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Fix Thumb BLX (imm), BL (imm) for negative immediates

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This commit is contained in:
MerryMage 2016-07-18 22:48:23 +01:00
parent 3f11a149d7
commit 95588d3faa
2 changed files with 18 additions and 2 deletions
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4
src/frontend/translate/translate_thumb.cpp
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@ -789,7 +789,7 @@ struct ThumbTranslatorVisitor final {
}
bool thumb32_BL_imm(Imm11 hi, Imm11 lo) {
s32 imm32 = Common::SignExtend<32, s32>((hi << 12) | (lo << 1));
s32 imm32 = Common::SignExtend<23, s32>((hi << 12) | (lo << 1));
// BL <label>
ir.SetRegister(Reg::LR, ir.Imm32((ir.current_location.arm_pc + 4) | 1));
auto new_location = ir.current_location;
@ -799,7 +799,7 @@ struct ThumbTranslatorVisitor final {
}
bool thumb32_BLX_imm(Imm11 hi, Imm11 lo) {
s32 imm32 = Common::SignExtend<32, s32>((hi << 12) | (lo << 1));
s32 imm32 = Common::SignExtend<23, s32>((hi << 12) | (lo << 1));
if ((lo & 1) != 0) {
return UnpredictableInstruction();
}

16
tests/arm/test_thumb_instructions.cpp
View file

@ -152,3 +152,19 @@ TEST_CASE( "thumb: bl +#234584", "[thumb]" ) {
REQUIRE( jit.Regs()[15] == 0x39458 );
REQUIRE( jit.Cpsr() == 0x00000030 ); // Thumb, User-mode
}
TEST_CASE( "thumb: bl -#42", "[thumb]" ) {
Dynarmic::Jit jit{GetUserCallbacks()};
code_mem.fill({});
code_mem[0] = 0xF7FF; code_mem[1] = 0xFFE9; // bl -#42
code_mem[2] = 0xE7FE; // b +#0
jit.Regs()[15] = 0; // PC = 0
jit.Cpsr() = 0x00000030; // Thumb, User-mode
jit.Run(1);
REQUIRE( jit.Regs()[14] == (0x4 | 1) );
REQUIRE( jit.Regs()[15] == 0xFFFFFFD6 );
REQUIRE( jit.Cpsr() == 0x00000030 ); // Thumb, User-mode
}