https://bugs.kde.org/show_bug.cgi?id=484935
Bug ID: 484935
Summary: [patch] Valgrind reports false "Conditional jump or
move depends on uninitialised value" errors for
aarch64 signal handlers
Classification: Developer tools
Product: valgrind
Version: unspecified
Platform: Compiled Sources
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: jsew...@acm.org
Reporter: pea...@arista.com
Target Milestone: ---
Created attachment 168062
--> https://bugs.kde.org/attachment.cgi?id=168062&action=edit
Test showing erroneous behaviour for linux/aarch64
Accessing the arguments to signal handlers in aarch64 binaries can create
"Conditional jump or move depends on uninitialized value" diagnostics.
Comparing the code for the aarch64 signal frame creation to that for x86_64
shows the problem - the values for the registers used for passing arguments (X0
thru X3) are modified, but the required `VG_TRACK( post_reg_write, ...` macros
are not invoked to indicate that the registers now have well defined values.
Adding these VG_TRACK macros in fixes the issue.
The attached test.c shows the problem under `valgrind` without the fix, but
succeeds with it.
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