From a11213dc4a5db7b7eed540233cb66cca483d1ea5 Mon Sep 17 00:00:00 2001
From: Stuart Henderson <sthen@cvs.openbsd.org>
Date: Thu, 5 Jul 2018 14:27:53 +0000
Subject: backout r1.11 "Add retguard macros for kernel asm", ok deraadt

after starting iked kernel enters ddb with:

Stopped at      aesni_ctr_enc+0xd8:     int     $3
---
 sys/arch/amd64/amd64/aes_intel.S | 58 +---------------------------------------
 1 file changed, 1 insertion(+), 57 deletions(-)

(limited to 'sys')

diff --git a/sys/arch/amd64/amd64/aes_intel.S b/sys/arch/amd64/amd64/aes_intel.S
index c463d679cf4..e90d2c00af6 100644
--- a/sys/arch/amd64/amd64/aes_intel.S
+++ b/sys/arch/amd64/amd64/aes_intel.S
@@ -1,4 +1,4 @@
-/*	$OpenBSD: aes_intel.S,v 1.11 2018/07/03 23:21:15 mortimer Exp $	*/
+/*	$OpenBSD: aes_intel.S,v 1.12 2018/07/05 14:27:52 sthen Exp $	*/
 
 /*
  * Implement AES algorithm in Intel AES-NI instructions.
@@ -106,7 +106,6 @@
 
 _key_expansion_128:
 _key_expansion_256a:
-	RETGUARD_SETUP(_key_expansion_128, rax)
 	pshufd	$0b11111111,%xmm1,%xmm1
 	shufps	$0b00010000,%xmm0,%xmm4
 	pxor	%xmm4,%xmm0
@@ -115,11 +114,9 @@ _key_expansion_256a:
 	pxor	%xmm1,%xmm0
 	movaps	%xmm0,(%rcx)
 	add	$0x10,%rcx
-	RETGUARD_CHECK(_key_expansion_128, rax)
 	ret
 
 _key_expansion_192a:
-	RETGUARD_SETUP(_key_expansion_192a, rax)
 	pshufd	$0b01010101,%xmm1,%xmm1
 	shufps	$0b00010000,%xmm0,%xmm4
 	pxor	%xmm4,%xmm0
@@ -140,11 +137,9 @@ _key_expansion_192a:
 	shufps	$0b01001110,%xmm2,%xmm1
 	movaps	%xmm1,16(%rcx)
 	add	$0x20,%rcx
-	RETGUARD_CHECK(_key_expansion_192a, rax)
 	ret
 
 _key_expansion_192b:
-	RETGUARD_SETUP(_key_expansion_192b, rax)
 	pshufd	$0b01010101,%xmm1,%xmm1
 	shufps	$0b00010000,%xmm0,%xmm4
 	pxor	%xmm4,%xmm0
@@ -160,11 +155,9 @@ _key_expansion_192b:
 
 	movaps	%xmm0,(%rcx)
 	add	$0x10,%rcx
-	RETGUARD_CHECK(_key_expansion_192b, rax)
 	ret
 
 _key_expansion_256b:
-	RETGUARD_SETUP(_key_expansion_256b, rax)
 	pshufd	$0b10101010,%xmm1,%xmm1
 	shufps	$0b00010000,%xmm2,%xmm4
 	pxor	%xmm4,%xmm2
@@ -173,14 +166,12 @@ _key_expansion_256b:
 	pxor	%xmm1,%xmm2
 	movaps	%xmm2,(%rcx)
 	add	$0x10,%rcx
-	RETGUARD_CHECK(_key_expansion_256b, rax)
 	ret
 
 /*
  * void aesni_set_key(struct aesni_session *ses, uint8_t *key, size_t len)
  */
 ENTRY(aesni_set_key)
-	RETGUARD_SETUP(aesni_set_key, r11)
 	movups	(%rsi),%xmm0		# user key (first 16 bytes)
 	movaps	%xmm0,(%rdi)
 	lea	0x10(%rdi),%rcx		# key addr
@@ -276,19 +267,16 @@ ENTRY(aesni_set_key)
 	sub	$0x10,%rsi
 	cmp	%rcx,%rdi
 	jb	4b
-	RETGUARD_CHECK(aesni_set_key, r11)
 	ret
 
 /*
  * void aesni_enc(struct aesni_session *ses, uint8_t *dst, uint8_t *src)
  */
 ENTRY(aesni_enc)
-	RETGUARD_SETUP(aesni_enc, r11)
 	movl	480(KEYP),KLEN		# key length
 	movups	(INP),STATE		# input
 	call	_aesni_enc1
 	movups	STATE,(OUTP)		# output
-	RETGUARD_CHECK(aesni_enc, r11)
 	ret
 
 /*
@@ -304,7 +292,6 @@ ENTRY(aesni_enc)
  *	TKEYP (T1)
  */
 _aesni_enc1:
-	RETGUARD_SETUP(_aesni_enc1, rax)
 	movaps	(KEYP),KEY		# key
 	mov	KEYP,TKEYP
 	pxor	KEY,STATE		# round 0
@@ -346,7 +333,6 @@ _aesni_enc1:
 	aesenc	KEY,STATE
 	movaps	0x70(TKEYP),KEY
 	aesenclast KEY,STATE
-	RETGUARD_CHECK(_aesni_enc1, rax)
 	ret
 
 /*
@@ -368,7 +354,6 @@ _aesni_enc1:
  *	TKEYP (T1)
  */
 _aesni_enc4:
-	RETGUARD_SETUP(_aesni_enc4, rax)
 	movaps	(KEYP),KEY		# key
 	mov	KEYP,TKEYP
 	pxor	KEY,STATE1		# round 0
@@ -455,20 +440,17 @@ _aesni_enc4:
 	aesenclast KEY,STATE2
 	aesenclast KEY,STATE3
 	aesenclast KEY,STATE4
-	RETGUARD_CHECK(_aesni_enc4, rax)
 	ret
 
 /*
  * void aesni_dec(struct aesni_session *ses, uint8_t *dst, uint8_t *src)
  */
 ENTRY(aesni_dec)
-	RETGUARD_SETUP(aesni_dec, r11)
 	mov	480(KEYP),KLEN		# key length
 	add	$240,KEYP
 	movups	(INP),STATE		# input
 	call	_aesni_dec1
 	movups	STATE,(OUTP)		# output
-	RETGUARD_CHECK(aesni_dec, r11)
 	ret
 
 /*
@@ -484,7 +466,6 @@ ENTRY(aesni_dec)
  *	TKEYP (T1)
  */
 _aesni_dec1:
-	RETGUARD_SETUP(_aesni_dec1, rax)
 	movaps	(KEYP),KEY		# key
 	mov	KEYP,TKEYP
 	pxor	KEY,STATE		# round 0
@@ -526,7 +507,6 @@ _aesni_dec1:
 	aesdec	KEY,STATE
 	movaps	0x70(TKEYP),KEY
 	aesdeclast KEY,STATE
-	RETGUARD_CHECK(_aesni_dec1, rax)
 	ret
 
 /*
@@ -548,7 +528,6 @@ _aesni_dec1:
  *	TKEYP (T1)
  */
 _aesni_dec4:
-	RETGUARD_SETUP(_aesni_dec4, rax)
 	movaps	(KEYP),KEY		# key
 	mov	KEYP,TKEYP
 	pxor	KEY,STATE1		# round 0
@@ -635,7 +614,6 @@ _aesni_dec4:
 	aesdeclast KEY,STATE2
 	aesdeclast KEY,STATE3
 	aesdeclast KEY,STATE4
-	RETGUARD_CHECK(_aesni_dec4, rax)
 	ret
 
 #if 0
@@ -644,7 +622,6 @@ _aesni_dec4:
  *     size_t len)
  */
 ENTRY(aesni_ecb_enc)
-	RETGUARD_SETUP(aesni_ecb_enc, r11)
 	test	LEN,LEN			# check length
 	jz	3f
 	mov	480(KEYP),KLEN
@@ -681,7 +658,6 @@ ENTRY(aesni_ecb_enc)
 	cmp	$16,LEN
 	jge	2b
 3:
-	RETGUARD_CHECK(aesni_ecb_enc, r11)
 	ret
 
 /*
@@ -689,7 +665,6 @@ ENTRY(aesni_ecb_enc)
  *     size_t len);
  */
 ENTRY(aesni_ecb_dec)
-	RETGUARD_SETUP(aesni_ecb_dec, r11)
 	test	LEN,LEN
 	jz	3f
 	mov	480(KEYP),KLEN
@@ -727,7 +702,6 @@ ENTRY(aesni_ecb_dec)
 	cmp	$16,LEN
 	jge	2b
 3:
-	RETGUARD_CHECK(aesni_ecb_dec, r11)
 	ret
 #endif
 
@@ -736,7 +710,6 @@ ENTRY(aesni_ecb_dec)
  *     size_t len, uint8_t *iv)
  */
 ENTRY(aesni_cbc_enc)
-	RETGUARD_SETUP(aesni_cbc_enc, r11)
 	cmp	$16,LEN
 	jb	2f
 	mov	480(KEYP),KLEN
@@ -754,7 +727,6 @@ ENTRY(aesni_cbc_enc)
 	jge	1b
 	movups	STATE,(IVP)
 2:
-	RETGUARD_CHECK(aesni_cbc_enc, r11)
 	ret
 
 /*
@@ -762,7 +734,6 @@ ENTRY(aesni_cbc_enc)
  *     size_t len, uint8_t *iv)
  */
 ENTRY(aesni_cbc_dec)
-	RETGUARD_SETUP(aesni_cbc_dec, r11)
 	cmp	$16,LEN
 	jb	4f
 	mov	480(KEYP),KLEN
@@ -813,7 +784,6 @@ ENTRY(aesni_cbc_dec)
 3:
 	movups	IV,(IVP)
 4:
-	RETGUARD_CHECK(aesni_cbc_dec, r11)
 	ret
 
 /*
@@ -829,7 +799,6 @@ ENTRY(aesni_cbc_dec)
  *	BSWAP_MASK	== endian swapping mask
  */
 _aesni_inc_init:
-	RETGUARD_SETUP(_aesni_inc_init, rax)
 	movdqa	CTR,IV
 	pslldq	$8,IV
 	movdqu	.Lbswap_mask,BSWAP_MASK
@@ -837,7 +806,6 @@ _aesni_inc_init:
 	mov	$1,TCTR_LOW
 	movd	TCTR_LOW,INC
 	movd	CTR,TCTR_LOW
-	RETGUARD_CHECK(_aesni_inc_init, rax)
 	ret
 
 /*
@@ -856,7 +824,6 @@ _aesni_inc_init:
  *	TCTR_LOW:	== lower dword of CTR
  */
 _aesni_inc:
-	RETGUARD_SETUP(_aesni_inc, rax)
 	paddq	INC,CTR
 	add	$1,TCTR_LOW
 	jnc	1f
@@ -866,7 +833,6 @@ _aesni_inc:
 1:
 	movaps	CTR,IV
 	pshufb	BSWAP_MASK,IV
-	RETGUARD_CHECK(_aesni_inc, rax)
 	ret
 
 /*
@@ -874,7 +840,6 @@ _aesni_inc:
  *     size_t len, uint8_t *icb)
  */
 ENTRY(aesni_ctr_enc)
-	RETGUARD_SETUP(aesni_ctr_enc, r10)
 	cmp	$16,LEN
 	jb	4f
 	mov	480(KEYP),KLEN
@@ -928,11 +893,9 @@ ENTRY(aesni_ctr_enc)
 3:
 	movq	IV,(IVP)
 4:
-	RETGUARD_CHECK(aesni_ctr_enc, r10)
 	ret
 
 _aesni_gmac_gfmul:
-	RETGUARD_SETUP(_aesni_gmac_gfmul, rax)
 	movdqa	%xmm0,%xmm3
 	pclmulqdq $0x00,%xmm1,%xmm3	# xmm3 holds a0*b0
 	movdqa	%xmm0,%xmm4
@@ -996,14 +959,12 @@ _aesni_gmac_gfmul:
 	pxor	%xmm8,%xmm2
 	pxor	%xmm2,%xmm3
 	pxor	%xmm3,%xmm6		# the result is in xmm6
-	RETGUARD_CHECK(_aesni_gmac_gfmul, rax)
 	ret
 
 /*
  * void aesni_gmac_update(GHASH_CTX *ghash, uint8_t *src, size_t len)
  */
 ENTRY(aesni_gmac_update)
-	RETGUARD_SETUP(aesni_gmac_update, r11)
 	cmp	$16,%rdx
 	jb	2f
 
@@ -1029,7 +990,6 @@ ENTRY(aesni_gmac_update)
 	movdqu	%xmm6,16(%rdi)
 	movdqu	%xmm6,32(%rdi)
 2:
-	RETGUARD_CHECK(aesni_gmac_update, r11)
 	ret
 
 /*
@@ -1037,14 +997,12 @@ ENTRY(aesni_gmac_update)
  *     uint8_t *icb, uint8_t *hashstate)
  */
 ENTRY(aesni_gmac_final)
-	RETGUARD_SETUP(aesni_gmac_final, r11)
 	movl	480(KEYP),KLEN		# key length
 	movdqu	(INP),STATE		# icb
 	call	_aesni_enc1
 	movdqu	(HSTATE),IN
 	pxor	IN,STATE
 	movdqu	STATE,(OUTP)		# output
-	RETGUARD_CHECK(aesni_gmac_final, r11)
 	ret
 
 /*
@@ -1052,8 +1010,6 @@ ENTRY(aesni_gmac_final)
  *    size_t len, uint8_t *iv)
  */
 ENTRY(aesni_xts_enc)
-	RETGUARD_SETUP(aesni_xts_enc, r11)
-	RETGUARD_PUSH(r11)
 	cmp	$16,%rcx
 	jb	2f
 
@@ -1075,8 +1031,6 @@ ENTRY(aesni_xts_enc)
 	cmp	$16,%rcx
 	jge	1b
 2:
-	RETGUARD_POP(r11)
-	RETGUARD_CHECK(aesni_xts_enc, r11)
 	ret
 
 /*
@@ -1084,8 +1038,6 @@ ENTRY(aesni_xts_enc)
  *    size_t len, uint8_t *iv)
  */
 ENTRY(aesni_xts_dec)
-	RETGUARD_SETUP(aesni_xts_dec, r11)
-	RETGUARD_PUSH(r11)
 	cmp	$16,%rcx
 	jb	2f
 
@@ -1108,8 +1060,6 @@ ENTRY(aesni_xts_dec)
 	cmp	$16,%rcx
 	jge	1b
 2:
-	RETGUARD_POP(r11)
-	RETGUARD_CHECK(aesni_xts_dec, r11)
 	ret
 
 /*
@@ -1120,8 +1070,6 @@ ENTRY(aesni_xts_dec)
  * xts is in %rdi, iv is in %r8 and we return the tweak in %xmm3.
  */
 _aesni_xts_tweak:
-	RETGUARD_SETUP(_aesni_xts_tweak, rax)
-	RETGUARD_PUSH(rax)
 	mov	(%r8),%r10
 	movd	%r10,%xmm0		# Last 64-bits of IV are always zero.
 	mov	KEYP,%r11
@@ -1130,15 +1078,12 @@ _aesni_xts_tweak:
 	call	_aesni_enc1
 	movdqa	%xmm0,%xmm3
 	mov	%r11,KEYP
-	RETGUARD_POP(rax)
-	RETGUARD_CHECK(_aesni_xts_tweak, rax)
 	ret
 
 /*
  * Exponentiate AES XTS tweak (in %xmm3).
  */
 _aesni_xts_tweak_exp:
-	RETGUARD_SETUP(_aesni_xts_tweak_exp, rax)
 	pextrw	$7,%xmm3,%r10
 	pextrw	$3,%xmm3,%r11
 	psllq	$1,%xmm3		# Left shift.
@@ -1156,5 +1101,4 @@ _aesni_xts_tweak_exp:
 	xor	$0x87,%r11		# AES XTS alpha - GF(2^128).
 	pinsrw	$0,%r11,%xmm3
 2:
-	RETGUARD_CHECK(_aesni_xts_tweak_exp, rax)
 	ret
-- 
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