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[/] [openrisc/] [trunk/] [gnu-old/] [gcc-4.2.2/] [gcc/] [config/] [sparc/] [gmon-sol2.c] - Rev 856
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/*- * Copyright (c) 1991 The Regents of the University of California. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. [rescinded 22 July 1999] * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ /* Mangled into a form that works on SPARC Solaris 2 by Mark Eichin * for Cygnus Support, July 1992. */ #include "tconfig.h" #include "tsystem.h" #include <fcntl.h> /* for creat() */ #include "coretypes.h" #include "tm.h" #if 0 #include "sparc/gmon.h" #else struct phdr { char *lpc; char *hpc; int ncnt; }; #define HISTFRACTION 2 #define HISTCOUNTER unsigned short #define HASHFRACTION 1 #define ARCDENSITY 2 #define MINARCS 50 struct tostruct { char *selfpc; long count; unsigned short link; }; struct rawarc { unsigned long raw_frompc; unsigned long raw_selfpc; long raw_count; }; #define ROUNDDOWN(x,y) (((x)/(y))*(y)) #define ROUNDUP(x,y) ((((x)+(y)-1)/(y))*(y)) #endif /* extern mcount() asm ("mcount"); */ /*extern*/ char *minbrk /* asm ("minbrk") */; /* * froms is actually a bunch of unsigned shorts indexing tos */ static int profiling = 3; static unsigned short *froms; static struct tostruct *tos = 0; static long tolimit = 0; static char *s_lowpc = 0; static char *s_highpc = 0; static unsigned long s_textsize = 0; static int ssiz; static char *sbuf; static int s_scale; /* see profil(2) where this is describe (incorrectly) */ #define SCALE_1_TO_1 0x10000L #define MSG "No space for profiling buffer(s)\n" static void moncontrol (int); extern void monstartup (char *, char *); extern void _mcleanup (void); void monstartup(char *lowpc, char *highpc) { int monsize; char *buffer; register int o; /* * round lowpc and highpc to multiples of the density we're using * so the rest of the scaling (here and in gprof) stays in ints. */ lowpc = (char *) ROUNDDOWN((unsigned long)lowpc, HISTFRACTION*sizeof(HISTCOUNTER)); s_lowpc = lowpc; highpc = (char *) ROUNDUP((unsigned long)highpc, HISTFRACTION*sizeof(HISTCOUNTER)); s_highpc = highpc; s_textsize = highpc - lowpc; monsize = (s_textsize / HISTFRACTION) + sizeof(struct phdr); buffer = sbrk( monsize ); if ( buffer == (char *) -1 ) { write( 2 , MSG , sizeof(MSG) ); return; } froms = (unsigned short *) sbrk( s_textsize / HASHFRACTION ); if ( froms == (unsigned short *) -1 ) { write( 2 , MSG , sizeof(MSG) ); froms = 0; return; } tolimit = s_textsize * ARCDENSITY / 100; if ( tolimit < MINARCS ) { tolimit = MINARCS; } else if ( tolimit > 65534 ) { tolimit = 65534; } tos = (struct tostruct *) sbrk( tolimit * sizeof( struct tostruct ) ); if ( tos == (struct tostruct *) -1 ) { write( 2 , MSG , sizeof(MSG) ); froms = 0; tos = 0; return; } minbrk = sbrk(0); tos[0].link = 0; sbuf = buffer; ssiz = monsize; ( (struct phdr *) buffer ) -> lpc = lowpc; ( (struct phdr *) buffer ) -> hpc = highpc; ( (struct phdr *) buffer ) -> ncnt = ssiz; monsize -= sizeof(struct phdr); if ( monsize <= 0 ) return; o = highpc - lowpc; if( monsize < o ) #ifndef hp300 s_scale = ( (float) monsize / o ) * SCALE_1_TO_1; #else /* avoid floating point */ { int quot = o / monsize; if (quot >= 0x10000) s_scale = 1; else if (quot >= 0x100) s_scale = 0x10000 / quot; else if (o >= 0x800000) s_scale = 0x1000000 / (o / (monsize >> 8)); else s_scale = 0x1000000 / ((o << 8) / monsize); } #endif else s_scale = SCALE_1_TO_1; moncontrol(1); } void _mcleanup(void) { int fd; int fromindex; int endfrom; char *frompc; int toindex; struct rawarc rawarc; char *profdir; const char *proffile; char *progname; char buf[PATH_MAX]; extern char **___Argv; moncontrol(0); if ((profdir = getenv("PROFDIR")) != NULL) { /* If PROFDIR contains a null value, no profiling output is produced */ if (*profdir == '\0') { return; } progname=strrchr(___Argv[0], '/'); if (progname == NULL) progname=___Argv[0]; else progname++; sprintf(buf, "%s/%ld.%s", profdir, (long) getpid(), progname); proffile = buf; } else { proffile = "gmon.out"; } fd = creat( proffile, 0666 ); if ( fd < 0 ) { perror( proffile ); return; } # ifdef DEBUG fprintf( stderr , "[mcleanup] sbuf 0x%x ssiz %d\n" , sbuf , ssiz ); # endif /* DEBUG */ write( fd , sbuf , ssiz ); endfrom = s_textsize / (HASHFRACTION * sizeof(*froms)); for ( fromindex = 0 ; fromindex < endfrom ; fromindex++ ) { if ( froms[fromindex] == 0 ) { continue; } frompc = s_lowpc + (fromindex * HASHFRACTION * sizeof(*froms)); for (toindex=froms[fromindex]; toindex!=0; toindex=tos[toindex].link) { # ifdef DEBUG fprintf( stderr , "[mcleanup] frompc 0x%x selfpc 0x%x count %d\n" , frompc , tos[toindex].selfpc , tos[toindex].count ); # endif /* DEBUG */ rawarc.raw_frompc = (unsigned long) frompc; rawarc.raw_selfpc = (unsigned long) tos[toindex].selfpc; rawarc.raw_count = tos[toindex].count; write( fd , &rawarc , sizeof rawarc ); } } close( fd ); } /* * The SPARC stack frame is only held together by the frame pointers * in the register windows. According to the SVR4 SPARC ABI * Supplement, Low Level System Information/Operating System * Interface/Software Trap Types, a type 3 trap will flush all of the * register windows to the stack, which will make it possible to walk * the frames and find the return addresses. * However, it seems awfully expensive to incur a trap (system * call) for every function call. It turns out that "call" simply puts * the return address in %o7 expecting the "save" in the procedure to * shift it into %i7; this means that before the "save" occurs, %o7 * contains the address of the call to mcount, and %i7 still contains * the caller above that. The asm mcount here simply saves those * registers in argument registers and branches to internal_mcount, * simulating a call with arguments. * Kludges: * 1) the branch to internal_mcount is hard coded; it should be * possible to tell asm to use the assembler-name of a symbol. * 2) in theory, the function calling mcount could have saved %i7 * somewhere and reused the register; in practice, I *think* this will * break longjmp (and maybe the debugger) but I'm not certain. (I take * some comfort in the knowledge that it will break the native mcount * as well.) * 3) if builtin_return_address worked, this could be portable. * However, it would really have to be optimized for arguments of 0 * and 1 and do something like what we have here in order to avoid the * trap per function call performance hit. * 4) the atexit and monsetup calls prevent this from simply * being a leaf routine that doesn't do a "save" (and would thus have * access to %o7 and %i7 directly) but the call to write() at the end * would have also prevented this. * * -- [eichin:19920702.1107EST] */ static void internal_mcount (char *, unsigned short *) __attribute__ ((used)); /* i7 == last ret, -> frompcindex */ /* o7 == current ret, -> selfpc */ /* Solaris 2 libraries use _mcount. */ asm(".global _mcount; _mcount: mov %i7,%o1; mov %o7,%o0;b,a internal_mcount"); /* This is for compatibility with old versions of gcc which used mcount. */ asm(".global mcount; mcount: mov %i7,%o1; mov %o7,%o0;b,a internal_mcount"); static void internal_mcount(char *selfpc, unsigned short *frompcindex) { register struct tostruct *top; register struct tostruct *prevtop; register long toindex; static char already_setup; /* * find the return address for mcount, * and the return address for mcount's caller. */ if(!already_setup) { extern char etext[]; extern char _start[]; extern char _init[]; already_setup = 1; monstartup(_start < _init ? _start : _init, etext); #ifdef USE_ONEXIT on_exit(_mcleanup, 0); #else atexit(_mcleanup); #endif } /* * check that we are profiling * and that we aren't recursively invoked. */ if (profiling) { goto out; } profiling++; /* * check that frompcindex is a reasonable pc value. * for example: signal catchers get called from the stack, * not from text space. too bad. */ frompcindex = (unsigned short *)((long)frompcindex - (long)s_lowpc); if ((unsigned long)frompcindex > s_textsize) { goto done; } frompcindex = &froms[((long)frompcindex) / (HASHFRACTION * sizeof(*froms))]; toindex = *frompcindex; if (toindex == 0) { /* * first time traversing this arc */ toindex = ++tos[0].link; if (toindex >= tolimit) { goto overflow; } *frompcindex = toindex; top = &tos[toindex]; top->selfpc = selfpc; top->count = 1; top->link = 0; goto done; } top = &tos[toindex]; if (top->selfpc == selfpc) { /* * arc at front of chain; usual case. */ top->count++; goto done; } /* * have to go looking down chain for it. * top points to what we are looking at, * prevtop points to previous top. * we know it is not at the head of the chain. */ for (; /* goto done */; ) { if (top->link == 0) { /* * top is end of the chain and none of the chain * had top->selfpc == selfpc. * so we allocate a new tostruct * and link it to the head of the chain. */ toindex = ++tos[0].link; if (toindex >= tolimit) { goto overflow; } top = &tos[toindex]; top->selfpc = selfpc; top->count = 1; top->link = *frompcindex; *frompcindex = toindex; goto done; } /* * otherwise, check the next arc on the chain. */ prevtop = top; top = &tos[top->link]; if (top->selfpc == selfpc) { /* * there it is. * increment its count * move it to the head of the chain. */ top->count++; toindex = prevtop->link; prevtop->link = top->link; top->link = *frompcindex; *frompcindex = toindex; goto done; } } done: profiling--; /* and fall through */ out: return; /* normal return restores saved registers */ overflow: profiling++; /* halt further profiling */ # define TOLIMIT "mcount: tos overflow\n" write(2, TOLIMIT, sizeof(TOLIMIT)); goto out; } /* * Control profiling * profiling is what mcount checks to see if * all the data structures are ready. */ static void moncontrol(int mode) { if (mode) { /* start */ profil((unsigned short *)(sbuf + sizeof(struct phdr)), ssiz - sizeof(struct phdr), (long)s_lowpc, s_scale); profiling = 0; } else { /* stop */ profil((unsigned short *)0, 0, 0, 0); profiling = 3; } }
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