This project emulates the instruction decoding of an x86 processor.
Supported instructions / opcodes are as follows:
ADD: 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x83
PUSH: 0x50, 0x6A, 0x68
POP: 0x8F, 0x1F, 0x07
AND: 0x25, 0x24, 0x21, 0x22, 0x20
CMP: 0x3C, 0x3D, 0x38, 0x39
MOV: 0x88, 0x89, 0x8A, 0x8B
OR: 0x0C, 0x0D, 0x08, 0x09
XOR: 0x30, 0x31, 0x34, 0x35
BSF: 0xBC
BSR: 0xBD
- C++ 17
- Makefile utility
make
This generates an executable file with the name "main"
Provide the path to the input file as an argument to main.
E.g.-
main inputs/multi-ops/test-01.txt
The emulator should produce an output that looks like this:
----Emulation started----
89 - MOV r/m32,r32
Read value bf8db144 from register EAX
Read value 88c5cffb from register ECX
Set value of memory location bf8db144 to 88c5cffb
--------------------------
83 - Add imm8 to r/m32
Read value 88c5cffb from register ECX
Read value 88c5cffb from memory location bf8db144
Read Imm8 data decimal value 1
Set value of memory location bf8db144 to 88c5cffc
--------------------------
39 - Compare r/m32, r32
Read value bf8db144 from register EAX
Effective addr of SIB byte 5 is bf8db144
Read value 88c5cffc from memory location bf8db144
Read value ae5ff4 from register EBX
--------------------------
8B - MOV r32,r/m32
Read value bf8db144 from register EAX
Read value 88c5cffc from memory location bf8db144
Set value of register EDX to 88c5cffc
--------------------------
50 - Push r32
Read value ae5ff4 from register EBX
Pushing data ae5ff4 to stack
Read value bf8db0bc from register ESP
Set value of memory location bf8db0b8 to ae5ff4
Set value of register ESP to bf8db0b8
--------------------------
35 - XOR EAX, imm32
Read value bf8db144 from register EAX
Read Imm32 data decimal value -16
Set value of register EAX to 40724eb4
--------------------------
----Emulation complete----
-------REGISTER DUMP-------
---General purpose registers:---
EAX : 40724eb4 EBX : ae5ff4 ECX : 88c5cffb EDX : 88c5cffc
AX : 4eb4 BX : 5ff4 CX : cffb DX : cffc
AH : 4e BH : 5f CH : cf DH : cf
AL : b4 BL : f4 CL : fb DL : fc
---Other registers:---
EBP : bf8db118
EDI : 0
EFLAGS : 207
EIP : 8048354
ESI : 9a0ca0
ESP : bf8db0b8
---Flags:---
AC : 0 AF : 0 CF : 1 DF : 0 ID : 0 IF : 1 NT : 0 OF : 0 PF : 1 RF : 0 SF : 0 TF : 0 VIF : 0 VIP : 0 VM : 0 ZF : 0
-------MEMORY DUMP-------
bf8db0b8 : ae5ff4 bf8db144 : 88c5cffc
Test cases are available in the inputs/ folder.
The inputs/guide.md file provides an overview of the test cases and their expected results.