3rd September 2018

int80h
10

What does int 80h do?

On the Intel family of microprocessors, such as the Pentium, int 80h is the assembly language op code for interrupt 80h . This is the syscall interrupt on a typical Intel-based Unix system, such as FreeBSD. It allows application programmers to obtain system services from the Unix kernel.

Similarly, what is the system calls?

A system call, sometimes referred to as a kernel call, is a request in a Unix-like operating system made via a software interrupt by an active process for a service performed by the kernel. A process (also frequently referred to as a task) is an executing (i.e., running) instance of a program.

What does Syscall do in MIPS?

The syscall is used to request a service from the kernel. For MIPS, the service number/code must be passed in $v0 and arguments are passed in a few of the other designated registers. For example, to print we might do: li $v0, 1 add $a0, $t0, $zero syscall. In this case, 1 is the service code for print integer.

What is RESB?

RESB and Friends: Declaring Uninitialized Data. RESB , RESW , RESD , RESQ , REST , RESDQ , and RESO are designed to be used in the BSS section of a module: they declare uninitialised storage space. Each takes a single operand, which is the number of bytes, words, doublewords or whatever to reserve.
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