[Fw] assembly code in gas syntax
Address operand syntax
There are up to 4 parameters of an address operand that are presented in the syntax displacement(base register, offset register, scalar multiplier)
. This is equivalent to [base register + displacement + offset register * scalar multiplier]
in Intel syntax. Either or both of the numeric, and either of the register parameters may be omitted:
movl -4(%ebp, %edx, 4), %eax # Full example: load *(ebp - 4 + (edx * 4)) into eax
movl -4(%ebp), %eax # Typical example: load a stack variable into eax
movl (%ecx), %edx # No offset: copy the target of a pointer into a register
leal 8(,%eax,4), %eax # Arithmetic: multiply eax by 4 and add 8
leal (%eax,%eax,2), %eax # Arithmetic: multiply eax by 2 and add eax (i.e. multiply by 3) 實際 Kernel 上應用
call _sys_call_table(,%eax,4) |
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