Search results
Results From The WOW.Com Content Network
This article describes the calling conventions used when programming x86 architecture microprocessors. Calling conventions describe the interface of called code: The order in which atomic (scalar) parameters, or individual parts of a complex parameter, are allocated; How parameters are passed (pushed on the stack, placed in registers, or a mix ...
A common aspect of an ABI is the calling convention, which determines how data is provided as input to, or read as output from, computational routines. Examples of this are the x86 calling conventions. Adhering to an ABI (which may or may not be officially standardized) is usually the job of a compiler, operating system, or library author ...
The calling convention of a given program's language may differ from the calling convention of the underlying platform, OS, or of some library being linked to. For example, on 32-bit Windows , operating system calls have the stdcall calling convention, whereas many C programs that run there use the cdecl calling convention.
Download QR code; Print/export Download as PDF; Printable version; In other projects Wikimedia Commons; ... X86 calling conventions; X86 virtualization; X86-64; X87
Under certain calling conventions it is the callee's responsibility to clean the arguments off the stack, so the epilogue can also include the step of moving the stack pointer down or up. For example, these three steps may be accomplished in 32-bit x86 assembly language by the following instructions:
Whether it is faster or slower depends on the particular x86-processor implementation as well as the calling convention used by the compiler, programmer or particular program code; most x86 code is intended to run on x86-processors from several manufacturers and on different technological generations of processors, which implies highly varying ...
In some architectures, assigning a value to one register can affect the value of another: this is called aliasing. For example, the x86 architecture has four general purpose 32-bit registers that can also be used as 16-bit or 8-bit registers. [11] In this case, assigning a 32-bit value to the eax register will affect the value of the al register.
Models with >8 KiB of ROM add the 2-word (22-bit) JUMP and CALL instructions. (Some early models suffer an erratum if a skip instruction is followed by a 2-word instruction.) Models with >64 KiB of ROM add the ELPM instruction and corresponding RAMPZ register.