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Remove unused static handler entries. Also ensure that subsequent mapping/

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unmapping of static memory types does not change the memory parameters.
This fixes the case where dynamically unmapping memory could lead to
incorrectly reported offsets. [Aaron Giles]
This commit is contained in:
Aaron Giles 2011-03-17 07:23:21 +00:00
parent 4be37affb8
commit 2b47d0d5a4
1 changed files with 11 additions and 12 deletions
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23
src/emu/memory.c
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@ -232,9 +232,7 @@ enum
{
STATIC_INVALID = 0, // invalid - should never be used
STATIC_BANK1 = 1, // first memory bank
STATIC_BANKMAX = 122, // last memory bank
STATIC_RAM, // RAM - reads/writes map to dynamic banks
STATIC_ROM, // ROM - reads = RAM; writes = UNMAP
STATIC_BANKMAX = 124, // last memory bank
STATIC_NOP, // NOP - reads = unmapped value; writes = no-op
STATIC_UNMAP, // unmapped - same as NOP except we log errors
STATIC_WATCHPOINT, // watchpoint - used internally
@ -1073,7 +1071,7 @@ public:
const handler_entry_read &handler = m_read.handler_read(entry);
// 8-bit case: RAM/ROM
if (entry >= STATIC_RAM)
if (entry > STATIC_BANKMAX)
return NULL;
return handler.ramptr(handler.byteoffset(byteaddress));
}
@ -1087,7 +1085,7 @@ public:
const handler_entry_write &handler = m_write.handler_write(entry);
// 8-bit case: RAM/ROM
if (entry >= STATIC_RAM)
if (entry > STATIC_BANKMAX)
return NULL;
return handler.ramptr(handler.byteoffset(byteaddress));
}
@ -1107,7 +1105,7 @@ public:
// either read directly from RAM, or call the delegate
offset = handler.byteoffset(byteaddress);
_NativeType result;
if (entry < STATIC_RAM) result = *reinterpret_cast<_NativeType *>(handler.ramptr(offset));
if (entry <= STATIC_BANKMAX) result = *reinterpret_cast<_NativeType *>(handler.ramptr(offset));
else if (sizeof(_NativeType) == 1) result = handler.read8(*this, offset, mask);
else if (sizeof(_NativeType) == 2) result = handler.read16(*this, offset >> 1, mask);
else if (sizeof(_NativeType) == 4) result = handler.read32(*this, offset >> 2, mask);
@ -1132,7 +1130,7 @@ public:
// either read directly from RAM, or call the delegate
offset = handler.byteoffset(byteaddress);
_NativeType result;
if (entry < STATIC_RAM) result = *reinterpret_cast<_NativeType *>(handler.ramptr(offset));
if (entry <= STATIC_BANKMAX) result = *reinterpret_cast<_NativeType *>(handler.ramptr(offset));
else if (sizeof(_NativeType) == 1) result = handler.read8(*this, offset, 0xff);
else if (sizeof(_NativeType) == 2) result = handler.read16(*this, offset >> 1, 0xffff);
else if (sizeof(_NativeType) == 4) result = handler.read32(*this, offset >> 2, 0xffffffff);
@ -1154,7 +1152,7 @@ public:
// either write directly to RAM, or call the delegate
offset = handler.byteoffset(byteaddress);
if (entry < STATIC_RAM)
if (entry <= STATIC_BANKMAX)
{
_NativeType *dest = reinterpret_cast<_NativeType *>(handler.ramptr(offset));
*dest = (*dest & ~mask) | (data & mask);
@ -1179,7 +1177,7 @@ public:
// either write directly to RAM, or call the delegate
offset = handler.byteoffset(byteaddress);
if (entry < STATIC_RAM) *reinterpret_cast<_NativeType *>(handler.ramptr(offset)) = data;
if (entry <= STATIC_BANKMAX) *reinterpret_cast<_NativeType *>(handler.ramptr(offset)) = data;
else if (sizeof(_NativeType) == 1) handler.write8(*this, offset, data, 0xff);
else if (sizeof(_NativeType) == 2) handler.write16(*this, offset >> 1, data, 0xffff);
else if (sizeof(_NativeType) == 4) handler.write32(*this, offset >> 2, data, 0xffffffff);
@ -3183,9 +3181,10 @@ UINT8 address_table::map_range(offs_t addrstart, offs_t addrend, offs_t addrmask
throw emu_fatalerror("Out of handler entries in address table");
}
// configure the entry to our parameters
// configure the entry to our parameters (but not for static non-banked cases)
handler_entry &curentry = handler(entry);
curentry.configure(bytestart, byteend, bytemask);
if (entry <= STATIC_BANKMAX || entry >= STATIC_COUNT)
curentry.configure(bytestart, byteend, bytemask);
// populate it
populate_range_mirrored(bytestart, byteend, bytemirror, entry);
@ -3931,7 +3930,7 @@ bool direct_read_data::set_direct_region(offs_t &byteaddress)
direct_range *range = find_range(overrideaddress, m_entry);
// if we don't map to a bank, return FALSE
if (m_entry < STATIC_BANK1 || m_entry >= STATIC_RAM)
if (m_entry < STATIC_BANK1 || m_entry > STATIC_BANKMAX)
{
// ensure future updates to land here as well until we get back into a bank
m_byteend = 0;