diff options
Diffstat (limited to 'include/asm-sparc/uaccess_64.h')
| -rw-r--r-- | include/asm-sparc/uaccess_64.h | 273 |
1 files changed, 273 insertions, 0 deletions
diff --git a/include/asm-sparc/uaccess_64.h b/include/asm-sparc/uaccess_64.h new file mode 100644 index 00000000000..296ef30e05c --- /dev/null +++ b/include/asm-sparc/uaccess_64.h @@ -0,0 +1,273 @@ +#ifndef _ASM_UACCESS_H +#define _ASM_UACCESS_H + +/* + * User space memory access functions + */ + +#ifdef __KERNEL__ +#include <linux/compiler.h> +#include <linux/sched.h> +#include <linux/string.h> +#include <asm/asi.h> +#include <asm/system.h> +#include <asm/spitfire.h> +#include <asm-generic/uaccess.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 */ |