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Differential D18894 Diff 52999 sys/i386/i386/minidump_machdep.c

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sys/i386/i386/minidump_machdep.c

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#include <machine/atomic.h> #include <machine/atomic.h>
#include <machine/elf.h> #include <machine/elf.h>
#include <machine/md_var.h> #include <machine/md_var.h>
#include <machine/vmparam.h> #include <machine/vmparam.h>
#include <machine/minidump.h> #include <machine/minidump.h>
CTASSERT(sizeof(struct kerneldumpheader) == 512); CTASSERT(sizeof(struct kerneldumpheader) == 512);
#define MD_ALIGN(x) (((off_t)(x) + PAGE_MASK) & ~PAGE_MASK)
#define DEV_ALIGN(x) roundup2((off_t)(x), DEV_BSIZE)
uint32_t *vm_page_dump; uint32_t *vm_page_dump;
int vm_page_dump_size; int vm_page_dump_size;
static struct kerneldumpheader kdh;
/* Handle chunked writes. */
static size_t fragsz;
static void *dump_va;
static uint64_t counter, progress;
CTASSERT(sizeof(*vm_page_dump) == 4); CTASSERT(sizeof(*vm_page_dump) == 4);
static int
is_dumpable(vm_paddr_t pa)
{
int i;
for (i = 0; dump_avail[i] != 0 || dump_avail[i + 1] != 0; i += 2) {
if (pa >= dump_avail[i] && pa < dump_avail[i + 1])
return (1);
}
return (0);
}
#define PG2MB(pgs) (((pgs) + (1 << 8) - 1) >> 8)
static int
blk_flush(struct dumperinfo *di)
{
int error;
if (fragsz == 0)
return (0);
error = dump_append(di, dump_va, 0, fragsz);
fragsz = 0;
return (error);
}
static int
blk_write(struct dumperinfo *di, char *ptr, vm_paddr_t pa, size_t sz)
{
size_t len;
int error, i, c;
u_int maxdumpsz;
maxdumpsz = min(di->maxiosize, MAXDUMPPGS * PAGE_SIZE);
if (maxdumpsz == 0) /* seatbelt */
maxdumpsz = PAGE_SIZE;
error = 0;
if ((sz % PAGE_SIZE) != 0) {
printf("size not page aligned\n");
return (EINVAL);
}
if (ptr != NULL && pa != 0) {
printf("cant have both va and pa!\n");
return (EINVAL);
}
if (pa != 0 && (((uintptr_t)ptr) % PAGE_SIZE) != 0) {
printf("address not page aligned\n");
return (EINVAL);
}
if (ptr != NULL) {
/* If we're doing a virtual dump, flush any pre-existing pa pages */
error = blk_flush(di);
if (error)
return (error);
}
while (sz) {
len = maxdumpsz - fragsz;
if (len > sz)
len = sz;
counter += len;
progress -= len;
if (counter >> 24) {
printf(" %lld", PG2MB(progress >> PAGE_SHIFT));
counter &= (1<<24) - 1;
}
wdog_kern_pat(WD_LASTVAL);
if (ptr) {
error = dump_append(di, ptr, 0, len);
if (error)
return (error);
ptr += len;
sz -= len;
} else {
for (i = 0; i < len; i += PAGE_SIZE)
dump_va = pmap_kenter_temporary(pa + i, (i + fragsz) >> PAGE_SHIFT);
fragsz += len;
pa += len;
sz -= len;
if (fragsz == maxdumpsz) {
error = blk_flush(di);
if (error)
return (error);
}
}
/* Check for user abort. */
c = cncheckc();
if (c == 0x03)
return (ECANCELED);
if (c != -1)
printf(" (CTRL-C to abort) ");
}
return (0);
}
/* A fake page table page, to avoid having to handle both 4K and 2M pages */
static pt_entry_t fakept[NPTEPG];
int
minidumpsys(struct dumperinfo *di)
{
uint64_t dumpsize;
uint32_t ptesize;
vm_offset_t va;
int error;
uint32_t bits;
uint64_t pa;
pd_entry_t *pd;
pt_entry_t *pt;
int i, j, k, bit;
struct minidumphdr mdhdr;
counter = 0;
/* Walk page table pages, set bits in vm_page_dump */
ptesize = 0;
for (va = KERNBASE; va < kernel_vm_end; va += NBPDR) {
/*
* We always write a page, even if it is zero. Each
* page written corresponds to 2MB of space
*/
ptesize += PAGE_SIZE;
pd = IdlePTD; /* always mapped! */
j = va >> PDRSHIFT;
if ((pd[j] & (PG_PS | PG_V)) == (PG_PS | PG_V)) {
/* This is an entire 2M page. */
pa = pd[j] & PG_PS_FRAME;
for (k = 0; k < NPTEPG; k++) {
if (is_dumpable(pa))
dump_add_page(pa);
pa += PAGE_SIZE;
}
continue;
}
if ((pd[j] & PG_V) == PG_V) {
/* set bit for each valid page in this 2MB block */
pt = pmap_kenter_temporary(pd[j] & PG_FRAME, 0);
for (k = 0; k < NPTEPG; k++) {
if ((pt[k] & PG_V) == PG_V) {
pa = pt[k] & PG_FRAME;
if (is_dumpable(pa))
dump_add_page(pa);
}
}
} else {
/* nothing, we're going to dump a null page */
}
}
/* Calculate dump size. */
dumpsize = ptesize;
dumpsize += round_page(msgbufp->msg_size);
dumpsize += round_page(vm_page_dump_size);
for (i = 0; i < vm_page_dump_size / sizeof(*vm_page_dump); i++) {
bits = vm_page_dump[i];
while (bits) {
bit = bsfl(bits);
pa = (((uint64_t)i * sizeof(*vm_page_dump) * NBBY) + bit) * PAGE_SIZE;
/* Clear out undumpable pages now if needed */
if (is_dumpable(pa)) {
dumpsize += PAGE_SIZE;
} else {
dump_drop_page(pa);
}
bits &= ~(1ul << bit);
}
}
dumpsize += PAGE_SIZE;
progress = dumpsize;
/* Initialize mdhdr */
bzero(&mdhdr, sizeof(mdhdr));
strcpy(mdhdr.magic, MINIDUMP_MAGIC);
mdhdr.version = MINIDUMP_VERSION;
mdhdr.msgbufsize = msgbufp->msg_size;
mdhdr.bitmapsize = vm_page_dump_size;
mdhdr.ptesize = ptesize;
mdhdr.kernbase = KERNBASE;
#if defined(PAE) || defined(PAE_TABLES)
mdhdr.paemode = 1;
#endif
dump_init_header(di, &kdh, KERNELDUMPMAGIC, KERNELDUMP_I386_VERSION,
dumpsize);
error = dump_start(di, &kdh);
if (error != 0)
goto fail;
printf("Physical memory: %ju MB\n", ptoa((uintmax_t)physmem) / 1048576);
printf("Dumping %llu MB:", (long long)dumpsize >> 20);
/* Dump my header */
bzero(&fakept, sizeof(fakept));
bcopy(&mdhdr, &fakept, sizeof(mdhdr));
error = blk_write(di, (char *)&fakept, 0, PAGE_SIZE);
if (error)
goto fail;
/* Dump msgbuf up front */
error = blk_write(di, (char *)msgbufp->msg_ptr, 0, round_page(msgbufp->msg_size));
if (error)
goto fail;
/* Dump bitmap */
error = blk_write(di, (char *)vm_page_dump, 0, round_page(vm_page_dump_size));
if (error)
goto fail;
/* Dump kernel page table pages */
for (va = KERNBASE; va < kernel_vm_end; va += NBPDR) {
/* We always write a page, even if it is zero */
pd = IdlePTD; /* always mapped! */
j = va >> PDRSHIFT;
if ((pd[j] & (PG_PS | PG_V)) == (PG_PS | PG_V)) {
/* This is a single 2M block. Generate a fake PTP */
pa = pd[j] & PG_PS_FRAME;
for (k = 0; k < NPTEPG; k++) {
fakept[k] = (pa + (k * PAGE_SIZE)) | PG_V | PG_RW | PG_A | PG_M;
}
error = blk_write(di, (char *)&fakept, 0, PAGE_SIZE);
if (error)
goto fail;
/* flush, in case we reuse fakept in the same block */
error = blk_flush(di);
if (error)
goto fail;
continue;
}
if ((pd[j] & PG_V) == PG_V) {
pa = pd[j] & PG_FRAME;
error = blk_write(di, 0, pa, PAGE_SIZE);
if (error)
goto fail;
} else {
bzero(fakept, sizeof(fakept));
error = blk_write(di, (char *)&fakept, 0, PAGE_SIZE);
if (error)
goto fail;
/* flush, in case we reuse fakept in the same block */
error = blk_flush(di);
if (error)
goto fail;
}
}
/* Dump memory chunks */
/* XXX cluster it up and use blk_dump() */
for (i = 0; i < vm_page_dump_size / sizeof(*vm_page_dump); i++) {
bits = vm_page_dump[i];
while (bits) {
bit = bsfl(bits);
pa = (((uint64_t)i * sizeof(*vm_page_dump) * NBBY) + bit) * PAGE_SIZE;
error = blk_write(di, 0, pa, PAGE_SIZE);
if (error)
goto fail;
bits &= ~(1ul << bit);
}
}
error = blk_flush(di);
if (error)
goto fail;
error = dump_finish(di, &kdh);
if (error != 0)
goto fail;
printf("\nDump complete\n");
return (0);
fail:
if (error < 0)
error = -error;
if (error == ECANCELED)
printf("\nDump aborted\n");
else if (error == E2BIG || error == ENOSPC)
printf("\nDump failed. Partition too small.\n");
else
printf("\n** DUMP FAILED (ERROR %d) **\n", error);
return (error);
}
void void
dump_add_page(vm_paddr_t pa) dump_add_page(vm_paddr_t pa)
{ {
int idx, bit; int idx, bit;
pa >>= PAGE_SHIFT; pa >>= PAGE_SHIFT;
idx = pa >> 5; /* 2^5 = 32 */ idx = pa >> 5; /* 2^5 = 32 */
bit = pa & 31; bit = pa & 31;
atomic_set_int(&vm_page_dump[idx], 1ul << bit); atomic_set_int(&vm_page_dump[idx], 1ul << bit);
} }
void void
dump_drop_page(vm_paddr_t pa) dump_drop_page(vm_paddr_t pa)
{ {
int idx, bit; int idx, bit;
pa >>= PAGE_SHIFT; pa >>= PAGE_SHIFT;
idx = pa >> 5; /* 2^5 = 32 */ idx = pa >> 5; /* 2^5 = 32 */
bit = pa & 31; bit = pa & 31;
atomic_clear_int(&vm_page_dump[idx], 1ul << bit); atomic_clear_int(&vm_page_dump[idx], 1ul << bit);
}
int
minidumpsys(struct dumperinfo *di)
{
return (pae_mode ? minidumpsys_pae(di) : minidumpsys_nopae(di));
} }