| #ifndef __PARISC_UACCESS_H |
| #define __PARISC_UACCESS_H |
| |
| /* |
| * User space memory access functions |
| */ |
| #include <linux/sched.h> |
| #include <asm/page.h> |
| #include <asm/system.h> |
| #include <asm/cache.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->addr_limit) |
| #define set_fs(x) (current->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() or verify_area(). |
| * 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,addr,size) (1) |
| #define verify_area(type,addr,size) (0) |
| |
| #define put_user __put_user |
| #define get_user __get_user |
| |
| #if BITS_PER_LONG == 32 |
| #define LDD_KERNEL(ptr) BUG() |
| #define LDD_USER(ptr) BUG() |
| #define STD_KERNEL(x, ptr) __put_kernel_asm64(x,ptr) |
| #define STD_USER(x, ptr) __put_user_asm64(x,ptr) |
| #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) |
| #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 number of bytes to skip if a fault occurs. We also support in |
| * two bit flags: 0x2 tells the exception handler to clear register |
| * r9 and 0x1 tells the exception handler to put -EFAULT in r8. |
| * This allows us to handle the simple cases for put_user and |
| * get_user without having to have .fixup sections. |
| */ |
| |
| struct exception_table_entry { |
| unsigned long addr; /* address of insn that is allowed to fault. */ |
| long skip; /* pcoq skip | r9 clear flag | r8 -EFAULT flag */ |
| }; |
| |
| extern const struct exception_table_entry |
| *search_exception_table(unsigned long 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: BUG(); 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: BUG(); break; \ |
| } \ |
| } \ |
| \ |
| (x) = (__typeof__(*(ptr))) __gu_val; \ |
| __gu_err; \ |
| }) |
| |
| #ifdef __LP64__ |
| #define __get_kernel_asm(ldx,ptr) \ |
| __asm__("\n1:\t" ldx "\t0(%2),%0\n" \ |
| "2:\n" \ |
| "\t.section __ex_table,\"a\"\n" \ |
| "\t.dword\t1b\n" \ |
| "\t.dword\t(2b-1b)+3\n" \ |
| "\t.previous" \ |
| : "=r"(__gu_val), "=r"(__gu_err) \ |
| : "r"(ptr), "1"(__gu_err)); |
| |
| #define __get_user_asm(ldx,ptr) \ |
| __asm__("\n1:\t" ldx "\t0(%%sr3,%2),%0\n" \ |
| "2:\n" \ |
| "\t.section __ex_table,\"a\"\n" \ |
| "\t.dword\t1b\n" \ |
| "\t.dword\t(2b-1b)+3\n" \ |
| "\t.previous" \ |
| : "=r"(__gu_val), "=r"(__gu_err) \ |
| : "r"(ptr), "1"(__gu_err)); |
| #else |
| #define __get_kernel_asm(ldx,ptr) \ |
| __asm__("\n1:\t" ldx "\t0(%2),%0\n" \ |
| "2:\n" \ |
| "\t.section __ex_table,\"a\"\n" \ |
| "\t.word\t1b\n" \ |
| "\t.word\t(2b-1b)+3\n" \ |
| "\t.previous" \ |
| : "=r"(__gu_val), "=r"(__gu_err) \ |
| : "r"(ptr), "1"(__gu_err)); |
| |
| #define __get_user_asm(ldx,ptr) \ |
| __asm__("\n1:\t" ldx "\t0(%%sr3,%2),%0\n" \ |
| "2:\n" \ |
| "\t.section __ex_table,\"a\"\n" \ |
| "\t.word\t1b\n" \ |
| "\t.word\t(2b-1b)+3\n" \ |
| "\t.previous" \ |
| : "=r"(__gu_val), "=r"(__gu_err) \ |
| : "r"(ptr), "1"(__gu_err)); |
| #endif |
| |
| #define __put_user(x,ptr) \ |
| ({ \ |
| register long __pu_err __asm__ ("r8") = 0; \ |
| \ |
| 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: BUG(); 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: 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. |
| */ |
| |
| #ifdef __LP64__ |
| #define __put_kernel_asm(stx,x,ptr) \ |
| __asm__ __volatile__ ( \ |
| "\n1:\t" stx "\t%2,0(%1)\n" \ |
| "2:\n" \ |
| "\t.section __ex_table,\"a\"\n" \ |
| "\t.dword\t1b\n" \ |
| "\t.dword\t(2b-1b)+1\n" \ |
| "\t.previous" \ |
| : "=r"(__pu_err) \ |
| : "r"(ptr), "r"(x), "0"(__pu_err)) |
| |
| #define __put_user_asm(stx,x,ptr) \ |
| __asm__ __volatile__ ( \ |
| "\n1:\t" stx "\t%2,0(%%sr3,%1)\n" \ |
| "2:\n" \ |
| "\t.section __ex_table,\"a\"\n" \ |
| "\t.dword\t1b\n" \ |
| "\t.dword\t(2b-1b)+1\n" \ |
| "\t.previous" \ |
| : "=r"(__pu_err) \ |
| : "r"(ptr), "r"(x), "0"(__pu_err)) |
| #else |
| #define __put_kernel_asm(stx,x,ptr) \ |
| __asm__ __volatile__ ( \ |
| "\n1:\t" stx "\t%2,0(%1)\n" \ |
| "2:\n" \ |
| "\t.section __ex_table,\"a\"\n" \ |
| "\t.word\t1b\n" \ |
| "\t.word\t(2b-1b)+1\n" \ |
| "\t.previous" \ |
| : "=r"(__pu_err) \ |
| : "r"(ptr), "r"(x), "0"(__pu_err)) |
| |
| #define __put_user_asm(stx,x,ptr) \ |
| __asm__ __volatile__ ( \ |
| "\n1:\t" stx "\t%2,0(%%sr3,%1)\n" \ |
| "2:\n" \ |
| "\t.section __ex_table,\"a\"\n" \ |
| "\t.word\t1b\n" \ |
| "\t.word\t(2b-1b)+1\n" \ |
| "\t.previous" \ |
| : "=r"(__pu_err) \ |
| : "r"(ptr), "r"(x), "0"(__pu_err)) |
| |
| static inline void __put_kernel_asm64(u64 x, void *ptr) |
| { |
| u32 hi = x>>32; |
| u32 lo = x&0xffffffff; |
| __asm__ __volatile__ ( |
| "\n1:\tstw %1,0(%0)\n" |
| "\n2:\tstw %2,4(%0)\n" |
| "3:\n" |
| "\t.section __ex_table,\"a\"\n" |
| "\t.word\t1b\n" |
| "\t.word\t(3b-1b)+1\n" |
| "\t.word\t2b\n" |
| "\t.word\t(3b-2b)+1\n" |
| "\t.previous" |
| : : "r"(ptr), "r"(hi), "r"(lo)); |
| |
| } |
| |
| static inline void __put_user_asm64(u64 x, void *ptr) |
| { |
| u32 hi = x>>32; |
| u32 lo = x&0xffffffff; |
| __asm__ __volatile__ ( |
| "\n1:\tstw %1,0(%%sr3,%0)\n" |
| "\n2:\tstw %2,4(%%sr3,%0)\n" |
| "3:\n" |
| "\t.section __ex_table,\"a\"\n" |
| "\t.word\t1b\n" |
| "\t.word\t(3b-1b)+1\n" |
| "\t.word\t2b\n" |
| "\t.word\t(3b-2b)+1\n" |
| "\t.previous" |
| : : "r"(ptr), "r"(hi), "r"(lo)); |
| |
| } |
| |
| #endif |
| |
| |
| /* |
| * Complex access routines -- external declarations |
| */ |
| |
| extern unsigned long lcopy_to_user(void *, const void *, unsigned long); |
| extern unsigned long lcopy_from_user(void *, const void *, unsigned long); |
| extern long lstrncpy_from_user(char *, const char *, long); |
| extern unsigned lclear_user(void *,unsigned long); |
| extern long lstrnlen_user(const char *,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 |
| |
| #define copy_from_user lcopy_from_user |
| #define __copy_from_user lcopy_from_user |
| #define copy_to_user lcopy_to_user |
| #define __copy_to_user lcopy_to_user |
| |
| #endif /* __PARISC_UACCESS_H */ |
