diff options
Diffstat (limited to 'arch/xtensa/include/asm/uaccess.h')
| -rw-r--r-- | arch/xtensa/include/asm/uaccess.h | 142 |
1 files changed, 0 insertions, 142 deletions
diff --git a/arch/xtensa/include/asm/uaccess.h b/arch/xtensa/include/asm/uaccess.h index de72ba558d8d..848a3d736bcb 100644 --- a/arch/xtensa/include/asm/uaccess.h +++ b/arch/xtensa/include/asm/uaccess.h @@ -17,153 +17,12 @@ #define _XTENSA_UACCESS_H #include <linux/errno.h> -#ifndef __ASSEMBLY__ #include <linux/prefetch.h> -#endif #include <asm/types.h> #define VERIFY_READ 0 #define VERIFY_WRITE 1 -#ifdef __ASSEMBLY__ - -#include <asm/current.h> -#include <asm/asm-offsets.h> -#include <asm/processor.h> - -/* - * These assembly macros mirror the C macros that follow below. They - * should always have identical functionality. See - * arch/xtensa/kernel/sys.S for usage. - */ - -#define KERNEL_DS 0 -#define USER_DS 1 - -#define get_ds (KERNEL_DS) - -/* - * get_fs reads current->thread.current_ds into a register. - * On Entry: - * <ad> anything - * <sp> stack - * On Exit: - * <ad> contains current->thread.current_ds - */ - .macro get_fs ad, sp - GET_CURRENT(\ad,\sp) -#if THREAD_CURRENT_DS > 1020 - addi \ad, \ad, TASK_THREAD - l32i \ad, \ad, THREAD_CURRENT_DS - TASK_THREAD -#else - l32i \ad, \ad, THREAD_CURRENT_DS -#endif - .endm - -/* - * set_fs sets current->thread.current_ds to some value. - * On Entry: - * <at> anything (temp register) - * <av> value to write - * <sp> stack - * On Exit: - * <at> destroyed (actually, current) - * <av> preserved, value to write - */ - .macro set_fs at, av, sp - GET_CURRENT(\at,\sp) - s32i \av, \at, THREAD_CURRENT_DS - .endm - -/* - * kernel_ok determines whether we should bypass addr/size checking. - * See the equivalent C-macro version below for clarity. - * On success, kernel_ok branches to a label indicated by parameter - * <success>. This implies that the macro falls through to the next - * insruction on an error. - * - * Note that while this macro can be used independently, we designed - * in for optimal use in the access_ok macro below (i.e., we fall - * through on error). - * - * On Entry: - * <at> anything (temp register) - * <success> label to branch to on success; implies - * fall-through macro on error - * <sp> stack pointer - * On Exit: - * <at> destroyed (actually, current->thread.current_ds) - */ - -#if ((KERNEL_DS != 0) || (USER_DS == 0)) -# error Assembly macro kernel_ok fails -#endif - .macro kernel_ok at, sp, success - get_fs \at, \sp - beqz \at, \success - .endm - -/* - * user_ok determines whether the access to user-space memory is allowed. - * See the equivalent C-macro version below for clarity. - * - * On error, user_ok branches to a label indicated by parameter - * <error>. This implies that the macro falls through to the next - * instruction on success. - * - * Note that while this macro can be used independently, we designed - * in for optimal use in the access_ok macro below (i.e., we fall - * through on success). - * - * On Entry: - * <aa> register containing memory address - * <as> register containing memory size - * <at> temp register - * <error> label to branch to on error; implies fall-through - * macro on success - * On Exit: - * <aa> preserved - * <as> preserved - * <at> destroyed (actually, (TASK_SIZE + 1 - size)) - */ - .macro user_ok aa, as, at, error - movi \at, __XTENSA_UL_CONST(TASK_SIZE) - bgeu \as, \at, \error - sub \at, \at, \as - bgeu \aa, \at, \error - .endm - -/* - * access_ok determines whether a memory access is allowed. See the - * equivalent C-macro version below for clarity. - * - * On error, access_ok branches to a label indicated by parameter - * <error>. This implies that the macro falls through to the next - * instruction on success. - * - * Note that we assume success is the common case, and we optimize the - * branch fall-through case on success. - * - * On Entry: - * <aa> register containing memory address - * <as> register containing memory size - * <at> temp register - * <sp> - * <error> label to branch to on error; implies fall-through - * macro on success - * On Exit: - * <aa> preserved - * <as> preserved - * <at> destroyed - */ - .macro access_ok aa, as, at, sp, error - kernel_ok \at, \sp, .Laccess_ok_\@ - user_ok \aa, \as, \at, \error -.Laccess_ok_\@: - .endm - -#else /* __ASSEMBLY__ not defined */ - #include <linux/sched.h> /* @@ -495,5 +354,4 @@ struct exception_table_entry unsigned long insn, fixup; }; -#endif /* __ASSEMBLY__ */ #endif /* _XTENSA_UACCESS_H */ |