[unix-history] / sys / kern / subr_mcount.c

/*
 * Copyright (c) 1982, 1986 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 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.
 *
 *	@(#)subr_mcount.c	7.10 (Berkeley) 5/7/91
 */

#ifdef GPROF
#include "gprof.h"
#include "param.h"
#include "systm.h"
#include "malloc.h"

/*
 * Froms is actually a bunch of unsigned shorts indexing tos
 */
int	profiling = 3;
u_short	*froms;
struct	tostruct *tos = 0;
long	tolimit = 0;
char	*s_lowpc = (char *)KERNBASE;
extern	char etext;
char	*s_highpc = &etext;
u_long	s_textsize = 0;
int	ssiz;
u_short	*sbuf;
u_short	*kcount;

kmstartup()
{
	u_long fromssize, tossize;

	/*
	 * 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.
	 */
	s_lowpc = (char *)
	    ROUNDDOWN((unsigned)s_lowpc, HISTFRACTION*sizeof (HISTCOUNTER));
	s_highpc = (char *)
	    ROUNDUP((unsigned)s_highpc, HISTFRACTION*sizeof (HISTCOUNTER));
	s_textsize = s_highpc - s_lowpc;
	printf("Profiling kernel, s_textsize=%d [%x..%x]\n",
		s_textsize, s_lowpc, s_highpc);
	ssiz = (s_textsize / HISTFRACTION) + sizeof (struct phdr);
	sbuf = (u_short *)malloc(ssiz, M_GPROF, M_WAITOK);
	if (sbuf == 0) {
		printf("No space for monitor buffer(s)\n");
		return;
	}
	bzero(sbuf, ssiz);
	fromssize = s_textsize / HASHFRACTION;
	froms = (u_short *)malloc(fromssize, M_GPROF, M_NOWAIT);
	if (froms == 0) {
		printf("No space for monitor buffer(s)\n");
		free(sbuf, M_GPROF);
		sbuf = 0;
		return;
	}
	bzero(froms, fromssize);
	tolimit = s_textsize * ARCDENSITY / 100;
	if (tolimit < MINARCS)
		tolimit = MINARCS;
	else if (tolimit > (0xffff - 1))
		tolimit = 0xffff - 1;
	tossize = tolimit * sizeof (struct tostruct);
	tos = (struct tostruct *)malloc(tossize, M_GPROF, M_WAITOK);
	if (tos == 0) {
		printf("No space for monitor buffer(s)\n");
		free(sbuf, M_GPROF), sbuf = 0;
		free(froms, M_GPROF), froms = 0;
		return;
	}
	bzero(tos, tossize);
	tos[0].link = 0;
	((struct phdr *)sbuf)->lpc = s_lowpc;
	((struct phdr *)sbuf)->hpc = s_highpc;
	((struct phdr *)sbuf)->ncnt = ssiz;
	kcount = (u_short *)(((int)sbuf) + sizeof (struct phdr));
}

mcount()
{
	register char *selfpc;			/* r11 => r5 */
	register u_short *frompcindex;		/* r10 => r4 */
	register struct tostruct *top;		/* r9  => r3 */
	register struct tostruct *prevtop;	/* r8  => r2 */
	register long toindex;			/* r7  => r1 */
	static int s;

	/*
	 * Check that we are profiling.
	 */
	if (profiling)
		goto out;
	/*
	 * Find the return address for mcount,
	 * and the return address for mcount's caller.
	 */
#ifdef lint
	selfpc = (char *)0;
	frompcindex = 0;
#else
	;				/* avoid label botch */
#ifdef __GNUC__
#if defined(vax)
	Fix Me!!
#endif
#if defined(tahoe)
	Fix Me!!
#endif
#if defined(hp300)
	/*
	 * selfpc = pc pushed by mcount jsr,
	 * frompcindex = pc pushed by jsr into self.
	 * In GCC the caller's stack frame has already been built so we
	 * have to chase a6 to find caller's raddr.  This assumes that all
	 * routines we are profiling were built with GCC and that all
	 * profiled routines use link/unlk.
	 */
	asm("movl a6@(4),%0" : "=r" (selfpc));
	asm("movl a6@(0)@(4),%0" : "=r" (frompcindex));
#endif
#if defined(i386)
        /*
         * selfpc = pc pushed by mcount call
         */
        asm("movl 4(%%ebp),%0" : "=r" (selfpc));
        /*
         * frompcindex = pc pushed by jsr into self.
         * in GCC, the caller's stack frame has already been built, so we
         * have to chase the base pointer to find caller's raddr.
         */
        asm("movl (%%ebp),%0" : "=r" (frompcindex));
        frompcindex = ((unsigned short **)frompcindex)[1];
#endif /* i386 */
#else
#if defined(vax)
	asm("	movl (sp), r11");	/* selfpc = ... (jsb frame) */
	asm("	movl 16(fp), r10");	/* frompcindex =     (calls frame) */
#endif
#if defined(i386)
	Fix Me!!
#endif /* i386 */
#if defined(tahoe)
	asm("	movl -8(fp),r12");	/* selfpc = callf frame */
	asm("	movl (fp),r11");
	asm("	movl -8(r11),r11");	/* frompcindex = 1 callf frame back */
#endif
#if defined(hp300)
	Fix Me!!
#endif
#endif /* not __GNUC__ */
#endif /* not lint */
	/*
	 * Insure that we cannot be recursively invoked.
	 * this requires that splhigh() and splx() below
	 * do NOT call mcount!
	 */
#if defined(hp300)
	asm("movw	sr,%0" : "=g" (s));
	asm("movw	#0x2700,sr");
#else
	s = splhigh();
#endif
	/*
	 * Check that frompcindex is a reasonable pc value.
	 * For example:	signal catchers get called from the stack,
	 *	not from text space.  too bad.
	 */
	frompcindex = (u_short *)((u_long)frompcindex - (u_long)s_lowpc);
	if ((u_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 and
			 * 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:
#if defined(hp300)
	asm("movw	%0,sr" : : "g" (s));
#else
	splx(s);
#endif
	/* and fall through */
out:
#if defined(vax)
	asm("	rsb");
#endif
	return;
overflow:
	profiling = 3;
	printf("mcount: tos overflow\n");
	goto out;
}
#endif
Commit	Line	Data
15637ed4 RG	1	/*
	2	* Copyright (c) 1982, 1986 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. All advertising materials mentioning features or use of this software
	14	* must display the following acknowledgement:
	15	* This product includes software developed by the University of
	16	* California, Berkeley and its contributors.
	17	* 4. Neither the name of the University nor the names of its contributors
	18	* may be used to endorse or promote products derived from this software
	19	* without specific prior written permission.
	20	*
	21	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	22	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	23	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	24	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	25	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	26	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	27	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	28	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	29	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	30	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	31	* SUCH DAMAGE.
	32	*
	33	* @(#)subr_mcount.c 7.10 (Berkeley) 5/7/91
	34	*/
	35
	36	#ifdef GPROF
	37	#include "gprof.h"
	38	#include "param.h"
	39	#include "systm.h"
	40	#include "malloc.h"
	41
	42	/*
	43	* Froms is actually a bunch of unsigned shorts indexing tos
	44	*/
	45	int profiling = 3;
	46	u_short *froms;
	47	struct tostruct *tos = 0;
	48	long tolimit = 0;
	49	char s_lowpc = (char )KERNBASE;
	50	extern char etext;
	51	char *s_highpc = &etext;
	52	u_long s_textsize = 0;
	53	int ssiz;
	54	u_short *sbuf;
	55	u_short *kcount;
	56
	57	kmstartup()
	58	{
	59	u_long fromssize, tossize;
	60
	61	/*
	62	* Round lowpc and highpc to multiples of the density we're using
	63	* so the rest of the scaling (here and in gprof) stays in ints.
	64	*/
65	s_lowpc = (char *)
66	ROUNDDOWN((unsigned)s_lowpc, HISTFRACTION*sizeof (HISTCOUNTER));
67	s_highpc = (char *)
68	ROUNDUP((unsigned)s_highpc, HISTFRACTION*sizeof (HISTCOUNTER));
69	s_textsize = s_highpc - s_lowpc;
70	printf("Profiling kernel, s_textsize=%d [%x..%x]\n",
71	s_textsize, s_lowpc, s_highpc);
72	ssiz = (s_textsize / HISTFRACTION) + sizeof (struct phdr);
73	sbuf = (u_short *)malloc(ssiz, M_GPROF, M_WAITOK);
74	if (sbuf == 0) {
75	printf("No space for monitor buffer(s)\n");
76	return;
77	}
78	bzero(sbuf, ssiz);
79	fromssize = s_textsize / HASHFRACTION;
80	froms = (u_short *)malloc(fromssize, M_GPROF, M_NOWAIT);
81	if (froms == 0) {
82	printf("No space for monitor buffer(s)\n");
83	free(sbuf, M_GPROF);
84	sbuf = 0;
85	return;
86	}
87	bzero(froms, fromssize);
88	tolimit = s_textsize * ARCDENSITY / 100;
89	if (tolimit < MINARCS)
90	tolimit = MINARCS;
91	else if (tolimit > (0xffff - 1))
92	tolimit = 0xffff - 1;
93	tossize = tolimit * sizeof (struct tostruct);
94	tos = (struct tostruct *)malloc(tossize, M_GPROF, M_WAITOK);
95	if (tos == 0) {
96	printf("No space for monitor buffer(s)\n");
97	free(sbuf, M_GPROF), sbuf = 0;
98	free(froms, M_GPROF), froms = 0;
99	return;
100	}
101	bzero(tos, tossize);
102	tos[0].link = 0;
103	((struct phdr *)sbuf)->lpc = s_lowpc;
104	((struct phdr *)sbuf)->hpc = s_highpc;
105	((struct phdr *)sbuf)->ncnt = ssiz;
106	kcount = (u_short *)(((int)sbuf) + sizeof (struct phdr));
107	}
108
109	mcount()
110	{
111	register char selfpc; / r11 => r5 */
112	register u_short frompcindex; / r10 => r4 */
113	register struct tostruct top; / r9 => r3 */
114	register struct tostruct prevtop; / r8 => r2 */
115	register long toindex; /* r7 => r1 */
116	static int s;
117
118	/*
119	* Check that we are profiling.
120	*/
121	if (profiling)
122	goto out;
123	/*
124	* Find the return address for mcount,
125	* and the return address for mcount's caller.
126	*/
127	#ifdef lint
128	selfpc = (char *)0;
129	frompcindex = 0;
130	#else
131	; /* avoid label botch */
132	#ifdef __GNUC__
133	#if defined(vax)
134	Fix Me!!
135	#endif
136	#if defined(tahoe)
137	Fix Me!!
138	#endif
139	#if defined(hp300)
140	/*
141	* selfpc = pc pushed by mcount jsr,
142	* frompcindex = pc pushed by jsr into self.
143	* In GCC the caller's stack frame has already been built so we
144	* have to chase a6 to find caller's raddr. This assumes that all
145	* routines we are profiling were built with GCC and that all
146	* profiled routines use link/unlk.
147	*/
148	asm("movl a6@(4),%0" : "=r" (selfpc));
149	asm("movl a6@(0)@(4),%0" : "=r" (frompcindex));
150	#endif
dd18dc33 DG	151	#if defined(i386)
	152	/*
	153	* selfpc = pc pushed by mcount call
	154	*/
	155	asm("movl 4(%%ebp),%0" : "=r" (selfpc));
	156	/*
	157	* frompcindex = pc pushed by jsr into self.
	158	* in GCC, the caller's stack frame has already been built, so we
	159	* have to chase the base pointer to find caller's raddr.
	160	*/
	161	asm("movl (%%ebp),%0" : "=r" (frompcindex));
	162	frompcindex = ((unsigned short **)frompcindex)[1];
	163	#endif /* i386 */
15637ed4 RG	164	#else
	165	#if defined(vax)
	166	asm(" movl (sp), r11"); /* selfpc = ... (jsb frame) */
	167	asm(" movl 16(fp), r10"); /* frompcindex = (calls frame) */
	168	#endif
	169	#if defined(i386)
dd18dc33	170	Fix Me!!
15637ed4 RG	171	#endif /* i386 */
	172	#if defined(tahoe)
	173	asm(" movl -8(fp),r12"); /* selfpc = callf frame */
	174	asm(" movl (fp),r11");
	175	asm(" movl -8(r11),r11"); /* frompcindex = 1 callf frame back */
	176	#endif
	177	#if defined(hp300)
	178	Fix Me!!
	179	#endif
	180	#endif /* not __GNUC__ */
	181	#endif /* not lint */
	182	/*
	183	* Insure that we cannot be recursively invoked.
	184	* this requires that splhigh() and splx() below
	185	* do NOT call mcount!
	186	*/
	187	#if defined(hp300)
	188	asm("movw sr,%0" : "=g" (s));
	189	asm("movw #0x2700,sr");
	190	#else
	191	s = splhigh();
	192	#endif
	193	/*
	194	* Check that frompcindex is a reasonable pc value.
	195	* For example: signal catchers get called from the stack,
	196	* not from text space. too bad.
	197	*/
	198	frompcindex = (u_short *)((u_long)frompcindex - (u_long)s_lowpc);
	199	if ((u_long)frompcindex > s_textsize)
	200	goto done;
	201	frompcindex =
	202	&froms[((long)frompcindex) / (HASHFRACTION * sizeof (*froms))];
	203	toindex = *frompcindex;
	204	if (toindex == 0) {
	205	/*
	206	* First time traversing this arc
	207	*/
	208	toindex = ++tos[0].link;
	209	if (toindex >= tolimit)
	210	goto overflow;
	211	*frompcindex = toindex;
	212	top = &tos[toindex];
	213	top->selfpc = selfpc;
	214	top->count = 1;
	215	top->link = 0;
	216	goto done;
	217	}
	218	top = &tos[toindex];
	219	if (top->selfpc == selfpc) {
	220	/*
	221	* Arc at front of chain; usual case.
	222	*/
	223	top->count++;
	224	goto done;
	225	}
	226	/*
	227	* Have to go looking down chain for it.
	228	* Top points to what we are looking at,
	229	* prevtop points to previous top.
	230	* We know it is not at the head of the chain.
	231	*/
	232	for (; /* goto done */; ) {
	233	if (top->link == 0) {
	234	/*
235	* Top is end of the chain and none of the chain
236	* had top->selfpc == selfpc.
237	* So we allocate a new tostruct
238	* and link it to the head of the chain.
239	*/
240	toindex = ++tos[0].link;
241	if (toindex >= tolimit)
242	goto overflow;
243	top = &tos[toindex];
244	top->selfpc = selfpc;
245	top->count = 1;
246	top->link = *frompcindex;
247	*frompcindex = toindex;
248	goto done;
249	}
250	/*
251	* Otherwise, check the next arc on the chain.
252	*/
253	prevtop = top;
254	top = &tos[top->link];
255	if (top->selfpc == selfpc) {
256	/*
257	* There it is, increment its count and
258	* move it to the head of the chain.
259	*/
260	top->count++;
261	toindex = prevtop->link;
262	prevtop->link = top->link;
263	top->link = *frompcindex;
264	*frompcindex = toindex;
265	goto done;
266	}
267
268	}
269	done:
270	#if defined(hp300)
271	asm("movw %0,sr" : : "g" (s));
272	#else
273	splx(s);
274	#endif
275	/* and fall through */
276	out:
277	#if defined(vax)
278	asm(" rsb");
279	#endif
280	return;
281	overflow:
282	profiling = 3;
283	printf("mcount: tos overflow\n");
284	goto out;
285	}
286	#endif