tools/testing/selftests/bpf/progs/test_global_func_ctx_args.c

Source file repositories/reference/linux-study-clean/tools/testing/selftests/bpf/progs/test_global_func_ctx_args.c

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/bpf/progs/test_global_func_ctx_args.c
Extension
.c
Size
3618 bytes
Lines
173
Domain
Support Tooling And Documentation
Bucket
tools
Inferred role
Support Tooling And Documentation: implementation source
Status
source implementation candidate

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

struct bpf_user_pt_regs_t {};

__weak int kprobe_workaround_ctx_subprog(struct bpf_user_pt_regs_t *ctx)
{
	return bpf_get_stack(ctx, &stack, sizeof(stack), 0);
}

SEC("?kprobe")
__success
int kprobe_workaround_ctx(void *ctx)
{
	return kprobe_workaround_ctx_subprog(ctx);
}

/*
 * RAW_TRACEPOINT contexts
 */

__weak int raw_tp_ctx_subprog(struct bpf_raw_tracepoint_args *ctx)
{
	return bpf_get_stack(ctx, &stack, sizeof(stack), 0);
}

SEC("?raw_tp")
__success
int raw_tp_ctx(void *ctx)
{
	return raw_tp_ctx_subprog(ctx);
}

/*
 * RAW_TRACEPOINT_WRITABLE contexts
 */

__weak int raw_tp_writable_ctx_subprog(struct bpf_raw_tracepoint_args *ctx)
{
	return bpf_get_stack(ctx, &stack, sizeof(stack), 0);
}

SEC("?raw_tp")
__success
int raw_tp_writable_ctx(void *ctx)
{
	return raw_tp_writable_ctx_subprog(ctx);
}

/*
 * PERF_EVENT contexts
 */

__weak int perf_event_ctx_subprog(struct bpf_perf_event_data *ctx)
{
	return bpf_get_stack(ctx, &stack, sizeof(stack), 0);
}

SEC("?perf_event")
__success
int perf_event_ctx(void *ctx)
{
	return perf_event_ctx_subprog(ctx);
}

/* this global subprog can be now called from many types of entry progs, each
 * with different context type
 */
__weak int subprog_ctx_tag(void *ctx __arg_ctx)
{
	return bpf_get_stack(ctx, stack, sizeof(stack), 0);
}

struct my_struct { int x; };

__weak int subprog_multi_ctx_tags(void *ctx1 __arg_ctx,
				  struct my_struct *mem,
				  void *ctx2 __arg_ctx)
{
	if (!mem)
		return 0;

	return bpf_get_stack(ctx1, stack, sizeof(stack), 0) +
	       mem->x +
	       bpf_get_stack(ctx2, stack, sizeof(stack), 0);
}

SEC("?raw_tp")
__success __log_level(2)
int arg_tag_ctx_raw_tp(void *ctx)
{
	struct my_struct x = { .x = 123 };

Annotation

Implementation Notes