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Core/MMU: Add HostTryRead*() functions.

This commit is contained in:
Admiral H. Curtiss 2021-02-27 14:06:59 +01:00
parent 954f27c5d7
commit b59fcae70a
2 changed files with 218 additions and 11 deletions
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154
Source/Core/Core/PowerPC/MMU.cpp
View File

@ -3,6 +3,7 @@
#include "Core/PowerPC/MMU.h"
#include <cassert>
#include <cstddef>
#include <cstring>
#include <string>
@ -427,6 +428,36 @@ u32 HostRead_Instruction(const u32 address)
return ReadFromHardware<XCheckTLBFlag::OpcodeNoException, u32>(address);
}
TryReadResult<u32> HostTryReadInstruction(const u32 address, RequestedAddressSpace space)
{
if (!HostIsInstructionRAMAddress(address, space))
return TryReadResult<u32>();
switch (space)
{
case RequestedAddressSpace::Effective:
{
const u32 value = ReadFromHardware<XCheckTLBFlag::OpcodeNoException, u32>(address);
return TryReadResult<u32>(!!MSR.DR, value);
}
case RequestedAddressSpace::Physical:
{
const u32 value = ReadFromHardware<XCheckTLBFlag::OpcodeNoException, u32, true>(address);
return TryReadResult<u32>(false, value);
}
case RequestedAddressSpace::Virtual:
{
if (!MSR.DR)
return TryReadResult<u32>();
const u32 value = ReadFromHardware<XCheckTLBFlag::OpcodeNoException, u32>(address);
return TryReadResult<u32>(true, value);
}
}
assert(0);
return TryReadResult<u32>();
}
static void Memcheck(u32 address, u32 var, bool write, size_t size)
{
if (PowerPC::memchecks.HasAny())
@ -499,6 +530,73 @@ float Read_F32(const u32 address)
return Common::BitCast<float>(integral);
}
template <typename T>
static TryReadResult<T> HostTryReadUX(const u32 address, RequestedAddressSpace space)
{
if (!HostIsRAMAddress(address, space))
return TryReadResult<T>();
switch (space)
{
case RequestedAddressSpace::Effective:
{
T value = ReadFromHardware<XCheckTLBFlag::NoException, T>(address);
return TryReadResult<T>(!!MSR.DR, std::move(value));
}
case RequestedAddressSpace::Physical:
{
T value = ReadFromHardware<XCheckTLBFlag::NoException, T, true>(address);
return TryReadResult<T>(false, std::move(value));
}
case RequestedAddressSpace::Virtual:
{
if (!MSR.DR)
return TryReadResult<T>();
T value = ReadFromHardware<XCheckTLBFlag::NoException, T>(address);
return TryReadResult<T>(true, std::move(value));
}
}
assert(0);
return TryReadResult<T>();
}
TryReadResult<u8> HostTryReadU8(u32 address, RequestedAddressSpace space)
{
return HostTryReadUX<u8>(address, space);
}
TryReadResult<u16> HostTryReadU16(u32 address, RequestedAddressSpace space)
{
return HostTryReadUX<u16>(address, space);
}
TryReadResult<u32> HostTryReadU32(u32 address, RequestedAddressSpace space)
{
return HostTryReadUX<u32>(address, space);
}
TryReadResult<u64> HostTryReadU64(u32 address, RequestedAddressSpace space)
{
return HostTryReadUX<u64>(address, space);
}
TryReadResult<float> HostTryReadF32(u32 address, RequestedAddressSpace space)
{
const auto result = HostTryReadUX<u32>(address, space);
if (!result)
return TryReadResult<float>();
return TryReadResult<float>(result.translated, Common::BitCast<float>(result.value));
}
TryReadResult<double> HostTryReadF64(u32 address, RequestedAddressSpace space)
{
const auto result = HostTryReadUX<u64>(address, space);
if (!result)
return TryReadResult<double>();
return TryReadResult<double>(result.translated, Common::BitCast<double>(result.value));
}
u32 Read_U8_ZX(const u32 address)
{
return Read_U8(address);
@ -639,6 +737,27 @@ std::string HostGetString(u32 address, size_t size)
return s;
}
TryReadResult<std::string> HostTryReadString(u32 address, size_t size, RequestedAddressSpace space)
{
auto c = HostTryReadU8(address, space);
if (!c)
return TryReadResult<std::string>();
if (c.value == 0)
return TryReadResult<std::string>(c.translated, "");
std::string s;
s += static_cast<char>(c.value);
while (size == 0 || s.length() < size)
{
++address;
const auto res = HostTryReadU8(address, space);
if (!res || res.value == 0)
break;
s += static_cast<char>(res.value);
}
return TryReadResult<std::string>(c.translated, std::move(s));
}
bool IsOptimizableRAMAddress(const u32 address)
{
if (PowerPC::memchecks.HasAny())
@ -688,15 +807,44 @@ static bool IsRAMAddress(u32 address, bool translate)
return false;
}
bool HostIsRAMAddress(u32 address)
bool HostIsRAMAddress(u32 address, RequestedAddressSpace space)
{
switch (space)
{
case RequestedAddressSpace::Effective:
return IsRAMAddress<XCheckTLBFlag::NoException>(address, MSR.DR);
case RequestedAddressSpace::Physical:
return IsRAMAddress<XCheckTLBFlag::NoException>(address, false);
case RequestedAddressSpace::Virtual:
if (!MSR.DR)
return false;
return IsRAMAddress<XCheckTLBFlag::NoException>(address, true);
}
bool HostIsInstructionRAMAddress(u32 address)
assert(0);
return false;
}
bool HostIsInstructionRAMAddress(u32 address, RequestedAddressSpace space)
{
// Instructions are always 32bit aligned.
return !(address & 3) && IsRAMAddress<XCheckTLBFlag::OpcodeNoException>(address, MSR.IR);
if (!(address & 3))
return false;
switch (space)
{
case RequestedAddressSpace::Effective:
return IsRAMAddress<XCheckTLBFlag::OpcodeNoException>(address, MSR.IR);
case RequestedAddressSpace::Physical:
return IsRAMAddress<XCheckTLBFlag::OpcodeNoException>(address, false);
case RequestedAddressSpace::Virtual:
if (!MSR.IR)
return false;
return IsRAMAddress<XCheckTLBFlag::OpcodeNoException>(address, true);
}
assert(0);
return false;
}
void DMA_LCToMemory(const u32 mem_address, const u32 cache_address, const u32 num_blocks)

73
Source/Core/Core/PowerPC/MMU.h
View File

@ -14,7 +14,19 @@ namespace PowerPC
{
// Routines for debugger UI, cheats, etc. to access emulated memory from the
// perspective of the CPU. Not for use by core emulation routines.
// Use "Host_" prefix.
// Use "Host" prefix.
enum class RequestedAddressSpace
{
Effective, // whatever the current MMU state is
Physical, // as if the MMU was turned off
Virtual, // specifically want MMU turned on, fails if off
};
// Reads a value from emulated memory using the currently active MMU settings.
// If the read fails (eg. address does not correspond to a mapped address in the current address
// space), a PanicAlert will be shown to the user and zero (or an empty string for the string case)
// will be returned.
u8 HostRead_U8(u32 address);
u16 HostRead_U16(u32 address);
u32 HostRead_U32(u32 address);
@ -22,6 +34,54 @@ u64 HostRead_U64(u32 address);
float HostRead_F32(u32 address);
double HostRead_F64(u32 address);
u32 HostRead_Instruction(u32 address);
std::string HostGetString(u32 address, size_t size = 0);
template <typename T>
struct TryReadResult
{
// whether the read succeeded; if false, the other fields should not be touched
bool success;
// whether the address had to be translated (given address was treated as virtual) or not (given
// address was treated as physical)
bool translated;
// the actual value that was read
T value;
TryReadResult() : success(false) {}
TryReadResult(bool translated_, T&& value_)
: success(true), translated(translated_), value(std::move(value_))
{
}
TryReadResult(bool translated_, const T& value_)
: success(true), translated(translated_), value(value_)
{
}
explicit operator bool() const { return success; }
};
// Try to read a value from emulated memory at the given address in the given memory space.
// If the read succeeds, the returned TryReadResult contains the read value and information on
// whether the given address had to be translated or not. Unlike the HostRead functions, this does
// not raise a user-visible alert on failure.
TryReadResult<u8> HostTryReadU8(u32 address,
RequestedAddressSpace space = RequestedAddressSpace::Effective);
TryReadResult<u16> HostTryReadU16(u32 address,
RequestedAddressSpace space = RequestedAddressSpace::Effective);
TryReadResult<u32> HostTryReadU32(u32 address,
RequestedAddressSpace space = RequestedAddressSpace::Effective);
TryReadResult<u64> HostTryReadU64(u32 address,
RequestedAddressSpace space = RequestedAddressSpace::Effective);
TryReadResult<float> HostTryReadF32(u32 address,
RequestedAddressSpace space = RequestedAddressSpace::Effective);
TryReadResult<double>
HostTryReadF64(u32 address, RequestedAddressSpace space = RequestedAddressSpace::Effective);
TryReadResult<u32>
HostTryReadInstruction(u32 address, RequestedAddressSpace space = RequestedAddressSpace::Effective);
TryReadResult<std::string>
HostTryReadString(u32 address, size_t size = 0,
RequestedAddressSpace space = RequestedAddressSpace::Effective);
void HostWrite_U8(u8 var, u32 address);
void HostWrite_U16(u16 var, u32 address);
@ -30,14 +90,13 @@ void HostWrite_U64(u64 var, u32 address);
void HostWrite_F32(float var, u32 address);
void HostWrite_F64(double var, u32 address);
std::string HostGetString(u32 address, size_t size = 0);
// Returns whether a read or write to the given address will resolve to a RAM
// access given the current CPU state.
bool HostIsRAMAddress(u32 address);
// Returns whether a read or write to the given address will resolve to a RAM access in the given
// address space.
bool HostIsRAMAddress(u32 address, RequestedAddressSpace space = RequestedAddressSpace::Effective);
// Same as HostIsRAMAddress, but uses IBAT instead of DBAT.
bool HostIsInstructionRAMAddress(u32 address);
bool HostIsInstructionRAMAddress(u32 address,
RequestedAddressSpace space = RequestedAddressSpace::Effective);
// Routines for the CPU core to access memory.