Page MenuHomeFreeBSD

dtrace_asm.S: properly enter/exit user access
ClosedPublic

Authored by mhorne on Jan 31 2023, 7:26 PM.
Tags
None
Referenced Files
Unknown Object (File)
Thu, Jul 4, 2:52 PM
Unknown Object (File)
May 16 2024, 8:39 PM
Unknown Object (File)
May 16 2024, 8:39 PM
Unknown Object (File)
May 16 2024, 8:39 PM
Unknown Object (File)
May 16 2024, 8:39 PM
Unknown Object (File)
May 14 2024, 8:46 PM
Unknown Object (File)
May 6 2024, 3:20 AM
Unknown Object (File)
May 5 2024, 9:21 PM
Subscribers

Details

Summary

In order to read or write userspace memory without generating an access
fault, we must first enable the SUM bit in the sstatus CSR.

Diff Detail

Repository
rG FreeBSD src repository
Lint
Lint Not Applicable
Unit
Tests Not Applicable

Event Timeline

sys/cddl/dev/dtrace/riscv/dtrace_asm.S
151

What is 1b referring to here?

152–154

There are multiple jumps to 2, but they are not consistent about whether SUM is set.

mhorne added inline comments.
sys/cddl/dev/dtrace/riscv/dtrace_asm.S
151

Yikes!

This revision is now accepted and ready to land.Feb 6 2023, 6:22 PM
This revision was automatically updated to reflect the committed changes.
mhorne marked an inline comment as done.