aes-ppc.pl, sha512-ppc.pl: comply even with Embedded ABI specification

(most restrictive about r2 and r13 usage).

crypto/aes/asm/aes-ppc.pl

@@ -68,7 +68,7 @@ $key="r5";
 $Tbl0="r3";
 $Tbl1="r6";
 $Tbl2="r7";
-$Tbl3="r2";
+$Tbl3=$out;	# stay away from "r2"; $out is offloaded to stack
 
 $s0="r8";
 $s1="r9";
@@ -76,7 +76,7 @@ $s2="r10";
 $s3="r11";
 
 $t0="r12";
-$t1="r13";
+$t1="r0";	# stay away from "r13";
 $t2="r14";
 $t3="r15";
 
@@ -100,9 +100,6 @@ $acc13="r29";
 $acc14="r30";
 $acc15="r31";
 
-# stay away from TLS pointer
-if ($SIZE_T==8)	{ die if ($t1 ne "r13");  $t1="r0";		}
-else		{ die if ($Tbl3 ne "r2"); $Tbl3=$t0; $t0="r0";	}
 $mask80=$Tbl2;
 $mask1b=$Tbl3;
 
@@ -337,8 +334,7 @@ $code.=<<___;
 	$STU	$sp,-$FRAME($sp)
 	mflr	r0
 
-	$PUSH	$toc,`$FRAME-$SIZE_T*20`($sp)
-	$PUSH	r13,`$FRAME-$SIZE_T*19`($sp)
+	$PUSH	$out,`$FRAME-$SIZE_T*19`($sp)
 	$PUSH	r14,`$FRAME-$SIZE_T*18`($sp)
 	$PUSH	r15,`$FRAME-$SIZE_T*17`($sp)
 	$PUSH	r16,`$FRAME-$SIZE_T*16`($sp)
@@ -371,6 +367,7 @@ Lenc_unaligned_ok:
 	lwz	$s3,12($inp)
 	bl	LAES_Te
 	bl	Lppc_AES_encrypt_compact
+	$POP	$out,`$FRAME-$SIZE_T*19`($sp)
 	stw	$s0,0($out)
 	stw	$s1,4($out)
 	stw	$s2,8($out)
@@ -417,6 +414,7 @@ Lenc_xpage:
 
 	bl	LAES_Te
 	bl	Lppc_AES_encrypt_compact
+	$POP	$out,`$FRAME-$SIZE_T*19`($sp)
 
 	extrwi	$acc00,$s0,8,0
 	extrwi	$acc01,$s0,8,8
@@ -449,8 +447,6 @@ Lenc_xpage:
 
 Lenc_done:
 	$POP	r0,`$FRAME+$LRSAVE`($sp)
-	$POP	$toc,`$FRAME-$SIZE_T*20`($sp)
-	$POP	r13,`$FRAME-$SIZE_T*19`($sp)
 	$POP	r14,`$FRAME-$SIZE_T*18`($sp)
 	$POP	r15,`$FRAME-$SIZE_T*17`($sp)
 	$POP	r16,`$FRAME-$SIZE_T*16`($sp)
@@ -771,8 +767,7 @@ Lenc_compact_done:
 	$STU	$sp,-$FRAME($sp)
 	mflr	r0
 
-	$PUSH	$toc,`$FRAME-$SIZE_T*20`($sp)
-	$PUSH	r13,`$FRAME-$SIZE_T*19`($sp)
+	$PUSH	$out,`$FRAME-$SIZE_T*19`($sp)
 	$PUSH	r14,`$FRAME-$SIZE_T*18`($sp)
 	$PUSH	r15,`$FRAME-$SIZE_T*17`($sp)
 	$PUSH	r16,`$FRAME-$SIZE_T*16`($sp)
@@ -805,6 +800,7 @@ Ldec_unaligned_ok:
 	lwz	$s3,12($inp)
 	bl	LAES_Td
 	bl	Lppc_AES_decrypt_compact
+	$POP	$out,`$FRAME-$SIZE_T*19`($sp)
 	stw	$s0,0($out)
 	stw	$s1,4($out)
 	stw	$s2,8($out)
@@ -851,6 +847,7 @@ Ldec_xpage:
 
 	bl	LAES_Td
 	bl	Lppc_AES_decrypt_compact
+	$POP	$out,`$FRAME-$SIZE_T*19`($sp)
 
 	extrwi	$acc00,$s0,8,0
 	extrwi	$acc01,$s0,8,8
@@ -883,8 +880,6 @@ Ldec_xpage:
 
 Ldec_done:
 	$POP	r0,`$FRAME+$LRSAVE`($sp)
-	$POP	$toc,`$FRAME-$SIZE_T*20`($sp)
-	$POP	r13,`$FRAME-$SIZE_T*19`($sp)
 	$POP	r14,`$FRAME-$SIZE_T*18`($sp)
 	$POP	r15,`$FRAME-$SIZE_T*17`($sp)
 	$POP	r16,`$FRAME-$SIZE_T*16`($sp)

crypto/sha/asm/sha512-ppc.pl

@@ -110,7 +110,7 @@ $B  ="r9";
 $C  ="r10";
 $D  ="r11";
 $E  ="r12";
-$F  ="r13";	$F="r2" if ($SIZE_T==8);# reassigned to exempt TLS pointer
+$F  =$t1;	$t1 = "r0";	# stay away from "r13";
 $G  ="r14";
 $H  ="r15";
 
@@ -123,19 +123,18 @@ $inp="r31";	# reassigned $inp! aliases with @X[15]
 sub ROUND_00_15 {
 my ($i,$a,$b,$c,$d,$e,$f,$g,$h)=@_;
 $code.=<<___;
-	$LD	$T,`$i*$SZ`($Tbl)
 	$ROR	$a0,$e,$Sigma1[0]
 	$ROR	$a1,$e,$Sigma1[1]
 	and	$t0,$f,$e
-	andc	$t1,$g,$e
-	add	$T,$T,$h
 	xor	$a0,$a0,$a1
+	add	$h,$h,$t1
+	andc	$t1,$g,$e
 	$ROR	$a1,$a1,`$Sigma1[2]-$Sigma1[1]`
 	or	$t0,$t0,$t1		; Ch(e,f,g)
-	add	$T,$T,@X[$i]
+	add	$h,$h,@X[$i%16]
 	xor	$a0,$a0,$a1		; Sigma1(e)
-	add	$T,$T,$t0
-	add	$T,$T,$a0
+	add	$h,$h,$t0
+	add	$h,$h,$a0
 
 	$ROR	$a0,$a,$Sigma0[0]
 	$ROR	$a1,$a,$Sigma0[1]
@@ -146,9 +145,14 @@ $code.=<<___;
 	xor	$t0,$t0,$t1
 	and	$t1,$b,$c
 	xor	$a0,$a0,$a1		; Sigma0(a)
-	add	$d,$d,$T
+	add	$d,$d,$h
 	xor	$t0,$t0,$t1		; Maj(a,b,c)
-	add	$h,$T,$a0
+___
+$code.=<<___ if ($i<15);
+	$LD	$t1,`($i+1)*$SZ`($Tbl)
+___
+$code.=<<___;
+	add	$h,$h,$a0
 	add	$h,$h,$t0
 
 ___
@@ -169,10 +173,11 @@ $code.=<<___;
 	add	@X[$i],@X[$i],@X[($i+9)%16]
 	xor	$a0,$a0,$a1		; sigma0(X[(i+1)&0x0f])
 	xor	$t0,$t0,$t1		; sigma1(X[(i+14)&0x0f])
+	$LD	$t1,`$i*$SZ`($Tbl)
 	add	@X[$i],@X[$i],$a0
 	add	@X[$i],@X[$i],$t0
 ___
-&ROUND_00_15($i,$a,$b,$c,$d,$e,$f,$g,$h);
+&ROUND_00_15($i+16,$a,$b,$c,$d,$e,$f,$g,$h);
 }
 
 $code=<<___;
@@ -188,8 +193,6 @@ $func:
 
 	$PUSH	$ctx,`$FRAME-$SIZE_T*22`($sp)
 
-	$PUSH	$toc,`$FRAME-$SIZE_T*20`($sp)
-	$PUSH	r13,`$FRAME-$SIZE_T*19`($sp)
 	$PUSH	r14,`$FRAME-$SIZE_T*18`($sp)
 	$PUSH	r15,`$FRAME-$SIZE_T*17`($sp)
 	$PUSH	r16,`$FRAME-$SIZE_T*16`($sp)
@@ -283,8 +286,6 @@ Lmemcpy:
 
 Ldone:
 	$POP	r0,`$FRAME+$LRSAVE`($sp)
-	$POP	$toc,`$FRAME-$SIZE_T*20`($sp)
-	$POP	r13,`$FRAME-$SIZE_T*19`($sp)
 	$POP	r14,`$FRAME-$SIZE_T*18`($sp)
 	$POP	r15,`$FRAME-$SIZE_T*17`($sp)
 	$POP	r16,`$FRAME-$SIZE_T*16`($sp)
@@ -312,6 +313,7 @@ Ldone:
 
 .align	4
 Lsha2_block_private:
+	$LD	$t1,0($Tbl)
 ___
 for($i=0;$i<16;$i++) {
 $code.=<<___ if ($SZ==4);
@@ -328,8 +330,8 @@ ___
 	unshift(@V,pop(@V));
 }
 $code.=<<___;
-	li	$T,`$rounds/16-1`
-	mtctr	$T
+	li	$t0,`$rounds/16-1`
+	mtctr	$t0
 .align	4
 Lrounds:
 	addi	$Tbl,$Tbl,`16*$SZ`