1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * sys_ppc32.c: Conversion between 32bit and 64bit native syscalls.
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  * These routines maintain argument size conversion between 32bit and 64bit
10  * environment.
11  */
12 
13 #include <linux/kernel.h>
14 #include <linux/sched.h>
15 #include <linux/fs.h>
16 #include <linux/mm.h>
17 #include <linux/file.h>
18 #include <linux/signal.h>
19 #include <linux/resource.h>
20 #include <linux/times.h>
21 #include <linux/smp.h>
22 #include <linux/sem.h>
23 #include <linux/msg.h>
24 #include <linux/shm.h>
25 #include <linux/poll.h>
26 #include <linux/personality.h>
27 #include <linux/stat.h>
28 #include <linux/mman.h>
29 #include <linux/in.h>
30 #include <linux/syscalls.h>
31 #include <linux/unistd.h>
32 #include <linux/sysctl.h>
33 #include <linux/binfmts.h>
34 #include <linux/security.h>
35 #include <linux/compat.h>
36 #include <linux/ptrace.h>
37 #include <linux/elf.h>
38 #include <linux/ipc.h>
39 #include <linux/slab.h>
40 
41 #include <asm/ptrace.h>
42 #include <asm/types.h>
43 #include <linux/uaccess.h>
44 #include <asm/unistd.h>
45 #include <asm/time.h>
46 #include <asm/mmu_context.h>
47 #include <asm/ppc-pci.h>
48 #include <asm/syscalls.h>
49 #include <asm/switch_to.h>
50 
compat_sys_mmap2(unsigned long addr,size_t len,unsigned long prot,unsigned long flags,unsigned long fd,unsigned long pgoff)51 unsigned long compat_sys_mmap2(unsigned long addr, size_t len,
52 			  unsigned long prot, unsigned long flags,
53 			  unsigned long fd, unsigned long pgoff)
54 {
55 	/* This should remain 12 even if PAGE_SIZE changes */
56 	return sys_mmap(addr, len, prot, flags, fd, pgoff << 12);
57 }
58 
59 /*
60  * long long munging:
61  * The 32 bit ABI passes long longs in an odd even register pair.
62  * High and low parts are swapped depending on endian mode,
63  * so define a macro (similar to mips linux32) to handle that.
64  */
65 #ifdef __LITTLE_ENDIAN__
66 #define merge_64(low, high) ((u64)high << 32) | low
67 #else
68 #define merge_64(high, low) ((u64)high << 32) | low
69 #endif
70 
compat_sys_pread64(unsigned int fd,char __user * ubuf,compat_size_t count,u32 reg6,u32 pos1,u32 pos2)71 compat_ssize_t compat_sys_pread64(unsigned int fd, char __user *ubuf, compat_size_t count,
72 			     u32 reg6, u32 pos1, u32 pos2)
73 {
74 	return ksys_pread64(fd, ubuf, count, merge_64(pos1, pos2));
75 }
76 
compat_sys_pwrite64(unsigned int fd,const char __user * ubuf,compat_size_t count,u32 reg6,u32 pos1,u32 pos2)77 compat_ssize_t compat_sys_pwrite64(unsigned int fd, const char __user *ubuf, compat_size_t count,
78 			      u32 reg6, u32 pos1, u32 pos2)
79 {
80 	return ksys_pwrite64(fd, ubuf, count, merge_64(pos1, pos2));
81 }
82 
compat_sys_readahead(int fd,u32 r4,u32 offset1,u32 offset2,u32 count)83 compat_ssize_t compat_sys_readahead(int fd, u32 r4, u32 offset1, u32 offset2, u32 count)
84 {
85 	return ksys_readahead(fd, merge_64(offset1, offset2), count);
86 }
87 
compat_sys_truncate64(const char __user * path,u32 reg4,unsigned long len1,unsigned long len2)88 asmlinkage int compat_sys_truncate64(const char __user * path, u32 reg4,
89 				unsigned long len1, unsigned long len2)
90 {
91 	return ksys_truncate(path, merge_64(len1, len2));
92 }
93 
compat_sys_fallocate(int fd,int mode,u32 offset1,u32 offset2,u32 len1,u32 len2)94 asmlinkage long compat_sys_fallocate(int fd, int mode, u32 offset1, u32 offset2,
95 				     u32 len1, u32 len2)
96 {
97 	return ksys_fallocate(fd, mode, ((loff_t)offset1 << 32) | offset2,
98 			     merge_64(len1, len2));
99 }
100 
compat_sys_ftruncate64(unsigned int fd,u32 reg4,unsigned long len1,unsigned long len2)101 asmlinkage int compat_sys_ftruncate64(unsigned int fd, u32 reg4, unsigned long len1,
102 				 unsigned long len2)
103 {
104 	return ksys_ftruncate(fd, merge_64(len1, len2));
105 }
106 
ppc32_fadvise64(int fd,u32 unused,u32 offset1,u32 offset2,size_t len,int advice)107 long ppc32_fadvise64(int fd, u32 unused, u32 offset1, u32 offset2,
108 		     size_t len, int advice)
109 {
110 	return ksys_fadvise64_64(fd, merge_64(offset1, offset2), len,
111 				 advice);
112 }
113 
compat_sys_sync_file_range2(int fd,unsigned int flags,unsigned offset1,unsigned offset2,unsigned nbytes1,unsigned nbytes2)114 asmlinkage long compat_sys_sync_file_range2(int fd, unsigned int flags,
115 				   unsigned offset1, unsigned offset2,
116 				   unsigned nbytes1, unsigned nbytes2)
117 {
118 	loff_t offset = merge_64(offset1, offset2);
119 	loff_t nbytes = merge_64(nbytes1, nbytes2);
120 
121 	return ksys_sync_file_range(fd, offset, nbytes, flags);
122 }
123