1 // SPDX-License-Identifier: GPL-2.0
5  * PA-RISC kprobes implementation
22 	if ((unsigned long)p->addr & 3UL)  in arch_prepare_kprobe()
23 		return -EINVAL;  in arch_prepare_kprobe()
25 	p->ainsn.insn = get_insn_slot();  in arch_prepare_kprobe()
26 	if (!p->ainsn.insn)  in arch_prepare_kprobe()
27 		return -ENOMEM;  in arch_prepare_kprobe()
33 	p->opcode = *p->addr;  in arch_prepare_kprobe()
34 	p->ainsn.insn[0] = p->opcode;  in arch_prepare_kprobe()
35 	p->ainsn.insn[1] = PARISC_KPROBES_BREAK_INSN2;  in arch_prepare_kprobe()
43 	if (!p->ainsn.insn)  in arch_remove_kprobe()
46 	free_insn_slot(p->ainsn.insn, 0);  in arch_remove_kprobe()
47 	p->ainsn.insn = NULL;  in arch_remove_kprobe()
52 	patch_text(p->addr, PARISC_KPROBES_BREAK_INSN);  in arch_arm_kprobe()
57 	patch_text(p->addr, p->opcode);  in arch_disarm_kprobe()
62 	kcb->prev_kprobe.kp = kprobe_running();  in save_previous_kprobe()
63 	kcb->prev_kprobe.status = kcb->kprobe_status;  in save_previous_kprobe()
68 	__this_cpu_write(current_kprobe, kcb->prev_kprobe.kp);  in restore_previous_kprobe()
69 	kcb->kprobe_status = kcb->prev_kprobe.status;  in restore_previous_kprobe()
80 	kcb->iaoq[0] = regs->iaoq[0];  in setup_singlestep()
81 	kcb->iaoq[1] = regs->iaoq[1];  in setup_singlestep()
82 	instruction_pointer_set(regs, (unsigned long)p->ainsn.insn);  in setup_singlestep()
93 	p = get_kprobe((unsigned long *)regs->iaoq[0]);  in parisc_kprobe_break_handler()
112 		kcb->kprobe_status = KPROBE_REENTER;  in parisc_kprobe_break_handler()
117 	kcb->kprobe_status = KPROBE_HIT_ACTIVE;  in parisc_kprobe_break_handler()
119 	/* If we have no pre-handler or it returned 0, we continue with  in parisc_kprobe_break_handler()
120 	 * normal processing. If we have a pre-handler and it returned  in parisc_kprobe_break_handler()
121 	 * non-zero - which means user handler setup registers to exit  in parisc_kprobe_break_handler()
125 	if (!p->pre_handler || !p->pre_handler(p, regs)) {  in parisc_kprobe_break_handler()
127 		kcb->kprobe_status = KPROBE_HIT_SS;  in parisc_kprobe_break_handler()
143 	if (regs->iaoq[0] != (unsigned long)p->ainsn.insn+4)  in parisc_kprobe_ss_handler()
147 	if (kcb->kprobe_status == KPROBE_REENTER) {  in parisc_kprobe_ss_handler()
158 	if (p->post_handler)  in parisc_kprobe_ss_handler()
159 		p->post_handler(p, regs, 0);  in parisc_kprobe_ss_handler()
161 	switch (regs->iir >> 26) {  in parisc_kprobe_ss_handler()
166 		/* for absolute branches, regs->iaoq[1] has already the right  in parisc_kprobe_ss_handler()
169 		regs->iaoq[0] = kcb->iaoq[1];  in parisc_kprobe_ss_handler()
172 		regs->iaoq[0] = kcb->iaoq[1];  in parisc_kprobe_ss_handler()
173 		regs->iaoq[1] = regs->iaoq[0] + 4;  in parisc_kprobe_ss_handler()
176 	kcb->kprobe_status = KPROBE_HIT_SSDONE;  in parisc_kprobe_ss_handler()
205 	regs->gr[2] = (unsigned long)correct_ret_addr;  in arch_kretprobe_fixup_return()
211 	ri->ret_addr = (kprobe_opcode_t *)regs->gr[2];  in arch_prepare_kretprobe()
212 	ri->fp = NULL;  in arch_prepare_kretprobe()
215 	regs->gr[2] = (unsigned long)trampoline_p.addr;  in arch_prepare_kretprobe()
220 	return p->addr == trampoline_p.addr;  in arch_trampoline_kprobe()