From c906108c21474dfb4ed285bcc0ac6fe02cd400cc Mon Sep 17 00:00:00 2001
From: Stan Shebs <shebs@codesourcery.com>
Date: Fri, 16 Apr 1999 01:35:26 +0000
Subject: Initial creation of sourceware repository

---
 sim/d10v/endian.c | 137 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 137 insertions(+)
 create mode 100644 sim/d10v/endian.c

(limited to 'sim/d10v/endian.c')

diff --git a/sim/d10v/endian.c b/sim/d10v/endian.c
new file mode 100644
index 0000000..9ef503e
--- /dev/null
+++ b/sim/d10v/endian.c
@@ -0,0 +1,137 @@
+/* If we're being compiled as a .c file, rather than being included in
+   d10v_sim.h, then ENDIAN_INLINE won't be defined yet.  */
+
+#ifndef ENDIAN_INLINE
+#define NO_ENDIAN_INLINE
+#include "d10v_sim.h"
+#define ENDIAN_INLINE
+#endif
+
+ENDIAN_INLINE uint16
+get_word (x)
+      uint8 *x;
+{
+#if (defined(__i386__) || defined(__i486__) || defined(__i586__) || defined(__i686__)) && defined(__GNUC__)
+
+  unsigned short word = *(unsigned short *)x;
+  __asm__ ("xchgb %b0,%h0" : "=q" (word) : "0" (word));
+  return word;
+
+#elif defined(WORDS_BIGENDIAN)
+  /* It is safe to do this on big endian hosts, since the d10v requires that words be
+     aligned on 16-bit boundaries.  */
+  return *(uint16 *)x;
+
+#else
+  return ((uint16)x[0]<<8) + x[1];
+#endif
+}
+
+ENDIAN_INLINE uint32
+get_longword (x)
+      uint8 *x;
+{
+#if (defined(__i486__) || defined(__i586__) || defined(__i686__)) && defined(__GNUC__) && defined(USE_BSWAP)
+
+  unsigned int long_word = *(unsigned *)x;
+  __asm__ ("bswap %0" : "=r" (long_word) : "0" (long_word));
+  return long_word;
+
+#elif (defined(__i386__) || defined(__i486__) || defined(__i586__) || defined(__i686__)) && defined(__GNUC__)
+
+  unsigned int long_word = *(unsigned *)x;
+  __asm__("xchgb %b0,%h0\n\t"		/* swap lower bytes	*/
+	  "rorl $16,%0\n\t"		/* swap words		*/
+	  "xchgb %b0,%h0"		/* swap higher bytes	*/
+	  :"=q" (long_word)
+	  : "0" (long_word));
+
+  return long_word;
+
+#elif (defined(_POWER) && defined(_AIX)) || (defined(__PPC__) && defined(__BIG_ENDIAN__))
+  /* Power & PowerPC computers in big endian mode can handle unaligned loads&stores */
+  return *(uint32 *)x;
+
+#elif defined(WORDS_BIGENDIAN)
+  /* long words must be aligned on at least 16-bit boundaries, so this should be safe.  */
+  return (((uint32) *(uint16 *)x)<<16) | ((uint32) *(uint16 *)(x+2));
+
+#else
+  return ((uint32)x[0]<<24) + ((uint32)x[1]<<16) + ((uint32)x[2]<<8) + ((uint32)x[3]);
+#endif
+}
+
+ENDIAN_INLINE int64
+get_longlong (x)
+      uint8 *x;
+{
+  uint32 top = get_longword (x);
+  uint32 bottom = get_longword (x+4);
+  return (((int64)top)<<32) | (int64)bottom;
+}
+
+ENDIAN_INLINE void
+write_word (addr, data)
+     uint8 *addr;
+     uint16 data;
+{
+#if (defined(__i386__) || defined(__i486__) || defined(__i586__) || defined(__i686__)) && defined(__GNUC__)
+
+  __asm__ ("xchgb %b0,%h0" : "=q" (data) : "0" (data));
+  *(uint16 *)addr = data;
+
+#elif defined(WORDS_BIGENDIAN)
+  /* It is safe to do this on big endian hosts, since the d10v requires that words be
+     aligned on 16-bit boundaries.  */
+  *(uint16 *)addr = data;
+
+#else
+  addr[0] = (data >> 8) & 0xff;
+  addr[1] = data & 0xff;
+#endif
+}
+
+ENDIAN_INLINE void
+write_longword (addr, data)
+     uint8 *addr;
+     uint32 data;
+{
+#if (defined(__i486__) || defined(__i586__) || defined(__i686__)) && defined(__GNUC__) && defined(USE_BSWAP)
+
+  __asm__ ("bswap %0" : "=r" (data) : "0" (data));
+  *(uint32 *)addr = data;
+
+#elif (defined(__i386__) || defined(__i486__) || defined(__i586__) || defined(__i686__)) && defined(__GNUC__)
+
+  __asm__("xchgb %b0,%h0\n\t"		/* swap lower bytes	*/
+	  "rorl $16,%0\n\t"		/* swap words		*/
+	  "xchgb %b0,%h0"		/* swap higher bytes	*/
+	  :"=q" (data)
+	  : "0" (data));
+
+  *(uint32 *)addr = data;
+
+#elif (defined(_POWER) && defined(_AIX)) || (defined(__PPC__) && defined(__BIG_ENDIAN__))
+  /* Power & PowerPC computers in big endian mode can handle unaligned loads&stores */
+  *(uint32 *)addr = data;
+
+#elif defined(WORDS_BIGENDIAN)
+  *(uint16 *)addr = (uint16)(data >> 16);
+  *(uint16 *)(addr + 2) = (uint16)data;
+
+#else
+  addr[0] = (data >> 24) & 0xff;
+  addr[1] = (data >> 16) & 0xff;
+  addr[2] = (data >> 8) & 0xff;
+  addr[3] = data & 0xff;
+#endif
+}
+
+ENDIAN_INLINE void
+write_longlong (addr, data)
+     uint8 *addr;
+     int64 data;
+{
+  write_longword (addr, (uint32)(data >> 32));
+  write_longword (addr+4, (uint32)data);
+}
-- 
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