Embedded Systems Error Code
Systems & Devices
Embedded Systems
SVCALL | Supervisor call
Industry
Systems & Devices
Canonical
/systems/embedded-systems/error-codes/svcall/
Last Updated
Feb 27, 2026
Summary
A supervisor call handler was invoked; in RTOS systems this can be part of normal operation or indicate a fault if unexpected.
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What This Code Means
SVC (supervisor call) is used by some operating systems/RTOS kernels to request privileged operations. Seeing it as an “error” usually means the system trapped in or reported the SVC handler unexpectedly, which can indicate misconfigured privilege mode, stack issues, or incorrect exception handling.
Where Users Usually See This Code
- RTOS-based devices with crash reporting
- During context switching or system calls
Why This Code Appears
- Kernel/RTOS exception reporting surfaced an SVC event
- Stack corruption or invalid return flow
- Incorrect privilege configuration
What Typically Happens Next
- Device may reset or enter a fault mode
What This Code Is Not
- It is not a user-facing “app error code”
- It is not a networking error
Troubleshooting Checklist
- □ Capture stack trace and exception context
- □ Review RTOS configuration and recent changes around system calls/interrupt priorities
Notes And Edge Cases
In some debug builds, SVC may be used intentionally; correlate with firmware logging level and build type.
Related Codes
8 links
- BUSFAULT CodeBus fault exception
- PENDSV CodePendSV exception
- ILLEGAL INSTRUCTION CodeInvalid CPU instruction
- WATCHDOG RESET CodeWatchdog triggered
- HARDFAULT CodeCPU fault exception
- ASSERTION FAILED CodeRuntime assertion
- BROWNOUT RESET CodeUndervoltage event
- USAGEFAULT CodeUsage fault exception
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