asm/arm-xlate.pl: recognize -mbranch-protection.

Author: dot-asm

src/asm/arm-xlate.pl

@@ -330,13 +330,13 @@
 } if ($flavour =~ /ios64/);
 
 my $paciasp = sub {
-    ($flavour =~ /linux|cheri/) ? "\t.inst\t0xd503233f"
-                                : &$inst(0xd503233f);
+    ($flavour =~ /linux|cheri/) ? "\thint\t#PACI_HINT"
+                                : "\thint\t#25";
 };
 
 my $autiasp = sub {
-    ($flavour =~ /linux|cheri/) ? "\t.inst\t0xd50323bf"
-                                : &$inst(0xd50323bf);
+    ($flavour =~ /linux|cheri/) ? "\thint\t#AUTI_HINT"
+                                : "\thint\t#29";
 };
 
 sub range {
@@ -400,6 +400,17 @@ sub expand_line {
     print<<___;
  GBLA __SIZEOF_POINTER__
 __SIZEOF_POINTER__ SETA $1/8
+___
+} elsif ($flavour =~ /linux|cheri/) {
+    print<<___;
+#if defined(__ARM_FEATURE_PAC_DEFAULT) && __ARM_FEATURE_PAC_DEFAULT==2
+# define PACI_HINT 27
+# define AUTI_HINT 31
+#else
+# define PACI_HINT 25
+# define AUTI_HINT 29
+#endif
+
 ___
 }
 
@@ -474,6 +485,22 @@ sub expand_line {
     print "\n";
 }
 
-print "\tEND\n" if ($flavour =~ /win/);
+if ($flavour =~ /win/) {
+    print "\tEND\n";
+} elsif ($flavour =~ /linux|cheri/) {
+    # -mbranch-protection=standanrd segment, snatched from compiler -S output
+    print <<___;
+
+#if defined(__ARM_FEATURE_BTI_DEFAULT) || defined(__ARM_FEATURE_PAC_DEFAULT)
+.section	.note.GNU-stack,"",\@progbits
+.section	.note.gnu.property,"a",\@note
+	.long	4,2f-1f,5
+	.byte	0x47,0x4E,0x55,0
+1:	.long	0xc0000000,4,3
+.align  3
+2:
+#endif
+___
+}
 
 close STDOUT;