2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2005, Joseph Koshy
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 #include <sys/cdefs.h>
31 __FBSDID("$FreeBSD$");
33 #include <sys/param.h>
36 #include <sys/systm.h>
38 #include <machine/cpu.h>
39 #include <machine/md_var.h>
40 #include <machine/pmc_mdep.h>
41 #include <machine/stack.h>
44 #include <vm/vm_param.h>
47 /* XXX: Userland code compiled with gcc will need an heuristic
48 * to be correctly detected.
61 #ifdef CPU_XSCALE_IXP425
62 if (cpu_class == CPU_CLASS_XSCALE)
63 return pmc_xscale_initialize();
66 if (cpu_class == CPU_CLASS_CORTEXA)
67 return pmc_armv7_initialize();
73 pmc_md_finalize(struct pmc_mdep *md)
75 #ifdef CPU_XSCALE_IXP425
76 if (cpu_class == CPU_CLASS_XSCALE)
77 pmc_xscale_finalize(md);
79 KASSERT(0, ("[arm,%d] Unknown CPU Class 0x%x", __LINE__,
83 if (cpu_class == CPU_CLASS_CORTEXA)
84 pmc_armv7_finalize(md);
89 pmc_save_kernel_callchain(uintptr_t *cc, int maxsamples,
92 uintptr_t pc, r, stackstart, stackend, fp;
96 KASSERT(TRAPF_USERMODE(tf) == 0,("[arm,%d] not a kernel backtrace",
100 pc = PMC_TRAPFRAME_TO_PC(tf);
106 stackstart = (uintptr_t) td->td_kstack;
107 stackend = (uintptr_t) td->td_kstack + td->td_kstack_pages * PAGE_SIZE;
108 fp = PMC_TRAPFRAME_TO_FP(tf);
110 if (!PMC_IN_KERNEL(pc) ||
111 !PMC_IN_KERNEL_STACK(fp, stackstart, stackend))
114 for (count = 1; count < maxsamples; count++) {
115 /* Use saved lr as pc. */
116 r = fp + PC_OFF * sizeof(uintptr_t);
117 if (!PMC_IN_KERNEL_STACK(r, stackstart, stackend))
119 pc = *(uintptr_t *)r;
120 if (!PMC_IN_KERNEL(pc))
125 /* Switch to next frame up */
126 r = fp + FP_OFF * sizeof(uintptr_t);
127 if (!PMC_IN_KERNEL_STACK(r, stackstart, stackend))
129 fp = *(uintptr_t *)r;
130 if (!PMC_IN_KERNEL_STACK(fp, stackstart, stackend))
138 pmc_save_user_callchain(uintptr_t *cc, int maxsamples,
139 struct trapframe *tf)
141 uintptr_t pc, r, oldfp, fp;
145 KASSERT(TRAPF_USERMODE(tf), ("[x86,%d] Not a user trap frame tf=%p",
146 __LINE__, (void *) tf));
149 pc = PMC_TRAPFRAME_TO_PC(tf);
155 oldfp = fp = PMC_TRAPFRAME_TO_FP(tf);
157 if (!PMC_IN_USERSPACE(pc) ||
158 !PMC_IN_USERSPACE(fp))
161 for (count = 1; count < maxsamples; count++) {
162 /* Use saved lr as pc. */
163 r = fp + PC_OFF * sizeof(uintptr_t);
164 if (copyin((void *)r, &pc, sizeof(pc)) != 0)
166 if (!PMC_IN_USERSPACE(pc))
171 /* Switch to next frame up */
173 r = fp + FP_OFF * sizeof(uintptr_t);
174 if (copyin((void *)r, &fp, sizeof(fp)) != 0)
176 if (fp < oldfp || !PMC_IN_USERSPACE(fp))