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
do_mmap2(unsigned long addr,size_t len,unsigned long prot,unsigned long flags,unsigned long fd,unsigned long off,int shift)40 static 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 if (!arch_validate_prot(prot, addr))
45 return -EINVAL;
46
47 if (!IS_ALIGNED(off, 1 << shift))
48 return -EINVAL;
49
50 return ksys_mmap_pgoff(addr, len, prot, flags, fd, off >> shift);
51 }
52
SYSCALL_DEFINE6(mmap2,unsigned long,addr,size_t,len,unsigned long,prot,unsigned long,flags,unsigned long,fd,unsigned long,pgoff)53 SYSCALL_DEFINE6(mmap2, unsigned long, addr, size_t, len,
54 unsigned long, prot, unsigned long, flags,
55 unsigned long, fd, unsigned long, pgoff)
56 {
57 return do_mmap2(addr, len, prot, flags, fd, pgoff, PAGE_SHIFT-12);
58 }
59
SYSCALL_DEFINE6(mmap,unsigned long,addr,size_t,len,unsigned long,prot,unsigned long,flags,unsigned long,fd,off_t,offset)60 SYSCALL_DEFINE6(mmap, unsigned long, addr, size_t, len,
61 unsigned long, prot, unsigned long, flags,
62 unsigned long, fd, off_t, offset)
63 {
64 return do_mmap2(addr, len, prot, flags, fd, offset, PAGE_SHIFT);
65 }
66
67 #ifdef CONFIG_PPC32
68 /*
69 * Due to some executables calling the wrong select we sometimes
70 * get wrong args. This determines how the args are being passed
71 * (a single ptr to them all args passed) then calls
72 * sys_select() with the appropriate args. -- Cort
73 */
74 int
ppc_select(int n,fd_set __user * inp,fd_set __user * outp,fd_set __user * exp,struct __kernel_old_timeval __user * tvp)75 ppc_select(int n, fd_set __user *inp, fd_set __user *outp, fd_set __user *exp, struct __kernel_old_timeval __user *tvp)
76 {
77 if ( (unsigned long)n >= 4096 )
78 return sys_old_select((void __user *)n);
79
80 return sys_select(n, inp, outp, exp, tvp);
81 }
82 #endif
83
84 #ifdef CONFIG_PPC64
ppc64_personality(unsigned long personality)85 long ppc64_personality(unsigned long personality)
86 {
87 long ret;
88
89 if (personality(current->personality) == PER_LINUX32
90 && personality(personality) == PER_LINUX)
91 personality = (personality & ~PER_MASK) | PER_LINUX32;
92 ret = sys_personality(personality);
93 if (personality(ret) == PER_LINUX32)
94 ret = (ret & ~PER_MASK) | PER_LINUX;
95 return ret;
96 }
97 #endif
98
ppc_fadvise64_64(int fd,int advice,u32 offset_high,u32 offset_low,u32 len_high,u32 len_low)99 long ppc_fadvise64_64(int fd, int advice, u32 offset_high, u32 offset_low,
100 u32 len_high, u32 len_low)
101 {
102 return ksys_fadvise64_64(fd, (u64)offset_high << 32 | offset_low,
103 (u64)len_high << 32 | len_low, advice);
104 }
105
SYSCALL_DEFINE0(switch_endian)106 SYSCALL_DEFINE0(switch_endian)
107 {
108 struct thread_info *ti;
109
110 regs_set_return_msr(current->thread.regs,
111 current->thread.regs->msr ^ MSR_LE);
112
113 /*
114 * Set TIF_RESTOREALL so that r3 isn't clobbered on return to
115 * userspace. That also has the effect of restoring the non-volatile
116 * GPRs, so we saved them on the way in here.
117 */
118 ti = current_thread_info();
119 ti->flags |= _TIF_RESTOREALL;
120
121 return 0;
122 }
123
