wehub-resource-sync
101 lines
2.0 KiB
Markdown
101 lines
2.0 KiB
Markdown
# binary-analysis-patterns — detailed sections
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## Disassembly Fundamentals
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### x86-64 Instruction Patterns
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#### Function Prologue/Epilogue
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```asm
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; Standard prologue
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push rbp ; Save base pointer
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mov rbp, rsp ; Set up stack frame
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sub rsp, 0x20 ; Allocate local variables
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; Leaf function (no calls)
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; May skip frame pointer setup
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sub rsp, 0x18 ; Just allocate locals
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; Standard epilogue
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mov rsp, rbp ; Restore stack pointer
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pop rbp ; Restore base pointer
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ret
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; Leave instruction (equivalent)
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leave ; mov rsp, rbp; pop rbp
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ret
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```
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#### Calling Conventions
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**System V AMD64 (Linux, macOS)**
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```asm
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; Arguments: RDI, RSI, RDX, RCX, R8, R9, then stack
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; Return: RAX (and RDX for 128-bit)
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; Caller-saved: RAX, RCX, RDX, RSI, RDI, R8-R11
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; Callee-saved: RBX, RBP, R12-R15
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; Example: func(a, b, c, d, e, f, g)
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mov rdi, [a] ; 1st arg
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mov rsi, [b] ; 2nd arg
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mov rdx, [c] ; 3rd arg
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mov rcx, [d] ; 4th arg
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mov r8, [e] ; 5th arg
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mov r9, [f] ; 6th arg
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push [g] ; 7th arg on stack
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call func
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```
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**Microsoft x64 (Windows)**
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```asm
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; Arguments: RCX, RDX, R8, R9, then stack
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; Shadow space: 32 bytes reserved on stack
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; Return: RAX
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; Example: func(a, b, c, d, e)
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sub rsp, 0x28 ; Shadow space + alignment
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mov rcx, [a] ; 1st arg
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mov rdx, [b] ; 2nd arg
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mov r8, [c] ; 3rd arg
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mov r9, [d] ; 4th arg
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mov [rsp+0x20], [e] ; 5th arg on stack
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call func
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add rsp, 0x28
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```
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### ARM Assembly Patterns
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#### ARM64 (AArch64) Calling Convention
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```asm
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; Arguments: X0-X7
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; Return: X0 (and X1 for 128-bit)
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; Frame pointer: X29
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; Link register: X30
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; Function prologue
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stp x29, x30, [sp, #-16]! ; Save FP and LR
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mov x29, sp ; Set frame pointer
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; Function epilogue
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ldp x29, x30, [sp], #16 ; Restore FP and LR
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ret
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```
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#### ARM32 Calling Convention
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```asm
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; Arguments: R0-R3, then stack
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; Return: R0 (and R1 for 64-bit)
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; Link register: LR (R14)
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; Function prologue
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push {fp, lr}
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add fp, sp, #4
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; Function epilogue
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pop {fp, pc} ; Return by popping PC
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```
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