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Adding memory snooping for mmio accesses. Yuck.

This commit is contained in:
Ben Vanik 2014-05-27 19:33:16 -07:00
parent f289f90435
commit ca22010502
1 changed files with 82 additions and 6 deletions
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88
src/alloy/backend/x64/x64_sequences.cc
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@ -1498,6 +1498,86 @@ RegExp ComputeMemoryAddress(X64Emitter& e, const T& guest) {
return e.rdx + e.rax;
}
}
uint64_t DynamicRegisterLoad(void* raw_context, uint32_t address) {
auto thread_state = *((ThreadState**)raw_context);
auto cbs = thread_state->runtime()->access_callbacks();
while (cbs) {
if (cbs->handles(cbs->context, address)) {
return cbs->read(cbs->context, address);
}
cbs = cbs->next;
}
return 0;
}
void DynamicRegisterStore(void* raw_context, uint32_t address, uint64_t value) {
auto thread_state = *((ThreadState**)raw_context);
auto cbs = thread_state->runtime()->access_callbacks();
while (cbs) {
if (cbs->handles(cbs->context, address)) {
cbs->write(cbs->context, address, value);
return;
}
cbs = cbs->next;
}
}
template <typename DEST_REG>
void EmitLoadCheck(X64Emitter& e, const RegExp& addr, DEST_REG& dest) {
// rax = reserved
// if (address >> 24 == 0x7F) call register load handler;
e.lea(e.r8d, e.ptr[addr]);
e.shr(e.r8d, 24);
e.cmp(e.r8b, 0x7F);
e.inLocalLabel();
Xbyak::Label normal_addr;
Xbyak::Label skip_load;
e.jne(normal_addr);
e.lea(e.rdx, e.ptr[addr]);
e.CallNative(DynamicRegisterLoad);
if (DEST_REG::key_type == KEY_TYPE_V_I32) {
e.bswap(e.eax);
e.mov(dest, e.eax);
}
e.jmp(skip_load);
e.L(normal_addr);
if (DEST_REG::key_type == KEY_TYPE_V_I32) {
e.mov(dest, e.dword[addr]);
}
e.L(skip_load);
e.outLocalLabel();
}
template <typename SRC_REG>
void EmitStoreCheck(X64Emitter& e, const RegExp& addr, SRC_REG& src) {
// rax = reserved
// if (address >> 24 == 0x7F) call register store handler;
e.lea(e.r8d, e.ptr[addr]);
e.shr(e.r8d, 24);
e.cmp(e.r8b, 0x7F);
e.inLocalLabel();
Xbyak::Label normal_addr;
Xbyak::Label skip_load;
e.jne(normal_addr);
e.lea(e.rdx, e.ptr[addr]);
if (SRC_REG::key_type == KEY_TYPE_V_I32) {
if (src.is_constant) {
e.mov(e.r8d, XESWAP32(src.constant()));
} else {
e.mov(e.r8d, src);
e.bswap(e.r8d);
}
}
e.CallNative(DynamicRegisterStore);
e.jmp(skip_load);
e.L(normal_addr);
if (SRC_REG::key_type == KEY_TYPE_V_I32) {
if (src.is_constant) {
e.mov(e.dword[addr], src.constant());
} else {
e.mov(e.dword[addr], src);
}
}
e.L(skip_load);
e.outLocalLabel();
}
EMITTER(LOAD_I8, MATCH(I<OPCODE_LOAD, I8<>, I64<>>)) {
static void Emit(X64Emitter& e, const EmitArgType& i) {
if (CheckLoadAccessCallback(e, i)) {
@ -1532,7 +1612,7 @@ EMITTER(LOAD_I32, MATCH(I<OPCODE_LOAD, I32<>, I64<>>)) {
return;
}
auto addr = ComputeMemoryAddress(e, i.src1);
e.mov(i.dest, e.dword[addr]);
EmitLoadCheck(e, addr, i.dest);
if (IsTracingData()) {
e.mov(e.r8, i.dest);
e.lea(e.rdx, e.ptr[addr]);
@ -1685,11 +1765,7 @@ EMITTER(STORE_I32, MATCH(I<OPCODE_STORE, VoidOp, I64<>, I32<>>)) {
return;
}
auto addr = ComputeMemoryAddress(e, i.src1);
if (i.src2.is_constant) {
e.mov(e.dword[addr], i.src2.constant());
} else {
e.mov(e.dword[addr], i.src2);
}
EmitStoreCheck(e, addr, i.src2);
if (IsTracingData()) {
e.mov(e.r8, e.dword[addr]);
e.lea(e.rdx, e.ptr[addr]);