Fixup mips so it now works and provides basic functionality

1 files changed, 107 insertions, 0 deletions

diff --git a/libc/sysdeps/linux/mips/clone.S b/libc/sysdeps/linux/mips/clone.S
new file mode 100644
index 000000000..6f6a6c5b7
--- /dev/null
+++ b/libc/sysdeps/linux/mips/clone.S
@@ -0,0 +1,107 @@
+/* Copyright (C) 1996, 1997, 2000 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Ralf Baechle <ralf@gnu.ai.mit.edu>, 1996.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+/* clone() is even more special than fork() as it mucks with stacks
+   and invokes a function in the right context after its all over.  */
+
+#include <asm/unistd.h>
+#include <sysdep.h>
+#define _ERRNO_H	1
+#include <bits/errno.h>
+
+/* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg) */
+
+	.text
+NESTED(__clone,4*SZREG,sp)
+#ifdef __PIC__
+	.set		noreorder
+	.cpload		$25
+	.set		reorder
+	subu		sp,32
+	.cprestore	16
+#else
+	subu		sp,32
+#endif
+#ifdef PROF
+	.set		noat
+	move		$1,ra
+	jal		_mcount
+	.set		at
+#endif
+
+
+	/* Sanity check arguments.  */
+	li		v0,EINVAL
+	beqz		a0,error	/* No NULL function pointers.  */
+	beqz		a1,error	/* No NULL stack pointers.  */
+
+	subu		a1,32		/* Reserve argument save space.  */
+	sw		a0,0(a1)	/* Save function pointer.  */
+	sw		a3,4(a1)	/* Save argument pointer.  */
+
+
+	/* Do the system call */
+	move		a0,a2
+	li		v0,__NR_clone
+	syscall
+
+	bnez		a3,error
+	beqz		v0,__thread_start
+
+	/* Successful return from the parent */
+	addiu		sp,32
+	ret
+
+	/* Something bad happened -- no child created */
+error:
+	addiu		sp,32
+#ifdef __PIC__
+	la		t9,__syscall_error
+	jr		t9
+#else
+	j		__syscall_error
+#endif
+	END(__clone)
+
+/* Load up the arguments to the function.  Put this block of code in
+   its own function so that we can terminate the stack trace with our
+   debug info.  */
+
+ENTRY(__thread_start)
+	/* cp is already loaded.  */
+	.cprestore	16
+	/* The stackframe has been created on entry of clone().  */
+	/* Restore the arg for user's function.  */
+	lw		t9,0(sp)	/* Function pointer.  */
+	lw		a0,4(sp)	/* Argument pointer.  */
+
+	/* Call the user's function.  */
+	jalr		t9
+
+	/* Call _exit rather than doing it inline for breakpoint purposes.  */
+	move		a0,v0
+#ifdef __PIC__
+	la		t9,_exit
+	jalr		t9
+#else
+	jal		_exit
+#endif
+	END(__thread_start)
+
+weak_alias(__clone, clone)