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Diffstat (limited to 'arch/parisc/include/asm/uaccess.h')
-rw-r--r--arch/parisc/include/asm/uaccess.h126
1 files changed, 51 insertions, 75 deletions
diff --git a/arch/parisc/include/asm/uaccess.h b/arch/parisc/include/asm/uaccess.h
index ebf8a845b017..6c531d2c847e 100644
--- a/arch/parisc/include/asm/uaccess.h
+++ b/arch/parisc/include/asm/uaccess.h
@@ -7,19 +7,14 @@
*/
#include <asm/page.h>
#include <asm/cache.h>
+#include <asm/extable.h>
#include <linux/bug.h>
#include <linux/string.h>
-/*
- * Note that since kernel addresses are in a separate address space on
- * parisc, we don't need to do anything for access_ok().
- * We just let the page fault handler do the right thing. This also means
- * that put_user is the same as __put_user, etc.
- */
-
-#define access_ok(uaddr, size) \
- ( (uaddr) == (uaddr) )
+#define TASK_SIZE_MAX DEFAULT_TASK_SIZE
+#include <asm/pgtable.h>
+#include <asm-generic/access_ok.h>
#define put_user __put_user
#define get_user __get_user
@@ -32,36 +27,6 @@
#define STD_USER(sr, x, ptr) __put_user_asm(sr, "std", x, ptr)
#endif
-/*
- * The exception table contains two values: the first is the relative offset to
- * the address of the instruction that is allowed to fault, and the second is
- * the relative offset to the address of the fixup routine. Since relative
- * addresses are used, 32bit values are sufficient even on 64bit kernel.
- */
-
-#define ARCH_HAS_RELATIVE_EXTABLE
-struct exception_table_entry {
- int insn; /* relative address of insn that is allowed to fault. */
- int fixup; /* relative address of fixup routine */
-};
-
-#define ASM_EXCEPTIONTABLE_ENTRY( fault_addr, except_addr )\
- ".section __ex_table,\"aw\"\n" \
- ".word (" #fault_addr " - .), (" #except_addr " - .)\n\t" \
- ".previous\n"
-
-/*
- * ASM_EXCEPTIONTABLE_ENTRY_EFAULT() creates a special exception table entry
- * (with lowest bit set) for which the fault handler in fixup_exception() will
- * load -EFAULT into %r29 for a read or write fault, and zeroes the target
- * register in case of a read fault in get_user().
- */
-#define ASM_EXCEPTIONTABLE_REG 29
-#define ASM_EXCEPTIONTABLE_VAR(__variable) \
- register long __variable __asm__ ("r29") = 0
-#define ASM_EXCEPTIONTABLE_ENTRY_EFAULT( fault_addr, except_addr )\
- ASM_EXCEPTIONTABLE_ENTRY( fault_addr, except_addr + 1)
-
#define __get_user_internal(sr, val, ptr) \
({ \
ASM_EXCEPTIONTABLE_VAR(__gu_err); \
@@ -77,30 +42,44 @@ struct exception_table_entry {
__gu_err; \
})
-#define __get_user(val, ptr) \
-({ \
- __get_user_internal("%%sr3,", val, ptr); \
+#define __probe_user_internal(sr, error, ptr) \
+({ \
+ __asm__("\tproberi (%%sr%1,%2),%3,%0\n" \
+ "\tcmpiclr,= 1,%0,%0\n" \
+ "\tldi %4,%0\n" \
+ : "=r"(error) \
+ : "i"(sr), "r"(ptr), "i"(PRIV_USER), \
+ "i"(-EFAULT)); \
+})
+
+#define __get_user(val, ptr) \
+({ \
+ register long __gu_err; \
+ \
+ __gu_err = __get_user_internal(SR_USER, val, ptr); \
+ if (likely(!__gu_err)) \
+ __probe_user_internal(SR_USER, __gu_err, ptr); \
+ __gu_err; \
})
#define __get_user_asm(sr, val, ldx, ptr) \
{ \
register long __gu_val; \
\
- __asm__("1: " ldx " 0(" sr "%2),%0\n" \
+ __asm__("1: " ldx " 0(%%sr%2,%3),%0\n" \
"9:\n" \
- ASM_EXCEPTIONTABLE_ENTRY_EFAULT(1b, 9b) \
- : "=r"(__gu_val), "=r"(__gu_err) \
- : "r"(ptr), "1"(__gu_err)); \
+ ASM_EXCEPTIONTABLE_ENTRY_EFAULT(1b, 9b, "%1") \
+ : "=r"(__gu_val), "+r"(__gu_err) \
+ : "i"(sr), "r"(ptr)); \
\
(val) = (__force __typeof__(*(ptr))) __gu_val; \
}
-#define HAVE_GET_KERNEL_NOFAULT
#define __get_kernel_nofault(dst, src, type, err_label) \
{ \
type __z; \
long __err; \
- __err = __get_user_internal("%%sr0,", __z, (type *)(src)); \
+ __err = __get_user_internal(SR_KERNEL, __z, (type *)(src)); \
if (unlikely(__err)) \
goto err_label; \
else \
@@ -118,13 +97,13 @@ struct exception_table_entry {
} __gu_tmp; \
\
__asm__(" copy %%r0,%R0\n" \
- "1: ldw 0(" sr "%2),%0\n" \
- "2: ldw 4(" sr "%2),%R0\n" \
+ "1: ldw 0(%%sr%2,%3),%0\n" \
+ "2: ldw 4(%%sr%2,%3),%R0\n" \
"9:\n" \
- ASM_EXCEPTIONTABLE_ENTRY_EFAULT(1b, 9b) \
- ASM_EXCEPTIONTABLE_ENTRY_EFAULT(2b, 9b) \
- : "=&r"(__gu_tmp.l), "=r"(__gu_err) \
- : "r"(ptr), "1"(__gu_err)); \
+ ASM_EXCEPTIONTABLE_ENTRY_EFAULT(1b, 9b, "%1") \
+ ASM_EXCEPTIONTABLE_ENTRY_EFAULT(2b, 9b, "%1") \
+ : "=&r"(__gu_tmp.l), "+r"(__gu_err) \
+ : "i"(sr), "r"(ptr)); \
\
(val) = __gu_tmp.t; \
}
@@ -135,13 +114,12 @@ struct exception_table_entry {
#define __put_user_internal(sr, x, ptr) \
({ \
ASM_EXCEPTIONTABLE_VAR(__pu_err); \
- __typeof__(*(ptr)) __x = (__typeof__(*(ptr)))(x); \
\
switch (sizeof(*(ptr))) { \
- case 1: __put_user_asm(sr, "stb", __x, ptr); break; \
- case 2: __put_user_asm(sr, "sth", __x, ptr); break; \
- case 4: __put_user_asm(sr, "stw", __x, ptr); break; \
- case 8: STD_USER(sr, __x, ptr); break; \
+ case 1: __put_user_asm(sr, "stb", x, ptr); break; \
+ case 2: __put_user_asm(sr, "sth", x, ptr); break; \
+ case 4: __put_user_asm(sr, "stw", x, ptr); break; \
+ case 8: STD_USER(sr, x, ptr); break; \
default: BUILD_BUG(); \
} \
\
@@ -150,14 +128,16 @@ struct exception_table_entry {
#define __put_user(x, ptr) \
({ \
- __put_user_internal("%%sr3,", x, ptr); \
+ __typeof__(&*(ptr)) __ptr = ptr; \
+ __typeof__(*(__ptr)) __x = (__typeof__(*(__ptr)))(x); \
+ __put_user_internal(SR_USER, __x, __ptr); \
})
#define __put_kernel_nofault(dst, src, type, err_label) \
{ \
type __z = *(type *)(src); \
long __err; \
- __err = __put_user_internal("%%sr0,", __z, (type *)(dst)); \
+ __err = __put_user_internal(SR_KERNEL, __z, (type *)(dst)); \
if (unlikely(__err)) \
goto err_label; \
}
@@ -177,29 +157,28 @@ struct exception_table_entry {
#define __put_user_asm(sr, stx, x, ptr) \
__asm__ __volatile__ ( \
- "1: " stx " %2,0(" sr "%1)\n" \
+ "1: " stx " %1,0(%%sr%2,%3)\n" \
"9:\n" \
- ASM_EXCEPTIONTABLE_ENTRY_EFAULT(1b, 9b) \
- : "=r"(__pu_err) \
- : "r"(ptr), "r"(x), "0"(__pu_err))
+ ASM_EXCEPTIONTABLE_ENTRY_EFAULT(1b, 9b, "%0") \
+ : "+r"(__pu_err) \
+ : "r"(x), "i"(sr), "r"(ptr))
#if !defined(CONFIG_64BIT)
#define __put_user_asm64(sr, __val, ptr) do { \
__asm__ __volatile__ ( \
- "1: stw %2,0(" sr "%1)\n" \
- "2: stw %R2,4(" sr "%1)\n" \
+ "1: stw %1,0(%%sr%2,%3)\n" \
+ "2: stw %R1,4(%%sr%2,%3)\n" \
"9:\n" \
- ASM_EXCEPTIONTABLE_ENTRY_EFAULT(1b, 9b) \
- ASM_EXCEPTIONTABLE_ENTRY_EFAULT(2b, 9b) \
- : "=r"(__pu_err) \
- : "r"(ptr), "r"(__val), "0"(__pu_err)); \
+ ASM_EXCEPTIONTABLE_ENTRY_EFAULT(1b, 9b, "%0") \
+ ASM_EXCEPTIONTABLE_ENTRY_EFAULT(2b, 9b, "%0") \
+ : "+r"(__pu_err) \
+ : "r"(__val), "i"(sr), "r"(ptr)); \
} while (0)
#endif /* !defined(CONFIG_64BIT) */
-
/*
* Complex access routines -- external declarations
*/
@@ -221,7 +200,4 @@ unsigned long __must_check raw_copy_from_user(void *dst, const void __user *src,
#define INLINE_COPY_TO_USER
#define INLINE_COPY_FROM_USER
-struct pt_regs;
-int fixup_exception(struct pt_regs *regs);
-
#endif /* __PARISC_UACCESS_H */
generated by cgit (git 2.34.1) at 2025-12-25 22:39:01 +0000