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Diffstat (limited to 'Source/Core/DSPCore/Src/DspIntBranch.cpp')
| -rw-r--r-- | Source/Core/DSPCore/Src/DspIntBranch.cpp | 275 |
1 files changed, 0 insertions, 275 deletions
diff --git a/Source/Core/DSPCore/Src/DspIntBranch.cpp b/Source/Core/DSPCore/Src/DspIntBranch.cpp deleted file mode 100644 index 1113425a87..0000000000 --- a/Source/Core/DSPCore/Src/DspIntBranch.cpp +++ /dev/null @@ -1,275 +0,0 @@ -// Copyright (C) 2003 Dolphin Project. - -// This program is free software: you can redistribute it and/or modify -// it under the terms of the GNU General Public License as published by -// the Free Software Foundation, version 2.0. - -// This program is distributed in the hope that it will be useful, -// but WITHOUT ANY WARRANTY; without even the implied warranty of -// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -// GNU General Public License 2.0 for more details. - -// A copy of the GPL 2.0 should have been included with the program. -// If not, see http://www.gnu.org/licenses/ - -// Official SVN repository and contact information can be found at -// http://code.google.com/p/dolphin-emu/ - -// Additional copyrights go to Duddie and Tratax (c) 2004 - -#include "DSPInterpreter.h" -#include "DSPCore.h" -#include "DSPMemoryMap.h" -#include "DSPStacks.h" - -#include "DSPIntCCUtil.h" -#include "DSPIntUtil.h" - -namespace DSPInterpreter { - -// Generic call implementation -// CALLcc addressA -// 0000 0010 1011 cccc -// aaaa aaaa aaaa aaaa -// Call function if condition cc has been met. Push program counter of -// instruction following "call" to $st0. Set program counter to address -// represented by value that follows this "call" instruction. -void call(const UDSPInstruction opc) -{ - // must be outside the if. - u16 dest = dsp_fetch_code(); - if (CheckCondition(opc & 0xf)) - { - dsp_reg_store_stack(DSP_STACK_C, g_dsp.pc); - g_dsp.pc = dest; - } -} - -// Generic callr implementation -// CALLRcc $R -// 0001 0111 rrr1 cccc -// Call function if condition cc has been met. Push program counter of -// instruction following "call" to call stack $st0. Set program counter to -// register $R. -void callr(const UDSPInstruction opc) -{ - if (CheckCondition(opc & 0xf)) - { - u8 reg = (opc >> 5) & 0x7; - u16 addr = dsp_op_read_reg(reg); - dsp_reg_store_stack(DSP_STACK_C, g_dsp.pc); - g_dsp.pc = addr; - } -} - -// Generic if implementation -// IFcc -// 0000 0010 0111 cccc -// Execute following opcode if the condition has been met. -void ifcc(const UDSPInstruction opc) -{ - if (!CheckCondition(opc & 0xf)) - { - // skip the next opcode - we have to lookup its size. - dsp_skip_inst(); - } -} - -// Generic jmp implementation -// Jcc addressA -// 0000 0010 1001 cccc -// aaaa aaaa aaaa aaaa -// Jump to addressA if condition cc has been met. Set program counter to -// address represented by value that follows this "jmp" instruction. -void jcc(const UDSPInstruction opc) -{ - u16 dest = dsp_fetch_code(); - if (CheckCondition(opc & 0xf)) - { - g_dsp.pc = dest; - } -} - -// Generic jmpr implementation -// JMPcc $R -// 0001 0111 rrr0 cccc -// Jump to address; set program counter to a value from register $R. -void jmprcc(const UDSPInstruction opc) -{ - if (CheckCondition(opc & 0xf)) - { - u8 reg = (opc >> 5) & 0x7; - g_dsp.pc = dsp_op_read_reg(reg); - } -} - -// Generic ret implementation -// RETcc -// 0000 0010 1101 cccc -// Return from subroutine if condition cc has been met. Pops stored PC -// from call stack $st0 and sets $pc to this location. -void ret(const UDSPInstruction opc) -{ - if (CheckCondition(opc & 0xf)) - { - g_dsp.pc = dsp_reg_load_stack(DSP_STACK_C); - } -} - -// RTI -// 0000 0010 1111 1111 -// Return from exception. Pops stored status register $sr from data stack -// $st1 and program counter PC from call stack $st0 and sets $pc to this -// location. -void rti(const UDSPInstruction opc) -{ - g_dsp.r.sr = dsp_reg_load_stack(DSP_STACK_D); - g_dsp.pc = dsp_reg_load_stack(DSP_STACK_C); - -} - -// HALT -// 0000 0000 0020 0001 -// Stops execution of DSP code. Sets bit DSP_CR_HALT in register DREG_CR. -void halt(const UDSPInstruction opc) -{ - g_dsp.cr |= 0x4; - g_dsp.pc--; -} - - -// LOOP handling: Loop stack is used to control execution of repeated blocks of -// instructions. Whenever there is value on stack $st2 and current PC is equal -// value at $st2, then value at stack $st3 is decremented. If value is not zero -// then PC is modified with value from call stack $st0. Otherwise values from -// call stack $st0 and both loop stacks $st2 and $st3 are popped and execution -// continues at next opcode. -void HandleLoop() -{ - // Handle looping hardware. - const u16 rCallAddress = g_dsp.r.st[0]; - const u16 rLoopAddress = g_dsp.r.st[2]; - u16& rLoopCounter = g_dsp.r.st[3]; - - if (rLoopAddress > 0 && rLoopCounter > 0) - { - // FIXME: why -1? because we just read past it. - if (g_dsp.pc - 1 == rLoopAddress) - { - rLoopCounter--; - if (rLoopCounter > 0) - { - g_dsp.pc = rCallAddress; - } - else - { - // end of loop - dsp_reg_load_stack(0); - dsp_reg_load_stack(2); - dsp_reg_load_stack(3); - } - } - } -} - - -// LOOP $R -// 0000 0000 010r rrrr -// Repeatedly execute following opcode until counter specified by value -// from register $R reaches zero. Each execution decrement counter. Register -// $R remains unchanged. If register $R is set to zero at the beginning of loop -// then looped instruction will not get executed. -// Actually, this instruction simply prepares the loop stacks for the above. -// The looping hardware takes care of the rest. -void loop(const UDSPInstruction opc) -{ - u16 reg = opc & 0x1f; - u16 cnt = dsp_op_read_reg(reg); - u16 loop_pc = g_dsp.pc; - - if (cnt) - { - dsp_reg_store_stack(0, g_dsp.pc); - dsp_reg_store_stack(2, loop_pc); - dsp_reg_store_stack(3, cnt); - } -} - -// LOOPI #I -// 0001 0000 iiii iiii -// Repeatedly execute following opcode until counter specified by -// immediate value I reaches zero. Each execution decrement counter. If -// immediate value I is set to zero at the beginning of loop then looped -// instruction will not get executed. -// Actually, this instruction simply prepares the loop stacks for the above. -// The looping hardware takes care of the rest. -void loopi(const UDSPInstruction opc) -{ - u16 cnt = opc & 0xff; - u16 loop_pc = g_dsp.pc; - - if (cnt) - { - dsp_reg_store_stack(0, g_dsp.pc); - dsp_reg_store_stack(2, loop_pc); - dsp_reg_store_stack(3, cnt); - } -} - - -// BLOOP $R, addrA -// 0000 0000 011r rrrr -// aaaa aaaa aaaa aaaa -// Repeatedly execute block of code starting at following opcode until -// counter specified by value from register $R reaches zero. Block ends at -// specified address addrA inclusive, ie. opcode at addrA is the last opcode -// included in loop. Counter is pushed on loop stack $st3, end of block address -// is pushed on loop stack $st2 and repeat address is pushed on call stack $st0. -// Up to 4 nested loops are allowed. -void bloop(const UDSPInstruction opc) -{ - u16 reg = opc & 0x1f; - u16 cnt = dsp_op_read_reg(reg); - u16 loop_pc = dsp_fetch_code(); - - if (cnt) - { - dsp_reg_store_stack(0, g_dsp.pc); - dsp_reg_store_stack(2, loop_pc); - dsp_reg_store_stack(3, cnt); - } - else - { - g_dsp.pc = loop_pc; - dsp_skip_inst(); - } -} - -// BLOOPI #I, addrA -// 0001 0001 iiii iiii -// aaaa aaaa aaaa aaaa -// Repeatedly execute block of code starting at following opcode until -// counter specified by immediate value I reaches zero. Block ends at specified -// address addrA inclusive, ie. opcode at addrA is the last opcode included in -// loop. Counter is pushed on loop stack $st3, end of block address is pushed -// on loop stack $st2 and repeat address is pushed on call stack $st0. Up to 4 -// nested loops are allowed. -void bloopi(const UDSPInstruction opc) -{ - u16 cnt = opc & 0xff; - u16 loop_pc = dsp_fetch_code(); - - if (cnt) - { - dsp_reg_store_stack(0, g_dsp.pc); - dsp_reg_store_stack(2, loop_pc); - dsp_reg_store_stack(3, cnt); - } - else - { - g_dsp.pc = loop_pc; - dsp_skip_inst(); - } -} - -} // namespace |