X-Git-Url: http://git.efficios.com/?a=blobdiff_plain;f=bfd%2Fcpu-i386.c;h=962252d4431fb4ca5c2fc29e5eb92f3cfb29bc09;hb=b300843444cf833f7b3943ebae060c3d88b4ce91;hp=f8991cf1ec438cae87e4fa8bc527b13221e5dee4;hpb=b7761f11062dc4d4fd554342ac2d2fb235b65b7a;p=deliverable%2Fbinutils-gdb.git

diff --git a/bfd/cpu-i386.c b/bfd/cpu-i386.c
index f8991cf1ec..962252d443 100644
--- a/bfd/cpu-i386.c
+++ b/bfd/cpu-i386.c
@@ -1,7 +1,5 @@
 /* BFD support for the Intel 386 architecture.
-   Copyright 1992, 1994, 1995, 1996, 1998, 2000, 2001, 2002, 2004, 2005,
-   2007, 2009, 2010, 2011
-   Free Software Foundation, Inc.
+   Copyright (C) 1992-2020 Free Software Foundation, Inc.
 
    This file is part of BFD, the Binary File Descriptor library.
 
@@ -25,7 +23,8 @@
 #include "libbfd.h"
 #include "libiberty.h"
 
-extern void * bfd_arch_i386_fill (bfd_size_type, bfd_boolean, bfd_boolean);
+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,
@@ -41,16 +40,16 @@ bfd_i386_compatible (const bfd_arch_info_type *a,
   return compat;
 }
 
-/* Fill the buffer with zero or nop instruction if CODE is TRUE.  */
+/* Fill the buffer with zero or nop instruction if CODE is TRUE.  Use
+   multi byte nop instructions if LONG_NOP is TRUE.  */
 
-void *
-bfd_arch_i386_fill (bfd_size_type count,
-		    bfd_boolean is_bigendian ATTRIBUTE_UNUSED,
-		    bfd_boolean code)
+static void *
+bfd_arch_i386_fill (bfd_size_type count, bfd_boolean code,
+		    bfd_boolean long_nop)
 {
   /* nop */
-  static const char nop_1[] = { 0x90 };	
-  /* nopw */
+  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 };
@@ -74,6 +73,7 @@ bfd_arch_i386_fill (bfd_size_type count,
   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)
@@ -82,11 +82,11 @@ bfd_arch_i386_fill (bfd_size_type count,
   if (code)
     {
       bfd_byte *p = fill;
-      while (count >= ARRAY_SIZE (nops))
+      while (count >= nop_size)
 	{
-	  memcpy (p, nops[ARRAY_SIZE (nops) - 1], ARRAY_SIZE (nops));
-	  p += ARRAY_SIZE (nops);
-	  count -= ARRAY_SIZE (nops);
+	  memcpy (p, nops[nop_size - 1], nop_size);
+	  p += nop_size;
+	  count -= nop_size;
 	}
       if (count != 0)
 	memcpy (p, nops[count - 1], count);
@@ -97,121 +97,95 @@ bfd_arch_i386_fill (bfd_size_type count,
   return fill;
 }
 
-static const bfd_arch_info_type bfd_x64_32_arch_intel_syntax =
+/* 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)
 {
-  64, /* 64 bits in a word */
-  64, /* 64 bits in an address */
-  8,  /* 8 bits in a byte */
-  bfd_arch_i386,
-  bfd_mach_x64_32_intel_syntax,
-  "i386:intel",
-  "i386:x64-32:intel",
-  3,
-  FALSE,
-  bfd_i386_compatible,
-  bfd_default_scan,
-  bfd_arch_i386_fill,
-  0
-};
+  return bfd_arch_i386_fill (count, code, FALSE);
+}
 
-static const bfd_arch_info_type bfd_x86_64_arch_intel_syntax =
+/* 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)
 {
-  64, /* 64 bits in a word */
-  64, /* 64 bits in an address */
-  8,  /* 8 bits in a byte */
-  bfd_arch_i386,
-  bfd_mach_x86_64_intel_syntax,
-  "i386:intel",
-  "i386:x86-64:intel",
-  3,
-  FALSE,
-  bfd_i386_compatible,
-  bfd_default_scan,
-  bfd_arch_i386_fill,
-  &bfd_x64_32_arch_intel_syntax,
-};
+  return bfd_arch_i386_fill (count, code, TRUE);
+}
 
-static const bfd_arch_info_type bfd_i386_arch_intel_syntax =
+/* Fill the buffer with zero, or one-byte nop instructions if CODE is TRUE.  */
+
+static void *
+bfd_arch_i386_onebyte_nop_fill (bfd_size_type count,
+				bfd_boolean is_bigendian ATTRIBUTE_UNUSED,
+				bfd_boolean code)
 {
-  32,	/* 32 bits in a word */
-  32,	/* 32 bits in an address */
-  8,	/* 8 bits in a byte */
-  bfd_arch_i386,
-  bfd_mach_i386_i386_intel_syntax,
-  "i386:intel",
-  "i386:intel",
-  3,
-  TRUE,
-  bfd_i386_compatible,
-  bfd_default_scan,
-  bfd_arch_i386_fill,
-  &bfd_x86_64_arch_intel_syntax
-};
+  void *fill = bfd_malloc (count);
+  if (fill != NULL)
+    memset (fill, code ? 0x90 : 0, count);
+  return fill;
+}
+
+#define N(BITS, MACH, NAME, PRINT, DEF, FILL, NEXT)	\
+  { BITS, /* Bits in a word.  */		\
+    BITS, /* Bits in an address.  */		\
+    8,    /* Bits in a byte. */			\
+    bfd_arch_i386,				\
+    MACH, /* Machine number.  */		\
+    NAME,					\
+    PRINT,					\
+    3,   /* Section alignment power.  */	\
+    DEF, /* Default architecture version ?  */	\
+    bfd_i386_compatible,			\
+    bfd_default_scan,				\
+    FILL,					\
+    NEXT,					\
+    0 /* Maximum instruction length.  */	\
+  }
+
+
+static const bfd_arch_info_type bfd_x64_32_nacl_arch =
+  N (64, bfd_mach_x64_32_nacl, "i386", "i386:x64-32:nacl",
+     FALSE, bfd_arch_i386_onebyte_nop_fill, NULL);
+
+static const bfd_arch_info_type bfd_x86_64_nacl_arch =
+  N (64, bfd_mach_x86_64_nacl, "i386", "i386:x86-64:nacl",
+     FALSE, bfd_arch_i386_onebyte_nop_fill, &bfd_x64_32_nacl_arch);
+
+const bfd_arch_info_type bfd_i386_nacl_arch =
+  N (32, bfd_mach_i386_i386_nacl, "i386", "i386:nacl",
+     TRUE, bfd_arch_i386_onebyte_nop_fill, &bfd_x86_64_nacl_arch);
+
+
+static const bfd_arch_info_type bfd_x64_32_arch_intel_syntax =
+  N (64, bfd_mach_x64_32_intel_syntax, "i386:intel", "i386:x64-32:intel",
+     FALSE, bfd_arch_i386_long_nop_fill, &bfd_i386_nacl_arch);
+
+static const bfd_arch_info_type bfd_x86_64_arch_intel_syntax =
+  N (64, bfd_mach_x86_64_intel_syntax, "i386:intel", "i386:x86-64:intel",
+     FALSE, bfd_arch_i386_long_nop_fill, &bfd_x64_32_arch_intel_syntax);
+
+static const bfd_arch_info_type bfd_i386_arch_intel_syntax =
+  N (32, bfd_mach_i386_i386_intel_syntax, "i386:intel", "i386:intel",
+     TRUE, bfd_arch_i386_short_nop_fill, &bfd_x86_64_arch_intel_syntax);
+
 
 static const bfd_arch_info_type i8086_arch =
-{
-  32,	/* 32 bits in a word */
-  32,	/* 32 bits in an address (well, not really) */
-  8,	/* 8 bits in a byte */
-  bfd_arch_i386,
-  bfd_mach_i386_i8086,
-  "i8086",
-  "i8086",
-  3,
-  FALSE,
-  bfd_i386_compatible,
-  bfd_default_scan,
-  bfd_arch_i386_fill,
-  &bfd_i386_arch_intel_syntax
-};
+  N (32, bfd_mach_i386_i8086, "i8086", "i8086",
+     FALSE, bfd_arch_i386_short_nop_fill, &bfd_i386_arch_intel_syntax);
 
 static const bfd_arch_info_type bfd_x64_32_arch =
-{
-  64, /* 64 bits in a word */
-  64, /* 64 bits in an address */
-  8,  /* 8 bits in a byte */
-  bfd_arch_i386,
-  bfd_mach_x64_32,
-  "i386",
-  "i386:x64-32",
-  3,
-  FALSE,
-  bfd_i386_compatible,
-  bfd_default_scan,
-  bfd_arch_i386_fill,
-  &i8086_arch
-};
+  N (64, bfd_mach_x64_32, "i386", "i386:x64-32",
+     FALSE, bfd_arch_i386_long_nop_fill, &i8086_arch);
 
 static const bfd_arch_info_type bfd_x86_64_arch =
-{
-  64, /* 64 bits in a word */
-  64, /* 64 bits in an address */
-  8,  /* 8 bits in a byte */
-  bfd_arch_i386,
-  bfd_mach_x86_64,
-  "i386",
-  "i386:x86-64",
-  3,
-  FALSE,
-  bfd_i386_compatible,
-  bfd_default_scan,
-  bfd_arch_i386_fill,
-  &bfd_x64_32_arch
-};
+  N (64, bfd_mach_x86_64, "i386", "i386:x86-64",
+     FALSE, bfd_arch_i386_long_nop_fill, &bfd_x64_32_arch);
 
 const bfd_arch_info_type bfd_i386_arch =
-{
-  32,	/* 32 bits in a word */
-  32,	/* 32 bits in an address */
-  8,	/* 8 bits in a byte */
-  bfd_arch_i386,
-  bfd_mach_i386_i386,
-  "i386",
-  "i386",
-  3,
-  TRUE,
-  bfd_i386_compatible,
-  bfd_default_scan,
-  bfd_arch_i386_fill,
-  &bfd_x86_64_arch
-};
+  N (32, bfd_mach_i386_i386, "i386", "i386",
+     TRUE, bfd_arch_i386_short_nop_fill, &bfd_x86_64_arch);