Page MenuHomeFreeBSD
Differential D16469

fix TRAPF_USERMODE macro
ClosedPublic
Actions

Authored by br on Jul 27 2018, 3:04 PM.
Tags
None
Referenced Files
Unknown Object (File)
Wed, Mar 26, 3:48 AM
Unknown Object (File)
Mar 4 2025, 11:02 AM
Unknown Object (File)
Feb 21 2025, 2:45 PM
Unknown Object (File)
Feb 20 2025, 2:24 AM
Unknown Object (File)
Dec 13 2024, 6:05 PM
Unknown Object (File)
Dec 10 2024, 7:33 PM
Unknown Object (File)
Nov 16 2024, 4:43 PM
Unknown Object (File)
Nov 13 2024, 2:34 PM
View All 20 Files
Subscribers
imp

Details

Reviewers
markj
Commits
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"

Diff Detail

Repository
rS FreeBSD src repository - subversion
Lint
Lint Not Applicable
Unit
Tests Not Applicable

Event Timeline

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

Revision Contents
Changeset List

PathSize
head/
sys/
riscv/
include/
4 lines

Diff 45912

View Options

head/sys/riscv/include/cpu.h

Loading...