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path: root/src/setjmp/x86_64/longjmp.s
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Diffstat (limited to 'src/setjmp/x86_64/longjmp.s')
-rw-r--r--src/setjmp/x86_64/longjmp.s24
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