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the non-working crystal system games make a lot of unaligned accesses, the working ones do not, this might be significant (nw)

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David Haywood 2015-11-23 11:52:11 +00:00
parent d13c62f124
commit 65f9753bff
1 changed files with 26 additions and 11 deletions
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37
src/devices/cpu/se3208/se3208.cpp
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@ -51,10 +51,19 @@ se3208_device::se3208_device(const machine_config &mconfig, const char *tag, dev
UINT32 se3208_device::read_dword_unaligned(address_space &space, UINT32 address)
{
if (address & 3)
return space.read_byte(address) | space.read_byte(address+1)<<8 | space.read_byte(address+2)<<16 | space.read_byte(address+3)<<24;
else
switch (address & 3)
{
case 0:
return space.read_dword(address);
case 1:
case 2:
case 3:
// printf("dword read unaligned %d\n", address & 3);
return space.read_byte(address) | space.read_byte(address + 1) << 8 | space.read_byte(address + 2) << 16 | space.read_byte(address + 3) << 24;
}
return 0;
}
UINT16 se3208_device::read_word_unaligned(address_space &space, UINT32 address)
@ -67,17 +76,23 @@ UINT16 se3208_device::read_word_unaligned(address_space &space, UINT32 address)
void se3208_device::write_dword_unaligned(address_space &space, UINT32 address, UINT32 data)
{
if (address & 3)
{
space.write_byte(address, data & 0xff);
space.write_byte(address+1, (data>>8)&0xff);
space.write_byte(address+2, (data>>16)&0xff);
space.write_byte(address+3, (data>>24)&0xff);
}
else
switch (address & 3)
{
case 0:
space.write_dword(address, data);
break;
case 1:
case 2:
case 3:
space.write_byte(address, data & 0xff);
space.write_byte(address + 1, (data >> 8) & 0xff);
space.write_byte(address + 2, (data >> 16) & 0xff);
space.write_byte(address + 3, (data >> 24) & 0xff);
// printf("dword write unaligned %d\n", address & 3);
break;
}
}
void se3208_device::write_word_unaligned(address_space &space, UINT32 address, UINT16 data)