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IABSD.fr/src/sys/ddb/db_command.c
mpi
- sys/ddb/db_command.c
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/* $OpenBSD: db_command.c,v 1.88 2019/11/07 13:16:25 mpi Exp $ */ /* $NetBSD: db_command.c,v 1.20 1996/03/30 22:30:05 christos Exp $ */ /* * Mach Operating System * Copyright (c) 1993,1992,1991,1990 Carnegie Mellon University * All Rights Reserved. * * Permission to use, copy, modify and distribute this software and its * documentation is hereby granted, provided that both the copyright * notice and this permission notice appear in all copies of the * software, derivative works or modified versions, and any portions * thereof, and that both notices appear in supporting documentation. * * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. * * Carnegie Mellon requests users of this software to return to * * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU * School of Computer Science * Carnegie Mellon University * Pittsburgh PA 15213-3890 * * any improvements or extensions that they make and grant Carnegie Mellon * the rights to redistribute these changes. */ /* * Command dispatcher. */ #include <sys/param.h> #include <sys/systm.h> #include <sys/proc.h> #include <sys/reboot.h> #include <sys/extent.h> #include <sys/pool.h> #include <sys/msgbuf.h> #include <sys/malloc.h> #include <sys/mount.h> #include <uvm/uvm_extern.h> #include <machine/db_machdep.h> /* type definitions */ #include <ddb/db_access.h> #include <ddb/db_lex.h> #include <ddb/db_output.h> #include <ddb/db_command.h> #include <ddb/db_break.h> #include <ddb/db_watch.h> #include <ddb/db_run.h> #include <ddb/db_sym.h> #include <ddb/db_var.h> #include <ddb/db_variables.h> #include <ddb/db_interface.h> #include <ddb/db_extern.h> #include <uvm/uvm_ddb.h> /* * Exported global variables */ int db_cmd_loop_done; label_t *db_recover; /* * if 'ed' style: 'dot' is set at start of last item printed, * and '+' points to next line. * Otherwise: 'dot' points to next item, '..' points to last. */ int db_ed_style = 1; vaddr_t db_dot; /* current location */ vaddr_t db_last_addr; /* last explicit address typed */ vaddr_t db_prev; /* last address examined or written */ vaddr_t db_next; /* next address to be examined or written */ int db_cmd_search(char *, struct db_command *, struct db_command **); void db_cmd_list(struct db_command *); void db_ctf_pprint_cmd(db_expr_t, int, db_expr_t,char *); void db_map_print_cmd(db_expr_t, int, db_expr_t, char *); void db_buf_print_cmd(db_expr_t, int, db_expr_t, char *); void db_malloc_print_cmd(db_expr_t, int, db_expr_t, char *); void db_mbuf_print_cmd(db_expr_t, int, db_expr_t, char *); void db_mount_print_cmd(db_expr_t, int, db_expr_t, char *); void db_show_all_mounts(db_expr_t, int, db_expr_t, char *); void db_show_all_vnodes(db_expr_t, int, db_expr_t, char *); void db_show_all_bufs(db_expr_t, int, db_expr_t, char *); void db_object_print_cmd(db_expr_t, int, db_expr_t, char *); void db_page_print_cmd(db_expr_t, int, db_expr_t, char *); void db_extent_print_cmd(db_expr_t, int, db_expr_t, char *); void db_pool_print_cmd(db_expr_t, int, db_expr_t, char *); void db_proc_print_cmd(db_expr_t, int, db_expr_t, char *); void db_uvmexp_print_cmd(db_expr_t, int, db_expr_t, char *); void db_vnode_print_cmd(db_expr_t, int, db_expr_t, char *); void db_nfsreq_print_cmd(db_expr_t, int, db_expr_t, char *); void db_nfsnode_print_cmd(db_expr_t, int, db_expr_t, char *); void db_help_cmd(db_expr_t, int, db_expr_t, char *); void db_fncall(db_expr_t, int, db_expr_t, char *); void db_boot_sync_cmd(db_expr_t, int, db_expr_t, char *); void db_boot_crash_cmd(db_expr_t, int, db_expr_t, char *); void db_boot_dump_cmd(db_expr_t, int, db_expr_t, char *); void db_boot_halt_cmd(db_expr_t, int, db_expr_t, char *); void db_boot_reboot_cmd(db_expr_t, int, db_expr_t, char *); void db_boot_poweroff_cmd(db_expr_t, int, db_expr_t, char *); void db_stack_trace_cmd(db_expr_t, int, db_expr_t, char *); void db_dmesg_cmd(db_expr_t, int, db_expr_t, char *); void db_show_panic_cmd(db_expr_t, int, db_expr_t, char *); void db_bcstats_print_cmd(db_expr_t, int, db_expr_t, char *); void db_struct_offset_cmd(db_expr_t, int, db_expr_t, char *); void db_ctf_show_struct(db_expr_t, int, db_expr_t, char *); void db_show_regs(db_expr_t, int, db_expr_t, char *); void db_write_cmd(db_expr_t, int, db_expr_t, char *); void db_witness_display(db_expr_t, int, db_expr_t, char *); void db_witness_list(db_expr_t, int, db_expr_t, char *); void db_witness_list_all(db_expr_t, int, db_expr_t, char *); /* * Utility routine - discard tokens through end-of-line. */ void db_skip_to_eol(void) { int t; do { t = db_read_token(); } while (t != tEOL); } /* * Results of command search. */ #define CMD_UNIQUE 0 #define CMD_FOUND 1 #define CMD_NONE 2 #define CMD_AMBIGUOUS 3 /* * Search for command prefix. */ int db_cmd_search(char *name, struct db_command *table, struct db_command **cmdp) { struct db_command *cmd; int result = CMD_NONE; for (cmd = table; cmd->name != 0; cmd++) { char *lp; char *rp; int c; lp = name; rp = cmd->name; while ((c = *lp) == *rp) { if (c == 0) { /* complete match */ *cmdp = cmd; return (CMD_UNIQUE); } lp++; rp++; } if (c == 0) { /* end of name, not end of command - partial match */ if (result == CMD_FOUND) { result = CMD_AMBIGUOUS; /* but keep looking for a full match - this lets us match single letters */ } else { *cmdp = cmd; result = CMD_FOUND; } } } return (result); } void db_cmd_list(struct db_command *table) { struct db_command *cmd; for (cmd = table; cmd->name != 0; cmd++) { db_printf("%-12s", cmd->name); db_end_line(12); } } void db_command(struct db_command **last_cmdp, struct db_command *cmd_table) { struct db_command *cmd; char modif[TOK_STRING_SIZE]; db_expr_t addr, count; int t, result, have_addr = 0; t = db_read_token(); if (t == tEOL) { /* empty line repeats last command, at 'next' */ cmd = *last_cmdp; addr = (db_expr_t)db_next; have_addr = 0; count = 1; modif[0] = '\0'; } else if (t == tEXCL) { db_fncall(0, 0, 0, NULL); return; } else if (t != tIDENT) { db_printf("?\n"); db_flush_lex(); return; } else { /* * Search for command */ while (cmd_table) { result = db_cmd_search(db_tok_string, cmd_table, &cmd); switch (result) { case CMD_NONE: db_printf("No such command\n"); db_flush_lex(); return; case CMD_AMBIGUOUS: db_printf("Ambiguous\n"); db_flush_lex(); return; default: break; } if ((cmd_table = cmd->more) != 0) { t = db_read_token(); if (t != tIDENT) { db_cmd_list(cmd_table); db_flush_lex(); return; } } } if ((cmd->flag & CS_OWN) == 0) { /* * Standard syntax: * command [/modifier] [addr] [,count] */ t = db_read_token(); if (t == tSLASH) { t = db_read_token(); if (t != tIDENT) { db_printf("Bad modifier\n"); db_flush_lex(); return; } db_strlcpy(modif, db_tok_string, sizeof(modif)); } else { db_unread_token(t); modif[0] = '\0'; } if (db_expression(&addr)) { db_dot = (vaddr_t) addr; db_last_addr = db_dot; have_addr = 1; } else { addr = (db_expr_t) db_dot; have_addr = 0; } t = db_read_token(); if (t == tCOMMA) { if (!db_expression(&count)) { db_printf("Count missing\n"); db_flush_lex(); return; } } else { db_unread_token(t); count = -1; } if ((cmd->flag & CS_MORE) == 0) { db_skip_to_eol(); } } } *last_cmdp = cmd; if (cmd != 0) { /* * Execute the command. */ (*cmd->fcn)(addr, have_addr, count, modif); if (cmd->flag & CS_SET_DOT) { /* * If command changes dot, set dot to * previous address displayed (if 'ed' style). */ if (db_ed_style) { db_dot = db_prev; } else { db_dot = db_next; } } else { /* * If command does not change dot, * set 'next' location to be the same. */ db_next = db_dot; } } } /*ARGSUSED*/ void db_buf_print_cmd(db_expr_t addr, int have_addr, db_expr_t count, char *modif) { int full = 0; if (modif[0] == 'f') full = 1; vfs_buf_print((void *) addr, full, db_printf); } /*ARGSUSED*/ void db_map_print_cmd(db_expr_t addr, int have_addr, db_expr_t count, char *modif) { int full = 0; if (modif[0] == 'f') full = 1; uvm_map_printit((struct vm_map *) addr, full, db_printf); } /*ARGSUSED*/ void db_malloc_print_cmd(db_expr_t addr, int have_addr, db_expr_t count, char *modif) { malloc_printit(db_printf); } /*ARGSUSED*/ void db_mbuf_print_cmd(db_expr_t addr, int have_addr, db_expr_t count, char *modif) { m_print((void *)addr, db_printf); } /*ARGSUSED*/ void db_socket_print_cmd(db_expr_t addr, int have_addr, db_expr_t count, char *modif) { so_print((void *)addr, db_printf); } /*ARGSUSED*/ void db_mount_print_cmd(db_expr_t addr, int have_addr, db_expr_t count, char *modif) { int full = 0; if (modif[0] == 'f') full = 1; vfs_mount_print((struct mount *) addr, full, db_printf); } void db_show_all_mounts(db_expr_t addr, int have_addr, db_expr_t count, char *modif) { int full = 0; struct mount *mp; if (modif[0] == 'f') full = 1; TAILQ_FOREACH(mp, &mountlist, mnt_list) { db_printf("mountpoint %p\n", mp); vfs_mount_print(mp, full, db_printf); } } extern struct pool vnode_pool; void db_show_all_vnodes(db_expr_t addr, int have_addr, db_expr_t count, char *modif) { int full = 0; if (modif[0] == 'f') full = 1; pool_walk(&vnode_pool, full, db_printf, vfs_vnode_print); } extern struct pool bufpool; void db_show_all_bufs(db_expr_t addr, int have_addr, db_expr_t count, char *modif) { int full = 0; if (modif[0] == 'f') full = 1; pool_walk(&bufpool, full, db_printf, vfs_buf_print); } /*ARGSUSED*/ void db_object_print_cmd(db_expr_t addr, int have_addr, db_expr_t count, char *modif) { int full = 0; if (modif[0] == 'f') full = 1; uvm_object_printit((struct uvm_object *) addr, full, db_printf); } /*ARGSUSED*/ void db_page_print_cmd(db_expr_t addr, int have_addr, db_expr_t count, char *modif) { int full = 0; if (modif[0] == 'f') full = 1; uvm_page_printit((struct vm_page *) addr, full, db_printf); } /*ARGSUSED*/ void db_vnode_print_cmd(db_expr_t addr, int have_addr, db_expr_t count, char *modif) { int full = 0; if (modif[0] == 'f') full = 1; vfs_vnode_print((void *)addr, full, db_printf); } #ifdef NFSCLIENT /*ARGSUSED*/ void db_nfsreq_print_cmd(db_expr_t addr, int have_addr, db_expr_t count, char *modif) { int full = 0; if (modif[0] == 'f') full = 1; nfs_request_print((void *)addr, full, db_printf); } /*ARGSUSED*/ void db_nfsnode_print_cmd(db_expr_t addr, int have_addr, db_expr_t count, char *modif) { int full = 0; if (modif[0] == 'f') full = 1; nfs_node_print((void *)addr, full, db_printf); } #endif /*ARGSUSED*/ void db_show_panic_cmd(db_expr_t addr, int have_addr, db_expr_t count, char *modif) { if (panicstr) db_printf("%s\n", panicstr); else if (faultstr) { db_printf("kernel page fault\n"); db_printf("%s\n", faultstr); db_stack_trace_print(addr, have_addr, 1, modif, db_printf); } else db_printf("the kernel did not panic\n"); /* yet */ } /*ARGSUSED*/ void db_extent_print_cmd(db_expr_t addr, int have_addr, db_expr_t count, char *modif) { extent_print_all(); } /*ARGSUSED*/ void db_pool_print_cmd(db_expr_t addr, int have_addr, db_expr_t count, char *modif) { pool_printit((struct pool *)addr, modif, db_printf); } /*ARGSUSED*/ void db_proc_print_cmd(db_expr_t addr, int have_addr, db_expr_t count, char *modif) { if (!have_addr) addr = (db_expr_t)curproc; proc_printit((struct proc *)addr, modif, db_printf); } /*ARGSUSED*/ void db_uvmexp_print_cmd(db_expr_t addr, int have_addr, db_expr_t count, char *modif) { uvmexp_print(db_printf); } void bcstats_print(int (*)(const char *, ...)); /*ARGSUSED*/ void db_bcstats_print_cmd(db_expr_t addr, int have_addr, db_expr_t count, char *modif) { bcstats_print(db_printf); } /* * 'show' commands */ struct db_command db_show_all_cmds[] = { { "procs", db_show_all_procs, 0, NULL }, { "callout", db_show_callout, 0, NULL }, { "pools", db_show_all_pools, 0, NULL }, { "mounts", db_show_all_mounts, 0, NULL }, { "vnodes", db_show_all_vnodes, 0, NULL }, { "bufs", db_show_all_bufs, 0, NULL }, #ifdef NFSCLIENT { "nfsreqs", db_show_all_nfsreqs, 0, NULL }, { "nfsnodes", db_show_all_nfsnodes, 0, NULL }, #endif #ifdef WITNESS { "locks", db_witness_list_all, 0, NULL }, #endif { NULL, NULL, 0, NULL } }; struct db_command db_show_cmds[] = { { "all", NULL, 0, db_show_all_cmds }, { "bcstats", db_bcstats_print_cmd, 0, NULL }, { "breaks", db_listbreak_cmd, 0, NULL }, { "buf", db_buf_print_cmd, 0, NULL }, { "extents", db_extent_print_cmd, 0, NULL }, #ifdef WITNESS { "locks", db_witness_list, 0, NULL }, #endif { "malloc", db_malloc_print_cmd, 0, NULL }, { "map", db_map_print_cmd, 0, NULL }, { "mbuf", db_mbuf_print_cmd, 0, NULL }, { "mount", db_mount_print_cmd, 0, NULL }, #ifdef NFSCLIENT { "nfsreq", db_nfsreq_print_cmd, 0, NULL }, { "nfsnode", db_nfsnode_print_cmd, 0, NULL }, #endif { "object", db_object_print_cmd, 0, NULL }, { "page", db_page_print_cmd, 0, NULL }, { "panic", db_show_panic_cmd, 0, NULL }, { "pool", db_pool_print_cmd, 0, NULL }, { "proc", db_proc_print_cmd, 0, NULL }, { "registers", db_show_regs, 0, NULL }, { "socket", db_socket_print_cmd, 0, NULL }, { "struct", db_ctf_show_struct, CS_OWN, NULL }, { "uvmexp", db_uvmexp_print_cmd, 0, NULL }, { "vnode", db_vnode_print_cmd, 0, NULL }, { "watches", db_listwatch_cmd, 0, NULL }, #ifdef WITNESS { "witness", db_witness_display, 0, NULL }, #endif { NULL, NULL, 0, NULL } }; struct db_command db_boot_cmds[] = { { "sync", db_boot_sync_cmd, 0, 0 }, { "crash", db_boot_crash_cmd, 0, 0 }, { "dump", db_boot_dump_cmd, 0, 0 }, { "halt", db_boot_halt_cmd, 0, 0 }, { "reboot", db_boot_reboot_cmd, 0, 0 }, { "poweroff", db_boot_poweroff_cmd, 0, 0 }, { NULL, } }; struct db_command db_command_table[] = { #ifdef DB_MACHINE_COMMANDS /* this must be the first entry, if it exists */ { "machine", NULL, 0, NULL}, #endif { "kill", db_kill_cmd, 0, NULL }, { "print", db_print_cmd, 0, NULL }, { "p", db_print_cmd, 0, NULL }, { "pprint", db_ctf_pprint_cmd, CS_OWN, NULL }, { "examine", db_examine_cmd, CS_SET_DOT, NULL }, { "x", db_examine_cmd, CS_SET_DOT, NULL }, { "search", db_search_cmd, CS_OWN|CS_SET_DOT, NULL }, { "set", db_set_cmd, CS_OWN, NULL }, { "write", db_write_cmd, CS_MORE|CS_SET_DOT, NULL }, { "w", db_write_cmd, CS_MORE|CS_SET_DOT, NULL }, { "delete", db_delete_cmd, 0, NULL }, { "d", db_delete_cmd, 0, NULL }, { "break", db_breakpoint_cmd, 0, NULL }, { "dwatch", db_deletewatch_cmd, 0, NULL }, { "watch", db_watchpoint_cmd, CS_MORE, NULL }, { "step", db_single_step_cmd, 0, NULL }, { "s", db_single_step_cmd, 0, NULL }, { "continue", db_continue_cmd, 0, NULL }, { "c", db_continue_cmd, 0, NULL }, { "until", db_trace_until_call_cmd,0, NULL }, { "next", db_trace_until_matching_cmd,0, NULL }, { "match", db_trace_until_matching_cmd,0, NULL }, { "trace", db_stack_trace_cmd, 0, NULL }, { "bt", db_stack_trace_cmd, 0, NULL }, { "call", db_fncall, CS_OWN, NULL }, { "ps", db_show_all_procs, 0, NULL }, { "callout", db_show_callout, 0, NULL }, { "show", NULL, 0, db_show_cmds }, { "boot", NULL, 0, db_boot_cmds }, { "help", db_help_cmd, 0, NULL }, { "hangman", db_hangman, 0, NULL }, { "dmesg", db_dmesg_cmd, 0, NULL }, { NULL, NULL, 0, NULL } }; #ifdef DB_MACHINE_COMMANDS /* this function should be called to install the machine dependent commands. It should be called before the debugger is enabled */ void db_machine_commands_install(struct db_command *ptr) { db_command_table[0].more = ptr; return; } #endif struct db_command *db_last_command = NULL; void db_help_cmd(db_expr_t addr, int haddr, db_expr_t count, char *modif) { db_cmd_list(db_command_table); } void db_command_loop(void) { label_t db_jmpbuf; label_t *savejmp; extern int db_output_line; /* * Initialize 'prev' and 'next' to dot. */ db_prev = db_dot; db_next = db_dot; db_cmd_loop_done = 0; savejmp = db_recover; db_recover = &db_jmpbuf; (void) setjmp(&db_jmpbuf); while (!db_cmd_loop_done) { if (db_print_position() != 0) db_printf("\n"); db_output_line = 0; #ifdef MULTIPROCESSOR db_printf("ddb{%d}> ", CPU_INFO_UNIT(curcpu())); #else db_printf("ddb> "); #endif (void) db_read_line(); db_command(&db_last_command, db_command_table); } db_recover = savejmp; } void db_error(char *s) { if (s) db_printf("%s", s); db_flush_lex(); if (db_recover != NULL) longjmp(db_recover); } /* * Call random function: * !expr(arg,arg,arg) */ /*ARGSUSED*/ void db_fncall(db_expr_t addr, int have_addr, db_expr_t count, char *modif) { db_expr_t fn_addr; #define MAXARGS 11 db_expr_t args[MAXARGS]; int nargs = 0; db_expr_t retval; db_expr_t (*func)(db_expr_t, ...); int t; char tmpfmt[28]; if (!db_expression(&fn_addr)) { db_printf("Bad function\n"); db_flush_lex(); return; } func = (db_expr_t (*)(db_expr_t, ...)) fn_addr; t = db_read_token(); if (t == tLPAREN) { if (db_expression(&args[0])) { nargs++; while ((t = db_read_token()) == tCOMMA) { if (nargs == MAXARGS) { db_printf("Too many arguments\n"); db_flush_lex(); return; } if (!db_expression(&args[nargs])) { db_printf("Argument missing\n"); db_flush_lex(); return; } nargs++; } db_unread_token(t); } if (db_read_token() != tRPAREN) { db_printf("?\n"); db_flush_lex(); return; } } db_skip_to_eol(); while (nargs < MAXARGS) { args[nargs++] = 0; } retval = (*func)(args[0], args[1], args[2], args[3], args[4], args[5], args[6], args[7], args[8], args[9]); db_printf("%s\n", db_format(tmpfmt, sizeof tmpfmt, retval, DB_FORMAT_N, 1, 0)); } void db_reboot(int howto) { spl0(); if (!curproc) curproc = &proc0; reboot(howto); } void db_boot_sync_cmd(db_expr_t addr, int haddr, db_expr_t count, char *modif) { db_reboot(RB_AUTOBOOT | RB_TIMEBAD | RB_USERREQ); } void db_boot_crash_cmd(db_expr_t addr, int haddr, db_expr_t count, char *modif) { db_reboot(RB_NOSYNC | RB_DUMP | RB_TIMEBAD | RB_USERREQ); } void db_boot_dump_cmd(db_expr_t addr, int haddr, db_expr_t count, char *modif) { db_reboot(RB_DUMP | RB_TIMEBAD | RB_USERREQ); } void db_boot_halt_cmd(db_expr_t addr, int haddr, db_expr_t count, char *modif) { db_reboot(RB_NOSYNC | RB_HALT | RB_TIMEBAD | RB_USERREQ); } void db_boot_reboot_cmd(db_expr_t addr, int haddr, db_expr_t count, char *modif) { boot(RB_RESET | RB_AUTOBOOT | RB_NOSYNC | RB_TIMEBAD | RB_USERREQ); } void db_boot_poweroff_cmd(db_expr_t addr, int haddr, db_expr_t count, char *modif) { db_reboot(RB_NOSYNC | RB_HALT | RB_POWERDOWN | RB_TIMEBAD | RB_USERREQ); } void db_dmesg_cmd(db_expr_t addr, int haddr, db_expr_t count, char *modif) { int i, off; char *p; if (!msgbufp || msgbufp->msg_magic != MSG_MAGIC) return; off = msgbufp->msg_bufx; if (off > msgbufp->msg_bufs) off = 0; for (i = 0, p = msgbufp->msg_bufc + off; i < msgbufp->msg_bufs; i++, p++) { if (p >= msgbufp->msg_bufc + msgbufp->msg_bufs) p = msgbufp->msg_bufc; if (*p != '\0') db_putchar(*p); } db_putchar('\n'); } void db_stack_trace_cmd(db_expr_t addr, int have_addr, db_expr_t count, char *modif) { db_stack_trace_print(addr, have_addr, count, modif, db_printf); } void db_show_regs(db_expr_t addr, int have_addr, db_expr_t count, char *modif) { struct db_variable *regp; db_expr_t value, offset; char * name; char tmpfmt[28]; for (regp = db_regs; regp < db_eregs; regp++) { db_read_variable(regp, &value); db_printf("%-12s%s", regp->name, db_format(tmpfmt, sizeof tmpfmt, (long)value, DB_FORMAT_N, 1, sizeof(long) * 3)); db_find_xtrn_sym_and_offset((vaddr_t)value, &name, &offset); if (name != 0 && offset <= db_maxoff && offset != value) { db_printf("\t%s", name); if (offset != 0) db_printf("+%s", db_format(tmpfmt, sizeof tmpfmt, (long)offset, DB_FORMAT_R, 1, 0)); } db_printf("\n"); } db_print_loc_and_inst(PC_REGS(&ddb_regs)); } /* * Write to file. */ /*ARGSUSED*/ void db_write_cmd(db_expr_t address, int have_addr, db_expr_t count, char *modif) { vaddr_t addr; db_expr_t old_value; db_expr_t new_value; int size, wrote_one = 0; char tmpfmt[28]; addr = (vaddr_t) address; switch (modif[0]) { case 'b': size = 1; break; case 'h': size = 2; break; case 'l': case '\0': size = 4; break; #ifdef __LP64__ case 'q': size = 8; break; #endif default: size = -1; db_error("Unknown size\n"); /*NOTREACHED*/ } while (db_expression(&new_value)) { old_value = db_get_value(addr, size, 0); db_printsym(addr, DB_STGY_ANY, db_printf); db_printf("\t\t%s\t", db_format(tmpfmt, sizeof tmpfmt, old_value, DB_FORMAT_N, 0, 8)); db_printf("=\t%s\n", db_format(tmpfmt, sizeof tmpfmt, new_value, DB_FORMAT_N, 0, 8)); db_put_value(addr, size, new_value); addr += size; wrote_one = 1; } if (!wrote_one) { db_error("Nothing written.\n"); /*NOTREACHED*/ } db_next = addr; db_prev = addr - size; db_skip_to_eol(); }