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add Exception Causes (EXCCAUSE) docu
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‎doc/exception_causes.md

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Exception Causes (EXCCAUSE)
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===========================================
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| EXC-CAUSE Code | Cause Name | Cause Description | Required Option | EXC-VADDR Loaded |
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|:--------------:|:---------------------------|:------------------------------------------------------------------------------------------------------------|:-------------------------|:----------------:|
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| 0 | IllegalInstructionCause | Illegal instruction | Exception | No |
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| 1 | SyscallCause | SYSCALL instruction | Exception | No |
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| 2 | InstructionFetchErrorCause | Processor internal physical address or data error during instruction fetch | Exception | Yes |
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| 3 | LoadStoreErrorCause | Processor internal physical address or data error during load or store | Exception | Yes |
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| 4 | Level1InterruptCause | Level-1 interrupt as indicated by set level-1 bits in the INTERRUPT register | Interrupt | No |
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| 5 | AllocaCause | MOVSP instruction, if caller’s registers are not in the register file | Windowed Register | No |
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| 6 | IntegerDivideByZeroCause | QUOS, QUOU, REMS, or REMU divisor operand is zero | 32-bit Integer Divide | No |
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| 7 | Reserved for Tensilica | | | |
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| 8 | PrivilegedCause | Attempt to execute a privileged operation when CRING ? 0 | MMU | No |
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| 9 | LoadStoreAlignmentCause | Load or store to an unaligned address | Unaligned Exception | Yes |
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| 10..11 | Reserved for Tensilica | | | |
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| 12 | InstrPIFDataErrorCause | PIF data error during instruction fetch | Processor Interface | Yes |
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| 13 | LoadStorePIFDataErrorCause | Synchronous PIF data error during LoadStore access | Processor Interface | Yes |
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| 14 | InstrPIFAddrErrorCause | PIF address error during instruction fetch | Processor Interface | Yes |
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| 15 | LoadStorePIFAddrErrorCause | Synchronous PIF address error during LoadStore access | Processor Interface | Yes |
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| 16 | InstTLBMissCause | Error during Instruction TLB refill | MMU | Yes |
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| 17 | InstTLBMultiHitCause | Multiple instruction TLB entries matched | MMU | Yes |
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| 18 | InstFetchPrivilegeCause | An instruction fetch referenced a virtual address at a ring level less than CRING | MMU | Yes |
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| 19 | Reserved for Tensilica | | | |
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| 20 | InstFetchProhibitedCause | An instruction fetch referenced a page mapped with an attribute that does not permit instruction fetch | Region Protection or MMU | Yes |
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| 21..23 | Reserved for Tensilica | | | |
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| 24 | LoadStoreTLBMissCause | Error during TLB refill for a load or store | MMU | Yes |
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| 25 | LoadStoreTLBMultiHitCause | Multiple TLB entries matched for a load or store | MMU | Yes |
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| 26 | LoadStorePrivilegeCause | A load or store referenced a virtual address at a ring level less than CRING | MMU | Yes |
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| 27 | Reserved for Tensilica | | | |
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| 28 | LoadProhibitedCause | A load referenced a page mapped with an attribute that does not permit loads | Region Protection or MMU | Yes |
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| 29 | StoreProhibitedCause | A store referenced a page mapped with an attribute that does not permit stores | Region Protection or MMU | Yes |
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| 30..31 | Reserved for Tensilica | | | |
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| 32..39 | CoprocessornDisabled | Coprocessor n instruction when cpn disabled. n varies 0..7 as the cause varies 32..39 | Coprocessor | No |
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| 40..63 | Reserved | | | |
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Infos from Xtensa Instruction Set Architecture (ISA) Reference Manual

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