diff options
| author | hrydgard <hrydgard@gmail.com> | 2009-04-12 10:21:40 +0000 |
|---|---|---|
| committer | hrydgard <hrydgard@gmail.com> | 2009-04-12 10:21:40 +0000 |
| commit | e8b9e93465ec9e78de823c1480439f9efb2a8012 (patch) | |
| tree | b8e70742317f9e558111d1324ecdc824df1837ad /Source/Core/DSPCore/Src/DSPAnalyzer.cpp | |
| parent | 2b2c2afa3cb7f5e556f719069052feb703b2c1e6 (diff) | |
DSP: Move the LLE core to a library. Added DSP assembler from gdtool, start cleaning it up. Create a new program called "DSPTool" which will become a more up to date replacement for gdtool from the devkitpro, automatically incorporating all our findings as we make them. This program depends on the new library. It can *ALMOST* roundtrip (asm->disasm->asm) hermes' DSP mixer at this point. Sorry about the unfinished Sconscript work - I'll fix it soon if nobody else does it first.
git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@2955 8ced0084-cf51-0410-be5f-012b33b47a6e
Diffstat (limited to 'Source/Core/DSPCore/Src/DSPAnalyzer.cpp')
| -rw-r--r-- | Source/Core/DSPCore/Src/DSPAnalyzer.cpp | 126 |
1 files changed, 126 insertions, 0 deletions
diff --git a/Source/Core/DSPCore/Src/DSPAnalyzer.cpp b/Source/Core/DSPCore/Src/DSPAnalyzer.cpp new file mode 100644 index 0000000000..c182fa33c8 --- /dev/null +++ b/Source/Core/DSPCore/Src/DSPAnalyzer.cpp @@ -0,0 +1,126 @@ +// Copyright (C) 2003-2009 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/
+
+#include "DSPAnalyzer.h"
+#include "DSPInterpreter.h"
+#include "DSPTables.h"
+#include "gdsp_memory.h"
+
+namespace DSPAnalyzer {
+
+// Holds data about all instructions in RAM.
+u8 code_flags[ISPACE];
+
+// Good candidates for idle skipping is mail wait loops. If we're time slicing
+// between the main CPU and the DSP, if the DSP runs into one of these, it might
+// as well give up its time slice immediately, after executing once.
+
+// Max signature length is 6. A 0 in a signature is ignored.
+#define NUM_IDLE_SIGS 4
+#define MAX_IDLE_SIG_SIZE 6
+
+// 0xFFFF means ignore.
+const u16 idle_skip_sigs[NUM_IDLE_SIGS][MAX_IDLE_SIG_SIZE + 1] =
+{
+ { 0x26fc, // LRS $30, @DMBH
+ 0x02c0, 0x8000, // ANDCF $30, #0x8000
+ 0x029d, 0xFFFF, // JLZ 0x027a
+ 0, 0 }, // RET
+ { 0x27fc, // LRS $31, @DMBH
+ 0x03c0, 0x8000, // ANDCF $31, #0x8000
+ 0x029d, 0xFFFF, // JLZ 0x027a
+ 0, 0 }, // RET
+ { 0x26fe, // LRS $30, @CMBH
+ 0x02c0, 0x8000, // ANDCF $30, #0x8000
+ 0x029c, 0xFFFF, // JLNZ 0x0280
+ 0, 0 }, // RET
+ { 0x27fe, // LRS $31, @CMBH
+ 0x03c0, 0x8000, // ANDCF $31, #0x8000
+ 0x029c, 0xFFFF, // JLNZ 0x0280
+ 0, 0 }, // RET
+};
+
+void Reset()
+{
+ memset(code_flags, 0, sizeof(code_flags));
+}
+
+void AnalyzeRange(int start_addr, int end_addr)
+{
+ // First we run an extremely simplified version of a disassembler to find
+ // where all instructions start.
+
+ // This may not be 100% accurate in case of jump tables!
+ // It could get desynced, which would be bad. We'll see if that's an issue.
+ int addr = start_addr;
+ while (addr < end_addr)
+ {
+ UDSPInstruction inst = dsp_imem_read(addr);
+ const DSPOPCTemplate *opcode = GetOpTemplate(inst);
+ if (!opcode)
+ {
+ addr++;
+ continue;
+ }
+ code_flags[addr] |= CODE_START_OF_INST;
+ addr += opcode->size;
+
+ // Look for loops.
+ if ((inst.hex & 0xffe0) == 0x0060 || (inst.hex & 0xff00) == 0x1100) {
+ // BLOOP, BLOOPI
+ u16 loop_end = dsp_imem_read(addr + 1);
+ code_flags[loop_end] |= CODE_LOOP_END;
+ } else if ((inst.hex & 0xffe0) == 0x0040 || (inst.hex & 0xff00) == 0x1000) {
+ // LOOP, LOOPI
+ code_flags[addr + 1] |= CODE_LOOP_END;
+ }
+ }
+
+ // Next, we'll scan for potential idle skips.
+ for (int s = 0; s < NUM_IDLE_SIGS; s++)
+ {
+ for (int addr = start_addr; addr < end_addr; addr++)
+ {
+ bool found = false;
+ for (int i = 0; i < MAX_IDLE_SIG_SIZE + 1; i++)
+ {
+ if (idle_skip_sigs[s][i] == 0)
+ found = true;
+ if (idle_skip_sigs[s][i] == 0xFFFF)
+ continue;
+ if (idle_skip_sigs[s][i] != dsp_imem_read(addr + i))
+ break;
+ }
+ if (found)
+ {
+ NOTICE_LOG(DSPLLE, "Idle skip location found at %02x", addr);
+ code_flags[addr] |= CODE_IDLE_SKIP;
+ // TODO: actually use this flag somewhere.
+ }
+ }
+ }
+ NOTICE_LOG(DSPLLE, "Finished analysis.");
+}
+
+void Analyze()
+{
+ Reset();
+ AnalyzeRange(0x0000, 0x1000); // IRAM
+ AnalyzeRange(0x8000, 0x9000); // IROM
+}
+
+} // namespace
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