diff options
Diffstat (limited to 'arch/m32r')
| -rw-r--r-- | arch/m32r/Kconfig | 1 | ||||
| -rw-r--r-- | arch/m32r/include/asm/Kbuild | 1 | ||||
| -rw-r--r-- | arch/m32r/include/asm/uaccess.h | 184 | ||||
| -rw-r--r-- | arch/m32r/kernel/m32r_ksyms.c | 2 | ||||
| -rw-r--r-- | arch/m32r/lib/usercopy.c | 21 |
5 files changed, 11 insertions, 198 deletions
diff --git a/arch/m32r/Kconfig b/arch/m32r/Kconfig index 95474460b367..b3e82bdd6db0 100644 --- a/arch/m32r/Kconfig +++ b/arch/m32r/Kconfig @@ -19,6 +19,7 @@ config M32R select HAVE_DEBUG_STACKOVERFLOW select CPU_NO_EFFICIENT_FFS select DMA_NOOP_OPS + select ARCH_HAS_RAW_COPY_USER config SBUS bool diff --git a/arch/m32r/include/asm/Kbuild b/arch/m32r/include/asm/Kbuild index deb298777df2..c000ffac8586 100644 --- a/arch/m32r/include/asm/Kbuild +++ b/arch/m32r/include/asm/Kbuild @@ -2,6 +2,7 @@ generic-y += clkdev.h generic-y += current.h generic-y += exec.h +generic-y += extable.h generic-y += irq_work.h generic-y += kvm_para.h generic-y += mcs_spinlock.h diff --git a/arch/m32r/include/asm/uaccess.h b/arch/m32r/include/asm/uaccess.h index 96b0efdb5f22..07be349c00ad 100644 --- a/arch/m32r/include/asm/uaccess.h +++ b/arch/m32r/include/asm/uaccess.h @@ -13,6 +13,7 @@ */ #include <asm/page.h> #include <asm/setup.h> +#include <linux/prefetch.h> /* * The fs value determines whether argument validity checking should be @@ -109,25 +110,7 @@ static inline int access_ok(int type, const void *addr, unsigned long size) } #endif /* CONFIG_MMU */ -/* - * 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; -}; - -extern int fixup_exception(struct pt_regs *regs); +#include <asm/extable.h> /* * These are the main single-value transfer routines. They automatically @@ -478,174 +461,25 @@ do { \ : "r14", "memory"); \ } while (0) -#define __copy_user_zeroing(to, from, size) \ -do { \ - unsigned long __dst, __src, __c; \ - __asm__ __volatile__ ( \ - " mv r14, %0\n" \ - " or r14, %1\n" \ - " beq %0, %1, 9f\n" \ - " beqz %2, 9f\n" \ - " and3 r14, r14, #3\n" \ - " bnez r14, 2f\n" \ - " and3 %2, %2, #3\n" \ - " beqz %3, 2f\n" \ - " addi %0, #-4 ; word_copy \n" \ - " .fillinsn\n" \ - "0: ld r14, @%1+\n" \ - " addi %3, #-1\n" \ - " .fillinsn\n" \ - "1: st r14, @+%0\n" \ - " bnez %3, 0b\n" \ - " beqz %2, 9f\n" \ - " addi %0, #4\n" \ - " .fillinsn\n" \ - "2: ldb r14, @%1 ; byte_copy \n" \ - " .fillinsn\n" \ - "3: stb r14, @%0\n" \ - " addi %1, #1\n" \ - " addi %2, #-1\n" \ - " addi %0, #1\n" \ - " bnez %2, 2b\n" \ - " .fillinsn\n" \ - "9:\n" \ - ".section .fixup,\"ax\"\n" \ - " .balign 4\n" \ - "5: addi %3, #1\n" \ - " addi %1, #-4\n" \ - " .fillinsn\n" \ - "6: slli %3, #2\n" \ - " add %2, %3\n" \ - " addi %0, #4\n" \ - " .fillinsn\n" \ - "7: ldi r14, #0 ; store zero \n" \ - " .fillinsn\n" \ - "8: addi %2, #-1\n" \ - " stb r14, @%0 ; ACE? \n" \ - " addi %0, #1\n" \ - " bnez %2, 8b\n" \ - " seth r14, #high(9b)\n" \ - " or3 r14, r14, #low(9b)\n" \ - " jmp r14\n" \ - ".previous\n" \ - ".section __ex_table,\"a\"\n" \ - " .balign 4\n" \ - " .long 0b,6b\n" \ - " .long 1b,5b\n" \ - " .long 2b,7b\n" \ - " .long 3b,7b\n" \ - ".previous\n" \ - : "=&r" (__dst), "=&r" (__src), "=&r" (size), \ - "=&r" (__c) \ - : "0" (to), "1" (from), "2" (size), "3" (size / 4) \ - : "r14", "memory"); \ -} while (0) - - /* We let the __ versions of copy_from/to_user inline, because they're often * used in fast paths and have only a small space overhead. */ -static inline unsigned long __generic_copy_from_user_nocheck(void *to, - const void __user *from, unsigned long n) +static inline unsigned long +raw_copy_from_user(void *to, const void __user *from, unsigned long n) { - __copy_user_zeroing(to, from, n); + prefetchw(to); + __copy_user(to, from, n); return n; } -static inline unsigned long __generic_copy_to_user_nocheck(void __user *to, - const void *from, unsigned long n) +static inline unsigned long +raw_copy_to_user(void __user *to, const void *from, unsigned long n) { + prefetch(from); __copy_user(to, from, n); return n; } -unsigned long __generic_copy_to_user(void __user *, const void *, unsigned long); -unsigned long __generic_copy_from_user(void *, const void __user *, unsigned long); - -/** - * __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 if pagefaults are - * enabled. - * - * 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. - */ -#define __copy_to_user(to, from, n) \ - __generic_copy_to_user_nocheck((to), (from), (n)) - -#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 if pagefaults are - * enabled. - * - * Copy data from kernel space to user space. - * - * Returns number of bytes that could not be copied. - * On success, this will be zero. - */ -#define copy_to_user(to, from, n) \ -({ \ - might_fault(); \ - __generic_copy_to_user((to), (from), (n)); \ -}) - -/** - * __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 if pagefaults are - * enabled. - * - * 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. - */ -#define __copy_from_user(to, from, n) \ - __generic_copy_from_user_nocheck((to), (from), (n)) - -/** - * 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 if pagefaults are - * enabled. - * - * 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. - */ -#define copy_from_user(to, from, n) \ -({ \ - might_fault(); \ - __generic_copy_from_user((to), (from), (n)); \ -}) - long __must_check strncpy_from_user(char *dst, const char __user *src, long count); long __must_check __strncpy_from_user(char *dst, diff --git a/arch/m32r/kernel/m32r_ksyms.c b/arch/m32r/kernel/m32r_ksyms.c index d763f0bd2106..a4d43b5cc102 100644 --- a/arch/m32r/kernel/m32r_ksyms.c +++ b/arch/m32r/kernel/m32r_ksyms.c @@ -26,8 +26,6 @@ EXPORT_SYMBOL(strncpy_from_user); EXPORT_SYMBOL(__strncpy_from_user); EXPORT_SYMBOL(clear_user); EXPORT_SYMBOL(__clear_user); -EXPORT_SYMBOL(__generic_copy_from_user); -EXPORT_SYMBOL(__generic_copy_to_user); EXPORT_SYMBOL(strnlen_user); #ifdef CONFIG_SMP diff --git a/arch/m32r/lib/usercopy.c b/arch/m32r/lib/usercopy.c index fd03f2731f20..b3ef2c899f96 100644 --- a/arch/m32r/lib/usercopy.c +++ b/arch/m32r/lib/usercopy.c @@ -11,27 +11,6 @@ #include <linux/thread_info.h> #include <linux/uaccess.h> -unsigned long -__generic_copy_to_user(void __user *to, const void *from, unsigned long n) -{ - prefetch(from); - if (access_ok(VERIFY_WRITE, to, n)) - __copy_user(to,from,n); - return n; -} - -unsigned long -__generic_copy_from_user(void *to, const void __user *from, unsigned long n) -{ - prefetchw(to); - if (access_ok(VERIFY_READ, from, n)) - __copy_user_zeroing(to,from,n); - else - memset(to, 0, n); - return n; -} - - /* * Copy a null terminated string from userspace. */ |
