37224cd3fc
Most of the changes are a direct result of adding thread awareness. Typically, DDB_REGS is gone. All registers are taken from the trapframe and backtraces use the PCB based contexts. DDB_REGS was defined to be a trapframe on all platforms anyway. Thread awareness introduces the following new commands: thread X switch to thread X (where X is the TID), show threads list all threads. The backtrace code has been made more flexible so that one can create backtraces for any thread by giving the thread ID as an argument to trace. With this change, ia64 has support for breakpoints.
292 lines
6.3 KiB
C
292 lines
6.3 KiB
C
/*
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* Mach Operating System
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* Copyright (c) 1991,1990 Carnegie Mellon University
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* All Rights Reserved.
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*
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* Permission to use, copy, modify and distribute this software and its
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* documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation.
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*
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* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS
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* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
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* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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*
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* Carnegie Mellon requests users of this software to return to
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*
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* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
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* School of Computer Science
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* Carnegie Mellon University
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* Pittsburgh PA 15213-3890
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*
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* any improvements or extensions that they make and grant Carnegie the
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* rights to redistribute these changes.
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*/
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/*
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* Author: David B. Golub, Carnegie Mellon University
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* Date: 7/90
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*/
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/*
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* Printf and character output for debugger.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/cons.h>
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#include <sys/kdb.h>
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#include <sys/kernel.h>
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#include <sys/sysctl.h>
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#include <machine/stdarg.h>
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#include <ddb/ddb.h>
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#include <ddb/db_output.h>
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/*
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* Character output - tracks position in line.
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* To do this correctly, we should know how wide
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* the output device is - then we could zero
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* the line position when the output device wraps
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* around to the start of the next line.
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*
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* Instead, we count the number of spaces printed
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* since the last printing character so that we
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* don't print trailing spaces. This avoids most
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* of the wraparounds.
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*/
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static int db_output_position = 0; /* output column */
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static int db_last_non_space = 0; /* last non-space character */
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db_expr_t db_tab_stop_width = 8; /* how wide are tab stops? */
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#define NEXT_TAB(i) \
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((((i) + db_tab_stop_width) / db_tab_stop_width) * db_tab_stop_width)
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db_expr_t db_max_width = 79; /* output line width */
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static int db_newlines; /* # lines this page */
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static int db_maxlines = -1; /* max lines per page */
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static db_page_calloutfcn_t *db_page_callout = NULL;
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static void *db_page_callout_arg = NULL;
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static int ddb_use_printf = 0;
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SYSCTL_INT(_debug, OID_AUTO, ddb_use_printf, CTLFLAG_RW, &ddb_use_printf, 0,
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"use printf for all ddb output");
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static void db_putchar(int c, void *arg);
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/*
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* Force pending whitespace.
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*/
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void
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db_force_whitespace()
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{
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register int last_print, next_tab;
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last_print = db_last_non_space;
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while (last_print < db_output_position) {
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next_tab = NEXT_TAB(last_print);
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if (next_tab <= db_output_position) {
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while (last_print < next_tab) { /* DON'T send a tab!!! */
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cnputc(' ');
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last_print++;
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}
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}
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else {
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cnputc(' ');
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last_print++;
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}
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}
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db_last_non_space = db_output_position;
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}
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/*
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* Output character. Buffer whitespace.
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*/
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static void
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db_putchar(c, arg)
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int c; /* character to output */
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void * arg;
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{
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/*
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* If not in the debugger or the user requests it, output data to
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* both the console and the message buffer.
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*/
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if (!kdb_active || ddb_use_printf) {
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printf("%c", c);
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if (!kdb_active)
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return;
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if (c == '\r' || c == '\n')
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db_check_interrupt();
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if (c == '\n' && db_maxlines > 0 && db_page_callout != NULL) {
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db_newlines++;
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if (db_newlines >= db_maxlines) {
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db_maxlines = -1;
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db_page_callout(db_page_callout_arg);
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}
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}
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return;
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}
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/* Otherwise, output data directly to the console. */
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if (c > ' ' && c <= '~') {
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/*
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* Printing character.
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* If we have spaces to print, print them first.
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* Use tabs if possible.
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*/
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db_force_whitespace();
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cnputc(c);
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db_output_position++;
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db_last_non_space = db_output_position;
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}
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else if (c == '\n') {
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/* Newline */
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cnputc(c);
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db_output_position = 0;
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db_last_non_space = 0;
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db_check_interrupt();
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if (db_maxlines > 0 && db_page_callout != NULL) {
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db_newlines++;
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if (db_newlines >= db_maxlines) {
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db_maxlines = -1;
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db_page_callout(db_page_callout_arg);
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}
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}
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}
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else if (c == '\r') {
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/* Return */
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cnputc(c);
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db_output_position = 0;
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db_last_non_space = 0;
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db_check_interrupt();
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}
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else if (c == '\t') {
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/* assume tabs every 8 positions */
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db_output_position = NEXT_TAB(db_output_position);
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}
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else if (c == ' ') {
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/* space */
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db_output_position++;
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}
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else if (c == '\007') {
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/* bell */
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cnputc(c);
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}
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/* other characters are assumed non-printing */
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}
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/*
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* Register callout for providing a pager for output.
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*/
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void
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db_setup_paging(db_page_calloutfcn_t *callout, void *arg, int maxlines)
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{
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db_page_callout = callout;
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db_page_callout_arg = arg;
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db_maxlines = maxlines;
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db_newlines = 0;
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}
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/*
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* A simple paging callout function. If the argument is not null, it
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* points to an integer that will be set to 1 if the user asks to quit.
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*/
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void
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db_simple_pager(void *arg)
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{
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int c;
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db_printf("--More--\r");
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for (;;) {
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c = cngetc();
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switch (c) {
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case '\n':
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/* Just one more line. */
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db_setup_paging(db_simple_pager, arg, 1);
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return;
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case ' ':
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/* Another page. */
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db_setup_paging(db_simple_pager, arg,
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DB_LINES_PER_PAGE);
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return;
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case 'q':
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case 'Q':
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case 'x':
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case 'X':
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/* Quit */
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if (arg != NULL) {
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*(int *)arg = 1;
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db_printf("\n");
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return;
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}
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#if 0
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/* FALLTHROUGH */
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default:
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cnputc('\007');
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#endif
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}
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}
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}
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/*
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* Return output position
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*/
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int
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db_print_position()
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{
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return (db_output_position);
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}
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/*
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* Printing
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*/
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void
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#if __STDC__
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db_printf(const char *fmt, ...)
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#else
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db_printf(fmt)
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const char *fmt;
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#endif
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{
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va_list listp;
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va_start(listp, fmt);
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kvprintf (fmt, db_putchar, NULL, db_radix, listp);
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va_end(listp);
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}
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int db_indent;
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void
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#if __STDC__
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db_iprintf(const char *fmt,...)
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#else
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db_iprintf(fmt)
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const char *fmt;
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#endif
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{
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register int i;
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va_list listp;
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for (i = db_indent; i >= 8; i -= 8)
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db_printf("\t");
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while (--i >= 0)
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db_printf(" ");
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va_start(listp, fmt);
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kvprintf (fmt, db_putchar, NULL, db_radix, listp);
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va_end(listp);
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}
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/*
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* End line if too long.
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*/
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void
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db_end_line()
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{
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if (db_output_position >= db_max_width)
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db_printf("\n");
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}
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