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Diffstat (limited to 'libraries/libprof/gmon.c')
| -rw-r--r-- | libraries/libprof/gmon.c | 323 |
1 files changed, 323 insertions, 0 deletions
diff --git a/libraries/libprof/gmon.c b/libraries/libprof/gmon.c new file mode 100644 index 0000000..92054fc --- /dev/null +++ b/libraries/libprof/gmon.c @@ -0,0 +1,323 @@ +/*- + * Copyright (c) 1983, 1992, 1993 + * 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. + * 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. + */ + +/* + * This file is taken from Cygwin distribution. Please keep it in sync. + * The differences should be within __MINGW32__ guard. + */ + +#include <fcntl.h> +#include <stdlib.h> +#include <stdio.h> +#include <unistd.h> +#include "gmon.h" +#include "profil.h" +#include <string.h> + +#define bzero(ptr,size) memset (ptr, 0, size); +#define ERR(s) write(2, s, sizeof(s)) + +struct gmonparam _gmonparam = { GMON_PROF_OFF, NULL, 0, NULL, 0, NULL, 0, 0L, 0, 0, 0}; +static char already_setup = 0; /* flag to indicate if we need to init */ +static int s_scale; +/* see profil(2) where this is described (incorrectly) */ +#define SCALE_1_TO_1 0x10000L + +static void moncontrol(int mode); + +void monstartup (size_t lowpc, size_t highpc) { + register size_t o; + char *cp; + struct gmonparam *p = &_gmonparam; + + if (already_setup) { + /* zero out cp as value will be added there */ + bzero(p->tos, p->kcountsize + p->fromssize + p->tossize); + moncontrol(1); /* start */ + return; + } + already_setup = 1; + + /* enable semihosting, for eventual output */ + extern void initialise_monitor_handles(void); + initialise_monitor_handles(); + + /* + * 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. + */ + p->lowpc = ROUNDDOWN(lowpc, HISTFRACTION * sizeof(HISTCOUNTER)); + p->highpc = ROUNDUP(highpc, HISTFRACTION * sizeof(HISTCOUNTER)); + p->textsize = p->highpc - p->lowpc + 0x20; + p->kcountsize = p->textsize / HISTFRACTION; + p->fromssize = p->textsize / HASHFRACTION; + p->tolimit = p->textsize * ARCDENSITY / 100; + if (p->tolimit < MINARCS) { + p->tolimit = MINARCS; + } else if (p->tolimit > MAXARCS) { + p->tolimit = MAXARCS; + } + p->tossize = p->tolimit * sizeof(struct tostruct); + + extern void *hal_allocate_static_memory(const size_t size); + cp = hal_allocate_static_memory(p->kcountsize + p->fromssize + p->tossize); + if (cp == NULL) { + ERR("monstartup: out of memory\n"); + return; + } + + /* zero out cp as value will be added there */ + bzero(cp, p->kcountsize + p->fromssize + p->tossize); + + p->tos = (struct tostruct *)cp; + cp += p->tossize; + p->kcount = (unsigned short *)cp; + cp += p->kcountsize; + p->froms = (unsigned short *)cp; + + p->tos[0].link = 0; + + o = p->highpc - p->lowpc; + if (p->kcountsize < o) { +#ifndef notdef + s_scale = ((float)p->kcountsize / o ) * SCALE_1_TO_1; +#else /* avoid floating point */ + int quot = o / p->kcountsize; + + if (quot >= 0x10000) + s_scale = 1; + else if (quot >= 0x100) + s_scale = 0x10000 / quot; + else if (o >= 0x800000) + s_scale = 0x1000000 / (o / (p->kcountsize >> 8)); + else + s_scale = 0x1000000 / ((o << 8) / p->kcountsize); +#endif + } else { + s_scale = SCALE_1_TO_1; + } + moncontrol(1); /* start */ +} + +void _mcleanup(void) { + static const char gmon_out[] = "gmon.out"; + int fd; + int fromindex; + int endfrom; + size_t frompc; + int toindex; + struct rawarc rawarc; + struct gmonparam *p = &_gmonparam; + struct gmonhdr gmonhdr = {0}, *hdr; + const char *proffile; +#ifdef DEBUG + int log, len; + char dbuf[200]; +#endif + + if (p->state == GMON_PROF_ERROR) { + ERR("_mcleanup: tos overflow\n"); + } + moncontrol(0); /* stop */ + proffile = gmon_out; + fd = open(proffile , O_CREAT|O_TRUNC|O_WRONLY|O_BINARY, 0666); + if (fd < 0) { + perror( proffile ); + return; + } +#ifdef DEBUG + log = open("gmon.log", O_CREAT|O_TRUNC|O_WRONLY, 0664); + if (log < 0) { + perror("mcount: gmon.log"); + return; + } + len = sprintf(dbuf, "[mcleanup1] kcount 0x%x ssiz %d\n", + (unsigned int)p->kcount, p->kcountsize); + write(log, dbuf, len); +#endif + hdr = (struct gmonhdr *)&gmonhdr; + hdr->lpc = p->lowpc; + hdr->hpc = p->highpc; + hdr->ncnt = p->kcountsize + sizeof(gmonhdr); + hdr->version = GMONVERSION; + hdr->profrate = PROF_HZ; + hdr->spare[0] = hdr->spare[1] = hdr->spare[2] = 0; + write(fd, (char *)hdr, sizeof *hdr); + write(fd, p->kcount, p->kcountsize); + endfrom = p->fromssize / sizeof(*p->froms); + for (fromindex = 0; fromindex < endfrom; fromindex++) { + if (p->froms[fromindex] == 0) { + continue; + } + frompc = p->lowpc; + frompc += fromindex * HASHFRACTION * sizeof(*p->froms); + for (toindex = p->froms[fromindex]; toindex != 0; toindex = p->tos[toindex].link) { +#ifdef DEBUG + len = sprintf(dbuf, + "[mcleanup2] frompc 0x%x selfpc 0x%x count %ld\n" , + frompc, p->tos[toindex].selfpc, + p->tos[toindex].count); + write(log, dbuf, len); +#endif + rawarc.raw_frompc = frompc; + rawarc.raw_selfpc = p->tos[toindex].selfpc; + rawarc.raw_count = p->tos[toindex].count; + write(fd, &rawarc, sizeof rawarc); + } + } + close(fd); +} + +/* + * Control profiling + * profiling is what mcount checks to see if + * all the data structures are ready. + */ +static void moncontrol(int mode) { + struct gmonparam *p = &_gmonparam; + + if (mode) { + /* start */ + profil((char *)p->kcount, p->kcountsize, p->lowpc, s_scale); + p->state = GMON_PROF_ON; + } else { + /* stop */ + profil((char *)0, 0, 0, 0); + p->state = GMON_PROF_OFF; + } +} + +void _mcount_internal(uint32_t *frompcindex, uint32_t *selfpc) { + register struct tostruct *top; + register struct tostruct *prevtop; + register long toindex; + struct gmonparam *p = &_gmonparam; + + /* + * check that we are profiling + * and that we aren't recursively invoked. + */ + if (p->state!=GMON_PROF_ON) { + goto out; + } + p->state++; + /* + * check that frompcindex is a reasonable pc value. + * for example: signal catchers get called from the stack, + * not from text space. too bad. + */ + frompcindex = (uint32_t*)((long)frompcindex - (long)p->lowpc); + if ((unsigned long)frompcindex > p->textsize) { + goto done; + } + frompcindex = (uint32_t*)&p->froms[((long)frompcindex) / (HASHFRACTION * sizeof(*p->froms))]; + toindex = *((unsigned short*)frompcindex); /* get froms[] value */ + if (toindex == 0) { + /* + * first time traversing this arc + */ + toindex = ++p->tos[0].link; /* the link of tos[0] points to the last used record in the array */ + if (toindex >= p->tolimit) { /* more tos[] entries than we can handle! */ + goto overflow; + } + *((unsigned short*)frompcindex) = (unsigned short)toindex; /* store new 'to' value into froms[] */ + top = &p->tos[toindex]; + top->selfpc = (size_t)selfpc; + top->count = 1; + top->link = 0; + goto done; + } + top = &p->tos[toindex]; + if (top->selfpc == (size_t)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 = ++p->tos[0].link; + if (toindex >= p->tolimit) { + goto overflow; + } + top = &p->tos[toindex]; + top->selfpc = (size_t)selfpc; + top->count = 1; + top->link = *((unsigned short*)frompcindex); + *(unsigned short*)frompcindex = (unsigned short)toindex; + goto done; + } + /* + * otherwise, check the next arc on the chain. + */ + prevtop = top; + top = &p->tos[top->link]; + if (top->selfpc == (size_t)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 = *((unsigned short*)frompcindex); + *((unsigned short*)frompcindex) = (unsigned short)toindex; + goto done; + } + } + done: + p->state--; + /* and fall through */ + out: + return; /* normal return restores saved registers */ + overflow: + p->state++; /* halt further profiling */ + #define TOLIMIT "mcount: tos overflow\n" + write (2, TOLIMIT, sizeof(TOLIMIT)); + goto out; +} + +void _monInit(void) { + _gmonparam.state = GMON_PROF_OFF; + already_setup = 0; +} |