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Differential D16469

fix TRAPF_USERMODE macro
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Authored by br on Jul 27 2018, 3:04 PM.
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rS336766: Use SPP (Supervisor Previous Privilege) bit in the sstatus
Summary

Use SPP (supervisor previous privilege) bit in sstatus register to determine if trap is from userspace.

Otherwise if we jump to kernel address from userspace, then TRAPF_USERMODE failed to detect usermode and then do_ast triggers a panic "ast in kernel mode"

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rS FreeBSD src repository - subversion
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br created this revision.Jul 27 2018, 3:04 PM
markj accepted this revision.Jul 27 2018, 3:50 PM
This revision is now accepted and ready to land.Jul 27 2018, 3:50 PM
Closed by commit rS336766: Use SPP (Supervisor Previous Privilege) bit in the sstatus (authored by br). · Explain WhyJul 27 2018, 4:13 PM
This revision was automatically updated to reflect the committed changes.
Herald added a subscriber: imp. · View Herald TranscriptJul 27 2018, 4:13 PM

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head/
sys/
riscv/
include/
4 lines

Diff 45912

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head/sys/riscv/include/cpu.h

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