1 2 /*--------------------------------------------------------------------*/ 3 /*--- Asm-only TransTab stuff. pub_core_transtab_asm.h ---*/ 4 /*--------------------------------------------------------------------*/ 5 6 /* 7 This file is part of Valgrind, a dynamic binary instrumentation 8 framework. 9 10 Copyright (C) 2000-2010 Julian Seward 11 jseward (at) acm.org 12 13 This program is free software; you can redistribute it and/or 14 modify it under the terms of the GNU General Public License as 15 published by the Free Software Foundation; either version 2 of the 16 License, or (at your option) any later version. 17 18 This program is distributed in the hope that it will be useful, but 19 WITHOUT ANY WARRANTY; without even the implied warranty of 20 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 21 General Public License for more details. 22 23 You should have received a copy of the GNU General Public License 24 along with this program; if not, write to the Free Software 25 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 26 02111-1307, USA. 27 28 The GNU General Public License is contained in the file COPYING. 29 */ 30 31 #ifndef __PUB_CORE_TRANSTAB_ASM_H 32 #define __PUB_CORE_TRANSTAB_ASM_H 33 34 /* Constants for the fast translation lookup cache. It is a direct 35 mapped cache, with 2^VG_TT_FAST_BITS entries. 36 37 On x86/amd64, the cache index is computed as 38 'address[VG_TT_FAST_BITS-1 : 0]'. 39 40 On ppc32/ppc64, the bottom two bits of instruction addresses are 41 zero, which means that function causes only 1/4 of the entries to 42 ever be used. So instead the function is '(address >>u 43 2)[VG_TT_FAST_BITS-1 : 0]' on those targets. 44 45 On ARM we do like ppc32/ppc64, although that will have to be 46 revisited when we come to implement Thumb. */ 47 48 #define VG_TT_FAST_BITS 15 49 #define VG_TT_FAST_SIZE (1 << VG_TT_FAST_BITS) 50 #define VG_TT_FAST_MASK ((VG_TT_FAST_SIZE) - 1) 51 52 /* This macro isn't usable in asm land; nevertheless this seems 53 like a good place to put it. */ 54 #if defined(VGA_x86) || defined(VGA_amd64) 55 # define VG_TT_FAST_HASH(_addr) ((((UWord)(_addr)) ) & VG_TT_FAST_MASK) 56 #elif defined(VGA_ppc32) || defined(VGA_ppc64) || defined(VGA_arm) 57 # define VG_TT_FAST_HASH(_addr) ((((UWord)(_addr)) >> 2) & VG_TT_FAST_MASK) 58 #else 59 # error "VG_TT_FAST_HASH: unknown platform" 60 #endif 61 62 #endif // __PUB_CORE_TRANSTAB_ASM_H 63 64 /*--------------------------------------------------------------------*/ 65 /*--- end ---*/ 66 /*--------------------------------------------------------------------*/ 67
