mirror of
https://github.com/Whispergate/JanusLoader
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hunterino-sec
37 lines
1.1 KiB
C++
37 lines
1.1 KiB
C++
#pragma once
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#include <cstdint>
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#include <cstddef>
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#include "syscall.hpp"
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// RISC-V ABI register indices
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enum : int {
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RV_ZERO=0, RV_RA=1, RV_SP=2, RV_GP=3, RV_TP=4,
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RV_T0=5, RV_T1=6, RV_T2=7,
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RV_S0=8, RV_FP=8, RV_S1=9,
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RV_A0=10, RV_A1=11, RV_A2=12, RV_A3=13,
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RV_A4=14, RV_A5=15, RV_A6=16, RV_A7=17,
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RV_S2=18, RV_S3=19, RV_S4=20, RV_S5=21,
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RV_S6=22, RV_S7=23, RV_S8=24, RV_S9=25,
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RV_S10=26, RV_S11=27,
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RV_T3=28, RV_T4=29, RV_T5=30, RV_T6=31,
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};
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struct RiscVm {
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int64_t regs[32]; // x0 hardwired 0
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uint64_t pc;
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uint8_t* mem_base; // flat allocation; guest addrs == host addrs
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size_t mem_size;
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SyscallTable* syscalls; // swappable
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bool halted;
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};
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// Helpers
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inline void rv_wreg(RiscVm* vm, int rd, int64_t v) { if (rd) vm->regs[rd] = v; }
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inline void rv_adv (RiscVm* vm) { vm->pc += 4; }
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inline uint32_t rv_fetch(const RiscVm* vm) {
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return *reinterpret_cast<const uint32_t*>(static_cast<uintptr_t>(vm->pc));
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}
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void riscvm_init(RiscVm* vm, uint8_t* mem, size_t mem_sz, SyscallTable* sc);
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void riscvm_run (RiscVm* vm);
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