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>

diff --git a/arch/hexagon/include/asm/syscall.h b/arch/hexagon/include/asm/syscall.h
new file mode 100644 (file)
index 0000000..3e7d61d
--- /dev/null
+++ b/arch/hexagon/include/asm/syscall.h
@@ -0,0 +1,54 @@
+/*
+ * Syscall support for the Hexagon architecture
+ *
+ * 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.
+ */
+
+#ifndef _ASM_HEXAGON_SYSCALL_H
+#define _ASM_HEXAGON_SYSCALL_H
+
+typedef long (*syscall_fn)(unsigned long, unsigned long,
+       unsigned long, unsigned long,
+       unsigned long, unsigned long);
+
+asmlinkage int sys_execve(char __user *ufilename, char __user * __user *argv,
+                         char __user * __user *envp);
+asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp,
+                        unsigned long parent_tidp, unsigned long child_tidp);
+
+#define sys_execve     sys_execve
+#define sys_clone      sys_clone
+
+#include <asm-generic/syscalls.h>
+
+extern void *sys_call_table[];
+
+static inline long syscall_get_nr(struct task_struct *task,
+                                 struct pt_regs *regs)
+{
+       return regs->r06;
+}
+
+static inline void syscall_get_arguments(struct task_struct *task,
+                                        struct pt_regs *regs,
+                                        unsigned int i, unsigned int n,
+                                        unsigned long *args)
+{
+       BUG_ON(i + n > 6);
+       memcpy(args, &(&regs->r00)[i], n * sizeof(args[0]));
+}
+#endif

diff --git a/arch/hexagon/include/asm/unistd.h b/arch/hexagon/include/asm/unistd.h
new file mode 100644 (file)
index 0000000..4d0ecde
--- /dev/null
+++ b/arch/hexagon/include/asm/unistd.h
@@ -0,0 +1,36 @@
+/*
+ * Syscall support for Hexagon
+ *
+ * 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.
+ */
+
+#if !defined(_ASM_HEXAGON_UNISTD_H) || defined(__SYSCALL)
+#define _ASM_HEXAGON_UNISTD_H
+
+/*
+ *  The kernel pulls this unistd.h in three different ways:
+ *  1.  the "normal" way which gets all the __NR defines
+ *  2.  with __SYSCALL defined to produce function declarations
+ *  3.  with __SYSCALL defined to produce syscall table initialization
+ *  See also:  syscalltab.c
+ */
+
+#define sys_mmap2 sys_mmap_pgoff
+
+#include <asm-generic/unistd.h>
+
+#endif

diff --git a/arch/hexagon/kernel/syscall.c b/arch/hexagon/kernel/syscall.c
new file mode 100644 (file)
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);

diff --git a/arch/hexagon/kernel/syscalltab.c b/arch/hexagon/kernel/syscalltab.c
new file mode 100644 (file)
index 0000000..c550f41
--- /dev/null
+++ b/arch/hexagon/kernel/syscalltab.c
@@ -0,0 +1,32 @@
+/*
+ * System call table for Hexagon
+ *
+ * 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/syscalls.h>
+#include <linux/signal.h>
+#include <linux/unistd.h>
+
+#include <asm/syscall.h>
+
+#undef __SYSCALL
+#define __SYSCALL(nr, call) [nr] = (call),
+
+void *sys_call_table[__NR_syscalls] = {
+#include <asm/unistd.h>
+};