Port musl to x86-64. One giant commit!

[musl] / src / thread / x86_64 / clone.s

diff --git a/src/thread/x86_64/clone.s b/src/thread/x86_64/clone.s
new file mode 100644 (file)
index 0000000..5141005
--- /dev/null
+++ b/src/thread/x86_64/clone.s
@@ -0,0 +1,22 @@
+/* Copyright 2011 Nicholas J. Kain, licensed GNU LGPL 2.1 or later */
+.text
+.global __uniclone
+.type   __uniclone,%function
+/* rdi = child_stack, rsi = start, rdx = pthread_struct */
+__uniclone:
+        subq    $16,%rdi        /* grow child_stack */
+        mov     %rsi,8(%rdi)    /* push start onto child_stack as return ptr */
+        mov     %rdx,0(%rdi)    /* push pthread_struct onto child_stack */
+        mov     %rdx,%r8        /* r8 = tls */
+        mov     %rdi,%rsi       /* rsi = child_stack */
+        leaq    40(%rdx),%r10   /* r10 = child_id */
+        movl    $56,%eax        /* clone syscall number */
+        movl    $0x7d0f00,%edi  /* rdi = flags */
+        mov     %r10,%rdx       /* rdx = parent_id */
+       syscall                 /* clone(flags, child_stack, parent_id,
+                                *       child_id, tls) */
+       test    %rax,%rax
+       jnz     1f              /* if we're in the parent -> goto 1f */
+        pop     %rdi            /* restore pthread_struct from child stack */
+1:      ret
+.size __uniclone,.-__uniclone