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![Leandro Lupori](/assets/img/avatar_default.png)
This change adds a new libkvm function, kvm_kerndisp(), that can be used to retrieve the kernel displacement, that is the difference between the kernel's base virtual address at run time and the kernel base virtual address specified in the kernel image file. This will be used by kgdb, to properly relocate kernel symbols, when needed. Reviewed by: jhb Differential Revision: https://reviews.freebsd.org/D23285
210 lines
6.2 KiB
C
210 lines
6.2 KiB
C
/*-
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* Copyright (c) 2006 Peter Wemm
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* Copyright (c) 2019 Leandro Lupori
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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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* From: FreeBSD: src/lib/libkvm/kvm_minidump_riscv.c
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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 <kvm.h>
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#include <limits.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "../../sys/powerpc/include/minidump.h"
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#include "kvm_private.h"
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#include "kvm_powerpc64.h"
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static int
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_powerpc64_minidump_probe(kvm_t *kd)
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{
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return (_kvm_probe_elf_kernel(kd, ELFCLASS64, EM_PPC64) &&
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_kvm_is_minidump(kd));
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}
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static void
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_powerpc64_minidump_freevtop(kvm_t *kd)
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{
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struct vmstate *vm = kd->vmst;
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if (vm == NULL)
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return;
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if (PPC64_MMU_OPS(kd))
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PPC64_MMU_OP(kd, cleanup);
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free(vm);
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kd->vmst = NULL;
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}
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static int
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_powerpc64_minidump_initvtop(kvm_t *kd)
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{
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struct vmstate *vmst;
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struct minidumphdr *hdr;
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off_t bitmap_off, pmap_off, sparse_off;
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const char *mmu_name;
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/* Alloc VM */
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vmst = _kvm_malloc(kd, sizeof(*vmst));
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if (vmst == NULL) {
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_kvm_err(kd, kd->program, "cannot allocate vm");
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return (-1);
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}
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hdr = &vmst->hdr;
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kd->vmst = vmst;
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PPC64_MMU_OPS(kd) = NULL;
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/* Read minidump header */
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if (pread(kd->pmfd, hdr, sizeof(*hdr), 0) != sizeof(*hdr)) {
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_kvm_err(kd, kd->program, "cannot read minidump header");
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goto failed;
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}
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/* Check magic */
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if (strncmp(MINIDUMP_MAGIC, hdr->magic, sizeof(hdr->magic)) != 0) {
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_kvm_err(kd, kd->program, "not a minidump for this platform");
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goto failed;
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}
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/* Check version */
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hdr->version = be32toh(hdr->version);
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if (hdr->version != MINIDUMP_VERSION) {
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_kvm_err(kd, kd->program, "wrong minidump version. "
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"Expected %d got %d", MINIDUMP_VERSION, hdr->version);
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goto failed;
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}
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/* Convert header fields to host endian */
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hdr->msgbufsize = be32toh(hdr->msgbufsize);
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hdr->bitmapsize = be32toh(hdr->bitmapsize);
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hdr->pmapsize = be32toh(hdr->pmapsize);
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hdr->kernbase = be64toh(hdr->kernbase);
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hdr->kernend = be64toh(hdr->kernend);
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hdr->dmapbase = be64toh(hdr->dmapbase);
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hdr->dmapend = be64toh(hdr->dmapend);
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hdr->hw_direct_map = be32toh(hdr->hw_direct_map);
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hdr->startkernel = be64toh(hdr->startkernel);
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hdr->endkernel = be64toh(hdr->endkernel);
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vmst->kimg_start = PPC64_KERNBASE;
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vmst->kimg_end = PPC64_KERNBASE + hdr->endkernel - hdr->startkernel;
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/* dump header */
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dprintf("%s: mmu_name=%s,\n\t"
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"msgbufsize=0x%jx, bitmapsize=0x%jx, pmapsize=0x%jx, "
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"kernbase=0x%jx, kernend=0x%jx,\n\t"
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"dmapbase=0x%jx, dmapend=0x%jx, hw_direct_map=%d, "
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"startkernel=0x%jx, endkernel=0x%jx\n\t"
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"kimg_start=0x%jx, kimg_end=0x%jx\n",
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__func__, hdr->mmu_name,
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(uintmax_t)hdr->msgbufsize,
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(uintmax_t)hdr->bitmapsize, (uintmax_t)hdr->pmapsize,
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(uintmax_t)hdr->kernbase, (uintmax_t)hdr->kernend,
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(uintmax_t)hdr->dmapbase, (uintmax_t)hdr->dmapend,
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hdr->hw_direct_map, hdr->startkernel, hdr->endkernel,
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(uintmax_t)vmst->kimg_start, (uintmax_t)vmst->kimg_end);
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/* Detect and initialize MMU */
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mmu_name = hdr->mmu_name;
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if (strcmp(mmu_name, PPC64_MMU_G5) == 0 ||
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strcmp(mmu_name, PPC64_MMU_PHYP) == 0)
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PPC64_MMU_OPS(kd) = ppc64_mmu_ops_hpt;
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else {
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_kvm_err(kd, kd->program, "unsupported MMU: %s", mmu_name);
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goto failed;
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}
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if (PPC64_MMU_OP(kd, init) == -1)
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goto failed;
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/* Get dump parts' offsets */
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bitmap_off = PPC64_PAGE_SIZE + ppc64_round_page(hdr->msgbufsize);
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pmap_off = bitmap_off + ppc64_round_page(hdr->bitmapsize);
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sparse_off = pmap_off + ppc64_round_page(hdr->pmapsize);
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/* dump offsets */
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dprintf("%s: msgbuf_off=0x%jx, bitmap_off=0x%jx, pmap_off=0x%jx, "
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"sparse_off=0x%jx\n",
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__func__, (uintmax_t)PPC64_PAGE_SIZE, (uintmax_t)bitmap_off,
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(uintmax_t)pmap_off, (uintmax_t)sparse_off);
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/* build physical address lookup table for sparse pages */
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if (_kvm_pt_init(kd, hdr->bitmapsize, bitmap_off, sparse_off,
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PPC64_PAGE_SIZE, sizeof(uint64_t)) == -1)
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goto failed;
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if (_kvm_pmap_init(kd, hdr->pmapsize, pmap_off) == -1)
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goto failed;
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return (0);
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failed:
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_powerpc64_minidump_freevtop(kd);
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return (-1);
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}
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static int
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_powerpc64_minidump_kvatop(kvm_t *kd, kvaddr_t va, off_t *pa)
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{
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if (ISALIVE(kd)) {
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_kvm_err(kd, 0, "%s called in live kernel!", __func__);
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return (0);
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}
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return (PPC64_MMU_OP(kd, kvatop, va, pa));
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}
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static int
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_powerpc64_native(kvm_t *kd __unused)
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{
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#ifdef __powerpc64__
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return (1);
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#else
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return (0);
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#endif
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}
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static kssize_t
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_powerpc64_kerndisp(kvm_t *kd)
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{
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return (kd->vmst->hdr.startkernel - PPC64_KERNBASE);
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}
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static int
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_powerpc64_minidump_walk_pages(kvm_t *kd, kvm_walk_pages_cb_t *cb, void *arg)
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{
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return (PPC64_MMU_OP(kd, walk_pages, cb, arg));
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}
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static struct kvm_arch kvm_powerpc64_minidump = {
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.ka_probe = _powerpc64_minidump_probe,
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.ka_initvtop = _powerpc64_minidump_initvtop,
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.ka_freevtop = _powerpc64_minidump_freevtop,
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.ka_kvatop = _powerpc64_minidump_kvatop,
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.ka_walk_pages = _powerpc64_minidump_walk_pages,
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.ka_native = _powerpc64_native,
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.ka_kerndisp = _powerpc64_kerndisp,
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};
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KVM_ARCH(kvm_powerpc64_minidump);
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