Port musl to x86-64. One giant commit!

[musl] / src / setjmp / x86_64 / setjmp.s

diff --git a/src/setjmp/x86_64/setjmp.s b/src/setjmp/x86_64/setjmp.s
new file mode 100644 (file)
index 0000000..8f29fa8
--- /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