Differential D11584 Diff 30745 sys/amd64/amd64/minidump_machdep.c

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sys/amd64/amd64/minidump_machdep.c

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#include <vm/pmap.h>		#include <vm/pmap.h>
#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/minidump.h>		#include <machine/minidump.h>

CTASSERT(sizeof(struct kerneldumpheader) == 512);		CTASSERT(sizeof(struct kerneldumpheader) == 512);

/*
* Don't touch the first SIZEOF_METADATA bytes on the dump device. This
* is to protect us from metadata and to protect metadata from us.
*/
#define SIZEOF_METADATA (64*1024)

uint64_t *vm_page_dump;		uint64_t *vm_page_dump;
int vm_page_dump_size;		int vm_page_dump_size;

static struct kerneldumpheader kdh;		static struct kerneldumpheader kdh;
static off_t dumplo;		static off_t dumplo;

/* Handle chunked writes. */		/* Handle chunked writes. */
static size_t fragsz;		static size_t fragsz;
▲ Show 20 Lines • Show All 246 Lines • ▼ Show 20 Lines	while (bits) {
} else {		} else {
dump_drop_page(pa);		dump_drop_page(pa);
}		}
bits &= ~(1ul << bit);		bits &= ~(1ul << bit);
}		}
}		}
dumpsize += PAGE_SIZE;		dumpsize += PAGE_SIZE;

/* Determine dump offset on device. */
if (di->mediasize < SIZEOF_METADATA + dumpsize + di->blocksize * 2 +
kerneldumpcrypto_dumpkeysize(di->kdc)) {
error = E2BIG;
goto fail;
}
dumplo = di->mediaoffset + di->mediasize - dumpsize;
dumplo -= di->blocksize * 2;
dumplo -= kerneldumpcrypto_dumpkeysize(di->kdc);
progress = dumpsize;		progress = dumpsize;

/* Initialize kernel dump crypto. */
error = kerneldumpcrypto_init(di->kdc);
if (error)
goto fail;

/* Initialize mdhdr */		/* Initialize mdhdr */
bzero(&mdhdr, sizeof(mdhdr));		bzero(&mdhdr, sizeof(mdhdr));
strcpy(mdhdr.magic, MINIDUMP_MAGIC);		strcpy(mdhdr.magic, MINIDUMP_MAGIC);
mdhdr.version = MINIDUMP_VERSION;		mdhdr.version = MINIDUMP_VERSION;
mdhdr.msgbufsize = msgbufp->msg_size;		mdhdr.msgbufsize = msgbufp->msg_size;
mdhdr.bitmapsize = vm_page_dump_size;		mdhdr.bitmapsize = vm_page_dump_size;
mdhdr.pmapsize = pmapsize;		mdhdr.pmapsize = pmapsize;
mdhdr.kernbase = VM_MIN_KERNEL_ADDRESS;		mdhdr.kernbase = VM_MIN_KERNEL_ADDRESS;
mdhdr.dmapbase = DMAP_MIN_ADDRESS;		mdhdr.dmapbase = DMAP_MIN_ADDRESS;
mdhdr.dmapend = DMAP_MAX_ADDRESS;		mdhdr.dmapend = DMAP_MAX_ADDRESS;

mkdumpheader(&kdh, KERNELDUMPMAGIC, KERNELDUMP_AMD64_VERSION, dumpsize,		mkdumpheader(&kdh, KERNELDUMPMAGIC, KERNELDUMP_AMD64_VERSION, dumpsize,
kerneldumpcrypto_dumpkeysize(di->kdc), di->blocksize);		kerneldumpcrypto_dumpkeysize(di->kdc), di->blocksize);

printf("Dumping %llu out of %ju MB:", (long long)dumpsize >> 20,		printf("Dumping %llu out of %ju MB:", (long long)dumpsize >> 20,
ptoa((uintmax_t)physmem) / 1048576);		ptoa((uintmax_t)physmem) / 1048576);

/* Dump leader */		error = dump_start(di, &kdh, &dumplo);
error = dump_write_header(di, &kdh, 0, dumplo);		if (error != 0)
if (error)
goto fail;		goto fail;
dumplo += di->blocksize;

/* Dump key */
error = dump_write_key(di, 0, dumplo);
if (error)
goto fail;
dumplo += kerneldumpcrypto_dumpkeysize(di->kdc);

/* Dump my header */		/* Dump my header */
bzero(&fakepd, sizeof(fakepd));		bzero(&fakepd, sizeof(fakepd));
bcopy(&mdhdr, &fakepd, sizeof(mdhdr));		bcopy(&mdhdr, &fakepd, sizeof(mdhdr));
error = blk_write(di, (char *)&fakepd, 0, PAGE_SIZE);		error = blk_write(di, (char *)&fakepd, 0, PAGE_SIZE);
if (error)		if (error)
goto fail;		goto fail;

/* Dump msgbuf up front */		/* Dump msgbuf up front */
▲ Show 20 Lines • Show All 66 Lines • ▼ Show 20 Lines	while (bits) {
bits &= ~(1ul << bit);		bits &= ~(1ul << bit);
}		}
}		}

error = blk_flush(di);		error = blk_flush(di);
if (error)		if (error)
goto fail;		goto fail;

/* Dump trailer */		error = dump_finish(di, &kdh, dumplo);
error = dump_write_header(di, &kdh, 0, dumplo);		if (error != 0)
if (error)
goto fail;		goto fail;
dumplo += di->blocksize;

/* Signal completion, signoff and exit stage left. */
dump_write(di, NULL, 0, 0, 0);
printf("\nDump complete\n");		printf("\nDump complete\n");
return (0);		return (0);

fail:		fail:
if (error < 0)		if (error < 0)
error = -error;		error = -error;

printf("\n");		printf("\n");
if (error == ENOSPC) {		if (error == ENOSPC) {
printf("Dump map grown while dumping. ");		printf("Dump map grown while dumping. ");
if (retry_count < dump_retry_count) {		if (retry_count < dump_retry_count) {
printf("Retrying...\n");		printf("Retrying...\n");
goto retry;		goto retry;
}		}
printf("Dump failed.\n");		printf("Dump failed.\n");
}		}
else if (error == ECANCELED)		else if (error == ECANCELED)
printf("Dump aborted\n");		printf("Dump aborted\n");
else if (error == E2BIG)		else if (error == E2BIG)
		defUnsubmitted Not Done Inline Actions ENOSPC case is handled before. :) def: ENOSPC case is handled before. :)
printf("Dump failed. Partition too small.\n");		printf("Dump failed. Partition too small.\n");
else		else
printf(" DUMP FAILED (ERROR %d) \n", error);		printf(" DUMP FAILED (ERROR %d) \n", error);
return (error);		return (error);
}		}

void		void
dump_add_page(vm_paddr_t pa)		dump_add_page(vm_paddr_t pa)
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