NetBSD/sys/ddb/db_run.c

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/* $NetBSD: db_run.c,v 1.12 1997/09/10 19:37:31 pk Exp $ */
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/*
* Mach Operating System
* Copyright (c) 1993-1990 Carnegie Mellon University
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* 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.
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*
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* Author: David B. Golub, Carnegie Mellon University
* Date: 7/90
*/
/*
* Commands to run process.
*/
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#include <sys/param.h>
#include <sys/proc.h>
#include <machine/db_machdep.h>
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#include <ddb/db_run.h>
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#include <ddb/db_lex.h>
#include <ddb/db_break.h>
#include <ddb/db_access.h>
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#include <ddb/db_watch.h>
#include <ddb/db_output.h>
#include <ddb/db_sym.h>
#include <ddb/db_extern.h>
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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
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db_stop_at_pc(regs, is_breakpoint)
db_regs_t *regs;
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boolean_t *is_breakpoint;
{
register db_addr_t pc;
register db_breakpoint_t bkpt;
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db_clear_single_step(regs);
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db_clear_breakpoints();
db_clear_watchpoints();
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pc = PC_REGS(regs);
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#ifdef FIXUP_PC_AFTER_BREAK
if (*is_breakpoint) {
/*
* Breakpoint trap. Fix up the PC if the
* machine requires it.
*/
FIXUP_PC_AFTER_BREAK(regs);
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pc = PC_REGS(regs);
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}
#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) {
#ifdef PC_ADVANCE
PC_ADVANCE(regs);
#else
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PC_REGS(regs) += BKPT_SIZE;
#endif
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}
*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
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db_restart_at_pc(regs, watchpt)
db_regs_t *regs;
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boolean_t watchpt;
{
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register db_addr_t pc = PC_REGS(regs);
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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);
#ifdef SOFTWARE_SSTEP
/*
* Account for instructions in delay slots.
*/
{
db_addr_t brpc;
brpc = next_instr_address(pc, TRUE);
if ((brpc != pc) && (inst_branch(ins) || inst_call(ins))) {
ins = db_get_value(brpc, sizeof(int), FALSE);
db_inst_count++;
db_load_count += inst_load(ins);
db_store_count += inst_store(ins);
}
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}
#endif
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}
if (db_run_mode == STEP_CONTINUE) {
if (watchpt || db_find_breakpoint_here(pc)) {
/*
* Step over breakpoint/watchpoint.
*/
db_run_mode = STEP_INVISIBLE;
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db_set_single_step(regs);
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} else {
db_set_breakpoints();
db_set_watchpoints();
}
} else {
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db_set_single_step(regs);
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}
}
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
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/*
* 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.
*
* boolean_t inst_branch(int inst)
* boolean_t inst_call(int inst)
* returns TRUE if the instruction might branch
*
* boolean_t inst_unconditional_flow_transfer(int inst)
* returns TRUE if the instruction is an unconditional
* transter of flow (i.e. unconditional branch)
*
* db_addr_t branch_taken(int inst, db_addr_t pc, db_regs_t *regs)
* returns the target address of the branch
*
* db_addr_t next_instr_address(db_addr_t pc, boolean_t bd)
* returns the address of the first instruction following the
* one at "pc", which is either in the taken path of the branch
* (bd == TRUE) or not. This is for machines (e.g. mips) with
* branch delays.
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*
* 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;
boolean_t unconditional;
unsigned int inst;
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/*
* 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);
} else
db_taken_bkpt = 0;
pc = next_instr_address(pc, TRUE);
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}
/*
* Check if this control flow instruction is an
* unconditional transfer.
*/
unconditional = inst_unconditional_flow_transfer(inst);
pc = next_instr_address(pc, FALSE);
/*
* We only set the sequential breakpoint if previous
* instruction was not an unconditional change of flow
* control. If the previous instruction is an
* unconditional change of flow control, setting a
* breakpoint in the next sequential location may set
* a breakpoint in data or in another routine, which
* could screw up in either the program or the debugger.
* (Consider, for instance, that the next sequential
* instruction is the start of a routine needed by the
* debugger.)
*/
if (unconditional == FALSE && db_find_breakpoint_here(pc) == 0)
db_not_taken_bkpt = db_set_temp_breakpoint(pc);
else
db_not_taken_bkpt = 0;
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}
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 */
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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;
}