diff options
Diffstat (limited to 'src/setjmp/x86_64/longjmp.s')
| -rw-r--r-- | src/setjmp/x86_64/longjmp.s | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/src/setjmp/x86_64/longjmp.s b/src/setjmp/x86_64/longjmp.s new file mode 100644 index 00000000..c63b0c95 --- /dev/null +++ b/src/setjmp/x86_64/longjmp.s @@ -0,0 +1,24 @@ +/* Copyright 2011 Nicholas J. Kain, licensed GNU LGPL 2.1 or later */ +.global _longjmp +.global longjmp +.type _longjmp,%function +.type longjmp,%function +_longjmp: +longjmp: + mov %rsi,%rax /* val will be longjmp return */ + test %rax,%rax + jnz .L0 + inc %rax /* if val==0, val=1 per longjmp semantics */ +.L0: + movq (%rdi),%rbx /* rdi is the jmp_buf, restore regs from it */ + movq 8(%rdi),%rbp + movq 16(%rdi),%r12 + movq 24(%rdi),%r13 + movq 32(%rdi),%r14 + movq 40(%rdi),%r15 + movq 48(%rdi),%rdx /* this ends up being the stack pointer */ + mov %rdx,%rsp + movq 56(%rdi),%rdx /* this is the instruction pointer */ + jmp *%rdx /* goto saved address without altering rsp */ +.size _longjmp,.-_longjmp +.size longjmp,.-longjmp |