On Wed, Jul 24, 2019 at 12:27:38PM -0700, Andrii Nakryiko wrote:
> Add tests for various array handling/relocation scenarios.
>
> Signed-off-by: Andrii Nakryiko <andriin@xxxxxx>
...
> +
> +#define CORE_READ(dst, src) \
> + bpf_probe_read(dst, sizeof(*src), __builtin_preserve_access_index(src))
This is the key accessor that all progs will use.
Please split just this single macro into individual commit and add
detailed comment about its purpose and
what __builtin_preserve_access_index() does underneath.
> +SEC("raw_tracepoint/sys_enter")
> +int test_core_nesting(void *ctx)
> +{
> + struct core_reloc_arrays *in = (void *)&data.in;
> + struct core_reloc_arrays_output *out = (void *)&data.out;
> +
> + /* in->a[2] */
> + if (CORE_READ(&out->a2, &in->a[2]))
> + return 1;
> + /* in->b[1][2][3] */
> + if (CORE_READ(&out->b123, &in->b[1][2][3]))
> + return 1;
