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add big endian platform support

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This commit is contained in:
kub 2021-02-22 22:25:03 +01:00
parent b053cb2044
commit 57c5a5e505
21 changed files with 224 additions and 178 deletions
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43
pico/pico_port.h
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@ -6,6 +6,7 @@
#if !(defined(_MSC_VER) && _MSC_VER < 1800)
#include <stdint.h>
#endif
#include "pico_types.h"
#if defined(__GNUC__) && defined(__i386__)
#define REGPARM(x) __attribute__((regparm(x)))
@ -32,4 +33,46 @@
#define strdup _strdup
#endif
// There's no standard way to determine endianess at compile time.
// Do not bother with mixed endian platforms, no one will ever compile on that.
#if defined __BYTE_ORDER__
#define CPU_IS_LE __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
#elif defined _BYTE_ORDER
#define CPU_IS_LE __BYTE_ORDER == __LITTLE_ENDIAN
#elif defined __BIG_ENDIAN__ || defined _M_PPC // Windows on PPC was big endian
#define CPU_IS_LE 0
#elif defined __LITTLE_ENDIAN__ || defined _WIN32 // all other Windows is LE
#define CPU_IS_LE 1
#else
#warning "can't detect byte order, assume little endian"
#define CPU_IS_LE 1
#endif
#if CPU_IS_LE
// address/offset operations
#define MEM_BE2(a) ((a)^1) // addr/offs of u8 in u16, or u16 in u32
#define MEM_BE4(a) ((a)^3) // addr/offs of u8 in u32
#define MEM_LE2(a) (a)
#define MEM_LE4(a) (a)
// swapping
#define CPU_BE2(v) (((v)<<16)|((v)>>16))
#define CPU_BE4(v) (((u32)(v)>>24)|(((v)>>8)&0x00ff00)| \
(((v)<<8)&0xff0000)|(u32)((v)<<24))
#define CPU_LE2(v) (v) // swap of 2*u16 in u32
#define CPU_LE4(v) (v) // swap of 4*u8 in u32
#else
// address/offset operations
#define MEM_BE2(a) (a)
#define MEM_BE4(a) (a)
#define MEM_LE2(a) ((a)^1)
#define MEM_LE4(a) ((a)^3)
// swapping
#define CPU_BE2(v) (v)
#define CPU_BE4(v) (v)
#define CPU_LE2(v) (((v)<<16)|((v)>>16))
#define CPU_LE4(v) (((u32)(v)>>24)|(((v)>>8)&0x00ff00)| \
(((v)<<8)&0xff0000)|(u32)((v)<<24))
#endif
#endif // PICO_PORT_INCLUDED