1 // SPDX-License-Identifier: GPL-2.0-only
3  * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
18 		(unsigned long)current_thread_info() + THREAD_SIZE - (addr))
26 	if ((unsigned long)p->addr & 0x01)  in arch_prepare_kprobe()
27 		return -EINVAL;  in arch_prepare_kprobe()
31 	p->ainsn.is_short = is_short_instr((unsigned long)p->addr);  in arch_prepare_kprobe()
32 	p->opcode = *p->addr;  in arch_prepare_kprobe()
39 	*p->addr = UNIMP_S_INSTRUCTION;  in arch_arm_kprobe()
41 	flush_icache_range((unsigned long)p->addr,  in arch_arm_kprobe()
42 			   (unsigned long)p->addr + sizeof(kprobe_opcode_t));  in arch_arm_kprobe()
47 	*p->addr = p->opcode;  in arch_disarm_kprobe()
49 	flush_icache_range((unsigned long)p->addr,  in arch_disarm_kprobe()
50 			   (unsigned long)p->addr + sizeof(kprobe_opcode_t));  in arch_disarm_kprobe()
58 	if (p->ainsn.t1_addr) {  in arch_remove_kprobe()
59 		*(p->ainsn.t1_addr) = p->ainsn.t1_opcode;  in arch_remove_kprobe()
61 		flush_icache_range((unsigned long)p->ainsn.t1_addr,  in arch_remove_kprobe()
62 				   (unsigned long)p->ainsn.t1_addr +  in arch_remove_kprobe()
65 		p->ainsn.t1_addr = NULL;  in arch_remove_kprobe()
68 	if (p->ainsn.t2_addr) {  in arch_remove_kprobe()
69 		*(p->ainsn.t2_addr) = p->ainsn.t2_opcode;  in arch_remove_kprobe()
71 		flush_icache_range((unsigned long)p->ainsn.t2_addr,  in arch_remove_kprobe()
72 				   (unsigned long)p->ainsn.t2_addr +  in arch_remove_kprobe()
75 		p->ainsn.t2_addr = NULL;  in arch_remove_kprobe()
81 	kcb->prev_kprobe.kp = kprobe_running();  in save_previous_kprobe()
82 	kcb->prev_kprobe.status = kcb->kprobe_status;  in save_previous_kprobe()
87 	__this_cpu_write(current_kprobe, kcb->prev_kprobe.kp);  in restore_previous_kprobe()
88 	kcb->kprobe_status = kcb->prev_kprobe.status;  in restore_previous_kprobe()
102 	if (p->ainsn.t1_addr) {  in resume_execution()
103 		*(p->ainsn.t1_addr) = p->ainsn.t1_opcode;  in resume_execution()
105 		flush_icache_range((unsigned long)p->ainsn.t1_addr,  in resume_execution()
106 				   (unsigned long)p->ainsn.t1_addr +  in resume_execution()
109 		p->ainsn.t1_addr = NULL;  in resume_execution()
112 	if (p->ainsn.t2_addr) {  in resume_execution()
113 		*(p->ainsn.t2_addr) = p->ainsn.t2_opcode;  in resume_execution()
115 		flush_icache_range((unsigned long)p->ainsn.t2_addr,  in resume_execution()
116 				   (unsigned long)p->ainsn.t2_addr +  in resume_execution()
119 		p->ainsn.t2_addr = NULL;  in resume_execution()
136 	*(p->addr) = p->opcode;  in setup_singlestep()
138 	flush_icache_range((unsigned long)p->addr,  in setup_singlestep()
139 			   (unsigned long)p->addr + sizeof(kprobe_opcode_t));  in setup_singlestep()
146 	bta = regs->bta;  in setup_singlestep()
148 	if (regs->status32 & 0x40) {  in setup_singlestep()
153 		if (!p->ainsn.is_short) {  in setup_singlestep()
155 				regs->blink += 2;  in setup_singlestep()
163 				regs->bta += 2;  in setup_singlestep()
170 		    disasm_next_pc((unsigned long)p->addr, regs,  in setup_singlestep()
171 			(struct callee_regs *) current->thread.callee_reg,  in setup_singlestep()
174 	p->ainsn.t1_addr = (kprobe_opcode_t *) next_pc;  in setup_singlestep()
175 	p->ainsn.t1_opcode = *(p->ainsn.t1_addr);  in setup_singlestep()
176 	*(p->ainsn.t1_addr) = TRAP_S_2_INSTRUCTION;  in setup_singlestep()
178 	flush_icache_range((unsigned long)p->ainsn.t1_addr,  in setup_singlestep()
179 			   (unsigned long)p->ainsn.t1_addr +  in setup_singlestep()
183 		p->ainsn.t2_addr = (kprobe_opcode_t *) tgt_if_br;  in setup_singlestep()
184 		p->ainsn.t2_opcode = *(p->ainsn.t2_addr);  in setup_singlestep()
185 		*(p->ainsn.t2_addr) = TRAP_S_2_INSTRUCTION;  in setup_singlestep()
187 		flush_icache_range((unsigned long)p->ainsn.t2_addr,  in setup_singlestep()
188 				   (unsigned long)p->ainsn.t2_addr +  in setup_singlestep()
217 			kcb->kprobe_status = KPROBE_REENTER;  in arc_kprobe_handler()
222 		kcb->kprobe_status = KPROBE_HIT_ACTIVE;  in arc_kprobe_handler()
224 		/* If we have no pre-handler or it returned 0, we continue with  in arc_kprobe_handler()
225 		 * normal processing. If we have a pre-handler and it returned  in arc_kprobe_handler()
226 		 * non-zero - which means user handler setup registers to exit  in arc_kprobe_handler()
229 		if (!p->pre_handler || !p->pre_handler(p, regs)) {  in arc_kprobe_handler()
231 			kcb->kprobe_status = KPROBE_HIT_SS;  in arc_kprobe_handler()
264 	regs->ret = addr;  in arc_post_kprobe_handler()
266 	if ((kcb->kprobe_status != KPROBE_REENTER) && cur->post_handler) {  in arc_post_kprobe_handler()
267 		kcb->kprobe_status = KPROBE_HIT_SSDONE;  in arc_post_kprobe_handler()
268 		cur->post_handler(cur, regs, 0);  in arc_post_kprobe_handler()
271 	if (kcb->kprobe_status == KPROBE_REENTER) {  in arc_post_kprobe_handler()
285  * pre/post handlers in the module.
295 	switch (kcb->kprobe_status) {  in kprobe_fault_handler()
304 		resume_execution(cur, (unsigned long)cur->addr, regs);  in kprobe_fault_handler()
306 		if (kcb->kprobe_status == KPROBE_REENTER)  in kprobe_fault_handler()
317 		 * We are here because the instructions in the pre/post handler  in kprobe_fault_handler()
322 		 * In case the user-specified fault handler returned zero,  in kprobe_fault_handler()
344 	unsigned long addr = args->err;  in kprobe_exceptions_notify()
349 		if (arc_kprobe_handler(addr, args->regs))  in kprobe_exceptions_notify()
354 		if (arc_post_kprobe_handler(addr, args->regs))  in kprobe_exceptions_notify()
376 	ri->ret_addr = (kprobe_opcode_t *) regs->blink;  in arch_prepare_kretprobe()
377 	ri->fp = NULL;  in arch_prepare_kretprobe()
380 	regs->blink = (unsigned long)&__kretprobe_trampoline;  in arch_prepare_kretprobe()
386 	regs->ret = __kretprobe_trampoline_handler(regs, NULL);  in trampoline_probe_handler()
407 	if (p->addr == (kprobe_opcode_t *) &__kretprobe_trampoline)  in arch_trampoline_kprobe()