forked from mirrors/linux
MIPS: asm: uaccess: Use EVA instructions wrappers
Use the EVA instruction wrappers from asm.h to perform read/write operations from userland. Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
This commit is contained in:
Markos Chandras
Ralf Baechle
parent
18e900185b
commit
ac1d8590d3
1 changed files with 109 additions and 24 deletions
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@ -6,6 +6,7 @@
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* Copyright (C) 1996, 1997, 1998, 1999, 2000, 03, 04 by Ralf Baechle
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* Copyright (C) 1999, 2000 Silicon Graphics, Inc.
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* Copyright (C) 2007 Maciej W. Rozycki
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* Copyright (C) 2014, Imagination Technologies Ltd.
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*/
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#ifndef _ASM_UACCESS_H
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#define _ASM_UACCESS_H
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@ -13,6 +14,7 @@
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/thread_info.h>
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#include <asm/asm-eva.h>
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/*
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* The fs value determines whether argument validity checking should be
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@ -222,11 +224,44 @@ struct __large_struct { unsigned long buf[100]; };
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* Yuck. We need two variants, one for 64bit operation and one
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* for 32 bit mode and old iron.
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*/
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#ifndef CONFIG_EVA
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#define __get_kernel_common(val, size, ptr) __get_user_common(val, size, ptr)
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#else
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/*
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* Kernel specific functions for EVA. We need to use normal load instructions
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* to read data from kernel when operating in EVA mode. We use these macros to
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* avoid redefining __get_user_asm for EVA.
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*/
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#undef _loadd
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#undef _loadw
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#undef _loadh
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#undef _loadb
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#ifdef CONFIG_32BIT
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#define _loadd _loadw
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#else
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#define _loadd(reg, addr) "ld " reg ", " addr
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#endif
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#define _loadw(reg, addr) "lw " reg ", " addr
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#define _loadh(reg, addr) "lh " reg ", " addr
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#define _loadb(reg, addr) "lb " reg ", " addr
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#define __get_kernel_common(val, size, ptr) \
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do { \
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switch (size) { \
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case 1: __get_user_asm(val, _loadb, ptr); break; \
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case 2: __get_user_asm(val, _loadh, ptr); break; \
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case 4: __get_user_asm(val, _loadw, ptr); break; \
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case 8: __GET_USER_DW(val, _loadd, ptr); break; \
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default: __get_user_unknown(); break; \
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} \
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} while (0)
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#endif
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#ifdef CONFIG_32BIT
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#define __GET_USER_DW(val, insn, ptr) __get_user_asm_ll32(val, insn, ptr)
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#endif
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#ifdef CONFIG_64BIT
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#define __GET_USER_DW(val, insn, ptr) __get_user_asm(val, "ld", ptr)
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#define __GET_USER_DW(val, insn, ptr) __get_user_asm(val, insn, ptr)
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#endif
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extern void __get_user_unknown(void);
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@ -234,10 +269,10 @@ extern void __get_user_unknown(void);
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#define __get_user_common(val, size, ptr) \
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do { \
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switch (size) { \
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case 1: __get_user_asm(val, "lb", ptr); break; \
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case 2: __get_user_asm(val, "lh", ptr); break; \
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case 4: __get_user_asm(val, "lw", ptr); break; \
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case 8: __GET_USER_DW(val, "lw", ptr); break; \
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case 1: __get_user_asm(val, user_lb, ptr); break; \
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case 2: __get_user_asm(val, user_lh, ptr); break; \
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case 4: __get_user_asm(val, user_lw, ptr); break; \
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case 8: __GET_USER_DW(val, user_ld, ptr); break; \
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default: __get_user_unknown(); break; \
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} \
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} while (0)
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@ -246,8 +281,12 @@ do { \
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({ \
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int __gu_err; \
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\
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__chk_user_ptr(ptr); \
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__get_user_common((x), size, ptr); \
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if (segment_eq(get_fs(), get_ds())) { \
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__get_kernel_common((x), size, ptr); \
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} else { \
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__chk_user_ptr(ptr); \
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__get_user_common((x), size, ptr); \
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} \
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__gu_err; \
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})
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@ -257,8 +296,12 @@ do { \
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const __typeof__(*(ptr)) __user * __gu_ptr = (ptr); \
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\
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might_fault(); \
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if (likely(access_ok(VERIFY_READ, __gu_ptr, size))) \
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__get_user_common((x), size, __gu_ptr); \
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if (likely(access_ok(VERIFY_READ, __gu_ptr, size))) { \
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if (segment_eq(get_fs(), get_ds())) \
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__get_kernel_common((x), size, __gu_ptr); \
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else \
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__get_user_common((x), size, __gu_ptr); \
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} \
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\
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__gu_err; \
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})
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@ -268,7 +311,7 @@ do { \
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long __gu_tmp; \
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\
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__asm__ __volatile__( \
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"1: " insn " %1, %3 \n" \
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"1: "insn("%1", "%3")" \n" \
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"2: \n" \
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" .insn \n" \
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" .section .fixup,\"ax\" \n" \
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@ -295,8 +338,8 @@ do { \
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} __gu_tmp; \
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\
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__asm__ __volatile__( \
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"1: " insn " %1, (%3) \n" \
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"2: " insn " %D1, 4(%3) \n" \
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"1: " insn("%1", "(%3)")" \n" \
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"2: " insn("%D1", "4(%3)")" \n" \
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"3: \n" \
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" .insn \n" \
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" .section .fixup,\"ax\" \n" \
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@ -315,6 +358,40 @@ do { \
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(val) = __gu_tmp.t; \
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}
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#ifndef CONFIG_EVA
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#define __put_kernel_common(ptr, size) __put_user_common(ptr, size)
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#else
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/*
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* Kernel specific functions for EVA. We need to use normal load instructions
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* to read data from kernel when operating in EVA mode. We use these macros to
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* avoid redefining __get_user_asm for EVA.
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*/
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#undef _stored
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#undef _storew
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#undef _storeh
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#undef _storeb
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#ifdef CONFIG_32BIT
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#define _stored _storew
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#else
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#define _stored(reg, addr) "ld " reg ", " addr
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#endif
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#define _storew(reg, addr) "sw " reg ", " addr
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#define _storeh(reg, addr) "sh " reg ", " addr
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#define _storeb(reg, addr) "sb " reg ", " addr
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#define __put_kernel_common(ptr, size) \
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do { \
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switch (size) { \
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case 1: __put_user_asm(_storeb, ptr); break; \
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case 2: __put_user_asm(_storeh, ptr); break; \
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case 4: __put_user_asm(_storew, ptr); break; \
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case 8: __PUT_USER_DW(_stored, ptr); break; \
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default: __put_user_unknown(); break; \
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} \
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} while(0)
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#endif
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/*
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* Yuck. We need two variants, one for 64bit operation and one
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* for 32 bit mode and old iron.
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@ -323,16 +400,16 @@ do { \
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#define __PUT_USER_DW(insn, ptr) __put_user_asm_ll32(insn, ptr)
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#endif
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#ifdef CONFIG_64BIT
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#define __PUT_USER_DW(insn, ptr) __put_user_asm("sd", ptr)
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#define __PUT_USER_DW(insn, ptr) __put_user_asm(insn, ptr)
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#endif
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#define __put_user_common(ptr, size) \
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do { \
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switch (size) { \
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case 1: __put_user_asm("sb", ptr); break; \
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case 2: __put_user_asm("sh", ptr); break; \
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case 4: __put_user_asm("sw", ptr); break; \
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case 8: __PUT_USER_DW("sw", ptr); break; \
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case 1: __put_user_asm(user_sb, ptr); break; \
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case 2: __put_user_asm(user_sh, ptr); break; \
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case 4: __put_user_asm(user_sw, ptr); break; \
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case 8: __PUT_USER_DW(user_sd, ptr); break; \
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default: __put_user_unknown(); break; \
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} \
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} while (0)
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@ -342,9 +419,13 @@ do { \
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__typeof__(*(ptr)) __pu_val; \
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int __pu_err = 0; \
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\
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__chk_user_ptr(ptr); \
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__pu_val = (x); \
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__put_user_common(ptr, size); \
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if (segment_eq(get_fs(), get_ds())) { \
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__put_kernel_common(ptr, size); \
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} else { \
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__chk_user_ptr(ptr); \
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__put_user_common(ptr, size); \
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} \
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__pu_err; \
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})
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@ -355,8 +436,12 @@ do { \
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int __pu_err = -EFAULT; \
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\
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might_fault(); \
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if (likely(access_ok(VERIFY_WRITE, __pu_addr, size))) \
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__put_user_common(__pu_addr, size); \
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if (likely(access_ok(VERIFY_WRITE, __pu_addr, size))) { \
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if (segment_eq(get_fs(), get_ds())) \
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__put_kernel_common(__pu_addr, size); \
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else \
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__put_user_common(__pu_addr, size); \
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} \
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\
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__pu_err; \
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})
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@ -364,7 +449,7 @@ do { \
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#define __put_user_asm(insn, ptr) \
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{ \
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__asm__ __volatile__( \
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"1: " insn " %z2, %3 # __put_user_asm\n" \
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"1: "insn("%z2", "%3")" # __put_user_asm \n" \
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"2: \n" \
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" .insn \n" \
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" .section .fixup,\"ax\" \n" \
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@ -382,8 +467,8 @@ do { \
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#define __put_user_asm_ll32(insn, ptr) \
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{ \
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__asm__ __volatile__( \
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"1: " insn " %2, (%3)# __put_user_asm_ll32 \n" \
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"2: " insn " %D2, 4(%3) \n" \
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"1: "insn("%2", "(%3)")" # __put_user_asm_ll32 \n" \
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"2: "insn("%D2", "4(%3)")" \n" \
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"3: \n" \
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" .insn \n" \
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" .section .fixup,\"ax\" \n" \
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