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/sched/mm.h> 14 #include <linux/sched/task_stack.h> 15 #include <linux/shm.h> 16 #include <linux/file.h> /* doh, must come after sched.h... */ 17 #include <linux/smp.h> 18 #include <linux/syscalls.h> 19 #include <linux/highuid.h> 20 #include <linux/hugetlb.h> 21 22 #include <asm/shmparam.h> 23 #include <linux/uaccess.h> 24 25 unsigned long 26 arch_get_unmapped_area (struct file *filp, unsigned long addr, unsigned long len, 27 unsigned long pgoff, unsigned long flags) 28 { 29 long map_shared = (flags & MAP_SHARED); 30 unsigned long align_mask = 0; 31 struct mm_struct *mm = current->mm; 32 struct vm_unmapped_area_info info; 33 34 if (len > RGN_MAP_LIMIT) 35 return -ENOMEM; 36 37 /* handle fixed mapping: prevent overlap with huge pages */ 38 if (flags & MAP_FIXED) { 39 if (is_hugepage_only_range(mm, addr, len)) 40 return -EINVAL; 41 return addr; 42 } 43 44 #ifdef CONFIG_HUGETLB_PAGE 45 if (REGION_NUMBER(addr) == RGN_HPAGE) 46 addr = 0; 47 #endif 48 if (!addr) 49 addr = TASK_UNMAPPED_BASE; 50 51 if (map_shared && (TASK_SIZE > 0xfffffffful)) 52 /* 53 * For 64-bit tasks, align shared segments to 1MB to avoid potential 54 * performance penalty due to virtual aliasing (see ASDM). For 32-bit 55 * tasks, we prefer to avoid exhausting the address space too quickly by 56 * limiting alignment to a single page. 57 */ 58 align_mask = PAGE_MASK & (SHMLBA - 1); 59 60 info.flags = 0; 61 info.length = len; 62 info.low_limit = addr; 63 info.high_limit = TASK_SIZE; 64 info.align_mask = align_mask; 65 info.align_offset = 0; 66 return vm_unmapped_area(&info); 67 } 68 69 asmlinkage long 70 ia64_getpriority (int which, int who) 71 { 72 long prio; 73 74 prio = sys_getpriority(which, who); 75 if (prio >= 0) { 76 force_successful_syscall_return(); 77 prio = 20 - prio; 78 } 79 return prio; 80 } 81 82 /* XXX obsolete, but leave it here until the old libc is gone... */ 83 asmlinkage unsigned long 84 sys_getpagesize (void) 85 { 86 return PAGE_SIZE; 87 } 88 89 asmlinkage unsigned long 90 ia64_brk (unsigned long brk) 91 { 92 unsigned long retval = sys_brk(brk); 93 force_successful_syscall_return(); 94 return retval; 95 } 96 97 /* 98 * On IA-64, we return the two file descriptors in ret0 and ret1 (r8 99 * and r9) as this is faster than doing a copy_to_user(). 100 */ 101 asmlinkage long 102 sys_ia64_pipe (void) 103 { 104 struct pt_regs *regs = task_pt_regs(current); 105 int fd[2]; 106 int retval; 107 108 retval = do_pipe_flags(fd, 0); 109 if (retval) 110 goto out; 111 retval = fd[0]; 112 regs->r9 = fd[1]; 113 out: 114 return retval; 115 } 116 117 int ia64_mmap_check(unsigned long addr, unsigned long len, 118 unsigned long flags) 119 { 120 unsigned long roff; 121 122 /* 123 * Don't permit mappings into unmapped space, the virtual page table 124 * of a region, or across a region boundary. Note: RGN_MAP_LIMIT is 125 * equal to 2^n-PAGE_SIZE (for some integer n <= 61) and len > 0. 126 */ 127 roff = REGION_OFFSET(addr); 128 if ((len > RGN_MAP_LIMIT) || (roff > (RGN_MAP_LIMIT - len))) 129 return -EINVAL; 130 return 0; 131 } 132 133 /* 134 * mmap2() is like mmap() except that the offset is expressed in units 135 * of PAGE_SIZE (instead of bytes). This allows to mmap2() (pieces 136 * of) files that are larger than the address space of the CPU. 137 */ 138 asmlinkage unsigned long 139 sys_mmap2 (unsigned long addr, unsigned long len, int prot, int flags, int fd, long pgoff) 140 { 141 addr = sys_mmap_pgoff(addr, len, prot, flags, fd, pgoff); 142 if (!IS_ERR((void *) addr)) 143 force_successful_syscall_return(); 144 return addr; 145 } 146 147 asmlinkage unsigned long 148 sys_mmap (unsigned long addr, unsigned long len, int prot, int flags, int fd, long off) 149 { 150 if (offset_in_page(off) != 0) 151 return -EINVAL; 152 153 addr = sys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT); 154 if (!IS_ERR((void *) addr)) 155 force_successful_syscall_return(); 156 return addr; 157 } 158 159 asmlinkage unsigned long 160 ia64_mremap (unsigned long addr, unsigned long old_len, unsigned long new_len, unsigned long flags, 161 unsigned long new_addr) 162 { 163 addr = sys_mremap(addr, old_len, new_len, flags, new_addr); 164 if (!IS_ERR((void *) addr)) 165 force_successful_syscall_return(); 166 return addr; 167 } 168 169 #ifndef CONFIG_PCI 170 171 asmlinkage long 172 sys_pciconfig_read (unsigned long bus, unsigned long dfn, unsigned long off, unsigned long len, 173 void *buf) 174 { 175 return -ENOSYS; 176 } 177 178 asmlinkage long 179 sys_pciconfig_write (unsigned long bus, unsigned long dfn, unsigned long off, unsigned long len, 180 void *buf) 181 { 182 return -ENOSYS; 183 } 184 185 #endif /* CONFIG_PCI */ 186