1 // SPDX-License-Identifier: GPL-2.0-only
15 	p->ainsn.insn[0] = *p->addr;  in arch_prepare_ss_slot()
16 	p->ainsn.insn[1] = KPROBE_SSTEPBP_INSN;  in arch_prepare_ss_slot()
17 	p->ainsn.restore = (unsigned long)p->addr + LOONGARCH_INSN_SIZE;  in arch_prepare_ss_slot()
23 	p->ainsn.restore = 0;  in arch_prepare_simulate()
31 	if ((unsigned long)p->addr & 0x3)  in arch_prepare_kprobe()
32 		return -EILSEQ;  in arch_prepare_kprobe()
35 	p->opcode = *p->addr;  in arch_prepare_kprobe()
36 	insn.word = p->opcode;  in arch_prepare_kprobe()
40 		return -EINVAL;  in arch_prepare_kprobe()
43 		p->ainsn.insn = NULL;  in arch_prepare_kprobe()
45 		p->ainsn.insn = get_insn_slot();  in arch_prepare_kprobe()
46 		if (!p->ainsn.insn)  in arch_prepare_kprobe()
47 			return -ENOMEM;  in arch_prepare_kprobe()
51 	if (p->ainsn.insn)  in arch_prepare_kprobe()
63 	*p->addr = KPROBE_BP_INSN;  in arch_arm_kprobe()
71 	*p->addr = p->opcode;  in arch_disarm_kprobe()
78 	if (p->ainsn.insn) {  in arch_remove_kprobe()
79 		free_insn_slot(p->ainsn.insn, 0);  in arch_remove_kprobe()
80 		p->ainsn.insn = NULL;  in arch_remove_kprobe()
87 	kcb->prev_kprobe.kp = kprobe_running();  in save_previous_kprobe()
88 	kcb->prev_kprobe.status = kcb->kprobe_status;  in save_previous_kprobe()
94 	__this_cpu_write(current_kprobe, kcb->prev_kprobe.kp);  in restore_previous_kprobe()
95 	kcb->kprobe_status = kcb->prev_kprobe.status;  in restore_previous_kprobe()
106  * Interrupts need to be disabled before single-step mode is set,
107  * and not reenabled until after single-step mode ends.
110  * of out-of-line single-step, that result in wrongly single stepping
116 	kcb->saved_status = regs->csr_prmd;  in save_local_irqflag()
117 	regs->csr_prmd &= ~CSR_PRMD_PIE;  in save_local_irqflag()
124 	regs->csr_prmd = kcb->saved_status;  in restore_local_irqflag()
131 	/* return addr restore if non-branching insn */  in post_kprobe_handler()
132 	if (cur->ainsn.restore != 0)  in post_kprobe_handler()
133 		instruction_pointer_set(regs, cur->ainsn.restore);  in post_kprobe_handler()
136 	if (kcb->kprobe_status == KPROBE_REENTER) {  in post_kprobe_handler()
143 	 * update the kcb status even if the cur->post_handler is  in post_kprobe_handler()
146 	kcb->kprobe_status = KPROBE_HIT_SSDONE;  in post_kprobe_handler()
147 	if (cur->post_handler)  in post_kprobe_handler()
148 		cur->post_handler(cur, regs, 0);  in post_kprobe_handler()
163 		kcb->kprobe_status = KPROBE_REENTER;  in setup_singlestep()
165 		kcb->kprobe_status = KPROBE_HIT_SS;  in setup_singlestep()
168 	if (p->ainsn.insn) {  in setup_singlestep()
172 		regs->csr_era = (unsigned long)p->ainsn.insn;  in setup_singlestep()
175 		insn.word = p->opcode;  in setup_singlestep()
177 		/* now go for post processing */  in setup_singlestep()
186 	switch (kcb->kprobe_status) {  in reenter_kprobe()
211 	kprobe_opcode_t *addr = (kprobe_opcode_t *)regs->csr_era;  in kprobe_breakpoint_handler()
215 	 * duration of kprobe processing.  in kprobe_breakpoint_handler()
229 			kcb->kprobe_status = KPROBE_HIT_ACTIVE;  in kprobe_breakpoint_handler()
232 			 * If we have no pre-handler or it returned 0, we  in kprobe_breakpoint_handler()
233 			 * continue with normal processing.  If we have a  in kprobe_breakpoint_handler()
234 			 * pre-handler and it returned non-zero, it will  in kprobe_breakpoint_handler()
241 			if (!p->pre_handler || !p->pre_handler(p, regs)) {  in kprobe_breakpoint_handler()
260 		regs->csr_era = (unsigned long)addr;  in kprobe_breakpoint_handler()
276 	if (cur && (kcb->kprobe_status & (KPROBE_HIT_SS | KPROBE_REENTER)) &&  in kprobe_singlestep_handler()
277 	    ((unsigned long)&cur->ainsn.insn[1] == addr)) {  in kprobe_singlestep_handler()
293 	switch (kcb->kprobe_status) {  in kprobe_fault_handler()
303 		regs->csr_era = (unsigned long)cur->addr;  in kprobe_fault_handler()
306 		if (kcb->kprobe_status == KPROBE_REENTER) {  in kprobe_fault_handler()