1 /* $OpenBSD: db_output.c,v 1.32 2018/05/07 15:52:47 visa Exp $ */ 2 /* $NetBSD: db_output.c,v 1.13 1996/04/01 17:27:14 christos Exp $ */ 3 4 /* 5 * Mach Operating System 6 * Copyright (c) 1993,1992,1991,1990 Carnegie Mellon University 7 * All Rights Reserved. 8 * 9 * Permission to use, copy, modify and distribute this software and its 10 * documentation is hereby granted, provided that both the copyright 11 * notice and this permission notice appear in all copies of the 12 * software, derivative works or modified versions, and any portions 13 * thereof, and that both notices appear in supporting documentation. 14 * 15 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 16 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR 17 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 18 * 19 * Carnegie Mellon requests users of this software to return to 20 * 21 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU 22 * School of Computer Science 23 * Carnegie Mellon University 24 * Pittsburgh PA 15213-3890 25 * 26 * any improvements or extensions that they make and grant Carnegie Mellon 27 * the rights to redistribute these changes. 28 */ 29 30 /* 31 * Printf and character output for debugger. 32 */ 33 #include <sys/param.h> 34 #include <sys/stdarg.h> 35 #include <sys/systm.h> 36 37 #include <dev/cons.h> 38 39 #include <machine/db_machdep.h> 40 41 #include <ddb/db_command.h> 42 #include <ddb/db_output.h> 43 #include <ddb/db_access.h> 44 #include <ddb/db_interface.h> 45 #include <ddb/db_sym.h> 46 #include <ddb/db_var.h> 47 48 /* 49 * Character output - tracks position in line. 50 * To do this correctly, we should know how wide 51 * the output device is - then we could zero 52 * the line position when the output device wraps 53 * around to the start of the next line. 54 * 55 * Instead, we count the number of spaces printed 56 * since the last printing character so that we 57 * don't print trailing spaces. This avoids most 58 * of the wraparounds. 59 */ 60 61 #ifndef DB_MAX_LINE 62 #define DB_MAX_LINE 24 /* maximum line */ 63 #define DB_MAX_WIDTH 80 /* maximum width */ 64 #endif /* DB_MAX_LINE */ 65 66 #define DB_MIN_MAX_WIDTH 20 /* minimum max width */ 67 #define DB_MIN_MAX_LINE 3 /* minimum max line */ 68 #define CTRL(c) ((c) & 0xff) 69 70 int db_output_position = 0; /* output column */ 71 int db_output_line = 0; /* output line number */ 72 int db_last_non_space = 0; /* last non-space character */ 73 int db_tab_stop_width = 8; /* how wide are tab stops? */ 74 #define NEXT_TAB(i) \ 75 ((((i) + db_tab_stop_width) / db_tab_stop_width) * db_tab_stop_width) 76 int db_max_line = DB_MAX_LINE; /* output max lines */ 77 int db_max_width = DB_MAX_WIDTH; /* output line width */ 78 int db_radix = 16; /* output numbers radix */ 79 80 static void db_more(void); 81 82 /* 83 * Force pending whitespace. 84 */ 85 void 86 db_force_whitespace(void) 87 { 88 int last_print, next_tab; 89 90 last_print = db_last_non_space; 91 while (last_print < db_output_position) { 92 next_tab = NEXT_TAB(last_print); 93 if (next_tab <= db_output_position) { 94 while (last_print < next_tab) { /* DON'T send a tab!!! */ 95 cnputc(' '); 96 last_print++; 97 } 98 } 99 else { 100 cnputc(' '); 101 last_print++; 102 } 103 } 104 db_last_non_space = db_output_position; 105 } 106 107 static void 108 db_more(void) 109 { 110 char *p; 111 int quit_output = 0; 112 113 for (p = "--db_more--"; *p; p++) 114 cnputc(*p); 115 switch(cngetc()) { 116 case ' ': 117 db_output_line = 0; 118 break; 119 case 'q': 120 case CTRL('c'): 121 db_output_line = 0; 122 quit_output = 1; 123 break; 124 default: 125 db_output_line--; 126 break; 127 } 128 p = "\b\b\b\b\b\b\b\b\b\b\b \b\b\b\b\b\b\b\b\b\b\b"; 129 while (*p) 130 cnputc(*p++); 131 if (quit_output) { 132 db_error(0); 133 /* NOTREACHED */ 134 } 135 } 136 137 /* 138 * Output character. Buffer whitespace. 139 */ 140 void 141 db_putchar(int c) 142 { 143 if (db_max_line >= DB_MIN_MAX_LINE && db_output_line >= db_max_line-1) 144 db_more(); 145 146 if (c > ' ' && c <= '~') { 147 /* 148 * Printing character. 149 * If we have spaces to print, print them first. 150 * Use tabs if possible. 151 */ 152 db_force_whitespace(); 153 cnputc(c); 154 db_output_position++; 155 if (db_max_width >= DB_MIN_MAX_WIDTH 156 && db_output_position >= db_max_width-1) { 157 /* auto new line */ 158 cnputc('\n'); 159 db_output_position = 0; 160 db_last_non_space = 0; 161 db_output_line++; 162 } 163 db_last_non_space = db_output_position; 164 } 165 else if (c == '\n') { 166 /* Return */ 167 cnputc(c); 168 db_output_position = 0; 169 db_last_non_space = 0; 170 db_output_line++; 171 } 172 else if (c == '\t') { 173 /* assume tabs every 8 positions */ 174 db_output_position = NEXT_TAB(db_output_position); 175 } 176 else if (c == ' ') { 177 /* space */ 178 db_output_position++; 179 } 180 else if (c == '\007') { 181 /* bell */ 182 cnputc(c); 183 } 184 /* other characters are assumed non-printing */ 185 } 186 187 /* 188 * Return output position 189 */ 190 int 191 db_print_position(void) 192 { 193 return (db_output_position); 194 } 195 196 /* 197 * End line if too long. 198 */ 199 void 200 db_end_line(int space) 201 { 202 if (db_output_position >= db_max_width - space) 203 db_printf("\n"); 204 } 205 206 char * 207 db_format(char *buf, size_t bufsize, long val, int format, int alt, int width) 208 { 209 const char *fmt; 210 211 if (format == DB_FORMAT_Z || db_radix == 16) 212 fmt = alt ? "-%#*lx" : "-%*lx"; 213 else if (db_radix == 8) 214 fmt = alt ? "-%#*lo" : "-%*lo"; 215 else 216 fmt = alt ? "-%#*lu" : "-%*lu"; 217 218 /* The leading '-' is a nasty (and beautiful) idea from NetBSD */ 219 if (val < 0 && format != DB_FORMAT_N) 220 val = -val; 221 else 222 fmt++; 223 224 snprintf(buf, bufsize, fmt, width, val); 225 226 return (buf); 227 } 228 229 void 230 db_stack_dump(void) 231 { 232 static volatile int intrace; 233 234 if (intrace) { 235 printf("Faulted in traceback, aborting...\n"); 236 return; 237 } 238 239 intrace = 1; 240 printf("Starting stack trace...\n"); 241 db_stack_trace_print((db_expr_t)__builtin_frame_address(0), TRUE, 242 256 /* low limit */, "", printf); 243 printf("End of stack trace.\n"); 244 intrace = 0; 245 } 246 247 void 248 db_print_stack_trace(struct db_stack_trace *st, int (*pr)(const char *, ...)) 249 { 250 unsigned int i; 251 252 for (i = 0; i < st->st_count; i++) { 253 (*pr)("#%-2u ", i); 254 db_printsym(st->st_pc[i], DB_STGY_PROC, pr); 255 (*pr)("\n"); 256 } 257 if (st->st_count == 0) 258 (*pr)("<empty stack trace>\n"); 259 } 260