Commit d2ad824f authored by Helge Deller's avatar Helge Deller

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: default avatarHelge Deller <deller@gmx.de>
parent 06bff6b9
...@@ -40,7 +40,7 @@ static inline long access_ok(int type, const void __user * addr, ...@@ -40,7 +40,7 @@ static inline long access_ok(int type, const void __user * addr,
#define get_user __get_user #define get_user __get_user
#if !defined(CONFIG_64BIT) #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) #define STD_USER(x, ptr) __put_user_asm64(x, ptr)
#else #else
#define LDD_USER(ptr) __get_user_asm("ldd", ptr) #define LDD_USER(ptr) __get_user_asm("ldd", ptr)
...@@ -114,6 +114,20 @@ struct exception_data { ...@@ -114,6 +114,20 @@ struct exception_data {
: "r"(ptr), "1"(__gu_err) \ : "r"(ptr), "1"(__gu_err) \
: "r1"); : "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) \ #define __put_user(x, ptr) \
({ \ ({ \
register long __pu_err __asm__ ("r8") = 0; \ register long __pu_err __asm__ ("r8") = 0; \
......
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