Comments (4)
Check the following materials in advance:
- PicoRV32:
ENABLE_COUNTERS64
(default = 1)
This parameter enables support for the RDCYCLEH, RDTIMEH, and RDINSTRETH instructions. If this parameter is set to 0, and ENABLE_COUNTERS is set to 1, then only the RDCYCLE, RDTIME, and RDINSTRET instructions are available. - Mike Field's emulate-risc-v
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fastrv32 is another reference for implementing timer stuff.
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Writing my first assembly code.
Alternatively, you can check riscv-csr-access for inline assembly based routines.
from rv32emu.
Suppose that we are going to utilize a function getcycles
:
uint64_t getcycles();
It can be implemented:
.text
.globl getcycles
.align 2
getcycles:
csrr a1, mcycleh
csrr a0, mcycle
csrr a2, mcycleh
bne a1, a2, getcycles
ret
.size getcycles,.-getcycles
Similarly, function getinstret
can be implemented as following:
.text
.globl getinstret
.align 2
getinstret:
csrr a1, minstreth
csrr a0, minstret
csrr a2, minstreth
bne a1, a2, getinstret
ret
.size getinstret,.-getinstret
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Related Issues (20)
- CI: Generate Docker image with commit SHA1 HOT 2
- Compare with libriscv HOT 1
- Fix potential security issue in benchmark script
- jit: code generation tool should be aware of comments
- jit: Incomplete `muldivmod`
- Evaluate a hybrid approach for macro-operation fusion in both the decoding and execution stages
- Consolidate public header by integrating src/state.h HOT 1
- jit: Several errors are detected when running CoreMark
- Refactoring RISC-V emulation APIs for easier adoption and porting HOT 33
- jit: Enhance security by Control-Flow Integrity
- Comparing Interpreter performance with Wasm3
- Incorrect global/static float array initialization HOT 2
- Fail to build when ENABLE_EXT_C=0 ENABLE_JIT=1 HOT 1
- Accelerate ISA simulation by tiered JIT compilation HOT 14
- Assertion fail when running jit-bf with ENABLE_JIT=1
- jit: Implement register allocation for T1C HOT 2
- Provide minimal cross-platform GUI library HOT 2
- Incorrect basename generated by dynamic profiler
- jit: Assertion while running aes.elf HOT 2
- Potential uninitialized value read without initialization HOT 2
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