diff options
Diffstat (limited to 'qtmips_machine/memory.cpp')
| -rw-r--r-- | qtmips_machine/memory.cpp | 8 |
1 files changed, 4 insertions, 4 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); |