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168 lines
4.2 KiB
168 lines
4.2 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* This file contains various system calls that have different calling |
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* conventions on different platforms. |
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* |
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* Copyright (C) 1999-2000, 2002-2003, 2005 Hewlett-Packard Co |
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* David Mosberger-Tang <[email protected]> |
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*/ |
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#include <linux/errno.h> |
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#include <linux/fs.h> |
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#include <linux/mm.h> |
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#include <linux/mman.h> |
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#include <linux/sched.h> |
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#include <linux/sched/mm.h> |
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#include <linux/sched/task_stack.h> |
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#include <linux/shm.h> |
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#include <linux/file.h> /* doh, must come after sched.h... */ |
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#include <linux/smp.h> |
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#include <linux/syscalls.h> |
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#include <linux/highuid.h> |
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#include <linux/hugetlb.h> |
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#include <asm/shmparam.h> |
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#include <linux/uaccess.h> |
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unsigned long |
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arch_get_unmapped_area (struct file *filp, unsigned long addr, unsigned long len, |
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unsigned long pgoff, unsigned long flags) |
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{ |
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long map_shared = (flags & MAP_SHARED); |
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unsigned long align_mask = 0; |
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struct mm_struct *mm = current->mm; |
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struct vm_unmapped_area_info info; |
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if (len > RGN_MAP_LIMIT) |
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return -ENOMEM; |
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/* handle fixed mapping: prevent overlap with huge pages */ |
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if (flags & MAP_FIXED) { |
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if (is_hugepage_only_range(mm, addr, len)) |
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return -EINVAL; |
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return addr; |
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} |
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#ifdef CONFIG_HUGETLB_PAGE |
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if (REGION_NUMBER(addr) == RGN_HPAGE) |
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addr = 0; |
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#endif |
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if (!addr) |
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addr = TASK_UNMAPPED_BASE; |
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if (map_shared && (TASK_SIZE > 0xfffffffful)) |
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/* |
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* For 64-bit tasks, align shared segments to 1MB to avoid potential |
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* performance penalty due to virtual aliasing (see ASDM). For 32-bit |
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* tasks, we prefer to avoid exhausting the address space too quickly by |
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* limiting alignment to a single page. |
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*/ |
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align_mask = PAGE_MASK & (SHMLBA - 1); |
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info.flags = 0; |
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info.length = len; |
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info.low_limit = addr; |
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info.high_limit = TASK_SIZE; |
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info.align_mask = align_mask; |
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info.align_offset = 0; |
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return vm_unmapped_area(&info); |
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} |
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asmlinkage long |
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ia64_getpriority (int which, int who) |
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{ |
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long prio; |
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prio = sys_getpriority(which, who); |
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if (prio >= 0) { |
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force_successful_syscall_return(); |
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prio = 20 - prio; |
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} |
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return prio; |
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} |
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/* XXX obsolete, but leave it here until the old libc is gone... */ |
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asmlinkage unsigned long |
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sys_getpagesize (void) |
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{ |
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return PAGE_SIZE; |
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} |
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asmlinkage unsigned long |
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ia64_brk (unsigned long brk) |
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{ |
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unsigned long retval = sys_brk(brk); |
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force_successful_syscall_return(); |
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return retval; |
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} |
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/* |
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* On IA-64, we return the two file descriptors in ret0 and ret1 (r8 |
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* and r9) as this is faster than doing a copy_to_user(). |
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*/ |
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asmlinkage long |
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sys_ia64_pipe (void) |
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{ |
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struct pt_regs *regs = task_pt_regs(current); |
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int fd[2]; |
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int retval; |
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retval = do_pipe_flags(fd, 0); |
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if (retval) |
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goto out; |
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retval = fd[0]; |
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regs->r9 = fd[1]; |
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out: |
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return retval; |
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} |
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int ia64_mmap_check(unsigned long addr, unsigned long len, |
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unsigned long flags) |
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{ |
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unsigned long roff; |
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/* |
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* Don't permit mappings into unmapped space, the virtual page table |
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* of a region, or across a region boundary. Note: RGN_MAP_LIMIT is |
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* equal to 2^n-PAGE_SIZE (for some integer n <= 61) and len > 0. |
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*/ |
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roff = REGION_OFFSET(addr); |
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if ((len > RGN_MAP_LIMIT) || (roff > (RGN_MAP_LIMIT - len))) |
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return -EINVAL; |
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return 0; |
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} |
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/* |
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* mmap2() is like mmap() except that the offset is expressed in units |
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* of PAGE_SIZE (instead of bytes). This allows to mmap2() (pieces |
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* of) files that are larger than the address space of the CPU. |
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*/ |
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asmlinkage unsigned long |
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sys_mmap2 (unsigned long addr, unsigned long len, int prot, int flags, int fd, long pgoff) |
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{ |
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addr = ksys_mmap_pgoff(addr, len, prot, flags, fd, pgoff); |
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if (!IS_ERR((void *) addr)) |
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force_successful_syscall_return(); |
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return addr; |
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} |
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asmlinkage unsigned long |
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sys_mmap (unsigned long addr, unsigned long len, int prot, int flags, int fd, long off) |
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{ |
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if (offset_in_page(off) != 0) |
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return -EINVAL; |
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addr = ksys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT); |
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if (!IS_ERR((void *) addr)) |
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force_successful_syscall_return(); |
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return addr; |
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} |
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asmlinkage unsigned long |
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ia64_mremap (unsigned long addr, unsigned long old_len, unsigned long new_len, unsigned long flags, |
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unsigned long new_addr) |
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{ |
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addr = sys_mremap(addr, old_len, new_len, flags, new_addr); |
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if (!IS_ERR((void *) addr)) |
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force_successful_syscall_return(); |
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return addr; |
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}
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