diff options
Diffstat (limited to 'include/asm-sparc/uaccess.h')
| -rw-r--r-- | include/asm-sparc/uaccess.h | 430 |
1 files changed, 282 insertions, 148 deletions
diff --git a/include/asm-sparc/uaccess.h b/include/asm-sparc/uaccess.h index 53eb75cae..4ffc23657 100644 --- a/include/asm-sparc/uaccess.h +++ b/include/asm-sparc/uaccess.h @@ -1,15 +1,17 @@ -/* $Id: uaccess.h,v 1.2 1996/10/31 00:59:56 davem Exp $ */ +/* $Id: uaccess.h,v 1.13 1997/04/11 00:42:22 davem Exp $ + * uaccess.h: User space memore access functions. + * + * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu) + * Copyright (C) 1996,1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz) + */ #ifndef _ASM_UACCESS_H #define _ASM_UACCESS_H -/* - * User space memory access functions - */ - #ifdef __KERNEL__ #include <linux/sched.h> #include <linux/string.h> #include <asm/vac-ops.h> +#include <asm/a.out.h> #endif #ifndef __ASSEMBLY__ @@ -20,7 +22,7 @@ * "For historical reasons, these macros are grossly misnamed." -Linus */ #define KERNEL_DS 0 -#define USER_DS 1 +#define USER_DS -1 #define VERIFY_READ 0 #define VERIFY_WRITE 1 @@ -29,9 +31,14 @@ #define get_ds() (KERNEL_DS) #define set_fs(val) ((current->tss.current_ds) = (val)) -#define __user_ok(addr,size) (((size) <= page_offset)&&((addr) <= page_offset-(size))) +/* 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) ((addr) < stack_top) #define __kernel_ok (get_fs() == KERNEL_DS) -#define __access_ok(addr,size) (__kernel_ok || __user_ok((addr),(size))) +#define __access_ok(addr,size) (__user_ok((addr) & get_fs(),(size))) #define access_ok(type,addr,size) __access_ok((unsigned long)(addr),(size)) extern inline int verify_area(int type, const void * addr, unsigned long size) @@ -39,6 +46,38 @@ extern inline int verify_area(int type, const void * addr, unsigned long size) return access_ok(type,addr,size)?0:-EFAULT; } +/* + * 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_exception_table(unsigned long, unsigned long *); + +extern void __ret_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.. @@ -52,200 +91,285 @@ extern inline int verify_area(int type, const void * addr, unsigned long size) unsigned long __pu_addr = (unsigned long)(ptr); \ __put_user_check((__typeof__(*(ptr)))(x),__pu_addr,sizeof(*(ptr))); }) +#define put_user_ret(x,ptr,retval) ({ \ +unsigned long __pu_addr = (unsigned long)(ptr); \ +__put_user_check_ret((__typeof__(*(ptr)))(x),__pu_addr,sizeof(*(ptr)),retval); }) + #define get_user(x,ptr) ({ \ unsigned long __gu_addr = (unsigned long)(ptr); \ __get_user_check((x),__gu_addr,sizeof(*(ptr)),__typeof__(*(ptr))); }) +#define get_user_ret(x,ptr,retval) ({ \ +unsigned long __gu_addr = (unsigned long)(ptr); \ +__get_user_check_ret((x),__gu_addr,sizeof(*(ptr)),__typeof__(*(ptr)),retval); }) + /* * 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((x),(ptr),sizeof(*(ptr))) +#define __put_user_ret(x,ptr,retval) __put_user_nocheck_ret((x),(ptr),sizeof(*(ptr)),retval) #define __get_user(x,ptr) __get_user_nocheck((x),(ptr),sizeof(*(ptr)),__typeof__(*(ptr))) +#define __get_user_ret(x,ptr,retval) __get_user_nocheck_ret((x),(ptr),sizeof(*(ptr)),__typeof__(*(ptr)),retval) struct __large_struct { unsigned long buf[100]; }; #define __m(x) ((struct __large_struct *)(x)) #define __put_user_check(x,addr,size) ({ \ -register int __pu_ret asm("g1"); \ -__pu_ret = -EFAULT; \ +register int __pu_ret; \ if (__access_ok(addr,size)) { \ switch (size) { \ -case 1: __put_user_8(x,addr,__pu_ret); break; \ -case 2: __put_user_16(x,addr,__pu_ret); break; \ -case 4: __put_user_32(x,addr,__pu_ret); break; \ +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; \ default: __pu_ret = __put_user_bad(); break; \ -} } __pu_ret; }) +} } else { __pu_ret = -EFAULT; } __pu_ret; }) + +#define __put_user_check_ret(x,addr,size,retval) ({ \ +register int __foo __asm__ ("l1"); \ +if (__access_ok(addr,size)) { \ +switch (size) { \ +case 1: __put_user_asm_ret(x,b,addr,retval,__foo); break; \ +case 2: __put_user_asm_ret(x,h,addr,retval,__foo); break; \ +case 4: __put_user_asm_ret(x,,addr,retval,__foo); break; \ +default: if (__put_user_bad()) return retval; break; \ +} } else return retval; }) #define __put_user_nocheck(x,addr,size) ({ \ -register int __pu_ret asm("g1"); \ -__pu_ret = -EFAULT; \ +register int __pu_ret; \ switch (size) { \ -case 1: __put_user_8(x,addr,__pu_ret); break; \ -case 2: __put_user_16(x,addr,__pu_ret); break; \ -case 4: __put_user_32(x,addr,__pu_ret); break; \ +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; \ default: __pu_ret = __put_user_bad(); break; \ } __pu_ret; }) -#define __put_user_8(x,addr,ret) \ -__asm__ __volatile( \ - "/* Put user 8, inline. */\n\t" \ - "ld [%%g6 + %3], %%g2\n\t" \ - "set 1f, %0\n\t" \ - "add %%g2, 1, %%g3\n\t" \ - "st %0, [%%g6 + %4]\n\t" \ - "st %%g3, [%%g6 + %3]\n\t" \ - "stb %1, [%2]\n\t" \ - "mov 0, %0\n\t" \ - "st %%g2, [%%g6 + %3]\n" \ -"1:\n" : "=&r" (ret) : "r" (x), "r" (__m(addr)), \ - "i" ((const unsigned long)(&((struct task_struct *)0)->tss.ex.count)), \ - "i" ((const unsigned long)(&((struct task_struct *)0)->tss.ex.expc)) \ - : "g2", "g3") - -#define __put_user_16(x,addr,ret) \ -__asm__ __volatile( \ - "/* Put user 16, inline. */\n\t" \ - "ld [%%g6 + %3], %%g2\n\t" \ - "set 1f, %0\n\t" \ - "add %%g2, 1, %%g3\n\t" \ - "st %0, [%%g6 + %4]\n\t" \ - "st %%g3, [%%g6 + %3]\n\t" \ - "sth %1, [%2]\n\t" \ - "mov 0, %0\n\t" \ - "st %%g2, [%%g6 + %3]\n" \ -"1:\n" : "=&r" (ret) : "r" (x), "r" (__m(addr)), \ - "i" ((const unsigned long)(&((struct task_struct *)0)->tss.ex.count)), \ - "i" ((const unsigned long)(&((struct task_struct *)0)->tss.ex.expc)) \ - : "g2", "g3") - -#define __put_user_32(x,addr,ret) \ -__asm__ __volatile( \ - "/* Put user 32, inline. */\n\t" \ - "ld [%%g6 + %3], %%g2\n\t" \ - "set 1f, %0\n\t" \ - "add %%g2, 1, %%g3\n\t" \ - "st %0, [%%g6 + %4]\n\t" \ - "st %%g3, [%%g6 + %3]\n\t" \ - "st %1, [%2]\n\t" \ - "mov 0, %0\n\t" \ - "st %%g2, [%%g6 + %3]\n" \ -"1:\n" : "=&r" (ret) : "r" (x), "r" (__m(addr)), \ - "i" ((const unsigned long)(&((struct task_struct *)0)->tss.ex.count)), \ - "i" ((const unsigned long)(&((struct task_struct *)0)->tss.ex.expc)) \ - : "g2", "g3") +#define __put_user_nocheck_ret(x,addr,size,retval) ({ \ +register int __foo __asm__ ("l1"); \ +switch (size) { \ +case 1: __put_user_asm_ret(x,b,addr,retval,__foo); break; \ +case 2: __put_user_asm_ret(x,h,addr,retval,__foo); break; \ +case 4: __put_user_asm_ret(x,,addr,retval,__foo); break; \ +default: if (__put_user_bad()) return retval; break; \ +} }) + +#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)) + +#define __put_user_asm_ret(x,size,addr,ret,foo) \ +if (__builtin_constant_p(ret) && ret == -EFAULT) \ +__asm__ __volatile__( \ + "/* Put user asm ret, inline. */\n" \ +"1:\t" "st"#size " %1, %2\n\n\t" \ + ".section __ex_table,#alloc\n\t" \ + ".align 4\n\t" \ + ".word 1b, __ret_efault\n\n\t" \ + ".previous\n\n\t" \ + : "=r" (foo) : "r" (x), "m" (*__m(addr))); \ +else \ +__asm__ __volatile( \ + "/* Put user asm ret, inline. */\n" \ +"1:\t" "st"#size " %1, %2\n\n\t" \ + ".section .fixup,#alloc,#execinstr\n\t" \ + ".align 4\n" \ +"3:\n\t" \ + "ret\n\t" \ + " restore %%g0, %3, %%o0\n\t" \ + ".previous\n\n\t" \ + ".section __ex_table,#alloc\n\t" \ + ".align 4\n\t" \ + ".word 1b, 3b\n\n\t" \ + ".previous\n\n\t" \ + : "=r" (foo) : "r" (x), "m" (*__m(addr)), "i" (ret)) extern int __put_user_bad(void); #define __get_user_check(x,addr,size,type) ({ \ -register int __gu_ret asm("g1"); \ -register unsigned long __gu_val = 0; \ -__gu_ret = -EFAULT; \ +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; \ +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_8(__gu_val,addr,__gu_ret); break; \ -case 2: __get_user_16(__gu_val,addr,__gu_ret); break; \ -case 4: __get_user_32(__gu_val,addr,__gu_ret); break; \ -default: __gu_ret = __get_user_bad(); break; \ -} } x = (type) __gu_val; __gu_ret; }) +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; \ +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 asm("g1"); \ -register unsigned long __gu_val = 0; \ -__gu_ret = -EFAULT; \ +register int __gu_ret; \ +register unsigned long __gu_val; \ switch (size) { \ -case 1: __get_user_8(__gu_val,addr,__gu_ret); break; \ -case 2: __get_user_16(__gu_val,addr,__gu_ret); break; \ -case 4: __get_user_32(__gu_val,addr,__gu_ret); break; \ -default: __gu_ret = __get_user_bad(); break; \ +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; \ +default: __gu_val = 0; __gu_ret = __get_user_bad(); break; \ } x = (type) __gu_val; __gu_ret; }) -#define __get_user_8(x,addr,ret) \ -__asm__ __volatile__( \ - "/* Get user 8, inline. */\n\t" \ - "ld [%%g6 + %3], %%g2\n\t" \ - "set 1f, %0\n\t" \ - "add %%g2, 1, %%g3\n\t" \ - "st %0, [%%g6 + %4]\n\t" \ - "st %%g3, [%%g6 + %3]\n\t" \ - "ldub [%2], %1\n\t" \ - "mov 0, %0\n\t" \ - "st %%g2, [%%g6 + %3]\n" \ -"1:\n" : "=&r" (ret), "=&r" (x) : "r" (__m(addr)), \ - "i" ((const unsigned long)(&((struct task_struct *)0)->tss.ex.count)), \ - "i" ((const unsigned long)(&((struct task_struct *)0)->tss.ex.expc)) \ - : "g2", "g3") - -#define __get_user_16(x,addr,ret) \ -__asm__ __volatile__( \ - "/* Get user 16, inline. */\n\t" \ - "ld [%%g6 + %3], %%g2\n\t" \ - "set 1f, %0\n\t" \ - "add %%g2, 1, %%g3\n\t" \ - "st %0, [%%g6 + %4]\n\t" \ - "st %%g3, [%%g6 + %3]\n\t" \ - "lduh [%2], %1\n\t" \ - "mov 0, %0\n\t" \ - "st %%g2, [%%g6 + %3]\n" \ -"1:\n" : "=&r" (ret), "=&r" (x) : "r" (__m(addr)), \ - "i" ((const unsigned long)(&((struct task_struct *)0)->tss.ex.count)), \ - "i" ((const unsigned long)(&((struct task_struct *)0)->tss.ex.expc)) \ - : "g2", "g3") - -#define __get_user_32(x,addr,ret) \ -__asm__ __volatile__( \ - "/* Get user 32, inline. */\n\t" \ - "ld [%%g6 + %3], %%g2\n\t" \ - "set 1f, %0\n\t" \ - "add %%g2, 1, %%g3\n\t" \ - "st %0, [%%g6 + %4]\n\t" \ - "st %%g3, [%%g6 + %3]\n\t" \ - "ld [%2], %1\n\t" \ - "mov 0, %0\n\t" \ - "st %%g2, [%%g6 + %3]\n" \ -"1:\n" : "=&r" (ret), "=&r" (x) : "r" (__m(addr)), \ - "i" ((const unsigned long)(&((struct task_struct *)0)->tss.ex.count)), \ - "i" ((const unsigned long)(&((struct task_struct *)0)->tss.ex.expc)) \ - : "g2", "g3") +#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; \ +default: if (__get_user_bad()) return retval; \ +} x = (type) __gu_val; }) + +#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 int __copy_to_user(unsigned long to, unsigned long from, int size); -extern int __copy_from_user(unsigned long to, unsigned long from, int size); +extern __kernel_size_t __copy_user(void *to, void *from, __kernel_size_t size); #define copy_to_user(to,from,n) ({ \ -unsigned long __copy_to = (unsigned long) (to); \ -unsigned long __copy_size = (unsigned long) (n); \ -unsigned long __copy_res; \ -if(__copy_size && __access_ok(__copy_to, __copy_size)) { \ -__copy_res = __copy_to_user(__copy_to, (unsigned long) (from), __copy_size); \ -if(__copy_res) __copy_res = __copy_size - __copy_res; \ +void *__copy_to = (void *) (to); \ +__kernel_size_t __copy_size = (__kernel_size_t) (n); \ +__kernel_size_t __copy_res; \ +if(__copy_size && __access_ok((unsigned long)__copy_to, __copy_size)) { \ +__copy_res = __copy_user(__copy_to, (void *) (from), __copy_size); \ } else __copy_res = __copy_size; \ __copy_res; }) +#define copy_to_user_ret(to,from,n,retval) ({ \ +if (copy_to_user(to,from,n)) \ + return retval; \ +}) + +#define __copy_to_user(to,from,n) \ + __copy_user((void *)(to), \ + (void *)(from), n) + +#define __copy_to_user_ret(to,from,n,retval) ({ \ +if (__copy_to_user(to,from,n)) \ + return retval; \ +}) + #define copy_from_user(to,from,n) ({ \ -unsigned long __copy_from = (unsigned long) (from); \ -unsigned long __copy_size = (unsigned long) (n); \ -unsigned long __copy_res; \ -if(__copy_size && __access_ok(__copy_from, __copy_size)) { \ -__copy_res = __copy_from_user((unsigned long) (to), __copy_from, __copy_size); \ -if(__copy_res) __copy_res = __copy_size - __copy_res; \ +void *__copy_from = (void *) (from); \ +__kernel_size_t __copy_size = (__kernel_size_t) (n); \ +__kernel_size_t __copy_res; \ +if(__copy_size && __access_ok((unsigned long)__copy_from, __copy_size)) { \ +__copy_res = __copy_user((void *) (to), __copy_from, __copy_size); \ } else __copy_res = __copy_size; \ __copy_res; }) -extern int __clear_user(unsigned long addr, int size); +#define copy_from_user_ret(to,from,n,retval) ({ \ +if (copy_from_user(to,from,n)) \ + return retval; \ +}) + +#define __copy_from_user(to,from,n) \ + __copy_user((void *)(to), \ + (void *)(from), n) + +#define __copy_from_user_ret(to,from,n,retval) ({ \ +if (__copy_from_user(to,from,n)) \ + return retval; \ +}) + +extern __inline__ __kernel_size_t __clear_user(void *addr, __kernel_size_t size) +{ + __kernel_size_t ret; + __asm__ __volatile__ (" + .section __ex_table,#alloc + .align 4 + .word 1f,3 + .previous +1: + mov %2, %%o1 + call __bzero + mov %1, %%o0 + mov %%o0, %0 + " : "=r" (ret) : "r" (addr), "r" (size) : + "o0", "o1", "o2", "o3", "o4", "o5", "o7", + "g1", "g2", "g3", "g4", "g5", "g7", "cc"); + return ret; +} #define clear_user(addr,n) ({ \ -unsigned long __clear_addr = (unsigned long) (addr); \ -int __clear_size = (int) (n); \ -int __clear_res; \ -if(__clear_size && __access_ok(__clear_addr, __clear_size)) { \ +void *__clear_addr = (void *) (addr); \ +__kernel_size_t __clear_size = (__kernel_size_t) (n); \ +__kernel_size_t __clear_res; \ +if(__clear_size && __access_ok((unsigned long)__clear_addr, __clear_size)) { \ __clear_res = __clear_user(__clear_addr, __clear_size); \ -if(__clear_res) __clear_res = __clear_size - __clear_res; \ } else __clear_res = __clear_size; \ __clear_res; }) +#define clear_user_ret(addr,size,retval) ({ \ +if (clear_user(addr,size)) \ + return retval; \ +}) + extern int __strncpy_from_user(unsigned long dest, unsigned long src, int count); #define strncpy_from_user(dest,src,count) ({ \ @@ -256,6 +380,16 @@ if(__access_ok(__sfu_src, __sfu_count)) { \ __sfu_res = __strncpy_from_user((unsigned long) (dest), __sfu_src, __sfu_count); \ } __sfu_res; }) +extern int __strlen_user(const char *); + +extern __inline__ int strlen_user(const char *str) +{ + if(!access_ok(VERIFY_READ, str, 0)) + return 0; + else + return __strlen_user(str); +} + #endif /* __ASSEMBLY__ */ #endif /* _ASM_UACCESS_H */ |