Sprinter/mame
2
0
Fork 0
mirror of https://github.com/holub/mame synced 2025-04-22 16:31:49 +03:00
Code Issues Actions Packages Projects Releases Wiki Activity

brickzn: do swapped opcode decrypt whan command is written rather than predecrypting specific ranges

Browse Source
This commit is contained in:
David Haywood 2014-10-22 14:11:14 +01:00
parent b4bda080b3
commit dd257bfb06
2 changed files with 62 additions and 66 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

119
src/mame/drivers/suna8.c
View File

@ -86,14 +86,11 @@ DRIVER_INIT_MEMBER(suna8_state,hardhedb)
UINT8 *suna8_state::brickzn_decrypt()
{
address_space &space = m_maincpu->space(AS_PROGRAM);
UINT8 *RAM = memregion("maincpu")->base();
size_t size = memregion("maincpu")->bytes();
UINT8 *decrypt = auto_alloc_array(machine(), UINT8, size);
int i;
space.set_decrypted_region(0x0000, 0x7fff, decrypt);
/* Opcodes and data */
for (i = 0; i < 0x50000; i++)
{
@ -133,80 +130,59 @@ UINT8 *suna8_state::brickzn_decrypt()
DRIVER_INIT_MEMBER(suna8_state,brickzn)
{
UINT8 *RAM = memregion("maincpu")->base();
UINT8 *decrypt = brickzn_decrypt();
int i;
// Opcodes decrypted as data (to do: activated at run-time)
for (i = 0; i < 0x8000; i++)
{
if ( ((i >= 0x072b) && (i <= 0x076f)) ||
((i >= 0x45c5) && (i <= 0x45e4)) ||
((i >= 0x7393) && (i <= 0x73ba)) ||
((i >= 0x7a79) && (i <= 0x7aa9)) )
{
decrypt[i] = RAM[i];
}
}
m_decrypt = brickzn_decrypt();
// !!!!!! PATCHES !!!!!!
// To do: ROM banking should be disabled here
decrypt[0x11bb] = 0x00; // LD ($C040),A -> NOP
decrypt[0x11bc] = 0x00; // LD ($C040),A -> NOP
decrypt[0x11bd] = 0x00; // LD ($C040),A -> NOP
m_decrypt[0x11bb] = 0x00; // LD ($C040),A -> NOP
m_decrypt[0x11bc] = 0x00; // LD ($C040),A -> NOP
m_decrypt[0x11bd] = 0x00; // LD ($C040),A -> NOP
decrypt[0x3349] = 0xc9; // RET Z -> RET (to avoid: jp $C800)
m_decrypt[0x3349] = 0xc9; // RET Z -> RET (to avoid: jp $C800)
// NMI enable / source??
decrypt[0x1431] = 0xc9; // HALT -> RET
decrypt[0x24b5] = 0x00; // HALT -> NOP
decrypt[0x2593] = 0x00; // HALT -> NOP
m_decrypt[0x1431] = 0xc9; // HALT -> RET
m_decrypt[0x24b5] = 0x00; // HALT -> NOP
m_decrypt[0x2593] = 0x00; // HALT -> NOP
// Non-banked opcodes
address_space &space = m_maincpu->space(AS_PROGRAM);
space.set_decrypted_region(0x0000, 0x7fff, m_decrypt);
// Data banks: 00-0f normal data decryption, 10-1f alternate data decryption:
membank("bank1")->configure_entries(0, 16*2, memregion("maincpu")->base() + 0x10000, 0x4000);
// Opcode banks: 00-1f normal opcode decryption:
membank("bank1")->configure_decrypted_entries(0, 16, decrypt + 0x10000, 0x4000);
membank("bank1")->configure_decrypted_entries(16, 16, decrypt + 0x10000, 0x4000);
membank("bank1")->configure_decrypted_entries(0, 16, m_decrypt + 0x10000, 0x4000);
membank("bank1")->configure_decrypted_entries(16, 16, m_decrypt + 0x10000, 0x4000);
}
DRIVER_INIT_MEMBER(suna8_state,brickznv4)
{
UINT8 *RAM = memregion("maincpu")->base();
UINT8 *decrypt = brickzn_decrypt();
int i;
// Opcodes decrypted as data (to do: activated at run-time)
for (i = 0; i < 0x8000; i++)
{
if ( ((i >= 0x072b) && (i <= 0x076f)) ||
((i >= 0x4541) && (i <= 0x4560)) ||
((i >= 0x72f3) && (i <= 0x7322)) ||
((i >= 0x79d9) && (i <= 0x7a09)) )
{
decrypt[i] = RAM[i];
}
}
m_decrypt = brickzn_decrypt();
// !!!!!! PATCHES !!!!!!
// To do: ROM banking should be disabled here
decrypt[0x1190] = 0x00; // LD ($C040),A -> NOP
decrypt[0x1191] = 0x00; // LD ($C040),A -> NOP
decrypt[0x1192] = 0x00; // LD ($C040),A -> NOP
m_decrypt[0x1190] = 0x00; // LD ($C040),A -> NOP
m_decrypt[0x1191] = 0x00; // LD ($C040),A -> NOP
m_decrypt[0x1192] = 0x00; // LD ($C040),A -> NOP
decrypt[0x3337] = 0xc9; // RET Z -> RET (to avoid: jp $C800)
m_decrypt[0x3337] = 0xc9; // RET Z -> RET (to avoid: jp $C800)
// NMI enable / source??
decrypt[0x1406] = 0xc9; // HALT -> RET
decrypt[0x2487] = 0x00; // HALT -> NOP
decrypt[0x256c] = 0x00; // HALT -> NOP
m_decrypt[0x1406] = 0xc9; // HALT -> RET
m_decrypt[0x2487] = 0x00; // HALT -> NOP
m_decrypt[0x256c] = 0x00; // HALT -> NOP
// Non-banked opcodes
address_space &space = m_maincpu->space(AS_PROGRAM);
space.set_decrypted_region(0x0000, 0x7fff, m_decrypt);
// Data banks: 00-0f normal data decryption, 10-1f alternate data decryption:
membank("bank1")->configure_entries(0, 16*2, memregion("maincpu")->base() + 0x10000, 0x4000);
// Opcode banks: 00-1f normal opcode decryption:
membank("bank1")->configure_decrypted_entries(0, 16, decrypt + 0x10000, 0x4000);
membank("bank1")->configure_decrypted_entries(16, 16, decrypt + 0x10000, 0x4000);
membank("bank1")->configure_decrypted_entries(0, 16, m_decrypt + 0x10000, 0x4000);
membank("bank1")->configure_decrypted_entries(16, 16, m_decrypt + 0x10000, 0x4000);
}
@ -700,7 +676,9 @@ READ8_MEMBER(suna8_state::brickzn_cheats_r)
*/
WRITE8_MEMBER(suna8_state::brickzn_multi_w)
{
if ((m_protection_val & 0xfc) == 0x88 || (m_protection_val & 0xfc) == 0x8c)
int protselect = m_protection_val & 0xfc;
if ((protselect == 0x88) || (protselect == 0x8c))
{
m_palettebank = data & 0x01;
@ -713,7 +691,7 @@ WRITE8_MEMBER(suna8_state::brickzn_multi_w)
logerror("CPU #0 - PC %04X: soundlatch = %02X\n",space.device().safe_pc(),data);
}
else if ((m_protection_val & 0xfc) == 0x04)
else if (protselect == 0x04)
{
set_led_status(machine(), 0, data & 0x01);
set_led_status(machine(), 1, data & 0x02);
@ -722,16 +700,7 @@ WRITE8_MEMBER(suna8_state::brickzn_multi_w)
logerror("CPU #0 - PC %04X: leds = %02X\n",space.device().safe_pc(),data);
if (data & ~0x07) logerror("CPU #0 - PC %04X: unknown leds bits: %02X\n",space.device().safe_pc(),data);
}
else if ((m_protection_val & 0xfc) == 0x9c)
{
// controls opcode decryption
// see code at 71b, 45b7, 7380, 7a6b
// To be done: run-time opcode decryption change. Done in driver_init for now.
logerror("CPU #0 - PC %04X: op-decrypt = %02X\n",space.device().safe_pc(),data);
}
else if ((m_protection_val & 0xfc) == 0x80)
else if (protselect == 0x80)
{
// disables rom banking?
// see code at 11b1:
@ -742,6 +711,28 @@ WRITE8_MEMBER(suna8_state::brickzn_multi_w)
{
logerror("CPU #0 - PC %04X: ignore = %02X\n",space.device().safe_pc(),data);
}
if ((m_protection_val & 0x1f) == 0x1c)
{
// controls opcode decryption
// see code at 71b, 45b7, 7380, 7a6b
//printf("CPU #0 - PC %04X: alt op-decrypt tog = %02X\n",space.device().safe_pc(),data);
m_prot_opcode_toggle ^= 1;
if (m_prot_opcode_toggle == 0)
{
address_space &space = m_maincpu->space(AS_PROGRAM);
space.set_decrypted_region(0x0000, 0x7fff, m_decrypt);
}
else
{
address_space &space = m_maincpu->space(AS_PROGRAM);
space.set_decrypted_region(0x0000, 0x7fff, memregion("maincpu")->base());
}
}
}
/*

9
src/mame/includes/suna8.h
View File

@ -16,7 +16,10 @@ public:
m_samples(*this, "samples"),
m_gfxdecode(*this, "gfxdecode"),
m_screen(*this, "screen"),
m_palette(*this, "palette") { }
m_palette(*this, "palette"),
m_prot_opcode_toggle(0)
{ }
required_device<cpu_device> m_maincpu;
optional_shared_ptr<UINT8> m_hardhead_ip;
@ -41,7 +44,9 @@ public:
UINT8 m_nmi_enable;
UINT8 m_spritebank_latch;
UINT8 m_write_disable;
UINT8 m_prot_opcode_toggle;
UINT8* m_decrypt;
enum GFXBANK_TYPE_T
{
GFXBANK_TYPE_SPARKMAN,