1 /* 1
2 * arch/xtensa/kernel/syscall.c
3 *
4 * This file is subject to the terms and condi
5 * License. See the file "COPYING" in the mai
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@yaho
13 * Marc Gauthier <marc@tensilica.com, marc@alu
14 * Chris Zankel <chris@zankel.net>
15 * Kevin Chea
16 *
17 */
18 #include <linux/uaccess.h>
19 #include <asm/syscall.h>
20 #include <linux/linkage.h>
21 #include <linux/stringify.h>
22 #include <linux/errno.h>
23 #include <linux/syscalls.h>
24 #include <linux/file.h>
25 #include <linux/fs.h>
26 #include <linux/mman.h>
27 #include <linux/sched/mm.h>
28 #include <linux/shm.h>
29
30 syscall_t sys_call_table[] /* FIXME __cachelin
31 #define __SYSCALL(nr, entry) (syscall_t)ent
32 #include <asm/syscall_table.h>
33 };
34
35 #define COLOUR_ALIGN(addr, pgoff) \
36 ((((addr) + SHMLBA - 1) & ~(SHMLBA - 1
37 (((pgoff) << PAGE_SHIFT) & (SHMLBA -
38
39 asmlinkage long xtensa_shmat(int shmid, char _
40 {
41 unsigned long ret;
42 long err;
43
44 err = do_shmat(shmid, shmaddr, shmflg,
45 if (err)
46 return err;
47 return (long)ret;
48 }
49
50 asmlinkage long xtensa_fadvise64_64(int fd, in
51 unsigned long long offset, uns
52 {
53 return ksys_fadvise64_64(fd, offset, l
54 }
55
56 #ifdef CONFIG_MMU
57 unsigned long arch_get_unmapped_area(struct fi
58 unsigned long len, unsigned lo
59 vm_flags_t vm_flags)
60 {
61 struct vm_area_struct *vmm;
62 struct vma_iterator vmi;
63
64 if (flags & MAP_FIXED) {
65 /* We do not accept a shared m
66 * cache aliasing constraints.
67 */
68 if ((flags & MAP_SHARED) &&
69 ((addr - (pgof
70 return -EINVAL;
71 return addr;
72 }
73
74 if (len > TASK_SIZE)
75 return -ENOMEM;
76 if (!addr)
77 addr = TASK_UNMAPPED_BASE;
78
79 if (flags & MAP_SHARED)
80 addr = COLOUR_ALIGN(addr, pgof
81 else
82 addr = PAGE_ALIGN(addr);
83
84 vma_iter_init(&vmi, current->mm, addr)
85 for_each_vma(vmi, vmm) {
86 /* At this point: (addr < vmm
87 if (addr + len <= vm_start_gap
88 break;
89
90 addr = vmm->vm_end;
91 if (flags & MAP_SHARED)
92 addr = COLOUR_ALIGN(ad
93 }
94
95 if (TASK_SIZE - len < addr)
96 return -ENOMEM;
97
98 return addr;
99 }
100 #endif
101
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