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Add riscv minidump support to libkvm.

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Submitted by:	Mitchell Horne <mhorne063@gmail.com>
Differential Revision:	https://reviews.freebsd.org/D19171
This commit is contained in:
Mark Johnston 2019-03-05 23:59:55 +00:00
parent 3a3dfb2815
commit 5e58ed820a
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=344829
3 changed files with 379 additions and 0 deletions
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1
lib/libkvm/Makefile
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@ -18,6 +18,7 @@ SRCS= kvm.c kvm_cptime.c kvm_getloadavg.c \
kvm_i386.c kvm_minidump_i386.c \
kvm_minidump_mips.c \
kvm_powerpc.c kvm_powerpc64.c \
kvm_minidump_riscv.c \
kvm_sparc64.c
INCS= kvm.h

288
lib/libkvm/kvm_minidump_riscv.c Normal file
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@ -0,0 +1,288 @@
/*-
* Copyright (c) 2006 Peter Wemm
* Copyright (c) 2019 Mitchell Horne
*
* 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("$FreeBSD$");
/*
* RISC-V machine dependent routines for kvm and minidumps.
*/
#include <sys/param.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <vm/vm.h>
#include <kvm.h>
#include "../../sys/riscv/include/minidump.h"
#include <limits.h>
#include "kvm_private.h"
#include "kvm_riscv.h"
#define riscv_round_page(x) roundup2((kvaddr_t)(x), RISCV_PAGE_SIZE)
struct vmstate {
struct minidumphdr hdr;
};
static riscv_pt_entry_t
_riscv_pte_get(kvm_t *kd, u_long pteindex)
{
riscv_pt_entry_t *pte = _kvm_pmap_get(kd, pteindex, sizeof(*pte));
return le64toh(*pte);
}
static int
_riscv_minidump_probe(kvm_t *kd)
{
return (_kvm_probe_elf_kernel(kd, ELFCLASS64, EM_RISCV) &&
_kvm_is_minidump(kd));
}
static void
_riscv_minidump_freevtop(kvm_t *kd)
{
struct vmstate *vm = kd->vmst;
free(vm);
kd->vmst = NULL;
}
static int
_riscv_minidump_initvtop(kvm_t *kd)
{
struct vmstate *vmst;
off_t off, sparse_off;
vmst = _kvm_malloc(kd, sizeof(*vmst));
if (vmst == NULL) {
_kvm_err(kd, kd->program, "cannot allocate vm");
return (-1);
}
kd->vmst = vmst;
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);
}
vmst->hdr.version = le32toh(vmst->hdr.version);
if (vmst->hdr.version != MINIDUMP_VERSION) {
_kvm_err(kd, kd->program, "wrong minidump version. "
"Expected %d got %d", MINIDUMP_VERSION, vmst->hdr.version);
return (-1);
}
vmst->hdr.msgbufsize = le32toh(vmst->hdr.msgbufsize);
vmst->hdr.bitmapsize = le32toh(vmst->hdr.bitmapsize);
vmst->hdr.pmapsize = le32toh(vmst->hdr.pmapsize);
vmst->hdr.kernbase = le64toh(vmst->hdr.kernbase);
vmst->hdr.dmapphys = le64toh(vmst->hdr.dmapphys);
vmst->hdr.dmapbase = le64toh(vmst->hdr.dmapbase);
vmst->hdr.dmapend = le64toh(vmst->hdr.dmapend);
/* Skip header and msgbuf */
off = RISCV_PAGE_SIZE + riscv_round_page(vmst->hdr.msgbufsize);
/* build physical address lookup table for sparse pages */
sparse_off = off + riscv_round_page(vmst->hdr.bitmapsize) +
riscv_round_page(vmst->hdr.pmapsize);
if (_kvm_pt_init(kd, vmst->hdr.bitmapsize, off, sparse_off,
RISCV_PAGE_SIZE, sizeof(uint64_t)) == -1) {
return (-1);
}
off += riscv_round_page(vmst->hdr.bitmapsize);
if (_kvm_pmap_init(kd, vmst->hdr.pmapsize, off) == -1) {
return (-1);
}
off += riscv_round_page(vmst->hdr.pmapsize);
return (0);
}
static int
_riscv_minidump_vatop(kvm_t *kd, kvaddr_t va, off_t *pa)
{
struct vmstate *vm;
riscv_physaddr_t offset;
riscv_pt_entry_t l3;
kvaddr_t l3_index;
riscv_physaddr_t a;
off_t ofs;
vm = kd->vmst;
offset = va & RISCV_PAGE_MASK;
if (va >= vm->hdr.dmapbase && va < vm->hdr.dmapend) {
a = (va - vm->hdr.dmapbase + vm->hdr.dmapphys) &
~RISCV_PAGE_MASK;
ofs = _kvm_pt_find(kd, a, RISCV_PAGE_SIZE);
if (ofs == -1) {
_kvm_err(kd, kd->program, "_riscv_minidump_vatop: "
"direct map address 0x%jx not in minidump",
(uintmax_t)va);
goto invalid;
}
*pa = ofs + offset;
return (RISCV_PAGE_SIZE - offset);
} else if (va >= vm->hdr.kernbase) {
l3_index = (va - vm->hdr.kernbase) >> RISCV_L3_SHIFT;
if (l3_index >= vm->hdr.pmapsize / sizeof(l3))
goto invalid;
l3 = _riscv_pte_get(kd, l3_index);
if ((l3 & RISCV_PTE_V) == 0 || (l3 & RISCV_PTE_RWX) == 0) {
_kvm_err(kd, kd->program,
"_riscv_minidump_vatop: pte not valid");
goto invalid;
}
a = (l3 >> RISCV_PTE_PPN0_S) << RISCV_L3_SHIFT;
ofs = _kvm_pt_find(kd, a, RISCV_PAGE_SIZE);
if (ofs == -1) {
_kvm_err(kd, kd->program, "_riscv_minidump_vatop: "
"physical address 0x%jx not in minidump",
(uintmax_t)a);
goto invalid;
}
*pa = ofs + offset;
return (RISCV_PAGE_SIZE - offset);
} else {
_kvm_err(kd, kd->program,
"_riscv_minidump_vatop: virtual address 0x%jx not minidumped",
(uintmax_t)va);
goto invalid;
}
invalid:
_kvm_err(kd, 0, "invalid address (0x%jx)", (uintmax_t)va);
return (0);
}
static int
_riscv_minidump_kvatop(kvm_t *kd, kvaddr_t va, off_t *pa)
{
if (ISALIVE(kd)) {
_kvm_err(kd, 0,
"_riscv_minidump_kvatop called in live kernel!");
return (0);
}
return (_riscv_minidump_vatop(kd, va, pa));
}
static int
_riscv_native(kvm_t *kd __unused)
{
#ifdef __riscv
return (1);
#else
return (0);
#endif
}
static vm_prot_t
_riscv_entry_to_prot(riscv_pt_entry_t pte)
{
vm_prot_t prot = VM_PROT_READ;
if ((pte & RISCV_PTE_W) != 0)
prot |= VM_PROT_WRITE;
if ((pte & RISCV_PTE_X) != 0)
prot |= VM_PROT_EXECUTE;
return prot;
}
static int
_riscv_minidump_walk_pages(kvm_t *kd, kvm_walk_pages_cb_t *cb, void *arg)
{
struct vmstate *vm = kd->vmst;
u_long nptes = vm->hdr.pmapsize / sizeof(riscv_pt_entry_t);
u_long bmindex, dva, pa, pteindex, va;
struct kvm_bitmap bm;
vm_prot_t prot;
int ret = 0;
if (!_kvm_bitmap_init(&bm, vm->hdr.bitmapsize, &bmindex))
return (0);
for (pteindex = 0; pteindex < nptes; pteindex++) {
riscv_pt_entry_t pte = _riscv_pte_get(kd, pteindex);
if (((pte & RISCV_PTE_V) == 0) ||
((pte & RISCV_PTE_RWX) == 0))
continue;
va = vm->hdr.kernbase + (pteindex << RISCV_L3_SHIFT);
pa = (pte >> RISCV_PTE_PPN0_S) << RISCV_L3_SHIFT;
dva = vm->hdr.dmapbase + pa;
if (!_kvm_visit_cb(kd, cb, arg, pa, va, dva,
_riscv_entry_to_prot(pte), RISCV_PAGE_SIZE, 0)) {
goto out;
}
}
while (_kvm_bitmap_next(&bm, &bmindex)) {
pa = bmindex * RISCV_PAGE_SIZE;
dva = vm->hdr.dmapbase + pa;
if (vm->hdr.dmapend < (dva + RISCV_PAGE_SIZE))
break;
va = 0;
prot = VM_PROT_READ | VM_PROT_WRITE;
if (!_kvm_visit_cb(kd, cb, arg, pa, va, dva,
prot, RISCV_PAGE_SIZE, 0)) {
goto out;
}
}
ret = 1;
out:
_kvm_bitmap_deinit(&bm);
return (ret);
}
static struct kvm_arch kvm_riscv_minidump = {
.ka_probe = _riscv_minidump_probe,
.ka_initvtop = _riscv_minidump_initvtop,
.ka_freevtop = _riscv_minidump_freevtop,
.ka_kvatop = _riscv_minidump_kvatop,
.ka_native = _riscv_native,
.ka_walk_pages = _riscv_minidump_walk_pages,
};
KVM_ARCH(kvm_riscv_minidump);

90
lib/libkvm/kvm_riscv.h Normal file
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@ -0,0 +1,90 @@
/*-
* Copyright (c) 2015 John H. Baldwin <jhb@FreeBSD.org>
* Copyright (c) 2019 Mitchell Horne
* 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.
*
* $FreeBSD$
*/
#ifndef __KVM_RISCV_H__
#define __KVM_RISCV_H__
#ifdef __riscv
#include <machine/pte.h>
#endif
typedef uint64_t riscv_physaddr_t;
typedef uint64_t riscv_pt_entry_t;
#define RISCV_PAGE_SHIFT 12
#define RISCV_PAGE_SIZE (1 << RISCV_PAGE_SHIFT)
#define RISCV_PAGE_MASK (RISCV_PAGE_SIZE - 1)
/* Source: sys/riscv/include/pte.h */
#define RISCV_L3_SHIFT 12
#define RISCV_L3_SIZE (1 << L3_SHIFT)
#define RISCV_L3_OFFSET (L3_SIZE - 1)
#define RISCV_PTE_SW_MANAGED (1 << 9)
#define RISCV_PTE_SW_WIRED (1 << 8)
#define RISCV_PTE_D (1 << 7) /* Dirty */
#define RISCV_PTE_A (1 << 6) /* Accessed */
#define RISCV_PTE_G (1 << 5) /* Global */
#define RISCV_PTE_U (1 << 4) /* User */
#define RISCV_PTE_X (1 << 3) /* Execute */
#define RISCV_PTE_W (1 << 2) /* Write */
#define RISCV_PTE_R (1 << 1) /* Read */
#define RISCV_PTE_V (1 << 0) /* Valid */
#define RISCV_PTE_RWX (RISCV_PTE_R | RISCV_PTE_W | RISCV_PTE_X)
#define RISCV_PTE_PPN0_S 10
#ifdef __riscv
_Static_assert(sizeof(pt_entry_t) == sizeof(riscv_pt_entry_t),
"pt_entry_t size mismatch");
_Static_assert(PAGE_SHIFT == RISCV_PAGE_SHIFT, "PAGE_SHIFT mismatch");
_Static_assert(PAGE_SIZE == RISCV_PAGE_SIZE, "PAGE_SIZE mismatch");
_Static_assert(PAGE_MASK == RISCV_PAGE_MASK, "PAGE_MASK mismatch");
_Static_assert(L3_SHIFT == RISCV_L3_SHIFT, "L3_SHIFT mismatch");
_Static_assert(L3_SIZE == RISCV_L3_SIZE, "L3_SIZE mismatch");
_Static_assert(L3_OFFSET == RISCV_L3_OFFSET, "L3_OFFSET mismatch");
_Static_assert(PTE_PPN0_S == RISCV_PTE_PPN0_S, "PTE_PPN0_S mismatch");
_Static_assert(PTE_SW_MANAGED == RISCV_PTE_SW_MANAGED,
"PTE_SW_MANAGED mismatch");
_Static_assert(PTE_SW_WIRED == RISCV_PTE_SW_WIRED, "PTE_SW_WIRED mismatch");
_Static_assert(PTE_D == RISCV_PTE_D, "PTE_D mismatch");
_Static_assert(PTE_A == RISCV_PTE_A, "PTE_A mismatch");
_Static_assert(PTE_G == RISCV_PTE_G, "PTE_G mismatch");
_Static_assert(PTE_U == RISCV_PTE_U, "PTE_U mismatch");
_Static_assert(PTE_X == RISCV_PTE_X, "PTE_X mismatch");
_Static_assert(PTE_W == RISCV_PTE_W, "PTE_W mismatch");
_Static_assert(PTE_R == RISCV_PTE_R, "PTE_R mismatch");
_Static_assert(PTE_V == RISCV_PTE_V, "PTE_V mismatch");
_Static_assert(PTE_RWX == RISCV_PTE_RWX, "PTE_RWX mismatch");
#endif
#endif /* !__KVM_RISCV_H__ */