RaySollium99/picodrive
1
0
Fork 0
mirror of https://github.com/RaySollium99/picodrive.git synced 2025-09-05 07:17:45 -04:00
Code Issues Projects Releases Packages Wiki Activity Actions

FAMEC idle loops, PSP port sync, minor adjustments

Browse source 
git-svn-id: file:///home/notaz/opt/svn/PicoDrive@525 be3aeb3a-fb24-0410-a615-afba39da0efa
This commit is contained in:
notaz 2008-07-05 23:10:24 +00:00
parent b06778874d
commit c060a9ab9c
23 changed files with 408 additions and 155 deletions
Download patch file Download diff file Expand all files Collapse all files

98
cpu/fame/famec_opcodes.h
View file

@ -39961,3 +39961,101 @@ OPCODE(0xE7E7)
RET(14)
}
#ifdef PICODRIVE_HACK
// BRA
OPCODE(0x6001_idle)
{
#ifdef FAMEC_CHECK_BRANCHES
u32 newPC = (u32)(PC) - BasePC;
s8 offs=Opcode;
newPC += offs;
SET_PC(newPC);
CHECK_BRANCH_EXCEPTION(offs)
#else
PC += ((s8)(Opcode & 0xFE)) >> 1;
#endif
{
extern int idle_hit_counter;
idle_hit_counter++;
}
m68kcontext.io_cycle_counter = 10;
RET(10)
}
// BCC
OPCODE(0x6601_idle)
{
if (flag_NotZ)
{
extern int idle_hit_counter;
idle_hit_counter++;
PC += ((s8)(Opcode & 0xFE)) >> 1;
m68kcontext.io_cycle_counter = 8;
}
RET(8)
}
OPCODE(0x6701_idle)
{
if (!flag_NotZ)
{
extern int idle_hit_counter;
idle_hit_counter++;
PC += ((s8)(Opcode & 0xFE)) >> 1;
m68kcontext.io_cycle_counter = 8;
}
RET(8)
}
extern int SekIsIdleCode(unsigned short *dst, int bytes);
extern int SekRegisterIdlePatch(unsigned int pc, int oldop, int newop);
OPCODE(idle_detector_bcc8)
{
extern int idledet_start_frame;
extern char Pico[];
int frame_count, cond_true, bytes, ret, newop;
u16 *dest_pc;
dest_pc = PC + (((s8)(Opcode & 0xFE)) >> 1);
frame_count = *(int *)(Pico+0x22208+0x1c); // Pico.m.frame_count
if (frame_count < idledet_start_frame)
goto end;
bytes = 0 - (s8)(Opcode & 0xFE) - 2;
ret = SekIsIdleCode(dest_pc, bytes);
newop = (Opcode & 0xfe) | 0x7100;
if (!ret) newop |= 0x200;
if (Opcode & 0x0100) newop |= 0x400; // beq
ret = SekRegisterIdlePatch(GET_PC - 2, Opcode, newop);
switch (ret)
{
case 0: PC[-1] = newop; break;
case 1: break;
case 2: JumpTable[Opcode] = (Opcode & 0x0100) ? CAST_OP(0x6701) : CAST_OP(0x6601); break;
}
end:
cond_true = (Opcode & 0x0100) ? !flag_NotZ : flag_NotZ; // beq?
if (cond_true)
{
PC = dest_pc;
m68kcontext.io_cycle_counter -= 2;
}
RET(8)
}
OPCODE(idle_detector_dead)
{
// patch without further questions
int newop = 0x7d00 | (Opcode & 0xff);
PC[-1] = newop;
SekRegisterIdlePatch(GET_PC - 2, Opcode, newop);
PC += ((s8)(Opcode & 0xFE)) >> 1;
RET(10)
}
#endif // PICODRIVE_HACK