1/* 2 * Implementation of various system calls for Linux/PowerPC 3 * 4 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) 5 * 6 * Derived from "arch/i386/kernel/sys_i386.c" 7 * Adapted from the i386 version by Gary Thomas 8 * Modified by Cort Dougan (cort@cs.nmt.edu) 9 * and Paul Mackerras (paulus@cs.anu.edu.au). 10 * 11 * This file contains various random system calls that 12 * have a non-standard calling sequence on the Linux/PPC 13 * platform. 14 * 15 * This program is free software; you can redistribute it and/or 16 * modify it under the terms of the GNU General Public License 17 * as published by the Free Software Foundation; either version 18 * 2 of the License, or (at your option) any later version. 19 * 20 */ 21 22#include <linux/errno.h> 23#include <linux/sched.h> 24#include <linux/syscalls.h> 25#include <linux/mm.h> 26#include <linux/fs.h> 27#include <linux/smp.h> 28#include <linux/sem.h> 29#include <linux/msg.h> 30#include <linux/shm.h> 31#include <linux/stat.h> 32#include <linux/mman.h> 33#include <linux/sys.h> 34#include <linux/ipc.h> 35#include <linux/utsname.h> 36#include <linux/file.h> 37#include <linux/init.h> 38#include <linux/personality.h> 39 40#include <asm/uaccess.h> 41#include <asm/syscalls.h> 42#include <asm/time.h> 43#include <asm/unistd.h> 44 45static inline unsigned long do_mmap2(unsigned long addr, size_t len, 46 unsigned long prot, unsigned long flags, 47 unsigned long fd, unsigned long off, int shift) 48{ 49 unsigned long ret = -EINVAL; 50 51 if (!arch_validate_prot(prot)) 52 goto out; 53 54 if (shift) { 55 if (off & ((1 << shift) - 1)) 56 goto out; 57 off >>= shift; 58 } 59 60 ret = sys_mmap_pgoff(addr, len, prot, flags, fd, off); 61out: 62 return ret; 63} 64 65unsigned long sys_mmap2(unsigned long addr, size_t len, 66 unsigned long prot, unsigned long flags, 67 unsigned long fd, unsigned long pgoff) 68{ 69 return do_mmap2(addr, len, prot, flags, fd, pgoff, PAGE_SHIFT-12); 70} 71 72unsigned long sys_mmap(unsigned long addr, size_t len, 73 unsigned long prot, unsigned long flags, 74 unsigned long fd, off_t offset) 75{ 76 return do_mmap2(addr, len, prot, flags, fd, offset, PAGE_SHIFT); 77} 78 79#ifdef CONFIG_PPC32 80/* 81 * Due to some executables calling the wrong select we sometimes 82 * get wrong args. This determines how the args are being passed 83 * (a single ptr to them all args passed) then calls 84 * sys_select() with the appropriate args. -- Cort 85 */ 86int 87ppc_select(int n, fd_set __user *inp, fd_set __user *outp, fd_set __user *exp, struct timeval __user *tvp) 88{ 89 if ( (unsigned long)n >= 4096 ) 90 { 91 unsigned long __user *buffer = (unsigned long __user *)n; 92 if (!access_ok(VERIFY_READ, buffer, 5*sizeof(unsigned long)) 93 || __get_user(n, buffer) 94 || __get_user(inp, ((fd_set __user * __user *)(buffer+1))) 95 || __get_user(outp, ((fd_set __user * __user *)(buffer+2))) 96 || __get_user(exp, ((fd_set __user * __user *)(buffer+3))) 97 || __get_user(tvp, ((struct timeval __user * __user *)(buffer+4)))) 98 return -EFAULT; 99 } 100 return sys_select(n, inp, outp, exp, tvp); 101} 102#endif 103 104#ifdef CONFIG_PPC64 105long ppc64_personality(unsigned long personality) 106{ 107 long ret; 108 109 if (personality(current->personality) == PER_LINUX32 110 && personality == PER_LINUX) 111 personality = PER_LINUX32; 112 ret = sys_personality(personality); 113 if (ret == PER_LINUX32) 114 ret = PER_LINUX; 115 return ret; 116} 117#endif 118 119long ppc_fadvise64_64(int fd, int advice, u32 offset_high, u32 offset_low, 120 u32 len_high, u32 len_low) 121{ 122 return sys_fadvise64(fd, (u64)offset_high << 32 | offset_low, 123 (u64)len_high << 32 | len_low, advice); 124} 125 126void do_show_syscall(unsigned long r3, unsigned long r4, unsigned long r5, 127 unsigned long r6, unsigned long r7, unsigned long r8, 128 struct pt_regs *regs) 129{ 130 printk("syscall %ld(%lx, %lx, %lx, %lx, %lx, %lx) regs=%p current=%p" 131 " cpu=%d\n", regs->gpr[0], r3, r4, r5, r6, r7, r8, regs, 132 current, smp_processor_id()); 133} 134 135void do_show_syscall_exit(unsigned long r3) 136{ 137 printk(" -> %lx, current=%p cpu=%d\n", r3, current, smp_processor_id()); 138} 139