# LLVM libc AArch64 setjmp/longjmp

[commit](https://github.com/llvm/llvm-project/commit/2a6268d8f999)

## AArch64 extensions

## PAC

> Pointer Authentication

## BTI

> Branch Target Identification

## MTE

> Memory Tagging Extension

## Procedura call

**AAPCS64** -> ARM Architecture Procedure Call Standard for 64-bit

## libc functions

These routines can be used for error handling recovery, and are included in `<setjmp.h>`

### setjmp

Saves the current execution context into a variable of type `jmp_buf`. It returns `0` on the first call, and a value different from zero if program control is restored with `longjmp`.

### longjmp