https://bugs.kde.org/show_bug.cgi?id=418795
Bug ID: 418795
Summary: command line to inform valgrind of symbols for code
that is loaded outside of the normal flow
Product: valgrind
Version: 3.15 SVN
Platform: Other
OS: Linux
Status: REPORTED
Severity: wishlist
Priority: NOR
Component: general
Assignee: jsew...@acm.org
Reporter: jeffersoncarpent...@gmail.com
Target Milestone: ---
SUMMARY
gdb has an "add-symbol-file" command to inform the debugger of the symbols to
use for code loaded into a certain address. It would be nice if Valgrind had
this feature too. In addition to giving more complete stack traces for errors
that occur in dynamically loaded code, this can be used in conjunction with
suppression files to suppress errors in such code.
Use case: Debugging windows executables under wine, the subroutine `chkstk` is
called, and part of the correct behavior for that function is to read past the
end of the stack. These executables are loaded outside of the normal dlopen
flow, and so valgrind does not have symbol information. The chkstk errors can
be suppressed using --ignore-range-below-sp, but this could prevent valgrind
from picking up real errors.
STEPS TO REPRODUCE (Desired behavior):
1. valgrind --suppressions=chkstk.supp --add-symbol-file=./main.exe@0x0040100
--trace-children-yes wine main.exe
No desire on the specific command line syntax for adding symbol info.
OBSERVED RESULT (Desired result):
With a suitable suppressions file, valgrind ignores errors that occur in
__chkstk_ms.
Without the suppressions file, trace includes:
Invalid read of size 4
at 0x402424: __chkstk_ms (cygwin.S:158)
Instead of:
Invalid read of size 4
at 0x402424: ???
ADDITIONAL INFORMATION:
I asked about this feature in this email thread
https://sourceforge.net/p/valgrind/mailman/message/36810610/
Julian did suggest using --ignore-range-below-sp but did not say the feature
was a bad idea, so I am posting it here.
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