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HDD r/w: error if r/w overlaps with I/O memory

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. break to debugger if single-stepping
HDD write: support memory accesses across 64KiB boundary
This commit is contained in:
tomcw 2021-12-09 21:22:13 +00:00
parent c594d6e101
commit bb6fa80335
3 changed files with 59 additions and 4 deletions
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22
source/Debugger/Debug.cpp
View File

@ -68,6 +68,8 @@ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
int g_nDebugBreakOnInvalid = 0; // Bit Flags of Invalid Opcode to break on: // iOpcodeType = AM_IMPLIED (BRK), AM_1, AM_2, AM_3
int g_iDebugBreakOnOpcode = 0;
bool g_bDebugBreakOnInterrupt = false;
static int g_iDebugBreakOnDmaToOrFromIoMemory = 0;
static WORD g_uDebugBreakOnDmaIoMemoryAddr = 0;
static int g_bDebugBreakpointHit = 0; // See: BreakpointHit_t
@ -1251,6 +1253,20 @@ void ClearTempBreakpoints ()
}
}
//===========================================================================
static int CheckBreakpointsDmaToOrFromIoMemory(void)
{
int res = g_iDebugBreakOnDmaToOrFromIoMemory;
g_iDebugBreakOnDmaToOrFromIoMemory = 0;
return res;
}
void DebuggerBreakOnDmaToOrFromIoMemory(WORD addr, bool isDmaToMemory)
{
g_iDebugBreakOnDmaToOrFromIoMemory = isDmaToMemory ? BP_DMA_TO_IO_MEM : BP_DMA_FROM_IO_MEM;
g_uDebugBreakOnDmaIoMemoryAddr = addr;
}
//===========================================================================
Update_t CmdBreakpoint (int nArgs)
{
@ -8307,7 +8323,7 @@ void DebugContinueStepping(const bool bCallerWillUpdateDisplay/*=false*/)
g_bDebugBreakpointHit |= BP_HIT_INTERRUPT;
}
g_bDebugBreakpointHit |= CheckBreakpointsIO() | CheckBreakpointsReg();
g_bDebugBreakpointHit |= CheckBreakpointsIO() | CheckBreakpointsReg() | CheckBreakpointsDmaToOrFromIoMemory();
}
if (regs.pc == g_nDebugStepUntil || g_bDebugBreakpointHit)
@ -8334,6 +8350,10 @@ void DebugContinueStepping(const bool bCallerWillUpdateDisplay/*=false*/)
pszStopReason = TEXT("PC reads from floating bus or I/O memory");
else if (g_bDebugBreakpointHit & BP_HIT_INTERRUPT)
sprintf_s(szStopMessage, sizeof(szStopMessage), "Interrupt occurred at $%04X", g_LBR);
else if (g_bDebugBreakpointHit & BP_DMA_TO_IO_MEM)
sprintf_s(szStopMessage, sizeof(szStopMessage), "HDD DMA to I/O memory $%04X", g_uDebugBreakOnDmaIoMemoryAddr);
else if (g_bDebugBreakpointHit & BP_DMA_FROM_IO_MEM)
sprintf_s(szStopMessage, sizeof(szStopMessage), "HDD DMA from I/O memory $%04X", g_uDebugBreakOnDmaIoMemoryAddr);
else
pszStopReason = TEXT("Unknown!");

3
source/Debugger/Debug.h
View File

@ -39,6 +39,8 @@
, BP_HIT_MEMW = (1 << 5)
, BP_HIT_PC_READ_FLOATING_BUS_OR_IO_MEM = (1 << 6)
, BP_HIT_INTERRUPT = (1 << 7)
, BP_DMA_TO_IO_MEM = (1 << 8)
, BP_DMA_FROM_IO_MEM = (1 << 9)
};
extern int g_nBreakpoints;
@ -181,3 +183,4 @@
void DebuggerMouseClick( int x, int y );
bool IsDebugSteppingAtFullSpeed(void);
void DebuggerBreakOnDmaToOrFromIoMemory(WORD addr, bool isDmaToMemory);

36
source/Harddisk.cpp
View File

@ -39,6 +39,7 @@ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#include "SaveState.h"
#include "YamlHelper.h"
#include "Debugger/Debug.h"
#include "../resource/resource.h"
/*
@ -520,7 +521,12 @@ BYTE __stdcall HarddiskInterfaceCard::IORead(WORD pc, WORD addr, BYTE bWrite, BY
LPBYTE page = memwrite[dstAddr >> 8];
if (!page)
{
_ASSERT(0);
if (g_nAppMode == MODE_STEPPING)
DebuggerBreakOnDmaToOrFromIoMemory(dstAddr, true);
//else // Show MessageBox?
pCard->m_notBusyCycle = 0; // DMA complete
bRes = false;
break;
}
@ -535,7 +541,8 @@ BYTE __stdcall HarddiskInterfaceCard::IORead(WORD pc, WORD addr, BYTE bWrite, BY
remaining -= size;
}
}
else
if (!bRes)
{
pHDD->m_error = 1;
r = DEVICE_IO_ERROR;
@ -568,7 +575,32 @@ BYTE __stdcall HarddiskInterfaceCard::IORead(WORD pc, WORD addr, BYTE bWrite, BY
}
}
// Trap and error on any accesses that overlap with I/O memory
if ((pHDD->m_memblock < 0xC000 && ((pHDD->m_memblock + HD_BLOCK_SIZE - 1) >= 0xC000)) // 1) Starts before I/O, but ends in I/O memory
|| ((pHDD->m_memblock >> 12) == 0xC)) // 2) Starts in I/O memory
{
WORD dstAddr = ((pHDD->m_memblock >> 12) == 0xC) ? pHDD->m_memblock : 0xC000;
if (g_nAppMode == MODE_STEPPING)
DebuggerBreakOnDmaToOrFromIoMemory(dstAddr, false);
//else // Show MessageBox?
pCard->m_notBusyCycle = 0; // DMA complete
bRes = false;
}
else
{
if (pHDD->m_memblock <= 0xFE00)
{
memcpy(pHDD->m_buf, mem + pHDD->m_memblock, HD_BLOCK_SIZE);
}
else // wraps on 64KiB boundary
{
const UINT size = 0x10000 - pHDD->m_memblock;
memcpy(pHDD->m_buf, mem + pHDD->m_memblock, size);
memcpy(pHDD->m_buf + size, mem, HD_BLOCK_SIZE - size);
}
}
if (bRes)
bRes = ImageWriteBlock(pHDD->m_imagehandle, pHDD->m_diskblock, pHDD->m_buf);