gcc/config/i386/gmon-sol2.c

   1 /*-
   2  * Copyright (c) 1991 The Regents of the University of California.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. [rescinded 22 July 1999]
  14  * 4. Neither the name of the University nor the names of its contributors
  15  *    may be used to endorse or promote products derived from this software
  16  *    without specific prior written permission.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  19  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  21  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  22  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  24  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  28  * SUCH DAMAGE.
  29  */
  30
  31 /*
  32  * This is a modified gmon.c by J.W.Hawtin <oolon@ankh.org>,
  33  * 14/8/96 based on the original gmon.c in GCC and the hacked version
  34  * solaris 2 sparc version (config/sparc/gmon-sol.c) by Mark Eichin. To do
  35  * process profiling on solaris 2.X X86
  36  *
  37  * It must be used in conjunction with sol2-gc1.asm, which is used to start
  38  * and stop process monitoring.
  39  *
  40  * Differences.
  41  *
  42  * On Solaris 2 _mcount is called by library functions not mcount, so support
  43  * has been added for both.
  44  *
  45  * Also the prototype for profil() is different
  46  *
  47  * Solaris 2 does not seem to have char *minbrk whcih allows the setting of
  48  * the minimum SBRK region so this code has been removed and lets pray malloc
  49  * does not mess it up.
  50  *
  51  * Notes
  52  *
  53  * This code could easily be integrated with the original gmon.c and perhaps
  54  * should be.
  55  */
  56
  57 #ifndef lint
  58 static char sccsid[] = "@(#)gmon.c      5.3 (Berkeley) 5/22/91";
  59 #endif /* not lint */
  60
  61 #if 0
  62 #include <unistd.h>
  63
  64 #endif
  65 #ifdef DEBUG
  66 #include <stdio.h>
  67 #endif
  68
  69 #if 0
  70 #include "i386/gmon.h"
  71 #else
  72
  73 struct phdr {
  74                 char    *lpc;
  75                 char    *hpc;
  76                 int     ncnt;
  77 };
  78
  79
  80 #define HISTFRACTION 2
  81 #define HISTCOUNTER unsigned short
  82 #define HASHFRACTION 1
  83 #define ARCDENSITY 2
  84 #define MINARCS 50
  85 #define BASEADDRESS 0x8000000 /* On Solaris 2 X86 all executables start here
  86                                  and not at 0 */
  87
  88 struct tostruct {
  89   char *selfpc;
  90   long count;
  91   unsigned short link;
  92 };
  93 struct rawarc {
  94     unsigned long       raw_frompc;
  95     unsigned long       raw_selfpc;
  96     long                raw_count;
  97 };
  98 #define ROUNDDOWN(x,y)  (((x)/(y))*(y))
  99 #define ROUNDUP(x,y)    ((((x)+(y)-1)/(y))*(y))
 100 #endif
 101
 102 /* char *minbrk; */
 103
 104 #ifdef __alpha
 105 extern char *sbrk ();
 106 #endif
 107
 108     /*
 109      *  froms is actually a bunch of unsigned shorts indexing tos
 110      */
 111 static int              profiling = 3;
 112 static unsigned short   *froms;
 113 static struct tostruct  *tos = 0;
 114 static long             tolimit = 0;
 115 static char             *s_lowpc = 0;
 116 static char             *s_highpc = 0;
 117 static unsigned long    s_textsize = 0;
 118
 119 static int      ssiz;
 120 static char     *sbuf;
 121 static int      s_scale;
 122     /* see profil(2) where this is describe (incorrectly) */
 123 #define         SCALE_1_TO_1    0x10000L
 124
 125 #define MSG "No space for profiling buffer(s)\n"
 126
 127 extern int errno;
 128
 129 monstartup(lowpc, highpc)
 130     char        *lowpc;
 131     char        *highpc;
 132 {
 133     int                 monsize;
 134     char                *buffer;
 135     register int        o;
 136
 137         /*
 138          *      round lowpc and highpc to multiples of the density we're using
 139          *      so the rest of the scaling (here and in gprof) stays in ints.
 140          */
 141     lowpc = (char *)
 142             ROUNDDOWN((unsigned)lowpc, HISTFRACTION*sizeof(HISTCOUNTER));
 143     s_lowpc = lowpc;
 144     highpc = (char *)
 145             ROUNDUP((unsigned)highpc, HISTFRACTION*sizeof(HISTCOUNTER));
 146     s_highpc = highpc;
 147     s_textsize = highpc - lowpc;
 148     monsize = (s_textsize / HISTFRACTION) + sizeof(struct phdr);
 149     buffer = (char *) sbrk( monsize );
 150     if ( buffer == (char *) -1 ) {
 151         write( 2 , MSG , sizeof(MSG) );
 152         return;
 153     }
 154     froms = (unsigned short *) sbrk( s_textsize / HASHFRACTION );
 155     if ( froms == (unsigned short *) -1 ) {
 156         write( 2 , MSG , sizeof(MSG) );
 157         froms = 0;
 158         return;
 159     }
 160     tolimit = s_textsize * ARCDENSITY / 100;
 161     if ( tolimit < MINARCS ) {
 162         tolimit = MINARCS;
 163     } else if ( tolimit > 65534 ) {
 164         tolimit = 65534;
 165     }
 166     tos = (struct tostruct *) sbrk( tolimit * sizeof( struct tostruct ) );
 167     if ( tos == (struct tostruct *) -1 ) {
 168         write( 2 , MSG , sizeof(MSG) );
 169         froms = 0;
 170         tos = 0;
 171         return;
 172     }
 173 /*    minbrk = (char *) sbrk(0);*/
 174     tos[0].link = 0;
 175     sbuf = buffer;
 176     ssiz = monsize;
 177     ( (struct phdr *) buffer ) -> lpc = lowpc;
 178     ( (struct phdr *) buffer ) -> hpc = highpc;
 179     ( (struct phdr *) buffer ) -> ncnt = ssiz;
 180     monsize -= sizeof(struct phdr);
 181     if ( monsize <= 0 )
 182         return;
 183     o = highpc - lowpc;
 184     if( monsize < o )
 185 #ifndef hp300
 186         s_scale = ( (float) monsize / o ) * SCALE_1_TO_1;
 187 #else /* avoid floating point */
 188     {
 189         int quot = o / monsize;
 190
 191         if (quot >= 0x10000)
 192                 s_scale = 1;
 193         else if (quot >= 0x100)
 194                 s_scale = 0x10000 / quot;
 195         else if (o >= 0x800000)
 196                 s_scale = 0x1000000 / (o / (monsize >> 8));
 197         else
 198                 s_scale = 0x1000000 / ((o << 8) / monsize);
 199     }
 200 #endif
 201     else
 202         s_scale = SCALE_1_TO_1;
 203     moncontrol(1);
 204 }
 205
 206 _mcleanup()
 207 {
 208     int                 fd;
 209     int                 fromindex;
 210     int                 endfrom;
 211     char                *frompc;
 212     int                 toindex;
 213     struct rawarc       rawarc;
 214
 215     moncontrol(0);
 216     fd = creat( "gmon.out" , 0666 );
 217     if ( fd < 0 ) {
 218         perror( "mcount: gmon.out" );
 219         return;
 220     }
 221 #   ifdef DEBUG
 222         fprintf( stderr , "[mcleanup] sbuf 0x%x ssiz %d\n" , sbuf , ssiz );
 223 #   endif DEBUG
 224
 225     write( fd , sbuf , ssiz );
 226     endfrom = s_textsize / (HASHFRACTION * sizeof(*froms));
 227     for ( fromindex = 0 ; fromindex < endfrom ; fromindex++ ) {
 228         if ( froms[fromindex] == 0 ) {
 229             continue;
 230         }
 231         frompc = s_lowpc + (fromindex * HASHFRACTION * sizeof(*froms));
 232         for (toindex=froms[fromindex]; toindex!=0; toindex=tos[toindex].link) {
 233 #           ifdef DEBUG
 234                 fprintf( stderr ,
 235                         "[mcleanup] frompc 0x%x selfpc 0x%x count %d\n" ,
 236                         frompc , tos[toindex].selfpc , tos[toindex].count );
 237 #           endif DEBUG
 238             rawarc.raw_frompc = (unsigned long) frompc;
 239             rawarc.raw_selfpc = (unsigned long) tos[toindex].selfpc;
 240             rawarc.raw_count = tos[toindex].count;
 241             write( fd , &rawarc , sizeof rawarc );
 242         }
 243     }
 244     close( fd );
 245 }
 246
 247 /* Solaris 2 libraries use _mcount.  */
 248 asm(".globl _mcount; _mcount: jmp internal_mcount");
 249 /* This is for compatibility with old versions of gcc which used mcount.  */
 250 asm(".globl mcount; mcount: jmp internal_mcount");
 251
 252 internal_mcount()
 253 {
 254         register char                   *selfpc;
 255         register unsigned short         *frompcindex;
 256         register struct tostruct        *top;
 257         register struct tostruct        *prevtop;
 258         register long                   toindex;
 259         static char already_setup;
 260
 261         /*
 262          *      find the return address for mcount,
 263          *      and the return address for mcount's caller.
 264          */
 265
 266         /* selfpc = pc pushed by mcount call.
 267            This identifies the function that was just entered.  */
 268         selfpc = (void *) __builtin_return_address (0);
 269         /* frompcindex = pc in preceding frame.
 270            This identifies the caller of the function just entered.  */
 271         frompcindex = (void *) __builtin_return_address (1);
 272
 273         if(!already_setup) {
 274           extern etext();
 275           already_setup = 1;
 276 /*        monstartup(0, etext); */
 277           monstartup(0x08040000, etext);
 278 #ifdef USE_ONEXIT
 279           on_exit(_mcleanup, 0);
 280 #else
 281           atexit(_mcleanup);
 282 #endif
 283         }
 284         /*
 285          *      check that we are profiling
 286          *      and that we aren't recursively invoked.
 287          */
 288         if (profiling) {
 289                 goto out;
 290         }
 291         profiling++;
 292         /*
 293          *      check that frompcindex is a reasonable pc value.
 294          *      for example:    signal catchers get called from the stack,
 295          *                      not from text space.  too bad.
 296          */
 297         frompcindex = (unsigned short *)((long)frompcindex - (long)s_lowpc);
 298         if ((unsigned long)frompcindex > s_textsize) {
 299                 goto done;
 300         }
 301         frompcindex =
 302             &froms[((long)frompcindex) / (HASHFRACTION * sizeof(*froms))];
 303         toindex = *frompcindex;
 304         if (toindex == 0) {
 305                 /*
 306                  *      first time traversing this arc
 307                  */
 308                 toindex = ++tos[0].link;
 309                 if (toindex >= tolimit) {
 310                         goto overflow;
 311                 }
 312                 *frompcindex = toindex;
 313                 top = &tos[toindex];
 314                 top->selfpc = selfpc;
 315                 top->count = 1;
 316                 top->link = 0;
 317                 goto done;
 318         }
 319         top = &tos[toindex];
 320         if (top->selfpc == selfpc) {
 321                 /*
 322                  *      arc at front of chain; usual case.
 323                  */
 324                 top->count++;
 325                 goto done;
 326         }
 327         /*
 328          *      have to go looking down chain for it.
 329          *      top points to what we are looking at,
 330          *      prevtop points to previous top.
 331          *      we know it is not at the head of the chain.
 332          */
 333         for (; /* goto done */; ) {
 334                 if (top->link == 0) {
 335                         /*
 336                          *      top is end of the chain and none of the chain
 337                          *      had top->selfpc == selfpc.
 338                          *      so we allocate a new tostruct
 339                          *      and link it to the head of the chain.
 340                          */
 341                         toindex = ++tos[0].link;
 342                         if (toindex >= tolimit) {
 343                                 goto overflow;
 344                         }
 345                         top = &tos[toindex];
 346                         top->selfpc = selfpc;
 347                         top->count = 1;
 348                         top->link = *frompcindex;
 349                         *frompcindex = toindex;
 350                         goto done;
 351                 }
 352                 /*
 353                  *      otherwise, check the next arc on the chain.
 354                  */
 355                 prevtop = top;
 356                 top = &tos[top->link];
 357                 if (top->selfpc == selfpc) {
 358                         /*
 359                          *      there it is.
 360                          *      increment its count
 361                          *      move it to the head of the chain.
 362                          */
 363                         top->count++;
 364                         toindex = prevtop->link;
 365                         prevtop->link = top->link;
 366                         top->link = *frompcindex;
 367                         *frompcindex = toindex;
 368                         goto done;
 369                 }
 370
 371         }
 372 done:
 373         profiling--;
 374         /* and fall through */
 375 out:
 376         return;         /* normal return restores saved registers */
 377
 378 overflow:
 379         profiling++; /* halt further profiling */
 380 #   define      TOLIMIT "mcount: tos overflow\n"
 381         write(2, TOLIMIT, sizeof(TOLIMIT));
 382         goto out;
 383 }
 384
 385 /*
 386  * Control profiling
 387  *      profiling is what mcount checks to see if
 388  *      all the data structures are ready.
 389  */
 390 moncontrol(mode)
 391     int mode;
 392 {
 393     if (mode)
 394     {
 395       /* start */
 396       profil((unsigned short *)(sbuf + sizeof(struct phdr)),
 397              ssiz - sizeof(struct phdr),
 398              (int)s_lowpc, s_scale);
 399
 400       profiling = 0;
 401     } else {
 402       /* stop */
 403       profil((unsigned short *)0, 0, 0, 0);
 404       profiling = 3;
 405     }
 406 }