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https://github.com/holub/mame
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start using callbacks for decathlete style decompression (start of refactoring) (nw)
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mamehaze
parent
a9aa910a4e
commit
dd40bb3b09
@ -1026,9 +1026,21 @@ static MACHINE_CONFIG_DERIVED( stv_5881, stv )
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MCFG_SET_READ_CALLBACK(stv_state, crypt_read_callback)
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MACHINE_CONFIG_END
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UINT16 stv_state::crypt_read_callback_ch1(UINT32 addr)
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{
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return m_maincpu->space().read_word(0x02000000 + 0x1000000 + (addr * 2));
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}
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UINT16 stv_state::crypt_read_callback_ch2(UINT32 addr)
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{
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return m_maincpu->space().read_word(0x02000000 + 0x0000000 + (addr * 2));
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}
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static MACHINE_CONFIG_DERIVED( stv_5838, stv )
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MCFG_DEVICE_ADD("315_5838", SEGA315_5838_COMP, 0)
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// MCFG_SET_5838_READ_CALLBACK(stv_state, crypt_read_callback)
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MCFG_SET_5838_READ_CALLBACK_CH1(stv_state, crypt_read_callback_ch1)
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MCFG_SET_5838_READ_CALLBACK_CH2(stv_state, crypt_read_callback_ch2)
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MACHINE_CONFIG_END
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@ -815,6 +815,8 @@ public:
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optional_device<sega_315_5881_crypt_device> m_cryptdevice;
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optional_device<sega_315_5838_comp_device> m_5838crypt;
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UINT16 crypt_read_callback(UINT32 addr);
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UINT16 crypt_read_callback_ch1(UINT32 addr);
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UINT16 crypt_read_callback_ch2(UINT32 addr);
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};
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@ -9,10 +9,25 @@
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Decathlete uses it to compress ALL the game graphics, Dead or Alive uses it for a
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dumb security check, decompressing a single string.
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Each channel appears to be connected to a different set of ROMs, however there is
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defintiely only 315-5838 single chip.
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Dead of Alive only uses a single channel, and has the source data in RAM, not ROM.
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This is similar to how some 5881 games were set up, with the ST-V versions decrypting
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data directly from ROM and the Model 2 ones using a RAM source buffer.
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Looking at the values read I don't think there is any address based encryption, for
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example many blocks where you'd expect a zero fill start with repeating patterns
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of 8f708f70 (different lengths) which would appear to relate to compressed 0x00 data
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read addr 0071253c, blah_r 8f708f70 - read count count 00000004
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read addr 00712540, blah_r 8f708f70 - read count count 00000008
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read addr 00712544, blah_r 8f708f70 - read count count 0000000c
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read addr 00712548, blah_r 8f708f70 - read count count 00000010
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read addr 0071254c, blah_r 8f708f70 - read count count 00000014
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read addr 00712550, blah_r 8f708f70 - read count count 00000018
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read addr 00712554, blah_r 8f708f70 - read count count 0000001c
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*/
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#include "emu.h"
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@ -20,6 +35,7 @@
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extern const device_type SEGA315_5838_COMP = &device_creator<sega_315_5838_comp_device>;
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//#define DEBUG_DATA_DUMP
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sega_315_5838_comp_device::sega_315_5838_comp_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
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: device_t(mconfig, SEGA315_5838_COMP, "Sega 315-5838 / 317-0029 Compression (Encryption?)", tag, owner, clock, "SEGA315_5838", __FILE__)
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@ -33,6 +49,9 @@ void sega_315_5838_comp_device::device_start()
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m_decathlt_lastcount = 0;
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m_decathlt_prot_uploadmode = 0;
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m_decathlt_prot_uploadoffset = 0;
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m_read_ch1.bind_relative_to(*owner());
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m_read_ch2.bind_relative_to(*owner());
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}
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void sega_315_5838_comp_device::device_reset()
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@ -53,32 +72,63 @@ void sega_315_5838_comp_device::device_reset()
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*
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**************************/
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READ32_MEMBER( sega_315_5838_comp_device::decathlt_prot_r )
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#ifdef DEBUG_DATA_DUMP
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FILE* tempfile;
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#endif
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READ32_MEMBER(sega_315_5838_comp_device::decathlt_prot_r)
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{
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// the offsets written to the protection device definitely only refer to 2 of the roms
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// it's a fair assumption to say that only those 2 are connected to the protection device
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UINT8 *ROM = (UINT8 *)memregion(":abus")->base()+0x1000000;
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UINT32 *fake0 = (UINT32*)memregion( ":fake0" )->base();
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return genericdecathlt_prot_r(offset, mem_mask, 0);
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}
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READ32_MEMBER(sega_315_5838_comp_device::decathlt_prot_ch2_r)
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{
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return genericdecathlt_prot_r(offset, mem_mask, 1);
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}
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UINT32 sega_315_5838_comp_device::genericdecathlt_prot_r(UINT32 offset, UINT32 mem_mask, int which)
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{
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// UINT32 *fake0 = (UINT32*)memregion( ":fake0" )->base();
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if (offset==2)
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{
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UINT32 retvalue = 0xffff;
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// UINT32 retvalue = 0xffff;
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switch (m_decathlt_protregs[0])
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{
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default:
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retvalue = ROM[(m_decathlt_protregs[0]*2)-2];
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retvalue <<= 8;
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retvalue |= ROM[((m_decathlt_protregs[0]+1)*2)+1-2];
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retvalue <<= 8;
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retvalue |= ROM[((m_decathlt_protregs[0]+1)*2)-2];
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retvalue <<= 8;
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retvalue |= ROM[((m_decathlt_protregs[0]+2)*2)+1-2];
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m_decathlt_lastcount++;
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logerror("read addr %08x, blah_r %08x - read count count %08x\n", m_decathlt_protregs[0], retvalue, m_decathlt_lastcount*4);
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m_decathlt_protregs[0]+=2;
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return retvalue;
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m_decathlt_lastcount++;
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UINT32 tempdata = 0;
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if (which == 0)
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{
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tempdata |= m_read_ch1(m_decathlt_protregs[0]) << 16;
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m_decathlt_protregs[0]++;
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tempdata |= m_read_ch1(m_decathlt_protregs[0]) << 0;
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m_decathlt_protregs[0]++;
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}
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else
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{
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tempdata |= m_read_ch2(m_decathlt_protregs[0]) << 16;
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m_decathlt_protregs[0]++;
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tempdata |= m_read_ch2(m_decathlt_protregs[0]) << 0;
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m_decathlt_protregs[0]++;
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}
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#ifdef DEBUG_DATA_DUMP
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//printf("read addr %08x, blah_r %08x - read count count %08x\n", m_decathlt_protregs[0]*2, tempdata, m_decathlt_lastcount*4);
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fwrite(&tempdata, 1, 4, tempfile);
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#else
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logerror("read addr %08x, blah_r %08x - read count count %08x\n", m_decathlt_protregs[0]*2, tempdata, m_decathlt_lastcount*4);
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#endif
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return tempdata;
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#if 0
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case 0x03228e4:
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if (fake0) retvalue = fake0[(((0x20080/4)+m_decathlt_lastcount))];
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m_decathlt_lastcount++;
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@ -128,6 +178,7 @@ READ32_MEMBER( sega_315_5838_comp_device::decathlt_prot_r )
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case 0x0018424:
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return retvalue;
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#endif
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}
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@ -156,6 +207,19 @@ void sega_315_5838_comp_device::write_prot_data(UINT32 data, UINT32 mem_mask, in
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//if (m_decathlt_part==0) logerror("%d, last read count was %06x\n",which, m_decathlt_lastcount*4);
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m_decathlt_lastcount = 0;
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if (m_decathlt_part==1) logerror("%d Decathlete prot W offset %04x data %08x, %08x, >>> regs %08x <<<<, %08x, %08x, %08x\n",which, offset, data, m_decathlt_protregs[0], m_decathlt_protregs[0]*4, m_decathlt_protregs[1], m_decathlt_protregs[2], m_decathlt_protregs[3]);
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#ifdef DEBUG_DATA_DUMP
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if (mem_mask == 0x0000ffff)
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{
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if (tempfile)
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fclose(tempfile);
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char filename[256];
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sprintf(filename, "%d_compressed_%08x", which, m_decathlt_protregs[0] );
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tempfile = fopen(filename, "w+b");
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}
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#endif
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}
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if (offset==1) // uploads 2 tables...
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@ -287,7 +351,7 @@ void sega_315_5838_comp_device::install_decathlt_protection()
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cpu->space(AS_PROGRAM).install_readwrite_handler(0x37FFFF0, 0x37FFFFF, read32_delegate(FUNC(sega_315_5838_comp_device::decathlt_prot_r), this), write32_delegate(FUNC(sega_315_5838_comp_device::decathlt_prot1_w), this));
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/* It accesses the device at this address too, with different tables, for the game textures, should it just act like a mirror, or a secondary device? */
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cpu->space(AS_PROGRAM).install_readwrite_handler(0x27FFFF0, 0x27FFFFF, read32_delegate(FUNC(sega_315_5838_comp_device::decathlt_prot_r), this), write32_delegate(FUNC(sega_315_5838_comp_device::decathlt_prot2_w), this));
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cpu->space(AS_PROGRAM).install_readwrite_handler(0x27FFFF0, 0x27FFFFF, read32_delegate(FUNC(sega_315_5838_comp_device::decathlt_prot_ch2_r), this), write32_delegate(FUNC(sega_315_5838_comp_device::decathlt_prot2_w), this));
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}
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@ -4,13 +4,15 @@
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#ifndef __SEGA315_5838_COMP__
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#define __SEGA315_5838_COMP__
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typedef device_delegate<UINT16 (UINT32)> sega_m2_read_delegate;
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typedef device_delegate<UINT16 (UINT32)> sega_dec_read_delegate;
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extern const device_type SEGA315_5838_COMP;
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#define MCFG_SET_5838_READ_CALLBACK( _class, _method) \
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sega_315_5838_comp_device::set_read_cb(*device, sega_m2_read_delegate(&_class::_method, #_class "::" #_method, NULL, (_class *)0));
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#define MCFG_SET_5838_READ_CALLBACK_CH1( _class, _method) \
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sega_315_5838_comp_device::set_read_cb_ch1(*device, sega_m2_read_delegate(&_class::_method, #_class "::" #_method, NULL, (_class *)0));
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#define MCFG_SET_5838_READ_CALLBACK_CH2( _class, _method) \
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sega_315_5838_comp_device::set_read_cb_ch2(*device, sega_m2_read_delegate(&_class::_method, #_class "::" #_method, NULL, (_class *)0));
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class sega_315_5838_comp_device : public device_t
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{
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@ -18,15 +20,25 @@ public:
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// construction/destruction
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sega_315_5838_comp_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock);
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sega_m2_read_delegate m_read;
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sega_dec_read_delegate m_read_ch1;
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sega_dec_read_delegate m_read_ch2;
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static void set_read_cb(device_t &device,sega_m2_read_delegate readcb)
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static void set_read_cb_ch1(device_t &device,sega_dec_read_delegate readcb)
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{
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sega_315_5838_comp_device &dev = downcast<sega_315_5838_comp_device &>(device);
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dev.m_read = readcb;
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dev.m_read_ch1 = readcb;
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}
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static void set_read_cb_ch2(device_t &device,sega_dec_read_delegate readcb)
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{
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sega_315_5838_comp_device &dev = downcast<sega_315_5838_comp_device &>(device);
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dev.m_read_ch2 = readcb;
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}
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DECLARE_READ32_MEMBER(decathlt_prot_r);
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DECLARE_READ32_MEMBER(decathlt_prot_ch2_r);;
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UINT32 genericdecathlt_prot_r(UINT32 offset, UINT32 mem_mask, int which);
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void write_prot_data(UINT32 data, UINT32 mem_mask, int offset, int which);
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DECLARE_WRITE32_MEMBER(decathlt_prot1_w);
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DECLARE_WRITE32_MEMBER(decathlt_prot2_w);
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