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**[tickets:#397] OpenOCD TCL script execution failure with commit 95603fae1**
**Status:** new
**Milestone:** 0.11.0
**Created:** Sat May 27, 2023 01:28 AM UTC by Daniel Goehring
**Last Updated:** Sat May 27, 2023 01:28 AM UTC
**Owner:** nobody
Hello,
The following commit which is post "openocd-0.12.0 release" has introduced
stability issues in my AArch64 TCL scripting environment and I'm wondering if
others have experienced similar issues.
95603fae1 openocd: revert workarounds for 'expr' syntax change
With this update, while the TCL script runs faster due to the reduction in
polling during math expressions, it does cause script execution instability.
For example, the following TCL scripted sequence previously worked, but now
fails with the update.
// The target being stepped is an Armv8 core in AArch64 state
1. step
2. reg x0
With the update, it appears in the TCL script the "reg x0" operation occurs
before the poller has a chance to determine the CPU has halted from the 'step'
command. OpenOCD then halts the script execution and returns with an error
stating that it's unable to read register x0 because the CPU core isn't halted.
As a workaround, adding a 'sleep' delay between the 'step' and 'reg x0' command
resolves the issue, but it is not ideal.
With this update, it appears that in a TCL script, any command that causes a
processor state change from 'running' to 'halted' followed by a command which
requires the processor to be halted could fail if the poller hasn't updated
processor state between the two commands.
I don't have the background details on this commit (95603fae1), but wanted to
bring it to the attention of the development community.
Daniel Goehring
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