[Mach-O, committed]: Dump compact unwind entries for arm64

[Tristan Gingold]

With this patch, unwind entries for arm64/aarch64 are now displayed
by objdump -P compact_unwind.

Pushed on master.

Tristan.

mach-o: decode and display arm64 compact unwind entries.


diff --git a/binutils/ChangeLog b/binutils/ChangeLog
index 1443468..b9a42d2 100644
--- a/binutils/ChangeLog
+++ b/binutils/ChangeLog
@@ -1,3 +1,10 @@
+2015-11-18  Tristan Gingold  <gingold@adacore.com>
+
+	* od-macho.c (bfd_mach_o_load_command_name): Add new
+	entries.
+	(dump_unwind_encoding_arm64): New function.
+	(dump_unwind_encoding): Handle arm64.
+
 2015-11-13  Tristan Gingold  <gingold@adacore.com>
 
 	* configure: Regenerate.
diff --git a/binutils/od-macho.c b/binutils/od-macho.c
index 0bb627d..cb04409 100644
--- a/binutils/od-macho.c
+++ b/binutils/od-macho.c
@@ -203,6 +203,9 @@ static const bfd_mach_o_xlat_name bfd_mach_o_load_command_name[] =
   { "data_in_code", BFD_MACH_O_LC_DATA_IN_CODE},
   { "source_version", BFD_MACH_O_LC_SOURCE_VERSION},
   { "dylib_code_sign_drs", BFD_MACH_O_LC_DYLIB_CODE_SIGN_DRS},
+  { "encryption_info_64", BFD_MACH_O_LC_ENCRYPTION_INFO_64},
+  { "linker_options", BFD_MACH_O_LC_LINKER_OPTIONS},
+  { "linker_optimization_hint", BFD_MACH_O_LC_LINKER_OPTIMIZATION_HINT},
   { NULL, 0}
 };
 
@@ -1788,6 +1791,62 @@ dump_unwind_encoding_x86 (unsigned int encoding, unsigned int sz,
     }
 }
 
+/* Dump arm64 compact unwind entries.  */
+
+static void
+dump_unwind_encoding_arm64 (unsigned int encoding)
+{
+  switch (encoding & MACH_O_UNWIND_ARM64_MODE_MASK)
+    {
+    case MACH_O_UNWIND_ARM64_MODE_FRAMELESS:
+      printf (" frameless");
+      break;
+    case MACH_O_UNWIND_ARM64_MODE_DWARF:
+      printf (" Dwarf offset: 0x%06x",
+	      encoding & MACH_O_UNWIND_ARM64_DWARF_SECTION_OFFSET);
+      return;
+    case MACH_O_UNWIND_ARM64_MODE_FRAME:
+      printf (" frame");
+      break;
+    default:
+      printf (" [unhandled mode]");
+      return;
+    }
+  switch (encoding & MACH_O_UNWIND_ARM64_MODE_MASK)
+    {
+    case MACH_O_UNWIND_ARM64_MODE_FRAMELESS:
+    case MACH_O_UNWIND_ARM64_MODE_FRAME:
+      if (encoding & MACH_O_UNWIND_ARM64_FRAME_X19_X20_PAIR)
+	printf (" x19-x20");
+      if (encoding & MACH_O_UNWIND_ARM64_FRAME_X21_X22_PAIR)
+	printf (" x21-x22");
+      if (encoding & MACH_O_UNWIND_ARM64_FRAME_X23_X24_PAIR)
+	printf (" x23-x24");
+      if (encoding & MACH_O_UNWIND_ARM64_FRAME_X25_X26_PAIR)
+	printf (" x25-x26");
+      if (encoding & MACH_O_UNWIND_ARM64_FRAME_X27_X28_PAIR)
+	printf (" x27-x28");
+      break;
+    }
+  switch (encoding & MACH_O_UNWIND_ARM64_MODE_MASK)
+    {
+    case MACH_O_UNWIND_ARM64_MODE_FRAME:
+      if (encoding & MACH_O_UNWIND_ARM64_FRAME_D8_D9_PAIR)
+	printf (" d8-d9");
+      if (encoding & MACH_O_UNWIND_ARM64_FRAME_D10_D11_PAIR)
+	printf (" d10-d11");
+      if (encoding & MACH_O_UNWIND_ARM64_FRAME_D12_D13_PAIR)
+	printf (" d12-d13");
+      if (encoding & MACH_O_UNWIND_ARM64_FRAME_D14_D15_PAIR)
+	printf (" d14-d15");
+      break;
+    case MACH_O_UNWIND_ARM64_MODE_FRAMELESS:
+      printf (" size: %u",
+	      (encoding & MACH_O_UNWIND_ARM64_FRAMELESS_STACK_SIZE_MASK) >> 8);
+      break;
+    }
+}
+
 static void
 dump_unwind_encoding (bfd_mach_o_data_struct *mdata, unsigned int encoding)
 {
@@ -1803,6 +1862,9 @@ dump_unwind_encoding (bfd_mach_o_data_struct *mdata, unsigned int encoding)
     case BFD_MACH_O_CPU_TYPE_I386:
       dump_unwind_encoding_x86 (encoding, 4, unwind_x86_regs);
       break;
+    case BFD_MACH_O_CPU_TYPE_ARM64:
+      dump_unwind_encoding_arm64 (encoding);
+      break;
     default:
       printf (" [unhandled cpu]");
       break;