| #ifndef __PARISC_UACCESS_H |
| #define __PARISC_UACCESS_H |
| |
| /* |
| * User space memory access functions |
| */ |
| #include <asm/page.h> |
| #include <asm/cache.h> |
| #include <asm/errno.h> |
| #include <asm-generic/uaccess-unaligned.h> |
| |
| #include <linux/bug.h> |
| #include <linux/string.h> |
| #include <linux/thread_info.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. |
| */ |
| |
| #define access_ok(type, uaddr, size) \ |
| ( (uaddr) == (uaddr) ) |
| |
| #define put_user __put_user |
| #define get_user __get_user |
| |
| #if !defined(CONFIG_64BIT) |
| #define LDD_USER(ptr) __get_user_asm64(ptr) |
| #define STD_USER(x, ptr) __put_user_asm64(x, ptr) |
| #else |
| #define LDD_USER(ptr) __get_user_asm("ldd", ptr) |
| #define STD_USER(x, ptr) __put_user_asm("std", x, ptr) |
| #endif |
| |
| /* |
| * The exception table contains two values: the first is the relative offset to |
| * the address of the instruction that is allowed to fault, and the second is |
| * the relative offset to the address of the fixup routine. Since relative |
| * addresses are used, 32bit values are sufficient even on 64bit kernel. |
| */ |
| |
| #define ARCH_HAS_RELATIVE_EXTABLE |
| struct exception_table_entry { |
| int insn; /* relative address of insn that is allowed to fault. */ |
| int fixup; /* relative address of fixup routine */ |
| }; |
| |
| #define ASM_EXCEPTIONTABLE_ENTRY( fault_addr, except_addr )\ |
| ".section __ex_table,\"aw\"\n" \ |
| ".word (" #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_gp; |
| unsigned long fault_space; |
| unsigned long fault_addr; |
| }; |
| |
| /* |
| * load_sr2() preloads the space register %%sr2 - based on the value of |
| * get_fs() - with either a value of 0 to access kernel space (KERNEL_DS which |
| * is 0), or with the current value of %%sr3 to access user space (USER_DS) |
| * memory. The following __get_user_asm() and __put_user_asm() functions have |
| * %%sr2 hard-coded to access the requested memory. |
| */ |
| #define load_sr2() \ |
| __asm__(" or,= %0,%%r0,%%r0\n\t" \ |
| " mfsp %%sr3,%0\n\t" \ |
| " mtsp %0,%%sr2\n\t" \ |
| : : "r"(get_fs()) : ) |
| |
| #define __get_user(x, ptr) \ |
| ({ \ |
| register long __gu_err __asm__ ("r8") = 0; \ |
| register long __gu_val __asm__ ("r9") = 0; \ |
| \ |
| load_sr2(); \ |
| 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: BUILD_BUG(); break; \ |
| } \ |
| \ |
| (x) = (__force __typeof__(*(ptr))) __gu_val; \ |
| __gu_err; \ |
| }) |
| |
| #define __get_user_asm(ldx, ptr) \ |
| __asm__("\n1:\t" ldx "\t0(%%sr2,%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"); |
| |
| #if !defined(CONFIG_64BIT) |
| |
| #define __get_user_asm64(ptr) \ |
| __asm__("\n1:\tldw 0(%%sr2,%2),%0" \ |
| "\n2:\tldw 4(%%sr2,%2),%R0\n\t" \ |
| ASM_EXCEPTIONTABLE_ENTRY(1b, fixup_get_user_skip_2)\ |
| ASM_EXCEPTIONTABLE_ENTRY(2b, fixup_get_user_skip_1)\ |
| : "=r"(__gu_val), "=r"(__gu_err) \ |
| : "r"(ptr), "1"(__gu_err) \ |
| : "r1"); |
| |
| #endif /* !defined(CONFIG_64BIT) */ |
| |
| |
| #define __put_user(x, ptr) \ |
| ({ \ |
| register long __pu_err __asm__ ("r8") = 0; \ |
| __typeof__(*(ptr)) __x = (__typeof__(*(ptr)))(x); \ |
| \ |
| load_sr2(); \ |
| 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: BUILD_BUG(); 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_user_asm(stx, x, ptr) \ |
| __asm__ __volatile__ ( \ |
| "\n1:\t" stx "\t%2,0(%%sr2,%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_user_asm64(__val, ptr) do { \ |
| __asm__ __volatile__ ( \ |
| "\n1:\tstw %2,0(%%sr2,%1)" \ |
| "\n2:\tstw %R2,4(%%sr2,%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"(__val), "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 strncpy_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 user_addr_max() (~0UL) |
| |
| #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 __must_check __copy_to_user(void __user *dst, const void *src, |
| unsigned long len); |
| unsigned long __must_check __copy_from_user(void *dst, const void __user *src, |
| unsigned long len); |
| 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 |
| |
| extern void __compiletime_error("usercopy buffer size is too small") |
| __bad_copy_user(void); |
| |
| static inline void copy_user_overflow(int size, unsigned long count) |
| { |
| WARN(1, "Buffer overflow detected (%d < %lu)!\n", size, count); |
| } |
| |
| static __always_inline unsigned long __must_check |
| copy_from_user(void *to, const void __user *from, unsigned long n) |
| { |
| int sz = __compiletime_object_size(to); |
| unsigned long ret = n; |
| |
| if (likely(sz < 0 || sz >= n)) { |
| check_object_size(to, n, false); |
| ret = __copy_from_user(to, from, n); |
| } else if (!__builtin_constant_p(n)) |
| copy_user_overflow(sz, n); |
| else |
| __bad_copy_user(); |
| |
| if (unlikely(ret)) |
| memset(to + (n - ret), 0, ret); |
| |
| return ret; |
| } |
| |
| static __always_inline unsigned long __must_check |
| copy_to_user(void __user *to, const void *from, unsigned long n) |
| { |
| int sz = __compiletime_object_size(from); |
| |
| if (likely(sz < 0 || sz >= n)) { |
| check_object_size(from, n, true); |
| n = __copy_to_user(to, from, n); |
| } else if (!__builtin_constant_p(n)) |
| copy_user_overflow(sz, n); |
| else |
| __bad_copy_user(); |
| |
| return n; |
| } |
| |
| struct pt_regs; |
| int fixup_exception(struct pt_regs *regs); |
| |
| #endif /* __PARISC_UACCESS_H */ |