mirror of
https://github.com/Whispergate/JanusLoader
synced 2026-07-22 11:23:12 +00:00
hunterino-sec
39 lines
1.6 KiB
C++
39 lines
1.6 KiB
C++
#pragma once
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#include <cstdint>
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// Field extractors — no bit-twiddling at call sites
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inline int rv_rd (uint32_t i) { return (i >> 7) & 0x1F; }
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inline int rv_rs1(uint32_t i) { return (i >> 15) & 0x1F; }
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inline int rv_rs2(uint32_t i) { return (i >> 20) & 0x1F; }
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inline int rv_f3 (uint32_t i) { return (i >> 12) & 0x7; }
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inline int rv_f7 (uint32_t i) { return (i >> 25) & 0x7F; }
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inline int rv_op (uint32_t i) { return (i >> 2) & 0x1F; }
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// Sign-extended immediates
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inline int64_t rv_imm_i(uint32_t i) {
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return (int64_t)(int32_t)i >> 20;
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}
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inline int64_t rv_imm_u(uint32_t i) {
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return (int64_t)(int32_t)(i & 0xFFFFF000u);
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}
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inline int64_t rv_imm_s(uint32_t i) {
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// imm[11:5] at bits 31:25, imm[4:0] at bits 11:7
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return ((int64_t)(int32_t)i >> 20 & ~(int64_t)0x1F) | ((i >> 7) & 0x1F);
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}
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inline int64_t rv_imm_b(uint32_t i) {
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// {imm[12], imm[11], imm[10:5], imm[4:1], 0}
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uint32_t raw = ((i >> 19) & 0x1000u) // bit 31 → bit 12
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| ((i << 4) & 0x0800u) // bit 7 → bit 11
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| ((i >> 20) & 0x07E0u) // bits 30:25 → bits 10:5
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| ((i >> 7) & 0x001Eu); // bits 11:8 → bits 4:1
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return (int64_t)(int32_t)(raw << 19) >> 19; // sign-extend from bit 12
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}
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inline int64_t rv_imm_j(uint32_t i) {
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// {imm[20], imm[19:12], imm[11], imm[10:1], 0}
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uint32_t raw = ((i >> 11) & 0x100000u) // bit 31 → bit 20
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| (i & 0x0FF000u) // bits 19:12 stay
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| ((i >> 9) & 0x000800u) // bit 20 → bit 11
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| ((i >> 20) & 0x0007FEu); // bits 30:21 → bits 10:1
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return (int64_t)(int32_t)(raw << 11) >> 11; // sign-extend from bit 20
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}
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