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 align_mask = 0; 29 struct mm_struct *mm = current->mm; 30 struct vm_unmapped_area_info info; 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 = TASK_UNMAPPED_BASE; 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 = PAGE_MASK & (SHMLBA - 1); 57 58 info.flags = 0; 59 info.length = len; 60 info.low_limit = addr; 61 info.high_limit = TASK_SIZE; 62 info.align_mask = align_mask; 63 info.align_offset = 0; 64 return vm_unmapped_area(&info); 65 } 66 67 asmlinkage long 68 ia64_getpriority (int which, int who) 69 { 70 long prio; 71 72 prio = sys_getpriority(which, who); 73 if (prio >= 0) { 74 force_successful_syscall_return(); 75 prio = 20 - prio; 76 } 77 return prio; 78 } 79 80 /* XXX obsolete, but leave it here until the old libc is gone... */ 81 asmlinkage unsigned long 82 sys_getpagesize (void) 83 { 84 return PAGE_SIZE; 85 } 86 87 asmlinkage unsigned long 88 ia64_brk (unsigned long brk) 89 { 90 unsigned long retval = sys_brk(brk); 91 force_successful_syscall_return(); 92 return retval; 93 } 94 95 /* 96 * On IA-64, we return the two file descriptors in ret0 and ret1 (r8 97 * and r9) as this is faster than doing a copy_to_user(). 98 */ 99 asmlinkage long 100 sys_ia64_pipe (void) 101 { 102 struct pt_regs *regs = task_pt_regs(current); 103 int fd[2]; 104 int retval; 105 106 retval = do_pipe_flags(fd, 0); 107 if (retval) 108 goto out; 109 retval = fd[0]; 110 regs->r9 = fd[1]; 111 out: 112 return retval; 113 } 114 115 int ia64_mmap_check(unsigned long addr, unsigned long len, 116 unsigned long flags) 117 { 118 unsigned long roff; 119 120 /* 121 * Don't permit mappings into unmapped space, the virtual page table 122 * of a region, or across a region boundary. Note: RGN_MAP_LIMIT is 123 * equal to 2^n-PAGE_SIZE (for some integer n <= 61) and len > 0. 124 */ 125 roff = REGION_OFFSET(addr); 126 if ((len > RGN_MAP_LIMIT) || (roff > (RGN_MAP_LIMIT - len))) 127 return -EINVAL; 128 return 0; 129 } 130 131 /* 132 * mmap2() is like mmap() except that the offset is expressed in units 133 * of PAGE_SIZE (instead of bytes). This allows to mmap2() (pieces 134 * of) files that are larger than the address space of the CPU. 135 */ 136 asmlinkage unsigned long 137 sys_mmap2 (unsigned long addr, unsigned long len, int prot, int flags, int fd, long pgoff) 138 { 139 addr = sys_mmap_pgoff(addr, len, prot, flags, fd, pgoff); 140 if (!IS_ERR((void *) addr)) 141 force_successful_syscall_return(); 142 return addr; 143 } 144 145 asmlinkage unsigned long 146 sys_mmap (unsigned long addr, unsigned long len, int prot, int flags, int fd, long off) 147 { 148 if (offset_in_page(off) != 0) 149 return -EINVAL; 150 151 addr = sys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT); 152 if (!IS_ERR((void *) addr)) 153 force_successful_syscall_return(); 154 return addr; 155 } 156 157 asmlinkage unsigned long 158 ia64_mremap (unsigned long addr, unsigned long old_len, unsigned long new_len, unsigned long flags, 159 unsigned long new_addr) 160 { 161 addr = sys_mremap(addr, old_len, new_len, flags, new_addr); 162 if (!IS_ERR((void *) addr)) 163 force_successful_syscall_return(); 164 return addr; 165 } 166 167 #ifndef CONFIG_PCI 168 169 asmlinkage long 170 sys_pciconfig_read (unsigned long bus, unsigned long dfn, unsigned long off, unsigned long len, 171 void *buf) 172 { 173 return -ENOSYS; 174 } 175 176 asmlinkage long 177 sys_pciconfig_write (unsigned long bus, unsigned long dfn, unsigned long off, unsigned long len, 178 void *buf) 179 { 180 return -ENOSYS; 181 } 182 183 #endif /* CONFIG_PCI */ 184