384 lines
8.5 KiB
C
384 lines
8.5 KiB
C
/* $NetBSD: db_run.c,v 1.10 1997/02/06 21:17:16 gwr Exp $ */
|
|
|
|
/*
|
|
* 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
|
|
* 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 the
|
|
* rights to redistribute these changes.
|
|
*
|
|
* Author: David B. Golub, Carnegie Mellon University
|
|
* Date: 7/90
|
|
*/
|
|
|
|
/*
|
|
* Commands to run process.
|
|
*/
|
|
#include <sys/param.h>
|
|
#include <sys/proc.h>
|
|
|
|
#include <machine/db_machdep.h>
|
|
|
|
#include <ddb/db_run.h>
|
|
#include <ddb/db_lex.h>
|
|
#include <ddb/db_break.h>
|
|
#include <ddb/db_access.h>
|
|
#include <ddb/db_watch.h>
|
|
#include <ddb/db_output.h>
|
|
#include <ddb/db_sym.h>
|
|
#include <ddb/db_extern.h>
|
|
|
|
int db_run_mode;
|
|
#define STEP_NONE 0
|
|
#define STEP_ONCE 1
|
|
#define STEP_RETURN 2
|
|
#define STEP_CALLT 3
|
|
#define STEP_CONTINUE 4
|
|
#define STEP_INVISIBLE 5
|
|
#define STEP_COUNT 6
|
|
|
|
boolean_t db_sstep_print;
|
|
int db_loop_count;
|
|
int db_call_depth;
|
|
|
|
boolean_t
|
|
db_stop_at_pc(regs, is_breakpoint)
|
|
db_regs_t *regs;
|
|
boolean_t *is_breakpoint;
|
|
{
|
|
register db_addr_t pc;
|
|
register db_breakpoint_t bkpt;
|
|
|
|
db_clear_single_step(regs);
|
|
db_clear_breakpoints();
|
|
db_clear_watchpoints();
|
|
pc = PC_REGS(regs);
|
|
|
|
#ifdef FIXUP_PC_AFTER_BREAK
|
|
if (*is_breakpoint) {
|
|
/*
|
|
* Breakpoint trap. Fix up the PC if the
|
|
* machine requires it.
|
|
*/
|
|
FIXUP_PC_AFTER_BREAK(regs);
|
|
pc = PC_REGS(regs);
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Now check for a breakpoint at this address.
|
|
*/
|
|
bkpt = db_find_breakpoint_here(pc);
|
|
if (bkpt) {
|
|
if (--bkpt->count == 0) {
|
|
bkpt->count = bkpt->init_count;
|
|
*is_breakpoint = TRUE;
|
|
return (TRUE); /* stop here */
|
|
}
|
|
} else if (*is_breakpoint) {
|
|
PC_REGS(regs) += BKPT_SIZE;
|
|
}
|
|
|
|
*is_breakpoint = FALSE;
|
|
|
|
if (db_run_mode == STEP_INVISIBLE) {
|
|
db_run_mode = STEP_CONTINUE;
|
|
return (FALSE); /* continue */
|
|
}
|
|
if (db_run_mode == STEP_COUNT) {
|
|
return (FALSE); /* continue */
|
|
}
|
|
if (db_run_mode == STEP_ONCE) {
|
|
if (--db_loop_count > 0) {
|
|
if (db_sstep_print) {
|
|
db_printf("\t\t");
|
|
db_print_loc_and_inst(pc);
|
|
db_printf("\n");
|
|
}
|
|
return (FALSE); /* continue */
|
|
}
|
|
}
|
|
if (db_run_mode == STEP_RETURN) {
|
|
db_expr_t ins = db_get_value(pc, sizeof(int), FALSE);
|
|
|
|
/* continue until matching return */
|
|
|
|
if (!inst_trap_return(ins) &&
|
|
(!inst_return(ins) || --db_call_depth != 0)) {
|
|
if (db_sstep_print) {
|
|
if (inst_call(ins) || inst_return(ins)) {
|
|
register int i;
|
|
|
|
db_printf("[after %6d] ", db_inst_count);
|
|
for (i = db_call_depth; --i > 0; )
|
|
db_printf(" ");
|
|
db_print_loc_and_inst(pc);
|
|
db_printf("\n");
|
|
}
|
|
}
|
|
if (inst_call(ins))
|
|
db_call_depth++;
|
|
return (FALSE); /* continue */
|
|
}
|
|
}
|
|
if (db_run_mode == STEP_CALLT) {
|
|
db_expr_t ins = db_get_value(pc, sizeof(int), FALSE);
|
|
|
|
/* continue until call or return */
|
|
|
|
if (!inst_call(ins) &&
|
|
!inst_return(ins) &&
|
|
!inst_trap_return(ins)) {
|
|
return (FALSE); /* continue */
|
|
}
|
|
}
|
|
db_run_mode = STEP_NONE;
|
|
return (TRUE);
|
|
}
|
|
|
|
void
|
|
db_restart_at_pc(regs, watchpt)
|
|
db_regs_t *regs;
|
|
boolean_t watchpt;
|
|
{
|
|
register db_addr_t pc = PC_REGS(regs);
|
|
|
|
if ((db_run_mode == STEP_COUNT) ||
|
|
(db_run_mode == STEP_RETURN) ||
|
|
(db_run_mode == STEP_CALLT)) {
|
|
db_expr_t ins;
|
|
|
|
/*
|
|
* We are about to execute this instruction,
|
|
* so count it now.
|
|
*/
|
|
|
|
ins = db_get_value(pc, sizeof(int), FALSE);
|
|
db_inst_count++;
|
|
db_load_count += inst_load(ins);
|
|
db_store_count += inst_store(ins);
|
|
#if defined(SOFTWARE_SSTEP) && defined(__mips__)
|
|
/* XXX works on mips, but... */
|
|
if (inst_branch(ins) || inst_call(ins)) {
|
|
ins = db_get_value(next_instr_address(pc,1),
|
|
sizeof(int), FALSE);
|
|
db_inst_count++;
|
|
db_load_count += inst_load(ins);
|
|
db_store_count += inst_store(ins);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
if (db_run_mode == STEP_CONTINUE) {
|
|
if (watchpt || db_find_breakpoint_here(pc)) {
|
|
/*
|
|
* Step over breakpoint/watchpoint.
|
|
*/
|
|
db_run_mode = STEP_INVISIBLE;
|
|
db_set_single_step(regs);
|
|
} else {
|
|
db_set_breakpoints();
|
|
db_set_watchpoints();
|
|
}
|
|
} else {
|
|
db_set_single_step(regs);
|
|
}
|
|
}
|
|
|
|
void
|
|
db_single_step(regs)
|
|
db_regs_t *regs;
|
|
{
|
|
if (db_run_mode == STEP_CONTINUE) {
|
|
db_run_mode = STEP_INVISIBLE;
|
|
db_set_single_step(regs);
|
|
}
|
|
}
|
|
|
|
#ifdef SOFTWARE_SSTEP
|
|
/*
|
|
* Software implementation of single-stepping.
|
|
* If your machine does not have a trace mode
|
|
* similar to the vax or sun ones you can use
|
|
* this implementation, done for the mips.
|
|
* Just define the above conditional and provide
|
|
* the functions/macros defined below.
|
|
*
|
|
* extern boolean_t
|
|
* inst_branch(), returns true if the instruction might branch
|
|
* extern unsigned
|
|
* branch_taken(), return the address the instruction might
|
|
* branch to
|
|
* db_getreg_val(); return the value of a user register,
|
|
* as indicated in the hardware instruction
|
|
* encoding, e.g. 8 for r8
|
|
*
|
|
* next_instr_address(pc,bd) returns the address of the first
|
|
* instruction following the one at "pc",
|
|
* which is either in the taken path of
|
|
* the branch (bd==1) or not. This is
|
|
* for machines (mips) with branch delays.
|
|
*
|
|
* A single-step may involve at most 2 breakpoints -
|
|
* one for branch-not-taken and one for branch taken.
|
|
* If one of these addresses does not already have a breakpoint,
|
|
* we allocate a breakpoint and save it here.
|
|
* These breakpoints are deleted on return.
|
|
*/
|
|
db_breakpoint_t db_not_taken_bkpt = 0;
|
|
db_breakpoint_t db_taken_bkpt = 0;
|
|
|
|
void
|
|
db_set_single_step(regs)
|
|
register db_regs_t *regs;
|
|
{
|
|
db_addr_t pc = PC_REGS(regs), brpc;
|
|
register unsigned inst;
|
|
|
|
/*
|
|
* User was stopped at pc, e.g. the instruction
|
|
* at pc was not executed.
|
|
*/
|
|
inst = db_get_value(pc, sizeof(int), FALSE);
|
|
if (inst_branch(inst) || inst_call(inst)) {
|
|
|
|
brpc = branch_taken(inst, pc, regs);
|
|
if (brpc != pc) { /* self-branches are hopeless */
|
|
db_taken_bkpt = db_set_temp_breakpoint(brpc);
|
|
}
|
|
pc = next_instr_address(pc,1);
|
|
}
|
|
pc = next_instr_address(pc,0);
|
|
db_not_taken_bkpt = db_set_temp_breakpoint(pc);
|
|
}
|
|
|
|
void
|
|
db_clear_single_step(regs)
|
|
db_regs_t *regs;
|
|
{
|
|
|
|
if (db_taken_bkpt != 0) {
|
|
db_delete_temp_breakpoint(db_taken_bkpt);
|
|
db_taken_bkpt = 0;
|
|
}
|
|
if (db_not_taken_bkpt != 0) {
|
|
db_delete_temp_breakpoint(db_not_taken_bkpt);
|
|
db_not_taken_bkpt = 0;
|
|
}
|
|
}
|
|
|
|
#endif SOFTWARE_SSTEP
|
|
|
|
extern int db_cmd_loop_done;
|
|
|
|
/* single-step */
|
|
/*ARGSUSED*/
|
|
void
|
|
db_single_step_cmd(addr, have_addr, count, modif)
|
|
db_expr_t addr;
|
|
int have_addr;
|
|
db_expr_t count;
|
|
char * modif;
|
|
{
|
|
boolean_t print = FALSE;
|
|
|
|
if (count == -1)
|
|
count = 1;
|
|
|
|
if (modif[0] == 'p')
|
|
print = TRUE;
|
|
|
|
db_run_mode = STEP_ONCE;
|
|
db_loop_count = count;
|
|
db_sstep_print = print;
|
|
db_inst_count = 0;
|
|
db_load_count = 0;
|
|
db_store_count = 0;
|
|
|
|
db_cmd_loop_done = 1;
|
|
}
|
|
|
|
/* trace and print until call/return */
|
|
/*ARGSUSED*/
|
|
void
|
|
db_trace_until_call_cmd(addr, have_addr, count, modif)
|
|
db_expr_t addr;
|
|
int have_addr;
|
|
db_expr_t count;
|
|
char * modif;
|
|
{
|
|
boolean_t print = FALSE;
|
|
|
|
if (modif[0] == 'p')
|
|
print = TRUE;
|
|
|
|
db_run_mode = STEP_CALLT;
|
|
db_sstep_print = print;
|
|
db_inst_count = 0;
|
|
db_load_count = 0;
|
|
db_store_count = 0;
|
|
|
|
db_cmd_loop_done = 1;
|
|
}
|
|
|
|
/*ARGSUSED*/
|
|
void
|
|
db_trace_until_matching_cmd(addr, have_addr, count, modif)
|
|
db_expr_t addr;
|
|
int have_addr;
|
|
db_expr_t count;
|
|
char * modif;
|
|
{
|
|
boolean_t print = FALSE;
|
|
|
|
if (modif[0] == 'p')
|
|
print = TRUE;
|
|
|
|
db_run_mode = STEP_RETURN;
|
|
db_call_depth = 1;
|
|
db_sstep_print = print;
|
|
db_inst_count = 0;
|
|
db_load_count = 0;
|
|
db_store_count = 0;
|
|
|
|
db_cmd_loop_done = 1;
|
|
}
|
|
|
|
/* continue */
|
|
/*ARGSUSED*/
|
|
void
|
|
db_continue_cmd(addr, have_addr, count, modif)
|
|
db_expr_t addr;
|
|
int have_addr;
|
|
db_expr_t count;
|
|
char * modif;
|
|
{
|
|
if (modif[0] == 'c')
|
|
db_run_mode = STEP_COUNT;
|
|
else
|
|
db_run_mode = STEP_CONTINUE;
|
|
db_inst_count = 0;
|
|
db_load_count = 0;
|
|
db_store_count = 0;
|
|
|
|
db_cmd_loop_done = 1;
|
|
}
|