| #ifndef __PARISC_UACCESS_H |
| #define __PARISC_UACCESS_H |
| |
| /* |
| * User space memory access functions |
| */ |
| #include <asm/page.h> |
| #include <asm/system.h> |
| #include <asm/cache.h> |
| #include <asm-generic/uaccess.h> |
| |
| #define VERIFY_READ 0 |
| #define VERIFY_WRITE 1 |
| |
| #define KERNEL_DS ((mm_segment_t){0}) |
| #define USER_DS ((mm_segment_t){1}) |
| |
| #define segment_eq(a,b) ((a).seg == (b).seg) |
| |
| #define get_ds() (KERNEL_DS) |
| #define get_fs() (current_thread_info()->addr_limit) |
| #define set_fs(x) (current_thread_info()->addr_limit = (x)) |
| |
| /* |
| * Note that since kernel addresses are in a separate address space on |
| * parisc, we don't need to do anything for access_ok(). |
| * We just let the page fault handler do the right thing. This also means |
| * that put_user is the same as __put_user, etc. |
| */ |
| |
| extern int __get_kernel_bad(void); |
| extern int __get_user_bad(void); |
| extern int __put_kernel_bad(void); |
| extern int __put_user_bad(void); |
| |
| static inline long access_ok(int type, const void __user * addr, |
| unsigned long size) |
| { |
| return 1; |
| } |
| |
| #define put_user __put_user |
| #define get_user __get_user |
| |
| #if !defined(CONFIG_64BIT) |
| #define LDD_KERNEL(ptr) __get_kernel_bad(); |
| #define LDD_USER(ptr) __get_user_bad(); |
| #define STD_KERNEL(x, ptr) __put_kernel_asm64(x,ptr) |
| #define STD_USER(x, ptr) __put_user_asm64(x,ptr) |
| #define ASM_WORD_INSN ".word\t" |
| #else |
| #define LDD_KERNEL(ptr) __get_kernel_asm("ldd",ptr) |
| #define LDD_USER(ptr) __get_user_asm("ldd",ptr) |
| #define STD_KERNEL(x, ptr) __put_kernel_asm("std",x,ptr) |
| #define STD_USER(x, ptr) __put_user_asm("std",x,ptr) |
| #define ASM_WORD_INSN ".dword\t" |
| #endif |
| |
| /* |
| * The exception table contains two values: the first is an address |
| * for an instruction that is allowed to fault, and the second is |
| * the address to the fixup routine. |
| */ |
| |
| struct exception_table_entry { |
| unsigned long insn; /* address of insn that is allowed to fault. */ |
| long fixup; /* fixup routine */ |
| }; |
| |
| #define ASM_EXCEPTIONTABLE_ENTRY( fault_addr, except_addr )\ |
| ".section __ex_table,\"aw\"\n" \ |
| ASM_WORD_INSN #fault_addr ", " #except_addr "\n\t" \ |
| ".previous\n" |
| |
| /* |
| * The page fault handler stores, in a per-cpu area, the following information |
| * if a fixup routine is available. |
| */ |
| struct exception_data { |
| unsigned long fault_ip; |
| unsigned long fault_space; |
| unsigned long fault_addr; |
| }; |
| |
| #define __get_user(x,ptr) \ |
| ({ \ |
| register long __gu_err __asm__ ("r8") = 0; \ |
| register long __gu_val __asm__ ("r9") = 0; \ |
| \ |
| if (segment_eq(get_fs(),KERNEL_DS)) { \ |
| switch (sizeof(*(ptr))) { \ |
| case 1: __get_kernel_asm("ldb",ptr); break; \ |
| case 2: __get_kernel_asm("ldh",ptr); break; \ |
| case 4: __get_kernel_asm("ldw",ptr); break; \ |
| case 8: LDD_KERNEL(ptr); break; \ |
| default: __get_kernel_bad(); break; \ |
| } \ |
| } \ |
| else { \ |
| switch (sizeof(*(ptr))) { \ |
| case 1: __get_user_asm("ldb",ptr); break; \ |
| case 2: __get_user_asm("ldh",ptr); break; \ |
| case 4: __get_user_asm("ldw",ptr); break; \ |
| case 8: LDD_USER(ptr); break; \ |
| default: __get_user_bad(); break; \ |
| } \ |
| } \ |
| \ |
| (x) = (__typeof__(*(ptr))) __gu_val; \ |
| __gu_err; \ |
| }) |
| |
| #define __get_kernel_asm(ldx,ptr) \ |
| __asm__("\n1:\t" ldx "\t0(%2),%0\n\t" \ |
| ASM_EXCEPTIONTABLE_ENTRY(1b, fixup_get_user_skip_1)\ |
| : "=r"(__gu_val), "=r"(__gu_err) \ |
| : "r"(ptr), "1"(__gu_err) \ |
| : "r1"); |
| |
| #define __get_user_asm(ldx,ptr) \ |
| __asm__("\n1:\t" ldx "\t0(%%sr3,%2),%0\n\t" \ |
| ASM_EXCEPTIONTABLE_ENTRY(1b,fixup_get_user_skip_1)\ |
| : "=r"(__gu_val), "=r"(__gu_err) \ |
| : "r"(ptr), "1"(__gu_err) \ |
| : "r1"); |
| |
| #define __put_user(x,ptr) \ |
| ({ \ |
| register long __pu_err __asm__ ("r8") = 0; \ |
| __typeof__(*(ptr)) __x = (__typeof__(*(ptr)))(x); \ |
| \ |
| if (segment_eq(get_fs(),KERNEL_DS)) { \ |
| switch (sizeof(*(ptr))) { \ |
| case 1: __put_kernel_asm("stb",__x,ptr); break; \ |
| case 2: __put_kernel_asm("sth",__x,ptr); break; \ |
| case 4: __put_kernel_asm("stw",__x,ptr); break; \ |
| case 8: STD_KERNEL(__x,ptr); break; \ |
| default: __put_kernel_bad(); break; \ |
| } \ |
| } \ |
| else { \ |
| switch (sizeof(*(ptr))) { \ |
| case 1: __put_user_asm("stb",__x,ptr); break; \ |
| case 2: __put_user_asm("sth",__x,ptr); break; \ |
| case 4: __put_user_asm("stw",__x,ptr); break; \ |
| case 8: STD_USER(__x,ptr); break; \ |
| default: __put_user_bad(); break; \ |
| } \ |
| } \ |
| \ |
| __pu_err; \ |
| }) |
| |
| /* |
| * The "__put_user/kernel_asm()" 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. These macros must |
| * also be aware that "fixup_put_user_skip_[12]" are executed in the |
| * context of the fault, and any registers used there must be listed |
| * as clobbers. In this case only "r1" is used by the current routines. |
| * r8/r9 are already listed as err/val. |
| */ |
| |
| #define __put_kernel_asm(stx,x,ptr) \ |
| __asm__ __volatile__ ( \ |
| "\n1:\t" stx "\t%2,0(%1)\n\t" \ |
| ASM_EXCEPTIONTABLE_ENTRY(1b,fixup_put_user_skip_1)\ |
| : "=r"(__pu_err) \ |
| : "r"(ptr), "r"(x), "0"(__pu_err) \ |
| : "r1") |
| |
| #define __put_user_asm(stx,x,ptr) \ |
| __asm__ __volatile__ ( \ |
| "\n1:\t" stx "\t%2,0(%%sr3,%1)\n\t" \ |
| ASM_EXCEPTIONTABLE_ENTRY(1b,fixup_put_user_skip_1)\ |
| : "=r"(__pu_err) \ |
| : "r"(ptr), "r"(x), "0"(__pu_err) \ |
| : "r1") |
| |
| |
| #if !defined(CONFIG_64BIT) |
| |
| #define __put_kernel_asm64(__val,ptr) do { \ |
| u64 __val64 = (u64)(__val); \ |
| u32 hi = (__val64) >> 32; \ |
| u32 lo = (__val64) & 0xffffffff; \ |
| __asm__ __volatile__ ( \ |
| "\n1:\tstw %2,0(%1)" \ |
| "\n2:\tstw %3,4(%1)\n\t" \ |
| ASM_EXCEPTIONTABLE_ENTRY(1b,fixup_put_user_skip_2)\ |
| ASM_EXCEPTIONTABLE_ENTRY(2b,fixup_put_user_skip_1)\ |
| : "=r"(__pu_err) \ |
| : "r"(ptr), "r"(hi), "r"(lo), "0"(__pu_err) \ |
| : "r1"); \ |
| } while (0) |
| |
| #define __put_user_asm64(__val,ptr) do { \ |
| u64 __val64 = (u64)(__val); \ |
| u32 hi = (__val64) >> 32; \ |
| u32 lo = (__val64) & 0xffffffff; \ |
| __asm__ __volatile__ ( \ |
| "\n1:\tstw %2,0(%%sr3,%1)" \ |
| "\n2:\tstw %3,4(%%sr3,%1)\n\t" \ |
| ASM_EXCEPTIONTABLE_ENTRY(1b,fixup_put_user_skip_2)\ |
| ASM_EXCEPTIONTABLE_ENTRY(2b,fixup_put_user_skip_1)\ |
| : "=r"(__pu_err) \ |
| : "r"(ptr), "r"(hi), "r"(lo), "0"(__pu_err) \ |
| : "r1"); \ |
| } while (0) |
| |
| #endif /* !defined(CONFIG_64BIT) */ |
| |
| |
| /* |
| * Complex access routines -- external declarations |
| */ |
| |
| extern unsigned long lcopy_to_user(void __user *, const void *, unsigned long); |
| extern unsigned long lcopy_from_user(void *, const void __user *, unsigned long); |
| extern unsigned long lcopy_in_user(void __user *, const void __user *, unsigned long); |
| extern long lstrncpy_from_user(char *, const char __user *, long); |
| extern unsigned lclear_user(void __user *,unsigned long); |
| extern long lstrnlen_user(const char __user *,long); |
| |
| /* |
| * Complex access routines -- macros |
| */ |
| |
| #define strncpy_from_user lstrncpy_from_user |
| #define strnlen_user lstrnlen_user |
| #define strlen_user(str) lstrnlen_user(str, 0x7fffffffL) |
| #define clear_user lclear_user |
| #define __clear_user lclear_user |
| |
| unsigned long copy_to_user(void __user *dst, const void *src, unsigned long len); |
| #define __copy_to_user copy_to_user |
| unsigned long copy_from_user(void *dst, const void __user *src, unsigned long len); |
| #define __copy_from_user copy_from_user |
| unsigned long copy_in_user(void __user *dst, const void __user *src, unsigned long len); |
| #define __copy_in_user copy_in_user |
| #define __copy_to_user_inatomic __copy_to_user |
| #define __copy_from_user_inatomic __copy_from_user |
| |
| int fixup_exception(struct pt_regs *regs); |
| |
| #endif /* __PARISC_UACCESS_H */ |
