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-rw-r--r--sys/x86/x86/dump_machdep.c373
1 files changed, 373 insertions, 0 deletions
diff --git a/sys/x86/x86/dump_machdep.c b/sys/x86/x86/dump_machdep.c
new file mode 100644
index 0000000..d0a7612
--- /dev/null
+++ b/sys/x86/x86/dump_machdep.c
@@ -0,0 +1,373 @@
+/*-
+ * Copyright (c) 2002 Marcel Moolenaar
+ * All rights reserved.
+ *
+ * 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 ``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 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.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/conf.h>
+#include <sys/cons.h>
+#include <sys/sysctl.h>
+#include <sys/kernel.h>
+#include <sys/kerneldump.h>
+#include <vm/vm.h>
+#include <vm/pmap.h>
+#include <machine/elf.h>
+#include <machine/md_var.h>
+
+#ifdef __amd64__
+#define KERNELDUMP_VERSION KERNELDUMP_AMD64_VERSION
+#define EM_VALUE EM_X86_64
+#else
+#define KERNELDUMP_VERSION KERNELDUMP_I386_VERSION
+#define EM_VALUE EM_386
+#endif
+
+CTASSERT(sizeof(struct kerneldumpheader) == 512);
+
+int do_minidump = 1;
+TUNABLE_INT("debug.minidump", &do_minidump);
+SYSCTL_INT(_debug, OID_AUTO, minidump, CTLFLAG_RW, &do_minidump, 0,
+ "Enable mini crash dumps");
+
+/*
+ * 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)
+
+#define MD_ALIGN(x) (((off_t)(x) + PAGE_MASK) & ~PAGE_MASK)
+#define DEV_ALIGN(x) (((off_t)(x) + (DEV_BSIZE-1)) & ~(DEV_BSIZE-1))
+
+struct md_pa {
+ vm_paddr_t md_start;
+ vm_paddr_t md_size;
+};
+
+typedef int callback_t(struct md_pa *, int, void *);
+
+static struct kerneldumpheader kdh;
+static off_t dumplo, fileofs;
+
+/* Handle buffered writes. */
+static char buffer[DEV_BSIZE];
+static size_t fragsz;
+
+/* 20 phys_avail entry pairs correspond to 10 md_pa's */
+static struct md_pa dump_map[10];
+
+static void
+md_pa_init(void)
+{
+ int n, idx;
+
+ bzero(dump_map, sizeof(dump_map));
+ for (n = 0; n < sizeof(dump_map) / sizeof(dump_map[0]); n++) {
+ idx = n * 2;
+ if (dump_avail[idx] == 0 && dump_avail[idx + 1] == 0)
+ break;
+ dump_map[n].md_start = dump_avail[idx];
+ dump_map[n].md_size = dump_avail[idx + 1] - dump_avail[idx];
+ }
+}
+
+static struct md_pa *
+md_pa_first(void)
+{
+
+ return (&dump_map[0]);
+}
+
+static struct md_pa *
+md_pa_next(struct md_pa *mdp)
+{
+
+ mdp++;
+ if (mdp->md_size == 0)
+ mdp = NULL;
+ return (mdp);
+}
+
+static int
+buf_write(struct dumperinfo *di, char *ptr, size_t sz)
+{
+ size_t len;
+ int error;
+
+ while (sz) {
+ len = DEV_BSIZE - fragsz;
+ if (len > sz)
+ len = sz;
+ bcopy(ptr, buffer + fragsz, len);
+ fragsz += len;
+ ptr += len;
+ sz -= len;
+ if (fragsz == DEV_BSIZE) {
+ error = dump_write(di, buffer, 0, dumplo,
+ DEV_BSIZE);
+ if (error)
+ return error;
+ dumplo += DEV_BSIZE;
+ fragsz = 0;
+ }
+ }
+
+ return (0);
+}
+
+static int
+buf_flush(struct dumperinfo *di)
+{
+ int error;
+
+ if (fragsz == 0)
+ return (0);
+
+ error = dump_write(di, buffer, 0, dumplo, DEV_BSIZE);
+ dumplo += DEV_BSIZE;
+ fragsz = 0;
+ return (error);
+}
+
+#define PG2MB(pgs) ((pgs + (1 << 8) - 1) >> 8)
+
+static int
+cb_dumpdata(struct md_pa *mdp, int seqnr, void *arg)
+{
+ struct dumperinfo *di = (struct dumperinfo*)arg;
+ vm_paddr_t a, pa;
+ void *va;
+ uint64_t pgs;
+ size_t counter, sz, chunk;
+ int i, c, error, twiddle;
+ u_int maxdumppgs;
+
+ error = 0; /* catch case in which chunk size is 0 */
+ counter = 0; /* Update twiddle every 16MB */
+ twiddle = 0;
+ va = 0;
+ pgs = mdp->md_size / PAGE_SIZE;
+ pa = mdp->md_start;
+ maxdumppgs = min(di->maxiosize / PAGE_SIZE, MAXDUMPPGS);
+ if (maxdumppgs == 0) /* seatbelt */
+ maxdumppgs = 1;
+
+ printf(" chunk %d: %juMB (%ju pages)", seqnr, (uintmax_t)PG2MB(pgs),
+ (uintmax_t)pgs);
+
+ while (pgs) {
+ chunk = pgs;
+ if (chunk > maxdumppgs)
+ chunk = maxdumppgs;
+ sz = chunk << PAGE_SHIFT;
+ counter += sz;
+ if (counter >> 24) {
+ printf(" %ju", (uintmax_t)PG2MB(pgs));
+ counter &= (1<<24) - 1;
+ }
+ for (i = 0; i < chunk; i++) {
+ a = pa + i * PAGE_SIZE;
+ va = pmap_kenter_temporary(trunc_page(a), i);
+ }
+ error = dump_write(di, va, 0, dumplo, sz);
+ if (error)
+ break;
+ dumplo += sz;
+ pgs -= chunk;
+ pa += sz;
+
+ /* Check for user abort. */
+ c = cncheckc();
+ if (c == 0x03)
+ return (ECANCELED);
+ if (c != -1)
+ printf(" (CTRL-C to abort) ");
+ }
+ printf(" ... %s\n", (error) ? "fail" : "ok");
+ return (error);
+}
+
+static int
+cb_dumphdr(struct md_pa *mdp, int seqnr, void *arg)
+{
+ struct dumperinfo *di = (struct dumperinfo*)arg;
+ Elf_Phdr phdr;
+ uint64_t size;
+ int error;
+
+ size = mdp->md_size;
+ bzero(&phdr, sizeof(phdr));
+ phdr.p_type = PT_LOAD;
+ phdr.p_flags = PF_R; /* XXX */
+ phdr.p_offset = fileofs;
+ phdr.p_vaddr = mdp->md_start;
+ phdr.p_paddr = mdp->md_start;
+ phdr.p_filesz = size;
+ phdr.p_memsz = size;
+ phdr.p_align = PAGE_SIZE;
+
+ error = buf_write(di, (char*)&phdr, sizeof(phdr));
+ fileofs += phdr.p_filesz;
+ return (error);
+}
+
+static int
+cb_size(struct md_pa *mdp, int seqnr, void *arg)
+{
+ uint64_t *sz = (uint64_t*)arg;
+
+ *sz += (uint64_t)mdp->md_size;
+ return (0);
+}
+
+static int
+foreach_chunk(callback_t cb, void *arg)
+{
+ struct md_pa *mdp;
+ int error, seqnr;
+
+ seqnr = 0;
+ mdp = md_pa_first();
+ while (mdp != NULL) {
+ error = (*cb)(mdp, seqnr++, arg);
+ if (error)
+ return (-error);
+ mdp = md_pa_next(mdp);
+ }
+ return (seqnr);
+}
+
+void
+dumpsys(struct dumperinfo *di)
+{
+ Elf_Ehdr ehdr;
+ uint64_t dumpsize;
+ off_t hdrgap;
+ size_t hdrsz;
+ int error;
+
+ if (do_minidump) {
+ minidumpsys(di);
+ return;
+ }
+ bzero(&ehdr, sizeof(ehdr));
+ ehdr.e_ident[EI_MAG0] = ELFMAG0;
+ ehdr.e_ident[EI_MAG1] = ELFMAG1;
+ ehdr.e_ident[EI_MAG2] = ELFMAG2;
+ ehdr.e_ident[EI_MAG3] = ELFMAG3;
+ ehdr.e_ident[EI_CLASS] = ELF_CLASS;
+#if BYTE_ORDER == LITTLE_ENDIAN
+ ehdr.e_ident[EI_DATA] = ELFDATA2LSB;
+#else
+ ehdr.e_ident[EI_DATA] = ELFDATA2MSB;
+#endif
+ ehdr.e_ident[EI_VERSION] = EV_CURRENT;
+ ehdr.e_ident[EI_OSABI] = ELFOSABI_STANDALONE; /* XXX big picture? */
+ ehdr.e_type = ET_CORE;
+ ehdr.e_machine = EM_VALUE;
+ ehdr.e_phoff = sizeof(ehdr);
+ ehdr.e_flags = 0;
+ ehdr.e_ehsize = sizeof(ehdr);
+ ehdr.e_phentsize = sizeof(Elf_Phdr);
+ ehdr.e_shentsize = sizeof(Elf_Shdr);
+
+ md_pa_init();
+
+ /* Calculate dump size. */
+ dumpsize = 0L;
+ ehdr.e_phnum = foreach_chunk(cb_size, &dumpsize);
+ hdrsz = ehdr.e_phoff + ehdr.e_phnum * ehdr.e_phentsize;
+ fileofs = MD_ALIGN(hdrsz);
+ dumpsize += fileofs;
+ hdrgap = fileofs - DEV_ALIGN(hdrsz);
+
+ /* Determine dump offset on device. */
+ if (di->mediasize < SIZEOF_METADATA + dumpsize + sizeof(kdh) * 2) {
+ error = ENOSPC;
+ goto fail;
+ }
+ dumplo = di->mediaoffset + di->mediasize - dumpsize;
+ dumplo -= sizeof(kdh) * 2;
+
+ mkdumpheader(&kdh, KERNELDUMPMAGIC, KERNELDUMP_VERSION, dumpsize,
+ di->blocksize);
+
+ printf("Dumping %llu MB (%d chunks)\n", (long long)dumpsize >> 20,
+ ehdr.e_phnum);
+
+ /* Dump leader */
+ error = dump_write(di, &kdh, 0, dumplo, sizeof(kdh));
+ if (error)
+ goto fail;
+ dumplo += sizeof(kdh);
+
+ /* Dump ELF header */
+ error = buf_write(di, (char*)&ehdr, sizeof(ehdr));
+ if (error)
+ goto fail;
+
+ /* Dump program headers */
+ error = foreach_chunk(cb_dumphdr, di);
+ if (error < 0)
+ goto fail;
+ buf_flush(di);
+
+ /*
+ * All headers are written using blocked I/O, so we know the
+ * current offset is (still) block aligned. Skip the alignement
+ * in the file to have the segment contents aligned at page
+ * boundary. We cannot use MD_ALIGN on dumplo, because we don't
+ * care and may very well be unaligned within the dump device.
+ */
+ dumplo += hdrgap;
+
+ /* Dump memory chunks (updates dumplo) */
+ error = foreach_chunk(cb_dumpdata, di);
+ if (error < 0)
+ goto fail;
+
+ /* Dump trailer */
+ error = dump_write(di, &kdh, 0, dumplo, sizeof(kdh));
+ if (error)
+ goto fail;
+
+ /* Signal completion, signoff and exit stage left. */
+ dump_write(di, NULL, 0, 0, 0);
+ printf("\nDump complete\n");
+ return;
+
+ fail:
+ if (error < 0)
+ error = -error;
+
+ if (error == ECANCELED)
+ printf("\nDump aborted\n");
+ else if (error == ENOSPC)
+ printf("\nDump failed. Partition too small.\n");
+ else
+ printf("\n** DUMP FAILED (ERROR %d) **\n", error);
+}
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