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-rw-r--r--libraries/libprof/gmon.c343
1 files changed, 343 insertions, 0 deletions
diff --git a/libraries/libprof/gmon.c b/libraries/libprof/gmon.c
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+/*-
+ * 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 <stdint.h>
+#include <string.h>
+
+#define MINUS_ONE_P (-1)
+#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);
+
+/* required for gcc ARM Embedded 4.9-2015-q2 */
+#if 0
+void *_sbrk(int incr) {
+ extern char __HeapLimit; /* Defined by the linker */
+ static char *heap_end = 0;
+ char *prev_heap_end;
+
+ if (heap_end==0) {
+ heap_end = &__HeapLimit;
+ }
+ prev_heap_end = heap_end;
+ heap_end += incr;
+ return (void *)prev_heap_end;
+}
+#endif
+
+static void *fake_sbrk(int size) {
+ void *rv = malloc(size);
+ if (rv) {
+ return rv;
+ } else {
+ return (void *) MINUS_ONE_P;
+ }
+}
+
+void monstartup (size_t lowpc, size_t highpc) {
+ register size_t o;
+ char *cp;
+ struct gmonparam *p = &_gmonparam;
+
+ /*
+ * 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;
+ 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);
+
+ cp = fake_sbrk(p->kcountsize + p->fromssize + p->tossize);
+ if (cp == (char *)MINUS_ONE_P) {
+ 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 = (u_short *)cp;
+ cp += p->kcountsize;
+ p->froms = (u_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 hz;
+ int fromindex;
+ int endfrom;
+ size_t frompc;
+ int toindex;
+ struct rawarc rawarc;
+ struct gmonparam *p = &_gmonparam;
+ struct gmonhdr gmonhdr, *hdr;
+ const char *proffile;
+#ifdef DEBUG
+ int log, len;
+ char dbuf[200];
+#endif
+
+ if (p->state == GMON_PROF_ERROR) {
+ ERR("_mcleanup: tos overflow\n");
+ }
+ hz = PROF_HZ;
+ 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",
+ 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 = hz;
+ 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 %d\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;
+
+ if (!already_setup) {
+ extern char __etext; /* end of text/code symbol, defined by linker */
+ already_setup = 1;
+ monstartup(0x410, (uint32_t)&__etext);
+ }
+ /*
+ * 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 = *((u_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;
+ }
+ *((u_short*)frompcindex) = (u_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 = *((u_short*)frompcindex);
+ *(u_short*)frompcindex = (u_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 = *((u_short*)frompcindex);
+ *((u_short*)frompcindex) = (u_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;
+}
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