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| author | Pavel Pisa <pisa@cmp.felk.cvut.cz> | 2019-03-13 13:53:30 +0100 |
|---|---|---|
| committer | Pavel Pisa <pisa@cmp.felk.cvut.cz> | 2019-03-13 13:53:30 +0100 |
| commit | 4637416160771a6357bd8bebf61626ca599c500b (patch) | |
| tree | 19cee938bed0b88aa037fdc821ce62a6e1a30fa3 /qtmips_machine | |
| parent | 92e0df65f7d46eac5115d54d31a7807fc2faa8fb (diff) | |
| download | qtmips-4637416160771a6357bd8bebf61626ca599c500b.tar.gz qtmips-4637416160771a6357bd8bebf61626ca599c500b.tar.bz2 qtmips-4637416160771a6357bd8bebf61626ca599c500b.zip | |
Fix LB and LH sign extension and LH/SH mask calculation.
Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
Diffstat (limited to 'qtmips_machine')
| -rw-r--r-- | qtmips_machine/memory.cpp | 8 | ||||
| -rw-r--r-- | qtmips_machine/tests/testcore.cpp | 4 | ||||
| -rw-r--r-- | qtmips_machine/tests/testmemory.cpp | 4 |
3 files changed, 8 insertions, 8 deletions
diff --git a/qtmips_machine/memory.cpp b/qtmips_machine/memory.cpp index 848669d..f7fdff9 100644 --- a/qtmips_machine/memory.cpp +++ b/qtmips_machine/memory.cpp @@ -39,10 +39,10 @@ using namespace machine; #if __BYTE_ORDER == __LITTLE_ENDIAN #define SH_NTH_8(OFFSET) ((3 - ((OFFSET) & 0b11)) * 8) -#define SH_NTH_16(OFFSET) ((1 - ((OFFSET) & 0b10)) * 16) +#define SH_NTH_16(OFFSET) ((2 - ((OFFSET) & 0b10)) * 8) #else #define SH_NTH_8(OFFSET) (((OFFSET) & 0b11) * 8) -#define SH_NTH_16(OFFSET) (((OFFSET) & 0b10) * 16) +#define SH_NTH_16(OFFSET) (((OFFSET) & 0b10) * 8) #endif bool MemoryAccess::write_byte(std::uint32_t offset, std::uint8_t value) { @@ -102,12 +102,12 @@ std::uint32_t MemoryAccess::read_ctl(enum AccessControl ctl, std::uint32_t offse case AC_BYTE: { std::uint8_t b = this->read_byte(offset); - return (((std::uint32_t)b & 0x80) << 24) | ((std::uint32_t)b & 0x7F); // Sign extend + return ((std::uint32_t)b & 0xFF) - (((std::uint32_t)b & 0x80) << 1); // Sign extend } case AC_HALFWORD: { std::uint16_t h = this->read_hword(offset); - return (((std::uint32_t)h & 0x8000) << 16) | ((std::uint32_t)h & 0x7FFF); // Sign extend + return ((std::uint32_t)h & 0xFFFF) - (((std::uint32_t)h & 0x8000) << 1); // Sign extend } case AC_WORD: return this->read_word(offset); diff --git a/qtmips_machine/tests/testcore.cpp b/qtmips_machine/tests/testcore.cpp index 86a9726..53b6304 100644 --- a/qtmips_machine/tests/testcore.cpp +++ b/qtmips_machine/tests/testcore.cpp @@ -365,13 +365,13 @@ static void core_mem_data() { Registers regs; regs.write_gp(1, 0x22); Registers regs_res(regs); - regs_res.write_gp(21, 0x80000023); + regs_res.write_gp(21, 0xFFFFFFA3); QTest::newRow("LB") << Instruction(32, 1, 21, 0x2) \ << regs \ << regs_res \ << mem \ << mem; - regs_res.write_gp(21, 0x80002324); + regs_res.write_gp(21, 0xFFFFA324); QTest::newRow("LH") << Instruction(33, 1, 21, 0x2) \ << regs \ << regs_res \ diff --git a/qtmips_machine/tests/testmemory.cpp b/qtmips_machine/tests/testmemory.cpp index d24ec54..6e7d23a 100644 --- a/qtmips_machine/tests/testmemory.cpp +++ b/qtmips_machine/tests/testmemory.cpp @@ -179,9 +179,9 @@ void MachineTests::memory_read_ctl_data() { QTest::newRow("none") << AC_NONE \ << (std::uint32_t)0; QTest::newRow("byte") << AC_BYTE \ - << (std::uint32_t)0x80000023; + << (std::uint32_t)0xFFFFFFA3; QTest::newRow("halfword") << AC_HALFWORD \ - << (std::uint32_t)0x80002324; + << (std::uint32_t)0xFFFFA324; QTest::newRow("word") << AC_WORD \ << (std::uint32_t)0xA3242526; QTest::newRow("byte-unsigned") << AC_BYTE_UNSIGNED \ |