MIPS: asm: uaccess: Add EVA support to copy_{in, to,from}_user
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@imgtec.com>
This commit is contained in:
Markos Chandras
Ralf Baechle
parent
0081ad2486
commit
05c6516005
1 changed files with 171 additions and 20 deletions
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@ -781,6 +781,7 @@ extern void __put_user_unaligned_unknown(void);
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extern size_t __copy_user(void *__to, const void *__from, size_t __n);
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#ifndef CONFIG_EVA
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#define __invoke_copy_to_user(to, from, n) \
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({ \
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register void __user *__cu_to_r __asm__("$4"); \
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@ -799,6 +800,11 @@ extern size_t __copy_user(void *__to, const void *__from, size_t __n);
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__cu_len_r; \
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})
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#define __invoke_copy_to_kernel(to, from, n) \
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__invoke_copy_to_user(to, from, n)
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#endif
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/*
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* __copy_to_user: - Copy a block of data into user space, with less checking.
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* @to: Destination address, in user space.
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@ -823,7 +829,12 @@ extern size_t __copy_user(void *__to, const void *__from, size_t __n);
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__cu_from = (from); \
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__cu_len = (n); \
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might_fault(); \
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__cu_len = __invoke_copy_to_user(__cu_to, __cu_from, __cu_len); \
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if (segment_eq(get_fs(), get_ds())) \
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__cu_len = __invoke_copy_to_kernel(__cu_to, __cu_from, \
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__cu_len); \
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else \
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__cu_len = __invoke_copy_to_user(__cu_to, __cu_from, \
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__cu_len); \
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__cu_len; \
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})
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@ -838,7 +849,12 @@ extern size_t __copy_user_inatomic(void *__to, const void *__from, size_t __n);
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__cu_to = (to); \
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__cu_from = (from); \
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__cu_len = (n); \
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__cu_len = __invoke_copy_to_user(__cu_to, __cu_from, __cu_len); \
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if (segment_eq(get_fs(), get_ds())) \
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__cu_len = __invoke_copy_to_kernel(__cu_to, __cu_from, \
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__cu_len); \
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else \
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__cu_len = __invoke_copy_to_user(__cu_to, __cu_from, \
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__cu_len); \
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__cu_len; \
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})
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@ -851,8 +867,14 @@ extern size_t __copy_user_inatomic(void *__to, const void *__from, size_t __n);
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__cu_to = (to); \
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__cu_from = (from); \
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__cu_len = (n); \
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__cu_len = __invoke_copy_from_user_inatomic(__cu_to, __cu_from, \
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__cu_len); \
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if (segment_eq(get_fs(), get_ds())) \
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__cu_len = __invoke_copy_from_kernel_inatomic(__cu_to, \
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__cu_from,\
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__cu_len);\
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else \
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__cu_len = __invoke_copy_from_user_inatomic(__cu_to, \
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__cu_from, \
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__cu_len); \
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__cu_len; \
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})
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@ -878,14 +900,23 @@ extern size_t __copy_user_inatomic(void *__to, const void *__from, size_t __n);
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__cu_to = (to); \
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__cu_from = (from); \
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__cu_len = (n); \
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if (access_ok(VERIFY_WRITE, __cu_to, __cu_len)) { \
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might_fault(); \
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__cu_len = __invoke_copy_to_user(__cu_to, __cu_from, \
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__cu_len); \
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if (segment_eq(get_fs(), get_ds())) { \
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__cu_len = __invoke_copy_to_kernel(__cu_to, \
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__cu_from, \
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__cu_len); \
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} else { \
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if (access_ok(VERIFY_WRITE, __cu_to, __cu_len)) { \
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might_fault(); \
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__cu_len = __invoke_copy_to_user(__cu_to, \
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__cu_from, \
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__cu_len); \
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} \
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} \
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__cu_len; \
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})
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#ifndef CONFIG_EVA
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#define __invoke_copy_from_user(to, from, n) \
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({ \
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register void *__cu_to_r __asm__("$4"); \
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@ -909,6 +940,17 @@ extern size_t __copy_user_inatomic(void *__to, const void *__from, size_t __n);
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__cu_len_r; \
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})
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#define __invoke_copy_from_kernel(to, from, n) \
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__invoke_copy_from_user(to, from, n)
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/* For userland <-> userland operations */
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#define ___invoke_copy_in_user(to, from, n) \
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__invoke_copy_from_user(to, from, n)
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/* For kernel <-> kernel operations */
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#define ___invoke_copy_in_kernel(to, from, n) \
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__invoke_copy_from_user(to, from, n)
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#define __invoke_copy_from_user_inatomic(to, from, n) \
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({ \
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register void *__cu_to_r __asm__("$4"); \
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@ -932,6 +974,97 @@ extern size_t __copy_user_inatomic(void *__to, const void *__from, size_t __n);
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__cu_len_r; \
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})
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#define __invoke_copy_from_kernel_inatomic(to, from, n) \
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__invoke_copy_from_user_inatomic(to, from, n) \
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#else
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/* EVA specific functions */
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extern size_t __copy_user_inatomic_eva(void *__to, const void *__from,
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size_t __n);
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extern size_t __copy_from_user_eva(void *__to, const void *__from,
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size_t __n);
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extern size_t __copy_to_user_eva(void *__to, const void *__from,
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size_t __n);
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extern size_t __copy_in_user_eva(void *__to, const void *__from, size_t __n);
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#define __invoke_copy_from_user_eva_generic(to, from, n, func_ptr) \
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({ \
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register void *__cu_to_r __asm__("$4"); \
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register const void __user *__cu_from_r __asm__("$5"); \
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register long __cu_len_r __asm__("$6"); \
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\
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__cu_to_r = (to); \
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__cu_from_r = (from); \
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__cu_len_r = (n); \
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__asm__ __volatile__( \
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".set\tnoreorder\n\t" \
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__MODULE_JAL(func_ptr) \
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".set\tnoat\n\t" \
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__UA_ADDU "\t$1, %1, %2\n\t" \
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".set\tat\n\t" \
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".set\treorder" \
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: "+r" (__cu_to_r), "+r" (__cu_from_r), "+r" (__cu_len_r) \
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: \
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: "$8", "$9", "$10", "$11", "$12", "$14", "$15", "$24", "$31", \
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DADDI_SCRATCH, "memory"); \
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__cu_len_r; \
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})
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#define __invoke_copy_to_user_eva_generic(to, from, n, func_ptr) \
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({ \
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register void *__cu_to_r __asm__("$4"); \
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register const void __user *__cu_from_r __asm__("$5"); \
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register long __cu_len_r __asm__("$6"); \
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\
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__cu_to_r = (to); \
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__cu_from_r = (from); \
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__cu_len_r = (n); \
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__asm__ __volatile__( \
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__MODULE_JAL(func_ptr) \
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: "+r" (__cu_to_r), "+r" (__cu_from_r), "+r" (__cu_len_r) \
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: \
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: "$8", "$9", "$10", "$11", "$12", "$14", "$15", "$24", "$31", \
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DADDI_SCRATCH, "memory"); \
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__cu_len_r; \
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})
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/*
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* Source or destination address is in userland. We need to go through
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* the TLB
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*/
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#define __invoke_copy_from_user(to, from, n) \
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__invoke_copy_from_user_eva_generic(to, from, n, __copy_from_user_eva)
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#define __invoke_copy_from_user_inatomic(to, from, n) \
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__invoke_copy_from_user_eva_generic(to, from, n, \
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__copy_user_inatomic_eva)
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#define __invoke_copy_to_user(to, from, n) \
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__invoke_copy_to_user_eva_generic(to, from, n, __copy_to_user_eva)
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#define ___invoke_copy_in_user(to, from, n) \
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__invoke_copy_from_user_eva_generic(to, from, n, __copy_in_user_eva)
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/*
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* Source or destination address in the kernel. We are not going through
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* the TLB
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*/
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#define __invoke_copy_from_kernel(to, from, n) \
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__invoke_copy_from_user_eva_generic(to, from, n, __copy_user)
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#define __invoke_copy_from_kernel_inatomic(to, from, n) \
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__invoke_copy_from_user_eva_generic(to, from, n, __copy_user_inatomic)
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#define __invoke_copy_to_kernel(to, from, n) \
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__invoke_copy_to_user_eva_generic(to, from, n, __copy_user)
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#define ___invoke_copy_in_kernel(to, from, n) \
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__invoke_copy_from_user_eva_generic(to, from, n, __copy_user)
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#endif /* CONFIG_EVA */
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/*
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* __copy_from_user: - Copy a block of data from user space, with less checking.
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* @to: Destination address, in kernel space.
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@ -989,10 +1122,17 @@ extern size_t __copy_user_inatomic(void *__to, const void *__from, size_t __n);
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__cu_to = (to); \
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__cu_from = (from); \
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__cu_len = (n); \
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if (access_ok(VERIFY_READ, __cu_from, __cu_len)) { \
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might_fault(); \
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__cu_len = __invoke_copy_from_user(__cu_to, __cu_from, \
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__cu_len); \
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if (segment_eq(get_fs(), get_ds())) { \
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__cu_len = __invoke_copy_from_kernel(__cu_to, \
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__cu_from, \
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__cu_len); \
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} else { \
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if (access_ok(VERIFY_READ, __cu_from, __cu_len)) { \
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might_fault(); \
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__cu_len = __invoke_copy_from_user(__cu_to, \
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__cu_from, \
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__cu_len); \
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} \
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} \
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__cu_len; \
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})
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@ -1006,9 +1146,14 @@ extern size_t __copy_user_inatomic(void *__to, const void *__from, size_t __n);
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__cu_to = (to); \
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__cu_from = (from); \
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__cu_len = (n); \
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might_fault(); \
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__cu_len = __invoke_copy_from_user(__cu_to, __cu_from, \
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__cu_len); \
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if (segment_eq(get_fs(), get_ds())) { \
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__cu_len = ___invoke_copy_in_kernel(__cu_to, __cu_from, \
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__cu_len); \
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} else { \
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might_fault(); \
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__cu_len = ___invoke_copy_in_user(__cu_to, __cu_from, \
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__cu_len); \
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} \
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__cu_len; \
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})
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@ -1021,11 +1166,17 @@ extern size_t __copy_user_inatomic(void *__to, const void *__from, size_t __n);
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__cu_to = (to); \
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__cu_from = (from); \
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__cu_len = (n); \
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if (likely(access_ok(VERIFY_READ, __cu_from, __cu_len) && \
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access_ok(VERIFY_WRITE, __cu_to, __cu_len))) { \
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might_fault(); \
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__cu_len = __invoke_copy_from_user(__cu_to, __cu_from, \
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__cu_len); \
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if (segment_eq(get_fs(), get_ds())) { \
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__cu_len = ___invoke_copy_in_kernel(__cu_to,__cu_from, \
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__cu_len); \
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} else { \
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if (likely(access_ok(VERIFY_READ, __cu_from, __cu_len) &&\
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access_ok(VERIFY_WRITE, __cu_to, __cu_len))) {\
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might_fault(); \
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__cu_len = ___invoke_copy_in_user(__cu_to, \
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__cu_from, \
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__cu_len); \
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} \
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} \
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__cu_len; \
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})
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