1/* Copyright 2011-2012 Nicholas J. Kain, licensed under standard MIT license */ 2.global _longjmp 3.global longjmp 4.type _longjmp,@function 5.type longjmp,@function 6_longjmp: 7longjmp: 8 mov %rsi,%rax /* val will be longjmp return */ 9 test %rax,%rax 10 jnz 1f 11 inc %rax /* if val==0, val=1 per longjmp semantics */ 121: 13 mov (%rdi),%rbx /* rdi is the jmp_buf, restore regs from it */ 14 mov 8(%rdi),%rbp 15 mov 16(%rdi),%r12 16 mov 24(%rdi),%r13 17 mov 32(%rdi),%r14 18 mov 40(%rdi),%r15 19 mov 48(%rdi),%rdx /* this ends up being the stack pointer */ 20 mov %rdx,%rsp 21 mov 56(%rdi),%rdx /* this is the instruction pointer */ 22 jmp *%rdx /* goto saved address without altering rsp */ 23