5 files changed, 43 insertions, 39 deletions
diff --git a/arch/s390/kernel/Makefile b/arch/s390/kernel/Makefile
index 5e6a23299790..6065fabb781a 100644
--- a/arch/s390/kernel/Makefile
+++ b/arch/s390/kernel/Makefile
@@ -58,6 +58,7 @@ obj-$(CONFIG_EARLY_PRINTK)	+= early_printk.o
 obj-$(CONFIG_KPROBES)		+= kprobes.o
 obj-$(CONFIG_KPROBES)		+= kprobes_insn_page.o
 obj-$(CONFIG_KPROBES)		+= mcount.o
+obj-$(CONFIG_RETHOOK)		+= rethook.o
 obj-$(CONFIG_FUNCTION_TRACER)	+= ftrace.o
 obj-$(CONFIG_FUNCTION_TRACER)	+= mcount.o
 obj-$(CONFIG_CRASH_DUMP)	+= crash_dump.o
diff --git a/arch/s390/kernel/kprobes.c b/arch/s390/kernel/kprobes.c
index 401f9c933ff9..5e713f318de3 100644
--- a/arch/s390/kernel/kprobes.c
+++ b/arch/s390/kernel/kprobes.c
@@ -281,16 +281,6 @@ static void pop_kprobe(struct kprobe_ctlblk *kcb)
 }
 NOKPROBE_SYMBOL(pop_kprobe);
 
-void arch_prepare_kretprobe(struct kretprobe_instance *ri, struct pt_regs *regs)
-{
-	ri->ret_addr = (kprobe_opcode_t *)regs->gprs[14];
-	ri->fp = (void *)regs->gprs[15];
-
-	/* Replace the return addr with trampoline addr */
-	regs->gprs[14] = (unsigned long)&__kretprobe_trampoline;
-}
-NOKPROBE_SYMBOL(arch_prepare_kretprobe);
-
 static void kprobe_reenter_check(struct kprobe_ctlblk *kcb, struct kprobe *p)
 {
 	switch (kcb->kprobe_status) {
@@ -371,26 +361,6 @@ static int kprobe_handler(struct pt_regs *regs)
 }
 NOKPROBE_SYMBOL(kprobe_handler);
 
-void arch_kretprobe_fixup_return(struct pt_regs *regs,
-				 kprobe_opcode_t *correct_ret_addr)
-{
-	/* Replace fake return address with real one. */
-	regs->gprs[14] = (unsigned long)correct_ret_addr;
-}
-NOKPROBE_SYMBOL(arch_kretprobe_fixup_return);
-
-/*
- * Called from __kretprobe_trampoline
- */
-void trampoline_probe_handler(struct pt_regs *regs)
-{
-	kretprobe_trampoline_handler(regs, (void *)regs->gprs[15]);
-}
-NOKPROBE_SYMBOL(trampoline_probe_handler);
-
-/* assembler function that handles the kretprobes must not be probed itself */
-NOKPROBE_SYMBOL(__kretprobe_trampoline);
-
 /*
  * Called after single-stepping.  p->addr is the address of the
  * instruction whose first byte has been replaced by the "breakpoint"
diff --git a/arch/s390/kernel/mcount.S b/arch/s390/kernel/mcount.S
index 4786bfe02144..43ff91073d2a 100644
--- a/arch/s390/kernel/mcount.S
+++ b/arch/s390/kernel/mcount.S
@@ -135,9 +135,9 @@ SYM_FUNC_END(return_to_handler)
 #endif
 #endif /* CONFIG_FUNCTION_TRACER */
 
-#ifdef CONFIG_KPROBES
+#ifdef CONFIG_RETHOOK
 
-SYM_FUNC_START(__kretprobe_trampoline)
+SYM_FUNC_START(arch_rethook_trampoline)
 
 	stg	%r14,(__SF_GPRS+8*8)(%r15)
 	lay	%r15,-STACK_FRAME_SIZE(%r15)
@@ -152,16 +152,16 @@ SYM_FUNC_START(__kretprobe_trampoline)
 	epsw	%r2,%r3
 	risbg	%r3,%r2,0,31,32
 	stg	%r3,STACK_PTREGS_PSW(%r15)
-	larl	%r1,__kretprobe_trampoline
+	larl	%r1,arch_rethook_trampoline
 	stg	%r1,STACK_PTREGS_PSW+8(%r15)
 
 	lay	%r2,STACK_PTREGS(%r15)
-	brasl	%r14,trampoline_probe_handler
+	brasl	%r14,arch_rethook_trampoline_callback
 
 	mvc	__SF_EMPTY(16,%r7),STACK_PTREGS_PSW(%r15)
 	lmg	%r0,%r15,STACK_PTREGS_GPRS(%r15)
 	lpswe	__SF_EMPTY(%r15)
 
-SYM_FUNC_END(__kretprobe_trampoline)
+SYM_FUNC_END(arch_rethook_trampoline)
 
-#endif /* CONFIG_KPROBES */
+#endif /* CONFIG_RETHOOK */
diff --git a/arch/s390/kernel/rethook.c b/arch/s390/kernel/rethook.c
new file mode 100644
index 000000000000..f2b6237bc35d
--- /dev/null
+++ b/arch/s390/kernel/rethook.c
@@ -0,0 +1,33 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+#include <linux/rethook.h>
+#include <linux/kprobes.h>
+
+void arch_rethook_prepare(struct rethook_node *rh, struct pt_regs *regs, bool mcount)
+{
+	rh->ret_addr = regs->gprs[14];
+	rh->frame = regs->gprs[15];
+
+	/* Replace the return addr with trampoline addr */
+	regs->gprs[14] = (unsigned long)&arch_rethook_trampoline;
+}
+NOKPROBE_SYMBOL(arch_rethook_prepare);
+
+void arch_rethook_fixup_return(struct pt_regs *regs,
+			       unsigned long correct_ret_addr)
+{
+	/* Replace fake return address with real one. */
+	regs->gprs[14] = correct_ret_addr;
+}
+NOKPROBE_SYMBOL(arch_rethook_fixup_return);
+
+/*
+ * Called from arch_rethook_trampoline
+ */
+unsigned long arch_rethook_trampoline_callback(struct pt_regs *regs)
+{
+	return rethook_trampoline_handler(regs, regs->gprs[15]);
+}
+NOKPROBE_SYMBOL(arch_rethook_trampoline_callback);
+
+/* assembler function that handles the rethook must not be probed itself */
+NOKPROBE_SYMBOL(arch_rethook_trampoline);
diff --git a/arch/s390/kernel/stacktrace.c b/arch/s390/kernel/stacktrace.c
index 7ee455e8e3d5..0787010139f7 100644
--- a/arch/s390/kernel/stacktrace.c
+++ b/arch/s390/kernel/stacktrace.c
@@ -40,12 +40,12 @@ int arch_stack_walk_reliable(stack_trace_consume_fn consume_entry,
 		if (!addr)
 			return -EINVAL;
 
-#ifdef CONFIG_KPROBES
+#ifdef CONFIG_RETHOOK
 		/*
-		 * Mark stacktraces with kretprobed functions on them
+		 * Mark stacktraces with krethook functions on them
 		 * as unreliable.
 		 */
-		if (state.ip == (unsigned long)__kretprobe_trampoline)
+		if (state.ip == (unsigned long)arch_rethook_trampoline)
 			return -EINVAL;
 #endif