aarch64: fix branch target indications in arm64cpuid.pl and keccak1600

Add missing AARCH64_VALID_CALL_TARGET to armv8_rng_probe(). Also add
these to the functions defined by gen_random(), and note that this Perl
sub prints the assembler out directly, not going via the $code xlate
mechanism (and therefore coming before the include of arm_arch.h). So
fix this too.

In KeccakF1600_int, AARCH64_SIGN_LINK_REGISTER functions as
AARCH64_VALID_CALL_TARGET on BTI-only builds, so it needs to come before
the 'adr' line.

Change-Id: If241efe71591c88253a3e36647ced00300c3c1a3

Reviewed-by: Tomas Mraz <tomas@openssl.org>
Reviewed-by: Paul Dale <pauli@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/17653)

1 files changed, 6 insertions, 3 deletions

diff --git a/crypto/arm64cpuid.pl b/crypto/arm64cpuid.pl
index ebea4be59c..3ba593a488 100755
--- a/crypto/arm64cpuid.pl
+++ b/crypto/arm64cpuid.pl
@@ -189,6 +189,7 @@ CRYPTO_memcmp:
 .globl	_armv8_rng_probe
 .type	_armv8_rng_probe,%function
 _armv8_rng_probe:
+	AARCH64_VALID_CALL_TARGET
 	mrs	x0, s3_3_c2_c4_0	// rndr
 	mrs	x0, s3_3_c2_c4_1	// rndrrs
 	ret
@@ -199,7 +200,7 @@ sub gen_random {
 my $rdop = shift;
 my $rand_reg = $rdop eq "rndr" ? "s3_3_c2_c4_0" : "s3_3_c2_c4_1";
 
-print<<___;
+return <<___;
 // Fill buffer with Randomly Generated Bytes
 // inputs:  char * in x0 - Pointer to buffer
 //          size_t in x1 - Number of bytes to write to buffer
@@ -208,6 +209,7 @@ print<<___;
 .type	OPENSSL_${rdop}_asm,%function
 .align	4
 OPENSSL_${rdop}_asm:
+	AARCH64_VALID_CALL_TARGET
 	mov	x2,xzr
 	mov	x3,xzr
 
@@ -244,8 +246,9 @@ OPENSSL_${rdop}_asm:
 .size	OPENSSL_${rdop}_asm,.-OPENSSL_${rdop}_asm
 ___
 }
-gen_random("rndr");
-gen_random("rndrrs");
+
+$code .= gen_random("rndr");
+$code .= gen_random("rndrrs");
 
 print $code;
 close STDOUT or die "error closing STDOUT: $!";