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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/init.h>
38#include <linux/personality.h>
39
40#include <asm/uaccess.h>
41#include <asm/syscalls.h>
42#include <asm/time.h>
43#include <asm/unistd.h>
44
45static inline unsigned long do_mmap2(unsigned long addr, size_t len,
46 unsigned long prot, unsigned long flags,
47 unsigned long fd, unsigned long off, int shift)
48{
49 unsigned long ret = -EINVAL;
50
51 if (!arch_validate_prot(prot))
52 goto out;
53
54 if (shift) {
55 if (off & ((1 << shift) - 1))
56 goto out;
57 off >>= shift;
58 }
59
60 ret = sys_mmap_pgoff(addr, len, prot, flags, fd, off);
61out:
62 return ret;
63}
64
65unsigned long sys_mmap2(unsigned long addr, size_t len,
66 unsigned long prot, unsigned long flags,
67 unsigned long fd, unsigned long pgoff)
68{
69 return do_mmap2(addr, len, prot, flags, fd, pgoff, PAGE_SHIFT-12);
70}
71
72unsigned long sys_mmap(unsigned long addr, size_t len,
73 unsigned long prot, unsigned long flags,
74 unsigned long fd, off_t offset)
75{
76 return do_mmap2(addr, len, prot, flags, fd, offset, PAGE_SHIFT);
77}
78
79#ifdef CONFIG_PPC32
80/*
81 * Due to some executables calling the wrong select we sometimes
82 * get wrong args. This determines how the args are being passed
83 * (a single ptr to them all args passed) then calls
84 * sys_select() with the appropriate args. -- Cort
85 */
86int
87ppc_select(int n, fd_set __user *inp, fd_set __user *outp, fd_set __user *exp, struct timeval __user *tvp)
88{
89 if ( (unsigned long)n >= 4096 )
90 {
91 unsigned long __user *buffer = (unsigned long __user *)n;
92 if (!access_ok(VERIFY_READ, buffer, 5*sizeof(unsigned long))
93 || __get_user(n, buffer)
94 || __get_user(inp, ((fd_set __user * __user *)(buffer+1)))
95 || __get_user(outp, ((fd_set __user * __user *)(buffer+2)))
96 || __get_user(exp, ((fd_set __user * __user *)(buffer+3)))
97 || __get_user(tvp, ((struct timeval __user * __user *)(buffer+4))))
98 return -EFAULT;
99 }
100 return sys_select(n, inp, outp, exp, tvp);
101}
102#endif
103
104#ifdef CONFIG_PPC64
105long ppc64_personality(unsigned long personality)
106{
107 long ret;
108
109 if (personality(current->personality) == PER_LINUX32
110 && personality == PER_LINUX)
111 personality = PER_LINUX32;
112 ret = sys_personality(personality);
113 if (ret == PER_LINUX32)
114 ret = PER_LINUX;
115 return ret;
116}
117#endif
118
119long ppc_fadvise64_64(int fd, int advice, u32 offset_high, u32 offset_low,
120 u32 len_high, u32 len_low)
121{
122 return sys_fadvise64(fd, (u64)offset_high << 32 | offset_low,
123 (u64)len_high << 32 | len_low, advice);
124}
125
126void do_show_syscall(unsigned long r3, unsigned long r4, unsigned long r5,
127 unsigned long r6, unsigned long r7, unsigned long r8,
128 struct pt_regs *regs)
129{
130 printk("syscall %ld(%lx, %lx, %lx, %lx, %lx, %lx) regs=%p current=%p"
131 " cpu=%d\n", regs->gpr[0], r3, r4, r5, r6, r7, r8, regs,
132 current, smp_processor_id());
133}
134
135void do_show_syscall_exit(unsigned long r3)
136{
137 printk(" -> %lx, current=%p cpu=%d\n", r3, current, smp_processor_id());
138}