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Remove unused fields from struct pcb.
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Authored by jhb on Jan 28 2020, 11:31 AM.
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Details

Summary

cpu_switch/throw() and savectx() do not save or restore any values
in these fields which mostly held non-callee-save registers.

makectx() copied these fields from kdb_frame, but they weren't used
except for PC_REGS using pcb_sepc. Change PC_REGS to use
kdb_frame->tf_sepc directly instead.

Test Plan
  • booted qemu, stack traces work for both curthread and other threads in ddb

Diff Detail

Repository
rS FreeBSD src repository - subversion
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