Differential D3319 Diff 8080 head/lib/libkvm/kvm_minidump_aarch64.c

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head/lib/libkvm/kvm_minidump_aarch64.c

Property	Old Value	New Value
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svn:keywords	null	FreeBSD=%H \ No newline at end of property
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				/*-
				* Copyright (c) 2006 Peter Wemm
				*
				* 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.
				*
				* From: FreeBSD: src/lib/libkvm/kvm_minidump_amd64.c r261799
				*/

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

				/*
				* ARM64 (AArch64) machine dependent routines for kvm and minidumps.
				*/

				#include <sys/param.h>
				#include <sys/user.h>
				#include <sys/proc.h>
				#include <sys/stat.h>
				#include <sys/mman.h>
				#include <sys/fnv_hash.h>
				#include <stdlib.h>
				#include <string.h>
				#include <unistd.h>
				#include <nlist.h>
				#include <kvm.h>

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

				#include <machine/elf.h>
				#include <machine/cpufunc.h>
				#include <machine/pte.h>
				#include <machine/minidump.h>

				#include <limits.h>
				#include <stdint.h>

				#include "kvm_private.h"

				struct hpte {
				struct hpte *next;
				vm_paddr_t pa;
				int64_t off;
				};

				#define HPT_SIZE 1024

				/* minidump must be the first item! */
				struct vmstate {
				int minidump; /* 1 = minidump mode */
				struct minidumphdr hdr;
				void *hpt_head[HPT_SIZE];
				uint64_t *bitmap;
				uint64_t *page_map;
				};

				static void
				hpt_insert(kvm_t *kd, vm_paddr_t pa, int64_t off)
				{
				struct hpte *hpte;
				uint32_t fnv = FNV1_32_INIT;

				fnv = fnv_32_buf(&pa, sizeof(pa), fnv);
				fnv &= (HPT_SIZE - 1);
				hpte = malloc(sizeof(*hpte));
				hpte->pa = pa;
				hpte->off = off;
				hpte->next = kd->vmst->hpt_head[fnv];
				kd->vmst->hpt_head[fnv] = hpte;
				}

				static int64_t
				hpt_find(kvm_t *kd, vm_paddr_t pa)
				{
				struct hpte *hpte;
				uint32_t fnv = FNV1_32_INIT;

				fnv = fnv_32_buf(&pa, sizeof(pa), fnv);
				fnv &= (HPT_SIZE - 1);
				for (hpte = kd->vmst->hpt_head[fnv]; hpte != NULL; hpte = hpte->next) {
				if (pa == hpte->pa)
				return (hpte->off);
				}
				return (-1);
				}

				static int
				inithash(kvm_t kd, uint64_t base, int len, off_t off)
				{
				uint64_t idx;
				uint64_t bit, bits;
				vm_paddr_t pa;

				for (idx = 0; idx < len / sizeof(*base); idx++) {
				bits = base[idx];
				while (bits) {
				bit = ffsl(bits) - 1;
				bits &= ~(1ul << bit);
				pa = (idx * sizeof(base) NBBY + bit) * PAGE_SIZE;
				hpt_insert(kd, pa, off);
				off += PAGE_SIZE;
				}
				}
				return (off);
				}

				void
				_kvm_minidump_freevtop(kvm_t *kd)
				{
				struct vmstate *vm = kd->vmst;

				free(vm->bitmap);
				free(vm->page_map);
				free(vm);
				kd->vmst = NULL;
				}

				int
				_kvm_minidump_initvtop(kvm_t *kd)
				{
				struct vmstate *vmst;
				off_t off;

				vmst = _kvm_malloc(kd, sizeof(*vmst));
				if (vmst == 0) {
				_kvm_err(kd, kd->program, "cannot allocate vm");
				return (-1);
				}
				kd->vmst = vmst;
				vmst->minidump = 1;
				if (pread(kd->pmfd, &vmst->hdr, sizeof(vmst->hdr), 0) !=
				sizeof(vmst->hdr)) {
				_kvm_err(kd, kd->program, "cannot read dump header");
				return (-1);
				}
				if (strncmp(MINIDUMP_MAGIC, vmst->hdr.magic,
				sizeof(vmst->hdr.magic)) != 0) {
				_kvm_err(kd, kd->program, "not a minidump for this platform");
				return (-1);
				}

				if (vmst->hdr.version != MINIDUMP_VERSION && vmst->hdr.version != 1) {
				_kvm_err(kd, kd->program, "wrong minidump version. "
				"Expected %d got %d", MINIDUMP_VERSION, vmst->hdr.version);
				return (-1);
				}

				/* Skip header and msgbuf */
				off = PAGE_SIZE + round_page(vmst->hdr.msgbufsize);

				vmst->bitmap = _kvm_malloc(kd, vmst->hdr.bitmapsize);
				if (vmst->bitmap == NULL) {
				_kvm_err(kd, kd->program,
				"cannot allocate %d bytes for bitmap",
				vmst->hdr.bitmapsize);
				return (-1);
				}
				if (pread(kd->pmfd, vmst->bitmap, vmst->hdr.bitmapsize, off) !=
				vmst->hdr.bitmapsize) {
				_kvm_err(kd, kd->program,
				"cannot read %d bytes for page bitmap",
				vmst->hdr.bitmapsize);
				return (-1);
				}
				off += round_page(vmst->hdr.bitmapsize);

				vmst->page_map = _kvm_malloc(kd, vmst->hdr.pmapsize);
				if (vmst->page_map == NULL) {
				_kvm_err(kd, kd->program,
				"cannot allocate %d bytes for page_map",
				vmst->hdr.pmapsize);
				return (-1);
				}
				/* This is the end of the dump, savecore may have truncated it. */
				if (pread(kd->pmfd, vmst->page_map, vmst->hdr.pmapsize, off) <
				PAGE_SIZE) {
				_kvm_err(kd, kd->program, "cannot read %d bytes for page_map",
				vmst->hdr.pmapsize);
				}
				off += vmst->hdr.pmapsize;

				/* build physical address hash table for sparse pages */
				inithash(kd, vmst->bitmap, vmst->hdr.bitmapsize, off);

				return (0);
				}

				static int
				_kvm_minidump_vatop(kvm_t kd, u_long va, off_t pa)
				{
				struct vmstate *vm;
				u_long offset;
				pt_entry_t l3;
				u_long l3_index;
				u_long a;
				off_t ofs;

				vm = kd->vmst;
				offset = va & PAGE_MASK;

				if (va >= vm->hdr.dmapbase && va < vm->hdr.dmapend) {
				a = (va - vm->hdr.dmapbase + vm->hdr.dmapphys) & ~PAGE_MASK;
				ofs = hpt_find(kd, a);
				if (ofs == -1) {
				_kvm_err(kd, kd->program, "_kvm_vatop: "
				"direct map address 0x%lx not in minidump", va);
				goto invalid;
				}
				*pa = ofs + offset;
				return (PAGE_SIZE - offset);
				} else if (va >= vm->hdr.kernbase) {
				l3_index = (va - vm->hdr.kernbase) >> L3_SHIFT;
				if (l3_index >= vm->hdr.pmapsize / sizeof(*vm->page_map))
				goto invalid;
				l3 = vm->page_map[l3_index];
				if ((l3 & ATTR_DESCR_MASK) != L3_PAGE) {
				_kvm_err(kd, kd->program, "_kvm_vatop: pde not valid");
				goto invalid;
				}
				a = l3 & ~ATTR_MASK;
				ofs = hpt_find(kd, a);
				if (ofs == -1) {
				_kvm_err(kd, kd->program, "_kvm_vatop: "
				"physical address 0x%lx not in minidump", a);
				goto invalid;
				}
				*pa = ofs + offset;
				return (PAGE_SIZE - offset);
				} else {
				_kvm_err(kd, kd->program,
				"_kvm_vatop: virtual address 0x%lx not minidumped", va);
				goto invalid;
				}

				invalid:
				_kvm_err(kd, 0, "invalid address (0x%lx)", va);
				return (0);
				}

				int
				_kvm_minidump_kvatop(kvm_t kd, u_long va, off_t pa)
				{

				if (ISALIVE(kd)) {
				_kvm_err(kd, 0, "kvm_kvatop called in live kernel!");
				return (0);
				}
				return (_kvm_minidump_vatop(kd, va, pa));
				}