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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
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}
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
125void do_show_syscall(unsigned long r3, unsigned long r4, unsigned long r5,
126 unsigned long r6, unsigned long r7, unsigned long r8,
127 struct pt_regs *regs)
128{
129 printk("syscall %ld(%lx, %lx, %lx, %lx, %lx, %lx) regs=%p current=%p"
130 " cpu=%d\n", regs->gpr[0], r3, r4, r5, r6, r7, r8, regs,
131 current, smp_processor_id());
132}
133
134void do_show_syscall_exit(unsigned long r3)
135{
136 printk(" -> %lx, current=%p cpu=%d\n", r3, current, smp_processor_id());
137}