projects/linux·blob master · refs

127 lines · 3.3 KiB

1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Implementation of various system calls for Linux/PowerPC
4 *
5 * Copyright (C) 1995-1996 Gary Thomas ([email protected])
6 *
7 * Derived from "arch/i386/kernel/sys_i386.c"
8 * Adapted from the i386 version by Gary Thomas
9 * Modified by Cort Dougan ([email protected])
10 * and Paul Mackerras ([email protected]).
11 *
12 * This file contains various random system calls that
13 * have a non-standard calling sequence on the Linux/PPC
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
39static long do_mmap2(unsigned long addr, size_t len,
40 unsigned long prot, unsigned long flags,
41 unsigned long fd, unsigned long off, int shift)
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, flags, fd, off >> shift);
50}
51
52SYSCALL_DEFINE6(mmap2, unsigned long, addr, size_t, len,
53 unsigned long, prot, unsigned long, flags,
54 unsigned long, fd, unsigned long, pgoff)
55{
56 return do_mmap2(addr, len, prot, flags, fd, pgoff, PAGE_SHIFT-12);
57}
58
59#ifdef CONFIG_COMPAT
60COMPAT_SYSCALL_DEFINE6(mmap2,
61 unsigned long, addr, size_t, len,
62 unsigned long, prot, unsigned long, flags,
63 unsigned long, fd, unsigned long, off_4k)
64{
65 return do_mmap2(addr, len, prot, flags, fd, off_4k, PAGE_SHIFT-12);
66}
67#endif
68
69SYSCALL_DEFINE6(mmap, unsigned long, addr, size_t, len,
70 unsigned long, prot, unsigned long, flags,
71 unsigned long, fd, off_t, offset)
72{
73 return do_mmap2(addr, len, prot, flags, fd, offset, PAGE_SHIFT);
74}
75
76#ifdef CONFIG_PPC64
77static long do_ppc64_personality(unsigned long personality)
78{
79 long ret;
80
81 if (personality(current->personality) == PER_LINUX32
82 && personality(personality) == PER_LINUX)
83 personality = (personality & ~PER_MASK) | PER_LINUX32;
84 ret = ksys_personality(personality);
85 if (personality(ret) == PER_LINUX32)
86 ret = (ret & ~PER_MASK) | PER_LINUX;
87 return ret;
88}
89
90SYSCALL_DEFINE1(ppc64_personality, unsigned long, personality)
91{
92 return do_ppc64_personality(personality);
93}
94
95#ifdef CONFIG_COMPAT
96COMPAT_SYSCALL_DEFINE1(ppc64_personality, unsigned long, personality)
97{
98 return do_ppc64_personality(personality);
99}
100#endif /* CONFIG_COMPAT */
101#endif /* CONFIG_PPC64 */
102
103SYSCALL_DEFINE6(ppc_fadvise64_64,
104 int, fd, int, advice, u32, offset_high, u32, offset_low,
105 u32, len_high, u32, len_low)
106{
107 return ksys_fadvise64_64(fd, merge_64(offset_high, offset_low),
108 merge_64(len_high, len_low), advice);
109}
110
111SYSCALL_DEFINE0(switch_endian)
112{
113 struct thread_info *ti;
114
115 regs_set_return_msr(current->thread.regs,
116 current->thread.regs->msr ^ MSR_LE);
117
118 /*
119 * Set TIF_RESTOREALL so that r3 isn't clobbered on return to
120 * userspace. That also has the effect of restoring the non-volatile
121 * GPRs, so we saved them on the way in here.
122 */
123 ti = current_thread_info();
124 ti->flags |= _TIF_RESTOREALL;
125
126 return 0;
127}