When linker-inserted padding breaks list integrity, pointer arithmetic
like (end - start) / sizeof(struct) produces garbage. GCC optimizes
division by constants using multiplicative inverses, which only works
when the dividend is an exact multiple. With padding, outputs like
"Running -858993444 bloblist tests" appear instead of the correct count.
Enhance the linker list checking script to detect these problems by
adding symbol size tracking using nm -S. This enables:
1. Padding detection: Compare symbol sizes to gaps. If gap > size,
padding was inserted, breaking contiguous array assumptions.
2. Pointer arithmetic bugs: Check if (end - start) marker span is a
multiple of struct size.
Co-developed-by: Claude <noreply@anthropic.com>
Signed-off-by: Simon Glass <simon.glass@canonical.com>
If linker lists have inconsistent alignment it can cause strange
runtime errors. Add a script that can detect and report these problems.
Signed-off-by: Simon Glass <sjg@chromium.org>
