| /* Copyright 2011-2012 Nicholas J. Kain, licensed under standard MIT license */ |
| .global _longjmp |
| .global longjmp |
| .type _longjmp,@function |
| .type longjmp,@function |
| _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 */ |
