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155 lines
2.9 KiB
155 lines
2.9 KiB
/** |
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* @file bswap.h |
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* byte swap. |
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*/ |
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#ifndef __BSWAP_H__ |
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#define __BSWAP_H__ |
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#ifdef HAVE_BYTESWAP_H |
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#include <byteswap.h> |
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#else |
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#ifdef ARCH_X86_64 |
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# define LEGACY_REGS "=Q" |
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#else |
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# define LEGACY_REGS "=q" |
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#endif |
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#if defined(ARCH_X86) || defined(ARCH_X86_64) |
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static always_inline uint16_t bswap_16(uint16_t x) |
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{ |
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__asm("rorw $8, %0" : |
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LEGACY_REGS (x) : |
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"0" (x)); |
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return x; |
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} |
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static always_inline uint32_t bswap_32(uint32_t x) |
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{ |
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#if __CPU__ > 386 |
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__asm("bswap %0": |
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"=r" (x) : |
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#else |
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__asm("xchgb %b0,%h0\n" |
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" rorl $16,%0\n" |
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" xchgb %b0,%h0": |
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LEGACY_REGS (x) : |
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#endif |
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"0" (x)); |
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return x; |
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} |
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static inline uint64_t bswap_64(uint64_t x) |
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{ |
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#ifdef ARCH_X86_64 |
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__asm("bswap %0": |
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"=r" (x) : |
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"0" (x)); |
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return x; |
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#else |
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union { |
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uint64_t ll; |
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struct { |
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uint32_t l,h; |
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} l; |
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} r; |
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r.l.l = bswap_32 (x); |
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r.l.h = bswap_32 (x>>32); |
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return r.ll; |
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#endif |
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} |
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#elif defined(ARCH_SH4) |
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static always_inline uint16_t bswap_16(uint16_t x) { |
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__asm__("swap.b %0,%0":"=r"(x):"0"(x)); |
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return x; |
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} |
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static always_inline uint32_t bswap_32(uint32_t x) { |
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__asm__( |
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"swap.b %0,%0\n" |
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"swap.w %0,%0\n" |
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"swap.b %0,%0\n" |
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:"=r"(x):"0"(x)); |
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return x; |
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} |
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static inline uint64_t bswap_64(uint64_t x) |
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{ |
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union { |
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uint64_t ll; |
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struct { |
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uint32_t l,h; |
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} l; |
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} r; |
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r.l.l = bswap_32 (x); |
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r.l.h = bswap_32 (x>>32); |
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return r.ll; |
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} |
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#else |
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static always_inline uint16_t bswap_16(uint16_t x){ |
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return (x>>8) | (x<<8); |
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} |
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#ifdef ARCH_ARM |
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static always_inline uint32_t bswap_32(uint32_t x){ |
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uint32_t t; |
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__asm__ ( |
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"eor %1, %0, %0, ror #16 \n\t" |
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"bic %1, %1, #0xFF0000 \n\t" |
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"mov %0, %0, ror #8 \n\t" |
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"eor %0, %0, %1, lsr #8 \n\t" |
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: "+r"(x), "+r"(t)); |
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return x; |
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} |
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#else |
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static always_inline uint32_t bswap_32(uint32_t x){ |
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x= ((x<<8)&0xFF00FF00) | ((x>>8)&0x00FF00FF); |
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return (x>>16) | (x<<16); |
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} |
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#endif |
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static inline uint64_t bswap_64(uint64_t x) |
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{ |
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#if 0 |
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x= ((x<< 8)&0xFF00FF00FF00FF00ULL) | ((x>> 8)&0x00FF00FF00FF00FFULL); |
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x= ((x<<16)&0xFFFF0000FFFF0000ULL) | ((x>>16)&0x0000FFFF0000FFFFULL); |
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return (x>>32) | (x<<32); |
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#else |
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union { |
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uint64_t ll; |
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uint32_t l[2]; |
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} w, r; |
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w.ll = x; |
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r.l[0] = bswap_32 (w.l[1]); |
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r.l[1] = bswap_32 (w.l[0]); |
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return r.ll; |
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#endif |
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} |
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#endif /* !ARCH_X86 */ |
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#endif /* !HAVE_BYTESWAP_H */ |
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// be2me ... BigEndian to MachineEndian |
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// le2me ... LittleEndian to MachineEndian |
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#ifdef WORDS_BIGENDIAN |
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#define be2me_16(x) (x) |
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#define be2me_32(x) (x) |
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#define be2me_64(x) (x) |
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#define le2me_16(x) bswap_16(x) |
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#define le2me_32(x) bswap_32(x) |
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#define le2me_64(x) bswap_64(x) |
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#else |
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#define be2me_16(x) bswap_16(x) |
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#define be2me_32(x) bswap_32(x) |
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#define be2me_64(x) bswap_64(x) |
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#define le2me_16(x) (x) |
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#define le2me_32(x) (x) |
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#define le2me_64(x) (x) |
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#endif |
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#endif /* __BSWAP_H__ */
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