RISC-V: Add GNU_PROPERTY_RISCV_FEATURE_1_CFI_SS and GNU_PROPERTY_RISCV_FEATURE_1_CFI_LP_UNLABELED

This patch adds two new GNU properties for RISC-V:
GNU_PROPERTY_RISCV_FEATURE_1_CFI_SS and GNU_PROPERTY_RISCV_FEATURE_1_CFI_LP_UNLABELED.

We only add readelf and define the properties in this patch.

Ref: riscv-non-isa/riscv-elf-psabi-doc#417

Author: kito-cheng

binutils/readelf.c

@@ -21872,6 +21872,33 @@ decode_aarch64_feature_1_and (unsigned int bitmask)
     }
 }
 
+static void
+decode_riscv_feature_1_and (unsigned int bitmask)
+{
+  while (bitmask)
+    {
+      unsigned int bit = bitmask & (- bitmask);
+
+      bitmask &= ~ bit;
+      switch (bit)
+	{
+	case GNU_PROPERTY_RISCV_FEATURE_1_CFI_LP_UNLABELED:
+	  printf ("CFI_LP_UNLABELED");
+	  break;
+
+	case GNU_PROPERTY_RISCV_FEATURE_1_CFI_SS:
+	  printf ("CFI_SS");
+	  break;
+
+	default:
+	  printf (_("<unknown: %x>"), bit);
+	  break;
+	}
+      if (bitmask)
+	printf (", ");
+    }
+}
+
 static void
 decode_1_needed (unsigned int bitmask)
 {
@@ -22062,6 +22089,18 @@ print_gnu_property_note (Filedata * filedata, Elf_Internal_Note * pnote)
 		  goto next;
 		}
 	    }
+	  else if (filedata->file_header.e_machine == EM_RISCV)
+	    {
+	      if (type == GNU_PROPERTY_RISCV_FEATURE_1_AND)
+		{
+		  printf ("RISC-V AND feature: ");
+		  if (datasz != 4)
+		    printf (_("<corrupt length: %#x> "), datasz);
+		  else
+		    decode_riscv_feature_1_and (byte_get (ptr, 4));
+		  goto next;
+		}
+	    }
 	}
       else
 	{

binutils/testsuite/binutils-all/riscv/property-cfi-lp-unlabeled.d

@@ -0,0 +1,8 @@
+#as: -defsym __property_zicfilp_unlabeled__=1 -march=rv64i -mabi=lp64
+#readelf: -n
+#source: property.s
+
+Displaying notes found in: .note.gnu.property
+[ 	]+Owner[ 	]+Data size[ 	]+Description
+[ 	]+GNU[ 	]+0x00000010[ 	]+NT_GNU_PROPERTY_TYPE_0
+[ 	]+Properties: RISC-V AND feature: CFI_LP_UNLABELED

binutils/testsuite/binutils-all/riscv/property-cfi-ss.d

@@ -0,0 +1,8 @@
+#as: -defsym __property_zicfiss__=1 -march=rv64i -mabi=lp64
+#readelf: -n
+#source: property.s
+
+Displaying notes found in: .note.gnu.property
+[ 	]+Owner[ 	]+Data size[ 	]+Description
+[ 	]+GNU[ 	]+0x00000010[ 	]+NT_GNU_PROPERTY_TYPE_0
+[ 	]+Properties: RISC-V AND feature: CFI_SS

binutils/testsuite/binutils-all/riscv/property.s

@@ -0,0 +1,41 @@
+	.text
+	.globl _start
+	.type _start,@function
+_start:
+    ret
+
+.ifdef __property_zicfilp_unlabeled__
+	.section ".note.gnu.property", "a"
+	.p2align 3
+	.long 1f - 0f		/* name length */
+	.long 5f - 2f		/* data length */
+	.long 5			/* note type */
+0:	.asciz "GNU"		/* vendor name */
+1:
+	.p2align 3
+2:	.long 0xc0000000	/* pr_type.  */
+	.long 4f - 3f		/* pr_datasz.  */
+3:
+	.long 0x1		/* GNU_PROPERTY_RISCV_FEATURE_1_CFI_LP_UNLABELED.  */
+4:
+	.p2align 3
+5:
+.endif
+
+.ifdef __property_zicfiss__
+	.section ".note.gnu.property", "a"
+	.p2align 3
+	.long 1f - 0f		/* name length */
+	.long 5f - 2f		/* data length */
+	.long 5			/* note type */
+0:	.asciz "GNU"		/* vendor name */
+1:
+	.p2align 3
+2:	.long 0xc0000000	/* pr_type.  */
+	.long 4f - 3f		/* pr_datasz.  */
+3:
+	.long 0x2		/* GNU_PROPERTY_RISCV_FEATURE_1_CFI_SS.  */
+4:
+	.p2align 3
+5:
+.endif

include/elf/common.h

@@ -1042,6 +1042,11 @@
 #define GNU_PROPERTY_AARCH64_FEATURE_1_PAC	(1U << 1)
 #define GNU_PROPERTY_AARCH64_FEATURE_1_GCS	(1U << 2)
 
+/* RISC-V specific GNU PROPERTY. */
+#define GNU_PROPERTY_RISCV_FEATURE_1_AND	0xc0000000
+#define GNU_PROPERTY_RISCV_FEATURE_1_CFI_LP_UNLABELED	(1U << 0)
+#define GNU_PROPERTY_RISCV_FEATURE_1_CFI_SS		(1U << 1)
+
 /* Values used in GNU .note.ABI-tag notes (NT_GNU_ABI_TAG).  */
 #define GNU_ABI_TAG_LINUX	0
 #define GNU_ABI_TAG_HURD	1