summaryrefslogtreecommitdiff
path: root/src/setjmp/x86_64/setjmp.s
diff options
context:
space:
mode:
Diffstat (limited to 'src/setjmp/x86_64/setjmp.s')
-rw-r--r--src/setjmp/x86_64/setjmp.s25
1 files changed, 25 insertions, 0 deletions
diff --git a/src/setjmp/x86_64/setjmp.s b/src/setjmp/x86_64/setjmp.s
new file mode 100644
index 00000000..8f29fa81
--- /dev/null
+++ b/src/setjmp/x86_64/setjmp.s
@@ -0,0 +1,25 @@
+/* Copyright 2011 Nicholas J. Kain, licensed GNU LGPL 2.1 or later */
+.global __setjmp
+.global _setjmp
+.global setjmp
+.type __setjmp,%function
+.type _setjmp,%function
+.type setjmp,%function
+__setjmp:
+_setjmp:
+setjmp:
+ mov %rbx,(%rdi) /* rdi is jmp_buf, move registers onto it */
+ mov %rbp,8(%rdi)
+ mov %r12,16(%rdi)
+ mov %r13,24(%rdi)
+ mov %r14,32(%rdi)
+ mov %r15,40(%rdi)
+ leaq 8(%rsp),%rdx /* this is our rsp WITHOUT current ret addr */
+ mov %rdx,48(%rdi)
+ movq (%rsp),%rdx /* save return addr ptr for new rip */
+ mov %rdx,56(%rdi)
+ xor %rax,%rax /* always return 0 */
+ ret
+.size __setjmp,.-__setjmp
+.size _setjmp,.-_setjmp
+.size setjmp,.-setjmp