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authorRichard Kuo <rkuo@codeaurora.org>2011-10-31 19:35:16 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2011-11-01 10:34:18 -0400
commitb9398a84590be3a828c168ed25bf1fd3d637988a (patch)
tree8467675f8d6787c7036beb3ddf599249a7903658 /arch/hexagon
parent750850189b2b7e43c03f33bf5741887e8ca07d16 (diff)
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>
Diffstat (limited to 'arch/hexagon')
-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 @@
1/*
2 * Syscall support for the Hexagon architecture
3 *
4 * Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 and
8 * only version 2 as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
18 * 02110-1301, USA.
19 */
20
21#ifndef _ASM_HEXAGON_SYSCALL_H
22#define _ASM_HEXAGON_SYSCALL_H
23
24typedef long (*syscall_fn)(unsigned long, unsigned long,
25 unsigned long, unsigned long,
26 unsigned long, unsigned long);
27
28asmlinkage int sys_execve(char __user *ufilename, char __user * __user *argv,
29 char __user * __user *envp);
30asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp,
31 unsigned long parent_tidp, unsigned long child_tidp);
32
33#define sys_execve sys_execve
34#define sys_clone sys_clone
35
36#include <asm-generic/syscalls.h>
37
38extern void *sys_call_table[];
39
40static inline long syscall_get_nr(struct task_struct *task,
41 struct pt_regs *regs)
42{
43 return regs->r06;
44}
45
46static inline void syscall_get_arguments(struct task_struct *task,
47 struct pt_regs *regs,
48 unsigned int i, unsigned int n,
49 unsigned long *args)
50{
51 BUG_ON(i + n > 6);
52 memcpy(args, &(&regs->r00)[i], n * sizeof(args[0]));
53}
54#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 @@
1/*
2 * Syscall support for Hexagon
3 *
4 * Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 and
8 * only version 2 as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
18 * 02110-1301, USA.
19 */
20
21#if !defined(_ASM_HEXAGON_UNISTD_H) || defined(__SYSCALL)
22#define _ASM_HEXAGON_UNISTD_H
23
24/*
25 * The kernel pulls this unistd.h in three different ways:
26 * 1. the "normal" way which gets all the __NR defines
27 * 2. with __SYSCALL defined to produce function declarations
28 * 3. with __SYSCALL defined to produce syscall table initialization
29 * See also: syscalltab.c
30 */
31
32#define sys_mmap2 sys_mmap_pgoff
33
34#include <asm-generic/unistd.h>
35
36#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 @@
1/*
2 * Hexagon system calls
3 *
4 * Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 and
8 * only version 2 as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
18 * 02110-1301, USA.
19 */
20
21#include <linux/file.h>
22#include <linux/fs.h>
23#include <linux/linkage.h>
24#include <linux/mm.h>
25#include <linux/module.h>
26#include <linux/sched.h>
27#include <linux/slab.h>
28#include <linux/syscalls.h>
29#include <linux/unistd.h>
30#include <asm/mman.h>
31#include <asm/registers.h>
32
33/*
34 * System calls with architecture-specific wrappers.
35 * See signal.c for signal-related system call wrappers.
36 */
37
38asmlinkage int sys_execve(char __user *ufilename,
39 const char __user *const __user *argv,
40 const char __user *const __user *envp)
41{
42 struct pt_regs *pregs = current_thread_info()->regs;
43 char *filename;
44 int retval;
45
46 filename = getname(ufilename);
47 retval = PTR_ERR(filename);
48 if (IS_ERR(filename))
49 return retval;
50
51 retval = do_execve(filename, argv, envp, pregs);
52 putname(filename);
53
54 return retval;
55}
56
57asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp,
58 unsigned long parent_tidp, unsigned long child_tidp)
59{
60 struct pt_regs *pregs = current_thread_info()->regs;
61
62 if (!newsp)
63 newsp = pregs->SP;
64 return do_fork(clone_flags, newsp, pregs, 0, (int __user *)parent_tidp,
65 (int __user *)child_tidp);
66}
67
68/*
69 * Do a system call from the kernel, so as to have a proper pt_regs
70 * and recycle the sys_execvpe infrustructure.
71 */
72int kernel_execve(const char *filename,
73 const char *const argv[], const char *const envp[])
74{
75 register unsigned long __a0 asm("r0") = (unsigned long) filename;
76 register unsigned long __a1 asm("r1") = (unsigned long) argv;
77 register unsigned long __a2 asm("r2") = (unsigned long) envp;
78 int retval;
79
80 __asm__ volatile(
81 " R6 = #%4;\n"
82 " trap0(#1);\n"
83 " %0 = R0;\n"
84 : "=r" (retval)
85 : "r" (__a0), "r" (__a1), "r" (__a2), "i" (__NR_execve)
86 );
87
88 return retval;
89}
90EXPORT_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 @@
1/*
2 * System call table for Hexagon
3 *
4 * Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 and
8 * only version 2 as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
18 * 02110-1301, USA.
19 */
20
21#include <linux/syscalls.h>
22#include <linux/signal.h>
23#include <linux/unistd.h>
24
25#include <asm/syscall.h>
26
27#undef __SYSCALL
28#define __SYSCALL(nr, call) [nr] = (call),
29
30void *sys_call_table[__NR_syscalls] = {
31#include <asm/unistd.h>
32};