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Diffstat (limited to 'arch/mips/include/asm/uaccess.h')
-rw-r--r--arch/mips/include/asm/uaccess.h674
1 files changed, 499 insertions, 175 deletions
diff --git a/arch/mips/include/asm/uaccess.h b/arch/mips/include/asm/uaccess.h
index 653a412c036..a1095109023 100644
--- a/arch/mips/include/asm/uaccess.h
+++ b/arch/mips/include/asm/uaccess.h
@@ -6,6 +6,7 @@
* Copyright (C) 1996, 1997, 1998, 1999, 2000, 03, 04 by Ralf Baechle
* Copyright (C) 1999, 2000 Silicon Graphics, Inc.
* Copyright (C) 2007 Maciej W. Rozycki
+ * Copyright (C) 2014, Imagination Technologies Ltd.
*/
#ifndef _ASM_UACCESS_H
#define _ASM_UACCESS_H
@@ -13,6 +14,7 @@
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/thread_info.h>
+#include <asm/asm-eva.h>
/*
* The fs value determines whether argument validity checking should be
@@ -23,7 +25,11 @@
*/
#ifdef CONFIG_32BIT
-#define __UA_LIMIT 0x80000000UL
+#ifdef CONFIG_KVM_GUEST
+#define __UA_LIMIT 0x40000000UL
+#else
+#define __UA_LIMIT 0x80000000UL
+#endif
#define __UA_ADDR ".word"
#define __UA_LA "la"
@@ -55,8 +61,13 @@ extern u64 __ua_limit;
* address in this range it's the process's problem, not ours :-)
*/
+#ifdef CONFIG_KVM_GUEST
+#define KERNEL_DS ((mm_segment_t) { 0x80000000UL })
+#define USER_DS ((mm_segment_t) { 0xC0000000UL })
+#else
#define KERNEL_DS ((mm_segment_t) { 0UL })
#define USER_DS ((mm_segment_t) { __UA_LIMIT })
+#endif
#define VERIFY_READ 0
#define VERIFY_WRITE 1
@@ -87,12 +98,12 @@ extern u64 __ua_limit;
/*
* access_ok: - Checks if a user space pointer is valid
* @type: Type of access: %VERIFY_READ or %VERIFY_WRITE. Note that
- * %VERIFY_WRITE is a superset of %VERIFY_READ - if it is safe
- * to write to a block, it is always safe to read from it.
+ * %VERIFY_WRITE is a superset of %VERIFY_READ - if it is safe
+ * to write to a block, it is always safe to read from it.
* @addr: User space pointer to start of block to check
* @size: Size of block to check
*
- * Context: User context only. This function may sleep.
+ * Context: User context only. This function may sleep.
*
* Checks if a pointer to a block of memory in user space is valid.
*
@@ -124,10 +135,10 @@ extern u64 __ua_limit;
/*
* put_user: - Write a simple value into user space.
- * @x: Value to copy to user space.
+ * @x: Value to copy to user space.
* @ptr: Destination address, in user space.
*
- * Context: User context only. This function may sleep.
+ * Context: User context only. This function may sleep.
*
* This macro copies a single simple value from kernel space to user
* space. It supports simple types like char and int, but not larger
@@ -138,15 +149,15 @@ extern u64 __ua_limit;
*
* Returns zero on success, or -EFAULT on error.
*/
-#define put_user(x,ptr) \
+#define put_user(x,ptr) \
__put_user_check((x), (ptr), sizeof(*(ptr)))
/*
* get_user: - Get a simple variable from user space.
- * @x: Variable to store result.
+ * @x: Variable to store result.
* @ptr: Source address, in user space.
*
- * Context: User context only. This function may sleep.
+ * Context: User context only. This function may sleep.
*
* This macro copies a single simple variable from user space to kernel
* space. It supports simple types like char and int, but not larger
@@ -163,10 +174,10 @@ extern u64 __ua_limit;
/*
* __put_user: - Write a simple value into user space, with less checking.
- * @x: Value to copy to user space.
+ * @x: Value to copy to user space.
* @ptr: Destination address, in user space.
*
- * Context: User context only. This function may sleep.
+ * Context: User context only. This function may sleep.
*
* This macro copies a single simple value from kernel space to user
* space. It supports simple types like char and int, but not larger
@@ -185,10 +196,10 @@ extern u64 __ua_limit;
/*
* __get_user: - Get a simple variable from user space, with less checking.
- * @x: Variable to store result.
+ * @x: Variable to store result.
* @ptr: Source address, in user space.
*
- * Context: User context only. This function may sleep.
+ * Context: User context only. This function may sleep.
*
* This macro copies a single simple variable from user space to kernel
* space. It supports simple types like char and int, but not larger
@@ -213,11 +224,44 @@ struct __large_struct { unsigned long buf[100]; };
* Yuck. We need two variants, one for 64bit operation and one
* for 32 bit mode and old iron.
*/
+#ifndef CONFIG_EVA
+#define __get_kernel_common(val, size, ptr) __get_user_common(val, size, ptr)
+#else
+/*
+ * Kernel specific functions for EVA. We need to use normal load instructions
+ * to read data from kernel when operating in EVA mode. We use these macros to
+ * avoid redefining __get_user_asm for EVA.
+ */
+#undef _loadd
+#undef _loadw
+#undef _loadh
+#undef _loadb
+#ifdef CONFIG_32BIT
+#define _loadd _loadw
+#else
+#define _loadd(reg, addr) "ld " reg ", " addr
+#endif
+#define _loadw(reg, addr) "lw " reg ", " addr
+#define _loadh(reg, addr) "lh " reg ", " addr
+#define _loadb(reg, addr) "lb " reg ", " addr
+
+#define __get_kernel_common(val, size, ptr) \
+do { \
+ switch (size) { \
+ case 1: __get_data_asm(val, _loadb, ptr); break; \
+ case 2: __get_data_asm(val, _loadh, ptr); break; \
+ case 4: __get_data_asm(val, _loadw, ptr); break; \
+ case 8: __GET_DW(val, _loadd, ptr); break; \
+ default: __get_user_unknown(); break; \
+ } \
+} while (0)
+#endif
+
#ifdef CONFIG_32BIT
-#define __GET_USER_DW(val, ptr) __get_user_asm_ll32(val, ptr)
+#define __GET_DW(val, insn, ptr) __get_data_asm_ll32(val, insn, ptr)
#endif
#ifdef CONFIG_64BIT
-#define __GET_USER_DW(val, ptr) __get_user_asm(val, "ld", ptr)
+#define __GET_DW(val, insn, ptr) __get_data_asm(val, insn, ptr)
#endif
extern void __get_user_unknown(void);
@@ -225,10 +269,10 @@ extern void __get_user_unknown(void);
#define __get_user_common(val, size, ptr) \
do { \
switch (size) { \
- case 1: __get_user_asm(val, "lb", ptr); break; \
- case 2: __get_user_asm(val, "lh", ptr); break; \
- case 4: __get_user_asm(val, "lw", ptr); break; \
- case 8: __GET_USER_DW(val, ptr); break; \
+ case 1: __get_data_asm(val, user_lb, ptr); break; \
+ case 2: __get_data_asm(val, user_lh, ptr); break; \
+ case 4: __get_data_asm(val, user_lw, ptr); break; \
+ case 8: __GET_DW(val, user_ld, ptr); break; \
default: __get_user_unknown(); break; \
} \
} while (0)
@@ -237,8 +281,12 @@ do { \
({ \
int __gu_err; \
\
- __chk_user_ptr(ptr); \
- __get_user_common((x), size, ptr); \
+ if (segment_eq(get_fs(), get_ds())) { \
+ __get_kernel_common((x), size, ptr); \
+ } else { \
+ __chk_user_ptr(ptr); \
+ __get_user_common((x), size, ptr); \
+ } \
__gu_err; \
})
@@ -248,19 +296,24 @@ do { \
const __typeof__(*(ptr)) __user * __gu_ptr = (ptr); \
\
might_fault(); \
- if (likely(access_ok(VERIFY_READ, __gu_ptr, size))) \
- __get_user_common((x), size, __gu_ptr); \
+ if (likely(access_ok(VERIFY_READ, __gu_ptr, size))) { \
+ if (segment_eq(get_fs(), get_ds())) \
+ __get_kernel_common((x), size, __gu_ptr); \
+ else \
+ __get_user_common((x), size, __gu_ptr); \
+ } \
\
__gu_err; \
})
-#define __get_user_asm(val, insn, addr) \
+#define __get_data_asm(val, insn, addr) \
{ \
long __gu_tmp; \
\
__asm__ __volatile__( \
- "1: " insn " %1, %3 \n" \
+ "1: "insn("%1", "%3")" \n" \
"2: \n" \
+ " .insn \n" \
" .section .fixup,\"ax\" \n" \
"3: li %0, %4 \n" \
" j 2b \n" \
@@ -277,7 +330,7 @@ do { \
/*
* Get a long long 64 using 32 bit registers.
*/
-#define __get_user_asm_ll32(val, addr) \
+#define __get_data_asm_ll32(val, insn, addr) \
{ \
union { \
unsigned long long l; \
@@ -285,9 +338,11 @@ do { \
} __gu_tmp; \
\
__asm__ __volatile__( \
- "1: lw %1, (%3) \n" \
- "2: lw %D1, 4(%3) \n" \
- "3: .section .fixup,\"ax\" \n" \
+ "1: " insn("%1", "(%3)")" \n" \
+ "2: " insn("%D1", "4(%3)")" \n" \
+ "3: \n" \
+ " .insn \n" \
+ " .section .fixup,\"ax\" \n" \
"4: li %0, %4 \n" \
" move %1, $0 \n" \
" move %D1, $0 \n" \
@@ -303,30 +358,73 @@ do { \
(val) = __gu_tmp.t; \
}
+#ifndef CONFIG_EVA
+#define __put_kernel_common(ptr, size) __put_user_common(ptr, size)
+#else
+/*
+ * Kernel specific functions for EVA. We need to use normal load instructions
+ * to read data from kernel when operating in EVA mode. We use these macros to
+ * avoid redefining __get_data_asm for EVA.
+ */
+#undef _stored
+#undef _storew
+#undef _storeh
+#undef _storeb
+#ifdef CONFIG_32BIT
+#define _stored _storew
+#else
+#define _stored(reg, addr) "ld " reg ", " addr
+#endif
+
+#define _storew(reg, addr) "sw " reg ", " addr
+#define _storeh(reg, addr) "sh " reg ", " addr
+#define _storeb(reg, addr) "sb " reg ", " addr
+
+#define __put_kernel_common(ptr, size) \
+do { \
+ switch (size) { \
+ case 1: __put_data_asm(_storeb, ptr); break; \
+ case 2: __put_data_asm(_storeh, ptr); break; \
+ case 4: __put_data_asm(_storew, ptr); break; \
+ case 8: __PUT_DW(_stored, ptr); break; \
+ default: __put_user_unknown(); break; \
+ } \
+} while(0)
+#endif
+
/*
* Yuck. We need two variants, one for 64bit operation and one
* for 32 bit mode and old iron.
*/
#ifdef CONFIG_32BIT
-#define __PUT_USER_DW(ptr) __put_user_asm_ll32(ptr)
+#define __PUT_DW(insn, ptr) __put_data_asm_ll32(insn, ptr)
#endif
#ifdef CONFIG_64BIT
-#define __PUT_USER_DW(ptr) __put_user_asm("sd", ptr)
+#define __PUT_DW(insn, ptr) __put_data_asm(insn, ptr)
#endif
+#define __put_user_common(ptr, size) \
+do { \
+ switch (size) { \
+ case 1: __put_data_asm(user_sb, ptr); break; \
+ case 2: __put_data_asm(user_sh, ptr); break; \
+ case 4: __put_data_asm(user_sw, ptr); break; \
+ case 8: __PUT_DW(user_sd, ptr); break; \
+ default: __put_user_unknown(); break; \
+ } \
+} while (0)
+
#define __put_user_nocheck(x, ptr, size) \
({ \
__typeof__(*(ptr)) __pu_val; \
int __pu_err = 0; \
\
- __chk_user_ptr(ptr); \
__pu_val = (x); \
- switch (size) { \
- case 1: __put_user_asm("sb", ptr); break; \
- case 2: __put_user_asm("sh", ptr); break; \
- case 4: __put_user_asm("sw", ptr); break; \
- case 8: __PUT_USER_DW(ptr); break; \
- default: __put_user_unknown(); break; \
+ if (segment_eq(get_fs(), get_ds())) { \
+ __put_kernel_common(ptr, size); \
+ } else { \
+ __chk_user_ptr(ptr); \
+ __put_user_common(ptr, size); \
} \
__pu_err; \
})
@@ -339,22 +437,21 @@ do { \
\
might_fault(); \
if (likely(access_ok(VERIFY_WRITE, __pu_addr, size))) { \
- switch (size) { \
- case 1: __put_user_asm("sb", __pu_addr); break; \
- case 2: __put_user_asm("sh", __pu_addr); break; \
- case 4: __put_user_asm("sw", __pu_addr); break; \
- case 8: __PUT_USER_DW(__pu_addr); break; \
- default: __put_user_unknown(); break; \
- } \
+ if (segment_eq(get_fs(), get_ds())) \
+ __put_kernel_common(__pu_addr, size); \
+ else \
+ __put_user_common(__pu_addr, size); \
} \
+ \
__pu_err; \
})
-#define __put_user_asm(insn, ptr) \
+#define __put_data_asm(insn, ptr) \
{ \
__asm__ __volatile__( \
- "1: " insn " %z2, %3 # __put_user_asm\n" \
+ "1: "insn("%z2", "%3")" # __put_data_asm \n" \
"2: \n" \
+ " .insn \n" \
" .section .fixup,\"ax\" \n" \
"3: li %0, %4 \n" \
" j 2b \n" \
@@ -367,12 +464,13 @@ do { \
"i" (-EFAULT)); \
}
-#define __put_user_asm_ll32(ptr) \
+#define __put_data_asm_ll32(insn, ptr) \
{ \
__asm__ __volatile__( \
- "1: sw %2, (%3) # __put_user_asm_ll32 \n" \
- "2: sw %D2, 4(%3) \n" \
+ "1: "insn("%2", "(%3)")" # __put_data_asm_ll32 \n" \
+ "2: "insn("%D2", "4(%3)")" \n" \
"3: \n" \
+ " .insn \n" \
" .section .fixup,\"ax\" \n" \
"4: li %0, %4 \n" \
" j 3b \n" \
@@ -389,11 +487,16 @@ do { \
extern void __put_user_unknown(void);
/*
+ * ul{b,h,w} are macros and there are no equivalent macros for EVA.
+ * EVA unaligned access is handled in the ADE exception handler.
+ */
+#ifndef CONFIG_EVA
+/*
* put_user_unaligned: - Write a simple value into user space.
- * @x: Value to copy to user space.
+ * @x: Value to copy to user space.
* @ptr: Destination address, in user space.
*
- * Context: User context only. This function may sleep.
+ * Context: User context only. This function may sleep.
*
* This macro copies a single simple value from kernel space to user
* space. It supports simple types like char and int, but not larger
@@ -409,10 +512,10 @@ extern void __put_user_unknown(void);
/*
* get_user_unaligned: - Get a simple variable from user space.
- * @x: Variable to store result.
+ * @x: Variable to store result.
* @ptr: Source address, in user space.
*
- * Context: User context only. This function may sleep.
+ * Context: User context only. This function may sleep.
*
* This macro copies a single simple variable from user space to kernel
* space. It supports simple types like char and int, but not larger
@@ -429,10 +532,10 @@ extern void __put_user_unknown(void);
/*
* __put_user_unaligned: - Write a simple value into user space, with less checking.
- * @x: Value to copy to user space.
+ * @x: Value to copy to user space.
* @ptr: Destination address, in user space.
*
- * Context: User context only. This function may sleep.
+ * Context: User context only. This function may sleep.
*
* This macro copies a single simple value from kernel space to user
* space. It supports simple types like char and int, but not larger
@@ -451,10 +554,10 @@ extern void __put_user_unknown(void);
/*
* __get_user_unaligned: - Get a simple variable from user space, with less checking.
- * @x: Variable to store result.
+ * @x: Variable to store result.
* @ptr: Source address, in user space.
*
- * Context: User context only. This function may sleep.
+ * Context: User context only. This function may sleep.
*
* This macro copies a single simple variable from user space to kernel
* space. It supports simple types like char and int, but not larger
@@ -490,7 +593,7 @@ extern void __get_user_unaligned_unknown(void);
#define __get_user_unaligned_common(val, size, ptr) \
do { \
switch (size) { \
- case 1: __get_user_asm(val, "lb", ptr); break; \
+ case 1: __get_data_asm(val, "lb", ptr); break; \
case 2: __get_user_unaligned_asm(val, "ulh", ptr); break; \
case 4: __get_user_unaligned_asm(val, "ulw", ptr); break; \
case 8: __GET_USER_UNALIGNED_DW(val, ptr); break; \
@@ -517,13 +620,14 @@ do { \
__gu_err; \
})
-#define __get_user_unaligned_asm(val, insn, addr) \
+#define __get_data_unaligned_asm(val, insn, addr) \
{ \
long __gu_tmp; \
\
__asm__ __volatile__( \
"1: " insn " %1, %3 \n" \
"2: \n" \
+ " .insn \n" \
" .section .fixup,\"ax\" \n" \
"3: li %0, %4 \n" \
" j 2b \n" \
@@ -543,13 +647,15 @@ do { \
*/
#define __get_user_unaligned_asm_ll32(val, addr) \
{ \
- unsigned long long __gu_tmp; \
+ unsigned long long __gu_tmp; \
\
__asm__ __volatile__( \
"1: ulw %1, (%3) \n" \
"2: ulw %D1, 4(%3) \n" \
" move %0, $0 \n" \
- "3: .section .fixup,\"ax\" \n" \
+ "3: \n" \
+ " .insn \n" \
+ " .section .fixup,\"ax\" \n" \
"4: li %0, %4 \n" \
" move %1, $0 \n" \
" move %D1, $0 \n" \
@@ -577,19 +683,23 @@ do { \
#define __PUT_USER_UNALIGNED_DW(ptr) __put_user_unaligned_asm("usd", ptr)
#endif
+#define __put_user_unaligned_common(ptr, size) \
+do { \
+ switch (size) { \
+ case 1: __put_data_asm("sb", ptr); break; \
+ case 2: __put_user_unaligned_asm("ush", ptr); break; \
+ case 4: __put_user_unaligned_asm("usw", ptr); break; \
+ case 8: __PUT_USER_UNALIGNED_DW(ptr); break; \
+ default: __put_user_unaligned_unknown(); break; \
+} while (0)
+
#define __put_user_unaligned_nocheck(x,ptr,size) \
({ \
__typeof__(*(ptr)) __pu_val; \
int __pu_err = 0; \
\
__pu_val = (x); \
- switch (size) { \
- case 1: __put_user_asm("sb", ptr); break; \
- case 2: __put_user_unaligned_asm("ush", ptr); break; \
- case 4: __put_user_unaligned_asm("usw", ptr); break; \
- case 8: __PUT_USER_UNALIGNED_DW(ptr); break; \
- default: __put_user_unaligned_unknown(); break; \
- } \
+ __put_user_unaligned_common(ptr, size); \
__pu_err; \
})
@@ -599,15 +709,9 @@ do { \
__typeof__(*(ptr)) __pu_val = (x); \
int __pu_err = -EFAULT; \
\
- if (likely(access_ok(VERIFY_WRITE, __pu_addr, size))) { \
- switch (size) { \
- case 1: __put_user_asm("sb", __pu_addr); break; \
- case 2: __put_user_unaligned_asm("ush", __pu_addr); break; \
- case 4: __put_user_unaligned_asm("usw", __pu_addr); break; \
- case 8: __PUT_USER_UNALGINED_DW(__pu_addr); break; \
- default: __put_user_unaligned_unknown(); break; \
- } \
- } \
+ if (likely(access_ok(VERIFY_WRITE, __pu_addr, size))) \
+ __put_user_unaligned_common(__pu_addr, size); \
+ \
__pu_err; \
})
@@ -616,6 +720,7 @@ do { \
__asm__ __volatile__( \
"1: " insn " %z2, %3 # __put_user_unaligned_asm\n" \
"2: \n" \
+ " .insn \n" \
" .section .fixup,\"ax\" \n" \
"3: li %0, %4 \n" \
" j 2b \n" \
@@ -631,9 +736,10 @@ do { \
#define __put_user_unaligned_asm_ll32(ptr) \
{ \
__asm__ __volatile__( \
- "1: sw %2, (%3) # __put_user_unaligned_asm_ll32 \n" \
+ "1: sw %2, (%3) # __put_user_unaligned_asm_ll32 \n" \
"2: sw %D2, 4(%3) \n" \
"3: \n" \
+ " .insn \n" \
" .section .fixup,\"ax\" \n" \
"4: li %0, %4 \n" \
" j 3b \n" \
@@ -650,6 +756,7 @@ do { \
}
extern void __put_user_unaligned_unknown(void);
+#endif
/*
* We're generating jump to subroutines which will be outside the range of
@@ -658,7 +765,7 @@ extern void __put_user_unaligned_unknown(void);
#ifdef MODULE
#define __MODULE_JAL(destination) \
".set\tnoat\n\t" \
- __UA_LA "\t$1, " #destination "\n\t" \
+ __UA_LA "\t$1, " #destination "\n\t" \
"jalr\t$1\n\t" \
".set\tat\n\t"
#else
@@ -674,6 +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"); \
@@ -687,18 +795,23 @@ extern size_t __copy_user(void *__to, const void *__from, size_t __n);
__MODULE_JAL(__copy_user) \
: "+r" (__cu_to_r), "+r" (__cu_from_r), "+r" (__cu_len_r) \
: \
- : "$8", "$9", "$10", "$11", "$12", "$15", "$24", "$31", \
+ : "$8", "$9", "$10", "$11", "$12", "$14", "$15", "$24", "$31", \
DADDI_SCRATCH, "memory"); \
__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.
+ * @to: Destination address, in user space.
* @from: Source address, in kernel space.
- * @n: Number of bytes to copy.
+ * @n: Number of bytes to copy.
*
- * Context: User context only. This function may sleep.
+ * Context: User context only. This function may sleep.
*
* Copy data from kernel space to user space. Caller must check
* the specified block with access_ok() before calling this function.
@@ -716,7 +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; \
})
@@ -731,7 +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; \
})
@@ -744,18 +867,24 @@ 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; \
})
/*
* copy_to_user: - Copy a block of data into user space.
- * @to: Destination address, in user space.
+ * @to: Destination address, in user space.
* @from: Source address, in kernel space.
- * @n: Number of bytes to copy.
+ * @n: Number of bytes to copy.
*
- * Context: User context only. This function may sleep.
+ * Context: User context only. This function may sleep.
*
* Copy data from kernel space to user space.
*
@@ -771,14 +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"); \
@@ -797,11 +935,22 @@ extern size_t __copy_user_inatomic(void *__to, const void *__from, size_t __n);
".set\treorder" \
: "+r" (__cu_to_r), "+r" (__cu_from_r), "+r" (__cu_len_r) \
: \
- : "$8", "$9", "$10", "$11", "$12", "$15", "$24", "$31", \
+ : "$8", "$9", "$10", "$11", "$12", "$14", "$15", "$24", "$31", \
DADDI_SCRATCH, "memory"); \
__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"); \
@@ -820,18 +969,109 @@ extern size_t __copy_user_inatomic(void *__to, const void *__from, size_t __n);
".set\treorder" \
: "+r" (__cu_to_r), "+r" (__cu_from_r), "+r" (__cu_len_r) \
: \
- : "$8", "$9", "$10", "$11", "$12", "$15", "$24", "$31", \
+ : "$8", "$9", "$10", "$11", "$12", "$14", "$15", "$24", "$31", \
+ DADDI_SCRATCH, "memory"); \
+ __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.
+ * @to: Destination address, in kernel space.
* @from: Source address, in user space.
- * @n: Number of bytes to copy.
+ * @n: Number of bytes to copy.
*
- * Context: User context only. This function may sleep.
+ * Context: User context only. This function may sleep.
*
* Copy data from user space to kernel space. Caller must check
* the specified block with access_ok() before calling this function.
@@ -853,17 +1093,17 @@ extern size_t __copy_user_inatomic(void *__to, const void *__from, size_t __n);
__cu_len = (n); \
might_fault(); \
__cu_len = __invoke_copy_from_user(__cu_to, __cu_from, \
- __cu_len); \
+ __cu_len); \
__cu_len; \
})
/*
* copy_from_user: - Copy a block of data from user space.
- * @to: Destination address, in kernel space.
+ * @to: Destination address, in kernel space.
* @from: Source address, in user space.
- * @n: Number of bytes to copy.
+ * @n: Number of bytes to copy.
*
- * Context: User context only. This function may sleep.
+ * Context: User context only. This function may sleep.
*
* Copy data from user space to kernel space.
*
@@ -882,10 +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; \
})
@@ -899,9 +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; \
})
@@ -914,19 +1166,25 @@ 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; \
})
/*
* __clear_user: - Zero a block of memory in user space, with less checking.
- * @to: Destination address, in user space.
- * @n: Number of bytes to zero.
+ * @to: Destination address, in user space.
+ * @n: Number of bytes to zero.
*
* Zero a block of memory in user space. Caller must check
* the specified block with access_ok() before calling this function.
@@ -966,7 +1224,7 @@ __clear_user(void __user *addr, __kernel_size_t size)
/*
* __strncpy_from_user: - Copy a NUL terminated string from userspace, with less checking.
* @dst: Destination address, in kernel space. This buffer must be at
- * least @count bytes long.
+ * least @count bytes long.
* @src: Source address, in user space.
* @count: Maximum number of bytes to copy, including the trailing NUL.
*
@@ -988,16 +1246,28 @@ __strncpy_from_user(char *__to, const char __user *__from, long __len)
{
long res;
- might_fault();
- __asm__ __volatile__(
- "move\t$4, %1\n\t"
- "move\t$5, %2\n\t"
- "move\t$6, %3\n\t"
- __MODULE_JAL(__strncpy_from_user_nocheck_asm)
- "move\t%0, $2"
- : "=r" (res)
- : "r" (__to), "r" (__from), "r" (__len)
- : "$2", "$3", "$4", "$5", "$6", __UA_t0, "$31", "memory");
+ if (segment_eq(get_fs(), get_ds())) {
+ __asm__ __volatile__(
+ "move\t$4, %1\n\t"
+ "move\t$5, %2\n\t"
+ "move\t$6, %3\n\t"
+ __MODULE_JAL(__strncpy_from_kernel_nocheck_asm)
+ "move\t%0, $2"
+ : "=r" (res)
+ : "r" (__to), "r" (__from), "r" (__len)
+ : "$2", "$3", "$4", "$5", "$6", __UA_t0, "$31", "memory");
+ } else {
+ might_fault();
+ __asm__ __volatile__(
+ "move\t$4, %1\n\t"
+ "move\t$5, %2\n\t"
+ "move\t$6, %3\n\t"
+ __MODULE_JAL(__strncpy_from_user_nocheck_asm)
+ "move\t%0, $2"
+ : "=r" (res)
+ : "r" (__to), "r" (__from), "r" (__len)
+ : "$2", "$3", "$4", "$5", "$6", __UA_t0, "$31", "memory");
+ }
return res;
}
@@ -1005,7 +1275,7 @@ __strncpy_from_user(char *__to, const char __user *__from, long __len)
/*
* strncpy_from_user: - Copy a NUL terminated string from userspace.
* @dst: Destination address, in kernel space. This buffer must be at
- * least @count bytes long.
+ * least @count bytes long.
* @src: Source address, in user space.
* @count: Maximum number of bytes to copy, including the trailing NUL.
*
@@ -1025,16 +1295,28 @@ strncpy_from_user(char *__to, const char __user *__from, long __len)
{
long res;
- might_fault();
- __asm__ __volatile__(
- "move\t$4, %1\n\t"
- "move\t$5, %2\n\t"
- "move\t$6, %3\n\t"
- __MODULE_JAL(__strncpy_from_user_asm)
- "move\t%0, $2"
- : "=r" (res)
- : "r" (__to), "r" (__from), "r" (__len)
- : "$2", "$3", "$4", "$5", "$6", __UA_t0, "$31", "memory");
+ if (segment_eq(get_fs(), get_ds())) {
+ __asm__ __volatile__(
+ "move\t$4, %1\n\t"
+ "move\t$5, %2\n\t"
+ "move\t$6, %3\n\t"
+ __MODULE_JAL(__strncpy_from_kernel_asm)
+ "move\t%0, $2"
+ : "=r" (res)
+ : "r" (__to), "r" (__from), "r" (__len)
+ : "$2", "$3", "$4", "$5", "$6", __UA_t0, "$31", "memory");
+ } else {
+ might_fault();
+ __asm__ __volatile__(
+ "move\t$4, %1\n\t"
+ "move\t$5, %2\n\t"
+ "move\t$6, %3\n\t"
+ __MODULE_JAL(__strncpy_from_user_asm)
+ "move\t%0, $2"
+ : "=r" (res)
+ : "r" (__to), "r" (__from), "r" (__len)
+ : "$2", "$3", "$4", "$5", "$6", __UA_t0, "$31", "memory");
+ }
return res;
}
@@ -1044,14 +1326,24 @@ static inline long __strlen_user(const char __user *s)
{
long res;
- might_fault();
- __asm__ __volatile__(
- "move\t$4, %1\n\t"
- __MODULE_JAL(__strlen_user_nocheck_asm)
- "move\t%0, $2"
- : "=r" (res)
- : "r" (s)
- : "$2", "$4", __UA_t0, "$31");
+ if (segment_eq(get_fs(), get_ds())) {
+ __asm__ __volatile__(
+ "move\t$4, %1\n\t"
+ __MODULE_JAL(__strlen_kernel_nocheck_asm)
+ "move\t%0, $2"
+ : "=r" (res)
+ : "r" (s)
+ : "$2", "$4", __UA_t0, "$31");
+ } else {
+ might_fault();
+ __asm__ __volatile__(
+ "move\t$4, %1\n\t"
+ __MODULE_JAL(__strlen_user_nocheck_asm)
+ "move\t%0, $2"
+ : "=r" (res)
+ : "r" (s)
+ : "$2", "$4", __UA_t0, "$31");
+ }
return res;
}
@@ -1060,7 +1352,7 @@ static inline long __strlen_user(const char __user *s)
* strlen_user: - Get the size of a string in user space.
* @str: The string to measure.
*
- * Context: User context only. This function may sleep.
+ * Context: User context only. This function may sleep.
*
* Get the size of a NUL-terminated string in user space.
*
@@ -1074,14 +1366,24 @@ static inline long strlen_user(const char __user *s)
{
long res;
- might_fault();
- __asm__ __volatile__(
- "move\t$4, %1\n\t"
- __MODULE_JAL(__strlen_user_asm)
- "move\t%0, $2"
- : "=r" (res)
- : "r" (s)
- : "$2", "$4", __UA_t0, "$31");
+ if (segment_eq(get_fs(), get_ds())) {
+ __asm__ __volatile__(
+ "move\t$4, %1\n\t"
+ __MODULE_JAL(__strlen_kernel_asm)
+ "move\t%0, $2"
+ : "=r" (res)
+ : "r" (s)
+ : "$2", "$4", __UA_t0, "$31");
+ } else {
+ might_fault();
+ __asm__ __volatile__(
+ "move\t$4, %1\n\t"
+ __MODULE_JAL(__strlen_kernel_asm)
+ "move\t%0, $2"
+ : "=r" (res)
+ : "r" (s)
+ : "$2", "$4", __UA_t0, "$31");
+ }
return res;
}
@@ -1091,15 +1393,26 @@ static inline long __strnlen_user(const char __user *s, long n)
{
long res;
- might_fault();
- __asm__ __volatile__(
- "move\t$4, %1\n\t"
- "move\t$5, %2\n\t"
- __MODULE_JAL(__strnlen_user_nocheck_asm)
- "move\t%0, $2"
- : "=r" (res)
- : "r" (s), "r" (n)
- : "$2", "$4", "$5", __UA_t0, "$31");
+ if (segment_eq(get_fs(), get_ds())) {
+ __asm__ __volatile__(
+ "move\t$4, %1\n\t"
+ "move\t$5, %2\n\t"
+ __MODULE_JAL(__strnlen_kernel_nocheck_asm)
+ "move\t%0, $2"
+ : "=r" (res)
+ : "r" (s), "r" (n)
+ : "$2", "$4", "$5", __UA_t0, "$31");
+ } else {
+ might_fault();
+ __asm__ __volatile__(
+ "move\t$4, %1\n\t"
+ "move\t$5, %2\n\t"
+ __MODULE_JAL(__strnlen_user_nocheck_asm)
+ "move\t%0, $2"
+ : "=r" (res)
+ : "r" (s), "r" (n)
+ : "$2", "$4", "$5", __UA_t0, "$31");
+ }
return res;
}
@@ -1108,7 +1421,7 @@ static inline long __strnlen_user(const char __user *s, long n)
* strlen_user: - Get the size of a string in user space.
* @str: The string to measure.
*
- * Context: User context only. This function may sleep.
+ * Context: User context only. This function may sleep.
*
* Get the size of a NUL-terminated string in user space.
*
@@ -1123,14 +1436,25 @@ static inline long strnlen_user(const char __user *s, long n)
long res;
might_fault();
- __asm__ __volatile__(
- "move\t$4, %1\n\t"
- "move\t$5, %2\n\t"
- __MODULE_JAL(__strnlen_user_asm)
- "move\t%0, $2"
- : "=r" (res)
- : "r" (s), "r" (n)
- : "$2", "$4", "$5", __UA_t0, "$31");
+ if (segment_eq(get_fs(), get_ds())) {
+ __asm__ __volatile__(
+ "move\t$4, %1\n\t"
+ "move\t$5, %2\n\t"
+ __MODULE_JAL(__strnlen_kernel_asm)
+ "move\t%0, $2"
+ : "=r" (res)
+ : "r" (s), "r" (n)
+ : "$2", "$4", "$5", __UA_t0, "$31");
+ } else {
+ __asm__ __volatile__(
+ "move\t$4, %1\n\t"
+ "move\t$5, %2\n\t"
+ __MODULE_JAL(__strnlen_user_asm)
+ "move\t%0, $2"
+ : "=r" (res)
+ : "r" (s), "r" (n)
+ : "$2", "$4", "$5", __UA_t0, "$31");
+ }
return res;
}
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-03 18:28:56 +0000