Remove some duplicate FreeBSD CVS IDs, move some IDs to better places.
[dragonfly.git] / sys / ddb / db_run.c
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1/*
2 * Mach Operating System
3 * Copyright (c) 1991,1990 Carnegie Mellon University
4 * All Rights Reserved.
5 *
6 * Permission to use, copy, modify and distribute this software and its
7 * documentation is hereby granted, provided that both the copyright
8 * notice and this permission notice appear in all copies of the
9 * software, derivative works or modified versions, and any portions
10 * thereof, and that both notices appear in supporting documentation.
11 *
12 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS
13 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
14 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
15 *
16 * Carnegie Mellon requests users of this software to return to
17 *
18 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
19 * School of Computer Science
20 * Carnegie Mellon University
21 * Pittsburgh PA 15213-3890
22 *
23 * any improvements or extensions that they make and grant Carnegie the
24 * rights to redistribute these changes.
25 *
26 * $FreeBSD: src/sys/ddb/db_run.c,v 1.18 1999/08/28 00:41:10 peter Exp $
6b08710e 27 * $DragonFly: src/sys/ddb/db_run.c,v 1.6 2003/11/15 21:05:40 dillon Exp $
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28 */
29
30/*
31 * Author: David B. Golub, Carnegie Mellon University
32 * Date: 7/90
33 */
34
35/*
36 * Commands to run process.
37 */
38#include <sys/param.h>
39
40#include <vm/vm.h>
41
42#include <ddb/ddb.h>
43#include <ddb/db_break.h>
44#include <ddb/db_access.h>
45
46static int db_run_mode;
47#define STEP_NONE 0
48#define STEP_ONCE 1
49#define STEP_RETURN 2
50#define STEP_CALLT 3
51#define STEP_CONTINUE 4
52#define STEP_INVISIBLE 5
53#define STEP_COUNT 6
54
55static boolean_t db_sstep_print;
56static int db_loop_count;
57static int db_call_depth;
58
59int db_inst_count;
60int db_load_count;
61int db_store_count;
62
63#ifndef db_set_single_step
43c0ece6 64extern void db_set_single_step (db_regs_t *regs);
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65#endif
66#ifndef db_clear_single_step
43c0ece6 67extern void db_clear_single_step (db_regs_t *regs);
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68#endif
69
70#ifdef notused
43c0ece6 71static void db_single_step (db_regs_t *regs);
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72#endif
73
74boolean_t
75db_stop_at_pc(is_breakpoint)
76 boolean_t *is_breakpoint;
77{
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78 db_addr_t pc;
79 db_breakpoint_t bkpt;
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80
81 db_clear_single_step(DDB_REGS);
82 db_clear_breakpoints();
83 db_clear_watchpoints();
84 pc = PC_REGS(DDB_REGS);
85
86#ifdef FIXUP_PC_AFTER_BREAK
87 if (*is_breakpoint) {
88 /*
89 * Breakpoint trap. Fix up the PC if the
90 * machine requires it.
91 */
92 FIXUP_PC_AFTER_BREAK
93 pc = PC_REGS(DDB_REGS);
94 }
95#endif
96
97 /*
98 * Now check for a breakpoint at this address.
99 */
100 bkpt = db_find_breakpoint_here(pc);
101 if (bkpt) {
102 if (--bkpt->count == 0) {
103 bkpt->count = bkpt->init_count;
104 *is_breakpoint = TRUE;
105 return (TRUE); /* stop here */
106 }
107 } else if (*is_breakpoint) {
108#ifdef __i386__ /* XXx */
109 ddb_regs.tf_eip += 1;
110#endif
111 }
112
113 *is_breakpoint = FALSE;
114
115 if (db_run_mode == STEP_INVISIBLE) {
116 db_run_mode = STEP_CONTINUE;
117 return (FALSE); /* continue */
118 }
119 if (db_run_mode == STEP_COUNT) {
120 return (FALSE); /* continue */
121 }
122 if (db_run_mode == STEP_ONCE) {
123 if (--db_loop_count > 0) {
124 if (db_sstep_print) {
125 db_printf("\t\t");
2729d8bd 126 db_print_loc_and_inst(pc, DDB_REGS);
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127 db_printf("\n");
128 }
129 return (FALSE); /* continue */
130 }
131 }
132 if (db_run_mode == STEP_RETURN) {
133 db_expr_t ins = db_get_value(pc, sizeof(int), FALSE);
134
135 /* continue until matching return */
136
137 if (!inst_trap_return(ins) &&
138 (!inst_return(ins) || --db_call_depth != 0)) {
139 if (db_sstep_print) {
140 if (inst_call(ins) || inst_return(ins)) {
ad0290bd 141 int i;
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142
143 db_printf("[after %6d] ", db_inst_count);
144 for (i = db_call_depth; --i > 0; )
145 db_printf(" ");
2729d8bd 146 db_print_loc_and_inst(pc, DDB_REGS);
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147 db_printf("\n");
148 }
149 }
150 if (inst_call(ins))
151 db_call_depth++;
152 return (FALSE); /* continue */
153 }
154 }
155 if (db_run_mode == STEP_CALLT) {
156 db_expr_t ins = db_get_value(pc, sizeof(int), FALSE);
157
158 /* continue until call or return */
159
160 if (!inst_call(ins) &&
161 !inst_return(ins) &&
162 !inst_trap_return(ins)) {
163 return (FALSE); /* continue */
164 }
165 }
166 db_run_mode = STEP_NONE;
167 return (TRUE);
168}
169
170void
171db_restart_at_pc(watchpt)
172 boolean_t watchpt;
173{
ad0290bd 174 db_addr_t pc = PC_REGS(DDB_REGS);
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175
176 if ((db_run_mode == STEP_COUNT) ||
177 (db_run_mode == STEP_RETURN) ||
178 (db_run_mode == STEP_CALLT)) {
179 db_expr_t ins;
180
181 /*
182 * We are about to execute this instruction,
183 * so count it now.
184 */
185
186 ins = db_get_value(pc, sizeof(int), FALSE);
187 db_inst_count++;
188 db_load_count += inst_load(ins);
189 db_store_count += inst_store(ins);
190#ifdef SOFTWARE_SSTEP
191 /* XXX works on mips, but... */
192 if (inst_branch(ins) || inst_call(ins)) {
193 ins = db_get_value(next_instr_address(pc,1),
194 sizeof(int), FALSE);
195 db_inst_count++;
196 db_load_count += inst_load(ins);
197 db_store_count += inst_store(ins);
198 }
6b08710e 199#endif /* SOFTWARE_SSTEP */
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200 }
201
202 if (db_run_mode == STEP_CONTINUE) {
203 if (watchpt || db_find_breakpoint_here(pc)) {
204 /*
205 * Step over breakpoint/watchpoint.
206 */
207 db_run_mode = STEP_INVISIBLE;
208 db_set_single_step(DDB_REGS);
209 } else {
210 db_set_breakpoints();
211 db_set_watchpoints();
212 }
213 } else {
214 db_set_single_step(DDB_REGS);
215 }
216}
217
218#ifdef notused
219static void
220db_single_step(regs)
221 db_regs_t *regs;
222{
223 if (db_run_mode == STEP_CONTINUE) {
224 db_run_mode = STEP_INVISIBLE;
225 db_set_single_step(regs);
226 }
227}
228#endif
229
230#ifdef SOFTWARE_SSTEP
231/*
232 * Software implementation of single-stepping.
233 * If your machine does not have a trace mode
234 * similar to the vax or sun ones you can use
235 * this implementation, done for the mips.
236 * Just define the above conditional and provide
237 * the functions/macros defined below.
238 *
239 * extern boolean_t
240 * inst_branch(), returns true if the instruction might branch
241 * extern unsigned
242 * branch_taken(), return the address the instruction might
243 * branch to
244 * db_getreg_val(); return the value of a user register,
245 * as indicated in the hardware instruction
246 * encoding, e.g. 8 for r8
247 *
248 * next_instr_address(pc,bd) returns the address of the first
249 * instruction following the one at "pc",
250 * which is either in the taken path of
251 * the branch (bd==1) or not. This is
252 * for machines (mips) with branch delays.
253 *
254 * A single-step may involve at most 2 breakpoints -
255 * one for branch-not-taken and one for branch taken.
256 * If one of these addresses does not already have a breakpoint,
257 * we allocate a breakpoint and save it here.
258 * These breakpoints are deleted on return.
259 */
260db_breakpoint_t db_not_taken_bkpt = 0;
261db_breakpoint_t db_taken_bkpt = 0;
262
263void
264db_set_single_step(regs)
ad0290bd 265 db_regs_t *regs;
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266{
267 db_addr_t pc = PC_REGS(regs), brpc;
268 unsigned inst;
269
270 /*
271 * User was stopped at pc, e.g. the instruction
272 * at pc was not executed.
273 */
274 inst = db_get_value(pc, sizeof(int), FALSE);
275 if (inst_branch(inst) || inst_call(inst)) {
276 brpc = branch_taken(inst, pc, regs);
277 if (brpc != pc) { /* self-branches are hopeless */
278 db_taken_bkpt = db_set_temp_breakpoint(brpc);
279 }
280 pc = next_instr_address(pc,1);
281 }
282 pc = next_instr_address(pc,0);
283 db_not_taken_bkpt = db_set_temp_breakpoint(pc);
284}
285
286void
287db_clear_single_step(regs)
288 db_regs_t *regs;
289{
290
291 if (db_not_taken_bkpt != 0) {
292 db_delete_temp_breakpoint(db_not_taken_bkpt);
293 db_not_taken_bkpt = 0;
294 }
295 if (db_taken_bkpt != 0) {
296 db_delete_temp_breakpoint(db_taken_bkpt);
297 db_taken_bkpt = 0;
298 }
299}
300
6b08710e 301#endif /* SOFTWARE_SSTEP */
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302
303extern int db_cmd_loop_done;
304
305/* single-step */
306/*ARGSUSED*/
307void
308db_single_step_cmd(addr, have_addr, count, modif)
309 db_expr_t addr;
310 boolean_t have_addr;
311 db_expr_t count;
312 char * modif;
313{
314 boolean_t print = FALSE;
315
316 if (count == -1)
317 count = 1;
318
319 if (modif[0] == 'p')
320 print = TRUE;
321
322 db_run_mode = STEP_ONCE;
323 db_loop_count = count;
324 db_sstep_print = print;
325 db_inst_count = 0;
326 db_load_count = 0;
327 db_store_count = 0;
328
329 db_cmd_loop_done = 1;
330}
331
332/* trace and print until call/return */
333/*ARGSUSED*/
334void
335db_trace_until_call_cmd(addr, have_addr, count, modif)
336 db_expr_t addr;
337 boolean_t have_addr;
338 db_expr_t count;
339 char * modif;
340{
341 boolean_t print = FALSE;
342
343 if (modif[0] == 'p')
344 print = TRUE;
345
346 db_run_mode = STEP_CALLT;
347 db_sstep_print = print;
348 db_inst_count = 0;
349 db_load_count = 0;
350 db_store_count = 0;
351
352 db_cmd_loop_done = 1;
353}
354
355/*ARGSUSED*/
356void
357db_trace_until_matching_cmd(addr, have_addr, count, modif)
358 db_expr_t addr;
359 boolean_t have_addr;
360 db_expr_t count;
361 char * modif;
362{
363 boolean_t print = FALSE;
364
365 if (modif[0] == 'p')
366 print = TRUE;
367
368 db_run_mode = STEP_RETURN;
369 db_call_depth = 1;
370 db_sstep_print = print;
371 db_inst_count = 0;
372 db_load_count = 0;
373 db_store_count = 0;
374
375 db_cmd_loop_done = 1;
376}
377
378/* continue */
379/*ARGSUSED*/
380void
381db_continue_cmd(addr, have_addr, count, modif)
382 db_expr_t addr;
383 boolean_t have_addr;
384 db_expr_t count;
385 char * modif;
386{
387 if (modif[0] == 'c')
388 db_run_mode = STEP_COUNT;
389 else
390 db_run_mode = STEP_CONTINUE;
391 db_inst_count = 0;
392 db_load_count = 0;
393 db_store_count = 0;
394
395 db_cmd_loop_done = 1;
396}