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Oct 26, 2018
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Fault handler doc update #793

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a98d02d
Fault handler doc update
SenRamakri Oct 15, 2018
ddf7122
Edit changes to debug_fault_exception.md
Oct 16, 2018
648e7ac
Fix link format in debug_fault_exception.md
Oct 26, 2018
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26 changes: 14 additions & 12 deletions docs/tutorials/debug/debug_fault_exception.md
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Expand Up @@ -15,7 +15,9 @@ Please look at the **Technical Reference Manual** and **Arm Architecture Referen

For example, Cortex-M0/M0+ processors (or any ARMv6M processors) do not have MemManage, BusFault and UsageFault exceptions implemented. In those cases, all exceptions are reported as HardFault exception. For ARMv7M processors, MemManage, BusFault and UsageFault exceptions trigger only if they are enabled in System Handler Control and State Register (**SHCSR**).

Below is an example of the crash dump (with a description of registers) that the Mbed OS fault exception handler generates.
Below is an example of the crash dump (with a description of registers) that the Mbed OS fault exception handler generates. Note that the system also invokes the Mbed OS error handler when an exception happens and prints out the error information, as well.

Please see the [Error API reference](/docs/development/apis/error-handling.html) for more about error information.

```
++ MbedOS Fault Handler ++
Expand Down Expand Up @@ -54,18 +56,18 @@ Mode : Thread - Processor mode at the time of exception
Priv : Privileged - Privilege level at the time of exception
Stack: PSP - Stack pointer in use at the time of exception

Thread Info:
Current:
State: 00000002 EntryFn: 00002595 Stack Size: 00001000 Mem: 20001EA0 SP: 20002E60
Next:
State: 00000002 EntryFn: 00002595 Stack Size: 00001000 Mem: 20001EA0 SP: 20002E60
Wait Threads:
State: 00000083 EntryFn: 00004205 Stack Size: 00000300 Mem: 20000E18 SP: 200010B0
Delay Threads:
Idle Thread:
State: 00000001 EntryFn: 00002715 Stack Size: 00000200 Mem: 20001118 SP: 200012D8

-- MbedOS Fault Handler --


++ MbedOS Error Info ++
Error Status: 0x80FF013D Code: 317 Module: 255
Error Message: Fault exception
Location: 0x5B25
Error Value: 0x5946
Current Thread: Id: 0x20001E80 Entry: 0x5D05 StackSize: 0x1000 StackMem: 0x20000E80 SP: 0x2002FF90
For more info, visit: https://armmbed.github.io/mbedos-error/?error=0x80FF013D
-- MbedOS Error Info --

```

### Analyzing crash dump
Expand Down