diff options
author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /include/asm-s390/uaccess.h |
Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'include/asm-s390/uaccess.h')
-rw-r--r-- | include/asm-s390/uaccess.h | 436 |
1 files changed, 436 insertions, 0 deletions
diff --git a/include/asm-s390/uaccess.h b/include/asm-s390/uaccess.h new file mode 100644 index 000000000000..a7f43a251f81 --- /dev/null +++ b/include/asm-s390/uaccess.h @@ -0,0 +1,436 @@ +/* + * include/asm-s390/uaccess.h + * + * S390 version + * Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation + * Author(s): Hartmut Penner (hp@de.ibm.com), + * Martin Schwidefsky (schwidefsky@de.ibm.com) + * + * Derived from "include/asm-i386/uaccess.h" + */ +#ifndef __S390_UACCESS_H +#define __S390_UACCESS_H + +/* + * User space memory access functions + */ +#include <linux/sched.h> +#include <linux/errno.h> + +#define VERIFY_READ 0 +#define VERIFY_WRITE 1 + + +/* + * The fs value determines whether argument validity checking should be + * performed or not. If get_fs() == USER_DS, checking is performed, with + * get_fs() == KERNEL_DS, checking is bypassed. + * + * For historical reasons, these macros are grossly misnamed. + */ + +#define MAKE_MM_SEG(a) ((mm_segment_t) { (a) }) + + +#define KERNEL_DS MAKE_MM_SEG(0) +#define USER_DS MAKE_MM_SEG(1) + +#define get_ds() (KERNEL_DS) +#define get_fs() (current->thread.mm_segment) + +#ifdef __s390x__ +#define set_fs(x) \ +({ \ + unsigned long __pto; \ + current->thread.mm_segment = (x); \ + __pto = current->thread.mm_segment.ar4 ? \ + S390_lowcore.user_asce : S390_lowcore.kernel_asce; \ + asm volatile ("lctlg 7,7,%0" : : "m" (__pto) ); \ +}) +#else +#define set_fs(x) \ +({ \ + unsigned long __pto; \ + current->thread.mm_segment = (x); \ + __pto = current->thread.mm_segment.ar4 ? \ + S390_lowcore.user_asce : S390_lowcore.kernel_asce; \ + asm volatile ("lctl 7,7,%0" : : "m" (__pto) ); \ +}) +#endif + +#define segment_eq(a,b) ((a).ar4 == (b).ar4) + + +#define __access_ok(addr,size) (1) + +#define access_ok(type,addr,size) __access_ok(addr,size) + +/* this function will go away soon - use access_ok() instead */ +extern inline int __deprecated verify_area(int type, const void __user *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. + */ + +struct exception_table_entry +{ + unsigned long insn, fixup; +}; + +#ifndef __s390x__ +#define __uaccess_fixup \ + ".section .fixup,\"ax\"\n" \ + "2: lhi %0,%4\n" \ + " bras 1,3f\n" \ + " .long 1b\n" \ + "3: l 1,0(1)\n" \ + " br 1\n" \ + ".previous\n" \ + ".section __ex_table,\"a\"\n" \ + " .align 4\n" \ + " .long 0b,2b\n" \ + ".previous" +#define __uaccess_clobber "cc", "1" +#else /* __s390x__ */ +#define __uaccess_fixup \ + ".section .fixup,\"ax\"\n" \ + "2: lghi %0,%4\n" \ + " jg 1b\n" \ + ".previous\n" \ + ".section __ex_table,\"a\"\n" \ + " .align 8\n" \ + " .quad 0b,2b\n" \ + ".previous" +#define __uaccess_clobber "cc" +#endif /* __s390x__ */ + +/* + * These are the main single-value transfer routines. They automatically + * use the right size if we just have the right pointer type. + */ +#if __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ > 2) +#define __put_user_asm(x, ptr, err) \ +({ \ + err = 0; \ + asm volatile( \ + "0: mvcs 0(%1,%2),%3,%0\n" \ + "1:\n" \ + __uaccess_fixup \ + : "+&d" (err) \ + : "d" (sizeof(*(ptr))), "a" (ptr), "Q" (x), \ + "K" (-EFAULT) \ + : __uaccess_clobber ); \ +}) +#else +#define __put_user_asm(x, ptr, err) \ +({ \ + err = 0; \ + asm volatile( \ + "0: mvcs 0(%1,%2),0(%3),%0\n" \ + "1:\n" \ + __uaccess_fixup \ + : "+&d" (err) \ + : "d" (sizeof(*(ptr))), "a" (ptr), "a" (&(x)), \ + "K" (-EFAULT), "m" (x) \ + : __uaccess_clobber ); \ +}) +#endif + +#ifndef __CHECKER__ +#define __put_user(x, ptr) \ +({ \ + __typeof__(*(ptr)) __x = (x); \ + int __pu_err; \ + switch (sizeof (*(ptr))) { \ + case 1: \ + case 2: \ + case 4: \ + case 8: \ + __put_user_asm(__x, ptr, __pu_err); \ + break; \ + default: \ + __put_user_bad(); \ + break; \ + } \ + __pu_err; \ +}) +#else +#define __put_user(x, ptr) \ +({ \ + void __user *p; \ + p = (ptr); \ + 0; \ +}) +#endif + +#define put_user(x, ptr) \ +({ \ + might_sleep(); \ + __put_user(x, ptr); \ +}) + + +extern int __put_user_bad(void) __attribute__((noreturn)); + +#if __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ > 2) +#define __get_user_asm(x, ptr, err) \ +({ \ + err = 0; \ + asm volatile ( \ + "0: mvcp %O1(%2,%R1),0(%3),%0\n" \ + "1:\n" \ + __uaccess_fixup \ + : "+&d" (err), "=Q" (x) \ + : "d" (sizeof(*(ptr))), "a" (ptr), \ + "K" (-EFAULT) \ + : __uaccess_clobber ); \ +}) +#else +#define __get_user_asm(x, ptr, err) \ +({ \ + err = 0; \ + asm volatile ( \ + "0: mvcp 0(%2,%5),0(%3),%0\n" \ + "1:\n" \ + __uaccess_fixup \ + : "+&d" (err), "=m" (x) \ + : "d" (sizeof(*(ptr))), "a" (ptr), \ + "K" (-EFAULT), "a" (&(x)) \ + : __uaccess_clobber ); \ +}) +#endif + +#ifndef __CHECKER__ +#define __get_user(x, ptr) \ +({ \ + __typeof__(*(ptr)) __x; \ + int __gu_err; \ + switch (sizeof(*(ptr))) { \ + case 1: \ + case 2: \ + case 4: \ + case 8: \ + __get_user_asm(__x, ptr, __gu_err); \ + break; \ + default: \ + __get_user_bad(); \ + break; \ + } \ + (x) = __x; \ + __gu_err; \ +}) +#else +#define __get_user(x, ptr) \ +({ \ + void __user *p; \ + p = (ptr); \ + 0; \ +}) +#endif + + +#define get_user(x, ptr) \ +({ \ + might_sleep(); \ + __get_user(x, ptr); \ +}) + +extern int __get_user_bad(void) __attribute__((noreturn)); + +#define __put_user_unaligned __put_user +#define __get_user_unaligned __get_user + +extern long __copy_to_user_asm(const void *from, long n, void __user *to); + +/** + * __copy_to_user: - Copy a block of data into user space, with less checking. + * @to: Destination address, in user space. + * @from: Source address, in kernel space. + * @n: Number of bytes to copy. + * + * Context: User context only. This function may sleep. + * + * Copy data from kernel space to user space. Caller must check + * the specified block with access_ok() before calling this function. + * + * Returns number of bytes that could not be copied. + * On success, this will be zero. + */ +static inline unsigned long +__copy_to_user(void __user *to, const void *from, unsigned long n) +{ + return __copy_to_user_asm(from, n, to); +} + +#define __copy_to_user_inatomic __copy_to_user +#define __copy_from_user_inatomic __copy_from_user + +/** + * copy_to_user: - Copy a block of data into user space. + * @to: Destination address, in user space. + * @from: Source address, in kernel space. + * @n: Number of bytes to copy. + * + * Context: User context only. This function may sleep. + * + * Copy data from kernel space to user space. + * + * Returns number of bytes that could not be copied. + * On success, this will be zero. + */ +static inline unsigned long +copy_to_user(void __user *to, const void *from, unsigned long n) +{ + might_sleep(); + if (access_ok(VERIFY_WRITE, to, n)) + n = __copy_to_user(to, from, n); + return n; +} + +extern long __copy_from_user_asm(void *to, long n, const void __user *from); + +/** + * __copy_from_user: - Copy a block of data from user space, with less checking. + * @to: Destination address, in kernel space. + * @from: Source address, in user space. + * @n: Number of bytes to copy. + * + * Context: User context only. This function may sleep. + * + * Copy data from user space to kernel space. Caller must check + * the specified block with access_ok() before calling this function. + * + * Returns number of bytes that could not be copied. + * On success, this will be zero. + * + * If some data could not be copied, this function will pad the copied + * data to the requested size using zero bytes. + */ +static inline unsigned long +__copy_from_user(void *to, const void __user *from, unsigned long n) +{ + return __copy_from_user_asm(to, n, from); +} + +/** + * copy_from_user: - Copy a block of data from user space. + * @to: Destination address, in kernel space. + * @from: Source address, in user space. + * @n: Number of bytes to copy. + * + * Context: User context only. This function may sleep. + * + * Copy data from user space to kernel space. + * + * Returns number of bytes that could not be copied. + * On success, this will be zero. + * + * If some data could not be copied, this function will pad the copied + * data to the requested size using zero bytes. + */ +static inline unsigned long +copy_from_user(void *to, const void __user *from, unsigned long n) +{ + might_sleep(); + if (access_ok(VERIFY_READ, from, n)) + n = __copy_from_user(to, from, n); + else + memset(to, 0, n); + return n; +} + +extern unsigned long __copy_in_user_asm(const void __user *from, long n, + void __user *to); + +static inline unsigned long +__copy_in_user(void __user *to, const void __user *from, unsigned long n) +{ + return __copy_in_user_asm(from, n, to); +} + +static inline unsigned long +copy_in_user(void __user *to, const void __user *from, unsigned long n) +{ + might_sleep(); + if (__access_ok(from,n) && __access_ok(to,n)) + n = __copy_in_user_asm(from, n, to); + return n; +} + +/* + * Copy a null terminated string from userspace. + */ +extern long __strncpy_from_user_asm(long count, char *dst, + const char __user *src); + +static inline long +strncpy_from_user(char *dst, const char __user *src, long count) +{ + long res = -EFAULT; + might_sleep(); + if (access_ok(VERIFY_READ, src, 1)) + res = __strncpy_from_user_asm(count, dst, src); + return res; +} + + +extern long __strnlen_user_asm(long count, const char __user *src); + +static inline unsigned long +strnlen_user(const char __user * src, unsigned long n) +{ + might_sleep(); + return __strnlen_user_asm(n, src); +} + +/** + * strlen_user: - Get the size of a string in user space. + * @str: The string to measure. + * + * Context: User context only. This function may sleep. + * + * Get the size of a NUL-terminated string in user space. + * + * Returns the size of the string INCLUDING the terminating NUL. + * On exception, returns 0. + * + * If there is a limit on the length of a valid string, you may wish to + * consider using strnlen_user() instead. + */ +#define strlen_user(str) strnlen_user(str, ~0UL) + +/* + * Zero Userspace + */ + +extern long __clear_user_asm(void __user *to, long n); + +static inline unsigned long +__clear_user(void __user *to, unsigned long n) +{ + return __clear_user_asm(to, n); +} + +static inline unsigned long +clear_user(void __user *to, unsigned long n) +{ + might_sleep(); + if (access_ok(VERIFY_WRITE, to, n)) + n = __clear_user_asm(to, n); + return n; +} + +#endif /* __S390_UACCESS_H */ |