1/* 2 * This file contains various system calls that have different calling 3 * conventions on different platforms. 4 * 5 * Copyright (C) 1999-2000, 2002-2003, 2005 Hewlett-Packard Co 6 * David Mosberger-Tang <davidm@hpl.hp.com> 7 */ 8#include <linux/errno.h> 9#include <linux/fs.h> 10#include <linux/mm.h> 11#include <linux/mman.h> 12#include <linux/sched.h> 13#include <linux/shm.h> 14#include <linux/file.h> /* doh, must come after sched.h... */ 15#include <linux/smp.h> 16#include <linux/syscalls.h> 17#include <linux/highuid.h> 18#include <linux/hugetlb.h> 19 20#include <asm/shmparam.h> 21#include <asm/uaccess.h> 22 23unsigned long 24arch_get_unmapped_area (struct file *filp, unsigned long addr, unsigned long len, 25 unsigned long pgoff, unsigned long flags) 26{ 27 long map_shared = (flags & MAP_SHARED); 28 unsigned long start_addr, align_mask = PAGE_SIZE - 1; 29 struct mm_struct *mm = current->mm; 30 struct vm_area_struct *vma; 31 32 if (len > RGN_MAP_LIMIT) 33 return -ENOMEM; 34 35 /* handle fixed mapping: prevent overlap with huge pages */ 36 if (flags & MAP_FIXED) { 37 if (is_hugepage_only_range(mm, addr, len)) 38 return -EINVAL; 39 return addr; 40 } 41 42#ifdef CONFIG_HUGETLB_PAGE 43 if (REGION_NUMBER(addr) == RGN_HPAGE) 44 addr = 0; 45#endif 46 if (!addr) 47 addr = mm->free_area_cache; 48 49 if (map_shared && (TASK_SIZE > 0xfffffffful)) 50 /* 51 * For 64-bit tasks, align shared segments to 1MB to avoid potential 52 * performance penalty due to virtual aliasing (see ASDM). For 32-bit 53 * tasks, we prefer to avoid exhausting the address space too quickly by 54 * limiting alignment to a single page. 55 */ 56 align_mask = SHMLBA - 1; 57 58 full_search: 59 start_addr = addr = (addr + align_mask) & ~align_mask; 60 61 for (vma = find_vma(mm, addr); ; vma = vma->vm_next) { 62 /* At this point: (!vma || addr < vma->vm_end). */ 63 if (TASK_SIZE - len < addr || RGN_MAP_LIMIT - len < REGION_OFFSET(addr)) { 64 if (start_addr != TASK_UNMAPPED_BASE) { 65 /* Start a new search --- just in case we missed some holes. */ 66 addr = TASK_UNMAPPED_BASE; 67 goto full_search; 68 } 69 return -ENOMEM; 70 } 71 if (!vma || addr + len <= vma->vm_start) { 72 /* Remember the address where we stopped this search: */ 73 mm->free_area_cache = addr + len; 74 return addr; 75 } 76 addr = (vma->vm_end + align_mask) & ~align_mask; 77 } 78} 79 80asmlinkage long 81ia64_getpriority (int which, int who) 82{ 83 long prio; 84 85 prio = sys_getpriority(which, who); 86 if (prio >= 0) { 87 force_successful_syscall_return(); 88 prio = 20 - prio; 89 } 90 return prio; 91} 92 93asmlinkage unsigned long 94sys_getpagesize (void) 95{ 96 return PAGE_SIZE; 97} 98 99asmlinkage unsigned long 100ia64_brk (unsigned long brk) 101{ 102 unsigned long retval = sys_brk(brk); 103 force_successful_syscall_return(); 104 return retval; 105} 106 107/* 108 * On IA-64, we return the two file descriptors in ret0 and ret1 (r8 109 * and r9) as this is faster than doing a copy_to_user(). 110 */ 111asmlinkage long 112sys_ia64_pipe (void) 113{ 114 struct pt_regs *regs = task_pt_regs(current); 115 int fd[2]; 116 int retval; 117 118 retval = do_pipe_flags(fd, 0); 119 if (retval) 120 goto out; 121 retval = fd[0]; 122 regs->r9 = fd[1]; 123 out: 124 return retval; 125} 126 127int ia64_mmap_check(unsigned long addr, unsigned long len, 128 unsigned long flags) 129{ 130 unsigned long roff; 131 132 /* 133 * Don't permit mappings into unmapped space, the virtual page table 134 * of a region, or across a region boundary. Note: RGN_MAP_LIMIT is 135 * equal to 2^n-PAGE_SIZE (for some integer n <= 61) and len > 0. 136 */ 137 roff = REGION_OFFSET(addr); 138 if ((len > RGN_MAP_LIMIT) || (roff > (RGN_MAP_LIMIT - len))) 139 return -EINVAL; 140 return 0; 141} 142 143/* 144 * mmap2() is like mmap() except that the offset is expressed in units 145 * of PAGE_SIZE (instead of bytes). This allows to mmap2() (pieces 146 * of) files that are larger than the address space of the CPU. 147 */ 148asmlinkage unsigned long 149sys_mmap2 (unsigned long addr, unsigned long len, int prot, int flags, int fd, long pgoff) 150{ 151 addr = sys_mmap_pgoff(addr, len, prot, flags, fd, pgoff); 152 if (!IS_ERR((void *) addr)) 153 force_successful_syscall_return(); 154 return addr; 155} 156 157asmlinkage unsigned long 158sys_mmap (unsigned long addr, unsigned long len, int prot, int flags, int fd, long off) 159{ 160 if (offset_in_page(off) != 0) 161 return -EINVAL; 162 163 addr = sys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT); 164 if (!IS_ERR((void *) addr)) 165 force_successful_syscall_return(); 166 return addr; 167} 168 169asmlinkage unsigned long 170ia64_mremap (unsigned long addr, unsigned long old_len, unsigned long new_len, unsigned long flags, 171 unsigned long new_addr) 172{ 173 extern unsigned long do_mremap (unsigned long addr, 174 unsigned long old_len, 175 unsigned long new_len, 176 unsigned long flags, 177 unsigned long new_addr); 178 179 down_write(¤t->mm->mmap_sem); 180 { 181 addr = do_mremap(addr, old_len, new_len, flags, new_addr); 182 } 183 up_write(¤t->mm->mmap_sem); 184 185 if (IS_ERR((void *) addr)) 186 return addr; 187 188 force_successful_syscall_return(); 189 return addr; 190} 191 192#ifndef CONFIG_PCI 193 194asmlinkage long 195sys_pciconfig_read (unsigned long bus, unsigned long dfn, unsigned long off, unsigned long len, 196 void *buf) 197{ 198 return -ENOSYS; 199} 200 201asmlinkage long 202sys_pciconfig_write (unsigned long bus, unsigned long dfn, unsigned long off, unsigned long len, 203 void *buf) 204{ 205 return -ENOSYS; 206} 207 208#endif /* CONFIG_PCI */ 209