1/*-
2 * Copyright (c) 2005, Joseph Koshy
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 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 */
27
28#include <sys/cdefs.h>
29__FBSDID("$FreeBSD$");
30
31#include <sys/param.h>
32#include <sys/pmc.h>
33#include <sys/proc.h>
34#include <sys/systm.h>
35
36#include <machine/cpu.h>
37#include <machine/md_var.h>
38#include <machine/pmc_mdep.h>
39
40#include <vm/vm.h>
41#include <vm/vm_param.h>
42#include <vm/pmap.h>
43
44struct pmc_mdep *
45pmc_md_initialize()
46{
47#ifdef CPU_XSCALE_IXP425
48	if (cpu_class == CPU_CLASS_XSCALE)
49		return pmc_xscale_initialize();
50	else
51#endif
52		return NULL;
53}
54
55void
56pmc_md_finalize(struct pmc_mdep *md)
57{
58#ifdef CPU_XSCALE_IXP425
59	if (cpu_class == CPU_CLASS_XSCALE)
60		pmc_xscale_finalize(md);
61	else
62		KASSERT(0, ("[arm,%d] Unknown CPU Class 0x%x", __LINE__,
63		    cpu_class));
64#endif
65}
66
67int
68pmc_save_kernel_callchain(uintptr_t *cc, int maxsamples,
69    struct trapframe *tf)
70{
71	uintptr_t pc, r, stackstart, stackend, fp;
72	struct thread *td;
73	int count;
74
75	KASSERT(TRAPF_USERMODE(tf) == 0,("[arm,%d] not a kernel backtrace",
76	    __LINE__));
77
78	td = curthread;
79	pc = PMC_TRAPFRAME_TO_PC(tf);
80	*cc++ = pc;
81
82	if (maxsamples <= 1)
83		return (1);
84
85	stackstart = (uintptr_t) td->td_kstack;
86	stackend = (uintptr_t) td->td_kstack + td->td_kstack_pages * PAGE_SIZE;
87	fp = PMC_TRAPFRAME_TO_FP(tf);
88
89	if (!PMC_IN_KERNEL(pc) ||
90	    !PMC_IN_KERNEL_STACK(fp, stackstart, stackend))
91		return (1);
92
93	for (count = 1; count < maxsamples; count++) {
94		/* Use saved lr as pc. */
95		r = fp - sizeof(uintptr_t);
96		if (!PMC_IN_KERNEL_STACK(r, stackstart, stackend))
97			break;
98		pc = *(uintptr_t *)r;
99		if (!PMC_IN_KERNEL(pc))
100			break;
101
102		*cc++ = pc;
103
104		/* Switch to next frame up */
105		r = fp - 3 * sizeof(uintptr_t);
106		if (!PMC_IN_KERNEL_STACK(r, stackstart, stackend))
107			break;
108		fp = *(uintptr_t *)r;
109		if (!PMC_IN_KERNEL_STACK(fp, stackstart, stackend))
110			break;
111	}
112
113	return (count);
114}
115
116int
117pmc_save_user_callchain(uintptr_t *cc, int maxsamples,
118    struct trapframe *tf)
119{
120	uintptr_t pc, r, oldfp, fp;
121	struct thread *td;
122	int count;
123
124	KASSERT(TRAPF_USERMODE(tf), ("[x86,%d] Not a user trap frame tf=%p",
125	    __LINE__, (void *) tf));
126
127	td = curthread;
128	pc = PMC_TRAPFRAME_TO_PC(tf);
129	*cc++ = pc;
130
131	if (maxsamples <= 1)
132		return (1);
133
134	oldfp = fp = PMC_TRAPFRAME_TO_FP(tf);
135
136	if (!PMC_IN_USERSPACE(pc) ||
137	    !PMC_IN_USERSPACE(fp))
138		return (1);
139
140	for (count = 1; count < maxsamples; count++) {
141		/* Use saved lr as pc. */
142		r = fp - sizeof(uintptr_t);
143		if (copyin((void *)r, &pc, sizeof(pc)) != 0)
144			break;
145		if (!PMC_IN_USERSPACE(pc))
146			break;
147
148		*cc++ = pc;
149
150		/* Switch to next frame up */
151		oldfp = fp;
152		r = fp - 3 * sizeof(uintptr_t);
153		if (copyin((void *)r, &fp, sizeof(fp)) != 0)
154			break;
155		if (fp < oldfp || !PMC_IN_USERSPACE(fp))
156			break;
157	}
158
159	return (count);
160}
161