diff options
Diffstat (limited to 'src/setjmp/x32/longjmp.s')
| -rw-r--r-- | src/setjmp/x32/longjmp.s | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/src/setjmp/x32/longjmp.s b/src/setjmp/x32/longjmp.s new file mode 100644 index 00000000..e175a4b9 --- /dev/null +++ b/src/setjmp/x32/longjmp.s @@ -0,0 +1,22 @@ +/* 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 */ |