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author | Markos Chandras <markos.chandras@imgtec.com> | 2013-12-11 11:25:33 +0000 |
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committer | Ralf Baechle <ralf@linux-mips.org> | 2014-03-26 23:09:16 +0100 |
commit | ac1d8590d3ae855d747b12c9e85dfb40bda709e4 (patch) | |
tree | 553961aa4c6a87975a85ebe60355c14cea0fae13 /arch/mips | |
parent | 18e900185b3ad75a04ee70ea291f71540e5f80e6 (diff) | |
download | linux-ac1d8590d3ae855d747b12c9e85dfb40bda709e4.tar.bz2 |
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>
Diffstat (limited to 'arch/mips')
-rw-r--r-- | arch/mips/include/asm/uaccess.h | 133 |
1 files changed, 109 insertions, 24 deletions
diff --git a/arch/mips/include/asm/uaccess.h b/arch/mips/include/asm/uaccess.h index 9c6f5cec3e82..499080447540 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 @@ -222,11 +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_user_asm(val, _loadb, ptr); break; \ + case 2: __get_user_asm(val, _loadh, ptr); break; \ + case 4: __get_user_asm(val, _loadw, ptr); break; \ + case 8: __GET_USER_DW(val, _loadd, ptr); break; \ + default: __get_user_unknown(); break; \ + } \ +} while (0) +#endif + #ifdef CONFIG_32BIT #define __GET_USER_DW(val, insn, ptr) __get_user_asm_ll32(val, insn, ptr) #endif #ifdef CONFIG_64BIT -#define __GET_USER_DW(val, insn, ptr) __get_user_asm(val, "ld", ptr) +#define __GET_USER_DW(val, insn, ptr) __get_user_asm(val, insn, ptr) #endif extern void __get_user_unknown(void); @@ -234,10 +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, "lw", ptr); break; \ + case 1: __get_user_asm(val, user_lb, ptr); break; \ + case 2: __get_user_asm(val, user_lh, ptr); break; \ + case 4: __get_user_asm(val, user_lw, ptr); break; \ + case 8: __GET_USER_DW(val, user_ld, ptr); break; \ default: __get_user_unknown(); break; \ } \ } while (0) @@ -246,8 +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; \ }) @@ -257,8 +296,12 @@ 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; \ }) @@ -268,7 +311,7 @@ do { \ long __gu_tmp; \ \ __asm__ __volatile__( \ - "1: " insn " %1, %3 \n" \ + "1: "insn("%1", "%3")" \n" \ "2: \n" \ " .insn \n" \ " .section .fixup,\"ax\" \n" \ @@ -295,8 +338,8 @@ do { \ } __gu_tmp; \ \ __asm__ __volatile__( \ - "1: " insn " %1, (%3) \n" \ - "2: " insn " %D1, 4(%3) \n" \ + "1: " insn("%1", "(%3)")" \n" \ + "2: " insn("%D1", "4(%3)")" \n" \ "3: \n" \ " .insn \n" \ " .section .fixup,\"ax\" \n" \ @@ -315,6 +358,40 @@ 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_user_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_user_asm(_storeb, ptr); break; \ + case 2: __put_user_asm(_storeh, ptr); break; \ + case 4: __put_user_asm(_storew, ptr); break; \ + case 8: __PUT_USER_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. @@ -323,16 +400,16 @@ do { \ #define __PUT_USER_DW(insn, ptr) __put_user_asm_ll32(insn, ptr) #endif #ifdef CONFIG_64BIT -#define __PUT_USER_DW(insn, ptr) __put_user_asm("sd", ptr) +#define __PUT_USER_DW(insn, ptr) __put_user_asm(insn, ptr) #endif #define __put_user_common(ptr, size) \ do { \ 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("sw", ptr); break; \ + case 1: __put_user_asm(user_sb, ptr); break; \ + case 2: __put_user_asm(user_sh, ptr); break; \ + case 4: __put_user_asm(user_sw, ptr); break; \ + case 8: __PUT_USER_DW(user_sd, ptr); break; \ default: __put_user_unknown(); break; \ } \ } while (0) @@ -342,9 +419,13 @@ do { \ __typeof__(*(ptr)) __pu_val; \ int __pu_err = 0; \ \ - __chk_user_ptr(ptr); \ __pu_val = (x); \ - __put_user_common(ptr, size); \ + if (segment_eq(get_fs(), get_ds())) { \ + __put_kernel_common(ptr, size); \ + } else { \ + __chk_user_ptr(ptr); \ + __put_user_common(ptr, size); \ + } \ __pu_err; \ }) @@ -355,8 +436,12 @@ do { \ int __pu_err = -EFAULT; \ \ might_fault(); \ - if (likely(access_ok(VERIFY_WRITE, __pu_addr, size))) \ - __put_user_common(__pu_addr, size); \ + if (likely(access_ok(VERIFY_WRITE, __pu_addr, size))) { \ + if (segment_eq(get_fs(), get_ds())) \ + __put_kernel_common(__pu_addr, size); \ + else \ + __put_user_common(__pu_addr, size); \ + } \ \ __pu_err; \ }) @@ -364,7 +449,7 @@ do { \ #define __put_user_asm(insn, ptr) \ { \ __asm__ __volatile__( \ - "1: " insn " %z2, %3 # __put_user_asm\n" \ + "1: "insn("%z2", "%3")" # __put_user_asm \n" \ "2: \n" \ " .insn \n" \ " .section .fixup,\"ax\" \n" \ @@ -382,8 +467,8 @@ do { \ #define __put_user_asm_ll32(insn, ptr) \ { \ __asm__ __volatile__( \ - "1: " insn " %2, (%3)# __put_user_asm_ll32 \n" \ - "2: " insn " %D2, 4(%3) \n" \ + "1: "insn("%2", "(%3)")" # __put_user_asm_ll32 \n" \ + "2: "insn("%D2", "4(%3)")" \n" \ "3: \n" \ " .insn \n" \ " .section .fixup,\"ax\" \n" \ |