Add backtrace infrastructure and binary analysis tooling

[zouguangxian]

Summary

This PR adds comprehensive backtrace and binary analysis capabilities to ZeroOS:

New Infrastructure

• zeroos-backtrace crate: Frame pointer and DWARF-based backtrace support
• elf-report crate: Binary size analysis and symbol mapping tool
• analyze_backtrace command: Analyze backtrace output from binaries
• build-backtrace.sh: Build script for backtrace-enabled binaries

Improved Tooling

• check_workspace: Enforce workspace consistency rules on package versions
• massage: Run common cargo tasks (fix, clippy, fmt, check, test) on packages
• spike_syscall_instcount: Measure syscall instruction counts from Spike logs
• Reorganized xtask commands under cmds/ module

Other Improvements

• Enhanced pre-commit hook with automatic PATH expansion for tool discovery
• Improved error messages when tools are missing
• Updated runtime panic handling to support backtraces
• Build system and linker configuration improvements
• Added AGENTS.md documentation

Test Plan

• Build with backtrace support: ./build-backtrace.sh
• Run binary size analysis: cargo run -p elf-report -- <binary>
• Test xtask commands: cargo xtask check_workspace, cargo xtask massage
• Verify pre-commit hook works with PATH expansion

Changes

• 47 files changed, 2802 insertions(+), 78 deletions(-)
• New crates: zeroos-backtrace, elf-report
• Updated runtime crates to integrate backtrace support

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PR Summary

High Risk
Touches core build/linker configuration and panic/backtrace paths across runtimes, with new unsafe stack-walking code and new cfg-driven compilation modes that could affect guest binaries and debugging behavior.

Overview
Adds a new zeroos-backtrace crate and wires runtimes/platform panic paths to a single Backtrace interface selected via cfg(zeroos_backtrace) (off, dwarf, frame_pointers), replacing the prior feature-gated backtrace plumbing.

Updates zeroos-build to expose explicit backtrace modes on cargo spike build, set the corresponding cfg + required RUSTFLAGS (unwind tables vs frame pointers), and rename linker/target-spec templating from backtrace to EMIT_UNWIND_TABLES so .eh_frame emission is controlled independently.

Introduces a new elf-report crate (CLI + library) to inspect ELF section sizes and largest .text/.rodata symbols, with optional GNU ld map parsing for stripped binaries, and adds an xtask analyze-backtrace command to build a matrix of backtrace configurations and report size deltas using elf-report.

Improves developer workflow by enhancing the Rust pre-commit hook (better exec error messages, PATH expansion, workspace check + matrix fix/clippy/check task ordering) and updating build scripts/matrix config to use the new backtrace modes.

^{Written by Cursor Bugbot for commit f659716. This will update automatically on new commits. Configure here.}

[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	cargo/​object@​0.36.7
	cargo/​rustc-demangle@​0.1.27

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Cursor Bugbot has reviewed your changes and found 1 potential issue.