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
45 struct pmc_mdep *
pmc_md_initialize()46 pmc_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
59 void
pmc_md_finalize(struct pmc_mdep * md)60 pmc_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
75 int
pmc_save_kernel_callchain(uintptr_t * cc,int maxsamples,struct trapframe * tf)76 pmc_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
124 int
pmc_save_user_callchain(uintptr_t * cc,int maxsamples,struct trapframe * tf)125 pmc_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