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Diffstat (limited to 'include/asm-alpha/uaccess.h')
| -rw-r--r-- | include/asm-alpha/uaccess.h | 511 |
1 files changed, 0 insertions, 511 deletions
diff --git a/include/asm-alpha/uaccess.h b/include/asm-alpha/uaccess.h deleted file mode 100644 index 22de3b434a22..000000000000 --- a/include/asm-alpha/uaccess.h +++ /dev/null @@ -1,511 +0,0 @@ -#ifndef __ALPHA_UACCESS_H -#define __ALPHA_UACCESS_H - -#include <linux/errno.h> -#include <linux/sched.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 VERIFY_READ 0 -#define VERIFY_WRITE 1 - -#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" doesn't have any high-bits set - * - OR we are in kernel mode. - */ -#define __access_ok(addr,size,segment) \ - (((segment).seg & (addr | size | (addr+size))) == 0) - -#define access_ok(type,addr,size) \ -({ \ - __chk_user_ptr(addr); \ - __access_ok(((unsigned long)(addr)),(size),get_fs()); \ -}) - -/* - * 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)),get_fs()) -#define get_user(x,ptr) \ - __get_user_check((x),(ptr),sizeof(*(ptr)),get_fs()) - -/* - * 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. - */ - -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) = (__typeof__(*(ptr))) __gu_val; \ - __gu_err; \ -}) - -#define __get_user_check(x,ptr,size,segment) \ -({ \ - long __gu_err = -EFAULT; \ - unsigned long __gu_val = 0; \ - const __typeof__(*(ptr)) __user *__gu_addr = (ptr); \ - if (__access_ok((unsigned long)__gu_addr,size,segment)) { \ - __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) = (__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" \ - ".section __ex_table,\"a\"\n" \ - " .long 1b - .\n" \ - " lda %0, 2b-1b(%1)\n" \ - ".previous" \ - : "=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" \ - ".section __ex_table,\"a\"\n" \ - " .long 1b - .\n" \ - " lda %0, 2b-1b(%1)\n" \ - ".previous" \ - : "=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" \ - ".section __ex_table,\"a\"\n" \ - " .long 1b - .\n" \ - " lda %0, 2b-1b(%1)\n" \ - ".previous" \ - : "=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" \ - ".section __ex_table,\"a\"\n" \ - " .long 1b - .\n" \ - " lda %0, 2b-1b(%1)\n" \ - ".previous" \ - : "=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" \ - ".section __ex_table,\"a\"\n" \ - " .long 1b - .\n" \ - " lda %0, 3b-1b(%2)\n" \ - " .long 2b - .\n" \ - " lda %0, 3b-2b(%2)\n" \ - ".previous" \ - : "=&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" \ - ".section __ex_table,\"a\"\n" \ - " .long 1b - .\n" \ - " lda %0, 2b-1b(%1)\n" \ - ".previous" \ - : "=&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,segment) \ -({ \ - long __pu_err = -EFAULT; \ - __typeof__(*(ptr)) __user *__pu_addr = (ptr); \ - if (__access_ok((unsigned long)__pu_addr,size,segment)) { \ - __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" \ - ".section __ex_table,\"a\"\n" \ - " .long 1b - .\n" \ - " lda $31,2b-1b(%0)\n" \ - ".previous" \ - : "=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" \ - ".section __ex_table,\"a\"\n" \ - " .long 1b - .\n" \ - " lda $31,2b-1b(%0)\n" \ - ".previous" \ - : "=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" \ - ".section __ex_table,\"a\"\n" \ - " .long 1b - .\n" \ - " lda $31,2b-1b(%0)\n" \ - ".previous" \ - : "=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" \ - ".section __ex_table,\"a\"\n" \ - " .long 1b - .\n" \ - " lda $31,2b-1b(%0)\n" \ - ".previous" \ - : "=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" \ - ".section __ex_table,\"a\"\n" \ - " .long 1b - .\n" \ - " lda $31, 5b-1b(%0)\n" \ - " .long 2b - .\n" \ - " lda $31, 5b-2b(%0)\n" \ - " .long 3b - .\n" \ - " lda $31, 5b-3b(%0)\n" \ - " .long 4b - .\n" \ - " lda $31, 5b-4b(%0)\n" \ - ".previous" \ - : "=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" \ - ".section __ex_table,\"a\"\n" \ - " .long 1b - .\n" \ - " lda $31, 3b-1b(%0)\n" \ - " .long 2b - .\n" \ - " lda $31, 3b-2b(%0)\n" \ - ".previous" \ - : "=r"(__pu_err), \ - "=&r"(__pu_tmp1), "=&r"(__pu_tmp2) \ - : "r"((unsigned long)(x)), "r"(addr), "0"(__pu_err)); \ -} -#endif - - -/* - * Complex access routines - */ - -/* This little bit of silliness is to get the GP loaded for a function - that ordinarily wouldn't. Otherwise we could have it done by the macro - directly, which can be optimized the linker. */ -#ifdef MODULE -#define __module_address(sym) "r"(sym), -#define __module_call(ra, arg, sym) "jsr $" #ra ",(%" #arg ")," #sym -#else -#define __module_address(sym) -#define __module_call(ra, arg, sym) "bsr $" #ra "," #sym " !samegp" -#endif - -extern void __copy_user(void); - -extern inline long -__copy_tofrom_user_nocheck(void *to, const void *from, long len) -{ - register void * __cu_to __asm__("$6") = to; - register const void * __cu_from __asm__("$7") = from; - register long __cu_len __asm__("$0") = len; - - __asm__ __volatile__( - __module_call(28, 3, __copy_user) - : "=r" (__cu_len), "=r" (__cu_from), "=r" (__cu_to) - : __module_address(__copy_user) - "0" (__cu_len), "1" (__cu_from), "2" (__cu_to) - : "$1","$2","$3","$4","$5","$28","memory"); - - return __cu_len; -} - -extern inline long -__copy_tofrom_user(void *to, const void *from, long len, const void __user *validate) -{ - if (__access_ok((unsigned long)validate, len, get_fs())) - len = __copy_tofrom_user_nocheck(to, from, len); - return len; -} - -#define __copy_to_user(to,from,n) \ -({ \ - __chk_user_ptr(to); \ - __copy_tofrom_user_nocheck((__force void *)(to),(from),(n)); \ -}) -#define __copy_from_user(to,from,n) \ -({ \ - __chk_user_ptr(from); \ - __copy_tofrom_user_nocheck((to),(__force void *)(from),(n)); \ -}) - -#define __copy_to_user_inatomic __copy_to_user -#define __copy_from_user_inatomic __copy_from_user - - -extern inline long -copy_to_user(void __user *to, const void *from, long n) -{ - return __copy_tofrom_user((__force void *)to, from, n, to); -} - -extern inline long -copy_from_user(void *to, const void __user *from, long n) -{ - return __copy_tofrom_user(to, (__force void *)from, n, from); -} - -extern void __do_clear_user(void); - -extern inline long -__clear_user(void __user *to, long len) -{ - register void __user * __cl_to __asm__("$6") = to; - register long __cl_len __asm__("$0") = len; - __asm__ __volatile__( - __module_call(28, 2, __do_clear_user) - : "=r"(__cl_len), "=r"(__cl_to) - : __module_address(__do_clear_user) - "0"(__cl_len), "1"(__cl_to) - : "$1","$2","$3","$4","$5","$28","memory"); - return __cl_len; -} - -extern inline long -clear_user(void __user *to, long len) -{ - if (__access_ok((unsigned long)to, len, get_fs())) - len = __clear_user(to, len); - return len; -} - -#undef __module_address -#undef __module_call - -/* Returns: -EFAULT if exception before terminator, N if the entire - buffer filled, else strlen. */ - -extern long __strncpy_from_user(char *__to, const char __user *__from, long __to_len); - -extern inline long -strncpy_from_user(char *to, const char __user *from, long n) -{ - long ret = -EFAULT; - if (__access_ok((unsigned long)from, 0, get_fs())) - ret = __strncpy_from_user(to, from, n); - return ret; -} - -/* Returns: 0 if bad, string length+1 (memory size) of string if ok */ -extern long __strlen_user(const char __user *); - -extern inline long strlen_user(const char __user *str) -{ - return access_ok(VERIFY_READ,str,0) ? __strlen_user(str) : 0; -} - -/* Returns: 0 if exception before NUL or reaching the supplied limit (N), - * a value greater than N if the limit would be exceeded, else strlen. */ -extern long __strnlen_user(const char __user *, long); - -extern inline long strnlen_user(const char __user *str, long n) -{ - return access_ok(VERIFY_READ,str,0) ? __strnlen_user(str, n) : 0; -} - -/* - * About the exception table: - * - * - insn is a 32-bit pc-relative offset from the faulting insn. - * - nextinsn is a 16-bit offset off of the faulting instruction - * (not off of the *next* instruction as branches are). - * - errreg is the register in which to place -EFAULT. - * - valreg is the final target register for the load sequence - * and will be zeroed. - * - * Either errreg or valreg may be $31, in which case nothing happens. - * - * The exception fixup information "just so happens" to be arranged - * as in a MEM format instruction. This lets us emit our three - * values like so: - * - * lda valreg, nextinsn(errreg) - * - */ - -struct exception_table_entry -{ - signed int insn; - union exception_fixup { - unsigned unit; - struct { - signed int nextinsn : 16; - unsigned int errreg : 5; - unsigned int valreg : 5; - } bits; - } fixup; -}; - -/* Returns the new pc */ -#define fixup_exception(map_reg, fixup, pc) \ -({ \ - if ((fixup)->fixup.bits.valreg != 31) \ - map_reg((fixup)->fixup.bits.valreg) = 0; \ - if ((fixup)->fixup.bits.errreg != 31) \ - map_reg((fixup)->fixup.bits.errreg) = -EFAULT; \ - (pc) + (fixup)->fixup.bits.nextinsn; \ -}) - - -#endif /* __ALPHA_UACCESS_H */ |