Differential D2555 Diff 5408 sys/dev/hwpmc/hwpmc_armv8_md.c

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sys/dev/hwpmc/hwpmc_armv8_md.c

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				/*-
				andrewUnsubmitted Done Inline Actions This file looks to be arm64 specific, it should be named something like `hwpmc_arm64_md.c`. andrew: This file looks to be arm64 specific, it should be named something like `hwpmc_arm64_md.c`.
				* Copyright (c) 2015 Ruslan Bukin <br@bsdpad.com>
				* All rights reserved.
				*
				* Redistribution and use in source and binary forms, with or without
				* modification, are permitted provided that the following conditions
				* are met:
				* 1. Redistributions of source code must retain the above copyright
				* notice, this list of conditions and the following disclaimer.
				* 2. Redistributions in binary form must reproduce the above copyright
				* notice, this list of conditions and the following disclaimer in the
				* documentation and/or other materials provided with the distribution.
				*
				* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
				* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
				* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
				* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
				* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
				* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
				* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
				* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
				* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
				* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
				* SUCH DAMAGE.
				*/

				#include <sys/cdefs.h>
				__FBSDID("$FreeBSD$");

				#include <sys/param.h>
				#include <sys/pmc.h>
				#include <sys/proc.h>
				#include <sys/systm.h>

				#include <machine/cpu.h>
				#include <machine/md_var.h>
				#include <machine/pmc_mdep.h>
				#include <machine/stack.h>

				#include <vm/vm.h>
				#include <vm/vm_param.h>
				#include <vm/pmap.h>

				struct pmc_mdep *
				pmc_md_initialize()
				{

				return (pmc_armv8_initialize());
				}

				void
				pmc_md_finalize(struct pmc_mdep *md)
				{

				pmc_armv8_finalize(md);
				}

				int
				pmc_save_kernel_callchain(uintptr_t *cc, int maxsamples,
				struct trapframe *tf)
				{
				uintptr_t pc, r, stackstart, stackend, fp;
				struct thread *td;
				int count;

				KASSERT(TRAPF_USERMODE(tf) == 0,("[arm,%d] not a kernel backtrace",
				__LINE__));

				td = curthread;
				pc = PMC_TRAPFRAME_TO_PC(tf);
				*cc++ = pc;

				if (maxsamples <= 1)
				return (1);

				stackstart = (uintptr_t) td->td_kstack;
				stackend = (uintptr_t) td->td_kstack + td->td_kstack_pages * PAGE_SIZE;
				fp = PMC_TRAPFRAME_TO_FP(tf);

				if (!PMC_IN_KERNEL(pc) \|\|
				!PMC_IN_KERNEL_STACK(fp, stackstart, stackend))
				return (1);

				for (count = 1; count < maxsamples; count++) {
				/* Use saved lr as pc. */
				r = fp + sizeof(uintptr_t);
				if (!PMC_IN_KERNEL_STACK(r, stackstart, stackend))
				break;
				pc = (uintptr_t )r;
				if (!PMC_IN_KERNEL(pc))
				break;

				*cc++ = pc;

				/* Switch to next frame up */
				r = fp;
				if (!PMC_IN_KERNEL_STACK(r, stackstart, stackend))
				break;
				fp = (uintptr_t )r;
				if (!PMC_IN_KERNEL_STACK(fp, stackstart, stackend))
				break;
				}

				return (count);
				}

				int
				pmc_save_user_callchain(uintptr_t *cc, int maxsamples,
				struct trapframe *tf)
				{
				uintptr_t pc, r, oldfp, fp;
				struct thread *td;
				int count;

				KASSERT(TRAPF_USERMODE(tf), ("[x86,%d] Not a user trap frame tf=%p",
				__LINE__, (void *) tf));

				td = curthread;
				pc = PMC_TRAPFRAME_TO_PC(tf);
				*cc++ = pc;

				if (maxsamples <= 1)
				return (1);

				oldfp = fp = PMC_TRAPFRAME_TO_FP(tf);

				if (!PMC_IN_USERSPACE(pc) \|\|
				!PMC_IN_USERSPACE(fp))
				return (1);

				for (count = 1; count < maxsamples; count++) {
				/* Use saved lr as pc. */
				r = fp + sizeof(uintptr_t);
				if (copyin((void *)r, &pc, sizeof(pc)) != 0)
				break;
				if (!PMC_IN_USERSPACE(pc))
				break;

				*cc++ = pc;

				/* Switch to next frame up */
				oldfp = fp;
				r = fp;
				if (copyin((void *)r, &fp, sizeof(fp)) != 0)
				break;
				if (fp < oldfp \|\| !PMC_IN_USERSPACE(fp))
				break;
				}

				return (count);
				}