1 files changed, 452 insertions, 0 deletions

diff --git a/arch/sh/kernel/kprobes.c b/arch/sh/kernel/kprobes.c
new file mode 100644
index 000000000..aed1ea8e2
--- /dev/null
+++ b/arch/sh/kernel/kprobes.c
@@ -0,0 +1,452 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Kernel probes (kprobes) for SuperH
+ *
+ * Copyright (C) 2007 Chris Smith <chris.smith@st.com>
+ * Copyright (C) 2006 Lineo Solutions, Inc.
+ */
+#include <linux/kprobes.h>
+#include <linux/extable.h>
+#include <linux/ptrace.h>
+#include <linux/preempt.h>
+#include <linux/kdebug.h>
+#include <linux/slab.h>
+#include <asm/cacheflush.h>
+#include <linux/uaccess.h>
+
+DEFINE_PER_CPU(struct kprobe *, current_kprobe) = NULL;
+DEFINE_PER_CPU(struct kprobe_ctlblk, kprobe_ctlblk);
+
+static DEFINE_PER_CPU(struct kprobe, saved_current_opcode);
+static DEFINE_PER_CPU(struct kprobe, saved_next_opcode);
+static DEFINE_PER_CPU(struct kprobe, saved_next_opcode2);
+
+#define OPCODE_JMP(x)	(((x) & 0xF0FF) == 0x402b)
+#define OPCODE_JSR(x)	(((x) & 0xF0FF) == 0x400b)
+#define OPCODE_BRA(x)	(((x) & 0xF000) == 0xa000)
+#define OPCODE_BRAF(x)	(((x) & 0xF0FF) == 0x0023)
+#define OPCODE_BSR(x)	(((x) & 0xF000) == 0xb000)
+#define OPCODE_BSRF(x)	(((x) & 0xF0FF) == 0x0003)
+
+#define OPCODE_BF_S(x)	(((x) & 0xFF00) == 0x8f00)
+#define OPCODE_BT_S(x)	(((x) & 0xFF00) == 0x8d00)
+
+#define OPCODE_BF(x)	(((x) & 0xFF00) == 0x8b00)
+#define OPCODE_BT(x)	(((x) & 0xFF00) == 0x8900)
+
+#define OPCODE_RTS(x)	(((x) & 0x000F) == 0x000b)
+#define OPCODE_RTE(x)	(((x) & 0xFFFF) == 0x002b)
+
+int __kprobes arch_prepare_kprobe(struct kprobe *p)
+{
+	kprobe_opcode_t opcode = *(kprobe_opcode_t *) (p->addr);
+
+	if (OPCODE_RTE(opcode))
+		return -EFAULT;	/* Bad breakpoint */
+
+	p->opcode = opcode;
+
+	return 0;
+}
+
+void __kprobes arch_copy_kprobe(struct kprobe *p)
+{
+	memcpy(p->ainsn.insn, p->addr, MAX_INSN_SIZE * sizeof(kprobe_opcode_t));
+	p->opcode = *p->addr;
+}
+
+void __kprobes arch_arm_kprobe(struct kprobe *p)
+{
+	*p->addr = BREAKPOINT_INSTRUCTION;
+	flush_icache_range((unsigned long)p->addr,
+			   (unsigned long)p->addr + sizeof(kprobe_opcode_t));
+}
+
+void __kprobes arch_disarm_kprobe(struct kprobe *p)
+{
+	*p->addr = p->opcode;
+	flush_icache_range((unsigned long)p->addr,
+			   (unsigned long)p->addr + sizeof(kprobe_opcode_t));
+}
+
+int __kprobes arch_trampoline_kprobe(struct kprobe *p)
+{
+	if (*p->addr == BREAKPOINT_INSTRUCTION)
+		return 1;
+
+	return 0;
+}
+
+/**
+ * If an illegal slot instruction exception occurs for an address
+ * containing a kprobe, remove the probe.
+ *
+ * Returns 0 if the exception was handled successfully, 1 otherwise.
+ */
+int __kprobes kprobe_handle_illslot(unsigned long pc)
+{
+	struct kprobe *p = get_kprobe((kprobe_opcode_t *) pc + 1);
+
+	if (p != NULL) {
+		printk("Warning: removing kprobe from delay slot: 0x%.8x\n",
+		       (unsigned int)pc + 2);
+		unregister_kprobe(p);
+		return 0;
+	}
+
+	return 1;
+}
+
+void __kprobes arch_remove_kprobe(struct kprobe *p)
+{
+	struct kprobe *saved = this_cpu_ptr(&saved_next_opcode);
+
+	if (saved->addr) {
+		arch_disarm_kprobe(p);
+		arch_disarm_kprobe(saved);
+
+		saved->addr = NULL;
+		saved->opcode = 0;
+
+		saved = this_cpu_ptr(&saved_next_opcode2);
+		if (saved->addr) {
+			arch_disarm_kprobe(saved);
+
+			saved->addr = NULL;
+			saved->opcode = 0;
+		}
+	}
+}
+
+static void __kprobes save_previous_kprobe(struct kprobe_ctlblk *kcb)
+{
+	kcb->prev_kprobe.kp = kprobe_running();
+	kcb->prev_kprobe.status = kcb->kprobe_status;
+}
+
+static void __kprobes restore_previous_kprobe(struct kprobe_ctlblk *kcb)
+{
+	__this_cpu_write(current_kprobe, kcb->prev_kprobe.kp);
+	kcb->kprobe_status = kcb->prev_kprobe.status;
+}
+
+static void __kprobes set_current_kprobe(struct kprobe *p, struct pt_regs *regs,
+					 struct kprobe_ctlblk *kcb)
+{
+	__this_cpu_write(current_kprobe, p);
+}
+
+/*
+ * Singlestep is implemented by disabling the current kprobe and setting one
+ * on the next instruction, following branches. Two probes are set if the
+ * branch is conditional.
+ */
+static void __kprobes prepare_singlestep(struct kprobe *p, struct pt_regs *regs)
+{
+	__this_cpu_write(saved_current_opcode.addr, (kprobe_opcode_t *)regs->pc);
+
+	if (p != NULL) {
+		struct kprobe *op1, *op2;
+
+		arch_disarm_kprobe(p);
+
+		op1 = this_cpu_ptr(&saved_next_opcode);
+		op2 = this_cpu_ptr(&saved_next_opcode2);
+
+		if (OPCODE_JSR(p->opcode) || OPCODE_JMP(p->opcode)) {
+			unsigned int reg_nr = ((p->opcode >> 8) & 0x000F);
+			op1->addr = (kprobe_opcode_t *) regs->regs[reg_nr];
+		} else if (OPCODE_BRA(p->opcode) || OPCODE_BSR(p->opcode)) {
+			unsigned long disp = (p->opcode & 0x0FFF);
+			op1->addr =
+			    (kprobe_opcode_t *) (regs->pc + 4 + disp * 2);
+
+		} else if (OPCODE_BRAF(p->opcode) || OPCODE_BSRF(p->opcode)) {
+			unsigned int reg_nr = ((p->opcode >> 8) & 0x000F);
+			op1->addr =
+			    (kprobe_opcode_t *) (regs->pc + 4 +
+						 regs->regs[reg_nr]);
+
+		} else if (OPCODE_RTS(p->opcode)) {
+			op1->addr = (kprobe_opcode_t *) regs->pr;
+
+		} else if (OPCODE_BF(p->opcode) || OPCODE_BT(p->opcode)) {
+			unsigned long disp = (p->opcode & 0x00FF);
+			/* case 1 */
+			op1->addr = p->addr + 1;
+			/* case 2 */
+			op2->addr =
+			    (kprobe_opcode_t *) (regs->pc + 4 + disp * 2);
+			op2->opcode = *(op2->addr);
+			arch_arm_kprobe(op2);
+
+		} else if (OPCODE_BF_S(p->opcode) || OPCODE_BT_S(p->opcode)) {
+			unsigned long disp = (p->opcode & 0x00FF);
+			/* case 1 */
+			op1->addr = p->addr + 2;
+			/* case 2 */
+			op2->addr =
+			    (kprobe_opcode_t *) (regs->pc + 4 + disp * 2);
+			op2->opcode = *(op2->addr);
+			arch_arm_kprobe(op2);
+
+		} else {
+			op1->addr = p->addr + 1;
+		}
+
+		op1->opcode = *(op1->addr);
+		arch_arm_kprobe(op1);
+	}
+}
+
+/* Called with kretprobe_lock held */
+void __kprobes arch_prepare_kretprobe(struct kretprobe_instance *ri,
+				      struct pt_regs *regs)
+{
+	ri->ret_addr = (kprobe_opcode_t *) regs->pr;
+	ri->fp = NULL;
+
+	/* Replace the return addr with trampoline addr */
+	regs->pr = (unsigned long)__kretprobe_trampoline;
+}
+
+static int __kprobes kprobe_handler(struct pt_regs *regs)
+{
+	struct kprobe *p;
+	int ret = 0;
+	kprobe_opcode_t *addr = NULL;
+	struct kprobe_ctlblk *kcb;
+
+	/*
+	 * We don't want to be preempted for the entire
+	 * duration of kprobe processing
+	 */
+	preempt_disable();
+	kcb = get_kprobe_ctlblk();
+
+	addr = (kprobe_opcode_t *) (regs->pc);
+
+	/* Check we're not actually recursing */
+	if (kprobe_running()) {
+		p = get_kprobe(addr);
+		if (p) {
+			if (kcb->kprobe_status == KPROBE_HIT_SS &&
+			    *p->ainsn.insn == BREAKPOINT_INSTRUCTION) {
+				goto no_kprobe;
+			}
+			/* We have reentered the kprobe_handler(), since
+			 * another probe was hit while within the handler.
+			 * We here save the original kprobes variables and
+			 * just single step on the instruction of the new probe
+			 * without calling any user handlers.
+			 */
+			save_previous_kprobe(kcb);
+			set_current_kprobe(p, regs, kcb);
+			kprobes_inc_nmissed_count(p);
+			prepare_singlestep(p, regs);
+			kcb->kprobe_status = KPROBE_REENTER;
+			return 1;
+		}
+		goto no_kprobe;
+	}
+
+	p = get_kprobe(addr);
+	if (!p) {
+		/* Not one of ours: let kernel handle it */
+		if (*(kprobe_opcode_t *)addr != BREAKPOINT_INSTRUCTION) {
+			/*
+			 * The breakpoint instruction was removed right
+			 * after we hit it. Another cpu has removed
+			 * either a probepoint or a debugger breakpoint
+			 * at this address. In either case, no further
+			 * handling of this interrupt is appropriate.
+			 */
+			ret = 1;
+		}
+
+		goto no_kprobe;
+	}
+
+	set_current_kprobe(p, regs, kcb);
+	kcb->kprobe_status = KPROBE_HIT_ACTIVE;
+
+	if (p->pre_handler && p->pre_handler(p, regs)) {
+		/* handler has already set things up, so skip ss setup */
+		reset_current_kprobe();
+		preempt_enable_no_resched();
+		return 1;
+	}
+
+	prepare_singlestep(p, regs);
+	kcb->kprobe_status = KPROBE_HIT_SS;
+	return 1;
+
+no_kprobe:
+	preempt_enable_no_resched();
+	return ret;
+}
+
+/*
+ * For function-return probes, init_kprobes() establishes a probepoint
+ * here. When a retprobed function returns, this probe is hit and
+ * trampoline_probe_handler() runs, calling the kretprobe's handler.
+ */
+static void __used kretprobe_trampoline_holder(void)
+{
+	asm volatile (".globl __kretprobe_trampoline\n"
+		      "__kretprobe_trampoline:\n\t"
+		      "nop\n");
+}
+
+/*
+ * Called when we hit the probe point at __kretprobe_trampoline
+ */
+int __kprobes trampoline_probe_handler(struct kprobe *p, struct pt_regs *regs)
+{
+	regs->pc = __kretprobe_trampoline_handler(regs, NULL);
+
+	return 1;
+}
+
+static int __kprobes post_kprobe_handler(struct pt_regs *regs)
+{
+	struct kprobe *cur = kprobe_running();
+	struct kprobe_ctlblk *kcb = get_kprobe_ctlblk();
+	kprobe_opcode_t *addr = NULL;
+	struct kprobe *p = NULL;
+
+	if (!cur)
+		return 0;
+
+	if ((kcb->kprobe_status != KPROBE_REENTER) && cur->post_handler) {
+		kcb->kprobe_status = KPROBE_HIT_SSDONE;
+		cur->post_handler(cur, regs, 0);
+	}
+
+	p = this_cpu_ptr(&saved_next_opcode);
+	if (p->addr) {
+		arch_disarm_kprobe(p);
+		p->addr = NULL;
+		p->opcode = 0;
+
+		addr = __this_cpu_read(saved_current_opcode.addr);
+		__this_cpu_write(saved_current_opcode.addr, NULL);
+
+		p = get_kprobe(addr);
+		arch_arm_kprobe(p);
+
+		p = this_cpu_ptr(&saved_next_opcode2);
+		if (p->addr) {
+			arch_disarm_kprobe(p);
+			p->addr = NULL;
+			p->opcode = 0;
+		}
+	}
+
+	/* Restore back the original saved kprobes variables and continue. */
+	if (kcb->kprobe_status == KPROBE_REENTER) {
+		restore_previous_kprobe(kcb);
+		goto out;
+	}
+
+	reset_current_kprobe();
+
+out:
+	preempt_enable_no_resched();
+
+	return 1;
+}
+
+int __kprobes kprobe_fault_handler(struct pt_regs *regs, int trapnr)
+{
+	struct kprobe *cur = kprobe_running();
+	struct kprobe_ctlblk *kcb = get_kprobe_ctlblk();
+	const struct exception_table_entry *entry;
+
+	switch (kcb->kprobe_status) {
+	case KPROBE_HIT_SS:
+	case KPROBE_REENTER:
+		/*
+		 * We are here because the instruction being single
+		 * stepped caused a page fault. We reset the current
+		 * kprobe, point the pc back to the probe address
+		 * and allow the page fault handler to continue as a
+		 * normal page fault.
+		 */
+		regs->pc = (unsigned long)cur->addr;
+		if (kcb->kprobe_status == KPROBE_REENTER)
+			restore_previous_kprobe(kcb);
+		else
+			reset_current_kprobe();
+		preempt_enable_no_resched();
+		break;
+	case KPROBE_HIT_ACTIVE:
+	case KPROBE_HIT_SSDONE:
+		/*
+		 * In case the user-specified fault handler returned
+		 * zero, try to fix up.
+		 */
+		if ((entry = search_exception_tables(regs->pc)) != NULL) {
+			regs->pc = entry->fixup;
+			return 1;
+		}
+
+		/*
+		 * fixup_exception() could not handle it,
+		 * Let do_page_fault() fix it.
+		 */
+		break;
+	default:
+		break;
+	}
+
+	return 0;
+}
+
+/*
+ * Wrapper routine to for handling exceptions.
+ */
+int __kprobes kprobe_exceptions_notify(struct notifier_block *self,
+				       unsigned long val, void *data)
+{
+	struct kprobe *p = NULL;
+	struct die_args *args = (struct die_args *)data;
+	int ret = NOTIFY_DONE;
+	kprobe_opcode_t *addr = NULL;
+	struct kprobe_ctlblk *kcb = get_kprobe_ctlblk();
+
+	addr = (kprobe_opcode_t *) (args->regs->pc);
+	if (val == DIE_TRAP &&
+	    args->trapnr == (BREAKPOINT_INSTRUCTION & 0xff)) {
+		if (!kprobe_running()) {
+			if (kprobe_handler(args->regs)) {
+				ret = NOTIFY_STOP;
+			} else {
+				/* Not a kprobe trap */
+				ret = NOTIFY_DONE;
+			}
+		} else {
+			p = get_kprobe(addr);
+			if ((kcb->kprobe_status == KPROBE_HIT_SS) ||
+			    (kcb->kprobe_status == KPROBE_REENTER)) {
+				if (post_kprobe_handler(args->regs))
+					ret = NOTIFY_STOP;
+			} else {
+				if (kprobe_handler(args->regs))
+					ret = NOTIFY_STOP;
+			}
+		}
+	}
+
+	return ret;
+}
+
+static struct kprobe trampoline_p = {
+	.addr = (kprobe_opcode_t *)&__kretprobe_trampoline,
+	.pre_handler = trampoline_probe_handler
+};
+
+int __init arch_init_kprobes(void)
+{
+	return register_kprobe(&trampoline_p);
+}