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|
// license:BSD-3-Clause
// copyright-holders:Vas Crabb
/*
Epson C33 disassembler
TODO:
* Only C33 ADV Core is currently supported - add support for C33 STD Core, C33 PE Core, etc.
* Reconstruct more assembler synthetics
* Should psrset and psrclr use symbolic names for bits?
* Should 32-bit extended displacements always be displayed as signed?
* Should loop instructions have friendlier syntax?
*/
#include "emu.h"
#include "c33dasm.h"
#include <tuple>
#include <utility>
namespace {
char const *const special_reg_names[16] = {
"%psr",
"%sp",
"%alr",
"%ahr",
"%lco",
"%lca",
"%lea",
"%sor",
"%ttbr",
"%dp",
"%idir",
"%dbbr",
nullptr,
"%usp",
"%ssp",
"%pc" };
std::pair<char const *, unsigned> const class_0_00_ops[32] = {
{ "nop", 0 }, // 000 0000 0 00 00
{ "slp", 0 }, // 000 0000 0 01 00
{ "halt", 0 }, // 000 0000 0 10 00
{ nullptr, 0 },
{ nullptr, 0 },
{ nullptr, 0 },
{ nullptr, 0 },
{ nullptr, 0 },
{ "pushn %%r%1$u", 4 }, // 000 0001 0 00 00
{ "popn %%r%1$u", 4 }, // 000 0001 0 01 00
{ nullptr, 0 },
{ "jpr %%r%1$u", 4 }, // 000 0001 0 11 00
{ nullptr, 0 },
{ nullptr, 0 },
{ nullptr, 0 },
{ "jpr.d %%r%1$u", 4 }, // 000 0001 1 11 00
{ "brk", 0 }, // 000 0010 0 00 00
{ "retd", 0 }, // 000 0010 0 01 00
{ "int %1$u", 2 }, // 000 0010 0 10 00
{ "reti", 0 }, // 000 0010 0 11 00
{ nullptr, 0 },
{ nullptr, 0 },
{ nullptr, 0 },
{ nullptr, 0 },
{ "call %%r%1$u", 4 }, // 000 0011 0 00 00
{ "ret", 0 }, // 000 0011 0 01 00
{ "jp %%r%1$u", 4 }, // 000 0011 0 10 00
{ "retm", 0 }, // 000 0011 0 11 00
{ "call.d %%r%1$u", 4 }, // 000 0011 1 00 00
{ "ret.d", 0 }, // 000 0011 1 01 00
{ "jp.d %%r%1$u", 4 }, // 000 0011 1 10 00
{ nullptr, 0 } };
std::tuple<char const *, char const *, char const *, bool, bool> const class_0_01_ops[32] = {
{ "push %%r%1$u", nullptr, nullptr, false, false }, // 000 0000 000 01
{ "pop %%r%1$u", nullptr, nullptr, false, false }, // 000 0000 001 01
{ "pushs %%r%3$s", nullptr, nullptr, true, false }, // 000 0000 010 01
{ "pops %%r%3$s", nullptr, nullptr, true, false }, // 000 0000 011 01
{ "mac.w %%r%1$u", nullptr, nullptr, false, false }, // 000 0000 100 01
{ "mac.hw %%r%1$u", nullptr, nullptr, false, false }, // 000 0000 101 01
{ "macclr", nullptr, nullptr, false, true }, // 000 0000 110 01
{ "ld.cf", nullptr, nullptr, false, true }, // 000 0000 111 01
{ "divu.w %%r%1$u", nullptr, nullptr, false, false }, // 000 0001 000 01
{ "div.w %%r%1$u", nullptr, nullptr, false, false }, // 000 0001 001 01
{ "repeat %%r%1$u", nullptr, nullptr, false, false }, // 000 0001 010 01
{ "repeat %1$u", nullptr, nullptr, false, false }, // 000 0001 011 01
{ nullptr, nullptr, nullptr, false, false },
{ "add %%r%1$u,%%dp", "xadd %%r%1$u,%%dp,0x%2$x", "xadd %%r%1$u,%%dp,%%r%2$u", false, false }, // 000 0001 101 01
{ nullptr, nullptr, nullptr, false, false },
{ nullptr, nullptr, nullptr, false, false },
{ nullptr, nullptr, nullptr, false, false },
{ nullptr, nullptr, nullptr, false, false },
{ nullptr, nullptr, nullptr, false, false },
{ nullptr, nullptr, nullptr, false, false },
{ nullptr, nullptr, nullptr, false, false },
{ nullptr, nullptr, nullptr, false, false },
{ nullptr, nullptr, nullptr, false, false },
{ nullptr, nullptr, nullptr, false, false },
{ nullptr, nullptr, nullptr, false, false },
{ nullptr, nullptr, nullptr, false, false },
{ nullptr, nullptr, nullptr, false, false },
{ nullptr, nullptr, nullptr, false, false },
{ nullptr, nullptr, nullptr, false, false },
{ nullptr, nullptr, nullptr, false, false },
{ nullptr, nullptr, nullptr, false, false },
{ nullptr, nullptr, nullptr, false, false } };
std::pair<char const *, char const *> const class_0_jumps[16] = {
{ nullptr, nullptr },
{ nullptr, nullptr },
{ nullptr, nullptr },
{ nullptr, nullptr },
{ "jrgt%1$s 0x%2$x", "xjrgt%1$s 0x%2$x" }, // 000 0100
{ "jrge%1$s 0x%2$x", "xjrge%1$s 0x%2$x" }, // 000 0101
{ "jrlt%1$s 0x%2$x", "xjrlt%1$s 0x%2$x" }, // 000 0110
{ "jrle%1$s 0x%2$x", "xjrle%1$s 0x%2$x" }, // 000 0111
{ "jrugt%1$s 0x%2$x", "xjrugt%1$s 0x%2$x" }, // 000 1000
{ "jruge%1$s 0x%2$x", "xjruge%1$s 0x%2$x" }, // 000 1001
{ "jrult%1$s 0x%2$x", "xjrult%1$s 0x%2$x" }, // 000 1010
{ "jrule%1$s 0x%2$x", "xjrule%1$s 0x%2$x" }, // 000 1011
{ "jreq%1$s 0x%2$x", "xjreq%1$s 0x%2$x" }, // 000 1100
{ "jrne%1$s 0x%2$x", "xjrne%1$s 0x%2$x" }, // 000 1101
{ "call%1$s 0x%2$x", "xcall%1$s 0x%2$x" }, // 000 1110
{ "jp%1$s 0x%2$x", "xjp%1$s 0x%2$x" } }; // 000 1111
std::tuple<char const *, char const *, char const *> const class_1_ops[32] = {
{ "ld.b %%r%1$u,[%%r%2$u]", "xld.b %%r%1$u,[%%r%2$u + 0x%4$x]", "xld.b %%r%1$u,[%%r%2$u + %%r%4$u]" }, // 001 000 00
{ "ld.b %%r%1$u,[%%r%2$u]+", nullptr, nullptr }, // 001 000 01
{ "add %%r%1$u,%%r%2$u", "xadd %%r%1$u,%%r%2$u,0x%4$x", "xadd %%r%1$u,%%r%2$u,%%r%4$u" }, // 001 000 10
{ "srl %%r%1$u,%3$u", nullptr, "xsrl %%r%1$u,%%r%4$u,%3$u" }, // 001 000 11
{ "ld.ub %%r%1$u,[%%r%2$u]", "xld.ub %%r%1$u,[%%r%2$u + 0x%4$x]", "xld.ub %%r%1$u,[%%r%2$u + %%r%4$u]" }, // 001 001 00
{ "ld.ub %%r%1$u,[%%r%2$u]+", nullptr, nullptr }, // 001 001 01
{ "sub %%r%1$u,%%r%2$u", "xsub %%r%1$u,%%r%2$u,0x%4$x", "xsub %%r%1$u,%%r%2$u,%%r%4$u" }, // 001 001 10
{ "sll %%r%1$u,%3$u", nullptr, "xsll %%r%1$u,%%r%4$u,%3$u" }, // 001 001 11
{ "ld.h %%r%1$u,[%%r%2$u]", "xld.h %%r%1$u,[%%r%2$u + 0x%4$x]", "xld.h %%r%1$u,[%%r%2$u + %%r%4$u]" }, // 001 010 00
{ "ld.h %%r%1$u,[%%r%2$u]+", nullptr, nullptr }, // 001 010 01
{ "cmp %%r%1$u,%%r%2$u", nullptr, nullptr }, // 001 010 10
{ "sra %%r%1$u,%3$u", nullptr, "xsra %%r%1$u,%%r%4$u,%3$u" }, // 001 010 11
{ "ld.uh %%r%1$u,[%%r%2$u]", "xld.uh %%r%1$u,[%%r%2$u + 0x%4$x]", "xld.uh %%r%1$u,[%%r%2$u + %%r%4$u]" }, // 001 011 00
{ "ld.uh %%r%1$u,[%%r%2$u]+", nullptr, nullptr }, // 001 011 01
{ "ld.w %%r%1$u,%%r%2$u", nullptr, nullptr }, // 001 011 10
{ "sla %%r%1$u,%3$u", nullptr, "xsla %%r%1$u,%%r%4$u,%3$u" }, // 001 011 11
{ "ld.w %%r%1$u,[%%r%2$u]", "xld.w %%r%1$u,[%%r%2$u + 0x%4$x]", "xld.w %%r%1$u,[%%r%2$u + %%r%4$u]" }, // 001 100 00
{ "ld.w %%r%1$u,[%%r%2$u]+", nullptr, nullptr }, // 001 100 01
{ "and %%r%1$u,%%r%2$u", "xand %%r%1$u,%%r%2$u,0x%4$x", "xand %%r%1$u,%%r%2$u,%%r%4$u" }, // 001 100 10
{ "rr %%r%1$u,%3$u", nullptr, "xrr %%r%1$u,%%r%4$u,%3$u" }, // 001 100 11
{ "ld.b [%%r%2$u],%%r%1$u", "xld.b [%%r%2$u + 0x%4$x],%%r%1$u", "xld.b [%%r%2$u + %%r%4$u],%%r%1$u" }, // 001 101 00
{ "ld.b [%%r%2$u]+,%%r%1$u", nullptr, nullptr }, // 001 101 01
{ "or %%r%1$u,%%r%2$u", "xoor %%r%1$u,%%r%2$u,0x%4$x", "xoor %%r%1$u,%%r%2$u,%%r%4$u" }, // 001 101 10
{ "rl %%r%1$u,%3$u", nullptr, "xrl %%r%1$u,%%r%4$u,%3$u" }, // 001 101 11
{ "ld.h [%%r%2$u],%%r%1$u", "xld.h [%%r%2$u + 0x%4$x],%%r%1$u", "xld.h [%%r%2$u + %%r%4$u],%%r%1$u" }, // 001 110 00
{ "ld.h [%%r%2$u]+,%%r%1$u", nullptr, nullptr }, // 001 110 01
{ "xor %%r%1$u,%%r%2$u", "xxor %%r%1$u,%%r%2$u,0x%4$x", "xxor %%r%1$u,%%r%2$u,%%r%4$u" }, // 001 110 10
{ nullptr, nullptr, nullptr },
{ "ld.w [%%r%2$u],%%r%1$u", "xld.w [%%r%2$u + 0x%4$x],%%r%1$u", "xld.w [%%r%2$u + %%r%4$u],%%r%1$u" }, // 001 111 00
{ "ld.w [%%r%2$u]+,%%r%1$u", nullptr, nullptr }, // 001 111 01
{ "not %%r%1$u,%%r%2$u", nullptr, nullptr }, // 001 111 10
{ nullptr, nullptr, nullptr } };
char const *const class_1_ext_shifts[4] = {
nullptr,
"ext sra,%1$u", // 001 110 11 0000 01
"ext srl,%1$u", // 001 110 11 0000 10
"ext sll,%1$u" }; // 001 110 11 0000 11
char const *const class_1_ext_predicates[16] = {
nullptr,
nullptr,
nullptr,
nullptr,
"ext gt", // 001 110 11 0100
"ext ge", // 001 110 11 0101
"ext lt", // 001 110 11 0110
"ext le", // 001 110 11 0111
"ext ugt", // 001 110 11 1000
"ext uge", // 001 110 11 1001
"ext ult", // 001 110 11 1010
"ext ule", // 001 110 11 1011
"ext eq", // 001 110 11 1100
"ext ne", // 001 110 11 1101
nullptr,
nullptr };
std::pair<char const *, bool> class_1_ext_3[4] = {
{ "ext %%r%1$u", true },
{ "ext %%r%1$u,sra,%2$u", false },
{ "ext %%r%1$u,srl,%2$u", false },
{ "ext %%r%1$u,sll,%2$u", false } };
std::tuple<char const *, char const *, unsigned> const class_2_3_ops[16] = {
{ "ld.b %%r%1$u,[%%sp + 0x%2$x]", "xld.b %%r%1$u,[%%sp + 0x%2$x]", 1 }, // 010 000
{ "ld.ub %%r%1$u,[%%sp + 0x%2$x]", "xld.ub %%r%1$u,[%%sp + 0x%2$x]", 1 }, // 010 001
{ "ld.h %%r%1$u,[%%sp + 0x%2$x]", "xld.h %%r%1$u,[%%sp + 0x%2$x]", 2 }, // 010 010
{ "ld.uh %%r%1$u,[%%sp + 0x%2$x]", "xld.uh %%r%1$u,[%%sp + 0x%2$x]", 2 }, // 010 011
{ "ld.w %%r%1$u,[%%sp + 0x%2$x]", "xld.w %%r%1$u,[%%sp + 0x%2$x]", 4 }, // 010 100
{ "ld.b [%%sp + 0x%2$x],%%r%1$u", "xld.b [%%sp + 0x%2$x],%%r%1$u", 1 }, // 010 101
{ "ld.h [%%sp + 0x%2$x],%%r%1$u", "xld.h [%%sp + 0x%2$x],%%r%1$u", 2 }, // 010 110
{ "ld.w [%%sp + 0x%2$x],%%r%1$u", "xld.w [%%sp + 0x%2$x],%%r%1$u", 4 }, // 010 111
{ "add %%r%1$u,0x%2$x", "xadd %%r%1$u,0x%2$x", 1 }, // 011 000
{ "sub %%r%1$u,0x%2$x", "xsub %%r%1$u,0x%2$x", 1 }, // 011 001
{ "cmp %%r%1$u,%5$s0x%4$x", "xcmp %%r%1$u,%5$s0x%4$x", 1 }, // 011 010
{ "ld.w %%r%1$u,%5$s0x%4$x", "xld.w %%r%1$u,%5$s0x%4$x", 1 }, // 011 011
{ "and %%r%1$u,0x%3$x", "xand %%r%1$u,0x%3$x", 1 }, // 011 100
{ "or %%r%1$u,0x%3$x", "xoor %%r%1$u,0x%3$x", 1 }, // 011 101
{ "xor %%r%1$u,0x%3$x", "xxor %%r%1$u,0x%3$x", 1 }, // 011 110
{ "not %%r%1$u,0x%3$x", "xnot %%r%1$u,0x%3$x", 1 } }; // 011 111
std::tuple<char const *, char const *, bool> const class_4_ops[32] = {
{ nullptr, nullptr, false },
{ nullptr, nullptr, false },
{ nullptr, nullptr, false },
{ nullptr, nullptr, false },
{ nullptr, nullptr, false },
{ nullptr, nullptr, false },
{ nullptr, nullptr, false },
{ nullptr, nullptr, false },
{ "srl %%r%1$u,%2$u", "xsrl %%r%1$u,%%r%3$u,%2$u", false }, // 100 010 00
{ "srl %%r%1$u,%%r%2$u", "xsrl %%r%1$u,%%r%3$u,%%r%2$u", false }, // 100 010 01
{ "scan0 %%r%1$u,%%r%2$u", nullptr, false }, // 100 010 10
{ "div0s %%r%2$u", nullptr, true }, // 100 010 11
{ "sll %%r%1$u,%2$u", "xsll %%r%1$u,%%r%3$u,%2$u", false }, // 100 011 00
{ "sll %%r%1$u,%%r%2$u", "xsll %%r%1$u,%%r%3$u,%%r%2$u", false }, // 100 011 01
{ "scan1 %%r%1$u,%%r%2$u", nullptr, false }, // 100 011 10
{ "div0u %%r%2$u", nullptr, true }, // 100 011 11
{ "sra %%r%1$u,%2$u", "xsra %%r%1$u,%%r%3$u,%2$u", false }, // 100 100 00
{ "sra %%r%1$u,%%r%2$u", "xsra %%r%1$u,%%r%3$u,%%r%2$u", false }, // 100 100 01
{ "swap %%r%1$u,%%r%2$u", nullptr, false }, // 100 100 10
{ "div1 %%r%2$u", nullptr, true }, // 100 100 11
{ "sla %%r%1$u,%2$u", "xsla %%r%1$u,%%r%3$u,%2$u", false }, // 100 101 00
{ "sla %%r%1$u,%%r%2$u", "xsla %%r%1$u,%%r%3$u,%%r%2$u", false }, // 100 101 01
{ "mirror %%r%1$u,%%r%2$u", nullptr, false }, // 100 101 10
{ "div2s %%r%2$u", nullptr, true }, // 100 101 11
{ "rr %%r%1$u,%2$u", "xrr %%r%1$u,%%r%3$u,%2$u", false }, // 100 110 00
{ "rr %%r%1$u,%%r%2$u", "xrr %%r%1$u,%%r%3$u,%%r%2$u", false }, // 100 110 01
{ "swaph %%r%1$u,%%r%2$u", nullptr, false }, // 100 110 10
{ "div3s %%r%2$u", nullptr, true }, // 100 110 11
{ "rl %%r%1$u,%2$u", "xrl %%r%1$u,%%r%3$u,%2$u", false }, // 100 111 00
{ "rl %%r%1$u,%%r%2$u", "xrl %%r%1$u,%%r%3$u,%%r%2$u", false }, // 100 111 01
{ "sat.b %%r%1$u,%%r%2$u", nullptr, false }, // 100 111 10
{ "sat.ub %%r%1$u,%%r%2$u", nullptr, false } }; // 100 111 11
std::tuple<char const *, char const *, char const *, unsigned, unsigned> const class_5_ops[32] = {
{ "ld.w %4$s,%%r%2$d", nullptr, nullptr, 4, 1 }, // 101 000 00
{ "ld.b %%r%1$u,%%r%2$u", nullptr, nullptr, 4, 0 }, // 101 000 01
{ "mlt.h %%r%1$u,%%r%2$u", nullptr, nullptr, 4, 0 }, // 101 000 10
{ "mlt.hw %%r%1$u,%%r%2$u", nullptr, nullptr, 4, 0 }, // 101 000 11
{ "ld.w %%r%1$d,%4$s", nullptr, nullptr, 4, 2 }, // 101 001 00
{ "ld.ub %%r%1$u,%%r%2$u", nullptr, nullptr, 4, 0 }, // 101 001 01
{ "mltu.h %%r%1$u,%%r%2$u", nullptr, nullptr, 4, 0 }, // 101 001 10
{ "mac1.h %%r%1$u,%%r%2$u", nullptr, nullptr, 4, 0 }, // 101 001 11
{ "btst [%%r%2$u],%1$u", "xbtst [%%r%2$u + 0x%3$x],%1$u", nullptr, 3, 0 }, // 101 010 00
{ "ld.h %%r%1$u,%%r%2$u", nullptr, nullptr, 4, 0 }, // 101 010 01
{ "mlt.w %%r%1$u,%%r%2$u", nullptr, nullptr, 4, 0 }, // 101 010 10
{ "mac1.hw %%r%1$u,%%r%2$u", nullptr, nullptr, 4, 0 }, // 101 010 11
{ "bclr [%%r%2$u],%1$u", "xbclr [%%r%2$u + 0x%3$x],%1$u", nullptr, 3, 0 }, // 101 011 00
{ "ld.uh %%r%1$u,%%r%2$u", nullptr, nullptr, 4, 0 }, // 101 011 01
{ "mltu.w %%r%1$u,%%r%2$u", nullptr, nullptr, 4, 0 }, // 101 011 10
{ nullptr, nullptr, nullptr, 0, 0 },
{ "bset [%%r%2$u],%1$u", "xbset [%%r%2$u + 0x%3$x],%1$u", nullptr, 3, 0 }, // 101 100 00
{ "ld.c %%r%1$u,0x%2$x", nullptr, nullptr, 4, 0 }, // 101 100 01
{ "mac %%r%2$u", nullptr, nullptr, 0, 0 }, // 101 100 10
{ "mac1.w %%r%1$u,%%r%2$u", nullptr, nullptr, 4, 0 }, // 101 100 11
{ "bnot [%%r%2$u],%1$u", "xbnot [%%r%2$u + 0x%3$x],%1$u", nullptr, 3, 0 }, // 101 101 00
{ "ld.c 0x%2$x,%%r%1$u", nullptr, nullptr, 4, 0 }, // 101 101 01
{ "sat.h %%r%1$u,%%r%2$u", nullptr, nullptr, 4, 0 }, // 101 101 10
{ "sat.uh %%r%1$u,%%r%2$u", nullptr, nullptr, 4, 0 }, // 101 101 11
{ "adc %%r%1$u,%%r%2$u", nullptr, "xadc %%r%1$u,%%r%2$u,%%r%3$u", 4, 0 }, // 101 110 00
{ "loop %%r%1$u,%%r%2$u", nullptr, nullptr, 4, 0 }, // 101 110 01
{ "loop %%r%1$u,%2$u", nullptr, nullptr, 4, 0 }, // 101 110 10
{ "loop %1$u,%2$u", nullptr, nullptr, 4, 0 }, // 101 110 11
{ "sbc %%r%1$u,%%r%2$u", nullptr, "xsbc %%r%1$u,%%r%2$u,%%r%3$u", 4, 0 }, // 101 111 00
{ "sat.w %%r%1$u,%%r%2$u", nullptr, nullptr, 4, 0 }, // 101 111 01
{ "sat.uw %%r%1$u,%%r%2$u", nullptr, nullptr, 4, 0 }, // 101 111 10
{ nullptr, nullptr, nullptr, 0, 0 } };
std::tuple<char const *, char const *, unsigned> const class_7_ops[8] = {
{ "ld.b %%r%1$u,[%%dp + 0x%2$x]", "xld.b %%r%1$u,[%%dp + 0x%2$x]", 1 }, // 111 000
{ "ld.ub %%r%1$u,[%%dp + 0x%2$x]", "xld.ub %%r%1$u,[%%dp + 0x%2$x]", 1 }, // 111 001
{ "ld.h %%r%1$u,[%%dp + 0x%2$x]", "xld.h %%r%1$u,[%%dp + 0x%2$x]", 2 }, // 111 010
{ "ld.uh %%r%1$u,[%%dp + 0x%2$x]", "xld.uh %%r%1$u,[%%dp + 0x%2$x]", 2 }, // 111 011
{ "ld.w %%r%1$u,[%%dp + 0x%2$x]", "xld.w %%r%1$u,[%%dp + 0x%2$x]", 4 }, // 111 100
{ "ld.b [%%dp + 0x%2$x],%%r%1$u", "xld.b [%%dp + 0x%2$x],%%r%1$u", 1 }, // 111 101
{ "ld.h [%%dp + 0x%2$x],%%r%1$u", "xld.h [%%dp + 0x%2$x],%%r%1$u", 2 }, // 111 110
{ "ld.w [%%dp + 0x%2$x],%%r%1$u", "xld.w [%%dp + 0x%2$x],%%r%1$u", 4 } }; // 111 111
} // anonymous namespace
struct c33_disassembler::ext_info
{
offs_t size() const
{
switch (type)
{
case ext_type::NONE:
return 0;
case ext_type::IMM13:
return 2;
case ext_type::IMM26:
return 4;
case ext_type::REG:
return 2;
}
throw false; // something is very wrong if we get here
}
unsigned bits() const
{
switch (type)
{
case ext_type::NONE:
return 0;
case ext_type::IMM13:
return 13;
case ext_type::IMM26:
return 26;
case ext_type::REG:
return 4;
}
throw false; // something is very wrong if we get here
}
char const *inst(char const *base, char const *ext_imm, char const *ext_reg) const
{
switch (type)
{
case ext_type::NONE:
return base;
case ext_type::IMM13:
case ext_type::IMM26:
return ext_imm;
case ext_type::REG:
return ext_reg;
}
throw false; // something is very wrong if we get here
}
ext_type type = ext_type::NONE;
u32 val = 0;
u16 op = 0;
};
c33_disassembler::c33_disassembler()
{
}
u32 c33_disassembler::opcode_alignment() const
{
return 2;
}
offs_t c33_disassembler::disassemble(
std::ostream &stream,
offs_t pc,
data_buffer const &opcodes,
data_buffer const ¶ms)
{
u16 op;
ext_info ext;
op = opcodes.r16(pc);
if (BIT(op, 13, 3) == 6)
{
ext.type = ext_type::IMM13;
ext.val = BIT(op, 0, 13);
ext.op = op;
op = opcodes.r16(pc + 2);
if (BIT(op, 13, 3) == 6)
{
ext.type = ext_type::IMM26;
ext.val = (ext.val << 13) | BIT(op, 0, 13);
op = opcodes.r16(pc + 4);
}
}
else if ((op & 0b111'111'11'0000'1111) == 0b001'111'11'0000'0000)
{
ext.type = ext_type::REG;
ext.val = BIT(op, 4, 4);
ext.op = op;
op = opcodes.r16(pc + 2);
}
return dasm(stream, pc, op, ext);
}
offs_t c33_disassembler::dasm(std::ostream &stream, offs_t pc, u16 op, ext_info const &ext) const
{
switch (BIT(op, 13, 3))
{
case 0:
if (offs_t const r = dasm_class_0(stream, pc, op, ext); r)
return r;
break;
case 1:
if (offs_t const r = dasm_class_1(stream, op, ext); r)
return r;
break;
case 2:
case 3:
if (offs_t const r = dasm_class_2_3(stream, op, ext); r)
return r;
break;
case 4:
if (offs_t const r = dasm_class_4(stream, op, ext); r)
return r;
break;
case 5:
if (offs_t const r = dasm_class_5(stream, op, ext); r)
return r;
break;
case 6:
if (offs_t const r = dasm_class_6(stream, op, ext); r)
return r;
break;
case 7:
if (offs_t const r = dasm_class_7(stream, op, ext); r)
return r;
break;
};
if (ext_type::NONE != ext.type)
return dasm(stream, pc, ext.op, ext_info());
stream << "<invalid>";
return 2;
}
offs_t c33_disassembler::dasm_class_0(std::ostream &stream, offs_t pc, u16 op, ext_info const &ext) const
{
switch (BIT(op, 9, 4))
{
case 0b0000:
case 0b0001:
case 0b0010:
case 0b0011:
if (BIT(op, 4, 2) == 0)
{
auto const [inst, target_bits] = class_0_00_ops[BIT(op, 6, 5)];
if (inst && ((4 == target_bits) || !BIT(op, target_bits, 4 - target_bits)))
{
if (ext_type::NONE != ext.type)
return 0;
util::stream_format(stream, inst, BIT(op, 0, 4));
return 2;
}
}
else if (BIT(op, 4, 2) == 1)
{
auto const [inst, inst_ext_imm, inst_ext_reg, use_special_reg, no_arg] = class_0_01_ops[BIT(op, 6, 5)];
char const *const special_reg = use_special_reg ? special_reg_names[BIT(op, 0, 4)] : nullptr;
if (inst && (!use_special_reg || special_reg) && (!no_arg || !BIT(op, 0, 4)))
{
char const *const fmt = ext.inst(inst, inst_ext_imm, inst_ext_reg);
if (!fmt)
return 0;
util::stream_format(stream, fmt, BIT(op, 0, 4), ext.val, special_reg);
return 2 + ext.size();
}
}
break;
default:
{
auto const [inst, inst_ext_imm] = class_0_jumps[BIT(op, 9, 5)];
char const *const fmt = ext.inst(inst, inst_ext_imm, nullptr);
if (!fmt)
return 0;
s32 imm = (BIT(ext.val, 16, 10) << 22) | (BIT(ext.val, 0, 13) << 9) | (BIT(op, 0, 8) << 1);
if (ext_type::NONE == ext.type)
imm = util::sext(imm, 9);
else if (ext_type::IMM13 == ext.type)
imm = util::sext(imm, 22);
util::stream_format(stream, fmt, BIT(op, 8) ? ".d" : " ", pc + ext.size() + imm);
return 2 + ext.size();
}
}
return 0; // catch invalid forms
}
offs_t c33_disassembler::dasm_class_1(std::ostream &stream, u16 op, ext_info const &ext) const
{
switch (BIT(op, 8, 5))
{
case 0b110'11:
if (!BIT(op, 4, 4))
{
char const *const inst = class_1_ext_shifts[BIT(op, 2, 2)];
if (inst)
{
if (ext_type::NONE != ext.type)
return 0;
util::stream_format(stream, inst, BIT(op, 0, 2));
return 2;
}
}
else
{
char const *const inst = class_1_ext_predicates[BIT(op, 4, 4)];
if (inst && !BIT(op, 0, 4))
{
if (ext_type::NONE != ext.type)
return 0;
stream << inst;
return 2;
}
}
break;
case 0b111'11:
{
auto const [inst, no_imm] = class_1_ext_3[BIT(op, 2, 2)];
if (!no_imm || !BIT(op, 0, 2))
{
if (ext_type::NONE != ext.type)
return 0;
util::stream_format(stream, inst, BIT(op, 4, 4), BIT(op, 0, 2));
return 2;
}
}
break;
default:
{
auto const [inst, inst_ext_imm, inst_ext_reg] = class_1_ops[BIT(op, 8, 5)];
char const *const fmt = ext.inst(inst, inst_ext_imm, inst_ext_reg);
if (!fmt)
return 0;
util::stream_format(stream, fmt, BIT(op, 0, 4), BIT(op, 4, 4), 0x10 | BIT(op, 4, 4), ext.val);
return 2 + ext.size();
}
}
return 0; // catch invalid ext forms
}
offs_t c33_disassembler::dasm_class_2_3(std::ostream &stream, u16 op, ext_info const &ext) const
{
auto const [inst, inst_ext_imm, mul] = class_2_3_ops[BIT(op, 10, 4)];
char const *const fmt = ext.inst(inst, inst_ext_imm, nullptr);
if (!fmt)
return 0;
u8 const reg = BIT(op, 0, 4);
u32 imm = (ext.val << 6) | BIT(op, 4, 6);
s32 simm = util::sext(imm, 6 + ext.bits());
u32 abs = std::abs(simm);
char const *const sign = (0 > simm) ? "-" : "";
if (ext_type::NONE == ext.type)
{
imm *= mul;
simm *= mul;
abs *= mul;
}
util::stream_format(stream, fmt, reg, imm, simm, abs, sign);
return 2 + ext.size();
}
offs_t c33_disassembler::dasm_class_4(std::ostream &stream, u16 op, ext_info const &ext) const
{
if (BIT(op, 11, 2) == 0)
{
if (ext_type::NONE != ext.type)
return 0;
util::stream_format(stream, BIT(op, 10) ? "sub %%sp,0x%1$x" : "add %%sp,0x%1$x", BIT(op, 0, 10) * 4);
return 2;
}
else
{
auto const [inst, inst_ext_reg, no_dest] = class_4_ops[BIT(op, 8, 5)];
if (!no_dest || !BIT(op, 0, 4))
{
char const *const fmt = ext.inst(inst, nullptr, inst_ext_reg);
if (!fmt)
return 0;
util::stream_format(stream, fmt, BIT(op, 0, 4), BIT(op, 4, 4), ext.val);
return 2 + ext.size();
}
}
return 0; // catch invalid forms of division instructions
}
offs_t c33_disassembler::dasm_class_5(std::ostream &stream, u16 op, ext_info const &ext) const
{
if (BIT(op, 6, 7) == 0b111'11'00)
{
if (ext_type::NONE != ext.type)
return 0;
util::stream_format(stream, "do.c 0x%1$x", BIT(op, 0, 6));
return 2;
}
else if (BIT(op, 5, 8) == 0b111'11'01'0)
{
if (ext_type::NONE != ext.type)
return 0;
util::stream_format(stream, "psrset %1$u", BIT(op, 0, 5));
return 2;
}
else if (BIT(op, 5, 8) == 0b111'11'10'0)
{
if (ext_type::NONE != ext.type)
return 0;
util::stream_format(stream, "psrclr %1$u", BIT(op, 0, 5));
return 2;
}
else
{
auto const [inst, inst_ext_imm, inst_ext_reg, target_bits, special_reg_pos] = class_5_ops[BIT(op, 8, 5)];
char const *const special_reg = special_reg_pos ? special_reg_names[BIT(op, (special_reg_pos - 1) * 4, 4)] : nullptr;
if (inst && (!special_reg_pos || special_reg) && ((4 == target_bits) || !BIT(op, target_bits, 4 - target_bits)))
{
char const *const fmt = ext.inst(inst, inst_ext_imm, inst_ext_reg);
if (!fmt)
return 0;
util::stream_format(stream, fmt, BIT(op, 0, 4), BIT(op, 4, 4), ext.val, special_reg);
return 2 + ext.size();
}
}
return 0; // catch invalid forms
}
offs_t c33_disassembler::dasm_class_6(std::ostream &stream, u16 op, ext_info const &ext) const
{
if (ext_type::NONE != ext.type)
return 0;
util::stream_format(stream, "ext 0x%1$x", BIT(op, 0, 13));
return 2;
}
offs_t c33_disassembler::dasm_class_7(std::ostream &stream, u16 op, ext_info const &ext) const
{
auto const [inst, inst_ext_imm, mul] = class_7_ops[BIT(op, 10, 3)];
char const *const fmt = ext.inst(inst, inst_ext_imm, nullptr);
if (!fmt)
return 0;
u8 const reg = BIT(op, 0, 4);
u32 imm = (ext.val << 6) | BIT(op, 4, 6);
if (ext_type::NONE == ext.type)
imm *= mul;
util::stream_format(stream, fmt, reg, imm);
return 2 + ext.size();
}
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