diff options
| -rw-r--r-- | disasm.cpp | 25 | ||||
| -rw-r--r-- | test.bash | 7 |
2 files changed, 26 insertions, 6 deletions
@@ -1552,11 +1552,26 @@ static void disasm_mulu_muls( return disasm_verbatim(node, instr, code, s); } -static void disasm_exg( - DisasmNode &node, uint16_t instr, const DataBuffer &code, const Settings &s) +static inline void disasm_exg(DisasmNode &node, uint16_t instr) { - // TODO Implement - return disasm_verbatim(node, instr, code, s); + assert((instr & 0x130) == 0x100); + const int m1 = (instr >> 3) & 1; + const int m2 = (instr >> 6) & 3; + assert(m2 != 0); // Therefore m == 0 and m == 1 are impossible + assert(m2 != 3); // Therefore m == 6 and m == 7 are impossible + const int m = (m2 << 1) | m1; + assert(m != 4); // Only m == 2, m == 3 and m == 5 values are allowed + const int xn = instr & 7; + const int xi = (instr >> 9) & 7; + const auto src = (m == 3) ? AddrModeArg::An(xi) : AddrModeArg::Dn(xi); + const auto dst = (m == 2) ? AddrModeArg::Dn(xn) : AddrModeArg::An(xn); + char src_str[32]{}; + char dst_str[32]{}; + src.SNPrint(src_str, sizeof(src_str)); + dst.SNPrint(dst_str, sizeof(dst_str)); + snprintf(node.mnemonic, kMnemonicBufferSize, "exg"); + snprintf(node.arguments, kArgsBufferSize, "%s,%s", src_str, dst_str); + node.size = kInstructionSizeStepBytes + src.Size() + dst.Size(); } static void disasm_chunk_c( @@ -1575,7 +1590,7 @@ static void disasm_chunk_c( } const unsigned m_split = instr & 0x1f8; if (m_split == 0x188 || m_split == 0x148 || m_split == 0x140) { - return disasm_exg(node, instr, code, s); + return disasm_exg(node, instr); } return disasm_or_and(node, instr, code, s, opsize, "and"); } @@ -93,6 +93,12 @@ run_test_iterative() { done } +# cxxx exg +# +run_test_simple "exg Dn, Dn" "\xcd\x41" +run_test_simple "exg Dn, An" "\xcd\x89" +run_test_simple "exg An, An" "\xcd\x49" + # cxxx and # run_test_simple "andb Dn, Dn" "\xc4\x01" @@ -104,7 +110,6 @@ run_test_simple "andw -(An), Dn" "\xc4\x61" run_test_simple "andl (d8,PC,An), Dn" "\xc0\xbb\xc8\x07" # GNU AS would emit ANDI for "and #imm,Xn", so we diassemble it as short run_test_expect_short "andl #imm, D6" "\xc6\xbc\x44\xd1\xe6\xe9" -run_test_expect_short "andl D2, D0 swapped direction" "\xc1\x42" # cxxx abcd # |