/* SPDX-License-Identifier: GPL-2.0 */ #ifndef __ALPHA_UACCESS_H #define __ALPHA_UACCESS_H /* * The fs value determines whether argument validity checking should be * performed or not. If get_fs() == USER_DS, checking is performed, with * get_fs() == KERNEL_DS, checking is bypassed. * * Or at least it did once upon a time. Nowadays it is a mask that * defines which bits of the address space are off limits. This is a * wee bit faster than the above. * * For historical reasons, these macros are grossly misnamed. */ #define KERNEL_DS ((mm_segment_t) { 0UL }) #define USER_DS ((mm_segment_t) { -0x40000000000UL }) #define get_fs() (current_thread_info()->addr_limit) #define get_ds() (KERNEL_DS) #define set_fs(x) (current_thread_info()->addr_limit = (x)) #define segment_eq(a, b) ((a).seg == (b).seg) /* * Is a address valid? This does a straightforward calculation rather * than tests. * * Address valid if: * - "addr" doesn't have any high-bits set * - AND "size" doesn't have any high-bits set * - AND "addr+size-(size != 0)" doesn't have any high-bits set * - OR we are in kernel mode. */ #define __access_ok(addr, size) ({ \ unsigned long __ao_a = (addr), __ao_b = (size); \ unsigned long __ao_end = __ao_a + __ao_b - !!__ao_b; \ (get_fs().seg & (__ao_a | __ao_b | __ao_end)) == 0; }) #define access_ok(type, addr, size) \ ({ \ __chk_user_ptr(addr); \ __access_ok(((unsigned long)(addr)), (size)); \ }) /* * These are the main single-value transfer routines. They automatically * use the right size if we just have the right pointer type. * * As the alpha uses the same address space for kernel and user * data, we can just do these as direct assignments. (Of course, the * exception handling means that it's no longer "just"...) * * Careful to not * (a) re-use the arguments for side effects (sizeof/typeof is ok) * (b) require any knowledge of processes at this stage */ #define put_user(x, ptr) \ __put_user_check((__typeof__(*(ptr)))(x), (ptr), sizeof(*(ptr))) #define get_user(x, ptr) \ __get_user_check((x), (ptr), sizeof(*(ptr))) /* * The "__xxx" versions do not do address space checking, useful when * doing multiple accesses to the same area (the programmer has to do the * checks by hand with "access_ok()") */ #define __put_user(x, ptr) \ __put_user_nocheck((__typeof__(*(ptr)))(x), (ptr), sizeof(*(ptr))) #define __get_user(x, ptr) \ __get_user_nocheck((x), (ptr), sizeof(*(ptr))) /* * The "lda %1, 2b-1b(%0)" bits are magic to get the assembler to * encode the bits we need for resolving the exception. See the * more extensive comments with fixup_inline_exception below for * more information. */ #define EXC(label,cont,res,err) \ ".section __ex_table,\"a\"\n" \ " .long "#label"-.\n" \ " lda "#res","#cont"-"#label"("#err")\n" \ ".previous\n" extern void __get_user_unknown(void); #define __get_user_nocheck(x, ptr, size) \ ({ \ long __gu_err = 0; \ unsigned long __gu_val; \ __chk_user_ptr(ptr); \ switch (size) { \ case 1: __get_user_8(ptr); break; \ case 2: __get_user_16(ptr); break; \ case 4: __get_user_32(ptr); break; \ case 8: __get_user_64(ptr); break; \ default: __get_user_unknown(); break; \ } \ (x) = (__force __typeof__(*(ptr))) __gu_val; \ __gu_err; \ }) #define __get_user_check(x, ptr, size) \ ({ \ long __gu_err = -EFAULT; \ unsigned long __gu_val = 0; \ const __typeof__(*(ptr)) __user *__gu_addr = (ptr); \ if (__access_ok((unsigned long)__gu_addr, size)) { \ __gu_err = 0; \ switch (size) { \ case 1: __get_user_8(__gu_addr); break; \ case 2: __get_user_16(__gu_addr); break; \ case 4: __get_user_32(__gu_addr); break; \ case 8: __get_user_64(__gu_addr); break; \ default: __get_user_unknown(); break; \ } \ } \ (x) = (__force __typeof__(*(ptr))) __gu_val; \ __gu_err; \ }) struct __large_struct { unsigned long buf[100]; }; #define __m(x) (*(struct __large_struct __user *)(x)) #define __get_user_64(addr) \ __asm__("1: ldq %0,%2\n" \ "2:\n" \ EXC(1b,2b,%0,%1) \ : "=r"(__gu_val), "=r"(__gu_err) \ : "m"(__m(addr)), "1"(__gu_err)) #define __get_user_32(addr) \ __asm__("1: ldl %0,%2\n" \ "2:\n" \ EXC(1b,2b,%0,%1) \ : "=r"(__gu_val), "=r"(__gu_err) \ : "m"(__m(addr)), "1"(__gu_err)) #ifdef __alpha_bwx__ /* Those lucky bastards with ev56 and later CPUs can do byte/word moves. */ #define __get_user_16(addr) \ __asm__("1: ldwu %0,%2\n" \ "2:\n" \ EXC(1b,2b,%0,%1) \ : "=r"(__gu_val), "=r"(__gu_err) \ : "m"(__m(addr)), "1"(__gu_err)) #define __get_user_8(addr) \ __asm__("1: ldbu %0,%2\n" \ "2:\n" \ EXC(1b,2b,%0,%1) \ : "=r"(__gu_val), "=r"(__gu_err) \ : "m"(__m(addr)), "1"(__gu_err)) #else /* Unfortunately, we can't get an unaligned access trap for the sub-word load, so we have to do a general unaligned operation. */ #define __get_user_16(addr) \ { \ long __gu_tmp; \ __asm__("1: ldq_u %0,0(%3)\n" \ "2: ldq_u %1,1(%3)\n" \ " extwl %0,%3,%0\n" \ " extwh %1,%3,%1\n" \ " or %0,%1,%0\n" \ "3:\n" \ EXC(1b,3b,%0,%2) \ EXC(2b,3b,%0,%2) \ : "=&r"(__gu_val), "=&r"(__gu_tmp), "=r"(__gu_err) \ : "r"(addr), "2"(__gu_err)); \ } #define __get_user_8(addr) \ __asm__("1: ldq_u %0,0(%2)\n" \ " extbl %0,%2,%0\n" \ "2:\n" \ EXC(1b,2b,%0,%1) \ : "=&r"(__gu_val), "=r"(__gu_err) \ : "r"(addr), "1"(__gu_err)) #endif extern void __put_user_unknown(void); #define __put_user_nocheck(x, ptr, size) \ ({ \ long __pu_err = 0; \ __chk_user_ptr(ptr); \ switch (size) { \ case 1: __put_user_8(x, ptr); break; \ case 2: __put_user_16(x, ptr); break; \ case 4: __put_user_32(x, ptr); break; \ case 8: __put_user_64(x, ptr); break; \ default: __put_user_unknown(); break; \ } \ __pu_err; \ }) #define __put_user_check(x, ptr, size) \ ({ \ long __pu_err = -EFAULT; \ __typeof__(*(ptr)) __user *__pu_addr = (ptr); \ if (__access_ok((unsigned long)__pu_addr, size)) { \ __pu_err = 0; \ switch (size) { \ case 1: __put_user_8(x, __pu_addr); break; \ case 2: __put_user_16(x, __pu_addr); break; \ case 4: __put_user_32(x, __pu_addr); break; \ case 8: __put_user_64(x, __pu_addr); break; \ default: __put_user_unknown(); break; \ } \ } \ __pu_err; \ }) /* * The "__put_user_xx()" macros tell gcc they read from memory * instead of writing: this is because they do not write to * any memory gcc knows about, so there are no aliasing issues */ #define __put_user_64(x, addr) \ __asm__ __volatile__("1: stq %r2,%1\n" \ "2:\n" \ EXC(1b,2b,$31,%0) \ : "=r"(__pu_err) \ : "m" (__m(addr)), "rJ" (x), "0"(__pu_err)) #define __put_user_32(x, addr) \ __asm__ __volatile__("1: stl %r2,%1\n" \ "2:\n" \ EXC(1b,2b,$31,%0) \ : "=r"(__pu_err) \ : "m"(__m(addr)), "rJ"(x), "0"(__pu_err)) #ifdef __alpha_bwx__ /* Those lucky bastards with ev56 and later CPUs can do byte/word moves. */ #define __put_user_16(x, addr) \ __asm__ __volatile__("1: stw %r2,%1\n" \ "2:\n" \ EXC(1b,2b,$31,%0) \ : "=r"(__pu_err) \ : "m"(__m(addr)), "rJ"(x), "0"(__pu_err)) #define __put_user_8(x, addr) \ __asm__ __volatile__("1: stb %r2,%1\n" \ "2:\n" \ EXC(1b,2b,$31,%0) \ : "=r"(__pu_err) \ : "m"(__m(addr)), "rJ"(x), "0"(__pu_err)) #else /* Unfortunately, we can't get an unaligned access trap for the sub-word write, so we have to do a general unaligned operation. */ #define __put_user_16(x, addr) \ { \ long __pu_tmp1, __pu_tmp2, __pu_tmp3, __pu_tmp4; \ __asm__ __volatile__( \ "1: ldq_u %2,1(%5)\n" \ "2: ldq_u %1,0(%5)\n" \ " inswh %6,%5,%4\n" \ " inswl %6,%5,%3\n" \ " mskwh %2,%5,%2\n" \ " mskwl %1,%5,%1\n" \ " or %2,%4,%2\n" \ " or %1,%3,%1\n" \ "3: stq_u %2,1(%5)\n" \ "4: stq_u %1,0(%5)\n" \ "5:\n" \ EXC(1b,5b,$31,%0) \ EXC(2b,5b,$31,%0) \ EXC(3b,5b,$31,%0) \ EXC(4b,5b,$31,%0) \ : "=r"(__pu_err), "=&r"(__pu_tmp1), \ "=&r"(__pu_tmp2), "=&r"(__pu_tmp3), \ "=&r"(__pu_tmp4) \ : "r"(addr), "r"((unsigned long)(x)), "0"(__pu_err)); \ } #define __put_user_8(x, addr) \ { \ long __pu_tmp1, __pu_tmp2; \ __asm__ __volatile__( \ "1: ldq_u %1,0(%4)\n" \ " insbl %3,%4,%2\n" \ " mskbl %1,%4,%1\n" \ " or %1,%2,%1\n" \ "2: stq_u %1,0(%4)\n" \ "3:\n" \ EXC(1b,3b,$31,%0) \ EXC(2b,3b,$31,%0) \ : "=r"(__pu_err), \ "=&r"(__pu_tmp1), "=&r"(__pu_tmp2) \ : "r"((unsigned long)(x)), "r"(addr), "0"(__pu_err)); \ } #endif /* * Complex access routines */ extern long __copy_user(void *to, const void *from, long len); static inline unsigned long raw_copy_from_user(void *to, const void __user *from, unsigned long len) { return __copy_user(to, (__force const void *)from, len); } static inline unsigned long raw_copy_to_user(void __user *to, const void *from, unsigned long len) { return __copy_user((__force void *)to, from, len); } extern long __clear_user(void __user *to, long len); extern inline long clear_user(void __user *to, long len) { if (__access_ok((unsigned long)to, len)) len = __clear_user(to, len); return len; } #define user_addr_max() \ (uaccess_kernel() ? ~0UL : TASK_SIZE) extern long strncpy_from_user(char *dest, const char __user *src, long count); extern __must_check long strnlen_user(const char __user *str, long n); #include <asm/extable.h> #endif /* __ALPHA_UACCESS_H */
Name | Type | Size | Permission | Actions |
---|---|---|---|---|
Kbuild | File | 320 B | 0644 |
|
a.out-core.h | File | 2.41 KB | 0644 |
|
a.out.h | File | 574 B | 0644 |
|
agp.h | File | 457 B | 0644 |
|
agp_backend.h | File | 948 B | 0644 |
|
asm-offsets.h | File | 35 B | 0644 |
|
asm-prototypes.h | File | 405 B | 0644 |
|
atomic.h | File | 9.15 KB | 0644 |
|
barrier.h | File | 2.17 KB | 0644 |
|
bitops.h | File | 8.83 KB | 0644 |
|
bug.h | File | 571 B | 0644 |
|
bugs.h | File | 294 B | 0644 |
|
cache.h | File | 507 B | 0644 |
|
cacheflush.h | File | 2.68 KB | 0644 |
|
checksum.h | File | 1.93 KB | 0644 |
|
cmpxchg.h | File | 1.67 KB | 0644 |
|
compiler.h | File | 498 B | 0644 |
|
console.h | File | 1.06 KB | 0644 |
|
core_apecs.h | File | 16.91 KB | 0644 |
|
core_cia.h | File | 15.43 KB | 0644 |
|
core_irongate.h | File | 6.63 KB | 0644 |
|
core_lca.h | File | 11.36 KB | 0644 |
|
core_marvel.h | File | 9.15 KB | 0644 |
|
core_mcpcia.h | File | 11.45 KB | 0644 |
|
core_polaris.h | File | 2.92 KB | 0644 |
|
core_t2.h | File | 19.13 KB | 0644 |
|
core_titan.h | File | 11.2 KB | 0644 |
|
core_tsunami.h | File | 8.29 KB | 0644 |
|
core_wildfire.h | File | 8.45 KB | 0644 |
|
delay.h | File | 264 B | 0644 |
|
device.h | File | 129 B | 0644 |
|
div64.h | File | 31 B | 0644 |
|
dma-mapping.h | File | 276 B | 0644 |
|
dma.h | File | 12.37 KB | 0644 |
|
elf.h | File | 5.71 KB | 0644 |
|
emergency-restart.h | File | 149 B | 0644 |
|
err_common.h | File | 3.24 KB | 0644 |
|
err_ev6.h | File | 116 B | 0644 |
|
err_ev7.h | File | 4.37 KB | 0644 |
|
extable.h | File | 1.42 KB | 0644 |
|
floppy.h | File | 3.07 KB | 0644 |
|
fpu.h | File | 1.78 KB | 0644 |
|
ftrace.h | File | 12 B | 0644 |
|
futex.h | File | 1.97 KB | 0644 |
|
gct.h | File | 1.02 KB | 0644 |
|
hardirq.h | File | 223 B | 0644 |
|
hw_irq.h | File | 302 B | 0644 |
|
hwrpb.h | File | 6.9 KB | 0644 |
|
io.h | File | 15.03 KB | 0644 |
|
io_trivial.h | File | 3.07 KB | 0644 |
|
irq.h | File | 2.31 KB | 0644 |
|
irq_regs.h | File | 34 B | 0644 |
|
irqflags.h | File | 1.17 KB | 0644 |
|
jensen.h | File | 8.39 KB | 0644 |
|
kdebug.h | File | 32 B | 0644 |
|
kmap_types.h | File | 265 B | 0644 |
|
linkage.h | File | 256 B | 0644 |
|
local.h | File | 2.59 KB | 0644 |
|
local64.h | File | 33 B | 0644 |
|
machvec.h | File | 3.68 KB | 0644 |
|
mc146818rtc.h | File | 680 B | 0644 |
|
mce.h | File | 4.04 KB | 0644 |
|
mmu.h | File | 203 B | 0644 |
|
mmu_context.h | File | 7.09 KB | 0644 |
|
mmzone.h | File | 2.98 KB | 0644 |
|
module.h | File | 329 B | 0644 |
|
page.h | File | 2.46 KB | 0644 |
|
pal.h | File | 5.01 KB | 0644 |
|
param.h | File | 284 B | 0644 |
|
parport.h | File | 536 B | 0644 |
|
pci.h | File | 2.87 KB | 0644 |
|
percpu.h | File | 527 B | 0644 |
|
perf_event.h | File | 105 B | 0644 |
|
pgalloc.h | File | 1.82 KB | 0644 |
|
pgtable.h | File | 13.17 KB | 0644 |
|
processor.h | File | 2.07 KB | 0644 |
|
ptrace.h | File | 754 B | 0644 |
|
rwsem.h | File | 4.62 KB | 0644 |
|
segment.h | File | 132 B | 0644 |
|
serial.h | File | 1.01 KB | 0644 |
|
sfp-machine.h | File | 2.86 KB | 0644 |
|
shmparam.h | File | 191 B | 0644 |
|
signal.h | File | 627 B | 0644 |
|
smp.h | File | 1.34 KB | 0644 |
|
socket.h | File | 310 B | 0644 |
|
special_insns.h | File | 925 B | 0644 |
|
spinlock.h | File | 2.85 KB | 0644 |
|
spinlock_types.h | File | 413 B | 0644 |
|
string.h | File | 2.42 KB | 0644 |
|
switch_to.h | File | 406 B | 0644 |
|
syscall.h | File | 235 B | 0644 |
|
termios.h | File | 2.98 KB | 0644 |
|
thread_info.h | File | 3.63 KB | 0644 |
|
timex.h | File | 827 B | 0644 |
|
tlb.h | File | 473 B | 0644 |
|
tlbflush.h | File | 3.37 KB | 0644 |
|
topology.h | File | 957 B | 0644 |
|
types.h | File | 143 B | 0644 |
|
uaccess.h | File | 9.56 KB | 0644 |
|
ucontext.h | File | 348 B | 0644 |
|
unaligned.h | File | 340 B | 0644 |
|
unistd.h | File | 494 B | 0644 |
|
user.h | File | 2.14 KB | 0644 |
|
vga.h | File | 2 KB | 0644 |
|
word-at-a-time.h | File | 1.34 KB | 0644 |
|
wrperfmon.h | File | 2.56 KB | 0644 |
|
xchg.h | File | 5.74 KB | 0644 |
|
xor.h | File | 21.71 KB | 0644 |
|