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parisc: Fix get_user() for 64-bit value on 32-bit kernel 

This fixes a bug in which the upper 32-bits of a 64-bit value which is
read by get_user() was lost on a 32-bit kernel.
While touching this code, split out pre-loading of %sr2 space register
and clean up code indent.

Cc: <stable@vger.kernel.org> # v4.9+
Signed-off-by: Helge Deller <deller@gmx.de>
This commit is contained in:
Helge Deller 2017-04-16 10:00:14 +02:00
parent d5ff0814fd
commit 3f795cef0e
1 changed files with 55 additions and 31 deletions
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86
arch/parisc/include/asm/uaccess.h
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@ -39,10 +39,10 @@
#define get_user __get_user
#if !defined(CONFIG_64BIT)
#define LDD_USER(ptr) __get_user_asm64(ptr)
#define LDD_USER(val, ptr) __get_user_asm64(val, ptr)
#define STD_USER(x, ptr) __put_user_asm64(x, ptr)
#else
#define LDD_USER(ptr) __get_user_asm("ldd", ptr)
#define LDD_USER(val, ptr) __get_user_asm(val, "ldd", ptr)
#define STD_USER(x, ptr) __put_user_asm("std", x, ptr)
#endif
@ -97,63 +97,87 @@ struct exception_data {
" mtsp %0,%%sr2\n\t" \
: : "r"(get_fs()) : )
#define __get_user(x, ptr) \
({ \
register long __gu_err __asm__ ("r8") = 0; \
register long __gu_val; \
\
load_sr2(); \
switch (sizeof(*(ptr))) { \
case 1: __get_user_asm("ldb", ptr); break; \
case 2: __get_user_asm("ldh", ptr); break; \
case 4: __get_user_asm("ldw", ptr); break; \
case 8: LDD_USER(ptr); break; \
default: BUILD_BUG(); break; \
} \
\
(x) = (__force __typeof__(*(ptr))) __gu_val; \
__gu_err; \
#define __get_user_internal(val, ptr) \
({ \
register long __gu_err __asm__ ("r8") = 0; \
\
switch (sizeof(*(ptr))) { \
case 1: __get_user_asm(val, "ldb", ptr); break; \
case 2: __get_user_asm(val, "ldh", ptr); break; \
case 4: __get_user_asm(val, "ldw", ptr); break; \
case 8: LDD_USER(val, ptr); break; \
default: BUILD_BUG(); \
} \
\
__gu_err; \
})
#define __get_user_asm(ldx, ptr) \
#define __get_user(val, ptr) \
({ \
load_sr2(); \
__get_user_internal(val, ptr); \
})
#define __get_user_asm(val, ldx, ptr) \
{ \
register long __gu_val; \
\
__asm__("1: " ldx " 0(%%sr2,%2),%0\n" \
"9:\n" \
ASM_EXCEPTIONTABLE_ENTRY_EFAULT(1b, 9b) \
: "=r"(__gu_val), "=r"(__gu_err) \
: "r"(ptr), "1"(__gu_err));
: "r"(ptr), "1"(__gu_err)); \
\
(val) = (__force __typeof__(*(ptr))) __gu_val; \
}
#if !defined(CONFIG_64BIT)
#define __get_user_asm64(ptr) \
#define __get_user_asm64(val, ptr) \
{ \
union { \
unsigned long long l; \
__typeof__(*(ptr)) t; \
} __gu_tmp; \
\
__asm__(" copy %%r0,%R0\n" \
"1: ldw 0(%%sr2,%2),%0\n" \
"2: ldw 4(%%sr2,%2),%R0\n" \
"9:\n" \
ASM_EXCEPTIONTABLE_ENTRY_EFAULT(1b, 9b) \
ASM_EXCEPTIONTABLE_ENTRY_EFAULT(2b, 9b) \
: "=r"(__gu_val), "=r"(__gu_err) \
: "r"(ptr), "1"(__gu_err));
: "=&r"(__gu_tmp.l), "=r"(__gu_err) \
: "r"(ptr), "1"(__gu_err)); \
\
(val) = __gu_tmp.t; \
}
#endif /* !defined(CONFIG_64BIT) */
#define __put_user(x, ptr) \
#define __put_user_internal(x, ptr) \
({ \
register long __pu_err __asm__ ("r8") = 0; \
__typeof__(*(ptr)) __x = (__typeof__(*(ptr)))(x); \
\
load_sr2(); \
switch (sizeof(*(ptr))) { \
case 1: __put_user_asm("stb", __x, ptr); break; \
case 2: __put_user_asm("sth", __x, ptr); break; \
case 4: __put_user_asm("stw", __x, ptr); break; \
case 8: STD_USER(__x, ptr); break; \
default: BUILD_BUG(); break; \
} \
case 1: __put_user_asm("stb", __x, ptr); break; \
case 2: __put_user_asm("sth", __x, ptr); break; \
case 4: __put_user_asm("stw", __x, ptr); break; \
case 8: STD_USER(__x, ptr); break; \
default: BUILD_BUG(); \
} \
\
__pu_err; \
})
#define __put_user(x, ptr) \
({ \
load_sr2(); \
__put_user_internal(x, ptr); \
})
/*
* The "__put_user/kernel_asm()" macros tell gcc they read from memory
* instead of writing. This is because they do not write to any memory