diff options
Diffstat (limited to 'arch/sparc/include/asm/uaccess_32.h')
| -rw-r--r-- | arch/sparc/include/asm/uaccess_32.h | 398 |
1 files changed, 153 insertions, 245 deletions
diff --git a/arch/sparc/include/asm/uaccess_32.h b/arch/sparc/include/asm/uaccess_32.h index 53a28dd59f59..43284b6ec46a 100644 --- a/arch/sparc/include/asm/uaccess_32.h +++ b/arch/sparc/include/asm/uaccess_32.h @@ -1,3 +1,4 @@ +/* SPDX-License-Identifier: GPL-2.0 */ /* * uaccess.h: User space memore access functions. * @@ -7,80 +8,11 @@ #ifndef _ASM_UACCESS_H #define _ASM_UACCESS_H -#ifdef __KERNEL__ #include <linux/compiler.h> -#include <linux/sched.h> #include <linux/string.h> -#include <linux/errno.h> -#endif - -#ifndef __ASSEMBLY__ #include <asm/processor.h> - -#define ARCH_HAS_SORT_EXTABLE -#define ARCH_HAS_SEARCH_EXTABLE - -/* Sparc is not segmented, however we need to be able to fool access_ok() - * when doing system calls from kernel mode legitimately. - * - * "For historical reasons, these macros are grossly misnamed." -Linus - */ - -#define KERNEL_DS ((mm_segment_t) { 0 }) -#define USER_DS ((mm_segment_t) { -1 }) - -#define VERIFY_READ 0 -#define VERIFY_WRITE 1 - -#define get_ds() (KERNEL_DS) -#define get_fs() (current->thread.current_ds) -#define set_fs(val) ((current->thread.current_ds) = (val)) - -#define segment_eq(a,b) ((a).seg == (b).seg) - -/* We have there a nice not-mapped page at PAGE_OFFSET - PAGE_SIZE, so that this test - * can be fairly lightweight. - * No one can read/write anything from userland in the kernel space by setting - * large size and address near to PAGE_OFFSET - a fault will break his intentions. - */ -#define __user_ok(addr, size) ({ (void)(size); (addr) < STACK_TOP; }) -#define __kernel_ok (segment_eq(get_fs(), KERNEL_DS)) -#define __access_ok(addr,size) (__user_ok((addr) & get_fs().seg,(size))) -#define access_ok(type, addr, size) \ - ({ (void)(type); __access_ok((unsigned long)(addr), size); }) - -/* - * The exception table consists of pairs of addresses: the first is the - * address of an instruction that is allowed to fault, and the second is - * the address at which the program should continue. No registers are - * modified, so it is entirely up to the continuation code to figure out - * what to do. - * - * All the routines below use bits of fixup code that are out of line - * with the main instruction path. This means when everything is well, - * we don't even have to jump over them. Further, they do not intrude - * on our cache or tlb entries. - * - * There is a special way how to put a range of potentially faulting - * insns (like twenty ldd/std's with now intervening other instructions) - * You specify address of first in insn and 0 in fixup and in the next - * exception_table_entry you specify last potentially faulting insn + 1 - * and in fixup the routine which should handle the fault. - * That fixup code will get - * (faulting_insn_address - first_insn_in_the_range_address)/4 - * in %g2 (ie. index of the faulting instruction in the range). - */ - -struct exception_table_entry -{ - unsigned long insn, fixup; -}; - -/* Returns 0 if exception not found and fixup otherwise. */ -extern unsigned long search_extables_range(unsigned long addr, unsigned long *g2); - -extern void __ret_efault(void); +#include <asm-generic/access_ok.h> /* Uh, these should become the main single-value transfer routines.. * They automatically use the right size if we just have the right @@ -91,203 +23,182 @@ extern void __ret_efault(void); * of a performance impact. Thus we have a few rather ugly macros here, * and hide all the ugliness from the user. */ -#define put_user(x,ptr) ({ \ -unsigned long __pu_addr = (unsigned long)(ptr); \ -__chk_user_ptr(ptr); \ -__put_user_check((__typeof__(*(ptr)))(x),__pu_addr,sizeof(*(ptr))); }) - -#define get_user(x,ptr) ({ \ -unsigned long __gu_addr = (unsigned long)(ptr); \ -__chk_user_ptr(ptr); \ -__get_user_check((x),__gu_addr,sizeof(*(ptr)),__typeof__(*(ptr))); }) +#define put_user(x, ptr) ({ \ + void __user *__pu_addr = (ptr); \ + __chk_user_ptr(ptr); \ + __put_user_check((__typeof__(*(ptr)))(x), __pu_addr, sizeof(*(ptr))); \ +}) + +#define get_user(x, ptr) ({ \ + const void __user *__gu_addr = (ptr); \ + __chk_user_ptr(ptr); \ + __get_user_check((x), __gu_addr, sizeof(*(ptr)), __typeof__(*(ptr))); \ +}) /* * The "__xxx" versions do not do address space checking, useful when * doing multiple accesses to the same area (the user 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)),__typeof__(*(ptr))) +#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)), __typeof__(*(ptr))) struct __large_struct { unsigned long buf[100]; }; #define __m(x) ((struct __large_struct __user *)(x)) -#define __put_user_check(x,addr,size) ({ \ -register int __pu_ret; \ -if (__access_ok(addr,size)) { \ -switch (size) { \ -case 1: __put_user_asm(x,b,addr,__pu_ret); break; \ -case 2: __put_user_asm(x,h,addr,__pu_ret); break; \ -case 4: __put_user_asm(x,,addr,__pu_ret); break; \ -case 8: __put_user_asm(x,d,addr,__pu_ret); break; \ -default: __pu_ret = __put_user_bad(); break; \ -} } else { __pu_ret = -EFAULT; } __pu_ret; }) - -#define __put_user_nocheck(x,addr,size) ({ \ -register int __pu_ret; \ -switch (size) { \ -case 1: __put_user_asm(x,b,addr,__pu_ret); break; \ -case 2: __put_user_asm(x,h,addr,__pu_ret); break; \ -case 4: __put_user_asm(x,,addr,__pu_ret); break; \ -case 8: __put_user_asm(x,d,addr,__pu_ret); break; \ -default: __pu_ret = __put_user_bad(); break; \ -} __pu_ret; }) - -#define __put_user_asm(x,size,addr,ret) \ +#define __put_user_check(x, addr, size) ({ \ + register int __pu_ret; \ + if (__access_ok(addr, size)) { \ + switch (size) { \ + case 1: \ + __put_user_asm(x, b, addr, __pu_ret); \ + break; \ + case 2: \ + __put_user_asm(x, h, addr, __pu_ret); \ + break; \ + case 4: \ + __put_user_asm(x, , addr, __pu_ret); \ + break; \ + case 8: \ + __put_user_asm(x, d, addr, __pu_ret); \ + break; \ + default: \ + __pu_ret = __put_user_bad(); \ + break; \ + } \ + } else { \ + __pu_ret = -EFAULT; \ + } \ + __pu_ret; \ +}) + +#define __put_user_nocheck(x, addr, size) ({ \ + register int __pu_ret; \ + switch (size) { \ + case 1: __put_user_asm(x, b, addr, __pu_ret); break; \ + case 2: __put_user_asm(x, h, addr, __pu_ret); break; \ + case 4: __put_user_asm(x, , addr, __pu_ret); break; \ + case 8: __put_user_asm(x, d, addr, __pu_ret); break; \ + default: __pu_ret = __put_user_bad(); break; \ + } \ + __pu_ret; \ +}) + +#define __put_user_asm(x, size, addr, ret) \ __asm__ __volatile__( \ - "/* Put user asm, inline. */\n" \ -"1:\t" "st"#size " %1, %2\n\t" \ - "clr %0\n" \ -"2:\n\n\t" \ - ".section .fixup,#alloc,#execinstr\n\t" \ - ".align 4\n" \ -"3:\n\t" \ - "b 2b\n\t" \ - " mov %3, %0\n\t" \ - ".previous\n\n\t" \ - ".section __ex_table,#alloc\n\t" \ - ".align 4\n\t" \ - ".word 1b, 3b\n\t" \ - ".previous\n\n\t" \ - : "=&r" (ret) : "r" (x), "m" (*__m(addr)), \ - "i" (-EFAULT)) - -extern int __put_user_bad(void); - -#define __get_user_check(x,addr,size,type) ({ \ -register int __gu_ret; \ -register unsigned long __gu_val; \ -if (__access_ok(addr,size)) { \ -switch (size) { \ -case 1: __get_user_asm(__gu_val,ub,addr,__gu_ret); break; \ -case 2: __get_user_asm(__gu_val,uh,addr,__gu_ret); break; \ -case 4: __get_user_asm(__gu_val,,addr,__gu_ret); break; \ -case 8: __get_user_asm(__gu_val,d,addr,__gu_ret); break; \ -default: __gu_val = 0; __gu_ret = __get_user_bad(); break; \ -} } else { __gu_val = 0; __gu_ret = -EFAULT; } x = (type) __gu_val; __gu_ret; }) - -#define __get_user_check_ret(x,addr,size,type,retval) ({ \ -register unsigned long __gu_val __asm__ ("l1"); \ -if (__access_ok(addr,size)) { \ -switch (size) { \ -case 1: __get_user_asm_ret(__gu_val,ub,addr,retval); break; \ -case 2: __get_user_asm_ret(__gu_val,uh,addr,retval); break; \ -case 4: __get_user_asm_ret(__gu_val,,addr,retval); break; \ -case 8: __get_user_asm_ret(__gu_val,d,addr,retval); break; \ -default: if (__get_user_bad()) return retval; \ -} x = (type) __gu_val; } else return retval; }) - -#define __get_user_nocheck(x,addr,size,type) ({ \ -register int __gu_ret; \ -register unsigned long __gu_val; \ -switch (size) { \ -case 1: __get_user_asm(__gu_val,ub,addr,__gu_ret); break; \ -case 2: __get_user_asm(__gu_val,uh,addr,__gu_ret); break; \ -case 4: __get_user_asm(__gu_val,,addr,__gu_ret); break; \ -case 8: __get_user_asm(__gu_val,d,addr,__gu_ret); break; \ -default: __gu_val = 0; __gu_ret = __get_user_bad(); break; \ -} x = (type) __gu_val; __gu_ret; }) - -#define __get_user_nocheck_ret(x,addr,size,type,retval) ({ \ -register unsigned long __gu_val __asm__ ("l1"); \ -switch (size) { \ -case 1: __get_user_asm_ret(__gu_val,ub,addr,retval); break; \ -case 2: __get_user_asm_ret(__gu_val,uh,addr,retval); break; \ -case 4: __get_user_asm_ret(__gu_val,,addr,retval); break; \ -case 8: __get_user_asm_ret(__gu_val,d,addr,retval); break; \ -default: if (__get_user_bad()) return retval; \ -} x = (type) __gu_val; }) - -#define __get_user_asm(x,size,addr,ret) \ + "/* Put user asm, inline. */\n" \ + "1:\t" "st"#size " %1, %2\n\t" \ + "clr %0\n" \ + "2:\n\n\t" \ + ".section .fixup,#alloc,#execinstr\n\t" \ + ".align 4\n" \ + "3:\n\t" \ + "sethi %%hi(2b), %0\n\t" \ + "jmpl %0 + %%lo(2b), %%g0\n\t" \ + " mov %3, %0\n\t" \ + ".previous\n\n\t" \ + ".section __ex_table,#alloc\n\t" \ + ".align 4\n\t" \ + ".word 1b, 3b\n\t" \ + ".previous\n\n\t" \ + : "=&r" (ret) : "r" (x), "m" (*__m(addr)), \ + "i" (-EFAULT)) + +int __put_user_bad(void); + +#define __get_user_check(x, addr, size, type) ({ \ + register int __gu_ret; \ + register unsigned long __gu_val; \ + if (__access_ok(addr, size)) { \ + switch (size) { \ + case 1: \ + __get_user_asm(__gu_val, ub, addr, __gu_ret); \ + break; \ + case 2: \ + __get_user_asm(__gu_val, uh, addr, __gu_ret); \ + break; \ + case 4: \ + __get_user_asm(__gu_val, , addr, __gu_ret); \ + break; \ + case 8: \ + __get_user_asm(__gu_val, d, addr, __gu_ret); \ + break; \ + default: \ + __gu_val = 0; \ + __gu_ret = __get_user_bad(); \ + break; \ + } \ + } else { \ + __gu_val = 0; \ + __gu_ret = -EFAULT; \ + } \ + x = (__force type) __gu_val; \ + __gu_ret; \ +}) + +#define __get_user_nocheck(x, addr, size, type) ({ \ + register int __gu_ret; \ + register unsigned long __gu_val; \ + switch (size) { \ + case 1: __get_user_asm(__gu_val, ub, addr, __gu_ret); break; \ + case 2: __get_user_asm(__gu_val, uh, addr, __gu_ret); break; \ + case 4: __get_user_asm(__gu_val, , addr, __gu_ret); break; \ + case 8: __get_user_asm(__gu_val, d, addr, __gu_ret); break; \ + default: \ + __gu_val = 0; \ + __gu_ret = __get_user_bad(); \ + break; \ + } \ + x = (__force type) __gu_val; \ + __gu_ret; \ +}) + +#define __get_user_asm(x, size, addr, ret) \ __asm__ __volatile__( \ - "/* Get user asm, inline. */\n" \ -"1:\t" "ld"#size " %2, %1\n\t" \ - "clr %0\n" \ -"2:\n\n\t" \ - ".section .fixup,#alloc,#execinstr\n\t" \ - ".align 4\n" \ -"3:\n\t" \ - "clr %1\n\t" \ - "b 2b\n\t" \ - " mov %3, %0\n\n\t" \ - ".previous\n\t" \ - ".section __ex_table,#alloc\n\t" \ - ".align 4\n\t" \ - ".word 1b, 3b\n\n\t" \ - ".previous\n\t" \ - : "=&r" (ret), "=&r" (x) : "m" (*__m(addr)), \ - "i" (-EFAULT)) - -#define __get_user_asm_ret(x,size,addr,retval) \ -if (__builtin_constant_p(retval) && retval == -EFAULT) \ -__asm__ __volatile__( \ - "/* Get user asm ret, inline. */\n" \ -"1:\t" "ld"#size " %1, %0\n\n\t" \ - ".section __ex_table,#alloc\n\t" \ - ".align 4\n\t" \ - ".word 1b,__ret_efault\n\n\t" \ - ".previous\n\t" \ - : "=&r" (x) : "m" (*__m(addr))); \ -else \ -__asm__ __volatile__( \ - "/* Get user asm ret, inline. */\n" \ -"1:\t" "ld"#size " %1, %0\n\n\t" \ - ".section .fixup,#alloc,#execinstr\n\t" \ - ".align 4\n" \ -"3:\n\t" \ - "ret\n\t" \ - " restore %%g0, %2, %%o0\n\n\t" \ - ".previous\n\t" \ - ".section __ex_table,#alloc\n\t" \ - ".align 4\n\t" \ - ".word 1b, 3b\n\n\t" \ - ".previous\n\t" \ - : "=&r" (x) : "m" (*__m(addr)), "i" (retval)) - -extern int __get_user_bad(void); - -extern unsigned long __copy_user(void __user *to, const void __user *from, unsigned long size); - -static inline unsigned long copy_to_user(void __user *to, const void *from, unsigned long n) -{ - if (n && __access_ok((unsigned long) to, n)) - return __copy_user(to, (__force void __user *) from, n); - else - return n; -} - -static inline unsigned long __copy_to_user(void __user *to, const void *from, unsigned long n) + "/* Get user asm, inline. */\n" \ + "1:\t" "ld"#size " %2, %1\n\t" \ + "clr %0\n" \ + "2:\n\n\t" \ + ".section .fixup,#alloc,#execinstr\n\t" \ + ".align 4\n" \ + "3:\n\t" \ + "sethi %%hi(2b), %0\n\t" \ + "clr %1\n\t" \ + "jmpl %0 + %%lo(2b), %%g0\n\t" \ + " mov %3, %0\n\n\t" \ + ".previous\n\t" \ + ".section __ex_table,#alloc\n\t" \ + ".align 4\n\t" \ + ".word 1b, 3b\n\n\t" \ + ".previous\n\t" \ + : "=&r" (ret), "=&r" (x) : "m" (*__m(addr)), \ + "i" (-EFAULT)) + +int __get_user_bad(void); + +unsigned long __copy_user(void __user *to, const void __user *from, unsigned long size); + +static inline unsigned long raw_copy_to_user(void __user *to, const void *from, unsigned long n) { return __copy_user(to, (__force void __user *) from, n); } -static inline unsigned long copy_from_user(void *to, const void __user *from, unsigned long n) -{ - if (n && __access_ok((unsigned long) from, n)) - return __copy_user((__force void __user *) to, from, n); - else - return n; -} - -static inline unsigned long __copy_from_user(void *to, const void __user *from, unsigned long n) +static inline unsigned long raw_copy_from_user(void *to, const void __user *from, unsigned long n) { return __copy_user((__force void __user *) to, from, n); } -#define __copy_to_user_inatomic __copy_to_user -#define __copy_from_user_inatomic __copy_from_user +#define INLINE_COPY_FROM_USER +#define INLINE_COPY_TO_USER static inline unsigned long __clear_user(void __user *addr, unsigned long size) { unsigned long ret; __asm__ __volatile__ ( - ".section __ex_table,#alloc\n\t" - ".align 4\n\t" - ".word 1f,3\n\t" - ".previous\n\t" "mov %2, %%o1\n" - "1:\n\t" "call __bzero\n\t" " mov %1, %%o0\n\t" "mov %%o0, %0\n" @@ -300,15 +211,12 @@ static inline unsigned long __clear_user(void __user *addr, unsigned long size) static inline unsigned long clear_user(void __user *addr, unsigned long n) { - if (n && __access_ok((unsigned long) addr, n)) + if (n && __access_ok(addr, n)) return __clear_user(addr, n); else return n; } -extern __must_check long strlen_user(const char __user *str); -extern __must_check long strnlen_user(const char __user *str, long n); - -#endif /* __ASSEMBLY__ */ +__must_check long strnlen_user(const char __user *str, long n); #endif /* _ASM_UACCESS_H */ |