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Adding instruction table and basic PPC state.

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Can decode a single instruction.
This commit is contained in:
Ben Vanik
2013-01-13 21:25:28 -08:00
parent 099e37490a
commit bfec194533
12 changed files with 715 additions and 3 deletions
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68
src/cpu/ppc/instr.cc Normal file
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/**
******************************************************************************
* Xenia : Xbox 360 Emulator Research Project *
******************************************************************************
* Copyright 2013 Ben Vanik. All rights reserved. *
* Released under the BSD license - see LICENSE in the root for more details. *
******************************************************************************
*/
#include <xenia/cpu/ppc/instr.h>
#include "cpu/ppc/instr_table.h"
xe_ppc_instr_type_t *xe_ppc_get_instr_type(uint32_t code) {
xe_ppc_instr_type_t *slot = NULL;
switch (code >> 26) {
case 4:
// Opcode = 4, index = bits 5-0 (6)
slot = &xe_ppc_instr_table_4[XESELECTBITS(code, 0, 5)];
break;
case 19:
// Opcode = 19, index = bits 10-1 (10)
slot = &xe_ppc_instr_table_19[XESELECTBITS(code, 1, 10)];
break;
case 30:
// Opcode = 30, index = bits 5-1 (5)
slot = &xe_ppc_instr_table_30[XESELECTBITS(code, 1, 5)];
break;
case 31:
// Opcode = 31, index = bits 10-1 (10)
slot = &xe_ppc_instr_table_31[XESELECTBITS(code, 1, 10)];
break;
case 58:
// Opcode = 58, index = bits 1-0 (2)
slot = &xe_ppc_instr_table_58[XESELECTBITS(code, 0, 1)];
break;
case 59:
// Opcode = 59, index = bits 5-1 (5)
slot = &xe_ppc_instr_table_59[XESELECTBITS(code, 1, 5)];
break;
case 62:
// Opcode = 62, index = bits 1-0 (2)
slot = &xe_ppc_instr_table_62[XESELECTBITS(code, 0, 1)];
break;
case 63:
// Opcode = 63, index = bits 10-1 (10)
slot = &xe_ppc_instr_table_63[XESELECTBITS(code, 1, 10)];
break;
default:
slot = &xe_ppc_instr_table[XESELECTBITS(code, 26, 31)];
break;
}
if (!slot || !slot->opcode) {
return NULL;
}
return slot;
}
int xe_ppc_register_instr_emit(uint32_t code, xe_ppc_emit_fn emit) {
xe_ppc_instr_type_t *instr_type = xe_ppc_get_instr_type(code);
if (!instr_type) {
return 1;
}
XEASSERTNULL(instr_type->emit);
instr_type->emit = emit;
return 0;
}