| /** |
| * @file bswap.h |
| * byte swap. |
| */ |
| |
| #ifndef __BSWAP_H__ |
| #define __BSWAP_H__ |
| |
| #include <config.h> |
| |
| #ifdef ARCH_X86 |
| static inline unsigned short ByteSwap16(unsigned short x) |
| { |
| __asm("xchgb %b0,%h0" : |
| "=q" (x) : |
| "0" (x)); |
| return x; |
| } |
| #define bswap_16(x) ByteSwap16(x) |
| |
| static inline unsigned int ByteSwap32(unsigned int x) |
| { |
| #if __CPU__ > 386 |
| __asm("bswap %0": |
| "=r" (x) : |
| #else |
| __asm("xchgb %b0,%h0\n" |
| " rorl $16,%0\n" |
| " xchgb %b0,%h0": |
| "=q" (x) : |
| #endif |
| "0" (x)); |
| return x; |
| } |
| #define bswap_32(x) ByteSwap32(x) |
| |
| static inline unsigned long long int ByteSwap64(unsigned long long int x) |
| { |
| register union { __extension__ uint64_t __ll; |
| uint32_t __l[2]; } __x; |
| asm("xchgl %0,%1": |
| "=r"(__x.__l[0]),"=r"(__x.__l[1]): |
| "0"(bswap_32((unsigned long)x)),"1"(bswap_32((unsigned long)(x>>32)))); |
| return __x.__ll; |
| } |
| #define bswap_64(x) ByteSwap64(x) |
| |
| #elif defined(ARCH_SH4) |
| |
| static inline uint16_t ByteSwap16(uint16_t x) { |
| __asm__("swap.b %0,%0":"=r"(x):"0"(x)); |
| return x; |
| } |
| |
| static inline uint32_t ByteSwap32(uint32_t x) { |
| __asm__( |
| "swap.b %0,%0\n" |
| "swap.w %0,%0\n" |
| "swap.b %0,%0\n" |
| :"=r"(x):"0"(x)); |
| return x; |
| } |
| |
| #define bswap_16(x) ByteSwap16(x) |
| #define bswap_32(x) ByteSwap32(x) |
| |
| static inline uint64_t ByteSwap64(uint64_t x) |
| { |
| union { |
| uint64_t ll; |
| struct { |
| uint32_t l,h; |
| } l; |
| } r; |
| r.l.l = bswap_32 (x); |
| r.l.h = bswap_32 (x>>32); |
| return r.ll; |
| } |
| #define bswap_64(x) ByteSwap64(x) |
| |
| #else |
| |
| #define bswap_16(x) (((x) & 0x00ff) << 8 | ((x) & 0xff00) >> 8) |
| |
| |
| // code from bits/byteswap.h (C) 1997, 1998 Free Software Foundation, Inc. |
| #define bswap_32(x) \ |
| ((((x) & 0xff000000) >> 24) | (((x) & 0x00ff0000) >> 8) | \ |
| (((x) & 0x0000ff00) << 8) | (((x) & 0x000000ff) << 24)) |
| |
| static inline uint64_t ByteSwap64(uint64_t x) |
| { |
| union { |
| uint64_t ll; |
| uint32_t l[2]; |
| } w, r; |
| w.ll = x; |
| r.l[0] = bswap_32 (w.l[1]); |
| r.l[1] = bswap_32 (w.l[0]); |
| return r.ll; |
| } |
| #define bswap_64(x) ByteSwap64(x) |
| |
| #endif /* !ARCH_X86 */ |
| |
| #endif /* !HAVE_BYTESWAP_H */ |
| |
| // be2me ... BigEndian to MachineEndian |
| // le2me ... LittleEndian to MachineEndian |
| |
| #ifdef ROCKBOX_BIG_ENDIAN |
| #define be2me_16(x) (x) |
| #define be2me_32(x) (x) |
| #define be2me_64(x) (x) |
| #define le2me_16(x) bswap_16(x) |
| #define le2me_32(x) bswap_32(x) |
| #define le2me_64(x) bswap_64(x) |
| #else |
| #define be2me_16(x) bswap_16(x) |
| #define be2me_32(x) bswap_32(x) |
| #define be2me_64(x) bswap_64(x) |
| #define le2me_16(x) (x) |
| #define le2me_32(x) (x) |
| #define le2me_64(x) (x) |
| #endif |
| |
| #endif /* __BSWAP_H__ */ |