[youtube https://www.youtube.com/watch?v=VYFE3tYUdJU?rel=0&w=560&h=315]
Tag Archives: language
First steps…
[BITS 32] [global start] [extern _k_main] ; this is in the c file start: call _k_main cli ; stop interrupts hlt ; halt the CPU
LEA instruction
The lea instruction places the address specified by its second operand into the register specified by its first operand. Note, the contents ofthe memory location are not loaded, only the effective address is computed and placed into the register. This is useful for obtaining a pointer into a memory region. source: http://www.cs.virginia.edu/~evans/cs216/guides/x86.html
software interrupt –
WinDbg shows “int” Instruction ntdll!DbgBreakPoint: 7c901230 cc int 3 7c901231 c3 ret 7c901232 8bff mov edi,edi ntdll!DbgUserBreakPoint: 7c901234 90 nop 7c901235 90 nop 7c901236 90 nop 7c901237 90 nop ntdll!DbgBreakPointWithStatus: 7c901238 90 nop ntdll!DbgUserBreakPoint: 7c901239 cc int 3 7c90123a c3 ret 7c90123b 90 nop 7c90123c 8bff mov edi,edi 7c901230 cc int 3 Process Involved WinRAR …