xref: /freebsd/sys/dev/hwpmc/hwpmc_arm.c (revision 790fb4edf2081e491d98165792dbd74ca18be603)
1f263522aSJoseph Koshy /*-
2f263522aSJoseph Koshy  * Copyright (c) 2005, Joseph Koshy
3f263522aSJoseph Koshy  * All rights reserved.
4f263522aSJoseph Koshy  *
5f263522aSJoseph Koshy  * Redistribution and use in source and binary forms, with or without
6f263522aSJoseph Koshy  * modification, are permitted provided that the following conditions
7f263522aSJoseph Koshy  * are met:
8f263522aSJoseph Koshy  * 1. Redistributions of source code must retain the above copyright
9f263522aSJoseph Koshy  *    notice, this list of conditions and the following disclaimer.
10f263522aSJoseph Koshy  * 2. Redistributions in binary form must reproduce the above copyright
11f263522aSJoseph Koshy  *    notice, this list of conditions and the following disclaimer in the
12f263522aSJoseph Koshy  *    documentation and/or other materials provided with the distribution.
13f263522aSJoseph Koshy  *
14f263522aSJoseph Koshy  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15f263522aSJoseph Koshy  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16f263522aSJoseph Koshy  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17f263522aSJoseph Koshy  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18f263522aSJoseph Koshy  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19f263522aSJoseph Koshy  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20f263522aSJoseph Koshy  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21f263522aSJoseph Koshy  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22f263522aSJoseph Koshy  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23f263522aSJoseph Koshy  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24f263522aSJoseph Koshy  * SUCH DAMAGE.
25f263522aSJoseph Koshy  *
26f263522aSJoseph Koshy  */
27f263522aSJoseph Koshy 
28f263522aSJoseph Koshy #include <sys/cdefs.h>
29f263522aSJoseph Koshy __FBSDID("$FreeBSD$");
30f263522aSJoseph Koshy 
31f263522aSJoseph Koshy #include <sys/param.h>
32f263522aSJoseph Koshy #include <sys/pmc.h>
33*790fb4edSFabien Thomas #include <sys/proc.h>
340ce207d2SRui Paulo #include <sys/systm.h>
35f263522aSJoseph Koshy 
36*790fb4edSFabien Thomas #include <machine/cpu.h>
370ce207d2SRui Paulo #include <machine/md_var.h>
38*790fb4edSFabien Thomas #include <machine/pmc_mdep.h>
39*790fb4edSFabien Thomas 
40*790fb4edSFabien Thomas #include <vm/vm.h>
41*790fb4edSFabien Thomas #include <vm/vm_param.h>
42*790fb4edSFabien Thomas #include <vm/pmap.h>
43f263522aSJoseph Koshy 
44f263522aSJoseph Koshy struct pmc_mdep *
45f263522aSJoseph Koshy pmc_md_initialize()
46f263522aSJoseph Koshy {
474cc50ab4SFabien Thomas #ifdef CPU_XSCALE_IXP425
480ce207d2SRui Paulo 	if (cpu_class == CPU_CLASS_XSCALE)
490ce207d2SRui Paulo 		return pmc_xscale_initialize();
500ce207d2SRui Paulo 	else
514cc50ab4SFabien Thomas #endif
52f263522aSJoseph Koshy 		return NULL;
53f263522aSJoseph Koshy }
549596916cSJoseph Koshy 
55c85e8dcfSJoseph Koshy void
56c85e8dcfSJoseph Koshy pmc_md_finalize(struct pmc_mdep *md)
57c85e8dcfSJoseph Koshy {
584cc50ab4SFabien Thomas #ifdef CPU_XSCALE_IXP425
590ce207d2SRui Paulo 	if (cpu_class == CPU_CLASS_XSCALE)
600ce207d2SRui Paulo 		pmc_xscale_finalize(md);
610ce207d2SRui Paulo 	else
620ce207d2SRui Paulo 		KASSERT(0, ("[arm,%d] Unknown CPU Class 0x%x", __LINE__,
630ce207d2SRui Paulo 		    cpu_class));
644cc50ab4SFabien Thomas #endif
654cc50ab4SFabien Thomas }
664cc50ab4SFabien Thomas 
679596916cSJoseph Koshy int
689596916cSJoseph Koshy pmc_save_kernel_callchain(uintptr_t *cc, int maxsamples,
699596916cSJoseph Koshy     struct trapframe *tf)
709596916cSJoseph Koshy {
71*790fb4edSFabien Thomas 	uintptr_t pc, r, stackstart, stackend, fp;
72*790fb4edSFabien Thomas 	struct thread *td;
73*790fb4edSFabien Thomas 	int count;
744cc50ab4SFabien Thomas 
75*790fb4edSFabien Thomas 	KASSERT(TRAPF_USERMODE(tf) == 0,("[arm,%d] not a kernel backtrace",
76*790fb4edSFabien Thomas 	    __LINE__));
77*790fb4edSFabien Thomas 
78*790fb4edSFabien Thomas 	pc = PMC_TRAPFRAME_TO_PC(tf);
79*790fb4edSFabien Thomas 	*cc++ = pc;
80*790fb4edSFabien Thomas 
81*790fb4edSFabien Thomas 	if ((td = curthread) == NULL)
82*790fb4edSFabien Thomas 		return (1);
83*790fb4edSFabien Thomas 
84*790fb4edSFabien Thomas 	if (maxsamples <= 1)
85*790fb4edSFabien Thomas 		return (1);
86*790fb4edSFabien Thomas 
87*790fb4edSFabien Thomas 	stackstart = (uintptr_t) td->td_kstack;
88*790fb4edSFabien Thomas 	stackend = (uintptr_t) td->td_kstack + td->td_kstack_pages * PAGE_SIZE;
89*790fb4edSFabien Thomas 	fp = PMC_TRAPFRAME_TO_FP(tf);
90*790fb4edSFabien Thomas 
91*790fb4edSFabien Thomas 	if (!PMC_IN_KERNEL(pc) ||
92*790fb4edSFabien Thomas 	    !PMC_IN_KERNEL_STACK(fp, stackstart, stackend))
93*790fb4edSFabien Thomas 		return (1);
94*790fb4edSFabien Thomas 
95*790fb4edSFabien Thomas 	for (count = 1; count < maxsamples; count++) {
96*790fb4edSFabien Thomas 		/* Use saved lr as pc. */
97*790fb4edSFabien Thomas 		r = fp - sizeof(uintptr_t);
98*790fb4edSFabien Thomas 		if (!PMC_IN_KERNEL_STACK(r, stackstart, stackend))
99*790fb4edSFabien Thomas 			break;
100*790fb4edSFabien Thomas 		pc = *(uintptr_t *)r;
101*790fb4edSFabien Thomas 		if (!PMC_IN_KERNEL(pc))
102*790fb4edSFabien Thomas 			break;
103*790fb4edSFabien Thomas 
104*790fb4edSFabien Thomas 		*cc++ = pc;
105*790fb4edSFabien Thomas 
106*790fb4edSFabien Thomas 		/* Switch to next frame up */
107*790fb4edSFabien Thomas 		r = fp - 3 * sizeof(uintptr_t);
108*790fb4edSFabien Thomas 		if (!PMC_IN_KERNEL_STACK(r, stackstart, stackend))
109*790fb4edSFabien Thomas 			break;
110*790fb4edSFabien Thomas 		fp = *(uintptr_t *)r;
111*790fb4edSFabien Thomas 		if (!PMC_IN_KERNEL_STACK(fp, stackstart, stackend))
112*790fb4edSFabien Thomas 			break;
113*790fb4edSFabien Thomas 	}
114*790fb4edSFabien Thomas 
115*790fb4edSFabien Thomas 	return (count);
1169596916cSJoseph Koshy }
1179596916cSJoseph Koshy 
1189596916cSJoseph Koshy int
1199596916cSJoseph Koshy pmc_save_user_callchain(uintptr_t *cc, int maxsamples,
1209596916cSJoseph Koshy     struct trapframe *tf)
1219596916cSJoseph Koshy {
122*790fb4edSFabien Thomas 	uintptr_t pc, r, oldfp, fp;
123*790fb4edSFabien Thomas 	struct thread *td;
124*790fb4edSFabien Thomas 	int count;
1254cc50ab4SFabien Thomas 
126*790fb4edSFabien Thomas 	KASSERT(TRAPF_USERMODE(tf), ("[x86,%d] Not a user trap frame tf=%p",
127*790fb4edSFabien Thomas 	    __LINE__, (void *) tf));
128*790fb4edSFabien Thomas 
129*790fb4edSFabien Thomas 	pc = PMC_TRAPFRAME_TO_PC(tf);
130*790fb4edSFabien Thomas 	*cc++ = pc;
131*790fb4edSFabien Thomas 
132*790fb4edSFabien Thomas 	if ((td = curthread) == NULL)
133*790fb4edSFabien Thomas 		return (1);
134*790fb4edSFabien Thomas 
135*790fb4edSFabien Thomas 	if (maxsamples <= 1)
136*790fb4edSFabien Thomas 		return (1);
137*790fb4edSFabien Thomas 
138*790fb4edSFabien Thomas 	oldfp = fp = PMC_TRAPFRAME_TO_FP(tf);
139*790fb4edSFabien Thomas 
140*790fb4edSFabien Thomas 	if (!PMC_IN_USERSPACE(pc) ||
141*790fb4edSFabien Thomas 	    !PMC_IN_USERSPACE(fp))
142*790fb4edSFabien Thomas 		return (1);
143*790fb4edSFabien Thomas 
144*790fb4edSFabien Thomas 	for (count = 1; count < maxsamples; count++) {
145*790fb4edSFabien Thomas 		/* Use saved lr as pc. */
146*790fb4edSFabien Thomas 		r = fp - sizeof(uintptr_t);
147*790fb4edSFabien Thomas 		if (copyin((void *)r, &pc, sizeof(pc)) != 0)
148*790fb4edSFabien Thomas 			break;
149*790fb4edSFabien Thomas 		if (!PMC_IN_USERSPACE(pc))
150*790fb4edSFabien Thomas 			break;
151*790fb4edSFabien Thomas 
152*790fb4edSFabien Thomas 		*cc++ = pc;
153*790fb4edSFabien Thomas 
154*790fb4edSFabien Thomas 		/* Switch to next frame up */
155*790fb4edSFabien Thomas 		oldfp = fp;
156*790fb4edSFabien Thomas 		r = fp - 3 * sizeof(uintptr_t);
157*790fb4edSFabien Thomas 		if (copyin((void *)r, &fp, sizeof(fp)) != 0)
158*790fb4edSFabien Thomas 			break;
159*790fb4edSFabien Thomas 		if (fp < oldfp || !PMC_IN_USERSPACE(fp))
160*790fb4edSFabien Thomas 			break;
161*790fb4edSFabien Thomas 	}
162*790fb4edSFabien Thomas 
163*790fb4edSFabien Thomas 	return (count);
1649596916cSJoseph Koshy }
165