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 23 unsigned long 24 arch_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 80 asmlinkage long 81 ia64_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 93 /* XXX obsolete, but leave it here until the old libc is gone... */ 94 asmlinkage unsigned long 95 sys_getpagesize (void) 96 { 97 return PAGE_SIZE; 98 } 99 100 asmlinkage unsigned long 101 ia64_brk (unsigned long brk) 102 { 103 unsigned long retval = sys_brk(brk); 104 force_successful_syscall_return(); 105 return retval; 106 } 107 108 /* 109 * On IA-64, we return the two file descriptors in ret0 and ret1 (r8 110 * and r9) as this is faster than doing a copy_to_user(). 111 */ 112 asmlinkage long 113 sys_ia64_pipe (void) 114 { 115 struct pt_regs *regs = task_pt_regs(current); 116 int fd[2]; 117 int retval; 118 119 retval = do_pipe_flags(fd, 0); 120 if (retval) 121 goto out; 122 retval = fd[0]; 123 regs->r9 = fd[1]; 124 out: 125 return retval; 126 } 127 128 int ia64_mmap_check(unsigned long addr, unsigned long len, 129 unsigned long flags) 130 { 131 unsigned long roff; 132 133 /* 134 * Don't permit mappings into unmapped space, the virtual page table 135 * of a region, or across a region boundary. Note: RGN_MAP_LIMIT is 136 * equal to 2^n-PAGE_SIZE (for some integer n <= 61) and len > 0. 137 */ 138 roff = REGION_OFFSET(addr); 139 if ((len > RGN_MAP_LIMIT) || (roff > (RGN_MAP_LIMIT - len))) 140 return -EINVAL; 141 return 0; 142 } 143 144 /* 145 * mmap2() is like mmap() except that the offset is expressed in units 146 * of PAGE_SIZE (instead of bytes). This allows to mmap2() (pieces 147 * of) files that are larger than the address space of the CPU. 148 */ 149 asmlinkage unsigned long 150 sys_mmap2 (unsigned long addr, unsigned long len, int prot, int flags, int fd, long pgoff) 151 { 152 addr = sys_mmap_pgoff(addr, len, prot, flags, fd, pgoff); 153 if (!IS_ERR((void *) addr)) 154 force_successful_syscall_return(); 155 return addr; 156 } 157 158 asmlinkage unsigned long 159 sys_mmap (unsigned long addr, unsigned long len, int prot, int flags, int fd, long off) 160 { 161 if (offset_in_page(off) != 0) 162 return -EINVAL; 163 164 addr = sys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT); 165 if (!IS_ERR((void *) addr)) 166 force_successful_syscall_return(); 167 return addr; 168 } 169 170 asmlinkage unsigned long 171 ia64_mremap (unsigned long addr, unsigned long old_len, unsigned long new_len, unsigned long flags, 172 unsigned long new_addr) 173 { 174 addr = sys_mremap(addr, old_len, new_len, flags, new_addr); 175 if (!IS_ERR((void *) addr)) 176 force_successful_syscall_return(); 177 return addr; 178 } 179 180 #ifndef CONFIG_PCI 181 182 asmlinkage long 183 sys_pciconfig_read (unsigned long bus, unsigned long dfn, unsigned long off, unsigned long len, 184 void *buf) 185 { 186 return -ENOSYS; 187 } 188 189 asmlinkage long 190 sys_pciconfig_write (unsigned long bus, unsigned long dfn, unsigned long off, unsigned long len, 191 void *buf) 192 { 193 return -ENOSYS; 194 } 195 196 #endif /* CONFIG_PCI */ 197