This will be used by bpf_throw() to unwind till the program marked as
exception boundary and run the callback with the stack of the main
program.
This is required for supporting BPF exceptions on ARM64.
Signed-off-by: Puranjay Mohan <puranjay12@xxxxxxxxx>
---
arch/arm64/kernel/stacktrace.c | 26 ++++++++++++++++++++++++++
1 file changed, 26 insertions(+)
diff --git a/arch/arm64/kernel/stacktrace.c b/arch/arm64/kernel/stacktrace.c
index 7f88028a00c0..66cffc5fc0be 100644
--- a/arch/arm64/kernel/stacktrace.c
+++ b/arch/arm64/kernel/stacktrace.c
@@ -7,6 +7,7 @@
#include <linux/kernel.h>
#include <linux/efi.h>
#include <linux/export.h>
+#include <linux/filter.h>
#include <linux/ftrace.h>
#include <linux/kprobes.h>
#include <linux/sched.h>
@@ -266,6 +267,31 @@ noinline noinstr void arch_stack_walk(stack_trace_consume_fn consume_entry,
kunwind_stack_walk(arch_kunwind_consume_entry, &data, task, regs);
}
+struct bpf_unwind_consume_entry_data {
+ bool (*consume_entry)(void *cookie, u64 ip, u64 sp, u64 fp);
+ void *cookie;
+};
+
+static bool
+arch_bpf_unwind_consume_entry(const struct kunwind_state *state, void *cookie)
+{
+ struct bpf_unwind_consume_entry_data *data = cookie;
+
+ return data->consume_entry(data->cookie, state->common.pc, 0,
+ state->common.fp);
+}
+
+noinline noinstr void arch_bpf_stack_walk(bool (*consume_entry)(void *cookie, u64 ip, u64 sp,
+ u64 fp), void *cookie)
+{
+ struct bpf_unwind_consume_entry_data data = {
+ .consume_entry = consume_entry,
+ .cookie = cookie,
+ };
+
+ kunwind_stack_walk(arch_bpf_unwind_consume_entry, &data, current, NULL);
+}
+
static bool dump_backtrace_entry(void *arg, unsigned long where)
{
char *loglvl = arg;
--
2.40.1
