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arm64: stacktrace: Implement arch_bpf_stack_walk() for the BPF JIT

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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@gmail.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Link: https://lore.kernel.org/r/20240201125225.72796-2-puranjay12@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Puranjay Mohan 2024-02-01 12:52:24 +00:00 committed by Alexei Starovoitov
parent 2ab256e932
commit e74cb1b422
1 changed files with 26 additions and 0 deletions
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26
arch/arm64/kernel/stacktrace.c
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@ -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;