NOTE:Work in progress. Not all registers are included here yet.
| Name | Number | Priviledge | Width | Feature/Extensions | Description |
|---|---|---|---|---|---|
| cycle | 0x0c00 | URO | hypervisor | Cycle counter for RDCYCLE instruction. | |
| cycleh | 0x0c80 | URO | machine | Upper 32 bits of cycle, RV32I only. | |
| dcsr | 0x07b0 | DRW | Debug control and status register. | ||
| dpc | 0x07b1 | DRW | debug | Debug PC. | |
| dscratch0 | 0x07b2 | DRW | debug | Debug scratch register 0. | |
| dscratch1 | 0x07b3 | DRW | debug | Debug scratch register 1. | |
| fcsr | 0x0003 | URW | machine | Floating-Point Control and Status | |
| fflags | 0x0001 | URW | memory | Floating-Point Accrued Exceptions. | |
| frm | 0x0002 | URW | dep-table | Floating-Point Dynamic Rounding Mode. | |
| hcounteren | 0x0606 | HRW | hypervisor | Hypervisor counter enable. | |
| hedeleg | 0x0602 | HRW | hypervisor | Hypervisor exception delegation register. | |
| hgatp | 0x0680 | HRW | hypervisor | Hypervisor guest address translation and protection. | |
| hgeie | 0x0607 | HRW | hypervisor | Hypervisor guest external interrupt-enable register. | |
| hgeip | 0x0e07 | HRO | hypervisor | Hypervisor guest external interrupt pending. | |
| hideleg | 0x0603 | HRW | hypervisor | Hypervisor interrupt delegation register. | |
| hie | 0x0604 | HRW | hypervisor | Hypervisor interrupt-enable register. | |
| hip | 0x0644 | HRW | hypervisor | Hypervisor interrupt pending. | |
| hpmcounter3 | 0x0c03 | URO | hypervisor | Performance-monitoring counter. | |
| hpmcounter31 | 0x0c1f | URO | hypervisor | Performance-monitoring counter. | |
| hpmcounter31h | 0x0c9f | URO | hypervisor | Upper 32 bits of hpmcounter31, RV32I only. | |
| hpmcounter3h | 0x0c83 | URO | hypervisor | Upper 32 bits of hpmcounter3, RV32I only. | |
| hpmcounter4 | 0x0c04 | URO | hypervisor | Performance-monitoring counter. | |
| hpmcounter4h | 0x0c84 | URO | hypervisor | Upper 32 bits of hpmcounter4, RV32I only. | |
| hstatus | 0x0600 | HRW | hypervisor | Hypervisor status register. | |
| htimedelta | 0x0605 | HRW | hypervisor | Delta for VS/VU-mode timer. | |
| htimedeltah | 0x0615 | HRW | hypervisor | Upper 32 bits of htimedelta, RV32I only. | |
| htinst | 0x064a | HRW | hypervisor | Hypervisor trap instruction (transformed). | |
| htval | 0x0643 | HRW | hypervisor | Hypervisor bad guest physical address. | |
| instret | 0x0c02 | URO | hypervisor | Instructions-retired counter for RDINSTRET instruction. | |
| instreth | 0x0c82 | URO | machine | Upper 32 bits of instret, RV32I only. | |
| marchid | 0x0f12 | MRO | machine | Machine Architecture ID | |
| mbase | 0x0380 | MRW | Base register. | ||
| mbound | 0x0381 | MRW | Bound register. | ||
| mcause | 0x0342 | MRW | machine | Machine Exception Cause | |
| mcounteren | 0x0306 | MRW | machine | Counter Enable | |
| mcountinhibit | 0x0320 | MRW | machine | Machine Counter Inhibit | |
| mcycle | 0x0b00 | MRW | machine | Clock Cycles Executed Counter | |
| mcycleh | 0x0b80 | MRW | machine | Upper 32 bits of mcycle, RV32I only. | |
| mdbase | 0x0384 | MRW | Data base register. | ||
| mdbound | 0x0385 | MRW | Data bound register. | ||
| medeleg | 0x0302 | MRW | machine | Machine Exception Delegation | |
| mepc | 0x0341 | MRW | machine | Machine Exception Program Counter | |
| mhartid | 0x0f14 | MRO | machine | Hardware Thread ID | |
| mhpmcounter3 | 0x0b03 | MRW | machine | Event Counters | |
| mhpmcounter31 | 0x0b1f | MRW | machine | Machine performance-monitoring counter. | |
| mhpmcounter31h | 0x0b9f | MRW | machine | Upper 32 bits of mhpmcounter31, RV32I only. | |
| mhpmcounter3h | 0x0b83 | MRW | machine | Upper 32 bits of mhpmcounter3, RV32I only. | |
| mhpmcounter4 | 0x0b04 | MRW | machine | Machine performance-monitoring counter. | |
| mhpmcounter4h | 0x0b84 | MRW | machine | Upper 32 bits of mhpmcounter4, RV32I only. | |
| mhpmevent3 | 0x0323 | MRW | machine | Event Counter Event Select | |
| mhpmevent31 | 0x033f | MRW | machine | Machine performance-monitoring event selector. | |
| mhpmevent4 | 0x0324 | MRW | Machine performance-monitoring event selector. | ||
| mibase | 0x0382 | MRW | Instruction base register. | ||
| mibound | 0x0383 | MRW | Instruction bound register. | ||
| mideleg | 0x0303 | MRW | machine | Machine Interrupt Delegation | |
| mie | 0x0304 | MRW | machine | Machine Interrupt Enable | |
| mimpid | 0x0f13 | MRO | machine | Machine Implementation ID | |
| minstret | 0x0b02 | MRW | machine | Number of Instructions Retired Counter | |
| minstreth | 0x0b82 | MRW | machine | Upper 32 bits of minstret, RV32I only. | |
| mip | 0x0344 | MRW | machine | Machine Interrupt Pending | |
| misa | 0x0301 | MRW | machine | Machine ISA | |
| mscratch | 0x0340 | MRW | machine | Machine Mode Scratch Register | |
| mstatus | 0x0300 | MRW | machine | Machine Status | |
| mstatush | 0x0310 | MRW | hypervisor | Additional machine status register, RV32 only. | |
| mtime | MMIO | 64 | machine | Machine Timer | |
| mtimecmp | MMIO | 64 | machine | Machine Timer Compare | |
| mtinst | 0x034a | MRW | hypervisor | Machine trap instruction (transformed). | |
| mtval | 0x0343 | MRW | machine | Machine Trap Value | |
| mtval2 | 0x034b | MRW | hypervisor | Machine bad guest physical address. | |
| mtvec | 0x0305 | MRW | machine | Machine Trap Vector Base Address | |
| mvendorid | 0x0f11 | MRO | machine | Machine Vendor ID | |
| pmpaddr0 | 0x03b0 | MRW | machine | Physical memory protection address register. | |
| pmpaddr1 | 0x03b1 | MRW | machine | Physical memory protection address register. | |
| pmpaddr15 | 0x03bf | MRW | machine | Physical memory protection address register. | |
| pmpcfg0 | 0x03a0 | MRW | machine | Physical memory protection configuration. | |
| pmpcfg1 | 0x03a1 | MRW | machine | Physical memory protection configuration, RV32 only. | |
| pmpcfg2 | 0x03a2 | MRW | machine | Physical memory protection configuration. | |
| pmpcfg3 | 0x03a3 | MRW | machine | Physical memory protection configuration, RV32 only. | |
| satp | 0x0180 | SRW | supervisor | Supervisor address translation and protection. | |
| scause | 0x0142 | SRW | supervisor | Supervisor Exception Cause | |
| scounteren | 0x0106 | SRW | machine | Counter Enable | |
| sedeleg | 0x0102 | SRW | n | Supervisor Exception Delegation | |
| sepc | 0x0141 | SRW | supervisor | Supervisor Exception Program Counter | |
| sideleg | 0x0103 | SRW | n | Supervisor Interrupt Delegation | |
| sie | 0x0104 | SRW | supervisor | Supervisor Interrupt Enable | |
| sip | 0x0144 | SRW | supervisor | Supervisor Interrupt Pending | |
| sscratch | 0x0140 | SRW | machine | Supervisor Mode Scratch Register | |
| sstatus | 0x0100 | SRW | supervisor | Supervisor Status | |
| stval | 0x0143 | SRW | supervisor | Supervisor bad address or instruction. | |
| stvec | 0x0105 | SRW | supervisor | Supervisor Trap Vector Base Address | |
| tdata1 | 0x07a1 | MRW | debug | First Debug/Trace trigger data register. | |
| tdata2 | 0x07a2 | MRW | debug | Second Debug/Trace trigger data register. | |
| tdata3 | 0x07a3 | MRW | debug | Third Debug/Trace trigger data register. | |
| time | 0x0c01 | URO | hypervisor | Timer for RDTIME instruction. | |
| timeh | 0x0c81 | URO | machine | Upper 32 bits of time, RV32I only. | |
| tselect | 0x07a0 | MRW | Debug/Trace trigger register select. | ||
| ucause | 0x0042 | URW | n | User Exception Cause | |
| uepc | 0x0041 | URW | n | User Exception Program Counter | |
| uie | 0x0004 | URW | n | User Interrupt Enable | |
| uip | 0x0044 | URW | n | User Interrupt Pending | |
| uscratch | 0x0040 | URW | n | User Mode Scratch Register | |
| ustatus | 0x0000 | URW | n | User mode restricted view of mstatus | |
| utval | 0x0043 | URW | n | User Trap Value | |
| utvec | 0x0005 | URW | n | User Trap Vector Base Address | |
| vsatp | 0x0280 | HRW | hypervisor | Virtual supervisor address translation and protection. | |
| vscause | 0x0242 | HRW | hypervisor | Virtual supervisor trap cause. | |
| vsepc | 0x0241 | HRW | hypervisor | Virtual supervisor exception program counter. | |
| vsie | 0x0204 | HRW | hypervisor | Virtual supervisor interrupt-enable register. | |
| vsip | 0x0244 | HRW | hypervisor | Virtual supervisor interrupt pending. | |
| vsscratch | 0x0240 | HRW | hypervisor | Virtual supervisor scratch register. | |
| vsstatus | 0x0200 | HRW | hypervisor | Virtual supervisor status register. | |
| vstval | 0x0243 | HRW | hypervisor | Virtual supervisor bad address or instruction. | |
| vstvec | 0x0205 | HRW | hypervisor | Virtual supervisor trap handler base address. |