1 // SPDX-License-Identifier: GPL-2.0-or-later
4 * PARISC specific syscalls
6 * Copyright (C) 1999-2003 Matthew Wilcox <willy at parisc-linux.org>
7 * Copyright (C) 2000-2003 Paul Bame <bame at parisc-linux.org>
8 * Copyright (C) 2001 Thomas Bogendoerfer <tsbogend at parisc-linux.org>
9 * Copyright (C) 1999-2020 Helge Deller <deller@gmx.de>
12 #include <linux/uaccess.h>
14 #include <linux/file.h>
16 #include <linux/linkage.h>
18 #include <linux/mman.h>
19 #include <linux/sched/signal.h>
20 #include <linux/sched/mm.h>
21 #include <linux/shm.h>
22 #include <linux/syscalls.h>
23 #include <linux/utsname.h>
24 #include <linux/personality.h>
25 #include <linux/random.h>
26 #include <linux/compat.h>
27 #include <linux/elf-randomize.h>
30 * Construct an artificial page offset for the mapping based on the physical
31 * address of the kernel file mapping variable.
33 #define GET_FILP_PGOFF(filp) \
34 (filp ? (((unsigned long) filp->f_mapping) >> 8) \
35 & ((SHM_COLOUR-1) >> PAGE_SHIFT) : 0UL)
37 static unsigned long shared_align_offset(unsigned long filp_pgoff,
40 return (filp_pgoff + pgoff) << PAGE_SHIFT;
43 static inline unsigned long COLOR_ALIGN(unsigned long addr,
44 unsigned long filp_pgoff, unsigned long pgoff)
46 unsigned long base = (addr+SHM_COLOUR-1) & ~(SHM_COLOUR-1);
47 unsigned long off = (SHM_COLOUR-1) &
48 shared_align_offset(filp_pgoff, pgoff);
53 #define STACK_SIZE_DEFAULT (USER_WIDE_MODE \
54 ? (1 << 30) /* 1 GB */ \
55 : (CONFIG_STACK_MAX_DEFAULT_SIZE_MB*1024*1024))
57 unsigned long calc_max_stack_size(unsigned long stack_max)
60 if (!USER_WIDE_MODE && (stack_max == COMPAT_RLIM_INFINITY))
61 stack_max = STACK_SIZE_DEFAULT;
64 if (stack_max == RLIM_INFINITY)
65 stack_max = STACK_SIZE_DEFAULT;
72 * Top of mmap area (just below the process stack).
76 * When called from arch_get_unmapped_area(), rlim_stack will be NULL,
77 * indicating that "current" should be used instead of a passed-in
78 * value from the exec bprm as done with arch_pick_mmap_layout().
80 static unsigned long mmap_upper_limit(struct rlimit *rlim_stack)
82 unsigned long stack_base;
84 /* Limit stack size - see setup_arg_pages() in fs/exec.c */
85 stack_base = rlim_stack ? rlim_stack->rlim_max
86 : rlimit_max(RLIMIT_STACK);
88 stack_base = calc_max_stack_size(stack_base);
90 /* Add space for stack randomization. */
91 if (current->flags & PF_RANDOMIZE)
92 stack_base += (STACK_RND_MASK << PAGE_SHIFT);
94 return PAGE_ALIGN(STACK_TOP - stack_base);
97 enum mmap_allocation_direction {UP, DOWN};
99 static unsigned long arch_get_unmapped_area_common(struct file *filp,
100 unsigned long addr, unsigned long len, unsigned long pgoff,
101 unsigned long flags, enum mmap_allocation_direction dir)
103 struct mm_struct *mm = current->mm;
104 struct vm_area_struct *vma, *prev;
105 unsigned long filp_pgoff;
107 struct vm_unmapped_area_info info;
109 if (unlikely(len > TASK_SIZE))
113 if (filp || (flags & MAP_SHARED))
115 filp_pgoff = GET_FILP_PGOFF(filp);
117 if (flags & MAP_FIXED) {
118 /* Even MAP_FIXED mappings must reside within TASK_SIZE */
119 if (TASK_SIZE - len < addr)
122 if ((flags & MAP_SHARED) && filp &&
123 (addr - shared_align_offset(filp_pgoff, pgoff))
131 addr = COLOR_ALIGN(addr, filp_pgoff, pgoff);
133 addr = PAGE_ALIGN(addr);
135 vma = find_vma_prev(mm, addr, &prev);
136 if (TASK_SIZE - len >= addr &&
137 (!vma || addr + len <= vm_start_gap(vma)) &&
138 (!prev || addr >= vm_end_gap(prev)))
143 info.align_mask = do_color_align ? (PAGE_MASK & (SHM_COLOUR - 1)) : 0;
144 info.align_offset = shared_align_offset(filp_pgoff, pgoff);
147 info.flags = VM_UNMAPPED_AREA_TOPDOWN;
148 info.low_limit = PAGE_SIZE;
149 info.high_limit = mm->mmap_base;
150 addr = vm_unmapped_area(&info);
151 if (!(addr & ~PAGE_MASK))
153 VM_BUG_ON(addr != -ENOMEM);
156 * A failed mmap() very likely causes application failure,
157 * so fall back to the bottom-up function here. This scenario
158 * can happen with large stack limits and large mmap()
164 info.low_limit = mm->mmap_legacy_base;
165 info.high_limit = mmap_upper_limit(NULL);
166 return vm_unmapped_area(&info);
169 unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr,
170 unsigned long len, unsigned long pgoff, unsigned long flags)
172 return arch_get_unmapped_area_common(filp,
173 addr, len, pgoff, flags, UP);
176 unsigned long arch_get_unmapped_area_topdown(struct file *filp,
177 unsigned long addr, unsigned long len, unsigned long pgoff,
180 return arch_get_unmapped_area_common(filp,
181 addr, len, pgoff, flags, DOWN);
184 static int mmap_is_legacy(void)
186 if (current->personality & ADDR_COMPAT_LAYOUT)
189 /* parisc stack always grows up - so a unlimited stack should
190 * not be an indicator to use the legacy memory layout.
191 * if (rlimit(RLIMIT_STACK) == RLIM_INFINITY)
195 return sysctl_legacy_va_layout;
198 static unsigned long mmap_rnd(void)
200 unsigned long rnd = 0;
202 if (current->flags & PF_RANDOMIZE)
203 rnd = get_random_u32() & MMAP_RND_MASK;
205 return rnd << PAGE_SHIFT;
208 unsigned long arch_mmap_rnd(void)
210 return (get_random_u32() & MMAP_RND_MASK) << PAGE_SHIFT;
213 static unsigned long mmap_legacy_base(void)
215 return TASK_UNMAPPED_BASE + mmap_rnd();
219 * This function, called very early during the creation of a new
220 * process VM image, sets up which VM layout function to use:
222 void arch_pick_mmap_layout(struct mm_struct *mm, struct rlimit *rlim_stack)
224 mm->mmap_legacy_base = mmap_legacy_base();
225 mm->mmap_base = mmap_upper_limit(rlim_stack);
227 if (mmap_is_legacy()) {
228 mm->mmap_base = mm->mmap_legacy_base;
229 mm->get_unmapped_area = arch_get_unmapped_area;
231 mm->get_unmapped_area = arch_get_unmapped_area_topdown;
236 asmlinkage unsigned long sys_mmap2(unsigned long addr, unsigned long len,
237 unsigned long prot, unsigned long flags, unsigned long fd,
240 /* Make sure the shift for mmap2 is constant (12), no matter what PAGE_SIZE
242 return ksys_mmap_pgoff(addr, len, prot, flags, fd,
243 pgoff >> (PAGE_SHIFT - 12));
246 asmlinkage unsigned long sys_mmap(unsigned long addr, unsigned long len,
247 unsigned long prot, unsigned long flags, unsigned long fd,
248 unsigned long offset)
250 if (!(offset & ~PAGE_MASK)) {
251 return ksys_mmap_pgoff(addr, len, prot, flags, fd,
252 offset >> PAGE_SHIFT);
258 /* Fucking broken ABI */
261 asmlinkage long parisc_truncate64(const char __user * path,
262 unsigned int high, unsigned int low)
264 return ksys_truncate(path, (long)high << 32 | low);
267 asmlinkage long parisc_ftruncate64(unsigned int fd,
268 unsigned int high, unsigned int low)
270 return ksys_ftruncate(fd, (long)high << 32 | low);
273 /* stubs for the benefit of the syscall_table since truncate64 and truncate
274 * are identical on LP64 */
275 asmlinkage long sys_truncate64(const char __user * path, unsigned long length)
277 return ksys_truncate(path, length);
279 asmlinkage long sys_ftruncate64(unsigned int fd, unsigned long length)
281 return ksys_ftruncate(fd, length);
283 asmlinkage long sys_fcntl64(unsigned int fd, unsigned int cmd, unsigned long arg)
285 return sys_fcntl(fd, cmd, arg);
289 asmlinkage long parisc_truncate64(const char __user * path,
290 unsigned int high, unsigned int low)
292 return ksys_truncate(path, (loff_t)high << 32 | low);
295 asmlinkage long parisc_ftruncate64(unsigned int fd,
296 unsigned int high, unsigned int low)
298 return sys_ftruncate64(fd, (loff_t)high << 32 | low);
302 asmlinkage ssize_t parisc_pread64(unsigned int fd, char __user *buf, size_t count,
303 unsigned int high, unsigned int low)
305 return ksys_pread64(fd, buf, count, (loff_t)high << 32 | low);
308 asmlinkage ssize_t parisc_pwrite64(unsigned int fd, const char __user *buf,
309 size_t count, unsigned int high, unsigned int low)
311 return ksys_pwrite64(fd, buf, count, (loff_t)high << 32 | low);
314 asmlinkage ssize_t parisc_readahead(int fd, unsigned int high, unsigned int low,
317 return ksys_readahead(fd, (loff_t)high << 32 | low, count);
320 asmlinkage long parisc_fadvise64_64(int fd,
321 unsigned int high_off, unsigned int low_off,
322 unsigned int high_len, unsigned int low_len, int advice)
324 return ksys_fadvise64_64(fd, (loff_t)high_off << 32 | low_off,
325 (loff_t)high_len << 32 | low_len, advice);
328 asmlinkage long parisc_sync_file_range(int fd,
329 u32 hi_off, u32 lo_off, u32 hi_nbytes, u32 lo_nbytes,
332 return ksys_sync_file_range(fd, (loff_t)hi_off << 32 | lo_off,
333 (loff_t)hi_nbytes << 32 | lo_nbytes, flags);
336 asmlinkage long parisc_fallocate(int fd, int mode, u32 offhi, u32 offlo,
337 u32 lenhi, u32 lenlo)
339 return ksys_fallocate(fd, mode, ((u64)offhi << 32) | offlo,
340 ((u64)lenhi << 32) | lenlo);
343 asmlinkage long parisc_personality(unsigned long personality)
347 if (personality(current->personality) == PER_LINUX32
348 && personality(personality) == PER_LINUX)
349 personality = (personality & ~PER_MASK) | PER_LINUX32;
351 err = sys_personality(personality);
352 if (personality(err) == PER_LINUX32)
353 err = (err & ~PER_MASK) | PER_LINUX;
359 * Up to kernel v5.9 we defined O_NONBLOCK as 000200004,
360 * since then O_NONBLOCK is defined as 000200000.
362 * The following wrapper functions mask out the old
363 * O_NDELAY bit from calls which use O_NONBLOCK.
365 * XXX: Remove those in year 2022 (or later)?
368 #define O_NONBLOCK_OLD 000200004
369 #define O_NONBLOCK_MASK_OUT (O_NONBLOCK_OLD & ~O_NONBLOCK)
371 static int FIX_O_NONBLOCK(int flags)
373 if ((flags & O_NONBLOCK_MASK_OUT) &&
374 !test_thread_flag(TIF_NONBLOCK_WARNING)) {
375 set_thread_flag(TIF_NONBLOCK_WARNING);
376 pr_warn("%s(%d) uses a deprecated O_NONBLOCK value."
377 " Please recompile with newer glibc.\n",
378 current->comm, current->pid);
380 return flags & ~O_NONBLOCK_MASK_OUT;
383 asmlinkage long parisc_timerfd_create(int clockid, int flags)
385 flags = FIX_O_NONBLOCK(flags);
386 return sys_timerfd_create(clockid, flags);
389 asmlinkage long parisc_signalfd4(int ufd, sigset_t __user *user_mask,
390 size_t sizemask, int flags)
392 flags = FIX_O_NONBLOCK(flags);
393 return sys_signalfd4(ufd, user_mask, sizemask, flags);
397 asmlinkage long parisc_compat_signalfd4(int ufd,
398 compat_sigset_t __user *user_mask,
399 compat_size_t sizemask, int flags)
401 flags = FIX_O_NONBLOCK(flags);
402 return compat_sys_signalfd4(ufd, user_mask, sizemask, flags);
406 asmlinkage long parisc_eventfd2(unsigned int count, int flags)
408 flags = FIX_O_NONBLOCK(flags);
409 return sys_eventfd2(count, flags);
412 asmlinkage long parisc_userfaultfd(int flags)
414 flags = FIX_O_NONBLOCK(flags);
415 return sys_userfaultfd(flags);
418 asmlinkage long parisc_pipe2(int __user *fildes, int flags)
420 flags = FIX_O_NONBLOCK(flags);
421 return sys_pipe2(fildes, flags);
424 asmlinkage long parisc_inotify_init1(int flags)
426 flags = FIX_O_NONBLOCK(flags);
427 return sys_inotify_init1(flags);
433 * Up to kernel v6.1 parisc has different values than all other
434 * platforms for the MADV_xxx flags listed below.
435 * To keep binary compatibility with existing userspace programs
436 * translate the former values to the new values.
438 * XXX: Remove this wrapper in year 2025 (or later)
441 asmlinkage notrace long parisc_madvise(unsigned long start, size_t len_in, int behavior)
444 case 65: behavior = MADV_MERGEABLE; break;
445 case 66: behavior = MADV_UNMERGEABLE; break;
446 case 67: behavior = MADV_HUGEPAGE; break;
447 case 68: behavior = MADV_NOHUGEPAGE; break;
448 case 69: behavior = MADV_DONTDUMP; break;
449 case 70: behavior = MADV_DODUMP; break;
450 case 71: behavior = MADV_WIPEONFORK; break;
451 case 72: behavior = MADV_KEEPONFORK; break;
452 case 73: behavior = MADV_COLLAPSE; break;
455 return sys_madvise(start, len_in, behavior);