/* Copyright 2011 Nicholas J. Kain, licensed GNU LGPL 2.1 or later */ .global _longjmp .global longjmp _longjmp: longjmp: mov %rsi,%rax /* val will be longjmp return */ test %rax,%rax jnz 1f inc %rax /* if val==0, val=1 per longjmp semantics */ 1: mov (%rdi),%rbx /* rdi is the jmp_buf, restore regs from it */ mov 8(%rdi),%rbp mov 16(%rdi),%r12 mov 24(%rdi),%r13 mov 32(%rdi),%r14 mov 40(%rdi),%r15 mov 48(%rdi),%rdx /* this ends up being the stack pointer */ mov %rdx,%rsp mov 56(%rdi),%rdx /* this is the instruction pointer */ jmp *%rdx /* goto saved address without altering rsp */