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note.txt
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ModRM
==================
mov rbx, [rcx + 0x40]
-----------------------
pushfq
pushaq
lea rdx, [rcx + 0x40]
# we use rbp to save rsp value
# this is safe because both Windows x64 ABI and SystemV x64 ABI
# guarantees rbp must be saved and restored by a function that uses them
mov rbp, rsp
sub rsp, 0x20
and rsp, 0xFFFFFFFFFFFFFFF0
mov rcx, this
mov r8, 8
mov r9, rbx
mov rax, OnMemoryRead
call rax
mov rsp, rbp
popaq
popfq
mov rbx, [rcx + 0x40]
and [rcx + 0x40], rbx
-----------------------
pushfq
pushaq
lea rdx, [rcx + 0x40]
# we use rbp to save rsp value
# this is safe because both Windows x64 ABI and SystemV x64 ABI
# guarantees rbp must be saved and restored by a function that uses them
mov rbp, rsp
sub rsp, 0x20
and rsp, 0xFFFFFFFFFFFFFFF0
mov rcx, this
mov r8, 8
mov rax, OnMemoryRead
call rax
mov rsp, rbp
popaq
popfq
push r15 # r15 is free reg which the instruction doesn't use, including hidden operands.
lea r15, [rcx + 0x40]
mov [rcx + 0x40], rbx # execute original insturction before callback
pushfq
pushaq
mov rdx, r15
# we use rbp to save rsp value
# this is safe because both Windows x64 ABI and SystemV x64 ABI
# guarantees rbp must be saved and restored by a function that uses them
mov rbp, rsp
sub rsp, 0x20
and rsp, 0xFFFFFFFFFFFFFFF0
mov rcx, this
mov r8, 8
mov rax, OnMemoryWrite
call rax
mov rsp, rbp
popaq
popfq
pop r15
rep movsd
==================
pushfq
pushaq
mov rbp, rsp
sub rsp, 0x20
and rsp, 0xFFFFFFFFFFFFFFF0
mov r15, rcx
shl r15, 2 # 1 for w, 2 for d, 3 for q
pushfq
pop rax
bt rax, 0x0A # DF
jnc label # if CF=0
sub rsi, r15
label:
mov rcx, this
mov rdx, rsi
mov r8, r15
mov rax, OnMemoryRead
call rax
mov rsp, rbp
popaq
popfq
push r15
mov r15, rcx
rep movsd
pushfq
pushaq
mov rbp, rsp
sub rsp, 0x20
and rsp, 0xFFFFFFFFFFFFFFF0
sub r15, rcx
shl r15, 2 # 1 for w, 2 for d, 3 for q
pushfq
pop rax
bt rax, 0x0A # DF
jc label # if CF=1
sub rdi, r15
label:
mov rcx, this
mov rdx, rdi
mov r8, r15
mov rax, OnMemoryWrite
call rax
mov rsp, rbp
popaq
popfq
pop r15
vpgatherdd ymm19{k1},dword ptr [rax+ymm2]
62 E2 7D 29 90 1C 10