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Differential D3341 Diff 7906 lib/libkvm/kvm_minidump_arm.c

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lib/libkvm/kvm_minidump_arm.c

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#include <sys/cdefs.h> #include <sys/cdefs.h>
__FBSDID("$FreeBSD$"); __FBSDID("$FreeBSD$");
/* /*
* ARM machine dependent routines for kvm and minidumps. * ARM machine dependent routines for kvm and minidumps.
*/ */
#include <sys/endian.h>
#include <sys/param.h> #include <sys/param.h>
#ifndef CROSS_LIBKVM #include <kvm.h>
#include <sys/user.h> #include <limits.h>
#endif #include <stdint.h>
#include <sys/proc.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include <sys/fnv_hash.h>
#include <stdlib.h> #include <stdlib.h>
#include <string.h> #include <string.h>
#include <unistd.h> #include <unistd.h>
#include <nlist.h>
#include <kvm.h>
#ifndef CROSS_LIBKVM
#include <vm/vm.h>
#include <vm/vm_param.h>
#include <machine/elf.h>
#include <machine/cpufunc.h>
#include <machine/minidump.h>
#else
#include "../../sys/arm/include/pte.h"
#include "../../sys/arm/include/vmparam.h"
#include "../../sys/arm/include/minidump.h" #include "../../sys/arm/include/minidump.h"
#endif
#include <limits.h>
#include "kvm_private.h" #include "kvm_private.h"
#include "kvm_arm.h"
struct hpte { #define arm_round_page(x) roundup2((kvaddr_t)(x), ARM_PAGE_SIZE)
struct hpte *next;
uint64_t pa;
int64_t off;
};
#define HPT_SIZE 1024
/* minidump must be the first field */
struct vmstate { struct vmstate {
int minidump; /* 1 = minidump mode */
struct minidumphdr hdr; struct minidumphdr hdr;
void *hpt_head[HPT_SIZE]; struct hpt hpt;
uint32_t *bitmap;
void *ptemap; void *ptemap;
unsigned char ei_data;
}; };
static void
hpt_insert(kvm_t *kd, uint64_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, uint64_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 static int
inithash(kvm_t *kd, uint32_t *base, int len, off_t off) _arm_minidump_probe(kvm_t *kd)
{ {
uint64_t idx, pa;
uint32_t bit, bits;
for (idx = 0; idx < len / sizeof(*base); idx++) { return (_kvm_probe_elf_kernel(kd, ELFCLASS32, EM_ARM) &&
bits = base[idx]; _kvm_is_minidump(kd));
while (bits) {
bit = ffs(bits) - 1;
bits &= ~(1ul << bit);
pa = (idx * sizeof(*base) * NBBY + bit) * PAGE_SIZE;
hpt_insert(kd, pa, off);
off += PAGE_SIZE;
} }
}
return (off);
}
void static void
_kvm_minidump_freevtop(kvm_t *kd) _arm_minidump_freevtop(kvm_t *kd)
{ {
struct vmstate *vm = kd->vmst; struct vmstate *vm = kd->vmst;
if (vm->bitmap) _kvm_hpt_free(&vm->hpt);
free(vm->bitmap);
if (vm->ptemap) if (vm->ptemap)
free(vm->ptemap); free(vm->ptemap);
free(vm); free(vm);
kd->vmst = NULL; kd->vmst = NULL;
} }
int static int
_kvm_minidump_initvtop(kvm_t *kd) _arm_minidump_initvtop(kvm_t *kd)
{ {
struct vmstate *vmst; struct vmstate *vmst;
uint32_t *bitmap;
off_t off; off_t off;
vmst = _kvm_malloc(kd, sizeof(*vmst)); vmst = _kvm_malloc(kd, sizeof(*vmst));
if (vmst == 0) { if (vmst == 0) {
_kvm_err(kd, kd->program, "cannot allocate vm"); _kvm_err(kd, kd->program, "cannot allocate vm");
return (-1); return (-1);
} }
kd->vmst = vmst; kd->vmst = vmst;
vmst->minidump = 1;
if (pread(kd->pmfd, &vmst->hdr, if (pread(kd->pmfd, &vmst->hdr,
sizeof(vmst->hdr), 0) != sizeof(vmst->hdr)) { sizeof(vmst->hdr), 0) != sizeof(vmst->hdr)) {
_kvm_err(kd, kd->program, "cannot read dump header"); _kvm_err(kd, kd->program, "cannot read dump header");
return (-1); return (-1);
} }
if (strncmp(MINIDUMP_MAGIC, vmst->hdr.magic, if (strncmp(MINIDUMP_MAGIC, vmst->hdr.magic,
sizeof(vmst->hdr.magic)) != 0) { sizeof(vmst->hdr.magic)) != 0) {
_kvm_err(kd, kd->program, "not a minidump for this platform"); _kvm_err(kd, kd->program, "not a minidump for this platform");
return (-1); return (-1);
} }
vmst->hdr.version = _kvm32toh(kd, vmst->hdr.version);
if (vmst->hdr.version != MINIDUMP_VERSION) { if (vmst->hdr.version != MINIDUMP_VERSION) {
_kvm_err(kd, kd->program, "wrong minidump version. " _kvm_err(kd, kd->program, "wrong minidump version. "
"Expected %d got %d", MINIDUMP_VERSION, vmst->hdr.version); "Expected %d got %d", MINIDUMP_VERSION, vmst->hdr.version);
return (-1); return (-1);
} }
vmst->hdr.msgbufsize = _kvm32toh(kd, vmst->hdr.msgbufsize);
vmst->hdr.bitmapsize = _kvm32toh(kd, vmst->hdr.bitmapsize);
vmst->hdr.ptesize = _kvm32toh(kd, vmst->hdr.ptesize);
vmst->hdr.kernbase = _kvm32toh(kd, vmst->hdr.kernbase);
/* Skip header and msgbuf */ /* Skip header and msgbuf */
off = PAGE_SIZE + round_page(vmst->hdr.msgbufsize); off = ARM_PAGE_SIZE + arm_round_page(vmst->hdr.msgbufsize);
vmst->bitmap = _kvm_malloc(kd, vmst->hdr.bitmapsize); bitmap = _kvm_malloc(kd, vmst->hdr.bitmapsize);
if (vmst->bitmap == NULL) { if (bitmap == NULL) {
_kvm_err(kd, kd->program, "cannot allocate %d bytes for " _kvm_err(kd, kd->program, "cannot allocate %d bytes for "
"bitmap", vmst->hdr.bitmapsize); "bitmap", vmst->hdr.bitmapsize);
return (-1); return (-1);
} }
if (pread(kd->pmfd, vmst->bitmap, vmst->hdr.bitmapsize, off) != if (pread(kd->pmfd, bitmap, vmst->hdr.bitmapsize, off) !=
(ssize_t)vmst->hdr.bitmapsize) { (ssize_t)vmst->hdr.bitmapsize) {
_kvm_err(kd, kd->program, "cannot read %d bytes for page bitmap", _kvm_err(kd, kd->program, "cannot read %d bytes for page bitmap",
vmst->hdr.bitmapsize); vmst->hdr.bitmapsize);
free(bitmap);
return (-1); return (-1);
} }
off += round_page(vmst->hdr.bitmapsize); off += arm_round_page(vmst->hdr.bitmapsize);
vmst->ptemap = _kvm_malloc(kd, vmst->hdr.ptesize); vmst->ptemap = _kvm_malloc(kd, vmst->hdr.ptesize);
if (vmst->ptemap == NULL) { if (vmst->ptemap == NULL) {
_kvm_err(kd, kd->program, "cannot allocate %d bytes for " _kvm_err(kd, kd->program, "cannot allocate %d bytes for "
"ptemap", vmst->hdr.ptesize); "ptemap", vmst->hdr.ptesize);
free(bitmap);
return (-1); return (-1);
} }
if (pread(kd->pmfd, vmst->ptemap, vmst->hdr.ptesize, off) != if (pread(kd->pmfd, vmst->ptemap, vmst->hdr.ptesize, off) !=
(ssize_t)vmst->hdr.ptesize) { (ssize_t)vmst->hdr.ptesize) {
_kvm_err(kd, kd->program, "cannot read %d bytes for ptemap", _kvm_err(kd, kd->program, "cannot read %d bytes for ptemap",
vmst->hdr.ptesize); vmst->hdr.ptesize);
free(bitmap);
return (-1); return (-1);
} }
off += vmst->hdr.ptesize; off += vmst->hdr.ptesize;
/* Build physical address hash table for sparse pages */ /* Build physical address hash table for sparse pages */
inithash(kd, vmst->bitmap, vmst->hdr.bitmapsize, off); _kvm_hpt_init(kd, &vmst->hpt, bitmap, vmst->hdr.bitmapsize, off,
ARM_PAGE_SIZE, sizeof(*bitmap));
free(bitmap);
return (0); return (0);
} }
int static int
_kvm_minidump_kvatop(kvm_t *kd, u_long va, off_t *pa) _arm_minidump_kvatop(kvm_t *kd, kvaddr_t va, off_t *pa)
{ {
struct vmstate *vm; struct vmstate *vm;
pt_entry_t pte; arm_pt_entry_t pte;
u_long offset, pteindex, a; arm_physaddr_t offset, a;
kvaddr_t pteindex;
off_t ofs; off_t ofs;
uint32_t *ptemap; arm_pt_entry_t *ptemap;
if (ISALIVE(kd)) { if (ISALIVE(kd)) {
_kvm_err(kd, 0, "kvm_kvatop called in live kernel!"); _kvm_err(kd, 0, "_arm_minidump_kvatop called in live kernel!");
return (0); return (0);
} }
vm = kd->vmst; vm = kd->vmst;
ptemap = vm->ptemap; ptemap = vm->ptemap;
if (va >= vm->hdr.kernbase) { if (va >= vm->hdr.kernbase) {
pteindex = (va - vm->hdr.kernbase) >> PAGE_SHIFT; pteindex = (va - vm->hdr.kernbase) >> ARM_PAGE_SHIFT;
pte = ptemap[pteindex]; pte = _kvm32toh(kd, ptemap[pteindex]);
if (!pte) { if (!pte) {
_kvm_err(kd, kd->program, "_kvm_vatop: pte not valid"); _kvm_err(kd, kd->program,
"_arm_minidump_kvatop: pte not valid");
goto invalid; goto invalid;
} }
if ((pte & L2_TYPE_MASK) == L2_TYPE_L) { if ((pte & ARM_L2_TYPE_MASK) == ARM_L2_TYPE_L) {
offset = va & L2_L_OFFSET; offset = va & ARM_L2_L_OFFSET;
a = pte & L2_L_FRAME; a = pte & ARM_L2_L_FRAME;
} else if ((pte & L2_TYPE_MASK) == L2_TYPE_S) { } else if ((pte & ARM_L2_TYPE_MASK) == ARM_L2_TYPE_S) {
offset = va & L2_S_OFFSET; offset = va & ARM_L2_S_OFFSET;
a = pte & L2_S_FRAME; a = pte & ARM_L2_S_FRAME;
} else } else
goto invalid; goto invalid;
ofs = hpt_find(kd, a); ofs = _kvm_hpt_find(&vm->hpt, a);
if (ofs == -1) { if (ofs == -1) {
_kvm_err(kd, kd->program, "_kvm_vatop: physical " _kvm_err(kd, kd->program, "_arm_minidump_kvatop: "
"address 0x%lx not in minidump", a); "physical address 0x%jx not in minidump",
(uintmax_t)a);
goto invalid; goto invalid;
} }
*pa = ofs + offset; *pa = ofs + offset;
return (PAGE_SIZE - offset); return (ARM_PAGE_SIZE - offset);
} else } else
_kvm_err(kd, kd->program, "_kvm_vatop: virtual address 0x%lx " _kvm_err(kd, kd->program, "_arm_minidump_kvatop: virtual "
"not minidumped", va); "address 0x%jx not minidumped", (uintmax_t)va);
invalid: invalid:
_kvm_err(kd, 0, "invalid address (0x%lx)", va); _kvm_err(kd, 0, "invalid address (0x%jx)", (uintmax_t)va);
return (0); return (0);
} }
struct kvm_arch kvm_arm_minidump = {
.ka_probe = _arm_minidump_probe,
.ka_initvtop = _arm_minidump_initvtop,
.ka_freevtop = _arm_minidump_freevtop,
.ka_kvatop = _arm_minidump_kvatop,
.ka_native = _arm_native,
};
KVM_ARCH(kvm_arm_minidump);