Add support for TLS in the libc

1 files changed, 19 insertions, 0 deletions

diff --git a/lib/libc/internal/arch/x86_64/setjmp.c b/lib/libc/internal/arch/x86_64/setjmp.c
new file mode 100644
index 00000000..ea205e16
--- /dev/null
+++ b/lib/libc/internal/arch/x86_64/setjmp.c
@@ -0,0 +1,19 @@
+#include "bits/setjmp.h" // for jmp_buf
+
+#include <setjmp.h> // for setjmp
+
+__attribute__((naked, returns_twice)) int setjmp(jmp_buf env)
+{
+	__asm__ __volatile__("mov %rbx,(%rdi)\n"
+			     "mov %rbp,8(%rdi)\n"
+			     "mov %r12,16(%rdi)\n"
+			     "mov %r13,24(%rdi)\n"
+			     "mov %r14,32(%rdi)\n"
+			     "mov %r15,40(%rdi)\n"
+			     "lea 8(%rsp),%rdx\n"
+			     "mov %rdx,48(%rdi)\n"
+			     "mov (%rsp),%rdx\n"
+			     "mov %rdx,56(%rdi)\n"
+			     "xor %eax,%eax\n"
+			     "ret\n");
+}