db_textdump.c revision 183527
1174921Srwatson/*- 2174921Srwatson * Copyright (c) 2007 Robert N. M. Watson 3174921Srwatson * All rights reserved. 4174921Srwatson * 5174921Srwatson * Redistribution and use in source and binary forms, with or without 6174921Srwatson * modification, are permitted provided that the following conditions 7174921Srwatson * are met: 8174921Srwatson * 1. Redistributions of source code must retain the above copyright 9174921Srwatson * notice, this list of conditions and the following disclaimer. 10174921Srwatson * 2. Redistributions in binary form must reproduce the above copyright 11174921Srwatson * notice, this list of conditions and the following disclaimer in the 12174921Srwatson * documentation and/or other materials provided with the distribution. 13174921Srwatson * 14174921Srwatson * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15174921Srwatson * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16174921Srwatson * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17174921Srwatson * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18174921Srwatson * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19174921Srwatson * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20174921Srwatson * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21174921Srwatson * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22174921Srwatson * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23174921Srwatson * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24174921Srwatson * SUCH DAMAGE. 25174921Srwatson */ 26174921Srwatson 27174921Srwatson/*- 28175199Srwatson * Kernel text-dump support: write a series of text files to the dump 29175199Srwatson * partition for later recovery, including captured DDB output, kernel 30175199Srwatson * configuration, message buffer, and panic message. This allows for a more 31175199Srwatson * compact representation of critical debugging information than traditional 32175199Srwatson * binary dumps, as well as allowing dump information to be used without 33175199Srwatson * access to kernel symbols, source code, etc. 34174921Srwatson * 35174921Srwatson * Storage Layout 36174921Srwatson * -------------- 37174921Srwatson * 38174921Srwatson * Crash dumps are aligned to the end of the dump or swap partition in order 39174921Srwatson * to minimize the chances of swap duing fsck eating into the dump. However, 40174921Srwatson * unlike a memory dump, we don't know the size of the textdump a priori, so 41174921Srwatson * can't just write it out sequentially in order from a known starting point 42174921Srwatson * calculated with respect to the end of the partition. In order to address 43174921Srwatson * this, we actually write out the textdump in reverse block order, allowing 44174921Srwatson * us to directly align it to the end of the partition and then write out the 45174921Srwatson * dump header and trailer before and after it once done. savecore(8) must 46174921Srwatson * know to reverse the order of the blocks in order to produce a readable 47174921Srwatson * file. 48174921Srwatson * 49175199Srwatson * Data is written out in the ustar file format so that we can write data 50175199Srwatson * incrementally as a stream without reference to previous files. 51174921Srwatson * 52174921Srwatson * TODO 53174921Srwatson * ---- 54174921Srwatson * 55174921Srwatson * - Allow subsytems to register to submit files for inclusion in the text 56174921Srwatson * dump in a generic way. 57174921Srwatson */ 58174921Srwatson 59174921Srwatson#include <sys/cdefs.h> 60174921Srwatson__FBSDID("$FreeBSD: head/sys/ddb/db_textdump.c 183527 2008-10-01 22:08:53Z peter $"); 61174921Srwatson 62174921Srwatson#include "opt_config.h" 63174921Srwatson 64174921Srwatson#include <sys/param.h> 65174921Srwatson#include <sys/conf.h> 66174921Srwatson#include <sys/kernel.h> 67174921Srwatson#include <sys/kerneldump.h> 68174921Srwatson#include <sys/msgbuf.h> 69174921Srwatson#include <sys/sysctl.h> 70174921Srwatson#include <sys/systm.h> 71181803Sbz#include <sys/vimage.h> 72174921Srwatson 73174921Srwatson#include <ddb/ddb.h> 74174921Srwatson#include <ddb/db_lex.h> 75174921Srwatson 76174921Srwatsonstatic SYSCTL_NODE(_debug_ddb, OID_AUTO, textdump, CTLFLAG_RW, 0, 77174921Srwatson "DDB textdump options"); 78174921Srwatson 79174921Srwatson/* 80174921Srwatson * Don't touch the first SIZEOF_METADATA bytes on the dump device. This is 81174921Srwatson * to protect us from metadata and metadata from us. 82174921Srwatson */ 83174921Srwatson#define SIZEOF_METADATA (64*1024) 84174921Srwatson 85174921Srwatson/* 86174921Srwatson * Data is written out as a series of files in the ustar tar format. ustar 87174921Srwatson * is a simple streamed format consiting of a series of files prefixed with 88174921Srwatson * headers, and all padded to 512-byte block boundaries, which maps 89174921Srwatson * conveniently to our requirements. 90174921Srwatson */ 91174921Srwatsonstruct ustar_header { 92174921Srwatson char uh_filename[100]; 93174921Srwatson char uh_mode[8]; 94174921Srwatson char uh_tar_owner[8]; 95174921Srwatson char uh_tar_group[8]; 96174921Srwatson char uh_size[12]; 97174921Srwatson char uh_mtime[12]; 98174921Srwatson char uh_sum[8]; 99174921Srwatson char uh_type; 100174921Srwatson char uh_linkfile[100]; 101174921Srwatson char uh_ustar[6]; 102174921Srwatson char uh_version[2]; 103174921Srwatson char uh_owner[32]; 104174921Srwatson char uh_group[32]; 105174921Srwatson char uh_major[8]; 106174921Srwatson char uh_minor[8]; 107174921Srwatson char uh_filenameprefix[155]; 108174921Srwatson char uh_zeropad[12]; 109174921Srwatson} __packed; 110174921Srwatson 111174921Srwatson/* 112174921Srwatson * Various size assertions -- pretty much everything must be one block in 113174921Srwatson * size. 114174921Srwatson */ 115174921SrwatsonCTASSERT(sizeof(struct kerneldumpheader) == TEXTDUMP_BLOCKSIZE); 116174921SrwatsonCTASSERT(sizeof(struct ustar_header) == TEXTDUMP_BLOCKSIZE); 117174921Srwatson 118174921Srwatson/* 119174921Srwatson * Is a textdump scheduled? If so, the shutdown code will invoke our dumpsys 120174921Srwatson * routine instead of the machine-dependent kernel dump routine. 121174921Srwatson */ 122174921Srwatsonint textdump_pending; 123174921SrwatsonSYSCTL_INT(_debug_ddb_textdump, OID_AUTO, pending, CTLFLAG_RW, 124174921Srwatson &textdump_pending, 0, 125174921Srwatson "Perform textdump instead of regular kernel dump."); 126174921Srwatson 127174921Srwatson/* 128174921Srwatson * Various constants for tar headers and contents. 129174921Srwatson */ 130174921Srwatson#define TAR_USER "root" 131174921Srwatson#define TAR_GROUP "wheel" 132174921Srwatson#define TAR_UID "0" 133174921Srwatson#define TAR_GID "0" 134174921Srwatson#define TAR_MODE "0600" 135174921Srwatson#define TAR_USTAR "ustar" 136174921Srwatson 137174921Srwatson#define TAR_CONFIG_FILENAME "config.txt" /* Kernel configuration. */ 138174921Srwatson#define TAR_MSGBUF_FILENAME "msgbuf.txt" /* Kernel messsage buffer. */ 139174921Srwatson#define TAR_PANIC_FILENAME "panic.txt" /* Panic message. */ 140174921Srwatson#define TAR_VERSION_FILENAME "version.txt" /* Kernel version. */ 141174921Srwatson 142174921Srwatson/* 143174921Srwatson * Configure which files will be dumped. 144174921Srwatson */ 145174921Srwatson#ifdef INCLUDE_CONFIG_FILE 146174921Srwatsonstatic int textdump_do_config = 1; 147174921SrwatsonSYSCTL_INT(_debug_ddb_textdump, OID_AUTO, do_config, CTLFLAG_RW, 148174921Srwatson &textdump_do_config, 0, "Dump kernel configuration in textdump"); 149174921Srwatson#endif 150174921Srwatson 151174921Srwatsonstatic int textdump_do_ddb = 1; 152174921SrwatsonSYSCTL_INT(_debug_ddb_textdump, OID_AUTO, do_ddb, CTLFLAG_RW, 153174921Srwatson &textdump_do_ddb, 0, "Dump DDB captured output in textdump"); 154174921Srwatson 155174921Srwatsonstatic int textdump_do_msgbuf = 1; 156174921SrwatsonSYSCTL_INT(_debug_ddb_textdump, OID_AUTO, do_msgbuf, CTLFLAG_RW, 157174921Srwatson &textdump_do_msgbuf, 0, "Dump kernel message buffer in textdump"); 158174921Srwatson 159174921Srwatsonstatic int textdump_do_panic = 1; 160174921SrwatsonSYSCTL_INT(_debug_ddb_textdump, OID_AUTO, do_panic, CTLFLAG_RW, 161174921Srwatson &textdump_do_panic, 0, "Dump kernel panic message in textdump"); 162174921Srwatson 163174921Srwatsonstatic int textdump_do_version = 1; 164174921SrwatsonSYSCTL_INT(_debug_ddb_textdump, OID_AUTO, do_version, CTLFLAG_RW, 165174921Srwatson &textdump_do_version, 0, "Dump kernel version string in textdump"); 166174921Srwatson 167174921Srwatson/* 168174921Srwatson * State related to incremental writing of blocks to disk. 169174921Srwatson */ 170174921Srwatsonstatic off_t textdump_offset; /* Offset of next sequential write. */ 171174921Srwatsonstatic int textdump_error; /* Carried write error, if any. */ 172174921Srwatson 173174921Srwatson/* 174174921Srwatson * Statically allocate space to prepare block-sized headers and data. 175174921Srwatson */ 176174921Srwatsonchar textdump_block_buffer[TEXTDUMP_BLOCKSIZE]; 177174921Srwatsonstatic struct kerneldumpheader kdh; 178174921Srwatson 179174921Srwatson/* 180175199Srwatson * Calculate and fill in the checksum for a ustar header. 181174921Srwatson */ 182174921Srwatsonstatic void 183174921Srwatsonustar_checksum(struct ustar_header *uhp) 184174921Srwatson{ 185174921Srwatson u_int sum; 186174921Srwatson int i; 187174921Srwatson 188174921Srwatson for (i = 0; i < sizeof(uhp->uh_sum); i++) 189174921Srwatson uhp->uh_sum[i] = ' '; 190174921Srwatson sum = 0; 191174921Srwatson for (i = 0; i < sizeof(*uhp); i++) 192174921Srwatson sum += ((u_char *)uhp)[i]; 193174921Srwatson snprintf(uhp->uh_sum, sizeof(uhp->uh_sum), "%6o", sum); 194174921Srwatson} 195174921Srwatson 196174921Srwatson/* 197174921Srwatson * Each file in the tarball has a block-sized header with its name and other, 198174921Srwatson * largely hard-coded, properties. 199174921Srwatson */ 200174921Srwatsonvoid 201174921Srwatsontextdump_mkustar(char *block_buffer, const char *filename, u_int size) 202174921Srwatson{ 203174921Srwatson struct ustar_header *uhp; 204174921Srwatson 205174921Srwatson uhp = (struct ustar_header *)block_buffer; 206174921Srwatson bzero(uhp, sizeof(*uhp)); 207174921Srwatson strlcpy(uhp->uh_filename, filename, sizeof(uhp->uh_filename)); 208174921Srwatson strlcpy(uhp->uh_mode, TAR_MODE, sizeof(uhp->uh_mode)); 209174921Srwatson snprintf(uhp->uh_size, sizeof(uhp->uh_size), "%o", size); 210174921Srwatson strlcpy(uhp->uh_tar_owner, TAR_UID, sizeof(uhp->uh_tar_owner)); 211174921Srwatson strlcpy(uhp->uh_tar_group, TAR_GID, sizeof(uhp->uh_tar_group)); 212174921Srwatson strlcpy(uhp->uh_owner, TAR_USER, sizeof(uhp->uh_owner)); 213174921Srwatson strlcpy(uhp->uh_group, TAR_GROUP, sizeof(uhp->uh_group)); 214174921Srwatson snprintf(uhp->uh_mtime, sizeof(uhp->uh_mtime), "%lo", 215174921Srwatson (unsigned long)time_second); 216174921Srwatson uhp->uh_type = 0; 217174921Srwatson strlcpy(uhp->uh_ustar, TAR_USTAR, sizeof(uhp->uh_ustar)); 218174921Srwatson ustar_checksum(uhp); 219174921Srwatson} 220174921Srwatson 221174921Srwatson/* 222174921Srwatson * textdump_writeblock() writes TEXTDUMP_BLOCKSIZE-sized blocks of data to 223174921Srwatson * the space between di->mediaoffset and di->mediaoffset + di->mediasize. It 224174921Srwatson * accepts an offset relative to di->mediaoffset. If we're carrying any 225174921Srwatson * error from previous I/O, return that error and don't continue to try to 226174921Srwatson * write. Most writers ignore the error and forge ahead on the basis that 227174921Srwatson * there's not much you can do. 228174921Srwatson */ 229174921Srwatsonstatic int 230174921Srwatsontextdump_writeblock(struct dumperinfo *di, off_t offset, char *buffer) 231174921Srwatson{ 232174921Srwatson 233174921Srwatson if (textdump_error) 234174921Srwatson return (textdump_error); 235174921Srwatson if (offset + TEXTDUMP_BLOCKSIZE > di->mediasize) 236174921Srwatson return (EIO); 237174921Srwatson if (offset < SIZEOF_METADATA) 238174921Srwatson return (ENOSPC); 239175858Srwatson textdump_error = dump_write(di, buffer, 0, offset + di->mediaoffset, 240175858Srwatson TEXTDUMP_BLOCKSIZE); 241174921Srwatson return (textdump_error); 242174921Srwatson} 243174921Srwatson 244174921Srwatson/* 245174921Srwatson * Interfaces to save and restore the dump offset, so that printers can go 246174921Srwatson * back to rewrite a header if required, while avoiding their knowing about 247174921Srwatson * the global layout of the blocks. 248175199Srwatson * 249175199Srwatson * If we ever want to support writing textdumps to tape or other 250175199Srwatson * stream-oriented target, we'll need to remove this. 251174921Srwatson */ 252174921Srwatsonvoid 253174921Srwatsontextdump_saveoff(off_t *offsetp) 254174921Srwatson{ 255174921Srwatson 256174921Srwatson *offsetp = textdump_offset; 257174921Srwatson} 258174921Srwatson 259174921Srwatsonvoid 260174921Srwatsontextdump_restoreoff(off_t offset) 261174921Srwatson{ 262174921Srwatson 263174921Srwatson textdump_offset = offset; 264174921Srwatson} 265174921Srwatson 266174921Srwatson/* 267174921Srwatson * Interface to write the "next block" relative to the current offset; since 268174921Srwatson * we write backwards from the end of the partition, we subtract, but there's 269174921Srwatson * no reason for the caller to know this. 270174921Srwatson */ 271174921Srwatsonint 272174921Srwatsontextdump_writenextblock(struct dumperinfo *di, char *buffer) 273174921Srwatson{ 274174921Srwatson int error; 275174921Srwatson 276174921Srwatson error = textdump_writeblock(di, textdump_offset, buffer); 277174921Srwatson textdump_offset -= TEXTDUMP_BLOCKSIZE; 278174921Srwatson return (error); 279174921Srwatson} 280174921Srwatson 281174921Srwatson#ifdef INCLUDE_CONFIG_FILE 282174921Srwatsonextern char kernconfstring[]; 283174921Srwatson 284174921Srwatson/* 285174921Srwatson * Dump kernel configuration. 286174921Srwatson */ 287174921Srwatsonstatic void 288174921Srwatsontextdump_dump_config(struct dumperinfo *di) 289174921Srwatson{ 290174921Srwatson u_int count, fullblocks, len; 291174921Srwatson 292174921Srwatson len = strlen(kernconfstring); 293174921Srwatson textdump_mkustar(textdump_block_buffer, TAR_CONFIG_FILENAME, len); 294174921Srwatson (void)textdump_writenextblock(di, textdump_block_buffer); 295174921Srwatson 296174921Srwatson /* 297174921Srwatson * Write out all full blocks directly from the string, and handle any 298174921Srwatson * left-over bits by copying it to out to the local buffer and 299174921Srwatson * zero-padding it. 300174921Srwatson */ 301174921Srwatson fullblocks = len / TEXTDUMP_BLOCKSIZE; 302174921Srwatson for (count = 0; count < fullblocks; count++) 303174921Srwatson (void)textdump_writenextblock(di, kernconfstring + count * 304174921Srwatson TEXTDUMP_BLOCKSIZE); 305174921Srwatson if (len % TEXTDUMP_BLOCKSIZE != 0) { 306174921Srwatson bzero(textdump_block_buffer, TEXTDUMP_BLOCKSIZE); 307174921Srwatson bcopy(kernconfstring + count * TEXTDUMP_BLOCKSIZE, 308174921Srwatson textdump_block_buffer, len % TEXTDUMP_BLOCKSIZE); 309174921Srwatson (void)textdump_writenextblock(di, textdump_block_buffer); 310174921Srwatson } 311174921Srwatson} 312174921Srwatson#endif /* INCLUDE_CONFIG_FILE */ 313174921Srwatson 314174921Srwatson/* 315174921Srwatson * Dump kernel message buffer. 316174921Srwatson */ 317174921Srwatsonstatic void 318174921Srwatsontextdump_dump_msgbuf(struct dumperinfo *di) 319174921Srwatson{ 320174921Srwatson off_t end_offset, tarhdr_offset; 321174921Srwatson u_int i, len, offset, seq, total_len; 322174921Srwatson char buf[16]; 323174921Srwatson 324174921Srwatson /* 325174921Srwatson * Write out a dummy tar header to advance the offset; we'll rewrite 326174921Srwatson * it later once we know the true size. 327174921Srwatson */ 328174921Srwatson textdump_saveoff(&tarhdr_offset); 329174921Srwatson textdump_mkustar(textdump_block_buffer, TAR_MSGBUF_FILENAME, 0); 330174921Srwatson (void)textdump_writenextblock(di, textdump_block_buffer); 331174921Srwatson 332174921Srwatson /* 333174921Srwatson * Copy out the data in small chunks, but don't copy nuls that may be 334174921Srwatson * present if the message buffer has not yet completely filled at 335174921Srwatson * least once. 336174921Srwatson */ 337174921Srwatson total_len = 0; 338174921Srwatson offset = 0; 339174921Srwatson msgbuf_peekbytes(msgbufp, NULL, 0, &seq); 340174921Srwatson while ((len = msgbuf_peekbytes(msgbufp, buf, sizeof(buf), &seq)) > 0) { 341174921Srwatson for (i = 0; i < len; i++) { 342174921Srwatson if (buf[i] == '\0') 343174921Srwatson continue; 344174921Srwatson textdump_block_buffer[offset] = buf[i]; 345174921Srwatson offset++; 346174921Srwatson if (offset != sizeof(textdump_block_buffer)) 347174921Srwatson continue; 348174921Srwatson (void)textdump_writenextblock(di, 349174921Srwatson textdump_block_buffer); 350174921Srwatson total_len += offset; 351174921Srwatson offset = 0; 352174921Srwatson } 353174921Srwatson } 354174921Srwatson total_len += offset; /* Without the zero-padding. */ 355174921Srwatson if (offset != 0) { 356174921Srwatson bzero(textdump_block_buffer + offset, 357174921Srwatson sizeof(textdump_block_buffer) - offset); 358174921Srwatson (void)textdump_writenextblock(di, textdump_block_buffer); 359174921Srwatson } 360174921Srwatson 361174921Srwatson /* 362174921Srwatson * Rewrite tar header to reflect how much was actually written. 363174921Srwatson */ 364174921Srwatson textdump_saveoff(&end_offset); 365174921Srwatson textdump_restoreoff(tarhdr_offset); 366174921Srwatson textdump_mkustar(textdump_block_buffer, TAR_MSGBUF_FILENAME, 367174921Srwatson total_len); 368174921Srwatson (void)textdump_writenextblock(di, textdump_block_buffer); 369174921Srwatson textdump_restoreoff(end_offset); 370174921Srwatson} 371174921Srwatson 372174921Srwatsonstatic void 373174921Srwatsontextdump_dump_panic(struct dumperinfo *di) 374174921Srwatson{ 375174921Srwatson u_int len; 376174921Srwatson 377174921Srwatson /* 378174921Srwatson * Write out tar header -- we store up to one block of panic message. 379174921Srwatson */ 380174921Srwatson len = min(strlen(panicstr), TEXTDUMP_BLOCKSIZE); 381174921Srwatson textdump_mkustar(textdump_block_buffer, TAR_PANIC_FILENAME, len); 382174921Srwatson (void)textdump_writenextblock(di, textdump_block_buffer); 383174921Srwatson 384174921Srwatson /* 385174921Srwatson * Zero-pad the panic string and write out block. 386174921Srwatson */ 387174921Srwatson bzero(textdump_block_buffer, sizeof(textdump_block_buffer)); 388174921Srwatson bcopy(panicstr, textdump_block_buffer, len); 389174921Srwatson (void)textdump_writenextblock(di, textdump_block_buffer); 390174921Srwatson} 391174921Srwatson 392174921Srwatsonstatic void 393174921Srwatsontextdump_dump_version(struct dumperinfo *di) 394174921Srwatson{ 395174921Srwatson u_int len; 396174921Srwatson 397174921Srwatson /* 398174921Srwatson * Write out tar header -- at most one block of version information. 399174921Srwatson */ 400174921Srwatson len = min(strlen(version), TEXTDUMP_BLOCKSIZE); 401174921Srwatson textdump_mkustar(textdump_block_buffer, TAR_VERSION_FILENAME, len); 402174921Srwatson (void)textdump_writenextblock(di, textdump_block_buffer); 403174921Srwatson 404174921Srwatson /* 405174921Srwatson * Zero pad the version string and write out block. 406174921Srwatson */ 407174921Srwatson bzero(textdump_block_buffer, sizeof(textdump_block_buffer)); 408174921Srwatson bcopy(version, textdump_block_buffer, len); 409174921Srwatson (void)textdump_writenextblock(di, textdump_block_buffer); 410174921Srwatson} 411174921Srwatson 412174921Srwatson/* 413174921Srwatson * Commit text dump to disk. 414174921Srwatson */ 415174921Srwatsonvoid 416174921Srwatsontextdump_dumpsys(struct dumperinfo *di) 417174921Srwatson{ 418174921Srwatson off_t dumplen, trailer_offset; 419174921Srwatson 420174921Srwatson if (di->blocksize != TEXTDUMP_BLOCKSIZE) { 421174921Srwatson printf("Dump partition block size (%ju) not textdump " 422174921Srwatson "block size (%ju)", (uintmax_t)di->blocksize, 423174921Srwatson (uintmax_t)TEXTDUMP_BLOCKSIZE); 424174921Srwatson return; 425174921Srwatson } 426174921Srwatson 427174921Srwatson /* 428174921Srwatson * We don't know a priori how large the dump will be, but we do know 429174921Srwatson * that we need to reserve space for metadata and that we need two 430174921Srwatson * dump headers. Also leave room for one ustar header and one block 431174921Srwatson * of data. 432174921Srwatson */ 433174921Srwatson if (di->mediasize < SIZEOF_METADATA + 2 * sizeof(kdh)) { 434174921Srwatson printf("Insufficient space on dump partition.\n"); 435174921Srwatson return; 436174921Srwatson } 437174921Srwatson textdump_error = 0; 438174921Srwatson 439174921Srwatson /* 440174921Srwatson * Position the start of the dump so that we'll write the kernel dump 441174921Srwatson * trailer immediately before the end of the partition, and then work 442174921Srwatson * our way back. We will rewrite this header later to reflect the 443174921Srwatson * true size if things go well. 444174921Srwatson */ 445174921Srwatson textdump_offset = di->mediasize - sizeof(kdh); 446174921Srwatson textdump_saveoff(&trailer_offset); 447183527Speter mkdumpheader(&kdh, TEXTDUMPMAGIC, KERNELDUMP_TEXT_VERSION, 0, TEXTDUMP_BLOCKSIZE); 448174921Srwatson (void)textdump_writenextblock(di, (char *)&kdh); 449174921Srwatson 450174921Srwatson /* 451174921Srwatson * Write a series of files in ustar format. 452174921Srwatson */ 453174921Srwatson if (textdump_do_ddb) 454174921Srwatson db_capture_dump(di); 455174921Srwatson#ifdef INCLUDE_CONFIG_FILE 456174921Srwatson if (textdump_do_config) 457174921Srwatson textdump_dump_config(di); 458174921Srwatson#endif 459174921Srwatson if (textdump_do_msgbuf) 460174921Srwatson textdump_dump_msgbuf(di); 461174921Srwatson if (textdump_do_panic && panicstr != NULL) 462174921Srwatson textdump_dump_panic(di); 463174921Srwatson if (textdump_do_version) 464174921Srwatson textdump_dump_version(di); 465174921Srwatson 466174921Srwatson /* 467174921Srwatson * Now that we know the true size, we can write out the header, then 468174921Srwatson * seek back to the end and rewrite the trailer with the correct 469174921Srwatson * size. 470174921Srwatson */ 471174921Srwatson dumplen = trailer_offset - (textdump_offset + TEXTDUMP_BLOCKSIZE); 472183527Speter mkdumpheader(&kdh, TEXTDUMPMAGIC, KERNELDUMP_TEXT_VERSION, dumplen, 473174921Srwatson TEXTDUMP_BLOCKSIZE); 474174921Srwatson (void)textdump_writenextblock(di, (char *)&kdh); 475174921Srwatson textdump_restoreoff(trailer_offset); 476174921Srwatson (void)textdump_writenextblock(di, (char *)&kdh); 477174921Srwatson 478174921Srwatson /* 479174921Srwatson * Terminate the dump, report any errors, and clear the pending flag. 480174921Srwatson */ 481174921Srwatson if (textdump_error == 0) 482175858Srwatson (void)dump_write(di, NULL, 0, 0, 0); 483174921Srwatson if (textdump_error == ENOSPC) 484174921Srwatson printf("Insufficient space on dump partition\n"); 485174921Srwatson else if (textdump_error != 0) 486174921Srwatson printf("Error %d writing dump\n", textdump_error); 487174921Srwatson else 488174921Srwatson printf("Textdump complete.\n"); 489174921Srwatson textdump_pending = 0; 490174921Srwatson} 491174921Srwatson 492174921Srwatson/*- 493174921Srwatson * DDB(4) command to manage textdumps: 494174921Srwatson * 495174921Srwatson * textdump set - request a textdump 496174921Srwatson * textdump status - print DDB output textdump status 497174921Srwatson * textdump unset - clear textdump request 498174921Srwatson */ 499174921Srwatsonstatic void 500174921Srwatsondb_textdump_usage(void) 501174921Srwatson{ 502174921Srwatson 503174921Srwatson db_printf("textdump [unset|set|status]\n"); 504174921Srwatson} 505174921Srwatson 506174921Srwatsonvoid 507174921Srwatsondb_textdump_cmd(db_expr_t addr, boolean_t have_addr, db_expr_t count, 508174921Srwatson char *modif) 509174921Srwatson{ 510174921Srwatson int t; 511174921Srwatson 512174921Srwatson t = db_read_token(); 513174921Srwatson if (t != tIDENT) { 514174921Srwatson db_textdump_usage(); 515174921Srwatson return; 516174921Srwatson } 517174921Srwatson if (db_read_token() != tEOL) { 518174921Srwatson db_textdump_usage(); 519174921Srwatson return; 520174921Srwatson } 521174921Srwatson if (strcmp(db_tok_string, "set") == 0) { 522174921Srwatson textdump_pending = 1; 523174921Srwatson db_printf("textdump set\n"); 524174921Srwatson } else if (strcmp(db_tok_string, "status") == 0) { 525174921Srwatson if (textdump_pending) 526174921Srwatson db_printf("textdump is set\n"); 527174921Srwatson else 528174921Srwatson db_printf("textdump is not set\n"); 529174921Srwatson } else if (strcmp(db_tok_string, "unset") == 0) { 530174921Srwatson textdump_pending = 0; 531174921Srwatson db_printf("textdump unset\n"); 532174921Srwatson } else 533174921Srwatson db_textdump_usage(); 534174921Srwatson} 535