summaryrefslogtreecommitdiff
path: root/arch/parisc/kernel/sys_parisc.c
blob: 98af719d5f85b2b24a4c7af70415e97e90c73803 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
// SPDX-License-Identifier: GPL-2.0-or-later

/*
 *    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) 1999-2020 Helge Deller <deller@gmx.de>
 */

#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>
#include <linux/compat.h>
#include <linux/elf-randomize.h>

/*
 * Construct an artificial page offset for the mapping based on the physical
 * address of the kernel file mapping variable.
 */
#define GET_FILP_PGOFF(filp)		\
	(filp ? (((unsigned long) filp->f_mapping) >> 8)	\
		 & ((SHM_COLOUR-1) >> PAGE_SHIFT) : 0UL)

static unsigned long shared_align_offset(unsigned long filp_pgoff,
					 unsigned long pgoff)
{
	return (filp_pgoff + pgoff) << PAGE_SHIFT;
}

static inline unsigned long COLOR_ALIGN(unsigned long addr,
			 unsigned long filp_pgoff, unsigned long pgoff)
{
	unsigned long base = (addr+SHM_COLOUR-1) & ~(SHM_COLOUR-1);
	unsigned long off  = (SHM_COLOUR-1) &
		shared_align_offset(filp_pgoff, pgoff);
	return base + off;
}


#define STACK_SIZE_DEFAULT (USER_WIDE_MODE			\
			? (1 << 30)	/* 1 GB */		\
			: (CONFIG_STACK_MAX_DEFAULT_SIZE_MB*1024*1024))

unsigned long calc_max_stack_size(unsigned long stack_max)
{
#ifdef CONFIG_COMPAT
	if (!USER_WIDE_MODE && (stack_max == COMPAT_RLIM_INFINITY))
		stack_max = STACK_SIZE_DEFAULT;
	else
#endif
	if (stack_max == RLIM_INFINITY)
		stack_max = STACK_SIZE_DEFAULT;

	return stack_max;
}


/*
 * 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().
 */
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);

	stack_base = calc_max_stack_size(stack_base);

	/* Add space for stack randomization. */
	if (current->flags & PF_RANDOMIZE)
		stack_base += (STACK_RND_MASK << PAGE_SHIFT);

	return PAGE_ALIGN(STACK_TOP - stack_base);
}

enum mmap_allocation_direction {UP, DOWN};

static unsigned long arch_get_unmapped_area_common(struct file *filp,
	unsigned long addr, unsigned long len, unsigned long pgoff,
	unsigned long flags, enum mmap_allocation_direction dir)
{
	struct mm_struct *mm = current->mm;
	struct vm_area_struct *vma, *prev;
	unsigned long filp_pgoff;
	int do_color_align;
	struct vm_unmapped_area_info info;

	if (unlikely(len > TASK_SIZE))
		return -ENOMEM;

	do_color_align = 0;
	if (filp || (flags & MAP_SHARED))
		do_color_align = 1;
	filp_pgoff = GET_FILP_PGOFF(filp);

	if (flags & MAP_FIXED) {
		/* Even MAP_FIXED mappings must reside within TASK_SIZE */
		if (TASK_SIZE - len < addr)
			return -EINVAL;

		if ((flags & MAP_SHARED) && filp &&
		    (addr - shared_align_offset(filp_pgoff, pgoff))
				& (SHM_COLOUR - 1))
			return -EINVAL;
		return addr;
	}

	if (addr) {
		if (do_color_align)
			addr = COLOR_ALIGN(addr, filp_pgoff, 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)))
			return addr;
	}

	info.length = len;
	info.align_mask = do_color_align ? (PAGE_MASK & (SHM_COLOUR - 1)) : 0;
	info.align_offset = shared_align_offset(filp_pgoff, pgoff);

	if (dir == DOWN) {
		info.flags = VM_UNMAPPED_AREA_TOPDOWN;
		info.low_limit = PAGE_SIZE;
		info.high_limit = mm->mmap_base;
		addr = vm_unmapped_area(&info);
		if (!(addr & ~PAGE_MASK))
			return 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.
		 */
	}

	info.flags = 0;
	info.low_limit = mm->mmap_base;
	info.high_limit = mmap_upper_limit(NULL);
	return vm_unmapped_area(&info);
}

unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr,
	unsigned long len, unsigned long pgoff, unsigned long flags)
{
	return arch_get_unmapped_area_common(filp,
			addr, len, pgoff, flags, UP);
}

unsigned long arch_get_unmapped_area_topdown(struct file *filp,
	unsigned long addr, unsigned long len, unsigned long pgoff,
	unsigned long flags)
{
	return arch_get_unmapped_area_common(filp,
			addr, len, pgoff, flags, DOWN);
}

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);
}

asmlinkage 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;
}

/*
 * Up to kernel v5.9 we defined O_NONBLOCK as 000200004,
 * since then O_NONBLOCK is defined as 000200000.
 *
 * The following wrapper functions mask out the old
 * O_NDELAY bit from calls which use O_NONBLOCK.
 *
 * XXX: Remove those in year 2022 (or later)?
 */

#define O_NONBLOCK_OLD		000200004
#define O_NONBLOCK_MASK_OUT	(O_NONBLOCK_OLD & ~O_NONBLOCK)

static int FIX_O_NONBLOCK(int flags)
{
	if ((flags & O_NONBLOCK_MASK_OUT) &&
			!test_thread_flag(TIF_NONBLOCK_WARNING)) {
		set_thread_flag(TIF_NONBLOCK_WARNING);
		pr_warn("%s(%d) uses a deprecated O_NONBLOCK value."
			" Please recompile with newer glibc.\n",
			current->comm, current->pid);
	}
	return flags & ~O_NONBLOCK_MASK_OUT;
}

asmlinkage long parisc_timerfd_create(int clockid, int flags)
{
	flags = FIX_O_NONBLOCK(flags);
	return sys_timerfd_create(clockid, flags);
}

asmlinkage long parisc_signalfd4(int ufd, sigset_t __user *user_mask,
	size_t sizemask, int flags)
{
	flags = FIX_O_NONBLOCK(flags);
	return sys_signalfd4(ufd, user_mask, sizemask, flags);
}

#ifdef CONFIG_COMPAT
asmlinkage long parisc_compat_signalfd4(int ufd,
	compat_sigset_t __user *user_mask,
	compat_size_t sizemask, int flags)
{
	flags = FIX_O_NONBLOCK(flags);
	return compat_sys_signalfd4(ufd, user_mask, sizemask, flags);
}
#endif

asmlinkage long parisc_eventfd2(unsigned int count, int flags)
{
	flags = FIX_O_NONBLOCK(flags);
	return sys_eventfd2(count, flags);
}

asmlinkage long parisc_userfaultfd(int flags)
{
	flags = FIX_O_NONBLOCK(flags);
	return sys_userfaultfd(flags);
}

asmlinkage long parisc_pipe2(int __user *fildes, int flags)
{
	flags = FIX_O_NONBLOCK(flags);
	return sys_pipe2(fildes, flags);
}

asmlinkage long parisc_inotify_init1(int flags)
{
	flags = FIX_O_NONBLOCK(flags);
	return sys_inotify_init1(flags);
}

/*
 * madvise() wrapper
 *
 * Up to kernel v6.1 parisc has different values than all other
 * platforms for the MADV_xxx flags listed below.
 * To keep binary compatibility with existing userspace programs
 * translate the former values to the new values.
 *
 * XXX: Remove this wrapper in year 2025 (or later)
 */

asmlinkage notrace long parisc_madvise(unsigned long start, size_t len_in, int behavior)
{
	switch (behavior) {
	case 65: behavior = MADV_MERGEABLE;	break;
	case 66: behavior = MADV_UNMERGEABLE;	break;
	case 67: behavior = MADV_HUGEPAGE;	break;
	case 68: behavior = MADV_NOHUGEPAGE;	break;
	case 69: behavior = MADV_DONTDUMP;	break;
	case 70: behavior = MADV_DODUMP;	break;
	case 71: behavior = MADV_WIPEONFORK;	break;
	case 72: behavior = MADV_KEEPONFORK;	break;
	case 73: behavior = MADV_COLLAPSE;	break;
	}

	return sys_madvise(start, len_in, behavior);
}