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, pgoff: 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, off: 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: 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, off: 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, offset: merge_64(offset_high, offset_low), |
108 | len: 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 | |