xref: /openbmc/linux/arch/powerpc/kernel/sys_ppc32.c (revision ce883a2b)
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 
PPC32_SYSCALL_DEFINE6(ppc_pread64,unsigned int,fd,char __user *,ubuf,compat_size_t,count,u32,reg6,u32,pos1,u32,pos2)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 
PPC32_SYSCALL_DEFINE6(ppc_pwrite64,unsigned int,fd,const char __user *,ubuf,compat_size_t,count,u32,reg6,u32,pos1,u32,pos2)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 
PPC32_SYSCALL_DEFINE5(ppc_readahead,int,fd,u32,r4,u32,offset1,u32,offset2,u32,count)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 
PPC32_SYSCALL_DEFINE4(ppc_truncate64,const char __user *,path,u32,reg4,unsigned long,len1,unsigned long,len2)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 
PPC32_SYSCALL_DEFINE4(ppc_ftruncate64,unsigned int,fd,u32,reg4,unsigned long,len1,unsigned long,len2)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 
PPC32_SYSCALL_DEFINE6(ppc32_fadvise64,int,fd,u32,unused,u32,offset1,u32,offset2,size_t,len,int,advice)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 
PPC32_SYSCALL_DEFINE6(ppc_sync_file_range2,int,fd,unsigned int,flags,unsigned int,offset1,unsigned int,offset2,unsigned int,nbytes1,unsigned int,nbytes2)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
SYSCALL_DEFINE6(ppc_fallocate,int,fd,int,mode,u32,offset1,u32,offset2,u32,len1,u32,len2)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