718cf2ccb9
Mainly focus on files that use BSD 2-Clause license, however the tool I was using misidentified many licenses so this was mostly a manual - error prone - task. The Software Package Data Exchange (SPDX) group provides a specification to make it easier for automated tools to detect and summarize well known opensource licenses. We are gradually adopting the specification, noting that the tags are considered only advisory and do not, in any way, superceed or replace the license texts.
182 lines
4.4 KiB
C
182 lines
4.4 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_XSCALE_IXP425
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if (cpu_class == CPU_CLASS_XSCALE)
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return pmc_xscale_initialize();
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#endif
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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_XSCALE_IXP425
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if (cpu_class == CPU_CLASS_XSCALE)
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pmc_xscale_finalize(md);
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else
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KASSERT(0, ("[arm,%d] Unknown CPU Class 0x%x", __LINE__,
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cpu_class));
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#endif
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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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