From 6f593da41b77322ce82c2e9f770693b006e13de3 Mon Sep 17 00:00:00 2001 From: Lioncash Date: Mon, 1 Feb 2021 16:47:12 -0500 Subject: [PATCH] thumb32: Implement SSUB8/USUB8 --- src/frontend/A32/decoder/thumb32.h | 4 +-- .../A32/translate/impl/thumb32_parallel.cpp | 28 +++++++++++++++++++ .../A32/translate/impl/translate_thumb.h | 2 ++ tests/A32/fuzz_thumb.cpp | 4 +++ 4 files changed, 36 insertions(+), 2 deletions(-) diff --git a/src/frontend/A32/decoder/thumb32.h b/src/frontend/A32/decoder/thumb32.h index 0371e1e3..dce4b27f 100644 --- a/src/frontend/A32/decoder/thumb32.h +++ b/src/frontend/A32/decoder/thumb32.h @@ -240,7 +240,7 @@ std::optional>> DecodeThumb32(u32 INST(&V::thumb32_SSAX, "SSAX", "111110101110nnnn1111dddd0000mmmm"), INST(&V::thumb32_SSUB16, "SSUB16", "111110101101nnnn1111dddd0000mmmm"), INST(&V::thumb32_SADD8, "SADD8", "111110101000nnnn1111dddd0000mmmm"), - //INST(&V::thumb32_SSUB8, "SSUB8", "111110101100----1111----0000----"), + INST(&V::thumb32_SSUB8, "SSUB8", "111110101100nnnn1111dddd0000mmmm"), //INST(&V::thumb32_QADD16, "QADD16", "111110101001----1111----0001----"), //INST(&V::thumb32_QASX, "QASX", "111110101010----1111----0001----"), //INST(&V::thumb32_QSAX, "QSAX", "111110101110----1111----0001----"), @@ -260,7 +260,7 @@ std::optional>> DecodeThumb32(u32 INST(&V::thumb32_USAX, "USAX", "111110101110nnnn1111dddd0100mmmm"), INST(&V::thumb32_USUB16, "USUB16", "111110101101nnnn1111dddd0100mmmm"), INST(&V::thumb32_UADD8, "UADD8", "111110101000nnnn1111dddd0100mmmm"), - //INST(&V::thumb32_USUB8, "USUB8", "111110101100----1111----0100----"), + INST(&V::thumb32_USUB8, "USUB8", "111110101100nnnn1111dddd0100mmmm"), //INST(&V::thumb32_UQADD16, "UQADD16", "111110101001----1111----0101----"), //INST(&V::thumb32_UQASX, "UQASX", "111110101010----1111----0101----"), //INST(&V::thumb32_UQSAX, "UQSAX", "111110101110----1111----0101----"), diff --git a/src/frontend/A32/translate/impl/thumb32_parallel.cpp b/src/frontend/A32/translate/impl/thumb32_parallel.cpp index fea76338..6db7ebe1 100644 --- a/src/frontend/A32/translate/impl/thumb32_parallel.cpp +++ b/src/frontend/A32/translate/impl/thumb32_parallel.cpp @@ -63,6 +63,20 @@ bool ThumbTranslatorVisitor::thumb32_SSAX(Reg n, Reg d, Reg m) { return true; } +bool ThumbTranslatorVisitor::thumb32_SSUB8(Reg n, Reg d, Reg m) { + if (d == Reg::PC || n == Reg::PC || m == Reg::PC) { + return UnpredictableInstruction(); + } + + const auto reg_m = ir.GetRegister(m); + const auto reg_n = ir.GetRegister(n); + const auto result = ir.PackedSubS8(reg_n, reg_m); + + ir.SetRegister(d, result.result); + ir.SetGEFlags(result.ge); + return true; +} + bool ThumbTranslatorVisitor::thumb32_SSUB16(Reg n, Reg d, Reg m) { if (d == Reg::PC || n == Reg::PC || m == Reg::PC) { return UnpredictableInstruction(); @@ -133,6 +147,20 @@ bool ThumbTranslatorVisitor::thumb32_USAX(Reg n, Reg d, Reg m) { return true; } +bool ThumbTranslatorVisitor::thumb32_USUB8(Reg n, Reg d, Reg m) { + if (d == Reg::PC || n == Reg::PC || m == Reg::PC) { + return UnpredictableInstruction(); + } + + const auto reg_m = ir.GetRegister(m); + const auto reg_n = ir.GetRegister(n); + const auto result = ir.PackedSubU8(reg_n, reg_m); + + ir.SetRegister(d, result.result); + ir.SetGEFlags(result.ge); + return true; +} + bool ThumbTranslatorVisitor::thumb32_USUB16(Reg n, Reg d, Reg m) { if (d == Reg::PC || n == Reg::PC || m == Reg::PC) { return UnpredictableInstruction(); diff --git a/src/frontend/A32/translate/impl/translate_thumb.h b/src/frontend/A32/translate/impl/translate_thumb.h index e2c52c18..8a01ec3e 100644 --- a/src/frontend/A32/translate/impl/translate_thumb.h +++ b/src/frontend/A32/translate/impl/translate_thumb.h @@ -133,11 +133,13 @@ struct ThumbTranslatorVisitor final { bool thumb32_SADD16(Reg n, Reg d, Reg m); bool thumb32_SASX(Reg n, Reg d, Reg m); bool thumb32_SSAX(Reg n, Reg d, Reg m); + bool thumb32_SSUB8(Reg n, Reg d, Reg m); bool thumb32_SSUB16(Reg n, Reg d, Reg m); bool thumb32_UADD8(Reg n, Reg d, Reg m); bool thumb32_UADD16(Reg n, Reg d, Reg m); bool thumb32_UASX(Reg n, Reg d, Reg m); bool thumb32_USAX(Reg n, Reg d, Reg m); + bool thumb32_USUB8(Reg n, Reg d, Reg m); bool thumb32_USUB16(Reg n, Reg d, Reg m); }; diff --git a/tests/A32/fuzz_thumb.cpp b/tests/A32/fuzz_thumb.cpp index ee730459..d031ef47 100644 --- a/tests/A32/fuzz_thumb.cpp +++ b/tests/A32/fuzz_thumb.cpp @@ -422,6 +422,8 @@ TEST_CASE("Fuzz Thumb32 instructions set", "[JitX64][Thumb][Thumb32]") { three_reg_not_r15), ThumbInstGen("111110101110nnnn1111dddd0000mmmm", // SSAX three_reg_not_r15), + ThumbInstGen("111110101100nnnn1111dddd0000mmmm", // SSUB8 + three_reg_not_r15), ThumbInstGen("111110101101nnnn1111dddd0000mmmm", // SSUB16 three_reg_not_r15), ThumbInstGen("111110101000nnnn1111dddd0100mmmm", // UADD8 @@ -432,6 +434,8 @@ TEST_CASE("Fuzz Thumb32 instructions set", "[JitX64][Thumb][Thumb32]") { three_reg_not_r15), ThumbInstGen("111110101110nnnn1111dddd0100mmmm", // USAX three_reg_not_r15), + ThumbInstGen("111110101100nnnn1111dddd0100mmmm", // USUB8 + three_reg_not_r15), ThumbInstGen("111110101101nnnn1111dddd0100mmmm", // USUB16 three_reg_not_r15), };