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Assember (x86/x64): addressing modes

The addressing mode specifies how an address of a memory location is calculated.

x86/x64 has the following addressing mode forms and its sub-variants:

section:[ base-register  +  index-register * N  +  displacement ]   ; N ∈ {1,2,4,8} / displacement a 32-bit constant. section is optional
        [ RIP                                   +  displacement ]   ; 64-bit only? Aka RIP-relative mode?

Any register can be a base-register, any register except rsp/esp can be an index-register.

The referenced registers have to be the same size (unless an alternate address size is used???).

RIP-Relative

RIP-relative mode supports modern operating systems by providing a flat address space with a single code, data and stack space.

This mode is the default addressing mode in 64-bit programs.

AT&T syntax vs Intel syntax

The Intel indirect syntax reference of the form section:[base + index*scale + disp] is translated into the AT&T syntax section:disp(base, index, scale). (AT&T requires section to be prefixed with a %).

Intel	AT&T
`[esi]`	`(%esi)`
`[ebp-8]`	`-8(%ebp)`
`[ebp*4 + 0100]`	`0x100(, %ebx,4)`
`[edx+ebx*4 + 8]`	`0x8(%edx,%ebx,4)`

See also this link.

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