1 /* $OpenBSD: db_output.c,v 1.34 2020/01/20 15:58:23 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 #include <sys/stacktrace.h> 37 38 #include <dev/cons.h> 39 40 #include <machine/db_machdep.h> 41 42 #include <ddb/db_command.h> 43 #include <ddb/db_output.h> 44 #include <ddb/db_access.h> 45 #include <ddb/db_interface.h> 46 #include <ddb/db_sym.h> 47 #include <ddb/db_var.h> 48 49 /* 50 * Character output - tracks position in line. 51 * To do this correctly, we should know how wide 52 * the output device is - then we could zero 53 * the line position when the output device wraps 54 * around to the start of the next line. 55 * 56 * Instead, we count the number of spaces printed 57 * since the last printing character so that we 58 * don't print trailing spaces. This avoids most 59 * of the wraparounds. 60 */ 61 62 #ifndef DB_MAX_LINE 63 #define DB_MAX_LINE 24 /* maximum line */ 64 #define DB_MAX_WIDTH 80 /* maximum width */ 65 #endif /* DB_MAX_LINE */ 66 67 #define DB_MIN_MAX_WIDTH 20 /* minimum max width */ 68 #define DB_MIN_MAX_LINE 3 /* minimum max line */ 69 #define CTRL(c) ((c) & 0xff) 70 71 int db_output_position = 0; /* output column */ 72 int db_output_line = 0; /* output line number */ 73 int db_last_non_space = 0; /* last non-space character */ 74 int db_tab_stop_width = 8; /* how wide are tab stops? */ 75 #define NEXT_TAB(i) \ 76 ((((i) + db_tab_stop_width) / db_tab_stop_width) * db_tab_stop_width) 77 int db_max_line = DB_MAX_LINE; /* output max lines */ 78 int db_max_width = DB_MAX_WIDTH; /* output line width */ 79 int db_radix = 16; /* output numbers radix */ 80 81 static void db_more(void); 82 83 /* 84 * Force pending whitespace. 85 */ 86 void 87 db_force_whitespace(void) 88 { 89 int last_print, next_tab; 90 91 last_print = db_last_non_space; 92 while (last_print < db_output_position) { 93 next_tab = NEXT_TAB(last_print); 94 if (next_tab <= db_output_position) { 95 while (last_print < next_tab) { /* DON'T send a tab!!! */ 96 cnputc(' '); 97 last_print++; 98 } 99 } 100 else { 101 cnputc(' '); 102 last_print++; 103 } 104 } 105 db_last_non_space = db_output_position; 106 } 107 108 static void 109 db_more(void) 110 { 111 char *p; 112 int quit_output = 0; 113 114 for (p = "--db_more--"; *p; p++) 115 cnputc(*p); 116 switch(cngetc()) { 117 case ' ': 118 db_output_line = 0; 119 break; 120 case 'q': 121 case CTRL('c'): 122 db_output_line = 0; 123 quit_output = 1; 124 break; 125 default: 126 db_output_line--; 127 break; 128 } 129 p = "\b\b\b\b\b\b\b\b\b\b\b \b\b\b\b\b\b\b\b\b\b\b"; 130 while (*p) 131 cnputc(*p++); 132 if (quit_output) { 133 db_error(0); 134 /* NOTREACHED */ 135 } 136 } 137 138 /* 139 * Output character. Buffer whitespace. 140 */ 141 void 142 db_putchar(int c) 143 { 144 if (db_max_line >= DB_MIN_MAX_LINE && db_output_line >= db_max_line-1) 145 db_more(); 146 147 if (c > ' ' && c <= '~') { 148 /* 149 * Printing character. 150 * If we have spaces to print, print them first. 151 * Use tabs if possible. 152 */ 153 db_force_whitespace(); 154 cnputc(c); 155 db_output_position++; 156 if (db_max_width >= DB_MIN_MAX_WIDTH 157 && db_output_position >= db_max_width-1) { 158 /* auto new line */ 159 cnputc('\n'); 160 db_output_position = 0; 161 db_last_non_space = 0; 162 db_output_line++; 163 } 164 db_last_non_space = db_output_position; 165 } 166 else if (c == '\n') { 167 /* Return */ 168 cnputc(c); 169 db_output_position = 0; 170 db_last_non_space = 0; 171 db_output_line++; 172 } 173 else if (c == '\t') { 174 /* assume tabs every 8 positions */ 175 db_output_position = NEXT_TAB(db_output_position); 176 } 177 else if (c == ' ') { 178 /* space */ 179 db_output_position++; 180 } 181 else if (c == '\007') { 182 /* bell */ 183 cnputc(c); 184 } 185 /* other characters are assumed non-printing */ 186 } 187 188 /* 189 * Return output position 190 */ 191 int 192 db_print_position(void) 193 { 194 return (db_output_position); 195 } 196 197 /* 198 * End line if too long. 199 */ 200 void 201 db_end_line(int space) 202 { 203 if (db_output_position >= db_max_width - space) 204 db_printf("\n"); 205 } 206 207 char * 208 db_format(char *buf, size_t bufsize, long val, int format, int alt, int width) 209 { 210 const char *fmt; 211 212 if (format == DB_FORMAT_Z || db_radix == 16) 213 fmt = alt ? "-%#*lx" : "-%*lx"; 214 else if (db_radix == 8) 215 fmt = alt ? "-%#*lo" : "-%*lo"; 216 else 217 fmt = alt ? "-%#*lu" : "-%*lu"; 218 219 /* The leading '-' is a nasty (and beautiful) idea from NetBSD */ 220 if (val < 0 && format != DB_FORMAT_N) 221 val = -val; 222 else 223 fmt++; 224 225 snprintf(buf, bufsize, fmt, width, val); 226 227 return (buf); 228 } 229 230 void 231 db_stack_dump(void) 232 { 233 static volatile int intrace; 234 235 if (intrace) { 236 printf("Faulted in traceback, aborting...\n"); 237 return; 238 } 239 240 intrace = 1; 241 printf("Starting stack trace...\n"); 242 db_stack_trace_print((db_expr_t)__builtin_frame_address(0), 1, 243 256 /* low limit */, "", printf); 244 printf("End of stack trace.\n"); 245 intrace = 0; 246 } 247 248 void 249 stacktrace_print(struct stacktrace *st, int (*pr)(const char *, ...)) 250 { 251 unsigned int i; 252 253 for (i = 0; i < st->st_count; i++) { 254 (*pr)("#%-2u ", i); 255 db_printsym(st->st_pc[i], DB_STGY_PROC, pr); 256 (*pr)("\n"); 257 } 258 if (st->st_count == 0) 259 (*pr)("<empty stack trace>\n"); 260 } 261