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author | Ray Ni <ray.ni@intel.com> | 2024-06-11 15:00:41 +0800 |
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committer | mergify[bot] <37929162+mergify[bot]@users.noreply.github.com> | 2024-06-12 07:18:12 +0000 |
commit | d3b32dca06b987d7214637f3952c2ce1ce69f308 (patch) | |
tree | e9ec5dffb4478cf8031b1e9a75b02840a4d29e1c /CryptoPkg/Library/OpensslLib | |
parent | 0982da4f50279bfb2be479f97821b86feb87c336 (diff) | |
download | edk2-master.tar.gz edk2-master.tar.bz2 edk2-master.zip |
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 <michael.d.kinney@intel.com>
Diffstat (limited to 'CryptoPkg/Library/OpensslLib')
0 files changed, 0 insertions, 0 deletions