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| author | Helge Deller <deller@gmx.de> | 2016-04-09 08:27:08 +0200 |
|---|---|---|
| committer | Helge Deller <deller@gmx.de> | 2016-05-22 21:39:04 +0200 |
| commit | d2ad824f4bb8d146ea6e5f440dddb30b9ccfd98c (patch) | |
| tree | bfc218919d3d8a93f46ad29cf2a19a847e8665a2 /arch/parisc | |
| parent | 06bff6b9d7d50566a9320f64b0624957798cb08b (diff) | |
| download | lwn-d2ad824f4bb8d146ea6e5f440dddb30b9ccfd98c.tar.gz lwn-d2ad824f4bb8d146ea6e5f440dddb30b9ccfd98c.zip | |
parisc: Add 64bit get_user() and put_user() for 32bit kernel
Allow accessing 64-bit values in userspace from a 32-bit kernel.
The access is not atomic.
Signed-off-by: Helge Deller <deller@gmx.de>
Diffstat (limited to 'arch/parisc')
| -rw-r--r-- | arch/parisc/include/asm/uaccess.h | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/arch/parisc/include/asm/uaccess.h b/arch/parisc/include/asm/uaccess.h index 56b7208da9a4..0f59fd9ca205 100644 --- a/arch/parisc/include/asm/uaccess.h +++ b/arch/parisc/include/asm/uaccess.h @@ -40,7 +40,7 @@ static inline long access_ok(int type, const void __user * addr, #define get_user __get_user #if !defined(CONFIG_64BIT) -#define LDD_USER(ptr) BUILD_BUG() +#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) @@ -114,6 +114,20 @@ struct exception_data { : "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; \ |