sys_ppc32.c

  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
 70PPC32_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
 78PPC32_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
 86PPC32_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
 93PPC32_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
100PPC32_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
107PPC32_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
115PPC32_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
127SYSCALL_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