diff options
Diffstat (limited to 'src/devices/cpu/dspp/dsppdasm.cpp')
| -rw-r--r-- | src/devices/cpu/dspp/dsppdasm.cpp | 124 |
1 files changed, 124 insertions, 0 deletions
diff --git a/src/devices/cpu/dspp/dsppdasm.cpp b/src/devices/cpu/dspp/dsppdasm.cpp new file mode 100644 index 00000000000..6b43df5d452 --- /dev/null +++ b/src/devices/cpu/dspp/dsppdasm.cpp @@ -0,0 +1,124 @@ +// license:BSD-3-Clause +// copyright-holders:Philip Bennett +/*************************************************************************** + + dsppdasm.c + Disassembler for the portable DSPP emulator. + +***************************************************************************/ + +#include "emu.h" +#include "dspp.h" +#include "dsppdasm.h" + + +/*************************************************************************** + CODE CODE +***************************************************************************/ + +uint32_t dspp_disassembler::opcode_alignment() const +{ + return 2; +} + +offs_t dspp_disassembler::disassemble(std::ostream &stream, offs_t pc, const data_buffer &opcodes, const data_buffer ¶ms) +{ +#if 0 + uint32_t op = oprom[0] | (oprom[1] << 8) | (oprom[2] << 16) | (oprom[3] << 24); + int opcode = op >> 27; + int cond = (op >> 21) & 1; + int rdst = (op >> 22) & 31; + int rsrc1 = (op >> 16) & 31; + int rsrc2 = op & 0xffff; + int rsrc2_iszero = (!rsrc2 || rsrc2 == 0xffe0); + uint32_t flags = 0; + + switch (opcode) + { + case 0x00: sprintf(buffer, "trap $00"); flags = DASMFLAG_STEP_OVER; break; + case 0x01: sprintf(buffer, "b%s $%08x", condition[rdst & 15], pc + ((INT32)(op << 10) >> 8)); break; + case 0x02: if ((op & 0x003fffff) == 3) + { + uint32_t nextop = oprom[4] | (oprom[5] << 8) | (oprom[6] << 16) | (oprom[7] << 24); + if ((nextop >> 27) == 0x10 && ((nextop >> 22) & 31) == rdst && (nextop & 0xffff) == 0) + { + uint32_t nextnextop = oprom[8] | (oprom[9] << 8) | (oprom[10] << 16) | (oprom[11] << 24); + sprintf(buffer, "llit%s $%08x,%s", setcond[cond], nextnextop, reg[rdst]); + return 12 | DASMFLAG_STEP_OVER | DASMFLAG_SUPPORTED; + } + } + if (rdst) + { + flags = DASMFLAG_STEP_OVER | DASMFLAG_STEP_OVER_EXTRA(1); + sprintf(buffer, "bsr %s,$%08x", reg[rdst], pc + ((INT32)(op << 10) >> 8)); + } + else + sprintf(buffer, "bra $%08x", pc + ((INT32)(op << 10) >> 8)); + break; + case 0x03: sprintf(buffer, "lea%s %s[%s],%s", setcond[cond], reg[rsrc1], src2(op,2), reg[rdst]); break; + case 0x04: sprintf(buffer, "leah%s %s[%s],%s", setcond[cond], reg[rsrc1], src2(op,1), reg[rdst]); break; + case 0x05: sprintf(buffer, "subr%s %s,%s,%s", setcond[cond], reg[rsrc1], src2(op,0), reg[rdst]); break; + case 0x06: sprintf(buffer, "xor%s %s,%s,%s", setcond[cond], reg[rsrc1], src2(op,0), reg[rdst]); break; + case 0x07: sprintf(buffer, "xorn%s %s,%s,%s", setcond[cond], reg[rsrc1], src2(op,0), reg[rdst]); break; + case 0x08: if (!rsrc1 && !rdst && rsrc2_iszero) + sprintf(buffer, "nop"); + else if (!rsrc1) + sprintf(buffer, "mov%s %s,%s", setcond[cond], src2(op,0), reg[rdst]); + else if (rsrc2_iszero) + sprintf(buffer, "mov%s %s,%s", setcond[cond], reg[rsrc1], reg[rdst]); + else + sprintf(buffer, "add%s %s,%s,%s", setcond[cond], reg[rsrc1], src2(op,0), reg[rdst]); break; + case 0x09: sprintf(buffer, "sub%s %s,%s,%s", setcond[cond], reg[rsrc1], src2(op,0), reg[rdst]); break; + case 0x0a: sprintf(buffer, "addc%s %s,%s,%s", setcond[cond], reg[rsrc1], src2(op,0), reg[rdst]); break; + case 0x0b: sprintf(buffer, "subc%s %s,%s,%s", setcond[cond], reg[rsrc1], src2(op,0), reg[rdst]); break; + case 0x0c: sprintf(buffer, "and%s %s,%s,%s", setcond[cond], reg[rsrc1], src2(op,0), reg[rdst]); break; + case 0x0d: sprintf(buffer, "andn%s %s,%s,%s", setcond[cond], reg[rsrc1], src2(op,0), reg[rdst]); break; + case 0x0e: if (!rsrc1 && !rdst && rsrc2_iszero) + sprintf(buffer, "nop"); + else if (!rsrc1) + sprintf(buffer, "mov%s %s,%s", setcond[cond], src2(op,0), reg[rdst]); + else if (rsrc2_iszero) + sprintf(buffer, "mov%s %s,%s", setcond[cond], reg[rsrc1], reg[rdst]); + else + sprintf(buffer, "or%s %s,%s,%s", setcond[cond], reg[rsrc1], src2(op,0), reg[rdst]); break; + case 0x0f: sprintf(buffer, "orn%s %s,%s,%s", setcond[cond], reg[rsrc1], src2(op,0), reg[rdst]); break; + case 0x10: sprintf(buffer, "ld%s %s[%s],%s", setcond[cond], reg[rsrc1], src2(op,2), reg[rdst]); break; + case 0x11: sprintf(buffer, "ldh%s %s[%s],%s", setcond[cond], reg[rsrc1], src2(op,1), reg[rdst]); break; + case 0x12: sprintf(buffer, "lduh%s %s[%s],%s", setcond[cond], reg[rsrc1], src2(op,1), reg[rdst]); break; + case 0x13: sprintf(buffer, "sth%s %s[%s],%s", setcond[cond], reg[rsrc1], src2(op,1), reg[rdst]); break; + case 0x14: sprintf(buffer, "st%s %s[%s],%s", setcond[cond], reg[rsrc1], src2(op,2), reg[rdst]); break; + case 0x15: sprintf(buffer, "ldb%s %s[%s],%s", setcond[cond], reg[rsrc1], src2(op,0), reg[rdst]); break; + case 0x16: sprintf(buffer, "ldub%s %s[%s],%s", setcond[cond], reg[rsrc1], src2(op,0), reg[rdst]); break; + case 0x17: sprintf(buffer, "stb%s %s[%s],%s", setcond[cond], reg[rsrc1], src2(op,0), reg[rdst]); break; + case 0x18: sprintf(buffer, "ashr%s %s,%s,%s", setcond[cond], reg[rsrc1], src2(op,0), reg[rdst]); break; + case 0x19: sprintf(buffer, "lshr%s %s,%s,%s", setcond[cond], reg[rsrc1], src2(op,0), reg[rdst]); break; + case 0x1a: sprintf(buffer, "ashl%s %s,%s,%s", setcond[cond], reg[rsrc1], src2(op,0), reg[rdst]); break; + case 0x1b: sprintf(buffer, "rotl%s %s,%s,%s", setcond[cond], reg[rsrc1], src2(op,0), reg[rdst]); break; + case 0x1c: sprintf(buffer, "getps %s", reg[rdst]); break; + case 0x1d: sprintf(buffer, "putps %s", src2(op,0)); break; + case 0x1e: if (rdst && rsrc2_iszero) + { + flags = DASMFLAG_STEP_OVER | DASMFLAG_STEP_OVER_EXTRA(1); + sprintf(buffer, "jsr%s %s,%s", setcond[cond], reg[rdst], reg[rsrc1]); + } + else if (rdst) + { + flags = DASMFLAG_STEP_OVER | DASMFLAG_STEP_OVER_EXTRA(1); + sprintf(buffer, "jsr%s %s,%s[%s]", setcond[cond], reg[rdst], reg[rsrc1], src2(op,2)); + } + else if (rsrc2_iszero) + { + if (rsrc1 == 28) + flags = DASMFLAG_STEP_OUT; + sprintf(buffer, "jmp%s %s", setcond[cond], reg[rsrc1]); + } + else + sprintf(buffer, "jmp%s %s[%s]", setcond[cond], reg[rsrc1], src2(op,2)); + break; + case 0x1f: sprintf(buffer, "trap $1f"); flags = DASMFLAG_STEP_OVER; break; + } + + sprintf(buffer, "????"); +#endif + return 4 | 2 | SUPPORTED; +} |