[Lisoon22]

Checklist

Which kind of PR do you create?

• This PR only contains minor fixes.
• This PR contains major feature update.
• This PR introduces a new function/api for Qiling Framework.

Coding convention?

• The new code conforms to Qiling Framework naming convention.
• The imports are arranged properly.
• Essential comments are added. (No additional code comments are needed for this one-line fix; the loader contract is documented.)
• The reference of the new code is pointed out. (Fixes Shellcode does not have an entry_point set #1608.)

Extra tests?

• No extra tests are needed for this PR.
• I have added enough tests for this PR.
• Tests will be added after some discussion and review.

Changelog?

• This PR doesn't need to update Changelog.
• Changelog will be updated after some proper review.
• Changelog has been updated in my PR.

Target branch?

• The target branch is dev branch.

One last thing

• I have read the contribution guide

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ELF shellcode loading sets the OS entry point and load address but leaves the loader entry point undefined. Initializing Qdb then raises AttributeError when it reads ql.loader.entry_point.

Set the loader entry point to the mapped shellcode start while preserving Qiling.entry_point as the optional run(begin=...) override.

Add a regression that initializes real Qdb instances for x86 and x86-64 shellcode, mocking only the interactive command loop and context rendering. It verifies the mapped code, initial PC and debugger startup.

Fixes #1608.

Validation

• The regression fails before the fix with the reported AttributeError on both architectures.
• The focused Qdb regression and existing shellcode suite pass: 9 tests, including x86 and x86-64 subtests.
• These 9 tests also pass locally on Arch Linux with Python 3.12.16 and Unicorn 2.1.3.
• Additional validation on Linux with Python 3.12.14: ordinary x86-64 ELF loading, ARM Qdb and ARM U-Boot tests pass.
• The patch applies to a clean worktree, where the focused regression and shellcode suite also pass.
• CLI help, Python syntax checks and git diff --check pass.