MIPS support for libc.
Change-Id: I2864dea04b3faf2d919165dcaa600af5b16c41c8
Signed-off-by: Chris Dearman <chris@mips.com>
Signed-off-by: Raghu Gandham <raghu@mips.com>
diff --git a/libc/arch-mips/bionic/clone.S b/libc/arch-mips/bionic/clone.S
new file mode 100644
index 0000000..30fef8d
--- /dev/null
+++ b/libc/arch-mips/bionic/clone.S
@@ -0,0 +1,145 @@
+/*
+ * Copyright (C) 2008 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 <linux/sched.h>
+#include <sys/linux-syscalls.h>
+#include <linux/errno.h>
+
+ .text
+ .type __pthread_clone, @function
+ .global __pthread_clone
+ .align 4
+ .ent __pthread_clone
+
+/*
+ * int __pthread_clone(int (*fn)(void*), void *child_stack,
+ * int flags, void *arg);
+ */
+
+__pthread_clone:
+ .set noreorder
+ .cpload $t9
+ .set reorder
+
+ # set up child stack
+ subu $a1,16
+ sw $a0,0($a1) # fn
+ sw $a3,4($a1) # arg
+# sw $a1+16,8($a1) # tls
+
+ /*
+ * int sys_clone(int flags, void *child_stack, int *parent_tidptr,
+ * struct user_desc *newtls, int *child_tidptr);
+ */
+
+ move $a0,$a2 # flags
+# move $a1,$a1 # child_stack
+ move $a2,$0 # parent_tidptr
+ move $a3,$0 # user_desc
+ and $a0,~(CLONE_CHILD_SETTID | CLONE_CHILD_CLEARTID)
+ # make sure the kernel doesn't access child_tidptr
+
+ li $v0,__NR_clone
+ syscall
+
+ bnez $a3,.L__error
+
+ beqz $v0,.L__thread_start
+
+ j $ra
+
+.L__thread_start:
+ lw $a0,0($sp) # fn
+ lw $a1,4($sp) # arg
+ addu $a2,$sp,16 # tls
+
+ # void __thread_entry(int (*func)(void*), void *arg, void *tls)
+ la $t9, __thread_entry
+ j $t9
+
+.L__error:
+ move $a0,$v0
+ la $t9,__set_errno
+ j $t9
+
+ .end __pthread_clone
+
+
+ #
+ # This function is defined as:
+ #
+ # pid_t __bionic_clone( int flags, void *child_stack,
+ # pid_t *pid, void *tls, pid_t *ctid,
+ # int (*fn)(void *), void* arg );
+ #
+ # NOTE: This is not the same signature than the GLibc
+ # __clone function here !! Placing 'fn' and 'arg'
+ # at the end of the parameter list makes the
+ # implementation much simpler.
+ #
+ .text
+ .type __bionic_clone, @function
+ .global __bionic_clone
+ .align 4
+ .ent __bionic_clone
+__bionic_clone:
+ .set noreorder
+ .cpload $t9
+ .set reorder
+
+ # set up child stack
+ subu $a1,16
+ lw $t0,20($sp) # fn
+ lw $t1,24($sp) # arg
+ sw $t0,0($a1) # fn
+ sw $t1,4($a1) # arg
+
+ # remainder of arguments are correct for clone system call
+ li $v0,__NR_clone
+ syscall
+
+ bnez $a3,.L__error_bc
+
+ beqz $v0,.L__thread_start_bc
+
+ j $ra
+
+.L__thread_start_bc:
+ lw $a0,0($sp) # fn
+ lw $a1,4($sp) # arg
+
+ # void __bionic_clone_entry(int (*func)(void*), void *arg)
+ la $t9,__bionic_clone_entry
+ j $t9
+
+.L__error_bc:
+ move $a0,$v0
+ la $t9,__set_errno
+ j $t9
+
+ .end __bionic_clone
+