  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  54  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  55  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  56  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  57  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  58  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  59  * SUCH DAMAGE.
  60  *
  61  *      @(#)gmon.h      8.2 (Berkeley) 1/4/94
  62  */
  63
  64 #ifndef _SYS_GMON_H_
  65 #define _SYS_GMON_H_
  66 #include <stdint.h>
  67
  68 /*
  69  * Structure prepended to gmon.out profiling data file.
  70  */
  71 struct gmonhdr {
  72         uint32_t lpc;           /* base pc address of sample buffer */
  73         uint32_t hpc;           /* max pc address of sampled buffer */
  74         uint32_t ncnt;          /* size of sample buffer (plus this header) */
  75         int32_t version;        /* version number */
  76         int32_t profrate;       /* profiling clock rate */
  77         int32_t spare[3];       /* reserved */
  78 };
  79 #define GMONVERSION     0x00051879
  80
  81 struct gmonhdr_64 {
  82         uint64_t lpc;           /* base pc address of sample buffer */
  83         uint64_t hpc;           /* max pc address of sampled buffer */
  84         uint32_t ncnt;          /* size of sample buffer (plus this header) */
  85         int32_t version;        /* version number */
  86         int32_t profrate;       /* profiling clock rate */
  87         int32_t spare[3];       /* reserved */
  88 };
  89
  90 typedef struct
  91 #ifndef __LP64__
  92         gmonhdr
  93 #else
  94         gmonhdr_64
  95 #endif
  96 gmonhdr_t;
  97
  98 /*
  99  * histogram counters are unsigned shorts (according to the kernel).
 100  */
 101 #define HISTCOUNTER     unsigned short
 102
 103 /*
 104  * fraction of text space to allocate for histogram counters here, 1/2
 105  */
 106 #define HISTFRACTION    2
 107
 108 /*
 109  * Fraction of text space to allocate for from hash buckets.
 110  * The value of HASHFRACTION is based on the minimum number of bytes
 111  * of separation between two subroutine call points in the object code.
 112  * Given MIN_SUBR_SEPARATION bytes of separation the value of
 113  * HASHFRACTION is calculated as:
 114  *
 115  *      HASHFRACTION = MIN_SUBR_SEPARATION / (2 * sizeof(short) - 1);
 116  *
 117  * For example, on the VAX, the shortest two call sequence is:
 118  *
 119  *      calls   $0,(r0)
 120  *      calls   $0,(r0)
 121  *
 122  * which is separated by only three bytes, thus HASHFRACTION is
 123  * calculated as:
 124  *
 125  *      HASHFRACTION = 3 / (2 * 2 - 1) = 1
 126  *
 127  * Note that the division above rounds down, thus if MIN_SUBR_FRACTION
 128  * is less than three, this algorithm will not work!
 129  *
 130  * In practice, however, call instructions are rarely at a minimal
 131  * distance.  Hence, we will define HASHFRACTION to be 2 across all
 132  * architectures.  This saves a reasonable amount of space for
 133  * profiling data structures without (in practice) sacrificing
 134  * any granularity.
 135  */
 136 #define HASHFRACTION    2
 137
 138 /*
 139  * percent of text space to allocate for tostructs with a minimum.
 140  */
 141 #define ARCDENSITY      2
 142 #define MINARCS         50
 143 #define MAXARCS         ((1 << (8 * sizeof(HISTCOUNTER))) - 2)
 144
 145 struct tostruct {
 146         uint32_t        selfpc;
 147         int32_t         count;
 148         uint16_t        link;
 149         uint16_t        order;
 150 };
 151
 152 struct tostruct_64 {
 153         uint64_t        selfpc;
 154         int32_t         count;
 155         uint16_t        link;
 156         uint16_t        order;
 157 };
 158
 159 typedef struct
 160 #ifndef __LP64__
 161         tostruct
 162 #else
 163         tostruct_64
 164 #endif
 165 tostruct_t;
 166
 167 /*
 168  * a raw arc, with pointers to the calling site and
 169  * the called site and a count.
 170  */
 171 struct rawarc {
 172         uint32_t        raw_frompc;
 173         uint32_t        raw_selfpc;
 174         int32_t         raw_count;
 175 };
 176
 177 struct rawarc_64 {
 178         uint64_t        raw_frompc;
 179         uint64_t        raw_selfpc;
 180         int32_t         raw_count;
 181 };
 182
 183 typedef struct
 184 #ifndef __LP64__
 185         rawarc
 186 #else
 187         rawarc_64
 188 #endif
 189 rawarc_t;
 190
 191 /*
 192  * general rounding functions.
 193  */
 194 #define ROUNDDOWN(x,y)  (((x)/(y))*(y))
 195 #define ROUNDUP(x,y)    ((((x)+(y)-1)/(y))*(y))
 196
 197 /*
 198  * The profiling data structures are housed in this structure.
 199  */
 200 struct gmonparam {
 201         int             state;
 202         u_short         *kcount;
 203         u_long          kcountsize;
 204         u_short         *froms;
 205         u_long          fromssize;
 206         tostruct_t      *tos;
 207         u_long          tossize;
 208         long            tolimit;
 209         u_long          lowpc;
 210         u_long          highpc;
 211         u_long          textsize;
 212         u_long          hashfraction;
 213 };
 214 extern struct gmonparam _gmonparam;
 215
 216 /*
 217  * Possible states of profiling.
 218  */
 219 #define GMON_PROF_ON    0
 220 #define GMON_PROF_BUSY  1
 221 #define GMON_PROF_ERROR 2
 222 #define GMON_PROF_OFF   3
 223
 224 /*
 225  * Sysctl definitions for extracting profiling information from the kernel.
 226  */
 227 #define GPROF_STATE     0       /* int: profiling enabling variable */
 228 #define GPROF_COUNT     1       /* struct: profile tick count buffer */
 229 #define GPROF_FROMS     2       /* struct: from location hash bucket */
 230 #define GPROF_TOS       3       /* struct: destination/count structure */
 231 #define GPROF_GMONPARAM 4       /* struct: profiling parameters (see above) */
 232
 233
 234 /*
 235  * Declarations for various profiling related functions from
 236  * bsd/kern/subr_prof.c
 237  */
 238 #ifdef GPROF
 239 #ifdef XNU_KERNEL_PRIVATE
 240
 241 void kmstartup(void);
 242 void cfreemem(caddr_t, int);  /* Currently only a stub function. */
 243 void mcount(u_long, u_long);
 244
 245 #endif /* XNU_KERNEL_PRIVATE */
 246 #endif /* GPROF */
 247
 248
 249 /*
 250  * In order to support more information than in the original mon.out and
 251  * gmon.out files there is an alternate gmon.out file format.  The alternate
 252  * gmon.out file format starts with a magic number then separates the
 253  * information with gmon_data_t's.
 254  */
 255 #define GMON_MAGIC 0xbeefbabe
 256 #define GMON_MAGIC_64 0xbeefbabf
 257 typedef struct gmon_data {
 258     uint32_t type; /* constant for type of data following this struct */
 259     uint32_t size; /* size in bytes of the data following this struct */
 260 } gmon_data_t;
 261
 262 /*
 263  * The GMONTYPE_SAMPLES gmon_data.type is for the histogram counters described
 264  * above and has a gmonhdr_t followed by the counters.
 265  */
 266 #define GMONTYPE_SAMPLES        1
 267 /*
 268  * The GMONTYPE_RAWARCS gmon_data.type is for the raw arcs described above.
 269  */
 270 #define GMONTYPE_RAWARCS        2
 271 /*
 272  * The GMONTYPE_ARCS_ORDERS gmon_data.type is for the raw arcs with a call
 273  * order field.  The order is the order is a sequence number for the order each
 274  * call site was executed.  Raw_order values start at 1 not zero.  Other than
 275  * the raw_order field this is the same information as in the rawarc_t.
 276  */
 277 #define GMONTYPE_ARCS_ORDERS    3
 278 struct rawarc_order {
 279     uint32_t    raw_frompc;
 280     uint32_t    raw_selfpc;
 281     uint32_t    raw_count;
 282     uint32_t    raw_order;
 283
 284 }; struct rawarc_order_64 {
 285     uint64_t    raw_frompc;
 286     uint64_t    raw_selfpc;
 287     uint32_t    raw_count;
 288     uint32_t    raw_order;
 289 };
 290
 291 typedef struct
 292 #ifndef __LP64__
 293         rawarc_order
 294 #else
 295         rawarc_order_64
 296 #endif
 297 rawarc_order_t;
 298
 299 /*
 300  * The GMONTYPE_DYLD_STATE gmon_data.type is for the dynamic link editor state
 301  * of the program.
 302  * The informations starts with an uint32_t with the count of states:
 303  *      image_count
 304  * Then each state follows in the file.  The state is made up of
 305  *      vmaddr_slide (the amount dyld slid this image from it's vmaddress)
 306  *      name (the file name dyld loaded this image from)
 307  * The vmaddr_slide is a 32-bit value for 32-bit programs and 64-bit value for
 308  * 64-bit programs.
 309  */
 310 #define GMONTYPE_DYLD_STATE     4
 311
 312 /*
 313  * The GMONTYPE_DYLD2_STATE gmon_data.type is for the dynamic link editor state
 314  * of the program.
 315  * The informations starts with an uint32_t with the count of states:
 316  *      image_count
 317  * Then each state follows in the file.  The state is made up of
 318  *      image_header (the address where dyld loaded this image)
 319  *      name (the file name dyld loaded this image from)
 320  * The image_header is a 32-bit value for 32-bit programs and 64-bit value for
 321  * 64-bit programs.
 322  */
 323 #define GMONTYPE_DYLD2_STATE     5
 324
 325 #endif /* !_SYS_GMON_H_ */