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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#include <asm/asm-prototypes.h>
39
40static inline long do_mmap2(unsigned long addr, size_t len,
41 unsigned long prot, unsigned long flags,
42 unsigned long fd, unsigned long off, int shift)
43{
44 long ret = -EINVAL;
45
46 if (!arch_validate_prot(prot, addr))
47 goto out;
48
49 if (shift) {
50 if (off & ((1 << shift) - 1))
51 goto out;
52 off >>= shift;
53 }
54
55 ret = ksys_mmap_pgoff(addr, len, prot, flags, fd, off);
56out:
57 return ret;
58}
59
60SYSCALL_DEFINE6(mmap2, unsigned long, addr, size_t, len,
61 unsigned long, prot, unsigned long, flags,
62 unsigned long, fd, unsigned long, pgoff)
63{
64 return do_mmap2(addr, len, prot, flags, fd, pgoff, PAGE_SHIFT-12);
65}
66
67SYSCALL_DEFINE6(mmap, unsigned long, addr, size_t, len,
68 unsigned long, prot, unsigned long, flags,
69 unsigned long, fd, off_t, offset)
70{
71 return do_mmap2(addr, len, prot, flags, fd, offset, PAGE_SHIFT);
72}
73
74#ifdef CONFIG_PPC32
75/*
76 * Due to some executables calling the wrong select we sometimes
77 * get wrong args. This determines how the args are being passed
78 * (a single ptr to them all args passed) then calls
79 * sys_select() with the appropriate args. -- Cort
80 */
81int
82ppc_select(int n, fd_set __user *inp, fd_set __user *outp, fd_set __user *exp, struct __kernel_old_timeval __user *tvp)
83{
84 if ( (unsigned long)n >= 4096 )
85 {
86 unsigned long __user *buffer = (unsigned long __user *)n;
87 if (!access_ok(buffer, 5*sizeof(unsigned long))
88 || __get_user(n, buffer)
89 || __get_user(inp, ((fd_set __user * __user *)(buffer+1)))
90 || __get_user(outp, ((fd_set __user * __user *)(buffer+2)))
91 || __get_user(exp, ((fd_set __user * __user *)(buffer+3)))
92 || __get_user(tvp, ((struct __kernel_old_timeval __user * __user *)(buffer+4))))
93 return -EFAULT;
94 }
95 return sys_select(n, inp, outp, exp, tvp);
96}
97#endif
98
99#ifdef CONFIG_PPC64
100long ppc64_personality(unsigned long personality)
101{
102 long ret;
103
104 if (personality(current->personality) == PER_LINUX32
105 && personality(personality) == PER_LINUX)
106 personality = (personality & ~PER_MASK) | PER_LINUX32;
107 ret = sys_personality(personality);
108 if (personality(ret) == PER_LINUX32)
109 ret = (ret & ~PER_MASK) | PER_LINUX;
110 return ret;
111}
112#endif
113
114long ppc_fadvise64_64(int fd, int advice, u32 offset_high, u32 offset_low,
115 u32 len_high, u32 len_low)
116{
117 return ksys_fadvise64_64(fd, (u64)offset_high << 32 | offset_low,
118 (u64)len_high << 32 | len_low, advice);
119}
120
121SYSCALL_DEFINE0(switch_endian)
122{
123 struct thread_info *ti;
124
125 current->thread.regs->msr ^= MSR_LE;
126
127 /*
128 * Set TIF_RESTOREALL so that r3 isn't clobbered on return to
129 * userspace. That also has the effect of restoring the non-volatile
130 * GPRs, so we saved them on the way in here.
131 */
132 ti = current_thread_info();
133 ti->flags |= _TIF_RESTOREALL;
134
135 return 0;
136}
1/*
2 * Implementation of various system calls for Linux/PowerPC
3 *
4 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
5 *
6 * Derived from "arch/i386/kernel/sys_i386.c"
7 * Adapted from the i386 version by Gary Thomas
8 * Modified by Cort Dougan (cort@cs.nmt.edu)
9 * and Paul Mackerras (paulus@cs.anu.edu.au).
10 *
11 * This file contains various random system calls that
12 * have a non-standard calling sequence on the Linux/PPC
13 * platform.
14 *
15 * This program is free software; you can redistribute it and/or
16 * modify it under the terms of the GNU General Public License
17 * as published by the Free Software Foundation; either version
18 * 2 of the License, or (at your option) any later version.
19 *
20 */
21
22#include <linux/errno.h>
23#include <linux/sched.h>
24#include <linux/syscalls.h>
25#include <linux/mm.h>
26#include <linux/fs.h>
27#include <linux/smp.h>
28#include <linux/sem.h>
29#include <linux/msg.h>
30#include <linux/shm.h>
31#include <linux/stat.h>
32#include <linux/mman.h>
33#include <linux/sys.h>
34#include <linux/ipc.h>
35#include <linux/utsname.h>
36#include <linux/file.h>
37#include <linux/personality.h>
38
39#include <asm/uaccess.h>
40#include <asm/syscalls.h>
41#include <asm/time.h>
42#include <asm/unistd.h>
43
44static inline unsigned long do_mmap2(unsigned long addr, size_t len,
45 unsigned long prot, unsigned long flags,
46 unsigned long fd, unsigned long off, int shift)
47{
48 unsigned long ret = -EINVAL;
49
50 if (!arch_validate_prot(prot))
51 goto out;
52
53 if (shift) {
54 if (off & ((1 << shift) - 1))
55 goto out;
56 off >>= shift;
57 }
58
59 ret = sys_mmap_pgoff(addr, len, prot, flags, fd, off);
60out:
61 return ret;
62}
63
64unsigned long sys_mmap2(unsigned long addr, size_t len,
65 unsigned long prot, unsigned long flags,
66 unsigned long fd, unsigned long pgoff)
67{
68 return do_mmap2(addr, len, prot, flags, fd, pgoff, PAGE_SHIFT-12);
69}
70
71unsigned long sys_mmap(unsigned long addr, size_t len,
72 unsigned long prot, unsigned long flags,
73 unsigned long fd, off_t offset)
74{
75 return do_mmap2(addr, len, prot, flags, fd, offset, PAGE_SHIFT);
76}
77
78#ifdef CONFIG_PPC32
79/*
80 * Due to some executables calling the wrong select we sometimes
81 * get wrong args. This determines how the args are being passed
82 * (a single ptr to them all args passed) then calls
83 * sys_select() with the appropriate args. -- Cort
84 */
85int
86ppc_select(int n, fd_set __user *inp, fd_set __user *outp, fd_set __user *exp, struct timeval __user *tvp)
87{
88 if ( (unsigned long)n >= 4096 )
89 {
90 unsigned long __user *buffer = (unsigned long __user *)n;
91 if (!access_ok(VERIFY_READ, buffer, 5*sizeof(unsigned long))
92 || __get_user(n, buffer)
93 || __get_user(inp, ((fd_set __user * __user *)(buffer+1)))
94 || __get_user(outp, ((fd_set __user * __user *)(buffer+2)))
95 || __get_user(exp, ((fd_set __user * __user *)(buffer+3)))
96 || __get_user(tvp, ((struct timeval __user * __user *)(buffer+4))))
97 return -EFAULT;
98 }
99 return sys_select(n, inp, outp, exp, tvp);
100}
101#endif
102
103#ifdef CONFIG_PPC64
104long ppc64_personality(unsigned long personality)
105{
106 long ret;
107
108 if (personality(current->personality) == PER_LINUX32
109 && personality(personality) == PER_LINUX)
110 personality = (personality & ~PER_MASK) | PER_LINUX32;
111 ret = sys_personality(personality);
112 if (personality(ret) == PER_LINUX32)
113 ret = (ret & ~PER_MASK) | PER_LINUX;
114 return ret;
115}
116#endif
117
118long ppc_fadvise64_64(int fd, int advice, u32 offset_high, u32 offset_low,
119 u32 len_high, u32 len_low)
120{
121 return sys_fadvise64(fd, (u64)offset_high << 32 | offset_low,
122 (u64)len_high << 32 | len_low, advice);
123}
124
125long sys_switch_endian(void)
126{
127 struct thread_info *ti;
128
129 current->thread.regs->msr ^= MSR_LE;
130
131 /*
132 * Set TIF_RESTOREALL so that r3 isn't clobbered on return to
133 * userspace. That also has the effect of restoring the non-volatile
134 * GPRs, so we saved them on the way in here.
135 */
136 ti = current_thread_info();
137 ti->flags |= _TIF_RESTOREALL;
138
139 return 0;
140}