svn commit: r355557 - head/lib/libkvm
Leandro Lupori
luporl at FreeBSD.org
Mon Dec 9 13:59:38 UTC 2019
Author: luporl
Date: Mon Dec 9 13:59:36 2019
New Revision: 355557
URL: https://svnweb.freebsd.org/changeset/base/355557
Log:
[PPC64] Initial libkvm minidump implementation
This change adds PowerPC64 support for minidumps on libkvm.
Address translation, page walk, and data retrieval were tested and seem to be
working correctly.
Reviewed by: jhibbits
Differential Revision: https://reviews.freebsd.org/D21555
Added:
head/lib/libkvm/kvm_minidump_powerpc64.c (contents, props changed)
head/lib/libkvm/kvm_minidump_powerpc64_hpt.c (contents, props changed)
head/lib/libkvm/kvm_powerpc64.h (contents, props changed)
Modified:
head/lib/libkvm/Makefile
Modified: head/lib/libkvm/Makefile
==============================================================================
--- head/lib/libkvm/Makefile Mon Dec 9 13:40:23 2019 (r355556)
+++ head/lib/libkvm/Makefile Mon Dec 9 13:59:36 2019 (r355557)
@@ -19,6 +19,7 @@ SRCS= kvm.c kvm_cptime.c kvm_getloadavg.c \
kvm_minidump_mips.c \
kvm_powerpc.c kvm_powerpc64.c \
kvm_minidump_riscv.c \
+ kvm_minidump_powerpc64.c kvm_minidump_powerpc64_hpt.c \
kvm_sparc64.c
INCS= kvm.h
Added: head/lib/libkvm/kvm_minidump_powerpc64.c
==============================================================================
--- /dev/null 00:00:00 1970 (empty, because file is newly added)
+++ head/lib/libkvm/kvm_minidump_powerpc64.c Mon Dec 9 13:59:36 2019 (r355557)
@@ -0,0 +1,202 @@
+/*-
+ * Copyright (c) 2006 Peter Wemm
+ * Copyright (c) 2019 Leandro Lupori
+ *
+ * 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_riscv.c
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+
+#include <kvm.h>
+
+#include <limits.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "../../sys/powerpc/include/minidump.h"
+#include "kvm_private.h"
+#include "kvm_powerpc64.h"
+
+
+static int
+_powerpc64_minidump_probe(kvm_t *kd)
+{
+ return (_kvm_probe_elf_kernel(kd, ELFCLASS64, EM_PPC64) &&
+ _kvm_is_minidump(kd));
+}
+
+static void
+_powerpc64_minidump_freevtop(kvm_t *kd)
+{
+ struct vmstate *vm = kd->vmst;
+
+ if (vm == NULL)
+ return;
+ if (PPC64_MMU_OPS(kd))
+ PPC64_MMU_OP(kd, cleanup);
+ free(vm);
+ kd->vmst = NULL;
+}
+
+static int
+_powerpc64_minidump_initvtop(kvm_t *kd)
+{
+ struct vmstate *vmst;
+ struct minidumphdr *hdr;
+ off_t bitmap_off, pmap_off, sparse_off;
+ const char *mmu_name;
+
+ /* Alloc VM */
+ vmst = _kvm_malloc(kd, sizeof(*vmst));
+ if (vmst == NULL) {
+ _kvm_err(kd, kd->program, "cannot allocate vm");
+ return (-1);
+ }
+ hdr = &vmst->hdr;
+ kd->vmst = vmst;
+ PPC64_MMU_OPS(kd) = NULL;
+ /* Read minidump header */
+ if (pread(kd->pmfd, hdr, sizeof(*hdr), 0) != sizeof(*hdr)) {
+ _kvm_err(kd, kd->program, "cannot read minidump header");
+ goto failed;
+ }
+ /* Check magic */
+ if (strncmp(MINIDUMP_MAGIC, hdr->magic, sizeof(hdr->magic)) != 0) {
+ _kvm_err(kd, kd->program, "not a minidump for this platform");
+ goto failed;
+ }
+ /* Check version */
+ hdr->version = be32toh(hdr->version);
+ if (hdr->version != MINIDUMP_VERSION) {
+ _kvm_err(kd, kd->program, "wrong minidump version. "
+ "Expected %d got %d", MINIDUMP_VERSION, hdr->version);
+ goto failed;
+ }
+ /* Convert header fields to host endian */
+ hdr->msgbufsize = be32toh(hdr->msgbufsize);
+ hdr->bitmapsize = be32toh(hdr->bitmapsize);
+ hdr->pmapsize = be32toh(hdr->pmapsize);
+ hdr->kernbase = be64toh(hdr->kernbase);
+ hdr->kernend = be64toh(hdr->kernend);
+ hdr->dmapbase = be64toh(hdr->dmapbase);
+ hdr->dmapend = be64toh(hdr->dmapend);
+ hdr->hw_direct_map = be32toh(hdr->hw_direct_map);
+ hdr->startkernel = be64toh(hdr->startkernel);
+ hdr->endkernel = be64toh(hdr->endkernel);
+
+ vmst->kimg_start = PPC64_KERNBASE;
+ vmst->kimg_end = PPC64_KERNBASE + hdr->endkernel - hdr->startkernel;
+
+ /* dump header */
+ dprintf("%s: mmu_name=%s,\n\t"
+ "msgbufsize=0x%jx, bitmapsize=0x%jx, pmapsize=0x%jx, "
+ "kernbase=0x%jx, kernend=0x%jx,\n\t"
+ "dmapbase=0x%jx, dmapend=0x%jx, hw_direct_map=%d, "
+ "startkernel=0x%jx, endkernel=0x%jx\n\t"
+ "kimg_start=0x%jx, kimg_end=0x%jx\n",
+ __func__, hdr->mmu_name,
+ (uintmax_t)hdr->msgbufsize,
+ (uintmax_t)hdr->bitmapsize, (uintmax_t)hdr->pmapsize,
+ (uintmax_t)hdr->kernbase, (uintmax_t)hdr->kernend,
+ (uintmax_t)hdr->dmapbase, (uintmax_t)hdr->dmapend,
+ hdr->hw_direct_map, hdr->startkernel, hdr->endkernel,
+ (uintmax_t)vmst->kimg_start, (uintmax_t)vmst->kimg_end);
+
+ /* Detect and initialize MMU */
+ mmu_name = hdr->mmu_name;
+ if (strcmp(mmu_name, PPC64_MMU_G5) == 0 ||
+ strcmp(mmu_name, PPC64_MMU_PHYP) == 0)
+ PPC64_MMU_OPS(kd) = ppc64_mmu_ops_hpt;
+ else {
+ _kvm_err(kd, kd->program, "unsupported MMU: %s", mmu_name);
+ goto failed;
+ }
+ if (PPC64_MMU_OP(kd, init) == -1)
+ goto failed;
+
+ /* Get dump parts' offsets */
+ bitmap_off = PPC64_PAGE_SIZE + ppc64_round_page(hdr->msgbufsize);
+ pmap_off = bitmap_off + ppc64_round_page(hdr->bitmapsize);
+ sparse_off = pmap_off + ppc64_round_page(hdr->pmapsize);
+
+ /* dump offsets */
+ dprintf("%s: msgbuf_off=0x%jx, bitmap_off=0x%jx, pmap_off=0x%jx, "
+ "sparse_off=0x%jx\n",
+ __func__, (uintmax_t)PPC64_PAGE_SIZE, (uintmax_t)bitmap_off,
+ (uintmax_t)pmap_off, (uintmax_t)sparse_off);
+
+ /* build physical address lookup table for sparse pages */
+ if (_kvm_pt_init(kd, hdr->bitmapsize, bitmap_off, sparse_off,
+ PPC64_PAGE_SIZE, sizeof(uint64_t)) == -1)
+ goto failed;
+
+ if (_kvm_pmap_init(kd, hdr->pmapsize, pmap_off) == -1)
+ goto failed;
+ return (0);
+
+failed:
+ _powerpc64_minidump_freevtop(kd);
+ return (-1);
+}
+
+static int
+_powerpc64_minidump_kvatop(kvm_t *kd, kvaddr_t va, off_t *pa)
+{
+ if (ISALIVE(kd)) {
+ _kvm_err(kd, 0, "%s called in live kernel!", __func__);
+ return (0);
+ }
+ return (PPC64_MMU_OP(kd, kvatop, va, pa));
+}
+
+static int
+_powerpc64_native(kvm_t *kd __unused)
+{
+#ifdef __powerpc64__
+ return (1);
+#else
+ return (0);
+#endif
+}
+
+static int
+_powerpc64_minidump_walk_pages(kvm_t *kd, kvm_walk_pages_cb_t *cb, void *arg)
+{
+ return (PPC64_MMU_OP(kd, walk_pages, cb, arg));
+}
+
+static struct kvm_arch kvm_powerpc64_minidump = {
+ .ka_probe = _powerpc64_minidump_probe,
+ .ka_initvtop = _powerpc64_minidump_initvtop,
+ .ka_freevtop = _powerpc64_minidump_freevtop,
+ .ka_kvatop = _powerpc64_minidump_kvatop,
+ .ka_walk_pages = _powerpc64_minidump_walk_pages,
+ .ka_native = _powerpc64_native,
+};
+
+KVM_ARCH(kvm_powerpc64_minidump);
Added: head/lib/libkvm/kvm_minidump_powerpc64_hpt.c
==============================================================================
--- /dev/null 00:00:00 1970 (empty, because file is newly added)
+++ head/lib/libkvm/kvm_minidump_powerpc64_hpt.c Mon Dec 9 13:59:36 2019 (r355557)
@@ -0,0 +1,666 @@
+/*-
+ * Copyright (c) 2006 Peter Wemm
+ * Copyright (c) 2019 Leandro Lupori
+ *
+ * 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_riscv.c
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <vm/vm.h>
+
+#include <kvm.h>
+
+#include <limits.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "../../sys/powerpc/include/minidump.h"
+#include "kvm_private.h"
+#include "kvm_powerpc64.h"
+
+/*
+ * PowerPC64 HPT machine dependent routines for kvm and minidumps.
+ *
+ * Address Translation parameters:
+ *
+ * b = 12 (SLB base page size: 4 KB)
+ * b = 24 (SLB base page size: 16 MB)
+ * p = 12 (page size: 4 KB)
+ * p = 24 (page size: 16 MB)
+ * s = 28 (segment size: 256 MB)
+ */
+
+/* Large (huge) page params */
+#define LP_PAGE_SHIFT 24
+#define LP_PAGE_SIZE (1ULL << LP_PAGE_SHIFT)
+#define LP_PAGE_MASK 0x00ffffffULL
+
+/* SLB */
+
+#define SEGMENT_LENGTH 0x10000000ULL
+
+#define round_seg(x) roundup2((uint64_t)(x), SEGMENT_LENGTH)
+
+/* Virtual real-mode VSID in LPARs */
+#define VSID_VRMA 0x1ffffffULL
+
+#define SLBV_L 0x0000000000000100ULL /* Large page selector */
+#define SLBV_CLASS 0x0000000000000080ULL /* Class selector */
+#define SLBV_LP_MASK 0x0000000000000030ULL
+#define SLBV_VSID_MASK 0x3ffffffffffff000ULL /* Virtual SegID mask */
+#define SLBV_VSID_SHIFT 12
+
+#define SLBE_B_MASK 0x0000000006000000ULL
+#define SLBE_B_256MB 0x0000000000000000ULL
+#define SLBE_VALID 0x0000000008000000ULL /* SLB entry valid */
+#define SLBE_INDEX_MASK 0x0000000000000fffULL /* SLB index mask */
+#define SLBE_ESID_MASK 0xfffffffff0000000ULL /* Effective SegID mask */
+#define SLBE_ESID_SHIFT 28
+
+/* PTE */
+
+#define LPTEH_VSID_SHIFT 12
+#define LPTEH_AVPN_MASK 0xffffffffffffff80ULL
+#define LPTEH_B_MASK 0xc000000000000000ULL
+#define LPTEH_B_256MB 0x0000000000000000ULL
+#define LPTEH_BIG 0x0000000000000004ULL /* 4KB/16MB page */
+#define LPTEH_HID 0x0000000000000002ULL
+#define LPTEH_VALID 0x0000000000000001ULL
+
+#define LPTEL_RPGN 0xfffffffffffff000ULL
+#define LPTEL_LP_MASK 0x00000000000ff000ULL
+#define LPTEL_NOEXEC 0x0000000000000004ULL
+
+/* Supervisor (U: RW, S: RW) */
+#define LPTEL_BW 0x0000000000000002ULL
+
+/* Both Read Only (U: RO, S: RO) */
+#define LPTEL_BR 0x0000000000000003ULL
+
+#define LPTEL_RW LPTEL_BW
+#define LPTEL_RO LPTEL_BR
+
+/*
+ * PTE AVA field manipulation macros.
+ *
+ * AVA[0:54] = PTEH[2:56]
+ * AVA[VSID] = AVA[0:49] = PTEH[2:51]
+ * AVA[PAGE] = AVA[50:54] = PTEH[52:56]
+ */
+#define PTEH_AVA_VSID_MASK 0x3ffffffffffff000UL
+#define PTEH_AVA_VSID_SHIFT 12
+#define PTEH_AVA_VSID(p) \
+ (((p) & PTEH_AVA_VSID_MASK) >> PTEH_AVA_VSID_SHIFT)
+
+#define PTEH_AVA_PAGE_MASK 0x0000000000000f80UL
+#define PTEH_AVA_PAGE_SHIFT 7
+#define PTEH_AVA_PAGE(p) \
+ (((p) & PTEH_AVA_PAGE_MASK) >> PTEH_AVA_PAGE_SHIFT)
+
+/* Masks to obtain the Physical Address from PTE low 64-bit word. */
+#define PTEL_PA_MASK 0x0ffffffffffff000UL
+#define PTEL_LP_PA_MASK 0x0fffffffff000000UL
+
+#define PTE_HASH_MASK 0x0000007fffffffffUL
+
+/*
+ * Number of AVA/VA page bits to shift right, in order to leave only the
+ * ones that should be considered.
+ *
+ * q = MIN(54, 77-b) (PowerISA v2.07B, 5.7.7.3)
+ * n = q + 1 - 50 (VSID size in bits)
+ * s(ava) = 5 - n
+ * s(va) = (28 - b) - n
+ *
+ * q: bit number of lower limit of VA/AVA bits to compare
+ * n: number of AVA/VA page bits to compare
+ * s: shift amount
+ * 28 - b: VA page size in bits
+ */
+#define AVA_PAGE_SHIFT(b) (5 - (MIN(54, 77-(b)) + 1 - 50))
+#define VA_PAGE_SHIFT(b) (28 - (b) - (MIN(54, 77-(b)) + 1 - 50))
+
+/* Kernel ESID -> VSID mapping */
+#define KERNEL_VSID_BIT 0x0000001000000000UL /* Bit set in all kernel VSIDs */
+#define KERNEL_VSID(esid) ((((((uint64_t)esid << 8) | ((uint64_t)esid >> 28)) \
+ * 0x13bbUL) & (KERNEL_VSID_BIT - 1)) | \
+ KERNEL_VSID_BIT)
+
+/* Types */
+
+typedef uint64_t ppc64_physaddr_t;
+
+typedef struct {
+ uint64_t slbv;
+ uint64_t slbe;
+} ppc64_slb_entry_t;
+
+typedef struct {
+ uint64_t pte_hi;
+ uint64_t pte_lo;
+} ppc64_pt_entry_t;
+
+struct hpt_data {
+ ppc64_slb_entry_t *slbs;
+ uint32_t slbsize;
+};
+
+
+static void
+slb_fill(ppc64_slb_entry_t *slb, uint64_t ea, uint64_t i)
+{
+ uint64_t esid;
+
+ esid = ea >> SLBE_ESID_SHIFT;
+ slb->slbv = KERNEL_VSID(esid) << SLBV_VSID_SHIFT;
+ slb->slbe = (esid << SLBE_ESID_SHIFT) | SLBE_VALID | i;
+}
+
+static int
+slb_init(kvm_t *kd)
+{
+ struct minidumphdr *hdr;
+ struct hpt_data *data;
+ ppc64_slb_entry_t *slb;
+ uint32_t slbsize;
+ uint64_t ea, i, maxmem;
+
+ hdr = &kd->vmst->hdr;
+ data = PPC64_MMU_DATA(kd);
+
+ /* Alloc SLBs */
+ maxmem = hdr->bitmapsize * 8 * PPC64_PAGE_SIZE;
+ slbsize = round_seg(hdr->kernend + 1 - hdr->kernbase + maxmem) /
+ SEGMENT_LENGTH * sizeof(ppc64_slb_entry_t);
+ data->slbs = _kvm_malloc(kd, slbsize);
+ if (data->slbs == NULL) {
+ _kvm_err(kd, kd->program, "cannot allocate slbs");
+ return (-1);
+ }
+ data->slbsize = slbsize;
+
+ dprintf("%s: maxmem=0x%jx, segs=%jd, slbsize=0x%jx\n",
+ __func__, (uintmax_t)maxmem,
+ (uintmax_t)slbsize / sizeof(ppc64_slb_entry_t), (uintmax_t)slbsize);
+
+ /*
+ * Generate needed SLB entries.
+ *
+ * When translating addresses from EA to VA to PA, the needed SLB
+ * entry could be generated on the fly, but this is not the case
+ * for the walk_pages method, that needs to search the SLB entry
+ * by VSID, in order to find out the EA from a PTE.
+ */
+
+ /* VM area */
+ for (ea = hdr->kernbase, i = 0, slb = data->slbs;
+ ea < hdr->kernend; ea += SEGMENT_LENGTH, i++, slb++)
+ slb_fill(slb, ea, i);
+
+ /* DMAP area */
+ for (ea = hdr->dmapbase;
+ ea < MIN(hdr->dmapend, hdr->dmapbase + maxmem);
+ ea += SEGMENT_LENGTH, i++, slb++) {
+ slb_fill(slb, ea, i);
+ if (hdr->hw_direct_map)
+ slb->slbv |= SLBV_L;
+ }
+
+ return (0);
+}
+
+static void
+ppc64mmu_hpt_cleanup(kvm_t *kd)
+{
+ struct hpt_data *data;
+
+ if (kd->vmst == NULL)
+ return;
+
+ data = PPC64_MMU_DATA(kd);
+ free(data->slbs);
+ free(data);
+ PPC64_MMU_DATA(kd) = NULL;
+}
+
+static int
+ppc64mmu_hpt_init(kvm_t *kd)
+{
+ struct hpt_data *data;
+ struct minidumphdr *hdr;
+
+ hdr = &kd->vmst->hdr;
+
+ /* Alloc MMU data */
+ data = _kvm_malloc(kd, sizeof(*data));
+ if (data == NULL) {
+ _kvm_err(kd, kd->program, "cannot allocate MMU data");
+ return (-1);
+ }
+ data->slbs = NULL;
+ PPC64_MMU_DATA(kd) = data;
+
+ if (slb_init(kd) == -1)
+ goto failed;
+
+ return (0);
+
+failed:
+ ppc64mmu_hpt_cleanup(kd);
+ return (-1);
+}
+
+static ppc64_slb_entry_t *
+slb_search(kvm_t *kd, kvaddr_t ea)
+{
+ struct hpt_data *data;
+ ppc64_slb_entry_t *slb;
+ int i, n;
+
+ data = PPC64_MMU_DATA(kd);
+ slb = data->slbs;
+ n = data->slbsize / sizeof(ppc64_slb_entry_t);
+
+ /* SLB search */
+ for (i = 0; i < n; i++, slb++) {
+ if ((slb->slbe & SLBE_VALID) == 0)
+ continue;
+
+ /* Compare 36-bit ESID of EA with segment one (64-s) */
+ if ((slb->slbe & SLBE_ESID_MASK) != (ea & SLBE_ESID_MASK))
+ continue;
+
+ /* Match found */
+ dprintf("SEG#%02d: slbv=0x%016jx, slbe=0x%016jx\n",
+ i, (uintmax_t)slb->slbv, (uintmax_t)slb->slbe);
+ break;
+ }
+
+ /* SLB not found */
+ if (i == n) {
+ _kvm_err(kd, kd->program, "%s: segment not found for EA 0x%jx",
+ __func__, (uintmax_t)ea);
+ return (NULL);
+ }
+ return (slb);
+}
+
+static ppc64_pt_entry_t
+pte_get(kvm_t *kd, u_long ptex)
+{
+ ppc64_pt_entry_t pte, *p;
+
+ p = _kvm_pmap_get(kd, ptex, sizeof(pte));
+ pte.pte_hi = be64toh(p->pte_hi);
+ pte.pte_lo = be64toh(p->pte_lo);
+ return (pte);
+}
+
+static int
+pte_search(kvm_t *kd, ppc64_slb_entry_t *slb, uint64_t hid, kvaddr_t ea,
+ ppc64_pt_entry_t *p)
+{
+ uint64_t hash, hmask;
+ uint64_t pteg, ptex;
+ uint64_t va_vsid, va_page;
+ int b;
+ int ava_pg_shift, va_pg_shift;
+ ppc64_pt_entry_t pte;
+
+ /*
+ * Get VA:
+ *
+ * va(78) = va_vsid(50) || va_page(s-b) || offset(b)
+ *
+ * va_vsid: 50-bit VSID (78-s)
+ * va_page: (s-b)-bit VA page
+ */
+ b = slb->slbv & SLBV_L? LP_PAGE_SHIFT : PPC64_PAGE_SHIFT;
+ va_vsid = (slb->slbv & SLBV_VSID_MASK) >> SLBV_VSID_SHIFT;
+ va_page = (ea & ~SLBE_ESID_MASK) >> b;
+
+ dprintf("%s: hid=0x%jx, ea=0x%016jx, b=%d, va_vsid=0x%010jx, "
+ "va_page=0x%04jx\n",
+ __func__, (uintmax_t)hid, (uintmax_t)ea, b,
+ (uintmax_t)va_vsid, (uintmax_t)va_page);
+
+ /*
+ * Get hash:
+ *
+ * Primary hash: va_vsid(11:49) ^ va_page(s-b)
+ * Secondary hash: ~primary_hash
+ */
+ hash = (va_vsid & PTE_HASH_MASK) ^ va_page;
+ if (hid)
+ hash = ~hash & PTE_HASH_MASK;
+
+ /*
+ * Get PTEG:
+ *
+ * pteg = (hash(0:38) & hmask) << 3
+ *
+ * hmask (hash mask): mask generated from HTABSIZE || 11*0b1
+ * hmask = number_of_ptegs - 1
+ */
+ hmask = kd->vmst->hdr.pmapsize / (8 * sizeof(ppc64_pt_entry_t)) - 1;
+ pteg = (hash & hmask) << 3;
+
+ ava_pg_shift = AVA_PAGE_SHIFT(b);
+ va_pg_shift = VA_PAGE_SHIFT(b);
+
+ dprintf("%s: hash=0x%010jx, hmask=0x%010jx, (hash & hmask)=0x%010jx, "
+ "pteg=0x%011jx, ava_pg_shift=%d, va_pg_shift=%d\n",
+ __func__, (uintmax_t)hash, (uintmax_t)hmask,
+ (uintmax_t)(hash & hmask), (uintmax_t)pteg,
+ ava_pg_shift, va_pg_shift);
+
+ /* Search PTEG */
+ for (ptex = pteg; ptex < pteg + 8; ptex++) {
+ pte = pte_get(kd, ptex);
+
+ /* Check H, V and B */
+ if ((pte.pte_hi & LPTEH_HID) != hid ||
+ (pte.pte_hi & LPTEH_VALID) == 0 ||
+ (pte.pte_hi & LPTEH_B_MASK) != LPTEH_B_256MB)
+ continue;
+
+ /* Compare AVA with VA */
+ if (PTEH_AVA_VSID(pte.pte_hi) != va_vsid ||
+ (PTEH_AVA_PAGE(pte.pte_hi) >> ava_pg_shift) !=
+ (va_page >> va_pg_shift))
+ continue;
+
+ /*
+ * Check if PTE[L] matches SLBV[L].
+ *
+ * Note: this check ignores PTE[LP], as does the kernel.
+ */
+ if (b == PPC64_PAGE_SHIFT) {
+ if (pte.pte_hi & LPTEH_BIG)
+ continue;
+ } else if ((pte.pte_hi & LPTEH_BIG) == 0)
+ continue;
+
+ /* Match found */
+ dprintf("%s: PTE found: ptex=0x%jx, pteh=0x%016jx, "
+ "ptel=0x%016jx\n",
+ __func__, (uintmax_t)ptex, (uintmax_t)pte.pte_hi,
+ (uintmax_t)pte.pte_lo);
+ break;
+ }
+
+ /* Not found? */
+ if (ptex == pteg + 8) {
+ /* Try secondary hash */
+ if (hid == 0)
+ return (pte_search(kd, slb, LPTEH_HID, ea, p));
+ else {
+ _kvm_err(kd, kd->program,
+ "%s: pte not found", __func__);
+ return (-1);
+ }
+ }
+
+ /* PTE found */
+ *p = pte;
+ return (0);
+}
+
+static int
+pte_lookup(kvm_t *kd, kvaddr_t ea, ppc64_pt_entry_t *pte)
+{
+ ppc64_slb_entry_t *slb;
+
+ /* First, find SLB */
+ if ((slb = slb_search(kd, ea)) == NULL)
+ return (-1);
+
+ /* Next, find PTE */
+ return (pte_search(kd, slb, 0, ea, pte));
+}
+
+static int
+ppc64mmu_hpt_kvatop(kvm_t *kd, kvaddr_t va, off_t *pa)
+{
+ struct minidumphdr *hdr;
+ struct vmstate *vm;
+ ppc64_pt_entry_t pte;
+ ppc64_physaddr_t pgoff, pgpa;
+ off_t ptoff;
+ int err;
+
+ vm = kd->vmst;
+ hdr = &vm->hdr;
+ pgoff = va & PPC64_PAGE_MASK;
+
+ dprintf("%s: va=0x%016jx\n", __func__, (uintmax_t)va);
+
+ /*
+ * A common use case of libkvm is to first find a symbol address
+ * from the kernel image and then use kvatop to translate it and
+ * to be able to fetch its corresponding data.
+ *
+ * The problem is that, in PowerPC64 case, the addresses of relocated
+ * data won't match those in the kernel image. This is handled here by
+ * adding the relocation offset to those addresses.
+ */
+ if (va < hdr->dmapbase)
+ va += hdr->startkernel - PPC64_KERNBASE;
+
+ /* Handle DMAP */
+ if (va >= hdr->dmapbase && va <= hdr->dmapend) {
+ pgpa = (va & ~hdr->dmapbase) & ~PPC64_PAGE_MASK;
+ ptoff = _kvm_pt_find(kd, pgpa, PPC64_PAGE_SIZE);
+ if (ptoff == -1) {
+ _kvm_err(kd, kd->program, "%s: "
+ "direct map address 0x%jx not in minidump",
+ __func__, (uintmax_t)va);
+ goto invalid;
+ }
+ *pa = ptoff + pgoff;
+ return (PPC64_PAGE_SIZE - pgoff);
+ /* Translate VA to PA */
+ } else if (va >= hdr->kernbase) {
+ if ((err = pte_lookup(kd, va, &pte)) == -1) {
+ _kvm_err(kd, kd->program,
+ "%s: pte not valid", __func__);
+ goto invalid;
+ }
+
+ if (pte.pte_hi & LPTEH_BIG)
+ pgpa = (pte.pte_lo & PTEL_LP_PA_MASK) |
+ (va & ~PPC64_PAGE_MASK & LP_PAGE_MASK);
+ else
+ pgpa = pte.pte_lo & PTEL_PA_MASK;
+ dprintf("%s: pgpa=0x%016jx\n", __func__, (uintmax_t)pgpa);
+
+ ptoff = _kvm_pt_find(kd, pgpa, PPC64_PAGE_SIZE);
+ if (ptoff == -1) {
+ _kvm_err(kd, kd->program, "%s: "
+ "physical address 0x%jx not in minidump",
+ __func__, (uintmax_t)pgpa);
+ goto invalid;
+ }
+ *pa = ptoff + pgoff;
+ return (PPC64_PAGE_SIZE - pgoff);
+ } else {
+ _kvm_err(kd, kd->program,
+ "%s: virtual address 0x%jx not minidumped",
+ __func__, (uintmax_t)va);
+ goto invalid;
+ }
+
+invalid:
+ _kvm_err(kd, 0, "invalid address (0x%jx)", (uintmax_t)va);
+ return (0);
+}
+
+static vm_prot_t
+entry_to_prot(ppc64_pt_entry_t *pte)
+{
+ vm_prot_t prot = VM_PROT_READ;
+
+ if (pte->pte_lo & LPTEL_RW)
+ prot |= VM_PROT_WRITE;
+ if ((pte->pte_lo & LPTEL_NOEXEC) != 0)
+ prot |= VM_PROT_EXECUTE;
+ return (prot);
+}
+
+static ppc64_slb_entry_t *
+slb_vsid_search(kvm_t *kd, uint64_t vsid)
+{
+ struct hpt_data *data;
+ ppc64_slb_entry_t *slb;
+ int i, n;
+
+ data = PPC64_MMU_DATA(kd);
+ slb = data->slbs;
+ n = data->slbsize / sizeof(ppc64_slb_entry_t);
+ vsid <<= SLBV_VSID_SHIFT;
+
+ /* SLB search */
+ for (i = 0; i < n; i++, slb++) {
+ /* Check if valid and compare VSID */
+ if ((slb->slbe & SLBE_VALID) &&
+ (slb->slbv & SLBV_VSID_MASK) == vsid)
+ break;
+ }
+
+ /* SLB not found */
+ if (i == n) {
+ _kvm_err(kd, kd->program,
+ "%s: segment not found for VSID 0x%jx",
+ __func__, (uintmax_t)vsid >> SLBV_VSID_SHIFT);
+ return (NULL);
+ }
+ return (slb);
+}
+
+static u_long
+get_ea(kvm_t *kd, ppc64_pt_entry_t *pte, u_long ptex)
+{
+ ppc64_slb_entry_t *slb;
+ uint64_t ea, hash, vsid;
+ int b, shift;
+
+ /* Find SLB */
+ vsid = PTEH_AVA_VSID(pte->pte_hi);
+ if ((slb = slb_vsid_search(kd, vsid)) == NULL)
+ return (~0UL);
+
+ /* Get ESID part of EA */
+ ea = slb->slbe & SLBE_ESID_MASK;
+
+ b = slb->slbv & SLBV_L? LP_PAGE_SHIFT : PPC64_PAGE_SHIFT;
+
+ /*
+ * If there are less than 64K PTEGs (16-bit), the upper bits of
+ * EA page must be obtained from PTEH's AVA.
+ */
+ if (kd->vmst->hdr.pmapsize / (8 * sizeof(ppc64_pt_entry_t)) <
+ 0x10000U) {
+ /*
+ * Add 0 to 5 EA bits, right after VSID.
+ * b == 12: 5 bits
+ * b == 24: 4 bits
+ */
+ shift = AVA_PAGE_SHIFT(b);
+ ea |= (PTEH_AVA_PAGE(pte->pte_hi) >> shift) <<
+ (SLBE_ESID_SHIFT - 5 + shift);
+ }
+
+ /* Get VA page from hash and add to EA. */
+ hash = (ptex & ~7) >> 3;
+ if (pte->pte_hi & LPTEH_HID)
+ hash = ~hash & PTE_HASH_MASK;
+ ea |= ((hash ^ (vsid & PTE_HASH_MASK)) << b) & ~SLBE_ESID_MASK;
+ return (ea);
+}
+
+static int
+ppc64mmu_hpt_walk_pages(kvm_t *kd, kvm_walk_pages_cb_t *cb, void *arg)
+{
+ struct vmstate *vm;
+ int ret;
+ unsigned int pagesz;
+ u_long dva, pa, va;
+ u_long ptex, nptes;
+ uint64_t vsid;
+
+ ret = 0;
+ vm = kd->vmst;
+ nptes = vm->hdr.pmapsize / sizeof(ppc64_pt_entry_t);
+
+ /* Walk through PTEs */
+ for (ptex = 0; ptex < nptes; ptex++) {
+ ppc64_pt_entry_t pte = pte_get(kd, ptex);
+ if ((pte.pte_hi & LPTEH_VALID) == 0)
+ continue;
+
+ /* Skip non-kernel related pages, as well as VRMA ones */
+ vsid = PTEH_AVA_VSID(pte.pte_hi);
+ if ((vsid & KERNEL_VSID_BIT) == 0 ||
+ (vsid >> PPC64_PAGE_SHIFT) == VSID_VRMA)
+ continue;
+
+ /* Retrieve page's VA (EA on PPC64 terminology) */
+ if ((va = get_ea(kd, &pte, ptex)) == ~0UL)
+ goto out;
+
+ /* Get PA and page size */
+ if (pte.pte_hi & LPTEH_BIG) {
+ pa = pte.pte_lo & PTEL_LP_PA_MASK;
+ pagesz = LP_PAGE_SIZE;
+ } else {
+ pa = pte.pte_lo & PTEL_PA_MASK;
+ pagesz = PPC64_PAGE_SIZE;
+ }
+
+ /* Get DMAP address */
+ dva = vm->hdr.dmapbase + pa;
+
+ if (!_kvm_visit_cb(kd, cb, arg, pa, va, dva,
+ entry_to_prot(&pte), pagesz, 0))
+ goto out;
+ }
+ ret = 1;
+
+out:
+ return (ret);
+}
+
+
+static struct ppc64_mmu_ops ops = {
+ .init = ppc64mmu_hpt_init,
+ .cleanup = ppc64mmu_hpt_cleanup,
+ .kvatop = ppc64mmu_hpt_kvatop,
+ .walk_pages = ppc64mmu_hpt_walk_pages,
+};
+struct ppc64_mmu_ops *ppc64_mmu_ops_hpt = &ops;
Added: head/lib/libkvm/kvm_powerpc64.h
==============================================================================
--- /dev/null 00:00:00 1970 (empty, because file is newly added)
+++ head/lib/libkvm/kvm_powerpc64.h Mon Dec 9 13:59:36 2019 (r355557)
@@ -0,0 +1,81 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
+ * Copyright (c) 2019 Leandro Lupori
+ *
+ * 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.
+ *
+ * $FreeBSD$
+ */
+
+#ifndef __KVM_POWERPC64_H__
+#define __KVM_POWERPC64_H__
+
+/* Debug stuff */
+#define KVM_PPC64_DBG 0
+#if KVM_PPC64_DBG
+#include <stdio.h>
+#define dprintf(fmt, ...) printf(fmt, ## __VA_ARGS__)
+#else
+#define dprintf(fmt, ...)
+#endif
+
+
+#define PPC64_KERNBASE 0x100100ULL
+
+/* Page params */
+#define PPC64_PAGE_SHIFT 12
+#define PPC64_PAGE_SIZE (1ULL << PPC64_PAGE_SHIFT)
+#define PPC64_PAGE_MASK (PPC64_PAGE_SIZE - 1)
+
+#define ppc64_round_page(x) roundup2((kvaddr_t)(x), PPC64_PAGE_SIZE)
+
+#define PPC64_MMU_G5 "mmu_g5"
+#define PPC64_MMU_PHYP "mmu_phyp"
+
+/* MMU interface */
+#define PPC64_MMU_OPS(kd) (kd)->vmst->mmu.ops
+#define PPC64_MMU_OP(kd, op, ...) PPC64_MMU_OPS(kd)->op((kd), ## __VA_ARGS__)
+#define PPC64_MMU_DATA(kd) (kd)->vmst->mmu.data
+
+struct ppc64_mmu_ops {
+ int (*init)(kvm_t *);
+ void (*cleanup)(kvm_t *);
+ int (*kvatop)(kvm_t *, kvaddr_t, off_t *);
+ int (*walk_pages)(kvm_t *, kvm_walk_pages_cb_t *, void *);
+};
+
+struct ppc64_mmu {
+ struct ppc64_mmu_ops *ops;
+ void *data;
+};
+
+struct vmstate {
+ struct minidumphdr hdr;
+ uint64_t kimg_start;
+ uint64_t kimg_end;
+ struct ppc64_mmu mmu;
+};
+
+extern struct ppc64_mmu_ops *ppc64_mmu_ops_hpt;
+
+#endif /* !__KVM_POWERPC64_H__ */
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