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Commit aa0f7f3
gdb: support async interrupt (ctrl-c) to break into a running guest
The stub drove continue by calling emu_start synchronously and only read
the socket again once the target stopped on its own, so the bare \x03 break
byte a client sends to pause a running target was never seen. A guest that
free-runs (e.g. an idle/event loop) could not be interrupted at all --
gdb/Ghidra reported 'Cannot execute this command while the target is running'.
Poll the client socket for the break byte from the per-instruction run hook
(dbg_hook), which does run on the emulation thread during emu_start:
- GdbSerialConn.poll_interrupt(): non-blocking select+recv, True on \x03.
- QlGdbUtils.dbg_hook: throttled (every INTR_POLL_INTERVAL insns) check of an
installed check_interrupt callback; on a break, stop emulation and record it.
- handle_c: reply SIGINT when the stop was an interrupt rather than a
breakpoint or normal exit.
Verified against a free-running MIPS64 BE guest: \x03 -> S02 in <1ms; the
existing gdb-stub regression test still passes.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>1 parent b3fa0a2 commit aa0f7f3
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