1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * sys_ppc32.c: 32-bit system calls with complex calling conventions.
4 *
5 * Copyright (C) 2001 IBM
6 * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
7 * Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu)
8 *
9 * 32-bit system calls with 64-bit arguments pass those in register pairs.
10 * This must be specially dealt with on 64-bit kernels. The compat_arg_u64_dual
11 * in generic compat syscalls is not always usable because the register
12 * pairing is constrained depending on preceding arguments.
13 *
14 * An analogous problem exists on 32-bit kernels with ARCH_HAS_SYSCALL_WRAPPER,
15 * the defined system call functions take the pt_regs as an argument, and there
16 * is a mapping macro which maps registers to arguments
17 * (SC_POWERPC_REGS_TO_ARGS) which also does not deal with these 64-bit
18 * arguments.
19 *
20 * This file contains these system calls.
21 */
22
23 #include <linux/kernel.h>
24 #include <linux/sched.h>
25 #include <linux/fs.h>
26 #include <linux/mm.h>
27 #include <linux/file.h>
28 #include <linux/signal.h>
29 #include <linux/resource.h>
30 #include <linux/times.h>
31 #include <linux/smp.h>
32 #include <linux/sem.h>
33 #include <linux/msg.h>
34 #include <linux/shm.h>
35 #include <linux/poll.h>
36 #include <linux/personality.h>
37 #include <linux/stat.h>
38 #include <linux/in.h>
39 #include <linux/syscalls.h>
40 #include <linux/unistd.h>
41 #include <linux/sysctl.h>
42 #include <linux/binfmts.h>
43 #include <linux/security.h>
44 #include <linux/compat.h>
45 #include <linux/ptrace.h>
46 #include <linux/elf.h>
47 #include <linux/ipc.h>
48 #include <linux/slab.h>
49
50 #include <asm/ptrace.h>
51 #include <asm/types.h>
52 #include <linux/uaccess.h>
53 #include <asm/unistd.h>
54 #include <asm/time.h>
55 #include <asm/mmu_context.h>
56 #include <asm/ppc-pci.h>
57 #include <asm/syscalls.h>
58 #include <asm/switch_to.h>
59
60 #ifdef CONFIG_PPC32
61 #define PPC32_SYSCALL_DEFINE4 SYSCALL_DEFINE4
62 #define PPC32_SYSCALL_DEFINE5 SYSCALL_DEFINE5
63 #define PPC32_SYSCALL_DEFINE6 SYSCALL_DEFINE6
64 #else
65 #define PPC32_SYSCALL_DEFINE4 COMPAT_SYSCALL_DEFINE4
66 #define PPC32_SYSCALL_DEFINE5 COMPAT_SYSCALL_DEFINE5
67 #define PPC32_SYSCALL_DEFINE6 COMPAT_SYSCALL_DEFINE6
68 #endif
69
70 PPC32_SYSCALL_DEFINE6(ppc_pread64,
71 unsigned int, fd,
72 char __user *, ubuf, compat_size_t, count,
73 u32, reg6, u32, pos1, u32, pos2)
74 {
75 return ksys_pread64(fd, ubuf, count, merge_64(pos1, pos2));
76 }
77
78 PPC32_SYSCALL_DEFINE6(ppc_pwrite64,
79 unsigned int, fd,
80 const char __user *, ubuf, compat_size_t, count,
81 u32, reg6, u32, pos1, u32, pos2)
82 {
83 return ksys_pwrite64(fd, ubuf, count, merge_64(pos1, pos2));
84 }
85
86 PPC32_SYSCALL_DEFINE5(ppc_readahead,
87 int, fd, u32, r4,
88 u32, offset1, u32, offset2, u32, count)
89 {
90 return ksys_readahead(fd, merge_64(offset1, offset2), count);
91 }
92
93 PPC32_SYSCALL_DEFINE4(ppc_truncate64,
94 const char __user *, path, u32, reg4,
95 unsigned long, len1, unsigned long, len2)
96 {
97 return ksys_truncate(path, merge_64(len1, len2));
98 }
99
100 PPC32_SYSCALL_DEFINE4(ppc_ftruncate64,
101 unsigned int, fd, u32, reg4,
102 unsigned long, len1, unsigned long, len2)
103 {
104 return ksys_ftruncate(fd, merge_64(len1, len2));
105 }
106
107 PPC32_SYSCALL_DEFINE6(ppc32_fadvise64,
108 int, fd, u32, unused, u32, offset1, u32, offset2,
109 size_t, len, int, advice)
110 {
111 return ksys_fadvise64_64(fd, merge_64(offset1, offset2), len,
112 advice);
113 }
114
115 PPC32_SYSCALL_DEFINE6(ppc_sync_file_range2,
116 int, fd, unsigned int, flags,
117 unsigned int, offset1, unsigned int, offset2,
118 unsigned int, nbytes1, unsigned int, nbytes2)
119 {
120 loff_t offset = merge_64(offset1, offset2);
121 loff_t nbytes = merge_64(nbytes1, nbytes2);
122
123 return ksys_sync_file_range(fd, offset, nbytes, flags);
124 }
125
126 #ifdef CONFIG_PPC32
127 SYSCALL_DEFINE6(ppc_fallocate,
128 int, fd, int, mode,
129 u32, offset1, u32, offset2, u32, len1, u32, len2)
130 {
131 return ksys_fallocate(fd, mode,
132 merge_64(offset1, offset2),
133 merge_64(len1, len2));
134 }
135 #endif
136
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