kernel/ptrace/ptrace-adv.c

74 int ptrace_get_debugreg(struct task_struct *child, unsigned long addr,
80 	return put_user(child->thread.debug.dac1, datalp);
140 static long set_instruction_bp(struct task_struct *child,
144 	int slot1_in_use = ((child->thread.debug.dbcr0 & DBCR0_IAC1) != 0);
145 	int slot2_in_use = ((child->thread.debug.dbcr0 & DBCR0_IAC2) != 0);
146 	int slot3_in_use = ((child->thread.debug.dbcr0 & DBCR0_IAC3) != 0);
147 	int slot4_in_use = ((child->thread.debug.dbcr0 & DBCR0_IAC4) != 0);
149 	if (dbcr_iac_range(child) & DBCR_IAC12MODE)
151 	if (dbcr_iac_range(child) & DBCR_IAC34MODE)
165 			child->thread.debug.iac1 = bp_info->addr;
166 			child->thread.debug.iac2 = bp_info->addr2;
167 			child->thread.debug.dbcr0 |= DBCR0_IAC1;
170 				dbcr_iac_range(child) |= DBCR_IAC12X;
172 				dbcr_iac_range(child) |= DBCR_IAC12I;
176 			child->thread.debug.iac3 = bp_info->addr;
177 			child->thread.debug.iac4 = bp_info->addr2;
178 			child->thread.debug.dbcr0 |= DBCR0_IAC3;
181 				dbcr_iac_range(child) |= DBCR_IAC34X;
183 				dbcr_iac_range(child) |= DBCR_IAC34I;
199 				child->thread.debug.iac1 = bp_info->addr;
200 				child->thread.debug.dbcr0 |= DBCR0_IAC1;
206 			child->thread.debug.iac2 = bp_info->addr;
207 			child->thread.debug.dbcr0 |= DBCR0_IAC2;
211 			child->thread.debug.iac3 = bp_info->addr;
212 			child->thread.debug.dbcr0 |= DBCR0_IAC3;
215 			child->thread.debug.iac4 = bp_info->addr;
216 			child->thread.debug.dbcr0 |= DBCR0_IAC4;
223 	child->thread.debug.dbcr0 |= DBCR0_IDM;
224 	regs_set_return_msr(child->thread.regs, child->thread.regs->msr | MSR_DE);
229 static int del_instruction_bp(struct task_struct *child, int slot)
233 		if ((child->thread.debug.dbcr0 & DBCR0_IAC1) == 0)
236 		if (dbcr_iac_range(child) & DBCR_IAC12MODE) {
238 			child->thread.debug.iac2 = 0;
239 			dbcr_iac_range(child) &= ~DBCR_IAC12MODE;
241 		child->thread.debug.iac1 = 0;
242 		child->thread.debug.dbcr0 &= ~DBCR0_IAC1;
245 		if ((child->thread.debug.dbcr0 & DBCR0_IAC2) == 0)
248 		if (dbcr_iac_range(child) & DBCR_IAC12MODE)
251 		child->thread.debug.iac2 = 0;
252 		child->thread.debug.dbcr0 &= ~DBCR0_IAC2;
256 		if ((child->thread.debug.dbcr0 & DBCR0_IAC3) == 0)
259 		if (dbcr_iac_range(child) & DBCR_IAC34MODE) {
261 			child->thread.debug.iac4 = 0;
262 			dbcr_iac_range(child) &= ~DBCR_IAC34MODE;
264 		child->thread.debug.iac3 = 0;
265 		child->thread.debug.dbcr0 &= ~DBCR0_IAC3;
268 		if ((child->thread.debug.dbcr0 & DBCR0_IAC4) == 0)
271 		if (dbcr_iac_range(child) & DBCR_IAC34MODE)
274 		child->thread.debug.iac4 = 0;
275 		child->thread.debug.dbcr0 &= ~DBCR0_IAC4;
284 static int set_dac(struct task_struct *child, struct ppc_hw_breakpoint *bp_info)
299 	if ((dbcr_dac(child) & (DBCR_DAC1R | DBCR_DAC1W)) == 0) {
302 			dbcr_dac(child) |= DBCR_DAC1R;
304 			dbcr_dac(child) |= DBCR_DAC1W;
305 		child->thread.debug.dac1 = (unsigned long)bp_info->addr;
308 			child->thread.debug.dvc1 =
310 			child->thread.debug.dbcr2 |=
316 	} else if (child->thread.debug.dbcr2 & DBCR2_DAC12MODE) {
320 	} else if ((dbcr_dac(child) & (DBCR_DAC2R | DBCR_DAC2W)) == 0) {
323 			dbcr_dac(child) |= DBCR_DAC2R;
325 			dbcr_dac(child) |= DBCR_DAC2W;
326 		child->thread.debug.dac2 = (unsigned long)bp_info->addr;
329 			child->thread.debug.dvc2 =
331 			child->thread.debug.dbcr2 |=
339 	child->thread.debug.dbcr0 |= DBCR0_IDM;
340 	regs_set_return_msr(child->thread.regs, child->thread.regs->msr | MSR_DE);
345 static int del_dac(struct task_struct *child, int slot)
348 		if ((dbcr_dac(child) & (DBCR_DAC1R | DBCR_DAC1W)) == 0)
351 		child->thread.debug.dac1 = 0;
352 		dbcr_dac(child) &= ~(DBCR_DAC1R | DBCR_DAC1W);
354 		if (child->thread.debug.dbcr2 & DBCR2_DAC12MODE) {
355 			child->thread.debug.dac2 = 0;
356 			child->thread.debug.dbcr2 &= ~DBCR2_DAC12MODE;
358 		child->thread.debug.dbcr2 &= ~(DBCR2_DVC1M | DBCR2_DVC1BE);
361 		child->thread.debug.dvc1 = 0;
364 		if ((dbcr_dac(child) & (DBCR_DAC2R | DBCR_DAC2W)) == 0)
368 		if (child->thread.debug.dbcr2 & DBCR2_DAC12MODE)
371 		child->thread.debug.dbcr2 &= ~(DBCR2_DVC2M | DBCR2_DVC2BE);
374 		child->thread.debug.dvc2 = 0;
376 		child->thread.debug.dac2 = 0;
377 		dbcr_dac(child) &= ~(DBCR_DAC2R | DBCR_DAC2W);
386 static int set_dac_range(struct task_struct *child,
418 	if (child->thread.debug.dbcr0 &
423 		child->thread.debug.dbcr0 |= (DBCR0_DAC1R | DBCR0_IDM);
425 		child->thread.debug.dbcr0 |= (DBCR0_DAC1W | DBCR0_IDM);
426 	child->thread.debug.dac1 = bp_info->addr;
427 	child->thread.debug.dac2 = bp_info->addr2;
429 		child->thread.debug.dbcr2  |= DBCR2_DAC12M;
431 		child->thread.debug.dbcr2  |= DBCR2_DAC12MX;
433 		child->thread.debug.dbcr2  |= DBCR2_DAC12MM;
434 	regs_set_return_msr(child->thread.regs, child->thread.regs->msr | MSR_DE);
440 long ppc_set_hwdebug(struct task_struct *child, struct ppc_hw_breakpoint *bp_info)
464 		return set_instruction_bp(child, bp_info);
467 		return set_dac(child, bp_info);
470 	return set_dac_range(child, bp_info);
476 long ppc_del_hwdebug(struct task_struct *child, long data)
481 		rc = del_instruction_bp(child, (int)data);
483 		rc = del_dac(child, (int)data - 4);
486 		if (!DBCR_ACTIVE_EVENTS(child->thread.debug.dbcr0,
487 					child->thread.debug.dbcr1)) {
488 			child->thread.debug.dbcr0 &= ~DBCR0_IDM;
489 			regs_set_return_msr(child->thread.regs,
490 					child->thread.regs->msr & ~MSR_DE);