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Diffstat (limited to 'src/devices/cpu/cops1/cops1d.cpp')
-rw-r--r--src/devices/cpu/cops1/cops1d.cpp188
1 files changed, 188 insertions, 0 deletions
diff --git a/src/devices/cpu/cops1/cops1d.cpp b/src/devices/cpu/cops1/cops1d.cpp
new file mode 100644
index 00000000000..0d20a0f0370
--- /dev/null
+++ b/src/devices/cpu/cops1/cops1d.cpp
@@ -0,0 +1,188 @@
+// license:BSD-3-Clause
+// copyright-holders:hap
+/*
+
+ National Semiconductor COPS(MM57 MCU family) disassembler
+
+*/
+
+#include "emu.h"
+#include "cops1d.h"
+
+// constructor
+
+cops1_common_disassembler::cops1_common_disassembler()
+{
+ // init lfsr pc lut
+ for (u32 i = 0, pc = 0; i < 0x40; i++)
+ {
+ m_l2r[i] = pc;
+ m_r2l[pc] = i;
+ pc = increment_pc(pc);
+ }
+}
+
+offs_t cops1_common_disassembler::increment_pc(offs_t pc)
+{
+ u8 feed = (pc & 0x3f) == 0 || ((pc >> 1 ^ pc) & 1) ? 0x20 : 0;
+ return (pc & ~0x3f) | (pc >> 1 & 0x1f) | feed;
+}
+
+
+// common lookup tables
+
+const char *const cops1_common_disassembler::s_name[] =
+{
+ "?",
+ "AD", "ADD", "SUB", "COMP", "0TA", "ADX", "HXA", "TAM", "SC", "RSC", "TC",
+ "TIN", "TF", "TKB", "TIR",
+ "BTD", "DSPA", "DSPS", "AXO", "LDF", "READ",
+ "GO", "CALL", "RET", "RETS", "LG/GO", "LG/CALL", "NOP",
+ "EXC", "EXCM", "EXCP", "MTA", "LM",
+ "SM", "SM", "SM", "SM", "RSM", "RSM", "RSM", "RSM", "TM",
+ "LB", "LBL", "ATB", "BTA", "HXBR"
+};
+
+// bitmask for opcode parameter
+const u8 cops1_common_disassembler::s_bits[] =
+{
+ 0,
+ 0, 0, 0, 0, 0, 0x0f, 0, 0, 0, 0, 0,
+ 0, 0x30, 0, 0,
+ 0, 0, 0, 0, 0xff, 0,
+ 0x3f, 0x3f, 0, 0, 0xff, 0xff, 0,
+ 0x30, 0x30, 0x30, 0x30, 0x0f,
+ 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03,
+ 0x3f, 0xff, 0, 0, 0
+};
+
+const u32 cops1_common_disassembler::s_flags[] =
+{
+ 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0,
+ 0, STEP_OVER, STEP_OUT, STEP_OUT, 0, STEP_OVER, 0,
+ 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0
+};
+
+
+// common disasm
+
+offs_t cops1_common_disassembler::common_disasm(const u8 *lut_opmap, std::ostream &stream, offs_t pc, const data_buffer &opcodes, const data_buffer &params)
+{
+ // get raw opcode
+ u8 op = opcodes.r8(pc);
+ u8 instr = lut_opmap[op];
+ int len = 1;
+
+ // get parameter
+ u8 mask = s_bits[instr];
+ u16 param = op & mask;
+
+ if (mask == 0x30)
+ {
+ mask >>= 4;
+ param >>= 4;
+ }
+
+ // 2-byte instructions
+ else if (mask == 0xff)
+ {
+ pc = increment_pc(pc);
+ u8 arg = params.r8(pc);
+ len++;
+
+ if (instr == em_LG)
+ {
+ // bit 6 indicates GO or CALL
+ if (~arg & 0x40)
+ instr++;
+
+ param = (~param << 7 & 0x780) | (arg >> 1 & 0x40) | (arg & 0x3f);
+ }
+ else
+ param = arg;
+ }
+
+ // disassemble it
+ util::stream_format(stream, "%-8s ", s_name[instr]);
+ if (mask > 0)
+ {
+ if (mask < 16)
+ {
+ // SM and RSM param is scrambled
+ if (instr >= em_SM1 && instr <= em_SM8)
+ param = instr - em_SM1;
+ else if (instr >= em_RSM1 && instr <= em_RSM8)
+ param = instr - em_RSM1;
+
+ // memory bit opcodes are 1,2,4,8
+ if (instr >= em_SM1 && instr <= em_TM)
+ param = 1 << param;
+
+ // TF is 1,2,3,4
+ else if (instr == em_TF)
+ param++;
+
+ // EXC type instructions omit param if it's 0
+ if (!(param == 0 && (instr == em_EXC || instr == em_EXCM || instr == em_EXCP || instr == em_MTA)))
+ util::stream_format(stream, "%d", param);
+ }
+ else
+ {
+ // exception for LG
+ if (instr == em_LG || instr == em_LGCALL)
+ util::stream_format(stream, "$%02X,$%02X", param >> 6, param & 0x3f);
+
+ // exception for LB/LBL
+ else if (instr == em_LB || instr == em_LBL)
+ {
+ // LB x,10 is 0 by default
+ if (instr == em_LB && (param & 0xf) == 10)
+ param &= 0x30;
+
+ util::stream_format(stream, "%d,%d", param >> 4, param & 0xf);
+ }
+
+ else
+ util::stream_format(stream, "$%02X", param);
+ }
+ }
+
+ return len | s_flags[instr] | SUPPORTED;
+}
+
+
+// MM5799 disasm
+
+const u8 mm5799_disassembler::mm5799_opmap[0x100] =
+{
+/* 0 1 2 3 4 5 6 7 8 9 A B C D E F */
+ em_NOP, em_HXBR, em_ADD, em_SC, em_TF, em_TIR, em_MTA, em_EXC, em_EXCM, em_EXCP, em_LB, em_LB, em_LB, em_LB, em_LB, em_LB, // 0
+ em_DSPA, em_DSPS, em_AD, em_LBL, em_TF, em_TKB, em_MTA, em_EXC, em_EXCM, em_EXCP, em_LB, em_LB, em_LB, em_LB, em_LB, em_LB, // 1
+ em_COMP, em_AXO, em_SUB, em_RSC, em_TF, em_BTD, em_MTA, em_EXC, em_EXCM, em_EXCP, em_LB, em_LB, em_LB, em_LB, em_LB, em_LB, // 2
+ em_0TA, em_HXA, em_TAM, em_LDF, em_READ, em_TIN, em_MTA, em_EXC, em_EXCM, em_EXCP, em_LB, em_LB, em_LB, em_LB, em_LB, em_LB, // 3
+
+ em_RET, em_RETS, em_RSM8, em_BTA, em_TM, em_TM, em_TM, em_TM, em_RSM1, em_SM1, em_SM8, em_RSM4, em_RSM2, em_TC, em_SM2, em_SM4, // 4
+ em_ATB, em_ADX, em_ADX, em_ADX, em_ADX, em_ADX, em_ADX, em_ADX, em_ADX, em_ADX, em_ADX, em_ADX, em_ADX, em_ADX, em_ADX, em_ADX, // 5
+ em_LG, em_LG, em_LG, em_LG, em_LG, em_LG, em_LG, em_LG, em_LG, em_LG, em_LG, em_LG, em_LG, em_LG, em_LG, em_LG, // 6
+ em_LM, em_LM, em_LM, em_LM, em_LM, em_LM, em_LM, em_LM, em_LM, em_LM, em_LM, em_LM, em_LM, em_LM, em_LM, em_LM, // 7
+
+ em_CALL, em_CALL, em_CALL, em_CALL, em_CALL, em_CALL, em_CALL, em_CALL, em_CALL, em_CALL, em_CALL, em_CALL, em_CALL, em_CALL, em_CALL, em_CALL, // 8
+ em_CALL, em_CALL, em_CALL, em_CALL, em_CALL, em_CALL, em_CALL, em_CALL, em_CALL, em_CALL, em_CALL, em_CALL, em_CALL, em_CALL, em_CALL, em_CALL, // 9
+ em_CALL, em_CALL, em_CALL, em_CALL, em_CALL, em_CALL, em_CALL, em_CALL, em_CALL, em_CALL, em_CALL, em_CALL, em_CALL, em_CALL, em_CALL, em_CALL, // A
+ em_CALL, em_CALL, em_CALL, em_CALL, em_CALL, em_CALL, em_CALL, em_CALL, em_CALL, em_CALL, em_CALL, em_CALL, em_CALL, em_CALL, em_CALL, em_CALL, // B
+
+ em_GO, em_GO, em_GO, em_GO, em_GO, em_GO, em_GO, em_GO, em_GO, em_GO, em_GO, em_GO, em_GO, em_GO, em_GO, em_GO, // C
+ em_GO, em_GO, em_GO, em_GO, em_GO, em_GO, em_GO, em_GO, em_GO, em_GO, em_GO, em_GO, em_GO, em_GO, em_GO, em_GO, // D
+ em_GO, em_GO, em_GO, em_GO, em_GO, em_GO, em_GO, em_GO, em_GO, em_GO, em_GO, em_GO, em_GO, em_GO, em_GO, em_GO, // E
+ em_GO, em_GO, em_GO, em_GO, em_GO, em_GO, em_GO, em_GO, em_GO, em_GO, em_GO, em_GO, em_GO, em_GO, em_GO, em_GO // F
+};
+
+offs_t mm5799_disassembler::disassemble(std::ostream &stream, offs_t pc, const data_buffer &opcodes, const data_buffer &params)
+{
+ return common_disasm(mm5799_opmap, stream, pc, opcodes, params);
+}