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a64/fastmem: Only generate abort handler if needed.

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If fastmem fails, we call the callback from the signal handler. So this callback proxy in slowmem won't be used ever.
This commit is contained in:
Markus Wick 2021-05-27 21:49:08 +02:00 committed by merry
parent b4ee976a6f
commit ff01b1c6f9
1 changed files with 23 additions and 13 deletions
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36
src/dynarmic/backend/x64/a64_emit_x64.cpp
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@ -880,7 +880,7 @@ Xbyak::RegExp EmitVAddrLookup(BlockOfCode& code, A64EmitContext& ctx, size_t bit
return page + tmp;
}
Xbyak::RegExp EmitFastmemVAddr(BlockOfCode& code, A64EmitContext& ctx, Xbyak::Label& abort, Xbyak::Reg64 vaddr) {
Xbyak::RegExp EmitFastmemVAddr(BlockOfCode& code, A64EmitContext& ctx, Xbyak::Label& abort, Xbyak::Reg64 vaddr, bool& require_abort_handling) {
const size_t unused_top_bits = 64 - ctx.conf.page_table_address_space_bits;
if (unused_top_bits == 0) {
@ -902,12 +902,14 @@ Xbyak::RegExp EmitFastmemVAddr(BlockOfCode& code, A64EmitContext& ctx, Xbyak::La
if (ctx.conf.page_table_address_space_bits < 32) {
code.test(vaddr, u32(-(1 << ctx.conf.page_table_address_space_bits)));
code.jnz(abort, code.T_NEAR);
require_abort_handling = true;
} else {
// TODO: Consider having TEST as above but coalesce 64-bit constant in register allocator
Xbyak::Reg64 tmp = ctx.reg_alloc.ScratchGpr();
code.mov(tmp, vaddr);
code.shr(tmp, int(ctx.conf.page_table_address_space_bits));
code.jnz(abort, code.T_NEAR);
require_abort_handling = true;
}
return r13 + vaddr;
}
@ -973,10 +975,11 @@ void A64EmitX64::EmitMemoryRead(A64EmitContext& ctx, IR::Inst* inst) {
const auto wrapped_fn = read_fallbacks[std::make_tuple(bitsize, vaddr.getIdx(), value.getIdx())];
Xbyak::Label abort, end;
bool require_abort_handling = false;
if (fastmem_marker) {
// Use fastmem
const auto src_ptr = EmitFastmemVAddr(code, ctx, abort, vaddr);
const auto src_ptr = EmitFastmemVAddr(code, ctx, abort, vaddr, require_abort_handling);
const auto location = code.getCurr();
EmitReadMemoryMov<bitsize>(code, value, src_ptr);
@ -993,15 +996,18 @@ void A64EmitX64::EmitMemoryRead(A64EmitContext& ctx, IR::Inst* inst) {
// Use page table
ASSERT(conf.page_table);
const auto src_ptr = EmitVAddrLookup(code, ctx, bitsize, abort, vaddr);
require_abort_handling = true;
EmitReadMemoryMov<bitsize>(code, value, src_ptr);
}
code.L(end);
code.SwitchToFarCode();
code.L(abort);
code.call(wrapped_fn);
code.jmp(end, code.T_NEAR);
code.SwitchToNearCode();
if (require_abort_handling) {
code.SwitchToFarCode();
code.L(abort);
code.call(wrapped_fn);
code.jmp(end, code.T_NEAR);
code.SwitchToNearCode();
}
ctx.reg_alloc.DefineValue(inst, value);
}
@ -1024,10 +1030,11 @@ void A64EmitX64::EmitMemoryWrite(A64EmitContext& ctx, IR::Inst* inst) {
const auto wrapped_fn = write_fallbacks[std::make_tuple(bitsize, vaddr.getIdx(), value.getIdx())];
Xbyak::Label abort, end;
bool require_abort_handling = false;
if (fastmem_marker) {
// Use fastmem
const auto dest_ptr = EmitFastmemVAddr(code, ctx, abort, vaddr);
const auto dest_ptr = EmitFastmemVAddr(code, ctx, abort, vaddr, require_abort_handling);
const auto location = code.getCurr();
EmitWriteMemoryMov<bitsize>(code, dest_ptr, value);
@ -1044,15 +1051,18 @@ void A64EmitX64::EmitMemoryWrite(A64EmitContext& ctx, IR::Inst* inst) {
// Use page table
ASSERT(conf.page_table);
const auto dest_ptr = EmitVAddrLookup(code, ctx, bitsize, abort, vaddr);
require_abort_handling = true;
EmitWriteMemoryMov<bitsize>(code, dest_ptr, value);
}
code.L(end);
code.SwitchToFarCode();
code.L(abort);
code.call(wrapped_fn);
code.jmp(end, code.T_NEAR);
code.SwitchToNearCode();
if (require_abort_handling) {
code.SwitchToFarCode();
code.L(abort);
code.call(wrapped_fn);
code.jmp(end, code.T_NEAR);
code.SwitchToNearCode();
}
}
void A64EmitX64::EmitA64ReadMemory8(A64EmitContext& ctx, IR::Inst* inst) {