Kernel dump for arm, ripped from the ia64/amd64 version.

1 files changed, 353 insertions, 15 deletions

diff --git a/sys/arm/arm/dump_machdep.c b/sys/arm/arm/dump_machdep.c
index 38841e4..1ad4335 100644
--- a/sys/arm/arm/dump_machdep.c
+++ b/sys/arm/arm/dump_machdep.c
@@ -1,29 +1,27 @@
 /*-
- * Copyright (c) 2004 Olivier Houchard
+ * 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.
- * 3. The names of the authors may not be used to endorse or promote
- *    products derived from this software without specific prior written
- *    permission.
  *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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.
+ * 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>
@@ -34,12 +32,352 @@ __FBSDID("$FreeBSD$");
 #include <sys/conf.h>
 #include <sys/cons.h>
 #include <sys/kernel.h>
+#include <sys/proc.h>
 #include <sys/kerneldump.h>
 #include <vm/vm.h>
 #include <vm/pmap.h>
+#include <machine/elf.h>
 #include <machine/md_var.h>
+#include <machine/pcb.h>
+#include <machine/armreg.h>
+
+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)
+
+#define	MD_ALIGN(x)	(((off_t)(x) + PAGE_MASK) & ~PAGE_MASK)
+#define	DEV_ALIGN(x)	(((off_t)(x) + (DEV_BSIZE-1)) & ~(DEV_BSIZE-1))
+extern struct pcb dumppcb;
+
+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;
+
+/* XXX: I suppose 20 should be enough. */
+static struct md_pa dump_map[20];
+
+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);
+}
+
+/* XXX should be MI */
+static void
+mkdumpheader(struct kerneldumpheader *kdh, uint32_t archver, uint64_t dumplen,
+    uint32_t blksz)
+{
+
+	bzero(kdh, sizeof(*kdh));
+	strncpy(kdh->magic, KERNELDUMPMAGIC, sizeof(kdh->magic));
+	strncpy(kdh->architecture, MACHINE_ARCH, sizeof(kdh->architecture));
+	kdh->version = htod32(KERNELDUMPVERSION);
+	kdh->architectureversion = htod32(archver);
+	kdh->dumplength = htod64(dumplen);
+	kdh->dumptime = htod64(time_second);
+	kdh->blocksize = htod32(blksz);
+	strncpy(kdh->hostname, hostname, sizeof(kdh->hostname));
+	strncpy(kdh->versionstring, version, sizeof(kdh->versionstring));
+	if (panicstr != NULL)
+		strncpy(kdh->panicstring, panicstr, sizeof(kdh->panicstring));
+	kdh->parity = kerneldump_parity(kdh);
+}
+
+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 = di->dumper(di->priv, 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 = di->dumper(di->priv, buffer, 0, dumplo, DEV_BSIZE);
+	dumplo += DEV_BSIZE;
+	fragsz = 0;
+	return (error);
+}
+
+extern vm_offset_t kernel_l1kva;
+extern char *pouet2;
+
+static int
+cb_dumpdata(struct md_pa *mdp, int seqnr, void *arg)
+{
+	struct dumperinfo *di = (struct dumperinfo*)arg;
+	vm_paddr_t pa;
+	vm_offset_t va;
+	uint32_t pgs;
+	size_t counter, sz, chunk;
+	int c, error, twiddle;
+
+	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;
+
+	printf("  chunk %d: %dMB (%d pages)", seqnr, pgs * PAGE_SIZE / (
+	    1024*1024), pgs);
+
+	/* Make sure we write coherent datas. */
+	cpu_idcache_wbinv_all();
+#ifdef __XSCALE__
+	xscale_cache_clean_minidata();
+#endif
+	while (pgs) {
+		chunk = pgs;
+		if (chunk > MAXDUMPPGS)
+			chunk = MAXDUMPPGS;
+		sz = chunk << PAGE_SHIFT;
+		counter += sz;
+		if (counter >> 24) {
+			printf(" %d", pgs * PAGE_SIZE);
+			counter &= (1<<24) - 1;
+		}
+		if (pa == (pa & L1_ADDR_BITS)) {
+			pmap_kenter_section(0, pa & L1_ADDR_BITS, 0);
+			cpu_tlb_flushID_SE(0);
+			cpu_cpwait();
+		}
+		error = di->dumper(di->priv, 
+		    (void *)(pa - (pa & L1_ADDR_BITS)),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)
+{
+	uint32_t *sz = (uint32_t*)arg;
+
+	*sz += (uint32_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;
+	uint32_t dumpsize;
+	off_t hdrgap;
+	size_t hdrsz;
+	int error;
+	
+	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_ARM;
+	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, KERNELDUMP_ARM_VERSION, dumpsize, di->blocksize);
+
+	printf("Dumping %llu MB (%d chunks)\n", (long long)dumpsize >> 20,
+	    ehdr.e_phnum);
+
+	/* Dump leader */
+	error = di->dumper(di->priv, &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 = di->dumper(di->priv, &kdh, 0, dumplo, sizeof(kdh));
+	if (error)
+		goto fail;
+
+	/* Signal completion, signoff and exit stage left. */
+	di->dumper(di->priv, 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);
 }