arm64: stacktrace: factor out kernel unwind state

On arm64 we share some unwinding code between the regular kernel
unwinder and the KVM hyp unwinder. Some of this common code only matters
to the regular unwinder, e.g. the `kr_cur` and `task` fields in the
common struct unwind_state.

We're likely to add more state which only matters for regular kernel
unwinding (or only for hyp unwinding). In preparation for such changes,
this patch factors out the kernel-specific state into a new struct
kunwind_state, and updates the kernel unwind code accordingly.

There should be no functional change as a result of this patch.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Kalesh Singh <kaleshsingh@google.com>
Cc: Madhavan T. Venkataraman <madvenka@linux.microsoft.com>
Cc: Mark Brown <broonie@kernel.org>
Cc: Puranjay Mohan <puranjay12@gmail.com>
Cc: Will Deacon <will@kernel.org>
Reviewed-by: Puranjay Mohan <puranjay12@gmail.com>
Reviewed-by: Kalesh Singh <kaleshsingh@google.com>
Reviewed-by: Madhavan T. Venkataraman <madvenka@linux.microsoft.com>
Reviewed-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20231124110511.2795958-2-mark.rutland@arm.com
Signed-off-by: Will Deacon <will@kernel.org>

1 files changed, 72 insertions, 41 deletions

diff --git a/arch/arm64/kernel/stacktrace.c b/arch/arm64/kernel/stacktrace.c
index 17f66a74c745..aafc89192787 100644
--- a/arch/arm64/kernel/stacktrace.c
+++ b/arch/arm64/kernel/stacktrace.c
@@ -8,6 +8,7 @@
 #include <linux/efi.h>
 #include <linux/export.h>
 #include <linux/ftrace.h>
+#include <linux/kprobes.h>
 #include <linux/sched.h>
 #include <linux/sched/debug.h>
 #include <linux/sched/task_stack.h>
@@ -19,6 +20,31 @@
 #include <asm/stacktrace.h>
 
 /*
+ * Kernel unwind state
+ *
+ * @common:      Common unwind state.
+ * @task:        The task being unwound.
+ * @kr_cur:      When KRETPROBES is selected, holds the kretprobe instance
+ *               associated with the most recently encountered replacement lr
+ *               value.
+ */
+struct kunwind_state {
+	struct unwind_state common;
+	struct task_struct *task;
+#ifdef CONFIG_KRETPROBES
+	struct llist_node *kr_cur;
+#endif
+};
+
+static __always_inline void
+kunwind_init(struct kunwind_state *state,
+	     struct task_struct *task)
+{
+	unwind_init_common(&state->common);
+	state->task = task;
+}
+
+/*
  * Start an unwind from a pt_regs.
  *
  * The unwind will begin at the PC within the regs.
@@ -26,13 +52,13 @@
  * The regs must be on a stack currently owned by the calling task.
  */
 static __always_inline void
-unwind_init_from_regs(struct unwind_state *state,
-		      struct pt_regs *regs)
+kunwind_init_from_regs(struct kunwind_state *state,
+		       struct pt_regs *regs)
 {
-	unwind_init_common(state, current);
+	kunwind_init(state, current);
 
-	state->fp = regs->regs[29];
-	state->pc = regs->pc;
+	state->common.fp = regs->regs[29];
+	state->common.pc = regs->pc;
 }
 
 /*
@@ -44,12 +70,12 @@ unwind_init_from_regs(struct unwind_state *state,
  * The function which invokes this must be noinline.
  */
 static __always_inline void
-unwind_init_from_caller(struct unwind_state *state)
+kunwind_init_from_caller(struct kunwind_state *state)
 {
-	unwind_init_common(state, current);
+	kunwind_init(state, current);
 
-	state->fp = (unsigned long)__builtin_frame_address(1);
-	state->pc = (unsigned long)__builtin_return_address(0);
+	state->common.fp = (unsigned long)__builtin_frame_address(1);
+	state->common.pc = (unsigned long)__builtin_return_address(0);
 }
 
 /*
@@ -63,35 +89,38 @@ unwind_init_from_caller(struct unwind_state *state)
  * call this for the current task.
  */
 static __always_inline void
-unwind_init_from_task(struct unwind_state *state,
-		      struct task_struct *task)
+kunwind_init_from_task(struct kunwind_state *state,
+		       struct task_struct *task)
 {
-	unwind_init_common(state, task);
+	kunwind_init(state, task);
 
-	state->fp = thread_saved_fp(task);
-	state->pc = thread_saved_pc(task);
+	state->common.fp = thread_saved_fp(task);
+	state->common.pc = thread_saved_pc(task);
 }
 
 static __always_inline int
-unwind_recover_return_address(struct unwind_state *state)
+kunwind_recover_return_address(struct kunwind_state *state)
 {
 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
 	if (state->task->ret_stack &&
-	    (state->pc == (unsigned long)return_to_handler)) {
+	    (state->common.pc == (unsigned long)return_to_handler)) {
 		unsigned long orig_pc;
-		orig_pc = ftrace_graph_ret_addr(state->task, NULL, state->pc,
-						(void *)state->fp);
-		if (WARN_ON_ONCE(state->pc == orig_pc))
+		orig_pc = ftrace_graph_ret_addr(state->task, NULL,
+						state->common.pc,
+						(void *)state->common.fp);
+		if (WARN_ON_ONCE(state->common.pc == orig_pc))
 			return -EINVAL;
-		state->pc = orig_pc;
+		state->common.pc = orig_pc;
 	}
 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */
 
 #ifdef CONFIG_KRETPROBES
-	if (is_kretprobe_trampoline(state->pc)) {
-		state->pc = kretprobe_find_ret_addr(state->task,
-						    (void *)state->fp,
-						    &state->kr_cur);
+	if (is_kretprobe_trampoline(state->common.pc)) {
+		unsigned long orig_pc;
+		orig_pc = kretprobe_find_ret_addr(state->task,
+						  (void *)state->common.fp,
+						  &state->kr_cur);
+		state->common.pc = orig_pc;
 	}
 #endif /* CONFIG_KRETPROBES */
 
@@ -106,38 +135,38 @@ unwind_recover_return_address(struct unwind_state *state)
  * and the location (but not the fp value) of B.
  */
 static __always_inline int
-unwind_next(struct unwind_state *state)
+kunwind_next(struct kunwind_state *state)
 {
 	struct task_struct *tsk = state->task;
-	unsigned long fp = state->fp;
+	unsigned long fp = state->common.fp;
 	int err;
 
 	/* Final frame; nothing to unwind */
 	if (fp == (unsigned long)task_pt_regs(tsk)->stackframe)
 		return -ENOENT;
 
-	err = unwind_next_frame_record(state);
+	err = unwind_next_frame_record(&state->common);
 	if (err)
 		return err;
 
-	state->pc = ptrauth_strip_kernel_insn_pac(state->pc);
+	state->common.pc = ptrauth_strip_kernel_insn_pac(state->common.pc);
 
-	return unwind_recover_return_address(state);
+	return kunwind_recover_return_address(state);
 }
 
 static __always_inline void
-unwind(struct unwind_state *state, stack_trace_consume_fn consume_entry,
-       void *cookie)
+do_kunwind(struct kunwind_state *state, stack_trace_consume_fn consume_entry,
+	   void *cookie)
 {
-	if (unwind_recover_return_address(state))
+	if (kunwind_recover_return_address(state))
 		return;
 
 	while (1) {
 		int ret;
 
-		if (!consume_entry(cookie, state->pc))
+		if (!consume_entry(cookie, state->common.pc))
 			break;
-		ret = unwind_next(state);
+		ret = kunwind_next(state);
 		if (ret < 0)
 			break;
 	}
@@ -190,22 +219,24 @@ noinline noinstr void arch_stack_walk(stack_trace_consume_fn consume_entry,
 		STACKINFO_EFI,
 #endif
 	};
-	struct unwind_state state = {
-		.stacks = stacks,
-		.nr_stacks = ARRAY_SIZE(stacks),
+	struct kunwind_state state = {
+		.common = {
+			.stacks = stacks,
+			.nr_stacks = ARRAY_SIZE(stacks),
+		},
 	};
 
 	if (regs) {
 		if (task != current)
 			return;
-		unwind_init_from_regs(&state, regs);
+		kunwind_init_from_regs(&state, regs);
 	} else if (task == current) {
-		unwind_init_from_caller(&state);
+		kunwind_init_from_caller(&state);
 	} else {
-		unwind_init_from_task(&state, task);
+		kunwind_init_from_task(&state, task);
 	}
 
-	unwind(&state, consume_entry, cookie);
+	do_kunwind(&state, consume_entry, cookie);
 }
 
 static bool dump_backtrace_entry(void *arg, unsigned long where)