Use the EVA specific functions from memcpy.S to perform
userspace operations. When get_fs() == get_ds() the usual load/store
instructions are used because the destination address is located in
the kernel address space region. Otherwise, the EVA specifc load/store
instructions are used which will go through th TLB to perform the virtual
to physical translation for the userspace address.
Signed-off-by: Markos Chandras <markos.chandras@xxxxxxxxxx>
---
arch/mips/include/asm/uaccess.h | 191 +++++++++++++++++++++++++++++++++++-----
1 file changed, 171 insertions(+), 20 deletions(-)
diff --git a/arch/mips/include/asm/uaccess.h b/arch/mips/include/asm/uaccess.h
index 59bbebb..fe72837 100644
--- a/arch/mips/include/asm/uaccess.h
+++ b/arch/mips/include/asm/uaccess.h
@@ -781,6 +781,7 @@ extern void __put_user_unaligned_unknown(void);
extern size_t __copy_user(void *__to, const void *__from, size_t __n);
+#ifndef CONFIG_EVA
#define __invoke_copy_to_user(to, from, n) \
({ \
register void __user *__cu_to_r __asm__("$4"); \
@@ -799,6 +800,11 @@ extern size_t __copy_user(void *__to, const void *__from, size_t __n);
__cu_len_r; \
})
+#define __invoke_copy_to_kernel(to, from, n) \
+ __invoke_copy_to_user(to, from, n)
+
+#endif
+
/*
* __copy_to_user: - Copy a block of data into user space, with less checking.
* @to: Destination address, in user space.
@@ -823,7 +829,12 @@ extern size_t __copy_user(void *__to, const void *__from, size_t __n);
__cu_from = (from); \
__cu_len = (n); \
might_fault(); \
- __cu_len = __invoke_copy_to_user(__cu_to, __cu_from, __cu_len); \
+ if (segment_eq(get_fs(), get_ds())) \
+ __cu_len = __invoke_copy_to_kernel(__cu_to, __cu_from, \
+ __cu_len); \
+ else \
+ __cu_len = __invoke_copy_to_user(__cu_to, __cu_from, \
+ __cu_len); \
__cu_len; \
})
@@ -838,7 +849,12 @@ extern size_t __copy_user_inatomic(void *__to, const void *__from, size_t __n);
__cu_to = (to); \
__cu_from = (from); \
__cu_len = (n); \
- __cu_len = __invoke_copy_to_user(__cu_to, __cu_from, __cu_len); \
+ if (segment_eq(get_fs(), get_ds())) \
+ __cu_len = __invoke_copy_to_kernel(__cu_to, __cu_from, \
+ __cu_len); \
+ else \
+ __cu_len = __invoke_copy_to_user(__cu_to, __cu_from, \
+ __cu_len); \
__cu_len; \
})
@@ -851,8 +867,14 @@ extern size_t __copy_user_inatomic(void *__to, const void *__from, size_t __n);
__cu_to = (to); \
__cu_from = (from); \
__cu_len = (n); \
- __cu_len = __invoke_copy_from_user_inatomic(__cu_to, __cu_from, \
- __cu_len); \
+ if (segment_eq(get_fs(), get_ds())) \
+ __cu_len = __invoke_copy_from_kernel_inatomic(__cu_to, \
+ __cu_from,\
+ __cu_len);\
+ else \
+ __cu_len = __invoke_copy_from_user_inatomic(__cu_to, \
+ __cu_from, \
+ __cu_len); \
__cu_len; \
})
@@ -878,14 +900,23 @@ extern size_t __copy_user_inatomic(void *__to, const void *__from, size_t __n);
__cu_to = (to); \
__cu_from = (from); \
__cu_len = (n); \
- if (access_ok(VERIFY_WRITE, __cu_to, __cu_len)) { \
- might_fault(); \
- __cu_len = __invoke_copy_to_user(__cu_to, __cu_from, \
- __cu_len); \
+ if (segment_eq(get_fs(), get_ds())) { \
+ __cu_len = __invoke_copy_to_kernel(__cu_to, \
+ __cu_from, \
+ __cu_len); \
+ } else { \
+ if (access_ok(VERIFY_WRITE, __cu_to, __cu_len)) { \
+ might_fault(); \
+ __cu_len = __invoke_copy_to_user(__cu_to, \
+ __cu_from, \
+ __cu_len); \
+ } \
} \
__cu_len; \
})
+#ifndef CONFIG_EVA
+
#define __invoke_copy_from_user(to, from, n) \
({ \
register void *__cu_to_r __asm__("$4"); \
@@ -909,6 +940,17 @@ extern size_t __copy_user_inatomic(void *__to, const void *__from, size_t __n);
__cu_len_r; \
})
+#define __invoke_copy_from_kernel(to, from, n) \
+ __invoke_copy_from_user(to, from, n)
+
+/* For userland <-> userland operations */
+#define ___invoke_copy_in_user(to, from, n) \
+ __invoke_copy_from_user(to, from, n)
+
+/* For kernel <-> kernel operations */
+#define ___invoke_copy_in_kernel(to, from, n) \
+ __invoke_copy_from_user(to, from, n)
+
#define __invoke_copy_from_user_inatomic(to, from, n) \
({ \
register void *__cu_to_r __asm__("$4"); \
@@ -932,6 +974,97 @@ extern size_t __copy_user_inatomic(void *__to, const void *__from, size_t __n);
__cu_len_r; \
})
+#define __invoke_copy_from_kernel_inatomic(to, from, n) \
+ __invoke_copy_from_user_inatomic(to, from, n) \
+
+#else
+
+/* EVA specific functions */
+
+extern size_t __copy_user_inatomic_eva(void *__to, const void *__from,
+ size_t __n);
+extern size_t __copy_from_user_eva(void *__to, const void *__from,
+ size_t __n);
+extern size_t __copy_to_user_eva(void *__to, const void *__from,
+ size_t __n);
+extern size_t __copy_in_user_eva(void *__to, const void *__from, size_t __n);
+
+#define __invoke_copy_from_user_eva_generic(to, from, n, func_ptr) \
+({ \
+ register void *__cu_to_r __asm__("$4"); \
+ register const void __user *__cu_from_r __asm__("$5"); \
+ register long __cu_len_r __asm__("$6"); \
+ \
+ __cu_to_r = (to); \
+ __cu_from_r = (from); \
+ __cu_len_r = (n); \
+ __asm__ __volatile__( \
+ ".set\tnoreorder\n\t" \
+ __MODULE_JAL(func_ptr) \
+ ".set\tnoat\n\t" \
+ __UA_ADDU "\t$1, %1, %2\n\t" \
+ ".set\tat\n\t" \
+ ".set\treorder" \
+ : "+r" (__cu_to_r), "+r" (__cu_from_r), "+r" (__cu_len_r) \
+ : \
+ : "$8", "$9", "$10", "$11", "$12", "$14", "$15", "$24", "$31", \
+ DADDI_SCRATCH, "memory"); \
+ __cu_len_r; \
+})
+
+#define __invoke_copy_to_user_eva_generic(to, from, n, func_ptr) \
+({ \
+ register void *__cu_to_r __asm__("$4"); \
+ register const void __user *__cu_from_r __asm__("$5"); \
+ register long __cu_len_r __asm__("$6"); \
+ \
+ __cu_to_r = (to); \
+ __cu_from_r = (from); \
+ __cu_len_r = (n); \
+ __asm__ __volatile__( \
+ __MODULE_JAL(func_ptr) \
+ : "+r" (__cu_to_r), "+r" (__cu_from_r), "+r" (__cu_len_r) \
+ : \
+ : "$8", "$9", "$10", "$11", "$12", "$14", "$15", "$24", "$31", \
+ DADDI_SCRATCH, "memory"); \
+ __cu_len_r; \
+})
+
+/*
+ * Source or destination address is in userland. We need to go through
+ * the TLB
+ */
+#define __invoke_copy_from_user(to, from, n) \
+ __invoke_copy_from_user_eva_generic(to, from, n, __copy_from_user_eva)
+
+#define __invoke_copy_from_user_inatomic(to, from, n) \
+ __invoke_copy_from_user_eva_generic(to, from, n, \
+ __copy_user_inatomic_eva)
+
+#define __invoke_copy_to_user(to, from, n) \
+ __invoke_copy_to_user_eva_generic(to, from, n, __copy_to_user_eva)
+
+#define ___invoke_copy_in_user(to, from, n) \
+ __invoke_copy_from_user_eva_generic(to, from, n, __copy_in_user_eva)
+
+/*
+ * Source or destination address in the kernel. We are not going through
+ * the TLB
+ */
+#define __invoke_copy_from_kernel(to, from, n) \
+ __invoke_copy_from_user_eva_generic(to, from, n, __copy_user)
+
+#define __invoke_copy_from_kernel_inatomic(to, from, n) \
+ __invoke_copy_from_user_eva_generic(to, from, n, __copy_user_inatomic)
+
+#define __invoke_copy_to_kernel(to, from, n) \
+ __invoke_copy_to_user_eva_generic(to, from, n, __copy_user)
+
+#define ___invoke_copy_in_kernel(to, from, n) \
+ __invoke_copy_from_user_eva_generic(to, from, n, __copy_user)
+
+#endif /* CONFIG_EVA */
+
/*
* __copy_from_user: - Copy a block of data from user space, with less checking.
* @to: Destination address, in kernel space.
@@ -989,10 +1122,17 @@ extern size_t __copy_user_inatomic(void *__to, const void *__from, size_t __n);
__cu_to = (to); \
__cu_from = (from); \
__cu_len = (n); \
- if (access_ok(VERIFY_READ, __cu_from, __cu_len)) { \
- might_fault(); \
- __cu_len = __invoke_copy_from_user(__cu_to, __cu_from, \
- __cu_len); \
+ if (segment_eq(get_fs(), get_ds())) { \
+ __cu_len = __invoke_copy_from_kernel(__cu_to, \
+ __cu_from, \
+ __cu_len); \
+ } else { \
+ if (access_ok(VERIFY_READ, __cu_from, __cu_len)) { \
+ might_fault(); \
+ __cu_len = __invoke_copy_from_user(__cu_to, \
+ __cu_from, \
+ __cu_len); \
+ } \
} \
__cu_len; \
})
@@ -1006,9 +1146,14 @@ extern size_t __copy_user_inatomic(void *__to, const void *__from, size_t __n);
__cu_to = (to); \
__cu_from = (from); \
__cu_len = (n); \
- might_fault(); \
- __cu_len = __invoke_copy_from_user(__cu_to, __cu_from, \
- __cu_len); \
+ if (segment_eq(get_fs(), get_ds())) { \
+ __cu_len = ___invoke_copy_in_kernel(__cu_to, __cu_from, \
+ __cu_len); \
+ } else { \
+ might_fault(); \
+ __cu_len = ___invoke_copy_in_user(__cu_to, __cu_from, \
+ __cu_len); \
+ } \
__cu_len; \
})
@@ -1021,11 +1166,17 @@ extern size_t __copy_user_inatomic(void *__to, const void *__from, size_t __n);
__cu_to = (to); \
__cu_from = (from); \
__cu_len = (n); \
- if (likely(access_ok(VERIFY_READ, __cu_from, __cu_len) && \
- access_ok(VERIFY_WRITE, __cu_to, __cu_len))) { \
- might_fault(); \
- __cu_len = __invoke_copy_from_user(__cu_to, __cu_from, \
- __cu_len); \
+ if (segment_eq(get_fs(), get_ds())) { \
+ __cu_len = ___invoke_copy_in_kernel(__cu_to,__cu_from, \
+ __cu_len); \
+ } else { \
+ if (likely(access_ok(VERIFY_READ, __cu_from, __cu_len) &&\
+ access_ok(VERIFY_WRITE, __cu_to, __cu_len))) {\
+ might_fault(); \
+ __cu_len = ___invoke_copy_in_user(__cu_to, \
+ __cu_from, \
+ __cu_len); \
+ } \
} \
__cu_len; \
})
--
1.8.5.3
