[binutils, ARM, 1/16] Add support for Armv8.1-M Mainline CLI

The patch is straightforward, it does the following:

- support the new Tag_CPU_arch build attribute value, ie.:
   + declare the new value
   + update all the asserts forcing logic to be reviewed for new
     architectures
   + create a corresponding bfd_mach_arm_8_1M_MAIN enumerator in bfd and
     add mapping from Tag_CPU_arch to it
   + teach readelf about new Tag_CPU_arch value
- declare armv8.1-m.main as a supported architecture value
- define Armv8.1-M Mainline in terms of feature bits available
- tell objdump mapping from bfd_mach_arm_8_1M_MAIN enumerator to feature
   bits available
- update architecture-specific logic in gas and bfd guarded by the
   asserts mentioned above.
- tests for all the above

ChangeLog entries are as follows:

*** bfd/ChangeLog ***

2019-04-15  Thomas Preud'homme  <thomas.preudhomme@arm.com>

	* archures.c (bfd_mach_arm_8_1M_MAIN): Define.
	* bfd-in2.h: Regenerate.
	* cpu-arm.c (arch_info_struct): Add entry for Armv8.1-M Mainline.
	* elf32-arm.c (using_thumb_only): Return true for Armv8.1-M Mainline
	and update assert.
	(using_thumb2): Likewise.
	(using_thumb2_bl): Update assert.
	(arch_has_arm_nop): Likewise.
	(bfd_arm_get_mach_from_attributes): Add case for Armv8.1-M Mainline.
	(tag_cpu_arch_combine): Add logic for Armv8.1-M Mainline merging.

*** binutils/ChangeLog ***

2019-04-15  Thomas Preud'homme  <thomas.preudhomme@arm.com>

	* readelf.c (arm_attr_tag_CPU_arch): Add entry for Armv8.1-M Mainline.

*** gas/ChangeLog ***

2019-04-15  Thomas Preud'homme  <thomas.preudhomme@arm.com>

	* config/tc-arm.c (cpu_arch_ver): Add entry for Armv8.1-M Mainline
	Tag_CPU_arch build attribute value.  Reindent.
	(get_aeabi_cpu_arch_from_fset): Update assert.
	(aeabi_set_public_attributes): Update assert for Tag_DIV_use logic.
	* testsuite/gas/arm/attr-march-armv8_1-m.main.d: New test.

*** include/ChangeLog ***

2019-04-15  Thomas Preud'homme  <thomas.preudhomme@arm.com>

	* elf/arm.h (TAG_CPU_ARCH_V8_1M_MAIN): new macro.
	(MAX_TAG_CPU_ARCH): Set value to above macro.
	* opcode/arm.h (ARM_EXT2_V8_1M_MAIN): New macro.
	(ARM_AEXT_V8_1M_MAIN): Likewise.
	(ARM_AEXT2_V8_1M_MAIN): Likewise.
	(ARM_ARCH_V8_1M_MAIN): Likewise.

*** ld/ChangeLog ***

2019-04-15  Thomas Preud'homme  <thomas.preudhomme@arm.com>

	* testsuite/ld-arm/attr-merge-13.attr: New test.
	* testsuite/ld-arm/attr-merge-13a.s: New test.
	* testsuite/ld-arm/attr-merge-13b.s: New test.

*** opcodes/ChangeLog ***

2019-04-15  Thomas Preud'homme  <thomas.preudhomme@arm.com>

	* arm-dis.c (select_arm_features): Add logic for Armv8.1-M Mainline.

1 files changed, 47 insertions, 45 deletions

diff --git a/gas/config/tc-arm.c b/gas/config/tc-arm.c
index 4218d05..4f96066 100644
--- a/gas/config/tc-arm.c
+++ b/gas/config/tc-arm.c
@@ -26570,6 +26570,7 @@ static const struct arm_arch_option_table arm_archs[] =
   ARM_ARCH_OPT ("armv8-m.base",	  ARM_ARCH_V8M_BASE,	FPU_ARCH_VFP),
   ARM_ARCH_OPT2 ("armv8-m.main",  ARM_ARCH_V8M_MAIN,	FPU_ARCH_VFP,
 		 armv8m_main),
+  ARM_ARCH_OPT ("armv8.1-m.main", ARM_ARCH_V8_1M_MAIN,	FPU_ARCH_VFP),
   ARM_ARCH_OPT2 ("armv8-a",	  ARM_ARCH_V8A,		FPU_ARCH_VFP, armv8a),
   ARM_ARCH_OPT2 ("armv8.1-a",	  ARM_ARCH_V8_1A,	FPU_ARCH_VFP, armv81a),
   ARM_ARCH_OPT2 ("armv8.2-a",	  ARM_ARCH_V8_2A,	FPU_ARCH_VFP, armv82a),
@@ -27284,30 +27285,30 @@ typedef struct
    stable when new architectures are added.  */
 static const cpu_arch_ver_table cpu_arch_ver[] =
 {
-    {TAG_CPU_ARCH_PRE_V4,   ARM_ARCH_V1},
-    {TAG_CPU_ARCH_PRE_V4,   ARM_ARCH_V2},
-    {TAG_CPU_ARCH_PRE_V4,   ARM_ARCH_V2S},
-    {TAG_CPU_ARCH_PRE_V4,   ARM_ARCH_V3},
-    {TAG_CPU_ARCH_PRE_V4,   ARM_ARCH_V3M},
-    {TAG_CPU_ARCH_V4,	    ARM_ARCH_V4xM},
-    {TAG_CPU_ARCH_V4,	    ARM_ARCH_V4},
-    {TAG_CPU_ARCH_V4T,	    ARM_ARCH_V4TxM},
-    {TAG_CPU_ARCH_V4T,	    ARM_ARCH_V4T},
-    {TAG_CPU_ARCH_V5T,	    ARM_ARCH_V5xM},
-    {TAG_CPU_ARCH_V5T,	    ARM_ARCH_V5},
-    {TAG_CPU_ARCH_V5T,	    ARM_ARCH_V5TxM},
-    {TAG_CPU_ARCH_V5T,	    ARM_ARCH_V5T},
-    {TAG_CPU_ARCH_V5TE,	    ARM_ARCH_V5TExP},
-    {TAG_CPU_ARCH_V5TE,	    ARM_ARCH_V5TE},
-    {TAG_CPU_ARCH_V5TEJ,    ARM_ARCH_V5TEJ},
-    {TAG_CPU_ARCH_V6,	    ARM_ARCH_V6},
-    {TAG_CPU_ARCH_V6KZ,	    ARM_ARCH_V6Z},
-    {TAG_CPU_ARCH_V6KZ,	    ARM_ARCH_V6KZ},
-    {TAG_CPU_ARCH_V6K,	    ARM_ARCH_V6K},
-    {TAG_CPU_ARCH_V6T2,	    ARM_ARCH_V6T2},
-    {TAG_CPU_ARCH_V6T2,	    ARM_ARCH_V6KT2},
-    {TAG_CPU_ARCH_V6T2,	    ARM_ARCH_V6ZT2},
-    {TAG_CPU_ARCH_V6T2,	    ARM_ARCH_V6KZT2},
+    {TAG_CPU_ARCH_PRE_V4,     ARM_ARCH_V1},
+    {TAG_CPU_ARCH_PRE_V4,     ARM_ARCH_V2},
+    {TAG_CPU_ARCH_PRE_V4,     ARM_ARCH_V2S},
+    {TAG_CPU_ARCH_PRE_V4,     ARM_ARCH_V3},
+    {TAG_CPU_ARCH_PRE_V4,     ARM_ARCH_V3M},
+    {TAG_CPU_ARCH_V4,	      ARM_ARCH_V4xM},
+    {TAG_CPU_ARCH_V4,	      ARM_ARCH_V4},
+    {TAG_CPU_ARCH_V4T,	      ARM_ARCH_V4TxM},
+    {TAG_CPU_ARCH_V4T,	      ARM_ARCH_V4T},
+    {TAG_CPU_ARCH_V5T,	      ARM_ARCH_V5xM},
+    {TAG_CPU_ARCH_V5T,	      ARM_ARCH_V5},
+    {TAG_CPU_ARCH_V5T,	      ARM_ARCH_V5TxM},
+    {TAG_CPU_ARCH_V5T,	      ARM_ARCH_V5T},
+    {TAG_CPU_ARCH_V5TE,	      ARM_ARCH_V5TExP},
+    {TAG_CPU_ARCH_V5TE,	      ARM_ARCH_V5TE},
+    {TAG_CPU_ARCH_V5TEJ,      ARM_ARCH_V5TEJ},
+    {TAG_CPU_ARCH_V6,	      ARM_ARCH_V6},
+    {TAG_CPU_ARCH_V6KZ,	      ARM_ARCH_V6Z},
+    {TAG_CPU_ARCH_V6KZ,	      ARM_ARCH_V6KZ},
+    {TAG_CPU_ARCH_V6K,	      ARM_ARCH_V6K},
+    {TAG_CPU_ARCH_V6T2,	      ARM_ARCH_V6T2},
+    {TAG_CPU_ARCH_V6T2,	      ARM_ARCH_V6KT2},
+    {TAG_CPU_ARCH_V6T2,	      ARM_ARCH_V6ZT2},
+    {TAG_CPU_ARCH_V6T2,	      ARM_ARCH_V6KZT2},
 
     /* When assembling a file with only ARMv6-M or ARMv6S-M instruction, GNU as
        always selected build attributes to match those of ARMv6-M
@@ -27316,25 +27317,26 @@ static const cpu_arch_ver_table cpu_arch_ver[] =
        would be selected when fully respecting chronology of architectures.
        It is thus necessary to make a special case of ARMv6-M and ARMv6S-M and
        move them before ARMv7 architectures.  */
-    {TAG_CPU_ARCH_V6_M,	    ARM_ARCH_V6M},
-    {TAG_CPU_ARCH_V6S_M,    ARM_ARCH_V6SM},
-
-    {TAG_CPU_ARCH_V7,	    ARM_ARCH_V7},
-    {TAG_CPU_ARCH_V7,	    ARM_ARCH_V7A},
-    {TAG_CPU_ARCH_V7,	    ARM_ARCH_V7R},
-    {TAG_CPU_ARCH_V7,	    ARM_ARCH_V7M},
-    {TAG_CPU_ARCH_V7,	    ARM_ARCH_V7VE},
-    {TAG_CPU_ARCH_V7E_M,    ARM_ARCH_V7EM},
-    {TAG_CPU_ARCH_V8,	    ARM_ARCH_V8A},
-    {TAG_CPU_ARCH_V8,	    ARM_ARCH_V8_1A},
-    {TAG_CPU_ARCH_V8,	    ARM_ARCH_V8_2A},
-    {TAG_CPU_ARCH_V8,	    ARM_ARCH_V8_3A},
-    {TAG_CPU_ARCH_V8M_BASE, ARM_ARCH_V8M_BASE},
-    {TAG_CPU_ARCH_V8M_MAIN, ARM_ARCH_V8M_MAIN},
-    {TAG_CPU_ARCH_V8R,	    ARM_ARCH_V8R},
-    {TAG_CPU_ARCH_V8,	    ARM_ARCH_V8_4A},
-    {TAG_CPU_ARCH_V8,	    ARM_ARCH_V8_5A},
-    {-1,		    ARM_ARCH_NONE}
+    {TAG_CPU_ARCH_V6_M,	      ARM_ARCH_V6M},
+    {TAG_CPU_ARCH_V6S_M,      ARM_ARCH_V6SM},
+
+    {TAG_CPU_ARCH_V7,	      ARM_ARCH_V7},
+    {TAG_CPU_ARCH_V7,	      ARM_ARCH_V7A},
+    {TAG_CPU_ARCH_V7,	      ARM_ARCH_V7R},
+    {TAG_CPU_ARCH_V7,	      ARM_ARCH_V7M},
+    {TAG_CPU_ARCH_V7,	      ARM_ARCH_V7VE},
+    {TAG_CPU_ARCH_V7E_M,      ARM_ARCH_V7EM},
+    {TAG_CPU_ARCH_V8,	      ARM_ARCH_V8A},
+    {TAG_CPU_ARCH_V8,	      ARM_ARCH_V8_1A},
+    {TAG_CPU_ARCH_V8,	      ARM_ARCH_V8_2A},
+    {TAG_CPU_ARCH_V8,	      ARM_ARCH_V8_3A},
+    {TAG_CPU_ARCH_V8M_BASE,   ARM_ARCH_V8M_BASE},
+    {TAG_CPU_ARCH_V8M_MAIN,   ARM_ARCH_V8M_MAIN},
+    {TAG_CPU_ARCH_V8R,	      ARM_ARCH_V8R},
+    {TAG_CPU_ARCH_V8,	      ARM_ARCH_V8_4A},
+    {TAG_CPU_ARCH_V8,	      ARM_ARCH_V8_5A},
+    {TAG_CPU_ARCH_V8_1M_MAIN, ARM_ARCH_V8_1M_MAIN},
+    {-1,		      ARM_ARCH_NONE}
 };
 
 /* Set an attribute if it has not already been set by the user.  */
@@ -27417,7 +27419,7 @@ get_aeabi_cpu_arch_from_fset (const arm_feature_set *arch_ext_fset,
   if (ARM_FEATURE_EQUAL (*arch_ext_fset, arm_arch_any))
     {
       /* Force revisiting of decision for each new architecture.  */
-      gas_assert (MAX_TAG_CPU_ARCH <= TAG_CPU_ARCH_V8M_MAIN);
+      gas_assert (MAX_TAG_CPU_ARCH <= TAG_CPU_ARCH_V8_1M_MAIN);
       *profile = 'A';
       return TAG_CPU_ARCH_V8;
     }
@@ -27688,7 +27690,7 @@ aeabi_set_public_attributes (void)
      by the base architecture.
 
      For new architectures we will have to check these tests.  */
-  gas_assert (arch <= TAG_CPU_ARCH_V8M_MAIN);
+  gas_assert (arch <= TAG_CPU_ARCH_V8_1M_MAIN);
   if (ARM_CPU_HAS_FEATURE (flags, arm_ext_v8)
       || ARM_CPU_HAS_FEATURE (flags, arm_ext_v8m))
     aeabi_set_attribute_int (Tag_DIV_use, 0);