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This is useful for exposing additional registers to debuggers. For instance, control registers are now available on amd64 when using gdb to debug a guest. The stub indicates support by including the string "qXfer:features:read+" in its feature list. The debugger queries for target descriptions by sending the query "qXfer:features:read:" followed by a file path. The XML definitions are copied from QEMU and installed to /usr/share/bhyve/gdb. Note that we currently don't handle the SIMD registers at all, since that's of somewhat limited utility (for me at least) and since that requires new ioctls to fetch the register values. Reviewed by: jhb MFC after: 2 weeks Sponsored by: Innovate UK Differential Revision: https://reviews.freebsd.org/D43666 |
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