| #ifndef _ASM_UACCESS_H |
| #define _ASM_UACCESS_H |
| |
| /* |
| * User space memory access functions |
| */ |
| |
| #ifdef __KERNEL__ |
| #include <linux/errno.h> |
| #include <linux/compiler.h> |
| #include <linux/string.h> |
| #include <linux/thread_info.h> |
| #include <asm/asi.h> |
| #include <asm/system.h> |
| #include <asm/spitfire.h> |
| #include <asm-generic/uaccess-unaligned.h> |
| #endif |
| |
| #ifndef __ASSEMBLY__ |
| |
| /* |
| * Sparc64 is segmented, though more like the M68K than the I386. |
| * We use the secondary ASI to address user memory, which references a |
| * completely different VM map, thus there is zero chance of the user |
| * doing something queer and tricking us into poking kernel memory. |
| * |
| * What is left here is basically what is needed for the other parts of |
| * the kernel that expect to be able to manipulate, erum, "segments". |
| * Or perhaps more properly, permissions. |
| * |
| * "For historical reasons, these macros are grossly misnamed." -Linus |
| */ |
| |
| #define KERNEL_DS ((mm_segment_t) { ASI_P }) |
| #define USER_DS ((mm_segment_t) { ASI_AIUS }) /* har har har */ |
| |
| #define VERIFY_READ 0 |
| #define VERIFY_WRITE 1 |
| |
| #define get_fs() ((mm_segment_t) { get_thread_current_ds() }) |
| #define get_ds() (KERNEL_DS) |
| |
| #define segment_eq(a,b) ((a).seg == (b).seg) |
| |
| #define set_fs(val) \ |
| do { \ |
| set_thread_current_ds((val).seg); \ |
| __asm__ __volatile__ ("wr %%g0, %0, %%asi" : : "r" ((val).seg)); \ |
| } while(0) |
| |
| static inline int __access_ok(const void __user * addr, unsigned long size) |
| { |
| return 1; |
| } |
| |
| static inline int access_ok(int type, const void __user * addr, unsigned long size) |
| { |
| return 1; |
| } |
| |
| /* |
| * 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. |
| */ |
| |
| struct exception_table_entry { |
| unsigned int insn, fixup; |
| }; |
| |
| extern void __ret_efault(void); |
| extern void __retl_efault(void); |
| |
| /* Uh, these should become the main single-value transfer routines.. |
| * They automatically use the right size if we just have the right |
| * pointer type.. |
| * |
| * This gets kind of ugly. We want to return _two_ values in "get_user()" |
| * and yet we don't want to do any pointers, because that is too much |
| * 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_nocheck((__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_nocheck((x),__gu_addr,sizeof(*(ptr)),__typeof__(*(ptr))); }) |
| |
| #define __put_user(x,ptr) put_user(x,ptr) |
| #define __get_user(x,ptr) get_user(x,ptr) |
| |
| struct __large_struct { unsigned long buf[100]; }; |
| #define __m(x) ((struct __large_struct *)(x)) |
| |
| #define __put_user_nocheck(data,addr,size) ({ \ |
| register int __pu_ret; \ |
| switch (size) { \ |
| case 1: __put_user_asm(data,b,addr,__pu_ret); break; \ |
| case 2: __put_user_asm(data,h,addr,__pu_ret); break; \ |
| case 4: __put_user_asm(data,w,addr,__pu_ret); break; \ |
| case 8: __put_user_asm(data,x,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 "a %1, [%2] %%asi\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\n\t" \ |
| ".previous\n\t" \ |
| ".section __ex_table,\"a\"\n\t" \ |
| ".align 4\n\t" \ |
| ".word 1b, 3b\n\t" \ |
| ".previous\n\n\t" \ |
| : "=r" (ret) : "r" (x), "r" (__m(addr)), \ |
| "i" (-EFAULT)) |
| |
| extern int __put_user_bad(void); |
| |
| #define __get_user_nocheck(data,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,uw,addr,__gu_ret); break; \ |
| case 8: __get_user_asm(__gu_val,x,addr,__gu_ret); break; \ |
| default: __gu_val = 0; __gu_ret = __get_user_bad(); break; \ |
| } data = (type) __gu_val; __gu_ret; }) |
| |
| #define __get_user_nocheck_ret(data,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,uw,addr,retval); break; \ |
| case 8: __get_user_asm_ret(__gu_val,x,addr,retval); break; \ |
| default: if (__get_user_bad()) return retval; \ |
| } data = (type) __gu_val; }) |
| |
| #define __get_user_asm(x,size,addr,ret) \ |
| __asm__ __volatile__( \ |
| "/* Get user asm, inline. */\n" \ |
| "1:\t" "ld"#size "a [%2] %%asi, %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,\"a\"\n\t" \ |
| ".align 4\n\t" \ |
| ".word 1b, 3b\n\n\t" \ |
| ".previous\n\t" \ |
| : "=r" (ret), "=r" (x) : "r" (__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 "a [%1] %%asi, %0\n\n\t" \ |
| ".section __ex_table,\"a\"\n\t" \ |
| ".align 4\n\t" \ |
| ".word 1b,__ret_efault\n\n\t" \ |
| ".previous\n\t" \ |
| : "=r" (x) : "r" (__m(addr))); \ |
| else \ |
| __asm__ __volatile__( \ |
| "/* Get user asm ret, inline. */\n" \ |
| "1:\t" "ld"#size "a [%1] %%asi, %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,\"a\"\n\t" \ |
| ".align 4\n\t" \ |
| ".word 1b, 3b\n\n\t" \ |
| ".previous\n\t" \ |
| : "=r" (x) : "r" (__m(addr)), "i" (retval)) |
| |
| extern int __get_user_bad(void); |
| |
| extern unsigned long __must_check ___copy_from_user(void *to, |
| const void __user *from, |
| unsigned long size); |
| extern unsigned long copy_from_user_fixup(void *to, const void __user *from, |
| unsigned long size); |
| static inline unsigned long __must_check |
| copy_from_user(void *to, const void __user *from, unsigned long size) |
| { |
| unsigned long ret = ___copy_from_user(to, from, size); |
| |
| if (unlikely(ret)) |
| ret = copy_from_user_fixup(to, from, size); |
| |
| return ret; |
| } |
| #define __copy_from_user copy_from_user |
| |
| extern unsigned long __must_check ___copy_to_user(void __user *to, |
| const void *from, |
| unsigned long size); |
| extern unsigned long copy_to_user_fixup(void __user *to, const void *from, |
| unsigned long size); |
| static inline unsigned long __must_check |
| copy_to_user(void __user *to, const void *from, unsigned long size) |
| { |
| unsigned long ret = ___copy_to_user(to, from, size); |
| |
| if (unlikely(ret)) |
| ret = copy_to_user_fixup(to, from, size); |
| return ret; |
| } |
| #define __copy_to_user copy_to_user |
| |
| extern unsigned long __must_check ___copy_in_user(void __user *to, |
| const void __user *from, |
| unsigned long size); |
| extern unsigned long copy_in_user_fixup(void __user *to, void __user *from, |
| unsigned long size); |
| static inline unsigned long __must_check |
| copy_in_user(void __user *to, void __user *from, unsigned long size) |
| { |
| unsigned long ret = ___copy_in_user(to, from, size); |
| |
| if (unlikely(ret)) |
| ret = copy_in_user_fixup(to, from, size); |
| return ret; |
| } |
| #define __copy_in_user copy_in_user |
| |
| extern unsigned long __must_check __clear_user(void __user *, unsigned long); |
| |
| #define clear_user __clear_user |
| |
| extern long __must_check __strncpy_from_user(char *dest, const char __user *src, long count); |
| |
| #define strncpy_from_user __strncpy_from_user |
| |
| extern long __strlen_user(const char __user *); |
| extern long __strnlen_user(const char __user *, long len); |
| |
| #define strlen_user __strlen_user |
| #define strnlen_user __strnlen_user |
| #define __copy_to_user_inatomic __copy_to_user |
| #define __copy_from_user_inatomic __copy_from_user |
| |
| #endif /* __ASSEMBLY__ */ |
| |
| #endif /* _ASM_UACCESS_H */ |