Hexagon: Add syscalls
Signed-off-by: Richard Kuo <rkuo@codeaurora.org>
Signed-off-by: Linas Vepstas <linas@codeaurora.org>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/arch/hexagon/kernel/syscall.c b/arch/hexagon/kernel/syscall.c
new file mode 100644
index 0000000..620dd18
--- /dev/null
+++ b/arch/hexagon/kernel/syscall.c
@@ -0,0 +1,90 @@
+/*
+ * Hexagon system calls
+ *
+ * Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+#include <linux/file.h>
+#include <linux/fs.h>
+#include <linux/linkage.h>
+#include <linux/mm.h>
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/syscalls.h>
+#include <linux/unistd.h>
+#include <asm/mman.h>
+#include <asm/registers.h>
+
+/*
+ * System calls with architecture-specific wrappers.
+ * See signal.c for signal-related system call wrappers.
+ */
+
+asmlinkage int sys_execve(char __user *ufilename,
+ const char __user *const __user *argv,
+ const char __user *const __user *envp)
+{
+ struct pt_regs *pregs = current_thread_info()->regs;
+ char *filename;
+ int retval;
+
+ filename = getname(ufilename);
+ retval = PTR_ERR(filename);
+ if (IS_ERR(filename))
+ return retval;
+
+ retval = do_execve(filename, argv, envp, pregs);
+ putname(filename);
+
+ return retval;
+}
+
+asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp,
+ unsigned long parent_tidp, unsigned long child_tidp)
+{
+ struct pt_regs *pregs = current_thread_info()->regs;
+
+ if (!newsp)
+ newsp = pregs->SP;
+ return do_fork(clone_flags, newsp, pregs, 0, (int __user *)parent_tidp,
+ (int __user *)child_tidp);
+}
+
+/*
+ * Do a system call from the kernel, so as to have a proper pt_regs
+ * and recycle the sys_execvpe infrustructure.
+ */
+int kernel_execve(const char *filename,
+ const char *const argv[], const char *const envp[])
+{
+ register unsigned long __a0 asm("r0") = (unsigned long) filename;
+ register unsigned long __a1 asm("r1") = (unsigned long) argv;
+ register unsigned long __a2 asm("r2") = (unsigned long) envp;
+ int retval;
+
+ __asm__ volatile(
+ " R6 = #%4;\n"
+ " trap0(#1);\n"
+ " %0 = R0;\n"
+ : "=r" (retval)
+ : "r" (__a0), "r" (__a1), "r" (__a2), "i" (__NR_execve)
+ );
+
+ return retval;
+}
+EXPORT_SYMBOL(kernel_execve);