shld broken
Closed this issue · 3 comments
brandonros commented
{
"i": 169,
"x64dbgLine": {
"rawLine": {
"Index": "000A9",
"Address": "0000000144FBED19",
"Bytes": "6641:0FA4EB 3C",
"Disassembly": "shld r11w,bp,3C",
"Registers": "r11: 1BB09DE2F-> 1BB099DE2",
"Memory": "",
"Comments": ""
},
"rip": "144fbed19",
"registerChanges": [
{
"registerName": "r11",
"previousValue": "1bb09de2f",
"newValue": "1bb099de2"
}
],
"memoryChanges": []
},
"scemuLine": {
"rawLine": "diff_reg: rip = 144fbed19",
"rip": "144fbed19",
"registerChanges": [],
"memoryChanges": []
},
"instructionErrors": [
{
"index": 0,
"message": "unmatchedRegisterChange mismatch (x64dbg but not scemu)",
"x64dbg": "r11"
}
]
},
brandonros commented
170 0x144fbed19: shld r11w,bp,3Ch
/!\ undefined behaviour on shld
shld: value0 = de2f value1 = 4239 counter = 3c sz = 16 result = de2f undef = true
diff_flags: rip = 144fbed19 f_sf 0 -> 1;
diff_reg: rip = 144fbed19
rax: 0x58 rbx: 0x0 rcx: 0x140000000 rdx: 0x100000000 rsi: 0x14f418 rdi: 0x144e47251 rbp: 0x144ed4239 rsp: 0x14f288
r8: 0x0 r9: 0x0 r10: 0x10fee6 r11: 0x1bb09de2f r12: 0x1448a76a4 r13: 0x0 r14: 0x140000000 r15: 0x0
sha0coder commented
"Registers": "r11: 1BB09DE2F-> 1BB099DE2",
is curious the SHLD undefined behaviors are like shifting left, sometimes value1 and other times value0
brandonros commented
inline fixed it, was undefined behavior