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backend/rv64: Initial implementation of terminals

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This commit is contained in:
Yang Liu 2024-01-24 15:15:32 +08:00 committed by Merry
parent 672d43fbb7
commit 1de237bf24
4 changed files with 227 additions and 22 deletions
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13
src/dynarmic/backend/riscv64/a32_address_space.cpp
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@ -82,9 +82,9 @@ void A32AddressSpace::EmitPrelude() {
as.FSD(FPR{i}, (32 + i) * 8 + static_cast<int32_t>(sizeof(StackLayout)), sp);
}
as.ADDI(Xstate, a1, 0);
as.ADDI(Xhalt, a2, 0);
as.JALR(x0, 0, a0);
as.MV(Xstate, a1);
as.MV(Xhalt, a2);
as.JR(a0);
prelude_info.return_from_run_code = GetCursorPtr<CodePtr>();
for (u32 i = 1; i < 32; i += 1) {
@ -116,7 +116,10 @@ EmittedBlockInfo A32AddressSpace::Emit(IR::Block block) {
ClearCache();
}
EmittedBlockInfo block_info = EmitRV64(as, std::move(block), {});
EmittedBlockInfo block_info = EmitRV64(as, std::move(block), {
.enable_cycle_counting = conf.enable_cycle_counting,
.always_little_endian = conf.always_little_endian,
});
Link(block_info);
return block_info;
@ -130,7 +133,7 @@ void A32AddressSpace::Link(EmittedBlockInfo& block_info) {
switch (target) {
case LinkTarget::ReturnFromRunCode: {
std::ptrdiff_t off = prelude_info.return_from_run_code - reinterpret_cast<CodePtr>(a.GetCursorPointer());
a.JAL(x0, off);
a.J(off);
break;
}
default:

30
src/dynarmic/backend/riscv64/emit_riscv64.cpp
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@ -54,7 +54,7 @@ void EmitIR<IR::Opcode::GetNZFromOp>(biscuit::Assembler& as, EmitContext& ctx, I
as.SEQZ(Xnz, Xvalue);
as.SLLI(Xnz, Xnz, 30);
as.SLT(Xscratch0, Xvalue, biscuit::zero);
as.SLTZ(Xscratch0, Xvalue);
as.SLLI(Xscratch0, Xscratch0, 31);
as.OR(Xnz, Xnz, Xscratch0);
}
@ -98,21 +98,27 @@ EmittedBlockInfo EmitRV64(biscuit::Assembler& as, IR::Block block, const EmitCon
reg_alloc.UpdateAllUses();
reg_alloc.AssertNoMoreUses();
// TODO: Add Cycles
if (emit_conf.enable_cycle_counting) {
const size_t cycles_to_add = block.CycleCount();
as.LD(Xscratch0, offsetof(StackLayout, cycles_remaining), sp);
if (mcl::bit::sign_extend<12>(-cycles_to_add) == -cycles_to_add) {
as.ADDI(Xscratch0, Xscratch0, -cycles_to_add);
} else {
as.LI(Xscratch1, cycles_to_add);
as.SUB(Xscratch0, Xscratch0, Xscratch1);
}
as.SD(Xscratch0, offsetof(StackLayout, cycles_remaining), sp);
}
// TODO: Emit Terminal
const auto term = block.GetTerminal();
const IR::Term::LinkBlock* link_block_term = boost::get<IR::Term::LinkBlock>(&term);
ASSERT(link_block_term);
as.LI(Xscratch0, link_block_term->next.Value());
as.SD(Xscratch0, offsetof(A32JitState, regs) + sizeof(u32) * 15, Xstate);
ptrdiff_t offset = reinterpret_cast<CodePtr>(as.GetCursorPointer()) - ebi.entry_point;
ebi.relocations.emplace_back(Relocation{offset, LinkTarget::ReturnFromRunCode});
as.NOP();
EmitA32Terminal(as, ctx);
ebi.size = reinterpret_cast<CodePtr>(as.GetCursorPointer()) - ebi.entry_point;
return ebi;
}
void EmitRelocation(biscuit::Assembler& as, EmitContext& ctx, LinkTarget link_target) {
ctx.ebi.relocations.emplace_back(Relocation{reinterpret_cast<CodePtr>(as.GetCursorPointer()) - ctx.ebi.entry_point, link_target});
as.NOP();
}
} // namespace Dynarmic::Backend::RV64

18
src/dynarmic/backend/riscv64/emit_riscv64.h
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@ -7,6 +7,7 @@
#include <vector>
#include <biscuit/label.hpp>
#include <mcl/stdint.hpp>
namespace biscuit {
@ -15,8 +16,9 @@ class Assembler;
namespace Dynarmic::IR {
class Block;
enum class Opcode;
class Inst;
enum class Cond;
enum class Opcode;
} // namespace Dynarmic::IR
namespace Dynarmic::Backend::RV64 {
@ -38,13 +40,19 @@ struct EmittedBlockInfo {
std::vector<Relocation> relocations;
};
struct EmitConfig {};
struct EmitConfig {
bool enable_cycle_counting;
bool always_little_endian;
};
struct EmitContext;
template<IR::Opcode op>
void EmitIR(biscuit::Assembler& as, EmitContext& ctx, IR::Inst* inst);
EmittedBlockInfo EmitRV64(biscuit::Assembler& as, IR::Block block, const EmitConfig& emit_conf);
template<IR::Opcode op>
void EmitIR(biscuit::Assembler& as, EmitContext& ctx, IR::Inst* inst);
void EmitRelocation(biscuit::Assembler& as, EmitContext& ctx, LinkTarget link_target);
void EmitA32Cond(biscuit::Assembler& as, EmitContext& ctx, IR::Cond cond, biscuit::Label* label);
void EmitA32Terminal(biscuit::Assembler& as, EmitContext& ctx);
} // namespace Dynarmic::Backend::RV64

188
src/dynarmic/backend/riscv64/emit_riscv64_a32.cpp
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@ -17,6 +17,194 @@
namespace Dynarmic::Backend::RV64 {
void EmitA32Cond(biscuit::Assembler& as, EmitContext&, IR::Cond cond, biscuit::Label* label) {
as.LWU(Xscratch0, offsetof(A32JitState, cpsr_nzcv), Xstate);
as.SRLIW(Xscratch0, Xscratch0, 28);
switch (cond) {
case IR::Cond::EQ:
// Z == 1
as.ANDI(Xscratch0, Xscratch0, 0b0100);
as.BNEZ(Xscratch0, label);
break;
case IR::Cond::NE:
// Z = 0
as.ANDI(Xscratch0, Xscratch0, 0b0100);
as.BEQZ(Xscratch0, label);
break;
case IR::Cond::CS:
// C == 1
as.ANDI(Xscratch0, Xscratch0, 0b0010);
as.BNEZ(Xscratch0, label);
break;
case IR::Cond::CC:
// C == 0
as.ANDI(Xscratch0, Xscratch0, 0b0010);
as.BEQZ(Xscratch0, label);
break;
case IR::Cond::MI:
// N == 1
as.ANDI(Xscratch0, Xscratch0, 0b1000);
as.BNEZ(Xscratch0, label);
break;
case IR::Cond::PL:
// N == 0
as.ANDI(Xscratch0, Xscratch0, 0b1000);
as.BEQZ(Xscratch0, label);
break;
case IR::Cond::VS:
// V == 1
as.ANDI(Xscratch0, Xscratch0, 0b0001);
as.BNEZ(Xscratch0, label);
break;
case IR::Cond::VC:
// V == 0
as.ANDI(Xscratch0, Xscratch0, 0b0001);
as.BEQZ(Xscratch0, label);
break;
case IR::Cond::HI:
// Z == 0 && C == 1
as.ANDI(Xscratch0, Xscratch0, 0b0110);
as.ADDI(Xscratch1, biscuit::zero, 0b0010);
as.BEQ(Xscratch0, Xscratch1, label);
break;
case IR::Cond::LS:
// Z == 1 || C == 0
as.ANDI(Xscratch0, Xscratch0, 0b0110);
as.ADDI(Xscratch1, biscuit::zero, 0b0010);
as.BNE(Xscratch0, Xscratch1, label);
break;
case IR::Cond::GE:
// N == V
as.ANDI(Xscratch0, Xscratch0, 0b1001);
as.ADDI(Xscratch1, biscuit::zero, 0b1001);
as.BEQ(Xscratch0, Xscratch1, label);
as.BEQZ(Xscratch0, label);
break;
case IR::Cond::LT:
// N != V
as.ANDI(Xscratch0, Xscratch0, 0b1001);
as.ADDI(Xscratch1, biscuit::zero, 0b1000);
as.BEQ(Xscratch0, Xscratch1, label);
as.ADDI(Xscratch1, biscuit::zero, 0b0001);
as.BEQ(Xscratch0, Xscratch1, label);
break;
case IR::Cond::GT:
// Z == 0 && N == V
as.ANDI(Xscratch0, Xscratch0, 0b1101);
as.ADDI(Xscratch1, biscuit::zero, 0b1001);
as.BEQ(Xscratch0, Xscratch1, label);
as.BEQZ(Xscratch0, label);
break;
case IR::Cond::LE:
// Z == 1 || N != V
as.ANDI(Xscratch0, Xscratch0, 0b1101);
as.LI(Xscratch1, 0b11000100110010);
as.SRLW(Xscratch0, Xscratch1, Xscratch0);
as.ANDI(Xscratch0, Xscratch0, 1);
as.BNEZ(Xscratch0, label);
break;
default:
ASSERT_MSG(false, "Unknown cond {}", static_cast<size_t>(cond));
break;
}
}
void EmitA32Terminal(biscuit::Assembler& as, EmitContext& ctx, IR::Term::Terminal terminal, IR::LocationDescriptor initial_location, bool is_single_step);
void EmitA32Terminal(biscuit::Assembler&, EmitContext&, IR::Term::Interpret, IR::LocationDescriptor, bool) {
ASSERT_FALSE("Interpret should never be emitted.");
}
void EmitA32Terminal(biscuit::Assembler& as, EmitContext& ctx, IR::Term::ReturnToDispatch, IR::LocationDescriptor, bool) {
EmitRelocation(as, ctx, LinkTarget::ReturnFromRunCode);
}
void EmitSetUpperLocationDescriptor(biscuit::Assembler& as, EmitContext& ctx, IR::LocationDescriptor new_location, IR::LocationDescriptor old_location) {
auto get_upper = [](const IR::LocationDescriptor& desc) -> u32 {
return static_cast<u32>(A32::LocationDescriptor{desc}.SetSingleStepping(false).UniqueHash() >> 32);
};
const u32 old_upper = get_upper(old_location);
const u32 new_upper = [&] {
const u32 mask = ~u32(ctx.emit_conf.always_little_endian ? 0x2 : 0);
return get_upper(new_location) & mask;
}();
if (old_upper != new_upper) {
as.LI(Xscratch0, new_upper);
as.SW(Xscratch0, offsetof(A32JitState, upper_location_descriptor), Xstate);
}
}
void EmitA32Terminal(biscuit::Assembler& as, EmitContext& ctx, IR::Term::LinkBlock terminal, IR::LocationDescriptor initial_location, bool) {
EmitSetUpperLocationDescriptor(as, ctx, terminal.next, initial_location);
as.LI(Xscratch0, terminal.next.Value());
as.SW(Xscratch0, offsetof(A32JitState, regs) + sizeof(u32) * 15, Xstate);
EmitRelocation(as, ctx, LinkTarget::ReturnFromRunCode);
// TODO: Implement LinkBlock optimization
}
void EmitA32Terminal(biscuit::Assembler& as, EmitContext& ctx, IR::Term::LinkBlockFast terminal, IR::LocationDescriptor initial_location, bool) {
EmitSetUpperLocationDescriptor(as, ctx, terminal.next, initial_location);
as.LI(Xscratch0, terminal.next.Value());
as.SW(Xscratch0, offsetof(A32JitState, regs) + sizeof(u32) * 15, Xstate);
EmitRelocation(as, ctx, LinkTarget::ReturnFromRunCode);
// TODO: Implement LinkBlockFast optimization
}
void EmitA32Terminal(biscuit::Assembler& as, EmitContext& ctx, IR::Term::PopRSBHint, IR::LocationDescriptor, bool) {
EmitRelocation(as, ctx, LinkTarget::ReturnFromRunCode);
// TODO: Implement PopRSBHint optimization
}
void EmitA32Terminal(biscuit::Assembler& as, EmitContext& ctx, IR::Term::FastDispatchHint, IR::LocationDescriptor, bool) {
EmitRelocation(as, ctx, LinkTarget::ReturnFromRunCode);
// TODO: Implement FastDispatchHint optimization
}
void EmitA32Terminal(biscuit::Assembler& as, EmitContext& ctx, IR::Term::If terminal, IR::LocationDescriptor initial_location, bool is_single_step) {
biscuit::Label pass;
EmitA32Cond(as, ctx, terminal.if_, &pass);
EmitA32Terminal(as, ctx, terminal.else_, initial_location, is_single_step);
as.Bind(&pass);
EmitA32Terminal(as, ctx, terminal.then_, initial_location, is_single_step);
}
void EmitA32Terminal(biscuit::Assembler& as, EmitContext& ctx, IR::Term::CheckBit terminal, IR::LocationDescriptor initial_location, bool is_single_step) {
biscuit::Label fail;
as.LBU(Xscratch0, offsetof(StackLayout, check_bit), Xstate);
as.BEQZ(Xscratch0, &fail);
EmitA32Terminal(as, ctx, terminal.then_, initial_location, is_single_step);
as.Bind(&fail);
EmitA32Terminal(as, ctx, terminal.else_, initial_location, is_single_step);
}
void EmitA32Terminal(biscuit::Assembler& as, EmitContext& ctx, IR::Term::CheckHalt terminal, IR::LocationDescriptor initial_location, bool is_single_step) {
biscuit::Label fail;
as.LWU(Xscratch0, 0, Xhalt);
as.FENCE(biscuit::FenceOrder::RW, biscuit::FenceOrder::RW);
as.BNEZ(Xscratch0, &fail);
EmitA32Terminal(as, ctx, terminal.else_, initial_location, is_single_step);
as.Bind(&fail);
EmitRelocation(as, ctx, LinkTarget::ReturnFromRunCode);
}
void EmitA32Terminal(biscuit::Assembler& as, EmitContext& ctx, IR::Term::Terminal terminal, IR::LocationDescriptor initial_location, bool is_single_step) {
boost::apply_visitor([&](const auto& t) { EmitA32Terminal(as, ctx, t, initial_location, is_single_step); }, terminal);
}
void EmitA32Terminal(biscuit::Assembler& as, EmitContext& ctx) {
const A32::LocationDescriptor location{ctx.block.Location()};
EmitA32Terminal(as, ctx, ctx.block.GetTerminal(), location.SetSingleStepping(false), location.SingleStepping());
}
template<>
void EmitIR<IR::Opcode::A32GetRegister>(biscuit::Assembler& as, EmitContext& ctx, IR::Inst* inst) {
const A32::Reg reg = inst->GetArg(0).GetA32RegRef();