mirror of
https://github.com/freebsd/freebsd-src
synced 2024-09-06 17:18:32 +00:00
![Mark Johnston](/assets/img/avatar_default.png)
As of r365978, minidumps include a copy of dump_avail[]. This is an array of vm_paddr_t ranges. libkvm walks the array assuming that sizeof(vm_paddr_t) is equal to the platform "word size", but that's not correct on some platforms. For instance, i386 uses a 64-bit vm_paddr_t. Fix the problem by always dumping 64-bit addresses. On platforms where vm_paddr_t is 32 bits wide, namely arm and mips (sometimes), translate dump_avail[] to an array of uint64_t ranges. With this change, libkvm no longer needs to maintain a notion of the target word size, so get rid of it. This is a no-op on platforms where sizeof(vm_paddr_t) == 8. Reviewed by: alc, kib Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D27082
296 lines
7.8 KiB
C
296 lines
7.8 KiB
C
/*-
|
|
* 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, dump_avail_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 && vmst->hdr.version != 1) {
|
|
_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);
|
|
vmst->hdr.dumpavailsize = vmst->hdr.version == MINIDUMP_VERSION ?
|
|
le32toh(vmst->hdr.dumpavailsize) : 0;
|
|
|
|
/* Skip header and msgbuf */
|
|
dump_avail_off = RISCV_PAGE_SIZE + riscv_round_page(vmst->hdr.msgbufsize);
|
|
|
|
/* Skip dump_avail */
|
|
off = dump_avail_off + riscv_round_page(vmst->hdr.dumpavailsize);
|
|
|
|
/* 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.dumpavailsize, dump_avail_off,
|
|
vmst->hdr.bitmapsize, off, sparse_off, RISCV_PAGE_SIZE) == -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 = _kvm_bit_id_pa(kd, bmindex, RISCV_PAGE_SIZE);
|
|
if (pa == _KVM_PA_INVALID)
|
|
break;
|
|
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);
|