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/*
* Mach Operating System
* Copyright (c) 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.
*/
#if MACH_KDB
#include <machine/db_machdep.h>
#include <machine/setjmp.h>
#include <ddb/db_lex.h>
#include <ddb/db_break.h>
#include <ddb/db_command.h>
#include <ddb/db_cond.h>
#include <ddb/db_expr.h>
#include <ddb/db_output.h>
#include <kern/debug.h>
#define DB_MAX_COND 10 /* maximum conditions to be set */
int db_ncond_free = DB_MAX_COND; /* free condition */
struct db_cond {
int c_size; /* size of cond */
char c_cond_cmd[DB_LEX_LINE_SIZE]; /* cond & cmd */
} db_cond[DB_MAX_COND];
void
db_cond_free(db_thread_breakpoint_t bkpt)
{
if (bkpt->tb_cond > 0) {
db_cond[bkpt->tb_cond-1].c_size = 0;
db_ncond_free++;
bkpt->tb_cond = 0;
}
}
boolean_t
db_cond_check(db_thread_breakpoint_t bkpt)
{
struct db_cond *cp;
db_expr_t value;
int t;
jmp_buf_t db_jmpbuf;
extern jmp_buf_t *db_recover;
if (bkpt->tb_cond <= 0) /* no condition */
return(TRUE);
db_dot = PC_REGS(DDB_REGS);
db_prev = db_dot;
db_next = db_dot;
if (_setjmp(db_recover = &db_jmpbuf)) {
/*
* in case of error, return true to enter interactive mode
*/
return(TRUE);
}
/*
* switch input, and evalutate condition
*/
cp = &db_cond[bkpt->tb_cond - 1];
db_switch_input(cp->c_cond_cmd, cp->c_size);
if (!db_expression(&value)) {
db_printf("error: condition evaluation error\n");
return(TRUE);
}
if (value == 0 || --(bkpt->tb_count) > 0)
return(FALSE);
/*
* execute a command list if exist
*/
bkpt->tb_count = bkpt->tb_init_count;
if ((t = db_read_token()) != tEOL) {
db_unread_token(t);
return(db_exec_cmd_nest(0, 0));
}
return(TRUE);
}
void
db_cond_print(bkpt)
const db_thread_breakpoint_t bkpt;
{
char *p, *ep;
struct db_cond *cp;
if (bkpt->tb_cond <= 0)
return;
cp = &db_cond[bkpt->tb_cond-1];
p = cp->c_cond_cmd;
ep = p + cp->c_size;
while (p < ep) {
if (*p == '\n' || *p == 0)
break;
db_putchar(*p++);
}
}
void
db_cond_cmd(void)
{
int c;
struct db_cond *cp;
char *p;
db_expr_t value;
db_thread_breakpoint_t bkpt;
if (db_read_token() != tHASH || db_read_token() != tNUMBER) {
db_printf("#<number> expected instead of \"%s\"\n", db_tok_string);
db_error(0);
return;
}
if ((bkpt = db_find_breakpoint_number(db_tok_number, 0)) == 0) {
db_printf("No such break point #%d\n", db_tok_number);
db_error(0);
return;
}
/*
* if the break point already has a condition, free it first
*/
if (bkpt->tb_cond > 0) {
cp = &db_cond[bkpt->tb_cond - 1];
db_cond_free(bkpt);
} else {
if (db_ncond_free <= 0) {
db_error("Too many conditions\n");
return;
}
for (cp = db_cond; cp < &db_cond[DB_MAX_COND]; cp++)
if (cp->c_size == 0)
break;
if (cp >= &db_cond[DB_MAX_COND])
panic("bad db_cond_free");
}
for (c = db_read_char(); c == ' ' || c == '\t'; c = db_read_char());
for (p = cp->c_cond_cmd; c >= 0; c = db_read_char())
*p++ = c;
/*
* switch to saved data and call db_expression to check the condition.
* If no condition is supplied, db_expression will return false.
* In this case, clear previous condition of the break point.
* If condition is supplied, set the condition to the permanent area.
* Note: db_expression will not return here, if the condition
* expression is wrong.
*/
db_switch_input(cp->c_cond_cmd, p - cp->c_cond_cmd);
if (!db_expression(&value)) {
/* since condition is already freed, do nothing */
db_flush_lex();
return;
}
db_flush_lex();
db_ncond_free--;
cp->c_size = p - cp->c_cond_cmd;
bkpt->tb_cond = (cp - db_cond) + 1;
}
#endif /* MACH_KDB */
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