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Diffstat (limited to 'arch/powerpc/include/asm/uaccess.h')
-rw-r--r--arch/powerpc/include/asm/uaccess.h142
1 files changed, 43 insertions, 99 deletions
diff --git a/arch/powerpc/include/asm/uaccess.h b/arch/powerpc/include/asm/uaccess.h
index 20a35373cafc..ef5bbb705c08 100644
--- a/arch/powerpc/include/asm/uaccess.h
+++ b/arch/powerpc/include/asm/uaccess.h
@@ -8,62 +8,21 @@
#include <asm/extable.h>
#include <asm/kup.h>
-/*
- * The fs value determines whether argument validity checking should be
- * performed or not. If get_fs() == USER_DS, checking is performed, with
- * get_fs() == KERNEL_DS, checking is bypassed.
- *
- * For historical reasons, these macros are grossly misnamed.
- *
- * The fs/ds values are now the highest legal address in the "segment".
- * This simplifies the checking in the routines below.
- */
-
-#define MAKE_MM_SEG(s) ((mm_segment_t) { (s) })
-
-#define KERNEL_DS MAKE_MM_SEG(~0UL)
#ifdef __powerpc64__
/* We use TASK_SIZE_USER64 as TASK_SIZE is not constant */
-#define USER_DS MAKE_MM_SEG(TASK_SIZE_USER64 - 1)
+#define TASK_SIZE_MAX TASK_SIZE_USER64
#else
-#define USER_DS MAKE_MM_SEG(TASK_SIZE - 1)
+#define TASK_SIZE_MAX TASK_SIZE
#endif
-#define get_fs() (current->thread.addr_limit)
-
-static inline void set_fs(mm_segment_t fs)
+static inline bool __access_ok(unsigned long addr, unsigned long size)
{
- current->thread.addr_limit = fs;
- /* On user-mode return check addr_limit (fs) is correct */
- set_thread_flag(TIF_FSCHECK);
+ return addr < TASK_SIZE_MAX && size <= TASK_SIZE_MAX - addr;
}
-#define uaccess_kernel() (get_fs().seg == KERNEL_DS.seg)
-#define user_addr_max() (get_fs().seg)
-
-#ifdef __powerpc64__
-/*
- * This check is sufficient because there is a large enough
- * gap between user addresses and the kernel addresses
- */
-#define __access_ok(addr, size, segment) \
- (((addr) <= (segment).seg) && ((size) <= (segment).seg))
-
-#else
-
-static inline int __access_ok(unsigned long addr, unsigned long size,
- mm_segment_t seg)
-{
- if (addr > seg.seg)
- return 0;
- return (size == 0 || size - 1 <= seg.seg - addr);
-}
-
-#endif
-
#define access_ok(addr, size) \
(__chk_user_ptr(addr), \
- __access_ok((__force unsigned long)(addr), (size), get_fs()))
+ __access_ok((unsigned long)(addr), (size)))
/*
* These are the main single-value transfer routines. They automatically
@@ -151,52 +110,16 @@ static inline int __access_ok(unsigned long addr, unsigned long size,
extern long __put_user_bad(void);
-/*
- * We don't tell gcc that we are accessing memory, but this is OK
- * because we do not write to any memory gcc knows about, so there
- * are no aliasing issues.
- */
-#define __put_user_asm(x, addr, err, op) \
- __asm__ __volatile__( \
- "1: " op " %1,0(%2) # put_user\n" \
- "2:\n" \
- ".section .fixup,\"ax\"\n" \
- "3: li %0,%3\n" \
- " b 2b\n" \
- ".previous\n" \
- EX_TABLE(1b, 3b) \
- : "=r" (err) \
- : "r" (x), "b" (addr), "i" (-EFAULT), "0" (err))
-
-#ifdef __powerpc64__
-#define __put_user_asm2(x, ptr, retval) \
- __put_user_asm(x, ptr, retval, "std")
-#else /* __powerpc64__ */
-#define __put_user_asm2(x, addr, err) \
- __asm__ __volatile__( \
- "1: stw %1,0(%2)\n" \
- "2: stw %1+1,4(%2)\n" \
- "3:\n" \
- ".section .fixup,\"ax\"\n" \
- "4: li %0,%3\n" \
- " b 3b\n" \
- ".previous\n" \
- EX_TABLE(1b, 4b) \
- EX_TABLE(2b, 4b) \
- : "=r" (err) \
- : "r" (x), "b" (addr), "i" (-EFAULT), "0" (err))
-#endif /* __powerpc64__ */
-
#define __put_user_size_allowed(x, ptr, size, retval) \
do { \
+ __label__ __pu_failed; \
+ \
retval = 0; \
- switch (size) { \
- case 1: __put_user_asm(x, ptr, retval, "stb"); break; \
- case 2: __put_user_asm(x, ptr, retval, "sth"); break; \
- case 4: __put_user_asm(x, ptr, retval, "stw"); break; \
- case 8: __put_user_asm2(x, ptr, retval); break; \
- default: __put_user_bad(); \
- } \
+ __put_user_size_goto(x, ptr, size, __pu_failed); \
+ break; \
+ \
+__pu_failed: \
+ retval = -EFAULT; \
} while (0)
#define __put_user_size(x, ptr, size, retval) \
@@ -249,12 +172,17 @@ do { \
})
+/*
+ * We don't tell gcc that we are accessing memory, but this is OK
+ * because we do not write to any memory gcc knows about, so there
+ * are no aliasing issues.
+ */
#define __put_user_asm_goto(x, addr, label, op) \
asm volatile goto( \
"1: " op "%U1%X1 %0,%1 # put_user\n" \
EX_TABLE(1b, %l2) \
: \
- : "r" (x), "m" (*addr) \
+ : "r" (x), "m"UPD_CONSTR (*addr) \
: \
: label)
@@ -316,7 +244,7 @@ extern long __get_user_bad(void);
#define __get_user_asm(x, addr, err, op) \
__asm__ __volatile__( \
- "1: "op" %1,0(%2) # get_user\n" \
+ "1: "op"%U2%X2 %1, %2 # get_user\n" \
"2:\n" \
".section .fixup,\"ax\"\n" \
"3: li %0,%3\n" \
@@ -325,7 +253,7 @@ extern long __get_user_bad(void);
".previous\n" \
EX_TABLE(1b, 3b) \
: "=r" (err), "=r" (x) \
- : "b" (addr), "i" (-EFAULT), "0" (err))
+ : "m"UPD_CONSTR (*addr), "i" (-EFAULT), "0" (err))
#ifdef __powerpc64__
#define __get_user_asm2(x, addr, err) \
@@ -333,8 +261,8 @@ extern long __get_user_bad(void);
#else /* __powerpc64__ */
#define __get_user_asm2(x, addr, err) \
__asm__ __volatile__( \
- "1: lwz %1,0(%2)\n" \
- "2: lwz %1+1,4(%2)\n" \
+ "1: lwz%X2 %1, %2\n" \
+ "2: lwz%X2 %L1, %L2\n" \
"3:\n" \
".section .fixup,\"ax\"\n" \
"4: li %0,%3\n" \
@@ -345,7 +273,7 @@ extern long __get_user_bad(void);
EX_TABLE(1b, 4b) \
EX_TABLE(2b, 4b) \
: "=r" (err), "=&r" (x) \
- : "b" (addr), "i" (-EFAULT), "0" (err))
+ : "m" (*addr), "i" (-EFAULT), "0" (err))
#endif /* __powerpc64__ */
#define __get_user_size_allowed(x, ptr, size, retval) \
@@ -355,10 +283,10 @@ do { \
if (size > sizeof(x)) \
(x) = __get_user_bad(); \
switch (size) { \
- case 1: __get_user_asm(x, ptr, retval, "lbz"); break; \
- case 2: __get_user_asm(x, ptr, retval, "lhz"); break; \
- case 4: __get_user_asm(x, ptr, retval, "lwz"); break; \
- case 8: __get_user_asm2(x, ptr, retval); break; \
+ case 1: __get_user_asm(x, (u8 __user *)ptr, retval, "lbz"); break; \
+ case 2: __get_user_asm(x, (u16 __user *)ptr, retval, "lhz"); break; \
+ case 4: __get_user_asm(x, (u32 __user *)ptr, retval, "lwz"); break; \
+ case 8: __get_user_asm2(x, (u64 __user *)ptr, retval); break; \
default: (x) = __get_user_bad(); \
} \
} while (0)
@@ -635,4 +563,20 @@ do { \
__put_user_goto(*(u8*)(_src + _i), (u8 __user *)(_dst + _i), e);\
} while (0)
+#define HAVE_GET_KERNEL_NOFAULT
+
+#define __get_kernel_nofault(dst, src, type, err_label) \
+do { \
+ int __kr_err; \
+ \
+ __get_user_size_allowed(*((type *)(dst)), (__force type __user *)(src),\
+ sizeof(type), __kr_err); \
+ if (unlikely(__kr_err)) \
+ goto err_label; \
+} while (0)
+
+#define __put_kernel_nofault(dst, src, type, err_label) \
+ __put_user_size_goto(*((type *)(src)), \
+ (__force type __user *)(dst), sizeof(type), err_label)
+
#endif /* _ARCH_POWERPC_UACCESS_H */
generated by cgit (git 2.34.1) at 2024-05-10 06:59:39 +0000