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709 lines
17 KiB
709 lines
17 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* linux/arch/sparc64/kernel/sys_sparc.c |
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* |
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* This file contains various random system calls that |
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* have a non-standard calling sequence on the Linux/sparc |
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* platform. |
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*/ |
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|
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#include <linux/errno.h> |
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#include <linux/types.h> |
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#include <linux/sched/signal.h> |
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#include <linux/sched/mm.h> |
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#include <linux/sched/debug.h> |
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#include <linux/fs.h> |
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#include <linux/file.h> |
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#include <linux/mm.h> |
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#include <linux/sem.h> |
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#include <linux/msg.h> |
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#include <linux/shm.h> |
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#include <linux/stat.h> |
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#include <linux/mman.h> |
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#include <linux/utsname.h> |
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#include <linux/smp.h> |
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#include <linux/slab.h> |
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#include <linux/syscalls.h> |
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#include <linux/ipc.h> |
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#include <linux/personality.h> |
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#include <linux/random.h> |
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#include <linux/export.h> |
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#include <linux/context_tracking.h> |
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#include <linux/timex.h> |
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#include <linux/uaccess.h> |
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|
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#include <asm/utrap.h> |
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#include <asm/unistd.h> |
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|
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#include "entry.h" |
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#include "kernel.h" |
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#include "systbls.h" |
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|
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/* #define DEBUG_UNIMP_SYSCALL */ |
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|
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SYSCALL_DEFINE0(getpagesize) |
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{ |
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return PAGE_SIZE; |
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} |
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|
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/* Does addr --> addr+len fall within 4GB of the VA-space hole or |
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* overflow past the end of the 64-bit address space? |
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*/ |
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static inline int invalid_64bit_range(unsigned long addr, unsigned long len) |
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{ |
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unsigned long va_exclude_start, va_exclude_end; |
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va_exclude_start = VA_EXCLUDE_START; |
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va_exclude_end = VA_EXCLUDE_END; |
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if (unlikely(len >= va_exclude_start)) |
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return 1; |
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|
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if (unlikely((addr + len) < addr)) |
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return 1; |
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if (unlikely((addr >= va_exclude_start && addr < va_exclude_end) || |
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((addr + len) >= va_exclude_start && |
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(addr + len) < va_exclude_end))) |
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return 1; |
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|
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return 0; |
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} |
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|
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/* These functions differ from the default implementations in |
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* mm/mmap.c in two ways: |
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* |
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* 1) For file backed MAP_SHARED mmap()'s we D-cache color align, |
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* for fixed such mappings we just validate what the user gave us. |
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* 2) For 64-bit tasks we avoid mapping anything within 4GB of |
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* the spitfire/niagara VA-hole. |
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*/ |
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|
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static inline unsigned long COLOR_ALIGN(unsigned long addr, |
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unsigned long pgoff) |
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{ |
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unsigned long base = (addr+SHMLBA-1)&~(SHMLBA-1); |
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unsigned long off = (pgoff<<PAGE_SHIFT) & (SHMLBA-1); |
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|
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return base + off; |
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} |
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unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags) |
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{ |
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struct mm_struct *mm = current->mm; |
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struct vm_area_struct * vma; |
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unsigned long task_size = TASK_SIZE; |
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int do_color_align; |
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struct vm_unmapped_area_info info; |
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|
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if (flags & MAP_FIXED) { |
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/* We do not accept a shared mapping if it would violate |
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* cache aliasing constraints. |
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*/ |
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if ((flags & MAP_SHARED) && |
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((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1))) |
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return -EINVAL; |
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return addr; |
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} |
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if (test_thread_flag(TIF_32BIT)) |
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task_size = STACK_TOP32; |
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if (unlikely(len > task_size || len >= VA_EXCLUDE_START)) |
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return -ENOMEM; |
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do_color_align = 0; |
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if (filp || (flags & MAP_SHARED)) |
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do_color_align = 1; |
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if (addr) { |
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if (do_color_align) |
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addr = COLOR_ALIGN(addr, pgoff); |
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else |
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addr = PAGE_ALIGN(addr); |
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vma = find_vma(mm, addr); |
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if (task_size - len >= addr && |
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(!vma || addr + len <= vm_start_gap(vma))) |
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return addr; |
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} |
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info.flags = 0; |
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info.length = len; |
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info.low_limit = TASK_UNMAPPED_BASE; |
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info.high_limit = min(task_size, VA_EXCLUDE_START); |
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info.align_mask = do_color_align ? (PAGE_MASK & (SHMLBA - 1)) : 0; |
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info.align_offset = pgoff << PAGE_SHIFT; |
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addr = vm_unmapped_area(&info); |
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if ((addr & ~PAGE_MASK) && task_size > VA_EXCLUDE_END) { |
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VM_BUG_ON(addr != -ENOMEM); |
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info.low_limit = VA_EXCLUDE_END; |
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info.high_limit = task_size; |
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addr = vm_unmapped_area(&info); |
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} |
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return addr; |
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} |
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unsigned long |
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arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0, |
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const unsigned long len, const unsigned long pgoff, |
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const unsigned long flags) |
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{ |
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struct vm_area_struct *vma; |
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struct mm_struct *mm = current->mm; |
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unsigned long task_size = STACK_TOP32; |
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unsigned long addr = addr0; |
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int do_color_align; |
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struct vm_unmapped_area_info info; |
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|
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/* This should only ever run for 32-bit processes. */ |
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BUG_ON(!test_thread_flag(TIF_32BIT)); |
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if (flags & MAP_FIXED) { |
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/* We do not accept a shared mapping if it would violate |
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* cache aliasing constraints. |
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*/ |
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if ((flags & MAP_SHARED) && |
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((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1))) |
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return -EINVAL; |
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return addr; |
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} |
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if (unlikely(len > task_size)) |
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return -ENOMEM; |
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do_color_align = 0; |
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if (filp || (flags & MAP_SHARED)) |
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do_color_align = 1; |
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/* requesting a specific address */ |
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if (addr) { |
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if (do_color_align) |
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addr = COLOR_ALIGN(addr, pgoff); |
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else |
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addr = PAGE_ALIGN(addr); |
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vma = find_vma(mm, addr); |
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if (task_size - len >= addr && |
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(!vma || addr + len <= vm_start_gap(vma))) |
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return addr; |
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} |
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info.flags = VM_UNMAPPED_AREA_TOPDOWN; |
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info.length = len; |
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info.low_limit = PAGE_SIZE; |
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info.high_limit = mm->mmap_base; |
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info.align_mask = do_color_align ? (PAGE_MASK & (SHMLBA - 1)) : 0; |
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info.align_offset = pgoff << PAGE_SHIFT; |
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addr = vm_unmapped_area(&info); |
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/* |
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* A failed mmap() very likely causes application failure, |
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* so fall back to the bottom-up function here. This scenario |
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* can happen with large stack limits and large mmap() |
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* allocations. |
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*/ |
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if (addr & ~PAGE_MASK) { |
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VM_BUG_ON(addr != -ENOMEM); |
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info.flags = 0; |
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info.low_limit = TASK_UNMAPPED_BASE; |
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info.high_limit = STACK_TOP32; |
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addr = vm_unmapped_area(&info); |
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} |
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return addr; |
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} |
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/* Try to align mapping such that we align it as much as possible. */ |
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unsigned long get_fb_unmapped_area(struct file *filp, unsigned long orig_addr, unsigned long len, unsigned long pgoff, unsigned long flags) |
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{ |
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unsigned long align_goal, addr = -ENOMEM; |
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unsigned long (*get_area)(struct file *, unsigned long, |
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unsigned long, unsigned long, unsigned long); |
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get_area = current->mm->get_unmapped_area; |
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if (flags & MAP_FIXED) { |
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/* Ok, don't mess with it. */ |
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return get_area(NULL, orig_addr, len, pgoff, flags); |
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} |
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flags &= ~MAP_SHARED; |
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align_goal = PAGE_SIZE; |
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if (len >= (4UL * 1024 * 1024)) |
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align_goal = (4UL * 1024 * 1024); |
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else if (len >= (512UL * 1024)) |
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align_goal = (512UL * 1024); |
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else if (len >= (64UL * 1024)) |
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align_goal = (64UL * 1024); |
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do { |
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addr = get_area(NULL, orig_addr, len + (align_goal - PAGE_SIZE), pgoff, flags); |
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if (!(addr & ~PAGE_MASK)) { |
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addr = (addr + (align_goal - 1UL)) & ~(align_goal - 1UL); |
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break; |
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} |
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if (align_goal == (4UL * 1024 * 1024)) |
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align_goal = (512UL * 1024); |
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else if (align_goal == (512UL * 1024)) |
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align_goal = (64UL * 1024); |
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else |
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align_goal = PAGE_SIZE; |
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} while ((addr & ~PAGE_MASK) && align_goal > PAGE_SIZE); |
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|
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/* Mapping is smaller than 64K or larger areas could not |
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* be obtained. |
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*/ |
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if (addr & ~PAGE_MASK) |
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addr = get_area(NULL, orig_addr, len, pgoff, flags); |
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return addr; |
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} |
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EXPORT_SYMBOL(get_fb_unmapped_area); |
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|
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/* Essentially the same as PowerPC. */ |
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static unsigned long mmap_rnd(void) |
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{ |
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unsigned long rnd = 0UL; |
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if (current->flags & PF_RANDOMIZE) { |
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unsigned long val = get_random_long(); |
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if (test_thread_flag(TIF_32BIT)) |
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rnd = (val % (1UL << (23UL-PAGE_SHIFT))); |
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else |
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rnd = (val % (1UL << (30UL-PAGE_SHIFT))); |
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} |
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return rnd << PAGE_SHIFT; |
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} |
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void arch_pick_mmap_layout(struct mm_struct *mm, struct rlimit *rlim_stack) |
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{ |
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unsigned long random_factor = mmap_rnd(); |
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unsigned long gap; |
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/* |
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* Fall back to the standard layout if the personality |
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* bit is set, or if the expected stack growth is unlimited: |
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*/ |
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gap = rlim_stack->rlim_cur; |
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if (!test_thread_flag(TIF_32BIT) || |
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(current->personality & ADDR_COMPAT_LAYOUT) || |
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gap == RLIM_INFINITY || |
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sysctl_legacy_va_layout) { |
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mm->mmap_base = TASK_UNMAPPED_BASE + random_factor; |
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mm->get_unmapped_area = arch_get_unmapped_area; |
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} else { |
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/* We know it's 32-bit */ |
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unsigned long task_size = STACK_TOP32; |
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if (gap < 128 * 1024 * 1024) |
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gap = 128 * 1024 * 1024; |
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if (gap > (task_size / 6 * 5)) |
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gap = (task_size / 6 * 5); |
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mm->mmap_base = PAGE_ALIGN(task_size - gap - random_factor); |
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mm->get_unmapped_area = arch_get_unmapped_area_topdown; |
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} |
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} |
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/* |
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* sys_pipe() is the normal C calling standard for creating |
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* a pipe. It's not the way unix traditionally does this, though. |
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*/ |
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SYSCALL_DEFINE0(sparc_pipe) |
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{ |
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int fd[2]; |
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int error; |
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error = do_pipe_flags(fd, 0); |
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if (error) |
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goto out; |
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current_pt_regs()->u_regs[UREG_I1] = fd[1]; |
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error = fd[0]; |
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out: |
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return error; |
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} |
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/* |
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* sys_ipc() is the de-multiplexer for the SysV IPC calls.. |
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* |
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* This is really horribly ugly. |
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*/ |
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SYSCALL_DEFINE6(sparc_ipc, unsigned int, call, int, first, unsigned long, second, |
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unsigned long, third, void __user *, ptr, long, fifth) |
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{ |
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long err; |
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|
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if (!IS_ENABLED(CONFIG_SYSVIPC)) |
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return -ENOSYS; |
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/* No need for backward compatibility. We can start fresh... */ |
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if (call <= SEMTIMEDOP) { |
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switch (call) { |
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case SEMOP: |
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err = ksys_semtimedop(first, ptr, |
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(unsigned int)second, NULL); |
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goto out; |
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case SEMTIMEDOP: |
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err = ksys_semtimedop(first, ptr, (unsigned int)second, |
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(const struct __kernel_timespec __user *) |
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(unsigned long) fifth); |
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goto out; |
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case SEMGET: |
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err = ksys_semget(first, (int)second, (int)third); |
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goto out; |
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case SEMCTL: { |
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err = ksys_old_semctl(first, second, |
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(int)third | IPC_64, |
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(unsigned long) ptr); |
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goto out; |
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} |
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default: |
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err = -ENOSYS; |
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goto out; |
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} |
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} |
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if (call <= MSGCTL) { |
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switch (call) { |
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case MSGSND: |
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err = ksys_msgsnd(first, ptr, (size_t)second, |
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(int)third); |
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goto out; |
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case MSGRCV: |
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err = ksys_msgrcv(first, ptr, (size_t)second, fifth, |
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(int)third); |
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goto out; |
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case MSGGET: |
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err = ksys_msgget((key_t)first, (int)second); |
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goto out; |
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case MSGCTL: |
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err = ksys_old_msgctl(first, (int)second | IPC_64, ptr); |
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goto out; |
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default: |
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err = -ENOSYS; |
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goto out; |
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} |
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} |
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if (call <= SHMCTL) { |
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switch (call) { |
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case SHMAT: { |
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ulong raddr; |
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err = do_shmat(first, ptr, (int)second, &raddr, SHMLBA); |
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if (!err) { |
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if (put_user(raddr, |
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(ulong __user *) third)) |
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err = -EFAULT; |
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} |
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goto out; |
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} |
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case SHMDT: |
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err = ksys_shmdt(ptr); |
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goto out; |
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case SHMGET: |
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err = ksys_shmget(first, (size_t)second, (int)third); |
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goto out; |
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case SHMCTL: |
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err = ksys_old_shmctl(first, (int)second | IPC_64, ptr); |
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goto out; |
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default: |
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err = -ENOSYS; |
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goto out; |
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} |
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} else { |
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err = -ENOSYS; |
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} |
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out: |
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return err; |
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} |
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SYSCALL_DEFINE1(sparc64_personality, unsigned long, personality) |
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{ |
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long ret; |
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if (personality(current->personality) == PER_LINUX32 && |
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personality(personality) == PER_LINUX) |
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personality |= PER_LINUX32; |
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ret = sys_personality(personality); |
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if (personality(ret) == PER_LINUX32) |
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ret &= ~PER_LINUX32; |
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return ret; |
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} |
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int sparc_mmap_check(unsigned long addr, unsigned long len) |
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{ |
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if (test_thread_flag(TIF_32BIT)) { |
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if (len >= STACK_TOP32) |
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return -EINVAL; |
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|
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if (addr > STACK_TOP32 - len) |
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return -EINVAL; |
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} else { |
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if (len >= VA_EXCLUDE_START) |
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return -EINVAL; |
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|
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if (invalid_64bit_range(addr, len)) |
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return -EINVAL; |
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} |
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return 0; |
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} |
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|
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/* Linux version of mmap */ |
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SYSCALL_DEFINE6(mmap, unsigned long, addr, unsigned long, len, |
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unsigned long, prot, unsigned long, flags, unsigned long, fd, |
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unsigned long, off) |
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{ |
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unsigned long retval = -EINVAL; |
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|
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if ((off + PAGE_ALIGN(len)) < off) |
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goto out; |
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if (off & ~PAGE_MASK) |
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goto out; |
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retval = ksys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT); |
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out: |
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return retval; |
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} |
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SYSCALL_DEFINE2(64_munmap, unsigned long, addr, size_t, len) |
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{ |
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if (invalid_64bit_range(addr, len)) |
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return -EINVAL; |
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|
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return vm_munmap(addr, len); |
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} |
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SYSCALL_DEFINE5(64_mremap, unsigned long, addr, unsigned long, old_len, |
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unsigned long, new_len, unsigned long, flags, |
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unsigned long, new_addr) |
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{ |
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if (test_thread_flag(TIF_32BIT)) |
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return -EINVAL; |
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return sys_mremap(addr, old_len, new_len, flags, new_addr); |
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} |
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|
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SYSCALL_DEFINE0(nis_syscall) |
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{ |
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static int count; |
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struct pt_regs *regs = current_pt_regs(); |
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|
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/* Don't make the system unusable, if someone goes stuck */ |
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if (count++ > 5) |
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return -ENOSYS; |
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printk ("Unimplemented SPARC system call %ld\n",regs->u_regs[1]); |
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#ifdef DEBUG_UNIMP_SYSCALL |
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show_regs (regs); |
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#endif |
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|
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return -ENOSYS; |
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} |
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|
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/* #define DEBUG_SPARC_BREAKPOINT */ |
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|
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asmlinkage void sparc_breakpoint(struct pt_regs *regs) |
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{ |
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enum ctx_state prev_state = exception_enter(); |
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|
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if (test_thread_flag(TIF_32BIT)) { |
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regs->tpc &= 0xffffffff; |
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regs->tnpc &= 0xffffffff; |
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} |
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#ifdef DEBUG_SPARC_BREAKPOINT |
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printk ("TRAP: Entering kernel PC=%lx, nPC=%lx\n", regs->tpc, regs->tnpc); |
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#endif |
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force_sig_fault(SIGTRAP, TRAP_BRKPT, (void __user *)regs->tpc, 0); |
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#ifdef DEBUG_SPARC_BREAKPOINT |
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printk ("TRAP: Returning to space: PC=%lx nPC=%lx\n", regs->tpc, regs->tnpc); |
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#endif |
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exception_exit(prev_state); |
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} |
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|
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SYSCALL_DEFINE2(getdomainname, char __user *, name, int, len) |
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{ |
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int nlen, err; |
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char tmp[__NEW_UTS_LEN + 1]; |
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|
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if (len < 0) |
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return -EINVAL; |
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|
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down_read(&uts_sem); |
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|
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nlen = strlen(utsname()->domainname) + 1; |
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err = -EINVAL; |
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if (nlen > len) |
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goto out_unlock; |
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memcpy(tmp, utsname()->domainname, nlen); |
|
|
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up_read(&uts_sem); |
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|
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if (copy_to_user(name, tmp, nlen)) |
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return -EFAULT; |
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return 0; |
|
|
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out_unlock: |
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up_read(&uts_sem); |
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return err; |
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} |
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|
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SYSCALL_DEFINE1(sparc_adjtimex, struct __kernel_timex __user *, txc_p) |
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{ |
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struct __kernel_timex txc; |
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struct __kernel_old_timeval *tv = (void *)&txc.time; |
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int ret; |
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|
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/* Copy the user data space into the kernel copy |
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* structure. But bear in mind that the structures |
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* may change |
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*/ |
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if (copy_from_user(&txc, txc_p, sizeof(txc))) |
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return -EFAULT; |
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|
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/* |
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* override for sparc64 specific timeval type: tv_usec |
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* is 32 bit wide instead of 64-bit in __kernel_timex |
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*/ |
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txc.time.tv_usec = tv->tv_usec; |
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ret = do_adjtimex(&txc); |
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tv->tv_usec = txc.time.tv_usec; |
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|
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return copy_to_user(txc_p, &txc, sizeof(txc)) ? -EFAULT : ret; |
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} |
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|
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SYSCALL_DEFINE2(sparc_clock_adjtime, const clockid_t, which_clock, |
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struct __kernel_timex __user *, txc_p) |
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{ |
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struct __kernel_timex txc; |
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struct __kernel_old_timeval *tv = (void *)&txc.time; |
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int ret; |
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|
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if (!IS_ENABLED(CONFIG_POSIX_TIMERS)) { |
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pr_err_once("process %d (%s) attempted a POSIX timer syscall " |
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"while CONFIG_POSIX_TIMERS is not set\n", |
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current->pid, current->comm); |
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|
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return -ENOSYS; |
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} |
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|
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/* Copy the user data space into the kernel copy |
|
* structure. But bear in mind that the structures |
|
* may change |
|
*/ |
|
if (copy_from_user(&txc, txc_p, sizeof(txc))) |
|
return -EFAULT; |
|
|
|
/* |
|
* override for sparc64 specific timeval type: tv_usec |
|
* is 32 bit wide instead of 64-bit in __kernel_timex |
|
*/ |
|
txc.time.tv_usec = tv->tv_usec; |
|
ret = do_clock_adjtime(which_clock, &txc); |
|
tv->tv_usec = txc.time.tv_usec; |
|
|
|
return copy_to_user(txc_p, &txc, sizeof(txc)) ? -EFAULT : ret; |
|
} |
|
|
|
SYSCALL_DEFINE5(utrap_install, utrap_entry_t, type, |
|
utrap_handler_t, new_p, utrap_handler_t, new_d, |
|
utrap_handler_t __user *, old_p, |
|
utrap_handler_t __user *, old_d) |
|
{ |
|
if (type < UT_INSTRUCTION_EXCEPTION || type > UT_TRAP_INSTRUCTION_31) |
|
return -EINVAL; |
|
if (new_p == (utrap_handler_t)(long)UTH_NOCHANGE) { |
|
if (old_p) { |
|
if (!current_thread_info()->utraps) { |
|
if (put_user(NULL, old_p)) |
|
return -EFAULT; |
|
} else { |
|
if (put_user((utrap_handler_t)(current_thread_info()->utraps[type]), old_p)) |
|
return -EFAULT; |
|
} |
|
} |
|
if (old_d) { |
|
if (put_user(NULL, old_d)) |
|
return -EFAULT; |
|
} |
|
return 0; |
|
} |
|
if (!current_thread_info()->utraps) { |
|
current_thread_info()->utraps = |
|
kcalloc(UT_TRAP_INSTRUCTION_31 + 1, sizeof(long), |
|
GFP_KERNEL); |
|
if (!current_thread_info()->utraps) |
|
return -ENOMEM; |
|
current_thread_info()->utraps[0] = 1; |
|
} else { |
|
if ((utrap_handler_t)current_thread_info()->utraps[type] != new_p && |
|
current_thread_info()->utraps[0] > 1) { |
|
unsigned long *p = current_thread_info()->utraps; |
|
|
|
current_thread_info()->utraps = |
|
kmalloc_array(UT_TRAP_INSTRUCTION_31 + 1, |
|
sizeof(long), |
|
GFP_KERNEL); |
|
if (!current_thread_info()->utraps) { |
|
current_thread_info()->utraps = p; |
|
return -ENOMEM; |
|
} |
|
p[0]--; |
|
current_thread_info()->utraps[0] = 1; |
|
memcpy(current_thread_info()->utraps+1, p+1, |
|
UT_TRAP_INSTRUCTION_31*sizeof(long)); |
|
} |
|
} |
|
if (old_p) { |
|
if (put_user((utrap_handler_t)(current_thread_info()->utraps[type]), old_p)) |
|
return -EFAULT; |
|
} |
|
if (old_d) { |
|
if (put_user(NULL, old_d)) |
|
return -EFAULT; |
|
} |
|
current_thread_info()->utraps[type] = (long)new_p; |
|
|
|
return 0; |
|
} |
|
|
|
SYSCALL_DEFINE1(memory_ordering, unsigned long, model) |
|
{ |
|
struct pt_regs *regs = current_pt_regs(); |
|
if (model >= 3) |
|
return -EINVAL; |
|
regs->tstate = (regs->tstate & ~TSTATE_MM) | (model << 14); |
|
return 0; |
|
} |
|
|
|
SYSCALL_DEFINE5(rt_sigaction, int, sig, const struct sigaction __user *, act, |
|
struct sigaction __user *, oact, void __user *, restorer, |
|
size_t, sigsetsize) |
|
{ |
|
struct k_sigaction new_ka, old_ka; |
|
int ret; |
|
|
|
/* XXX: Don't preclude handling different sized sigset_t's. */ |
|
if (sigsetsize != sizeof(sigset_t)) |
|
return -EINVAL; |
|
|
|
if (act) { |
|
new_ka.ka_restorer = restorer; |
|
if (copy_from_user(&new_ka.sa, act, sizeof(*act))) |
|
return -EFAULT; |
|
} |
|
|
|
ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); |
|
|
|
if (!ret && oact) { |
|
if (copy_to_user(oact, &old_ka.sa, sizeof(*oact))) |
|
return -EFAULT; |
|
} |
|
|
|
return ret; |
|
} |
|
|
|
SYSCALL_DEFINE0(kern_features) |
|
{ |
|
return KERN_FEATURE_MIXED_MODE_STACK; |
|
}
|
|
|