diff options
Diffstat (limited to 'arch/tile/lib/memcpy_user_64.c')
-rw-r--r-- | arch/tile/lib/memcpy_user_64.c | 85 |
1 files changed, 0 insertions, 85 deletions
diff --git a/arch/tile/lib/memcpy_user_64.c b/arch/tile/lib/memcpy_user_64.c deleted file mode 100644 index a3fea9f..0000000 --- a/arch/tile/lib/memcpy_user_64.c +++ /dev/null @@ -1,85 +0,0 @@ -/* - * Copyright 2011 Tilera Corporation. All Rights Reserved. - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License - * as published by the Free Software Foundation, version 2. - * - * This program is distributed in the hope that it will be useful, but - * WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or - * NON INFRINGEMENT. See the GNU General Public License for - * more details. - * - * Do memcpy(), but trap and return "n" when a load or store faults. - * - * Note: this idiom only works when memcpy() compiles to a leaf function. - * Here leaf function not only means it does not have calls, but also - * requires no stack operations (sp, stack frame pointer) and no - * use of callee-saved registers, else "jrp lr" will be incorrect since - * unwinding stack frame is bypassed. Since memcpy() is not complex so - * these conditions are satisfied here, but we need to be careful when - * modifying this file. This is not a clean solution but is the best - * one so far. - * - * Also note that we are capturing "n" from the containing scope here. - */ - -#define _ST(p, inst, v) \ - ({ \ - asm("1: " #inst " %0, %1;" \ - ".pushsection .coldtext,\"ax\";" \ - "2: { move r0, %2; jrp lr };" \ - ".section __ex_table,\"a\";" \ - ".align 8;" \ - ".quad 1b, 2b;" \ - ".popsection" \ - : "=m" (*(p)) : "r" (v), "r" (n)); \ - }) - -#define _LD(p, inst) \ - ({ \ - unsigned long __v; \ - asm("1: " #inst " %0, %1;" \ - ".pushsection .coldtext,\"ax\";" \ - "2: { move r0, %2; jrp lr };" \ - ".section __ex_table,\"a\";" \ - ".align 8;" \ - ".quad 1b, 2b;" \ - ".popsection" \ - : "=r" (__v) : "m" (*(p)), "r" (n)); \ - __v; \ - }) - -#define USERCOPY_FUNC raw_copy_to_user -#define ST1(p, v) _ST((p), st1, (v)) -#define ST2(p, v) _ST((p), st2, (v)) -#define ST4(p, v) _ST((p), st4, (v)) -#define ST8(p, v) _ST((p), st, (v)) -#define LD1 LD -#define LD2 LD -#define LD4 LD -#define LD8 LD -#include "memcpy_64.c" - -#define USERCOPY_FUNC raw_copy_from_user -#define ST1 ST -#define ST2 ST -#define ST4 ST -#define ST8 ST -#define LD1(p) _LD((p), ld1u) -#define LD2(p) _LD((p), ld2u) -#define LD4(p) _LD((p), ld4u) -#define LD8(p) _LD((p), ld) -#include "memcpy_64.c" - -#define USERCOPY_FUNC raw_copy_in_user -#define ST1(p, v) _ST((p), st1, (v)) -#define ST2(p, v) _ST((p), st2, (v)) -#define ST4(p, v) _ST((p), st4, (v)) -#define ST8(p, v) _ST((p), st, (v)) -#define LD1(p) _LD((p), ld1u) -#define LD2(p) _LD((p), ld2u) -#define LD4(p) _LD((p), ld4u) -#define LD8(p) _LD((p), ld) -#include "memcpy_64.c" |