856a67ca3a
Stop emitting EBB relocations. Use the offsets computed by relax_branches() to encode the correct displacements immediately.
282 lines
8.3 KiB
Rust
282 lines
8.3 KiB
Rust
//! Emitting binary RISC-V machine code.
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use binemit::{CodeSink, Reloc, bad_encoding};
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use ir::{Function, Inst, InstructionData};
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use isa::RegUnit;
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use predicates::is_signed_int;
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include!(concat!(env!("OUT_DIR"), "/binemit-riscv.rs"));
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/// RISC-V relocation kinds.
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#[allow(dead_code)]
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pub enum RelocKind {
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/// A conditional (SB-type) branch to an EBB.
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Branch,
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}
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pub static RELOC_NAMES: [&'static str; 1] = ["Branch"];
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impl Into<Reloc> for RelocKind {
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fn into(self) -> Reloc {
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Reloc(self as u16)
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}
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}
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/// R-type instructions.
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///
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/// 31 24 19 14 11 6
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/// funct7 rs2 rs1 funct3 rd opcode
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/// 25 20 15 12 7 0
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///
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/// Encoding bits: `opcode[6:2] | (funct3 << 5) | (funct7 << 8)`.
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fn put_r<CS: CodeSink + ?Sized>(bits: u16,
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rs1: RegUnit,
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rs2: RegUnit,
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rd: RegUnit,
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sink: &mut CS) {
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let bits = bits as u32;
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let opcode5 = bits & 0x1f;
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let funct3 = (bits >> 5) & 0x7;
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let funct7 = (bits >> 8) & 0x7f;
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let rs1 = rs1 as u32 & 0x1f;
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let rs2 = rs2 as u32 & 0x1f;
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let rd = rd as u32 & 0x1f;
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// 0-6: opcode
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let mut i = 0x3;
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i |= opcode5 << 2;
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i |= rd << 7;
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i |= funct3 << 12;
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i |= rs1 << 15;
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i |= rs2 << 20;
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i |= funct7 << 25;
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sink.put4(i);
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}
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/// R-type instructions with a shift amount instead of rs2.
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///
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/// 31 25 19 14 11 6
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/// funct7 shamt rs1 funct3 rd opcode
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/// 25 20 15 12 7 0
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///
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/// Both funct7 and shamt contribute to bit 25. In RV64, shamt uses it for shifts > 31.
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///
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/// Encoding bits: `opcode[6:2] | (funct3 << 5) | (funct7 << 8)`.
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fn put_rshamt<CS: CodeSink + ?Sized>(bits: u16,
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rs1: RegUnit,
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shamt: i64,
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rd: RegUnit,
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sink: &mut CS) {
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let bits = bits as u32;
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let opcode5 = bits & 0x1f;
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let funct3 = (bits >> 5) & 0x7;
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let funct7 = (bits >> 8) & 0x7f;
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let rs1 = rs1 as u32 & 0x1f;
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let shamt = shamt as u32 & 0x3f;
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let rd = rd as u32 & 0x1f;
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// 0-6: opcode
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let mut i = 0x3;
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i |= opcode5 << 2;
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i |= rd << 7;
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i |= funct3 << 12;
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i |= rs1 << 15;
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i |= shamt << 20;
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i |= funct7 << 25;
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sink.put4(i);
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}
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fn recipe_r<CS: CodeSink + ?Sized>(func: &Function, inst: Inst, sink: &mut CS) {
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if let InstructionData::Binary { args, .. } = func.dfg[inst] {
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put_r(func.encodings[inst].bits(),
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func.locations[args[0]].unwrap_reg(),
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func.locations[args[1]].unwrap_reg(),
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func.locations[func.dfg.first_result(inst)].unwrap_reg(),
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sink);
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} else {
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panic!("Expected Binary format: {:?}", func.dfg[inst]);
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}
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}
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fn recipe_ricmp<CS: CodeSink + ?Sized>(func: &Function, inst: Inst, sink: &mut CS) {
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if let InstructionData::IntCompare { args, .. } = func.dfg[inst] {
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put_r(func.encodings[inst].bits(),
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func.locations[args[0]].unwrap_reg(),
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func.locations[args[1]].unwrap_reg(),
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func.locations[func.dfg.first_result(inst)].unwrap_reg(),
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sink);
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} else {
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panic!("Expected IntCompare format: {:?}", func.dfg[inst]);
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}
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}
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fn recipe_rshamt<CS: CodeSink + ?Sized>(func: &Function, inst: Inst, sink: &mut CS) {
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if let InstructionData::BinaryImm { arg, imm, .. } = func.dfg[inst] {
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put_rshamt(func.encodings[inst].bits(),
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func.locations[arg].unwrap_reg(),
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imm.into(),
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func.locations[func.dfg.first_result(inst)].unwrap_reg(),
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sink);
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} else {
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panic!("Expected BinaryImm format: {:?}", func.dfg[inst]);
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}
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}
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/// I-type instructions.
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///
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/// 31 19 14 11 6
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/// imm rs1 funct3 rd opcode
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/// 20 15 12 7 0
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///
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/// Encoding bits: `opcode[6:2] | (funct3 << 5)`
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fn put_i<CS: CodeSink + ?Sized>(bits: u16, rs1: RegUnit, imm: i64, rd: RegUnit, sink: &mut CS) {
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let bits = bits as u32;
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let opcode5 = bits & 0x1f;
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let funct3 = (bits >> 5) & 0x7;
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let rs1 = rs1 as u32 & 0x1f;
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let rd = rd as u32 & 0x1f;
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// 0-6: opcode
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let mut i = 0x3;
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i |= opcode5 << 2;
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i |= rd << 7;
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i |= funct3 << 12;
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i |= rs1 << 15;
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i |= (imm << 20) as u32;
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sink.put4(i);
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}
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fn recipe_i<CS: CodeSink + ?Sized>(func: &Function, inst: Inst, sink: &mut CS) {
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if let InstructionData::BinaryImm { arg, imm, .. } = func.dfg[inst] {
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put_i(func.encodings[inst].bits(),
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func.locations[arg].unwrap_reg(),
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imm.into(),
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func.locations[func.dfg.first_result(inst)].unwrap_reg(),
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sink);
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} else {
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panic!("Expected BinaryImm format: {:?}", func.dfg[inst]);
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}
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}
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fn recipe_iicmp<CS: CodeSink + ?Sized>(func: &Function, inst: Inst, sink: &mut CS) {
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if let InstructionData::IntCompareImm { arg, imm, .. } = func.dfg[inst] {
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put_i(func.encodings[inst].bits(),
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func.locations[arg].unwrap_reg(),
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imm.into(),
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func.locations[func.dfg.first_result(inst)].unwrap_reg(),
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sink);
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} else {
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panic!("Expected IntCompareImm format: {:?}", func.dfg[inst]);
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}
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}
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fn recipe_iret<CS: CodeSink + ?Sized>(_func: &Function, _inst: Inst, _sink: &mut CS) {
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unimplemented!()
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}
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/// U-type instructions.
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///
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/// 31 11 6
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/// imm rd opcode
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/// 12 7 0
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///
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/// Encoding bits: `opcode[6:2] | (funct3 << 5)`
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fn put_u<CS: CodeSink + ?Sized>(bits: u16, imm: i64, rd: RegUnit, sink: &mut CS) {
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let bits = bits as u32;
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let opcode5 = bits & 0x1f;
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let rd = rd as u32 & 0x1f;
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// 0-6: opcode
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let mut i = 0x3;
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i |= opcode5 << 2;
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i |= rd << 7;
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i |= imm as u32 & 0xfffff000;
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sink.put4(i);
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}
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fn recipe_u<CS: CodeSink + ?Sized>(func: &Function, inst: Inst, sink: &mut CS) {
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if let InstructionData::UnaryImm { imm, .. } = func.dfg[inst] {
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put_u(func.encodings[inst].bits(),
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imm.into(),
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func.locations[func.dfg.first_result(inst)].unwrap_reg(),
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sink);
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} else {
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panic!("Expected UnaryImm format: {:?}", func.dfg[inst]);
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}
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}
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/// SB-type branch instructions.
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///
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/// 31 24 19 14 11 6
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/// imm rs2 rs1 funct3 imm opcode
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/// 25 20 15 12 7 0
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///
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/// Encoding bits: `opcode[6:2] | (funct3 << 5)`
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fn put_sb<CS: CodeSink + ?Sized>(bits: u16, imm: i64, rs1: RegUnit, rs2: RegUnit, sink: &mut CS) {
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let bits = bits as u32;
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let opcode5 = bits & 0x1f;
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let funct3 = (bits >> 5) & 0x7;
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let rs1 = rs1 as u32 & 0x1f;
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let rs2 = rs2 as u32 & 0x1f;
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assert!(is_signed_int(imm, 13, 1), "SB out of range {:#x}", imm);
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let imm = imm as u32;
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// 0-6: opcode
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let mut i = 0x3;
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i |= opcode5 << 2;
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i |= funct3 << 12;
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i |= rs1 << 15;
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i |= rs2 << 20;
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// The displacement is completely hashed up.
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i |= ((imm >> 11) & 0x1) << 7;
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i |= ((imm >> 1) & 0xf) << 8;
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i |= ((imm >> 5) & 0x3f) << 25;
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i |= ((imm >> 12) & 0x1) << 31;
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sink.put4(i);
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}
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fn recipe_sb<CS: CodeSink + ?Sized>(func: &Function, inst: Inst, sink: &mut CS) {
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if let InstructionData::BranchIcmp {
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destination,
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ref args,
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..
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} = func.dfg[inst] {
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let dest = func.offsets[destination] as i64;
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let disp = dest - sink.offset() as i64;
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let args = &args.as_slice(&func.dfg.value_lists)[0..2];
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put_sb(func.encodings[inst].bits(),
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disp,
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func.locations[args[0]].unwrap_reg(),
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func.locations[args[1]].unwrap_reg(),
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sink);
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} else {
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panic!("Expected BranchIcmp format: {:?}", func.dfg[inst]);
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}
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}
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fn recipe_sbzero<CS: CodeSink + ?Sized>(func: &Function, inst: Inst, sink: &mut CS) {
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if let InstructionData::Branch {
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destination,
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ref args,
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..
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} = func.dfg[inst] {
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let dest = func.offsets[destination] as i64;
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let disp = dest - sink.offset() as i64;
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let args = &args.as_slice(&func.dfg.value_lists)[0..1];
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put_sb(func.encodings[inst].bits(),
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disp,
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func.locations[args[0]].unwrap_reg(),
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0,
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sink);
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} else {
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panic!("Expected Branch format: {:?}", func.dfg[inst]);
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}
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}
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