[haiku-bugs] Re: [Haiku] #9773: Add exception breakpoint support
- From: "anevilyak" <trac@xxxxxxxxxxxx>
- Date: Sun, 09 Jun 2013 18:16:48 -0000
#9773: Add exception breakpoint support
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Reporter: bonefish | Owner: anevilyak
Type: enhancement | Status: in-progress
Priority: normal | Milestone: Unscheduled
Component: Applications/Debugger | Version: R1/Development
Resolution: | Keywords:
Blocked By: 9713 | Blocking:
Has a Patch: 0 | Platform: All
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Comment (by anevilyak):
From some initial tests, trapping these functions does indeed work as
expected as far as stopping the program when the exception is initially
thrown. However, on gcc4.x this leads us to a problem due to some missing
pieces in our x86 architecture support. Specifically, {{{__cxa_throw}}}
appears to get built as a frameless function, as a consequence of which we
don't actually wind up correctly unwinding to the location where the
exception was actually thrown.
I can work around this by breaking at {{{__cxa_allocate_exception}}}
instead, but ideally it'd be nice to have proper frameless support
anyways, especially as this will also be needed for x86-64 in general,
since the ABI default there is omit-frame-pointer. Can you shed any light
as to what it would take to resolve
http://haiku.it.su.se:8180/source/xref/src/apps/debugger/arch/x86/ArchitectureX86.cpp#309
? I must admit at the moment my knowledge of that area is woefully
inadequate.
--
Ticket URL: <http://dev.haiku-os.org/ticket/9773#comment:8>
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