Branch: refs/heads/master
Home: https://github.com/tianocore/edk2
Commit: d3b32dca06b987d7214637f3952c2ce1ce69f308
https://github.com/tianocore/edk2/commit/d3b32dca06b987d7214637f3952c2ce1ce69f308
Author: Ray Ni <[email protected]>
Date: 2024-06-12 (Wed, 12 Jun 2024)
Changed paths:
M MdePkg/Library/BaseLib/CpuDeadLoop.c
Log Message:
-----------
MdePkg/BaseLib: Let CpuDeadLoop() be breakable in debugger
Starting from certain version of Visual Studio C compiler (I don’t
have the exact version. I am using VS2019), CpuDeadLoop is optimized
quite well by compiler.
The compiler does not generate instructions that jump out of the loop
when the "Index" is non-zero.
It becomes harder/impossible for developers to break out of the dead-loop
in debugger.
The new version of CpuDeadLoop() compares a volatile global to a volatile
local. This forces 2 reads and a comparison on every loop iteration.
The local variable can be set to 1 to exit the loop without modifying the
global variable.
Using VS2019 with max opt enabled, The dead-loop can be exit by setting
Index to 1 in a debugger.
Signed-off-by: Michael D Kinney <[email protected]>
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