Bug 243236 - show devmap (ddb) prints garbage on a 32-bit arm system
Summary: show devmap (ddb) prints garbage on a 32-bit arm system
Status: New
Alias: None
Product: Base System
Classification: Unclassified
Component: arm (show other bugs)
Version: CURRENT
Hardware: arm Any
: --- Affects Only Me
Assignee: freebsd-arm mailing list
URL:
Keywords: patch
Depends on:
Blocks:
 
Reported: 2020-01-10 05:24 UTC by Thomas Skibo
Modified: 2020-01-10 05:36 UTC (History)
0 users

See Also:

Attachments
potential fix for show devmap problem (459 bytes, text/plain)
2020-01-10 05:24 UTC, Thomas Skibo 		no flags Details
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Description Thomas Skibo 2020-01-10 05:24:15 UTC 
Created attachment 210583 [details]
potential fix for show devmap problem

When I break into the debugger on an armv7 machine, show devmap gives me this:

db> show devmap
Static device mappings:
  0xffc00000e02fffff - 0x00000001 mapped at VA 0xc006dffcd619c9d0
  0xfec00000f8ffffff - 0x00000001 mapped at VA 0xc006dffcd619c9d0

It should look like this:

db> show devmap
Static device mappings:
  0xe0000000 - 0xe02fffff mapped at VA 0xffc00000
  0xf8000000 - 0xf8ffffff mapped at VA 0xfec00000

Looks like its due to r355925.

I have attached a potential fix but I can't test it on an aarch64
system because mine doesn't have any static device mappings.