1 // SPDX-License-Identifier: GPL-2.0-or-later 1
2 /*
3 * Implementation of various system calls for
4 *
5 * Copyright (C) 1995-1996 Gary Thomas (gdt
6 *
7 * Derived from "arch/i386/kernel/sys_i386.c"
8 * Adapted from the i386 version by Gary Thoma
9 * Modified by Cort Dougan (cort@cs.nmt.edu)
10 * and Paul Mackerras (paulus@cs.anu.edu.au).
11 *
12 * This file contains various random system ca
13 * have a non-standard calling sequence on the
14 * platform.
15 */
16
17 #include <linux/errno.h>
18 #include <linux/sched.h>
19 #include <linux/syscalls.h>
20 #include <linux/mm.h>
21 #include <linux/fs.h>
22 #include <linux/smp.h>
23 #include <linux/sem.h>
24 #include <linux/msg.h>
25 #include <linux/shm.h>
26 #include <linux/stat.h>
27 #include <linux/mman.h>
28 #include <linux/sys.h>
29 #include <linux/ipc.h>
30 #include <linux/utsname.h>
31 #include <linux/file.h>
32 #include <linux/personality.h>
33
34 #include <linux/uaccess.h>
35 #include <asm/syscalls.h>
36 #include <asm/time.h>
37 #include <asm/unistd.h>
38
39 static long do_mmap2(unsigned long addr, size_
40 unsigned long prot, unsig
41 unsigned long fd, unsigne
42 {
43 if (!arch_validate_prot(prot, addr))
44 return -EINVAL;
45
46 if (!IS_ALIGNED(off, 1 << shift))
47 return -EINVAL;
48
49 return ksys_mmap_pgoff(addr, len, prot
50 }
51
52 SYSCALL_DEFINE6(mmap2, unsigned long, addr, si
53 unsigned long, prot, unsigned
54 unsigned long, fd, unsigned lo
55 {
56 return do_mmap2(addr, len, prot, flags
57 }
58
59 #ifdef CONFIG_COMPAT
60 COMPAT_SYSCALL_DEFINE6(mmap2,
61 unsigned long, addr, si
62 unsigned long, prot, un
63 unsigned long, fd, unsi
64 {
65 return do_mmap2(addr, len, prot, flags
66 }
67 #endif
68
69 SYSCALL_DEFINE6(mmap, unsigned long, addr, siz
70 unsigned long, prot, unsigned
71 unsigned long, fd, off_t, offs
72 {
73 return do_mmap2(addr, len, prot, flags
74 }
75
76 #ifdef CONFIG_PPC64
77 static long do_ppc64_personality(unsigned long
78 {
79 long ret;
80
81 if (personality(current->personality)
82 && personality(personality) == PER
83 personality = (personality & ~
84 ret = ksys_personality(personality);
85 if (personality(ret) == PER_LINUX32)
86 ret = (ret & ~PER_MASK) | PER_
87 return ret;
88 }
89
90 SYSCALL_DEFINE1(ppc64_personality, unsigned lo
91 {
92 return do_ppc64_personality(personalit
93 }
94
95 #ifdef CONFIG_COMPAT
96 COMPAT_SYSCALL_DEFINE1(ppc64_personality, unsi
97 {
98 return do_ppc64_personality(personalit
99 }
100 #endif /* CONFIG_COMPAT */
101 #endif /* CONFIG_PPC64 */
102
103 SYSCALL_DEFINE6(ppc_fadvise64_64,
104 int, fd, int, advice, u32, off
105 u32, len_high, u32, len_low)
106 {
107 return ksys_fadvise64_64(fd, merge_64(
108 merge_64(len_
109 }
110
111 SYSCALL_DEFINE0(switch_endian)
112 {
113 struct thread_info *ti;
114
115 regs_set_return_msr(current->thread.re
116 current->threa
117
118 /*
119 * Set TIF_RESTOREALL so that r3 isn't
120 * userspace. That also has the effect
121 * GPRs, so we saved them on the way i
122 */
123 ti = current_thread_info();
124 ti->flags |= _TIF_RESTOREALL;
125
126 return 0;
127 }
128
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