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authorRichard Kuo <rkuo@codeaurora.org>2011-10-31 18:35:16 -0500
committerLinus Torvalds <torvalds@linux-foundation.org>2011-11-01 07:34:18 -0700
commitb9398a84590be3a828c168ed25bf1fd3d637988a (patch)
tree8467675f8d6787c7036beb3ddf599249a7903658
parent750850189b2b7e43c03f33bf5741887e8ca07d16 (diff)
downloadlinux-linaro-stable-b9398a84590be3a828c168ed25bf1fd3d637988a.tar.gz
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>
-rw-r--r--arch/hexagon/include/asm/syscall.h54
-rw-r--r--arch/hexagon/include/asm/unistd.h36
-rw-r--r--arch/hexagon/kernel/syscall.c90
-rw-r--r--arch/hexagon/kernel/syscalltab.c32
4 files changed, 212 insertions, 0 deletions
diff --git a/arch/hexagon/include/asm/syscall.h b/arch/hexagon/include/asm/syscall.h
new file mode 100644
index 000000000000..3e7d61d38d97
--- /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
index 000000000000..4d0ecde3665f
--- /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
index 000000000000..620dd18197a0
--- /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
index 000000000000..c550f4177ab8
--- /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>
+};