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Implement thumb1_SUB_imm

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This commit is contained in:
MerryMage 2016-07-08 20:57:53 +08:00
parent a2e40eb922
commit 34be20e4d6
3 changed files with 18 additions and 2 deletions
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4
src/frontend/decoder/thumb1.h
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@ -56,7 +56,7 @@ private:
};
template <typename V>
static const std::array<Thumb1Matcher<V>, 13> g_thumb1_instruction_table {{
static const std::array<Thumb1Matcher<V>, 14> g_thumb1_instruction_table {{
#define INST(fn, name, bitstring) detail::detail<Thumb1Matcher, u16, 16>::GetMatcher<decltype(fn), fn>(name, bitstring)
@ -67,7 +67,7 @@ static const std::array<Thumb1Matcher<V>, 13> g_thumb1_instruction_table {{
{ INST(&V::thumb1_ADD_reg_t1, "ADD (reg, T1)", "0001100mmmnnnddd") },
{ INST(&V::thumb1_SUB_reg, "SUB (reg)", "0001101mmmnnnddd") },
{ INST(&V::thumb1_ADD_imm, "ADD (imm)", "0001110vvvnnnddd") },
//{ INST(&V::thumb1_SUB_rri, "SUB (rri)", "0001111mmmnnnddd") },
{ INST(&V::thumb1_SUB_imm, "SUB (imm)", "0001111vvvnnnddd") },
//{ INST(&V::thumb1_MOV_ri, "MOV (ri)", "00100dddvvvvvvvv") },
//{ INST(&V::thumb1_CMP_ri, "CMP (ri)", "00101dddvvvvvvvv") },
//{ INST(&V::thumb1_ADD_ri, "ADD (ri)", "00110dddvvvvvvvv") },

4
src/frontend/disassembler_thumb.cpp
View file

@ -126,6 +126,10 @@ public:
return Common::StringFromFormat("adds %s, %s, #%u", RegStr(d), RegStr(n), imm3);
}
std::string thumb1_SUB_imm(Imm3 imm3, Reg n, Reg d) {
return Common::StringFromFormat("subs %s, %s, #%u", RegStr(d), RegStr(n), imm3);
}
std::string thumb1_AND_reg(Reg m, Reg d_n) {
return Common::StringFromFormat("ands %s, %s", RegStr(d_n), RegStr(m));
}

12
src/frontend/translate_thumb.cpp
View file

@ -98,6 +98,18 @@ struct TranslatorVisitor final {
ir.SetVFlag(result.overflow);
return true;
}
bool thumb1_SUB_imm(Imm3 imm3, Reg n, Reg d) {
u32 imm32 = imm3 & 0x7;
// SUBS <Rd>, <Rn>, #<imm3>
// Rd can never encode R15.
auto result = ir.SubWithCarry(ir.GetRegister(n), ir.Imm32(imm32), ir.Imm1(1));
ir.SetRegister(d, result.result);
ir.SetNFlag(ir.MostSignificantBit(result.result));
ir.SetZFlag(ir.IsZero(result.result));
ir.SetCFlag(result.carry);
ir.SetVFlag(result.overflow);
return true;
}
bool thumb1_AND_reg(Reg m, Reg d_n) {
const Reg d = d_n, n = d_n;