diff options
Diffstat (limited to 'arch/parisc/kernel/sys_parisc.c')
| -rw-r--r-- | arch/parisc/kernel/sys_parisc.c | 388 |
1 files changed, 388 insertions, 0 deletions
diff --git a/arch/parisc/kernel/sys_parisc.c b/arch/parisc/kernel/sys_parisc.c new file mode 100644 index 000000000..376ea0d1b --- /dev/null +++ b/arch/parisc/kernel/sys_parisc.c @@ -0,0 +1,388 @@ + +/* + * PARISC specific syscalls + * + * Copyright (C) 1999-2003 Matthew Wilcox <willy at parisc-linux.org> + * Copyright (C) 2000-2003 Paul Bame <bame at parisc-linux.org> + * Copyright (C) 2001 Thomas Bogendoerfer <tsbogend at parisc-linux.org> + * Copyright (C) 1999-2014 Helge Deller <deller@gmx.de> + * + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#include <linux/uaccess.h> +#include <asm/elf.h> +#include <linux/file.h> +#include <linux/fs.h> +#include <linux/linkage.h> +#include <linux/mm.h> +#include <linux/mman.h> +#include <linux/sched/signal.h> +#include <linux/sched/mm.h> +#include <linux/shm.h> +#include <linux/syscalls.h> +#include <linux/utsname.h> +#include <linux/personality.h> +#include <linux/random.h> + +/* we construct an artificial offset for the mapping based on the physical + * address of the kernel mapping variable */ +#define GET_LAST_MMAP(filp) \ + (filp ? ((unsigned long) filp->f_mapping) >> 8 : 0UL) +#define SET_LAST_MMAP(filp, val) \ + { /* nothing */ } + +static int get_offset(unsigned int last_mmap) +{ + return (last_mmap & (SHM_COLOUR-1)) >> PAGE_SHIFT; +} + +static unsigned long shared_align_offset(unsigned int last_mmap, + unsigned long pgoff) +{ + return (get_offset(last_mmap) + pgoff) << PAGE_SHIFT; +} + +static inline unsigned long COLOR_ALIGN(unsigned long addr, + unsigned int last_mmap, unsigned long pgoff) +{ + unsigned long base = (addr+SHM_COLOUR-1) & ~(SHM_COLOUR-1); + unsigned long off = (SHM_COLOUR-1) & + (shared_align_offset(last_mmap, pgoff) << PAGE_SHIFT); + + return base + off; +} + +/* + * Top of mmap area (just below the process stack). + */ + +/* + * When called from arch_get_unmapped_area(), rlim_stack will be NULL, + * indicating that "current" should be used instead of a passed-in + * value from the exec bprm as done with arch_pick_mmap_layout(). + */ +static unsigned long mmap_upper_limit(struct rlimit *rlim_stack) +{ + unsigned long stack_base; + + /* Limit stack size - see setup_arg_pages() in fs/exec.c */ + stack_base = rlim_stack ? rlim_stack->rlim_max + : rlimit_max(RLIMIT_STACK); + if (stack_base > STACK_SIZE_MAX) + stack_base = STACK_SIZE_MAX; + + /* Add space for stack randomization. */ + stack_base += (STACK_RND_MASK << PAGE_SHIFT); + + return PAGE_ALIGN(STACK_TOP - stack_base); +} + + +unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, + unsigned long len, unsigned long pgoff, unsigned long flags) +{ + struct mm_struct *mm = current->mm; + struct vm_area_struct *vma, *prev; + unsigned long task_size = TASK_SIZE; + int do_color_align, last_mmap; + struct vm_unmapped_area_info info; + + if (len > task_size) + return -ENOMEM; + + do_color_align = 0; + if (filp || (flags & MAP_SHARED)) + do_color_align = 1; + last_mmap = GET_LAST_MMAP(filp); + + if (flags & MAP_FIXED) { + if ((flags & MAP_SHARED) && last_mmap && + (addr - shared_align_offset(last_mmap, pgoff)) + & (SHM_COLOUR - 1)) + return -EINVAL; + goto found_addr; + } + + if (addr) { + if (do_color_align && last_mmap) + addr = COLOR_ALIGN(addr, last_mmap, pgoff); + else + addr = PAGE_ALIGN(addr); + + vma = find_vma_prev(mm, addr, &prev); + if (task_size - len >= addr && + (!vma || addr + len <= vm_start_gap(vma)) && + (!prev || addr >= vm_end_gap(prev))) + goto found_addr; + } + + info.flags = 0; + info.length = len; + info.low_limit = mm->mmap_legacy_base; + info.high_limit = mmap_upper_limit(NULL); + info.align_mask = last_mmap ? (PAGE_MASK & (SHM_COLOUR - 1)) : 0; + info.align_offset = shared_align_offset(last_mmap, pgoff); + addr = vm_unmapped_area(&info); + +found_addr: + if (do_color_align && !last_mmap && !(addr & ~PAGE_MASK)) + SET_LAST_MMAP(filp, addr - (pgoff << PAGE_SHIFT)); + + return addr; +} + +unsigned long +arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0, + const unsigned long len, const unsigned long pgoff, + const unsigned long flags) +{ + struct vm_area_struct *vma, *prev; + struct mm_struct *mm = current->mm; + unsigned long addr = addr0; + int do_color_align, last_mmap; + struct vm_unmapped_area_info info; + + /* requested length too big for entire address space */ + if (len > TASK_SIZE) + return -ENOMEM; + + do_color_align = 0; + if (filp || (flags & MAP_SHARED)) + do_color_align = 1; + last_mmap = GET_LAST_MMAP(filp); + + if (flags & MAP_FIXED) { + if ((flags & MAP_SHARED) && last_mmap && + (addr - shared_align_offset(last_mmap, pgoff)) + & (SHM_COLOUR - 1)) + return -EINVAL; + goto found_addr; + } + + /* requesting a specific address */ + if (addr) { + if (do_color_align && last_mmap) + addr = COLOR_ALIGN(addr, last_mmap, pgoff); + else + addr = PAGE_ALIGN(addr); + + vma = find_vma_prev(mm, addr, &prev); + if (TASK_SIZE - len >= addr && + (!vma || addr + len <= vm_start_gap(vma)) && + (!prev || addr >= vm_end_gap(prev))) + goto found_addr; + } + + info.flags = VM_UNMAPPED_AREA_TOPDOWN; + info.length = len; + info.low_limit = PAGE_SIZE; + info.high_limit = mm->mmap_base; + info.align_mask = last_mmap ? (PAGE_MASK & (SHM_COLOUR - 1)) : 0; + info.align_offset = shared_align_offset(last_mmap, pgoff); + addr = vm_unmapped_area(&info); + if (!(addr & ~PAGE_MASK)) + goto found_addr; + VM_BUG_ON(addr != -ENOMEM); + + /* + * A failed mmap() very likely causes application failure, + * so fall back to the bottom-up function here. This scenario + * can happen with large stack limits and large mmap() + * allocations. + */ + return arch_get_unmapped_area(filp, addr0, len, pgoff, flags); + +found_addr: + if (do_color_align && !last_mmap && !(addr & ~PAGE_MASK)) + SET_LAST_MMAP(filp, addr - (pgoff << PAGE_SHIFT)); + + return addr; +} + +static int mmap_is_legacy(void) +{ + if (current->personality & ADDR_COMPAT_LAYOUT) + return 1; + + /* parisc stack always grows up - so a unlimited stack should + * not be an indicator to use the legacy memory layout. + * if (rlimit(RLIMIT_STACK) == RLIM_INFINITY) + * return 1; + */ + + return sysctl_legacy_va_layout; +} + +static unsigned long mmap_rnd(void) +{ + unsigned long rnd = 0; + + if (current->flags & PF_RANDOMIZE) + rnd = get_random_int() & MMAP_RND_MASK; + + return rnd << PAGE_SHIFT; +} + +unsigned long arch_mmap_rnd(void) +{ + return (get_random_int() & MMAP_RND_MASK) << PAGE_SHIFT; +} + +static unsigned long mmap_legacy_base(void) +{ + return TASK_UNMAPPED_BASE + mmap_rnd(); +} + +/* + * This function, called very early during the creation of a new + * process VM image, sets up which VM layout function to use: + */ +void arch_pick_mmap_layout(struct mm_struct *mm, struct rlimit *rlim_stack) +{ + mm->mmap_legacy_base = mmap_legacy_base(); + mm->mmap_base = mmap_upper_limit(rlim_stack); + + if (mmap_is_legacy()) { + mm->mmap_base = mm->mmap_legacy_base; + mm->get_unmapped_area = arch_get_unmapped_area; + } else { + mm->get_unmapped_area = arch_get_unmapped_area_topdown; + } +} + + +asmlinkage unsigned long sys_mmap2(unsigned long addr, unsigned long len, + unsigned long prot, unsigned long flags, unsigned long fd, + unsigned long pgoff) +{ + /* Make sure the shift for mmap2 is constant (12), no matter what PAGE_SIZE + we have. */ + return ksys_mmap_pgoff(addr, len, prot, flags, fd, + pgoff >> (PAGE_SHIFT - 12)); +} + +asmlinkage unsigned long sys_mmap(unsigned long addr, unsigned long len, + unsigned long prot, unsigned long flags, unsigned long fd, + unsigned long offset) +{ + if (!(offset & ~PAGE_MASK)) { + return ksys_mmap_pgoff(addr, len, prot, flags, fd, + offset >> PAGE_SHIFT); + } else { + return -EINVAL; + } +} + +/* Fucking broken ABI */ + +#ifdef CONFIG_64BIT +asmlinkage long parisc_truncate64(const char __user * path, + unsigned int high, unsigned int low) +{ + return ksys_truncate(path, (long)high << 32 | low); +} + +asmlinkage long parisc_ftruncate64(unsigned int fd, + unsigned int high, unsigned int low) +{ + return ksys_ftruncate(fd, (long)high << 32 | low); +} + +/* stubs for the benefit of the syscall_table since truncate64 and truncate + * are identical on LP64 */ +asmlinkage long sys_truncate64(const char __user * path, unsigned long length) +{ + return ksys_truncate(path, length); +} +asmlinkage long sys_ftruncate64(unsigned int fd, unsigned long length) +{ + return ksys_ftruncate(fd, length); +} +asmlinkage long sys_fcntl64(unsigned int fd, unsigned int cmd, unsigned long arg) +{ + return sys_fcntl(fd, cmd, arg); +} +#else + +asmlinkage long parisc_truncate64(const char __user * path, + unsigned int high, unsigned int low) +{ + return ksys_truncate(path, (loff_t)high << 32 | low); +} + +asmlinkage long parisc_ftruncate64(unsigned int fd, + unsigned int high, unsigned int low) +{ + return sys_ftruncate64(fd, (loff_t)high << 32 | low); +} +#endif + +asmlinkage ssize_t parisc_pread64(unsigned int fd, char __user *buf, size_t count, + unsigned int high, unsigned int low) +{ + return ksys_pread64(fd, buf, count, (loff_t)high << 32 | low); +} + +asmlinkage ssize_t parisc_pwrite64(unsigned int fd, const char __user *buf, + size_t count, unsigned int high, unsigned int low) +{ + return ksys_pwrite64(fd, buf, count, (loff_t)high << 32 | low); +} + +asmlinkage ssize_t parisc_readahead(int fd, unsigned int high, unsigned int low, + size_t count) +{ + return ksys_readahead(fd, (loff_t)high << 32 | low, count); +} + +asmlinkage long parisc_fadvise64_64(int fd, + unsigned int high_off, unsigned int low_off, + unsigned int high_len, unsigned int low_len, int advice) +{ + return ksys_fadvise64_64(fd, (loff_t)high_off << 32 | low_off, + (loff_t)high_len << 32 | low_len, advice); +} + +asmlinkage long parisc_sync_file_range(int fd, + u32 hi_off, u32 lo_off, u32 hi_nbytes, u32 lo_nbytes, + unsigned int flags) +{ + return ksys_sync_file_range(fd, (loff_t)hi_off << 32 | lo_off, + (loff_t)hi_nbytes << 32 | lo_nbytes, flags); +} + +asmlinkage long parisc_fallocate(int fd, int mode, u32 offhi, u32 offlo, + u32 lenhi, u32 lenlo) +{ + return ksys_fallocate(fd, mode, ((u64)offhi << 32) | offlo, + ((u64)lenhi << 32) | lenlo); +} + +long parisc_personality(unsigned long personality) +{ + long err; + + if (personality(current->personality) == PER_LINUX32 + && personality(personality) == PER_LINUX) + personality = (personality & ~PER_MASK) | PER_LINUX32; + + err = sys_personality(personality); + if (personality(err) == PER_LINUX32) + err = (err & ~PER_MASK) | PER_LINUX; + + return err; +} |