Add arch-x86_64/bionic.
This is basically half of I5de76f6c46ac87779f207d568a86bb453e2414de from
Pavel Chupin <pavel.v.chupin@intel.com>, but with the stock upstream
setjump/sigsetjmp and H.J. Lu's suggested changes to __rt_sigreturn.
Change-Id: I8167ec228faeb2065391e5bec0413cca662f3d33
diff --git a/libc/arch-x86_64/bionic/clone.S b/libc/arch-x86_64/bionic/clone.S
new file mode 100644
index 0000000..df2929e
--- /dev/null
+++ b/libc/arch-x86_64/bionic/clone.S
@@ -0,0 +1,111 @@
+/*
+ * Copyright (C) 2013 The Android Open Source Project
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <asm/unistd.h>
+#include <machine/asm.h>
+
+// int __pthread_clone(void* (*fn)(void*), void* tls, int flags, void* arg);
+ENTRY(__pthread_clone)
+ # save tls
+ movq %rsi, %r11
+ # 16-byte alignment on child stack
+ andq $~15, %rsi
+
+ # insert arguments onto the child stack
+ movq %rdi, -32(%rsi)
+ movq %rcx, -24(%rsi)
+ movq %r11, -16(%rsi)
+
+ subq $32, %rsi
+ movq %rdx, %rdi
+ movl $__NR_clone, %eax
+ syscall
+ testl %eax, %eax
+ jns 1f
+
+ # an error occurred, set errno and return -1
+ negl %eax
+ movl %eax, %edi
+ call __set_errno
+ orl $-1, %eax
+ jmp 2f
+1:
+ jnz 2f
+
+ # we're in the child thread now, call __thread_entry
+ # with the appropriate arguments on the child stack
+ # we already placed most of them
+ call __thread_entry
+ hlt
+2:
+ ret
+
+/*
+ * int __bionic_clone(unsigned long clone_flags,
+ * void* newsp,
+ * int *parent_tidptr,
+ * void *new_tls,
+ * int *child_tidptr,
+ * int (*fn)(void *),
+ * void *arg);
+ */
+ENTRY(__bionic_clone)
+ # insert arguments onto the child stack
+ andq $~15, %rsi
+ movq %r9, -16(%rsi)
+ # 7th argument (arg) goes through stack
+ movq 8(%rsp), %rax
+ movq %rax, -8(%rsi)
+
+ subq $16, %rsi
+ movq %r8, %r10
+ movq %rcx, %r8
+ movl $__NR_clone, %eax
+ syscall
+ testl %eax, %eax
+ jns 1f
+
+ # an error occurred, set errno and return -1
+ negl %eax
+ movl %eax, %edi
+ call __set_errno
+ orl $-1, %eax
+ jmp 2f
+
+1:
+ jnz 2f
+
+ # we're in the child now, call __bionic_clone_entry
+ # with the appropriate arguments on the child stack
+ # we already placed most of them
+ call __bionic_clone_entry
+ hlt
+
+2:
+ ret
+