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29 * @(#)gmon.c 8.1 (Berkeley) 6/4/93
30 * $FreeBSD: src/lib/libc/gmon/gmon.c,v 1.22 2007/01/09 00:27:58 imp Exp $
31 * $DragonFly: src/lib/libc/gmon/gmon.c,v 1.8 2005/11/13 01:18:20 swildner Exp $
34 #include "namespace.h"
35 #include <sys/param.h>
38 #include <sys/sysctl.h>
46 #include "un-namespace.h"
48 #include "libc_private.h"
50 #if defined(__i386__) || defined(__sparc64__) || defined(__amd64__) || defined(__powerpc__)
51 extern char *minbrk __asm (".minbrk");
53 extern char *minbrk __asm ("minbrk");
56 struct gmonparam _gmonparam = { GMON_PROF_OFF };
59 /* see profil(2) where this is describe (incorrectly) */
60 #define SCALE_1_TO_1 0x10000L
62 #define ERR(s) _write(2, s, sizeof(s))
65 static int hertz(void);
68 monstartup(u_long lowpc, u_long highpc)
72 struct gmonparam *p = &_gmonparam;
75 * round lowpc and highpc to multiples of the density we're using
76 * so the rest of the scaling (here and in gprof) stays in ints.
78 p->lowpc = ROUNDDOWN(lowpc, HISTFRACTION * sizeof(HISTCOUNTER));
79 p->highpc = ROUNDUP(highpc, HISTFRACTION * sizeof(HISTCOUNTER));
80 p->textsize = p->highpc - p->lowpc;
81 p->kcountsize = p->textsize / HISTFRACTION;
82 p->hashfraction = HASHFRACTION;
83 p->fromssize = p->textsize / HASHFRACTION;
84 p->tolimit = p->textsize * ARCDENSITY / 100;
85 if (p->tolimit < MINARCS)
87 else if (p->tolimit > MAXARCS)
89 p->tossize = p->tolimit * sizeof(struct tostruct);
91 cp = sbrk(p->kcountsize + p->fromssize + p->tossize);
92 if (cp == (char *)-1) {
93 ERR("monstartup: out of memory\n");
97 bzero(cp, p->kcountsize + p->fromssize + p->tossize);
99 p->tos = (struct tostruct *)cp;
101 p->kcount = (u_short *)cp;
103 p->froms = (u_short *)cp;
108 o = p->highpc - p->lowpc;
109 if (p->kcountsize < o) {
111 s_scale = ((float)p->kcountsize / o ) * SCALE_1_TO_1;
112 #else /* avoid floating point */
113 int quot = o / p->kcountsize;
117 else if (quot >= 0x100)
118 s_scale = 0x10000 / quot;
119 else if (o >= 0x800000)
120 s_scale = 0x1000000 / (o / (p->kcountsize >> 8));
122 s_scale = 0x1000000 / ((o << 8) / p->kcountsize);
125 s_scale = SCALE_1_TO_1;
138 struct rawarc rawarc;
139 struct gmonparam *p = &_gmonparam;
140 struct gmonhdr gmonhdr, *hdr;
141 struct clockinfo clockinfo;
150 if (p->state == GMON_PROF_ERROR)
151 ERR("_mcleanup: tos overflow\n");
153 size = sizeof(clockinfo);
155 mib[1] = KERN_CLOCKRATE;
156 if (sysctl(mib, 2, &clockinfo, &size, NULL, 0) < 0) {
160 clockinfo.profhz = hertz();
161 } else if (clockinfo.profhz == 0) {
162 if (clockinfo.hz != 0)
163 clockinfo.profhz = clockinfo.hz;
165 clockinfo.profhz = hertz();
169 snprintf(outname, sizeof(outname), "%s.gmon", _getprogname());
170 fd = _open(outname, O_CREAT|O_TRUNC|O_WRONLY, 0666);
172 _warn("_mcleanup: %s", outname);
176 log = _open("gmon.log", O_CREAT|O_TRUNC|O_WRONLY, 0664);
178 _warn("_mcleanup: gmon.log");
181 len = sprintf(buf, "[mcleanup1] kcount 0x%p ssiz %lu\n",
182 p->kcount, p->kcountsize);
183 _write(log, buf, len);
185 hdr = (struct gmonhdr *)&gmonhdr;
186 bzero(hdr, sizeof(*hdr));
188 hdr->hpc = p->highpc;
189 hdr->ncnt = p->kcountsize + sizeof(gmonhdr);
190 hdr->version = GMONVERSION;
191 hdr->profrate = clockinfo.profhz;
192 _write(fd, (char *)hdr, sizeof *hdr);
193 _write(fd, p->kcount, p->kcountsize);
194 endfrom = p->fromssize / sizeof(*p->froms);
195 for (fromindex = 0; fromindex < endfrom; fromindex++) {
196 if (p->froms[fromindex] == 0)
200 frompc += fromindex * p->hashfraction * sizeof(*p->froms);
201 for (toindex = p->froms[fromindex]; toindex != 0;
202 toindex = p->tos[toindex].link) {
205 "[mcleanup2] frompc 0x%lx selfpc 0x%lx count %lu\n" ,
206 frompc, p->tos[toindex].selfpc,
207 p->tos[toindex].count);
208 _write(log, buf, len);
210 rawarc.raw_frompc = frompc;
211 rawarc.raw_selfpc = p->tos[toindex].selfpc;
212 rawarc.raw_count = p->tos[toindex].count;
213 _write(fd, &rawarc, sizeof rawarc);
221 * profiling is what mcount checks to see if
222 * all the data structures are ready.
227 struct gmonparam *p = &_gmonparam;
231 profil((char *)p->kcount, p->kcountsize, p->lowpc, s_scale);
232 p->state = GMON_PROF_ON;
235 profil(NULL, 0, 0, 0);
236 p->state = GMON_PROF_OFF;
241 * discover the tick frequency of the machine
242 * if something goes wrong, we return 0, an impossible hertz.
247 struct itimerval tim;
249 tim.it_interval.tv_sec = 0;
250 tim.it_interval.tv_usec = 1;
251 tim.it_value.tv_sec = 0;
252 tim.it_value.tv_usec = 0;
253 setitimer(ITIMER_REAL, &tim, 0);
254 setitimer(ITIMER_REAL, 0, &tim);
255 if (tim.it_interval.tv_usec < 2)
257 return (1000000 / tim.it_interval.tv_usec);