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/arch/mips/kernel/linux32.c

http://github.com/mirrors/linux
C | 133 lines | 108 code | 15 blank | 10 comment | 7 complexity | e226230401bdd819a7e555237e3744d6 MD5 | raw file
  1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 * Conversion between 32-bit and 64-bit native system calls.
  4 *
  5 * Copyright (C) 2000 Silicon Graphics, Inc.
  6 * Written by Ulf Carlsson (ulfc@engr.sgi.com)
  7 */
  8#include <linux/compiler.h>
  9#include <linux/mm.h>
 10#include <linux/errno.h>
 11#include <linux/file.h>
 12#include <linux/highuid.h>
 13#include <linux/resource.h>
 14#include <linux/highmem.h>
 15#include <linux/time.h>
 16#include <linux/times.h>
 17#include <linux/poll.h>
 18#include <linux/skbuff.h>
 19#include <linux/filter.h>
 20#include <linux/shm.h>
 21#include <linux/sem.h>
 22#include <linux/msg.h>
 23#include <linux/icmpv6.h>
 24#include <linux/syscalls.h>
 25#include <linux/sysctl.h>
 26#include <linux/utime.h>
 27#include <linux/utsname.h>
 28#include <linux/personality.h>
 29#include <linux/dnotify.h>
 30#include <linux/binfmts.h>
 31#include <linux/security.h>
 32#include <linux/compat.h>
 33#include <linux/vfs.h>
 34#include <linux/ipc.h>
 35#include <linux/slab.h>
 36
 37#include <net/sock.h>
 38#include <net/scm.h>
 39
 40#include <asm/compat-signal.h>
 41#include <asm/sim.h>
 42#include <linux/uaccess.h>
 43#include <asm/mmu_context.h>
 44#include <asm/mman.h>
 45
 46#ifdef __MIPSEB__
 47#define merge_64(r1, r2) ((((r1) & 0xffffffffUL) << 32) + ((r2) & 0xffffffffUL))
 48#endif
 49#ifdef __MIPSEL__
 50#define merge_64(r1, r2) ((((r2) & 0xffffffffUL) << 32) + ((r1) & 0xffffffffUL))
 51#endif
 52
 53SYSCALL_DEFINE4(32_truncate64, const char __user *, path,
 54	unsigned long, __dummy, unsigned long, a2, unsigned long, a3)
 55{
 56	return ksys_truncate(path, merge_64(a2, a3));
 57}
 58
 59SYSCALL_DEFINE4(32_ftruncate64, unsigned long, fd, unsigned long, __dummy,
 60	unsigned long, a2, unsigned long, a3)
 61{
 62	return ksys_ftruncate(fd, merge_64(a2, a3));
 63}
 64
 65SYSCALL_DEFINE5(32_llseek, unsigned int, fd, unsigned int, offset_high,
 66		unsigned int, offset_low, loff_t __user *, result,
 67		unsigned int, origin)
 68{
 69	return sys_llseek(fd, offset_high, offset_low, result, origin);
 70}
 71
 72/* From the Single Unix Spec: pread & pwrite act like lseek to pos + op +
 73   lseek back to original location.  They fail just like lseek does on
 74   non-seekable files.	*/
 75
 76SYSCALL_DEFINE6(32_pread, unsigned long, fd, char __user *, buf, size_t, count,
 77	unsigned long, unused, unsigned long, a4, unsigned long, a5)
 78{
 79	return ksys_pread64(fd, buf, count, merge_64(a4, a5));
 80}
 81
 82SYSCALL_DEFINE6(32_pwrite, unsigned int, fd, const char __user *, buf,
 83	size_t, count, u32, unused, u64, a4, u64, a5)
 84{
 85	return ksys_pwrite64(fd, buf, count, merge_64(a4, a5));
 86}
 87
 88SYSCALL_DEFINE1(32_personality, unsigned long, personality)
 89{
 90	unsigned int p = personality & 0xffffffff;
 91	int ret;
 92
 93	if (personality(current->personality) == PER_LINUX32 &&
 94	    personality(p) == PER_LINUX)
 95		p = (p & ~PER_MASK) | PER_LINUX32;
 96	ret = sys_personality(p);
 97	if (ret != -1 && personality(ret) == PER_LINUX32)
 98		ret = (ret & ~PER_MASK) | PER_LINUX;
 99	return ret;
100}
101
102asmlinkage ssize_t sys32_readahead(int fd, u32 pad0, u64 a2, u64 a3,
103				   size_t count)
104{
105	return ksys_readahead(fd, merge_64(a2, a3), count);
106}
107
108asmlinkage long sys32_sync_file_range(int fd, int __pad,
109	unsigned long a2, unsigned long a3,
110	unsigned long a4, unsigned long a5,
111	int flags)
112{
113	return ksys_sync_file_range(fd,
114			merge_64(a2, a3), merge_64(a4, a5),
115			flags);
116}
117
118asmlinkage long sys32_fadvise64_64(int fd, int __pad,
119	unsigned long a2, unsigned long a3,
120	unsigned long a4, unsigned long a5,
121	int flags)
122{
123	return ksys_fadvise64_64(fd,
124			merge_64(a2, a3), merge_64(a4, a5),
125			flags);
126}
127
128asmlinkage long sys32_fallocate(int fd, int mode, unsigned offset_a2,
129	unsigned offset_a3, unsigned len_a4, unsigned len_a5)
130{
131	return ksys_fallocate(fd, mode, merge_64(offset_a2, offset_a3),
132			      merge_64(len_a4, len_a5));
133}