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- /* 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 */
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