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

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sys/arm/arm/minidump_machdep.c

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#include <machine/cpu.h> #include <machine/cpu.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>
#include <machine/vmparam.h> #include <machine/vmparam.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)
uint32_t *vm_page_dump; uint32_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. */
▲ Show 20 Lines • Show All 144 Lines • ▼ Show 20 Lines if (pa != 0 && is_dumpable(pa))
dump_add_page(pa); dump_add_page(pa);
ptesize += sizeof(pt2_entry_t); ptesize += sizeof(pt2_entry_t);
} }
/* Calculate dump size. */ /* Calculate dump size. */
dumpsize = ptesize; dumpsize = ptesize;
dumpsize += round_page(msgbufp->msg_size); dumpsize += round_page(msgbufp->msg_size);
dumpsize += round_page(vm_page_dump_size); dumpsize += round_page(vm_page_dump_size);
for (i = 0; i < vm_page_dump_size / sizeof(*vm_page_dump); i++) { for (i = 0; i < vm_page_dump_size / sizeof(*vm_page_dump); i++) {
bits = vm_page_dump[i]; bits = vm_page_dump[i];
while (bits) { while (bits) {
bit = ffs(bits) - 1; bit = ffs(bits) - 1;
pa = (((uint64_t)i * sizeof(*vm_page_dump) * NBBY) + pa = (((uint64_t)i * sizeof(*vm_page_dump) * NBBY) +
bit) * PAGE_SIZE; bit) * PAGE_SIZE;
/* Clear out undumpable pages now if needed */ /* Clear out undumpable pages now if needed */
if (is_dumpable(pa)) if (is_dumpable(pa))
dumpsize += PAGE_SIZE; dumpsize += PAGE_SIZE;
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 = ENOSPC;
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.ptesize = ptesize; mdhdr.ptesize = ptesize;
mdhdr.kernbase = KERNBASE; mdhdr.kernbase = KERNBASE;
mdhdr.arch = __ARM_ARCH; mdhdr.arch = __ARM_ARCH;
#if __ARM_ARCH >= 6 #if __ARM_ARCH >= 6
mdhdr.mmuformat = MINIDUMP_MMU_FORMAT_V6; mdhdr.mmuformat = MINIDUMP_MMU_FORMAT_V6;
#else #else
mdhdr.mmuformat = MINIDUMP_MMU_FORMAT_V4; mdhdr.mmuformat = MINIDUMP_MMU_FORMAT_V4;
#endif #endif
mkdumpheader(&kdh, KERNELDUMPMAGIC, KERNELDUMP_ARM_VERSION, dumpsize, mkdumpheader(&kdh, KERNELDUMPMAGIC, KERNELDUMP_ARM_VERSION, dumpsize,
kerneldumpcrypto_dumpkeysize(di->kdc), di->blocksize); kerneldumpcrypto_dumpkeysize(di->kdc), di->blocksize);
printf("Physical memory: %u MB\n", ptoa((uintmax_t)physmem) / 1048576); printf("Physical memory: %u MB\n", ptoa((uintmax_t)physmem) / 1048576);
printf("Dumping %llu MB:", (long long)dumpsize >> 20); printf("Dumping %llu MB:", (long long)dumpsize >> 20);
/* 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(dumpbuf, sizeof(dumpbuf)); bzero(dumpbuf, sizeof(dumpbuf));
bcopy(&mdhdr, dumpbuf, sizeof(mdhdr)); bcopy(&mdhdr, dumpbuf, sizeof(mdhdr));
error = blk_write(di, dumpbuf, 0, PAGE_SIZE); error = blk_write(di, dumpbuf, 0, PAGE_SIZE);
if (error) if (error)
goto fail; goto fail;
/* Dump msgbuf up front */ /* Dump msgbuf up front */
▲ Show 20 Lines • Show All 58 Lines • ▼ Show 20 Lines if (count) {
count = 0; count = 0;
prev_pa = 0; prev_pa = 0;
} }
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;
if (error == ECANCELED) if (error == ECANCELED)
printf("\nDump aborted\n"); printf("\nDump aborted\n");
else if (error == ENOSPC) else if (error == ENOSPC)
defUnsubmitted
Done
Inline Actions

I was thinking about

else if (error == E2BIG || error == ENOSPC)

here and in other architectures as dump_write() can still return ENOSPC which might happen when a number of pages being dumped has increased during dumping.

def: I was thinking about ``` else if (error == E2BIG || error == ENOSPC) ``` here and in other…
printf("\nDump failed. Partition too small.\n"); printf("\nDump failed. Partition too small.\n");
else else
printf("\n** DUMP FAILED (ERROR %d) **\n", error); printf("\n** 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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