543843 - Breakpad should produce stack traces for ARM Linux minidumps

Status: RESOLVED FIXED

(Toolkit :: Crash Reporting, defect)

Description

[Jim Blandy :jimb]

At the moment, the Breakpad processor ARM stack walker is a stub: it only gives you the top stack frame.  Doing full backtraces on the ARM requires the DWARF CFI support in bug 464750, and some additional work to hook the CFI stuff into the ARM stack walker.

The SimpleCFIWalker is supposed to be something that many architectures can use to get CFI-driven stack walking going quickly; you give it a map of the relevant registers and it does the rest.

Comment 1

[Jim Blandy :jimb]

Code written, seems to run, needs more tests:
http://hg.mozilla.org/users/jblandy_mozilla.com/breakpad-mq/file/2b1db0a3ff56

Post to mailing list:
http://groups.google.com/group/google-breakpad-dev/browse_thread/thread/13c02785ff8560f7

Comment 2

[Jim Blandy :jimb]

For what it's worth: didn't end up using SimpleCFIWalker as mentioned in comment 0, since that API assumes that you can have a pointer-to-member for each register. If a raw context structure uses an array to hold a bank of registers, C++ won't let me create a pointer-to-member that refers to an element of such an array. So the SimpleCFIWalker API is not useful on architectures whose raw context structures use arrays.

Comment 3

[Jim Blandy :jimb]

Landed in upstream sources.