171 lines
4.1 KiB
C
171 lines
4.1 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2005, Joseph Koshy
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/pmc.h>
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#include <sys/proc.h>
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#include <sys/systm.h>
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#include <machine/cpu.h>
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#include <machine/md_var.h>
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#include <machine/pmc_mdep.h>
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#include <machine/stack.h>
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#include <vm/vm.h>
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#include <vm/vm_param.h>
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#include <vm/pmap.h>
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/* XXX: Userland code compiled with gcc will need an heuristic
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* to be correctly detected.
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*/
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#ifdef __clang__
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#define PC_OFF 1
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#define FP_OFF 0
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#else
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#define PC_OFF -1
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#define FP_OFF -3
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#endif
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struct pmc_mdep *
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pmc_md_initialize()
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{
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#ifdef CPU_CORTEXA
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if (cpu_class == CPU_CLASS_CORTEXA)
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return pmc_armv7_initialize();
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#endif
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return NULL;
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}
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void
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pmc_md_finalize(struct pmc_mdep *md)
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{
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#ifdef CPU_CORTEXA
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if (cpu_class == CPU_CLASS_CORTEXA)
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pmc_armv7_finalize(md);
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#endif
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}
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int
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pmc_save_kernel_callchain(uintptr_t *cc, int maxsamples,
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struct trapframe *tf)
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{
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uintptr_t pc, r, stackstart, stackend, fp;
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struct thread *td;
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int count;
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KASSERT(TRAPF_USERMODE(tf) == 0,("[arm,%d] not a kernel backtrace",
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__LINE__));
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td = curthread;
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pc = PMC_TRAPFRAME_TO_PC(tf);
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*cc++ = pc;
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if (maxsamples <= 1)
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return (1);
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stackstart = (uintptr_t) td->td_kstack;
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stackend = (uintptr_t) td->td_kstack + td->td_kstack_pages * PAGE_SIZE;
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fp = PMC_TRAPFRAME_TO_FP(tf);
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if (!PMC_IN_KERNEL(pc) ||
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!PMC_IN_KERNEL_STACK(fp, stackstart, stackend))
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return (1);
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for (count = 1; count < maxsamples; count++) {
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/* Use saved lr as pc. */
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r = fp + PC_OFF * sizeof(uintptr_t);
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if (!PMC_IN_KERNEL_STACK(r, stackstart, stackend))
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break;
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pc = *(uintptr_t *)r;
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if (!PMC_IN_KERNEL(pc))
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break;
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*cc++ = pc;
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/* Switch to next frame up */
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r = fp + FP_OFF * sizeof(uintptr_t);
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if (!PMC_IN_KERNEL_STACK(r, stackstart, stackend))
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break;
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fp = *(uintptr_t *)r;
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if (!PMC_IN_KERNEL_STACK(fp, stackstart, stackend))
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break;
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}
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return (count);
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}
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int
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pmc_save_user_callchain(uintptr_t *cc, int maxsamples,
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struct trapframe *tf)
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{
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uintptr_t pc, r, oldfp, fp;
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struct thread *td;
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int count;
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KASSERT(TRAPF_USERMODE(tf), ("[x86,%d] Not a user trap frame tf=%p",
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__LINE__, (void *) tf));
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td = curthread;
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pc = PMC_TRAPFRAME_TO_PC(tf);
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*cc++ = pc;
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if (maxsamples <= 1)
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return (1);
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oldfp = fp = PMC_TRAPFRAME_TO_FP(tf);
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if (!PMC_IN_USERSPACE(pc) ||
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!PMC_IN_USERSPACE(fp))
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return (1);
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for (count = 1; count < maxsamples; count++) {
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/* Use saved lr as pc. */
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r = fp + PC_OFF * sizeof(uintptr_t);
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if (copyin((void *)r, &pc, sizeof(pc)) != 0)
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break;
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if (!PMC_IN_USERSPACE(pc))
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break;
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*cc++ = pc;
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/* Switch to next frame up */
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oldfp = fp;
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r = fp + FP_OFF * sizeof(uintptr_t);
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if (copyin((void *)r, &fp, sizeof(fp)) != 0)
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break;
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if (fp < oldfp || !PMC_IN_USERSPACE(fp))
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break;
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}
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return (count);
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}
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