mcause
Machine Cause
Reports the cause of the latest exception.
Attributes
Defining Extension |
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CSR Address |
0x342 |
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Length |
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Privilege Mode |
M |
Software write
This CSR may store a value that is different from what software attempts to write.
When a software write occurs (e.g., through csrrw), the following determines the written value:
INT = # the write only holds if the INT/CODE combination is valid if (csr_value.INT == 1) { if (valid_interrupt_code?(csr_value.CODE)) { return 1; } return ILLEGAL_WLRL; } else { if (valid_exception_code?(csr_value.CODE)) { return 1; } return ILLEGAL_WLRL; } CODE = # the write only holds if the INT/CODE combination is valid if (csr_value.INT == 1) { if (valid_interrupt_code?(csr_value.CODE)) { return csr_value.CODE; } return ILLEGAL_WLRL; } else { if (valid_exception_code?(csr_value.CODE)) { return csr_value.CODE; } return ILLEGAL_WLRL; }