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 (gdt@linuxppc.org)
6 *
7 * Derived from "arch/i386/kernel/sys_i386.c"
8 * Adapted from the i386 version by Gary Thomas
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 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
39 static 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
52 SYSCALL_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
60 COMPAT_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
69 SYSCALL_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
77 static 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
90 SYSCALL_DEFINE1(ppc64_personality, unsigned long, personality)
91 {
92 return do_ppc64_personality(personality);
93 }
94
95 #ifdef CONFIG_COMPAT
96 COMPAT_SYSCALL_DEFINE1(ppc64_personality, unsigned long, personality)
97 {
98 return do_ppc64_personality(personality);
99 }
100 #endif /* CONFIG_COMPAT */
101 #endif /* CONFIG_PPC64 */
102
103 SYSCALL_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
111 SYSCALL_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 }
128
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