minivmac4ios/Mini vMac/mnvm_core/ENDIANAC.h

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2016-05-01 17:05:36 +00:00
/* ENDIANAC.h Copyright (C) 2006 Bernd Schmidt, Paul C. Pratt You can redistribute this file and/or modify it under the terms of version 2 of the GNU General Public License as published by the Free Software Foundation. You should have received a copy of the license along with this file; see the file COPYING. This file 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. See the license for more details. */ /* ENDIAN ACcess Deals with endian issues in memory access. This code is adapted from code in the Un*x Amiga Emulator by Bernd Schmidt, as found in vMac by Philip Cummins. */ #ifdef ENDIANAC_H #ifndef AllFiles #error "header already included" #endif #else #define ENDIANAC_H #endif #if 0 /* works in GCC from Apple. others? */ static inline ui5r MySwapUi5r(ui5r _data) { __asm__ ("bswap %0" : "+r" (_data)); return _data; } #define HaveMySwapUi5r 1 #endif #ifndef HaveMySwapUi5r #define HaveMySwapUi5r 0 #endif #define do_get_mem_byte(a) ((ui3r)*((ui3b *)(a))) #if BigEndianUnaligned #define do_get_mem_word(a) ((ui4r)*((ui4b *)(a))) #else static MayInline ui4r do_get_mem_word(ui3p a) { #if LittleEndianUnaligned ui4b b = (*((ui4b *)(a))); return ((b & 0x00FF) << 8) | ((b >> 8) & 0x00FF); #else return (((ui4r)*a) << 8) | ((ui4r)*(a + 1)); #endif } #endif #if BigEndianUnaligned #define do_get_mem_long(a) ((ui5r)*((ui5b *)(a))) #elif HaveMySwapUi5r && LittleEndianUnaligned #define do_get_mem_long(a) (MySwapUi5r((ui5r)*((ui5b *)(a)))) #else static MayInline ui5r do_get_mem_long(ui3p a) { #if LittleEndianUnaligned #if 0 return ((b << 24) & 0xFF000000) | ((b << 8) & 0x00FF0000) | ((b >> 8) & 0x0000FF00) | ((b >> 24) & 0x000000FF); /* no, this doesn't do well with apple tools, instead try combining two 16 bit swaps. */ #endif ui5b b = (*((ui5b *)(a))); ui4b b1 = b; ui4b b2 = b >> 16; ui4b c1 = ((b1 & 0x00FF) << 8) | ((b1 >> 8) & 0x00FF); ui4b c2 = ((b2 & 0x00FF) << 8) | ((b2 >> 8) & 0x00FF); return (((ui5r)c1) << 16) | ((ui5r)c2); /* better, though still doesn't use BSWAP instruction with apple tools for intel. */ #else return (((ui5r)*a) << 24) | (((ui5r)*(a + 1)) << 16) | (((ui5r)*(a + 2)) << 8) | ((ui5r)*(a + 3)); #endif } #endif #define do_put_mem_byte(a, v) ((*((ui3b *)(a))) = (v)) #if BigEndianUnaligned #define do_put_mem_word(a, v) ((*((ui4b *)(a))) = (v)) #else static MayInline void do_put_mem_word(ui3p a, ui4r v) { #if LittleEndianUnaligned ui4b b = ((v & 0x00FF) << 8) | ((v >> 8) & 0x00FF); *(ui4b *)a = b; #else *a = v >> 8; *(a + 1) = v; #endif } #endif #if BigEndianUnaligned #define do_put_mem_long(a, v) ((*((ui5b *)(a))) = (v)) #elif HaveMySwapUi5r && LittleEndianUnaligned #define do_put_mem_long(a, v) ((*((ui5b *)(a))) = MySwapUi5r(v)) #else static MayInline void do_put_mem_long(ui3p a, ui5r v) { #if LittleEndianUnaligned ui4b b1 = v; ui4b b2 = v >> 16; ui4b c1 = ((b1 & 0x00FF) << 8) | ((b1 >> 8) & 0x00FF); ui4b c2 = ((b2 & 0x00FF) << 8) | ((b2 >> 8) & 0x00FF); *(ui5b *)a = (c1 << 16) | c2; #else *a = v >> 24; *(a + 1) = v >> 16; *(a + 2) = v >> 8; *(a + 3) = v; #endif } #endif