1 /*
2 * Copyright 2010 Tilera Corporation. All Rights Reserved.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation, version 2.
7 *
8 * This program is distributed in the hope that it will be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
11 * NON INFRINGEMENT. See the GNU General Public License for
12 * more details.
13 *
14 * This file contains various random system calls that
15 * have a non-standard calling sequence on the Linux/TILE
16 * platform.
17 */
18
19 #include <linux/errno.h>
20 #include <linux/sched.h>
21 #include <linux/mm.h>
22 #include <linux/smp.h>
23 #include <linux/syscalls.h>
24 #include <linux/mman.h>
25 #include <linux/file.h>
26 #include <linux/mempolicy.h>
27 #include <linux/binfmts.h>
28 #include <linux/fs.h>
29 #include <linux/compat.h>
30 #include <linux/uaccess.h>
31 #include <linux/signal.h>
32 #include <asm/syscalls.h>
33 #include <asm/pgtable.h>
34 #include <asm/homecache.h>
35 #include <arch/chip.h>
36
SYSCALL_DEFINE0(flush_cache)37 SYSCALL_DEFINE0(flush_cache)
38 {
39 homecache_evict(cpumask_of(smp_processor_id()));
40 return 0;
41 }
42
43 /*
44 * Syscalls that pass 64-bit values on 32-bit systems normally
45 * pass them as (low,high) word packed into the immediately adjacent
46 * registers. If the low word naturally falls on an even register,
47 * our ABI makes it work correctly; if not, we adjust it here.
48 * Handling it here means we don't have to fix uclibc AND glibc AND
49 * any other standard libcs we want to support.
50 */
51
52 #if !defined(__tilegx__) || defined(CONFIG_COMPAT)
53
sys32_readahead(int fd,u32 offset_lo,u32 offset_hi,u32 count)54 ssize_t sys32_readahead(int fd, u32 offset_lo, u32 offset_hi, u32 count)
55 {
56 return sys_readahead(fd, ((loff_t)offset_hi << 32) | offset_lo, count);
57 }
58
sys32_fadvise64_64(int fd,u32 offset_lo,u32 offset_hi,u32 len_lo,u32 len_hi,int advice)59 int sys32_fadvise64_64(int fd, u32 offset_lo, u32 offset_hi,
60 u32 len_lo, u32 len_hi, int advice)
61 {
62 return sys_fadvise64_64(fd, ((loff_t)offset_hi << 32) | offset_lo,
63 ((loff_t)len_hi << 32) | len_lo, advice);
64 }
65
66 #endif /* 32-bit syscall wrappers */
67
68 /* Note: used by the compat code even in 64-bit Linux. */
SYSCALL_DEFINE6(mmap2,unsigned long,addr,unsigned long,len,unsigned long,prot,unsigned long,flags,unsigned long,fd,unsigned long,off_4k)69 SYSCALL_DEFINE6(mmap2, unsigned long, addr, unsigned long, len,
70 unsigned long, prot, unsigned long, flags,
71 unsigned long, fd, unsigned long, off_4k)
72 {
73 #define PAGE_ADJUST (PAGE_SHIFT - 12)
74 if (off_4k & ((1 << PAGE_ADJUST) - 1))
75 return -EINVAL;
76 return sys_mmap_pgoff(addr, len, prot, flags, fd,
77 off_4k >> PAGE_ADJUST);
78 }
79
80 #ifdef __tilegx__
SYSCALL_DEFINE6(mmap,unsigned long,addr,unsigned long,len,unsigned long,prot,unsigned long,flags,unsigned long,fd,off_t,offset)81 SYSCALL_DEFINE6(mmap, unsigned long, addr, unsigned long, len,
82 unsigned long, prot, unsigned long, flags,
83 unsigned long, fd, off_t, offset)
84 {
85 if (offset & ((1 << PAGE_SHIFT) - 1))
86 return -EINVAL;
87 return sys_mmap_pgoff(addr, len, prot, flags, fd,
88 offset >> PAGE_SHIFT);
89 }
90 #endif
91
92
93 /* Provide the actual syscall number to call mapping. */
94 #undef __SYSCALL
95 #define __SYSCALL(nr, call) [nr] = (call),
96
97 #ifndef __tilegx__
98 /* See comments at the top of the file. */
99 #define sys_fadvise64_64 sys32_fadvise64_64
100 #define sys_readahead sys32_readahead
101 #endif
102
103 /* Call the trampolines to manage pt_regs where necessary. */
104 #define sys_execve _sys_execve
105 #define sys_sigaltstack _sys_sigaltstack
106 #define sys_rt_sigreturn _sys_rt_sigreturn
107 #define sys_clone _sys_clone
108 #ifndef __tilegx__
109 #define sys_cmpxchg_badaddr _sys_cmpxchg_badaddr
110 #endif
111
112 /*
113 * Note that we can't include <linux/unistd.h> here since the header
114 * guard will defeat us; <asm/unistd.h> checks for __SYSCALL as well.
115 */
116 void *sys_call_table[__NR_syscalls] = {
117 [0 ... __NR_syscalls-1] = sys_ni_syscall,
118 #include <asm/unistd.h>
119 };
120