diff options
Diffstat (limited to 'arch/x86/lib/usercopy_32.c')
| -rw-r--r-- | arch/x86/lib/usercopy_32.c | 358 |
1 files changed, 105 insertions, 253 deletions
diff --git a/arch/x86/lib/usercopy_32.c b/arch/x86/lib/usercopy_32.c index d9b094ca7aaa..1781b2f950e2 100644 --- a/arch/x86/lib/usercopy_32.c +++ b/arch/x86/lib/usercopy_32.c @@ -13,6 +13,7 @@ #include <linux/interrupt.h> #include <asm/uaccess.h> #include <asm/mmx.h> +#include <asm/asm.h> #ifdef CONFIG_X86_INTEL_USERCOPY /* @@ -33,93 +34,6 @@ static inline int __movsl_is_ok(unsigned long a1, unsigned long a2, unsigned lon __movsl_is_ok((unsigned long)(a1), (unsigned long)(a2), (n)) /* - * Copy a null terminated string from userspace. - */ - -#define __do_strncpy_from_user(dst, src, count, res) \ -do { \ - int __d0, __d1, __d2; \ - might_fault(); \ - __asm__ __volatile__( \ - " testl %1,%1\n" \ - " jz 2f\n" \ - "0: lodsb\n" \ - " stosb\n" \ - " testb %%al,%%al\n" \ - " jz 1f\n" \ - " decl %1\n" \ - " jnz 0b\n" \ - "1: subl %1,%0\n" \ - "2:\n" \ - ".section .fixup,\"ax\"\n" \ - "3: movl %5,%0\n" \ - " jmp 2b\n" \ - ".previous\n" \ - _ASM_EXTABLE(0b,3b) \ - : "=&d"(res), "=&c"(count), "=&a" (__d0), "=&S" (__d1), \ - "=&D" (__d2) \ - : "i"(-EFAULT), "0"(count), "1"(count), "3"(src), "4"(dst) \ - : "memory"); \ -} while (0) - -/** - * __strncpy_from_user: - Copy a NUL terminated string from userspace, with less checking. - * @dst: Destination address, in kernel space. This buffer must be at - * least @count bytes long. - * @src: Source address, in user space. - * @count: Maximum number of bytes to copy, including the trailing NUL. - * - * Copies a NUL-terminated string from userspace to kernel space. - * Caller must check the specified block with access_ok() before calling - * this function. - * - * On success, returns the length of the string (not including the trailing - * NUL). - * - * If access to userspace fails, returns -EFAULT (some data may have been - * copied). - * - * If @count is smaller than the length of the string, copies @count bytes - * and returns @count. - */ -long -__strncpy_from_user(char *dst, const char __user *src, long count) -{ - long res; - __do_strncpy_from_user(dst, src, count, res); - return res; -} -EXPORT_SYMBOL(__strncpy_from_user); - -/** - * strncpy_from_user: - Copy a NUL terminated string from userspace. - * @dst: Destination address, in kernel space. This buffer must be at - * least @count bytes long. - * @src: Source address, in user space. - * @count: Maximum number of bytes to copy, including the trailing NUL. - * - * Copies a NUL-terminated string from userspace to kernel space. - * - * On success, returns the length of the string (not including the trailing - * NUL). - * - * If access to userspace fails, returns -EFAULT (some data may have been - * copied). - * - * If @count is smaller than the length of the string, copies @count bytes - * and returns @count. - */ -long -strncpy_from_user(char *dst, const char __user *src, long count) -{ - long res = -EFAULT; - if (access_ok(VERIFY_READ, src, 1)) - __do_strncpy_from_user(dst, src, count, res); - return res; -} -EXPORT_SYMBOL(strncpy_from_user); - -/* * Zero Userspace */ @@ -181,50 +95,6 @@ __clear_user(void __user *to, unsigned long n) } EXPORT_SYMBOL(__clear_user); -/** - * strnlen_user: - Get the size of a string in user space. - * @s: The string to measure. - * @n: The maximum valid length - * - * 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 the string is too long, returns a value greater than @n. - */ -long strnlen_user(const char __user *s, long n) -{ - unsigned long mask = -__addr_ok(s); - unsigned long res, tmp; - - might_fault(); - - __asm__ __volatile__( - " testl %0, %0\n" - " jz 3f\n" - " andl %0,%%ecx\n" - "0: repne; scasb\n" - " setne %%al\n" - " subl %%ecx,%0\n" - " addl %0,%%eax\n" - "1:\n" - ".section .fixup,\"ax\"\n" - "2: xorl %%eax,%%eax\n" - " jmp 1b\n" - "3: movb $1,%%al\n" - " jmp 1b\n" - ".previous\n" - ".section __ex_table,\"a\"\n" - " .align 4\n" - " .long 0b,2b\n" - ".previous" - :"=&r" (n), "=&D" (s), "=&a" (res), "=&c" (tmp) - :"0" (n), "1" (s), "2" (0), "3" (mask) - :"cc"); - return res & mask; -} -EXPORT_SYMBOL(strnlen_user); - #ifdef CONFIG_X86_INTEL_USERCOPY static unsigned long __copy_user_intel(void __user *to, const void *from, unsigned long size) @@ -286,47 +156,44 @@ __copy_user_intel(void __user *to, const void *from, unsigned long size) "101: lea 0(%%eax,%0,4),%0\n" " jmp 100b\n" ".previous\n" - ".section __ex_table,\"a\"\n" - " .align 4\n" - " .long 1b,100b\n" - " .long 2b,100b\n" - " .long 3b,100b\n" - " .long 4b,100b\n" - " .long 5b,100b\n" - " .long 6b,100b\n" - " .long 7b,100b\n" - " .long 8b,100b\n" - " .long 9b,100b\n" - " .long 10b,100b\n" - " .long 11b,100b\n" - " .long 12b,100b\n" - " .long 13b,100b\n" - " .long 14b,100b\n" - " .long 15b,100b\n" - " .long 16b,100b\n" - " .long 17b,100b\n" - " .long 18b,100b\n" - " .long 19b,100b\n" - " .long 20b,100b\n" - " .long 21b,100b\n" - " .long 22b,100b\n" - " .long 23b,100b\n" - " .long 24b,100b\n" - " .long 25b,100b\n" - " .long 26b,100b\n" - " .long 27b,100b\n" - " .long 28b,100b\n" - " .long 29b,100b\n" - " .long 30b,100b\n" - " .long 31b,100b\n" - " .long 32b,100b\n" - " .long 33b,100b\n" - " .long 34b,100b\n" - " .long 35b,100b\n" - " .long 36b,100b\n" - " .long 37b,100b\n" - " .long 99b,101b\n" - ".previous" + _ASM_EXTABLE(1b,100b) + _ASM_EXTABLE(2b,100b) + _ASM_EXTABLE(3b,100b) + _ASM_EXTABLE(4b,100b) + _ASM_EXTABLE(5b,100b) + _ASM_EXTABLE(6b,100b) + _ASM_EXTABLE(7b,100b) + _ASM_EXTABLE(8b,100b) + _ASM_EXTABLE(9b,100b) + _ASM_EXTABLE(10b,100b) + _ASM_EXTABLE(11b,100b) + _ASM_EXTABLE(12b,100b) + _ASM_EXTABLE(13b,100b) + _ASM_EXTABLE(14b,100b) + _ASM_EXTABLE(15b,100b) + _ASM_EXTABLE(16b,100b) + _ASM_EXTABLE(17b,100b) + _ASM_EXTABLE(18b,100b) + _ASM_EXTABLE(19b,100b) + _ASM_EXTABLE(20b,100b) + _ASM_EXTABLE(21b,100b) + _ASM_EXTABLE(22b,100b) + _ASM_EXTABLE(23b,100b) + _ASM_EXTABLE(24b,100b) + _ASM_EXTABLE(25b,100b) + _ASM_EXTABLE(26b,100b) + _ASM_EXTABLE(27b,100b) + _ASM_EXTABLE(28b,100b) + _ASM_EXTABLE(29b,100b) + _ASM_EXTABLE(30b,100b) + _ASM_EXTABLE(31b,100b) + _ASM_EXTABLE(32b,100b) + _ASM_EXTABLE(33b,100b) + _ASM_EXTABLE(34b,100b) + _ASM_EXTABLE(35b,100b) + _ASM_EXTABLE(36b,100b) + _ASM_EXTABLE(37b,100b) + _ASM_EXTABLE(99b,101b) : "=&c"(size), "=&D" (d0), "=&S" (d1) : "1"(to), "2"(from), "0"(size) : "eax", "edx", "memory"); @@ -399,29 +266,26 @@ __copy_user_zeroing_intel(void *to, const void __user *from, unsigned long size) " popl %0\n" " jmp 8b\n" ".previous\n" - ".section __ex_table,\"a\"\n" - " .align 4\n" - " .long 0b,16b\n" - " .long 1b,16b\n" - " .long 2b,16b\n" - " .long 21b,16b\n" - " .long 3b,16b\n" - " .long 31b,16b\n" - " .long 4b,16b\n" - " .long 41b,16b\n" - " .long 10b,16b\n" - " .long 51b,16b\n" - " .long 11b,16b\n" - " .long 61b,16b\n" - " .long 12b,16b\n" - " .long 71b,16b\n" - " .long 13b,16b\n" - " .long 81b,16b\n" - " .long 14b,16b\n" - " .long 91b,16b\n" - " .long 6b,9b\n" - " .long 7b,16b\n" - ".previous" + _ASM_EXTABLE(0b,16b) + _ASM_EXTABLE(1b,16b) + _ASM_EXTABLE(2b,16b) + _ASM_EXTABLE(21b,16b) + _ASM_EXTABLE(3b,16b) + _ASM_EXTABLE(31b,16b) + _ASM_EXTABLE(4b,16b) + _ASM_EXTABLE(41b,16b) + _ASM_EXTABLE(10b,16b) + _ASM_EXTABLE(51b,16b) + _ASM_EXTABLE(11b,16b) + _ASM_EXTABLE(61b,16b) + _ASM_EXTABLE(12b,16b) + _ASM_EXTABLE(71b,16b) + _ASM_EXTABLE(13b,16b) + _ASM_EXTABLE(81b,16b) + _ASM_EXTABLE(14b,16b) + _ASM_EXTABLE(91b,16b) + _ASM_EXTABLE(6b,9b) + _ASM_EXTABLE(7b,16b) : "=&c"(size), "=&D" (d0), "=&S" (d1) : "1"(to), "2"(from), "0"(size) : "eax", "edx", "memory"); @@ -501,29 +365,26 @@ static unsigned long __copy_user_zeroing_intel_nocache(void *to, " popl %0\n" " jmp 8b\n" ".previous\n" - ".section __ex_table,\"a\"\n" - " .align 4\n" - " .long 0b,16b\n" - " .long 1b,16b\n" - " .long 2b,16b\n" - " .long 21b,16b\n" - " .long 3b,16b\n" - " .long 31b,16b\n" - " .long 4b,16b\n" - " .long 41b,16b\n" - " .long 10b,16b\n" - " .long 51b,16b\n" - " .long 11b,16b\n" - " .long 61b,16b\n" - " .long 12b,16b\n" - " .long 71b,16b\n" - " .long 13b,16b\n" - " .long 81b,16b\n" - " .long 14b,16b\n" - " .long 91b,16b\n" - " .long 6b,9b\n" - " .long 7b,16b\n" - ".previous" + _ASM_EXTABLE(0b,16b) + _ASM_EXTABLE(1b,16b) + _ASM_EXTABLE(2b,16b) + _ASM_EXTABLE(21b,16b) + _ASM_EXTABLE(3b,16b) + _ASM_EXTABLE(31b,16b) + _ASM_EXTABLE(4b,16b) + _ASM_EXTABLE(41b,16b) + _ASM_EXTABLE(10b,16b) + _ASM_EXTABLE(51b,16b) + _ASM_EXTABLE(11b,16b) + _ASM_EXTABLE(61b,16b) + _ASM_EXTABLE(12b,16b) + _ASM_EXTABLE(71b,16b) + _ASM_EXTABLE(13b,16b) + _ASM_EXTABLE(81b,16b) + _ASM_EXTABLE(14b,16b) + _ASM_EXTABLE(91b,16b) + _ASM_EXTABLE(6b,9b) + _ASM_EXTABLE(7b,16b) : "=&c"(size), "=&D" (d0), "=&S" (d1) : "1"(to), "2"(from), "0"(size) : "eax", "edx", "memory"); @@ -592,29 +453,26 @@ static unsigned long __copy_user_intel_nocache(void *to, "9: lea 0(%%eax,%0,4),%0\n" "16: jmp 8b\n" ".previous\n" - ".section __ex_table,\"a\"\n" - " .align 4\n" - " .long 0b,16b\n" - " .long 1b,16b\n" - " .long 2b,16b\n" - " .long 21b,16b\n" - " .long 3b,16b\n" - " .long 31b,16b\n" - " .long 4b,16b\n" - " .long 41b,16b\n" - " .long 10b,16b\n" - " .long 51b,16b\n" - " .long 11b,16b\n" - " .long 61b,16b\n" - " .long 12b,16b\n" - " .long 71b,16b\n" - " .long 13b,16b\n" - " .long 81b,16b\n" - " .long 14b,16b\n" - " .long 91b,16b\n" - " .long 6b,9b\n" - " .long 7b,16b\n" - ".previous" + _ASM_EXTABLE(0b,16b) + _ASM_EXTABLE(1b,16b) + _ASM_EXTABLE(2b,16b) + _ASM_EXTABLE(21b,16b) + _ASM_EXTABLE(3b,16b) + _ASM_EXTABLE(31b,16b) + _ASM_EXTABLE(4b,16b) + _ASM_EXTABLE(41b,16b) + _ASM_EXTABLE(10b,16b) + _ASM_EXTABLE(51b,16b) + _ASM_EXTABLE(11b,16b) + _ASM_EXTABLE(61b,16b) + _ASM_EXTABLE(12b,16b) + _ASM_EXTABLE(71b,16b) + _ASM_EXTABLE(13b,16b) + _ASM_EXTABLE(81b,16b) + _ASM_EXTABLE(14b,16b) + _ASM_EXTABLE(91b,16b) + _ASM_EXTABLE(6b,9b) + _ASM_EXTABLE(7b,16b) : "=&c"(size), "=&D" (d0), "=&S" (d1) : "1"(to), "2"(from), "0"(size) : "eax", "edx", "memory"); @@ -661,12 +519,9 @@ do { \ "3: lea 0(%3,%0,4),%0\n" \ " jmp 2b\n" \ ".previous\n" \ - ".section __ex_table,\"a\"\n" \ - " .align 4\n" \ - " .long 4b,5b\n" \ - " .long 0b,3b\n" \ - " .long 1b,2b\n" \ - ".previous" \ + _ASM_EXTABLE(4b,5b) \ + _ASM_EXTABLE(0b,3b) \ + _ASM_EXTABLE(1b,2b) \ : "=&c"(size), "=&D" (__d0), "=&S" (__d1), "=r"(__d2) \ : "3"(size), "0"(size), "1"(to), "2"(from) \ : "memory"); \ @@ -703,12 +558,9 @@ do { \ " popl %0\n" \ " jmp 2b\n" \ ".previous\n" \ - ".section __ex_table,\"a\"\n" \ - " .align 4\n" \ - " .long 4b,5b\n" \ - " .long 0b,3b\n" \ - " .long 1b,6b\n" \ - ".previous" \ + _ASM_EXTABLE(4b,5b) \ + _ASM_EXTABLE(0b,3b) \ + _ASM_EXTABLE(1b,6b) \ : "=&c"(size), "=&D" (__d0), "=&S" (__d1), "=r"(__d2) \ : "3"(size), "0"(size), "1"(to), "2"(from) \ : "memory"); \ |