1 /*
2 * arch/xtensa/kernel/syscall.c
3 *
4 * This file is subject to the terms and conditions of the GNU General Public
5 * License. See the file "COPYING" in the main directory of this archive
6 * for more details.
7 *
8 * Copyright (C) 2001 - 2005 Tensilica Inc.
9 * Copyright (C) 2000 Silicon Graphics, Inc.
10 * Copyright (C) 1995 - 2000 by Ralf Baechle
11 *
12 * Joe Taylor <joe@tensilica.com, joetylr@yahoo.com>
13 * Marc Gauthier <marc@tensilica.com, marc@alumni.uwaterloo.ca>
14 * Chris Zankel <chris@zankel.net>
15 * Kevin Chea
16 *
17 */
18 #include <asm/uaccess.h>
19 #include <asm/syscall.h>
20 #include <asm/unistd.h>
21 #include <linux/linkage.h>
22 #include <linux/stringify.h>
23 #include <linux/errno.h>
24 #include <linux/syscalls.h>
25 #include <linux/file.h>
26 #include <linux/fs.h>
27 #include <linux/mman.h>
28 #include <linux/shm.h>
29
30 typedef void (*syscall_t)(void);
31
32 syscall_t sys_call_table[__NR_syscall_count] /* FIXME __cacheline_aligned */= {
33 [0 ... __NR_syscall_count - 1] = (syscall_t)&sys_ni_syscall,
34
35 #define __SYSCALL(nr,symbol,nargs) [ nr ] = (syscall_t)symbol,
36 #include <uapi/asm/unistd.h>
37 };
38
39 #define COLOUR_ALIGN(addr, pgoff) \
40 ((((addr) + SHMLBA - 1) & ~(SHMLBA - 1)) + \
41 (((pgoff) << PAGE_SHIFT) & (SHMLBA - 1)))
42
xtensa_shmat(int shmid,char __user * shmaddr,int shmflg)43 asmlinkage long xtensa_shmat(int shmid, char __user *shmaddr, int shmflg)
44 {
45 unsigned long ret;
46 long err;
47
48 err = do_shmat(shmid, shmaddr, shmflg, &ret, SHMLBA);
49 if (err)
50 return err;
51 return (long)ret;
52 }
53
xtensa_fadvise64_64(int fd,int advice,unsigned long long offset,unsigned long long len)54 asmlinkage long xtensa_fadvise64_64(int fd, int advice,
55 unsigned long long offset, unsigned long long len)
56 {
57 return sys_fadvise64_64(fd, offset, len, advice);
58 }
59
60 #ifdef CONFIG_MMU
arch_get_unmapped_area(struct file * filp,unsigned long addr,unsigned long len,unsigned long pgoff,unsigned long flags)61 unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr,
62 unsigned long len, unsigned long pgoff, unsigned long flags)
63 {
64 struct vm_area_struct *vmm;
65
66 if (flags & MAP_FIXED) {
67 /* We do not accept a shared mapping if it would violate
68 * cache aliasing constraints.
69 */
70 if ((flags & MAP_SHARED) &&
71 ((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1)))
72 return -EINVAL;
73 return addr;
74 }
75
76 if (len > TASK_SIZE)
77 return -ENOMEM;
78 if (!addr)
79 addr = TASK_UNMAPPED_BASE;
80
81 if (flags & MAP_SHARED)
82 addr = COLOUR_ALIGN(addr, pgoff);
83 else
84 addr = PAGE_ALIGN(addr);
85
86 for (vmm = find_vma(current->mm, addr); ; vmm = vmm->vm_next) {
87 /* At this point: (!vmm || addr < vmm->vm_end). */
88 if (TASK_SIZE - len < addr)
89 return -ENOMEM;
90 if (!vmm || addr + len <= vm_start_gap(vmm))
91 return addr;
92 addr = vmm->vm_end;
93 if (flags & MAP_SHARED)
94 addr = COLOUR_ALIGN(addr, pgoff);
95 }
96 }
97 #endif
98