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 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);
56 out:
57 return ret;
58 }
59
SYSCALL_DEFINE6(mmap2,unsigned long,addr,size_t,len,unsigned long,prot,unsigned long,flags,unsigned long,fd,unsigned long,pgoff)60 SYSCALL_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
SYSCALL_DEFINE6(mmap,unsigned long,addr,size_t,len,unsigned long,prot,unsigned long,flags,unsigned long,fd,off_t,offset)67 SYSCALL_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 */
81 int
ppc_select(int n,fd_set __user * inp,fd_set __user * outp,fd_set __user * exp,struct __kernel_old_timeval __user * tvp)82 ppc_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
ppc64_personality(unsigned long personality)100 long 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
ppc_fadvise64_64(int fd,int advice,u32 offset_high,u32 offset_low,u32 len_high,u32 len_low)114 long 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
SYSCALL_DEFINE0(switch_endian)121 SYSCALL_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 }
137