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This register set contains the values of the fsbase and gsbase registers. Note that these registers can already be controlled individually via ptrace(2) via MD operations, so the main reason for adding this is to include these register values in core dumps. In particular, this will enable looking up the value of TLS variables from core dumps in gdb. The value of NT_X86_SEGBASES was chosen to match the value of NT_386_TLS on Linux. The notes serve similar purposes, but FreeBSD will never dump a note equivalent to NT_386_TLS (which dumps a single segment descriptor rather than a pair of addresses) and picking a currently-unused value in the NT_X86_* range could result in a future conflict. Reviewed by: markj Differential Revision: https://reviews.freebsd.org/D34650 |
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