Merge GDB 7.5.1

bfd/cpu-i386.c

Index: bfd/cpu-i386.c
diff --git a/bfd/cpu-i386.c b/bfd/cpu-i386.c
index f98c0e50529a74432ee797db0e9c4e11939310b3..4cb59ed8981527ac94896d8054184c97bf96f9ad 100644
--- a/bfd/cpu-i386.c
+++ b/bfd/cpu-i386.c
@@ -23,6 +23,10 @@
 #include "sysdep.h"
 #include "bfd.h"
 #include "libbfd.h"
+#include "libiberty.h"
+
+extern void * bfd_arch_i386_short_nop_fill (bfd_size_type, bfd_boolean,
+					    bfd_boolean);
 
 static const bfd_arch_info_type *
 bfd_i386_compatible (const bfd_arch_info_type *a,
@@ -38,6 +42,83 @@ bfd_i386_compatible (const bfd_arch_info_type *a,
   return compat;
 }
 
+/* Fill the buffer with zero or nop instruction if CODE is TRUE.  Use
+   multi byte nop instructions if LONG_NOP is TRUE.  */
+
+static void *
+bfd_arch_i386_fill (bfd_size_type count, bfd_boolean code,
+		    bfd_boolean long_nop)
+{
+  /* nop */
+  static const char nop_1[] = { 0x90 };	
+  /* xchg %ax,%ax */
+  static const char nop_2[] = { 0x66, 0x90 };
+  /* nopl (%[re]ax) */
+  static const char nop_3[] = { 0x0f, 0x1f, 0x00 };
+  /* nopl 0(%[re]ax) */
+  static const char nop_4[] = { 0x0f, 0x1f, 0x40, 0x00 };
+  /* nopl 0(%[re]ax,%[re]ax,1) */
+  static const char nop_5[] = { 0x0f, 0x1f, 0x44, 0x00, 0x00 };
+  /* nopw 0(%[re]ax,%[re]ax,1) */
+  static const char nop_6[] = { 0x66, 0x0f, 0x1f, 0x44, 0x00, 0x00 };
+  /* nopl 0L(%[re]ax) */
+  static const char nop_7[] = { 0x0f, 0x1f, 0x80, 0x00, 0x00, 0x00, 0x00 };
+  /* nopl 0L(%[re]ax,%[re]ax,1) */
+  static const char nop_8[] =
+    { 0x0f, 0x1f, 0x84, 0x00, 0x00, 0x00, 0x00, 0x00};
+  /* nopw 0L(%[re]ax,%[re]ax,1) */
+  static const char nop_9[] =
+    { 0x66, 0x0f, 0x1f, 0x84, 0x00, 0x00, 0x00, 0x00, 0x00 };
+  /* nopw %cs:0L(%[re]ax,%[re]ax,1) */
+  static const char nop_10[] =
+    { 0x66, 0x2e, 0x0f, 0x1f, 0x84, 0x00, 0x00, 0x00, 0x00, 0x00 };
+  static const char *const nops[] =
+    { nop_1, nop_2, nop_3, nop_4, nop_5,
+      nop_6, nop_7, nop_8, nop_9, nop_10 };
+  bfd_size_type nop_size = long_nop ? ARRAY_SIZE (nops) : 2;
+
+  void *fill = bfd_malloc (count);
+  if (fill == NULL)
+    return fill;
+
+  if (code)
+    {
+      bfd_byte *p = fill;
+      while (count >= nop_size)
+	{
+	  memcpy (p, nops[nop_size - 1], nop_size);
+	  p += nop_size;
+	  count -= nop_size;
+	}
+      if (count != 0)
+	memcpy (p, nops[count - 1], count);
+    }
+  else
+    memset (fill, 0, count);
+
+  return fill;
+}
+
+/* Fill the buffer with zero or short nop instruction if CODE is TRUE.  */
+
+void *
+bfd_arch_i386_short_nop_fill (bfd_size_type count,
+			      bfd_boolean is_bigendian ATTRIBUTE_UNUSED,
+			      bfd_boolean code)
+{
+  return bfd_arch_i386_fill (count, code, FALSE);
+}
+
+/* Fill the buffer with zero or long nop instruction if CODE is TRUE.  */
+
+static void *
+bfd_arch_i386_long_nop_fill (bfd_size_type count,
+			     bfd_boolean is_bigendian ATTRIBUTE_UNUSED,
+			     bfd_boolean code)
+{
+  return bfd_arch_i386_fill (count, code, TRUE);
+}
+
 static const bfd_arch_info_type bfd_x64_32_arch_intel_syntax =
 {
   64, /* 64 bits in a word */
@@ -51,6 +132,7 @@ static const bfd_arch_info_type bfd_x64_32_arch_intel_syntax =
   FALSE,
   bfd_i386_compatible,
   bfd_default_scan,
+  bfd_arch_i386_long_nop_fill,
   0
 };
 
@@ -67,6 +149,7 @@ static const bfd_arch_info_type bfd_x86_64_arch_intel_syntax =
   FALSE,
   bfd_i386_compatible,
   bfd_default_scan,
+  bfd_arch_i386_long_nop_fill,
   &bfd_x64_32_arch_intel_syntax,
 };
 
@@ -83,6 +166,7 @@ static const bfd_arch_info_type bfd_i386_arch_intel_syntax =
   TRUE,
   bfd_i386_compatible,
   bfd_default_scan,
+  bfd_arch_i386_short_nop_fill,
   &bfd_x86_64_arch_intel_syntax
 };
 
@@ -99,6 +183,7 @@ static const bfd_arch_info_type i8086_arch =
   FALSE,
   bfd_i386_compatible,
   bfd_default_scan,
+  bfd_arch_i386_short_nop_fill,
   &bfd_i386_arch_intel_syntax
 };
 
@@ -115,6 +200,7 @@ static const bfd_arch_info_type bfd_x64_32_arch =
   FALSE,
   bfd_i386_compatible,
   bfd_default_scan,
+  bfd_arch_i386_long_nop_fill,
   &i8086_arch
 };
 
@@ -131,6 +217,7 @@ static const bfd_arch_info_type bfd_x86_64_arch =
   FALSE,
   bfd_i386_compatible,
   bfd_default_scan,
+  bfd_arch_i386_long_nop_fill,
   &bfd_x64_32_arch
 };
 
@@ -147,5 +234,6 @@ const bfd_arch_info_type bfd_i386_arch =
   TRUE,
   bfd_i386_compatible,
   bfd_default_scan,
+  bfd_arch_i386_short_nop_fill,
   &bfd_x86_64_arch
 };