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#include <machine/stack.h>
40
41#include <vm/vm.h>
42#include <vm/vm_param.h>
43#include <vm/pmap.h>
44
45struct pmc_mdep *
46pmc_md_initialize()
47{
48#ifdef CPU_XSCALE_IXP425
49	if (cpu_class == CPU_CLASS_XSCALE)
50		return pmc_xscale_initialize();
51#endif
52#ifdef CPU_CORTEXA
53	if (cpu_class == CPU_CLASS_CORTEXA)
54		return pmc_armv7_initialize();
55#endif
56	return NULL;
57}
58
59void
60pmc_md_finalize(struct pmc_mdep *md)
61{
62#ifdef CPU_XSCALE_IXP425
63	if (cpu_class == CPU_CLASS_XSCALE)
64		pmc_xscale_finalize(md);
65	else
66		KASSERT(0, ("[arm,%d] Unknown CPU Class 0x%x", __LINE__,
67		    cpu_class));
68#endif
69#ifdef CPU_CORTEXA
70	if (cpu_class == CPU_CLASS_CORTEXA)
71		pmc_armv7_finalize(md);
72#endif
73}
74
75int
76pmc_save_kernel_callchain(uintptr_t *cc, int maxsamples,
77    struct trapframe *tf)
78{
79	uintptr_t pc, r, stackstart, stackend, fp;
80	struct thread *td;
81	int count;
82
83	KASSERT(TRAPF_USERMODE(tf) == 0,("[arm,%d] not a kernel backtrace",
84	    __LINE__));
85
86	td = curthread;
87	pc = PMC_TRAPFRAME_TO_PC(tf);
88	*cc++ = pc;
89
90	if (maxsamples <= 1)
91		return (1);
92
93	stackstart = (uintptr_t) td->td_kstack;
94	stackend = (uintptr_t) td->td_kstack + td->td_kstack_pages * PAGE_SIZE;
95	fp = PMC_TRAPFRAME_TO_FP(tf);
96
97	if (!PMC_IN_KERNEL(pc) ||
98	    !PMC_IN_KERNEL_STACK(fp, stackstart, stackend))
99		return (1);
100
101	for (count = 1; count < maxsamples; count++) {
102		/* Use saved lr as pc. */
103		r = fp - sizeof(uintptr_t);
104		if (!PMC_IN_KERNEL_STACK(r, stackstart, stackend))
105			break;
106		pc = *(uintptr_t *)r;
107		if (!PMC_IN_KERNEL(pc))
108			break;
109
110		*cc++ = pc;
111
112		/* Switch to next frame up */
113		r = fp - 3 * sizeof(uintptr_t);
114		if (!PMC_IN_KERNEL_STACK(r, stackstart, stackend))
115			break;
116		fp = *(uintptr_t *)r;
117		if (!PMC_IN_KERNEL_STACK(fp, stackstart, stackend))
118			break;
119	}
120
121	return (count);
122}
123
124int
125pmc_save_user_callchain(uintptr_t *cc, int maxsamples,
126    struct trapframe *tf)
127{
128	uintptr_t pc, r, oldfp, fp;
129	struct thread *td;
130	int count;
131
132	KASSERT(TRAPF_USERMODE(tf), ("[x86,%d] Not a user trap frame tf=%p",
133	    __LINE__, (void *) tf));
134
135	td = curthread;
136	pc = PMC_TRAPFRAME_TO_PC(tf);
137	*cc++ = pc;
138
139	if (maxsamples <= 1)
140		return (1);
141
142	oldfp = fp = PMC_TRAPFRAME_TO_FP(tf);
143
144	if (!PMC_IN_USERSPACE(pc) ||
145	    !PMC_IN_USERSPACE(fp))
146		return (1);
147
148	for (count = 1; count < maxsamples; count++) {
149		/* Use saved lr as pc. */
150		r = fp - sizeof(uintptr_t);
151		if (copyin((void *)r, &pc, sizeof(pc)) != 0)
152			break;
153		if (!PMC_IN_USERSPACE(pc))
154			break;
155
156		*cc++ = pc;
157
158		/* Switch to next frame up */
159		oldfp = fp;
160		r = fp - 3 * sizeof(uintptr_t);
161		if (copyin((void *)r, &fp, sizeof(fp)) != 0)
162			break;
163		if (fp < oldfp || !PMC_IN_USERSPACE(fp))
164			break;
165	}
166
167	return (count);
168}
169