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