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fc4fb2ad CZ |
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 | */ | |
7c0f6ba6 | 18 | #include <linux/uaccess.h> |
1c0350bd | 19 | #include <asm/syscall.h> |
fc4fb2ad CZ |
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> | |
01042607 | 28 | #include <linux/sched/mm.h> |
fc4fb2ad CZ |
29 | #include <linux/shm.h> |
30 | ||
31 | typedef void (*syscall_t)(void); | |
32 | ||
33 | syscall_t sys_call_table[__NR_syscall_count] /* FIXME __cacheline_aligned */= { | |
34 | [0 ... __NR_syscall_count - 1] = (syscall_t)&sys_ni_syscall, | |
35 | ||
fc4fb2ad | 36 | #define __SYSCALL(nr,symbol,nargs) [ nr ] = (syscall_t)symbol, |
2f72d4f6 | 37 | #include <uapi/asm/unistd.h> |
fc4fb2ad CZ |
38 | }; |
39 | ||
de73b6b1 MF |
40 | #define COLOUR_ALIGN(addr, pgoff) \ |
41 | ((((addr) + SHMLBA - 1) & ~(SHMLBA - 1)) + \ | |
42 | (((pgoff) << PAGE_SHIFT) & (SHMLBA - 1))) | |
43 | ||
fc4fb2ad CZ |
44 | asmlinkage long xtensa_shmat(int shmid, char __user *shmaddr, int shmflg) |
45 | { | |
46 | unsigned long ret; | |
47 | long err; | |
48 | ||
079a96ae | 49 | err = do_shmat(shmid, shmaddr, shmflg, &ret, SHMLBA); |
fc4fb2ad CZ |
50 | if (err) |
51 | return err; | |
52 | return (long)ret; | |
53 | } | |
54 | ||
2f72d4f6 CZ |
55 | asmlinkage long xtensa_fadvise64_64(int fd, int advice, |
56 | unsigned long long offset, unsigned long long len) | |
bc671aa9 CZ |
57 | { |
58 | return sys_fadvise64_64(fd, offset, len, advice); | |
59 | } | |
de73b6b1 | 60 | |
d10fa7cf | 61 | #ifdef CONFIG_MMU |
de73b6b1 MF |
62 | unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, |
63 | unsigned long len, unsigned long pgoff, unsigned long flags) | |
64 | { | |
65 | struct vm_area_struct *vmm; | |
66 | ||
67 | if (flags & MAP_FIXED) { | |
68 | /* We do not accept a shared mapping if it would violate | |
69 | * cache aliasing constraints. | |
70 | */ | |
71 | if ((flags & MAP_SHARED) && | |
72 | ((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1))) | |
73 | return -EINVAL; | |
74 | return addr; | |
75 | } | |
76 | ||
77 | if (len > TASK_SIZE) | |
78 | return -ENOMEM; | |
79 | if (!addr) | |
80 | addr = TASK_UNMAPPED_BASE; | |
81 | ||
82 | if (flags & MAP_SHARED) | |
83 | addr = COLOUR_ALIGN(addr, pgoff); | |
84 | else | |
85 | addr = PAGE_ALIGN(addr); | |
86 | ||
87 | for (vmm = find_vma(current->mm, addr); ; vmm = vmm->vm_next) { | |
88 | /* At this point: (!vmm || addr < vmm->vm_end). */ | |
89 | if (TASK_SIZE - len < addr) | |
90 | return -ENOMEM; | |
1be7107f | 91 | if (!vmm || addr + len <= vm_start_gap(vmm)) |
de73b6b1 MF |
92 | return addr; |
93 | addr = vmm->vm_end; | |
94 | if (flags & MAP_SHARED) | |
95 | addr = COLOUR_ALIGN(addr, pgoff); | |
96 | } | |
97 | } | |
d10fa7cf | 98 | #endif |