[PATCH 3/8] crypto: x86/sha - add kernel-doc comments to assembly

Robert Elliott
2022-12-15T06:44:46Z

Remove .align directives that are overridden by SYM_FUNC_START
(which includes .align 4).

Signed-off-by: Robert Elliott <elliott@hpe.com>
---
arch/x86/crypto/sha1_avx2_x86_64_asm.S | 32 +++++++++++------------
arch/x86/crypto/sha1_ni_asm.S | 22 +++++++++-------
arch/x86/crypto/sha1_ssse3_asm.S | 33 +++++++++++++++--------
arch/x86/crypto/sha256-avx-asm.S | 24 ++++++++++-------
arch/x86/crypto/sha256-avx2-asm.S | 25 +++++++++++-------
arch/x86/crypto/sha256-ssse3-asm.S | 26 +++++++++++--------
arch/x86/crypto/sha256_ni_asm.S | 25 +++++++++---------
arch/x86/crypto/sha512-avx-asm.S | 33 +++++++++++------------
arch/x86/crypto/sha512-avx2-asm.S | 34 ++++++++++++------------
arch/x86/crypto/sha512-ssse3-asm.S | 36 ++++++++++++--------------
10 files changed, 161 insertions(+), 129 deletions(-)

diff --git a/arch/x86/crypto/sha1_avx2_x86_64_asm.S b/arch/x86/crypto/sha1_avx2_x86_64_asm.S
index a96b2fd26dab..c3ee9334cb0f 100644
--- a/arch/x86/crypto/sha1_avx2_x86_64_asm.S
+++ b/arch/x86/crypto/sha1_avx2_x86_64_asm.S
@@ -62,11 +62,6 @@
*Visit http://software.intel.com/en-us/articles/
*and refer to improving-the-performance-of-the-secure-hash-algorithm-1/
*
- *Updates 20-byte SHA-1 record at start of 'state', from 'input', for
- *even number of 'blocks' consecutive 64-byte blocks.
- *
- *extern "C" void sha1_transform_avx2(
- * struct sha1_state *state, const u8* input, int blocks );
*/

#include <linux/linkage.h>
@@ -629,13 +624,22 @@ _loop3:
_end:

.endm
-/*
- * macro implements SHA-1 function's body for several 64-byte blocks
- * param: function's name
- */
-.macro SHA1_VECTOR_ASM name
- SYM_FUNC_START(\name)

+.text
+
+/**
+ * sha1_transform_avx2 - Calculate SHA1 hash using the x86 AVX2 feature set
+ * @digest: address of current 20-byte hash value (%rdi, CTX macro)
+ * @data: address of data (%rsi, BUF macro);
+ * data size must be a multiple of 64 bytes
+ * @blocks: number of 64-byte blocks (%rdx, CNT macro)
+ *
+ * This function supports 64-bit CPUs.
+ *
+ * Return: none
+ * Prototype: asmlinkage void sha1_transform_avx2(u32 *digest, const u8 *data, int blocks)
+ */
+SYM_FUNC_START(sha1_transform_avx2)
push %rbx
push %r12
push %r13
@@ -675,9 +679,7 @@ _loop3:
pop %rbx

RET
-
- SYM_FUNC_END(\name)
-.endm
+SYM_FUNC_END(sha1_transform_avx2)

.section .rodata

@@ -706,6 +708,4 @@ BSWAP_SHUFB_CTL:
.long 0x04050607
.long 0x08090a0b
.long 0x0c0d0e0f
-.text

-SHA1_VECTOR_ASM sha1_transform_avx2
diff --git a/arch/x86/crypto/sha1_ni_asm.S b/arch/x86/crypto/sha1_ni_asm.S
index 2f94ec0e763b..4aa8507b15b4 100644
--- a/arch/x86/crypto/sha1_ni_asm.S
+++ b/arch/x86/crypto/sha1_ni_asm.S
@@ -71,9 +71,16 @@
#define MSG3 %xmm6
#define SHUF_MASK %xmm7

+.text

-/*
- * Intel SHA Extensions optimized implementation of a SHA-1 update function
+/**
+ * sha1_transform_ni - Calculate SHA1 hash using the x86 SHA-NI feature set
+ * @digest: address of current 20-byte hash value (%rdi, DIGEST_PTR macro)
+ * @data: address of data (%rsi, DATA_PTR macro);
+ * data size must be a multiple of 64 bytes
+ * @blocks: number of 64-byte blocks (%rdx, NUM_BLKS macro)
+ *
+ * This function supports 64-bit CPUs.
*
* The function takes a pointer to the current hash values, a pointer to the
* input data, and a number of 64 byte blocks to process. Once all blocks have
@@ -85,15 +92,10 @@
* The indented lines in the loop are instructions related to rounds processing.
* The non-indented lines are instructions related to the message schedule.
*
- * void sha1_ni_transform(uint32_t *digest, const void *data,
- uint32_t numBlocks)
- * digest : pointer to digest
- * data: pointer to input data
- * numBlocks: Number of blocks to process
+ * Return: none
+ * Prototype: asmlinkage void sha1_transform_ni(u32 *digest, const u8 *data, int blocks)
*/
-.text
-.align 32
-SYM_FUNC_START(sha1_ni_transform)
+SYM_FUNC_START(sha1_transform_ni)
push %rbp
mov %rsp, %rbp
sub $FRAME_SIZE, %rsp
diff --git a/arch/x86/crypto/sha1_ssse3_asm.S b/arch/x86/crypto/sha1_ssse3_asm.S
index 263f916362e0..8151a079ba6c 100644
--- a/arch/x86/crypto/sha1_ssse3_asm.S
+++ b/arch/x86/crypto/sha1_ssse3_asm.S
@@ -450,20 +450,24 @@ BSWAP_SHUFB_CTL:
.long 0x0c0d0e0f

-.section .text
-
W_PRECALC_SSSE3
.macro xmm_mov a, b
movdqu \a,\b
.endm

-/*
- * SSSE3 optimized implementation:
+.text
+
+/**
+ * sha1_transform_ssse3 - Calculate SHA1 hash using the x86 SSSE3 feature set
+ * @digest: address of current 20-byte hash value (%rdi, CTX macro)
+ * @data: address of data (%rsi, BUF macro);
+ * data size must be a multiple of 64 bytes
+ * @blocks: number of 64-byte blocks (%rdx, CNT macro)
*
- * extern "C" void sha1_transform_ssse3(struct sha1_state *state,
- * const u8 *data, int blocks);
+ * This function supports 64-bit CPUs.
*
- * Note that struct sha1_state is assumed to begin with u32 state[5].
+ * Return: none
+ * Prototype: asmlinkage void sha1_transform_ssse3(u32 *digest, const u8 *data, int blocks)
*/
SHA1_VECTOR_ASM sha1_transform_ssse3

@@ -545,9 +549,16 @@ W_PRECALC_AVX
vmovdqu \a,\b
.endm

-
-/* AVX optimized implementation:
- * extern "C" void sha1_transform_avx(struct sha1_state *state,
- * const u8 *data, int blocks);
+/**
+ * sha1_transform_avx - Calculate SHA1 hash using the x86 AVX feature set
+ * @digest: address of current 20-byte hash value (%rdi, CTX macro)
+ * @data: address of data (%rsi, BUF macro);
+ * data size must be a multiple of 64 bytes
+ * @blocks: number of 64-byte blocks (%rdx, CNT macro)
+ *
+ * This function supports 64-bit CPUs.
+ *
+ * Return: none
+ * Prototype: asmlinkage void sha1_transform_avx(u32 *digest, const u8 *data, int blocks)
*/
SHA1_VECTOR_ASM sha1_transform_avx
diff --git a/arch/x86/crypto/sha256-avx-asm.S b/arch/x86/crypto/sha256-avx-asm.S
index 3baa1ec39097..2a60af20a3ff 100644
--- a/arch/x86/crypto/sha256-avx-asm.S
+++ b/arch/x86/crypto/sha256-avx-asm.S
@@ -94,9 +94,9 @@ SHUF_00BA = %xmm10 # shuffle xBxA -> 00BA
SHUF_DC00 = %xmm12 # shuffle xDxC -> DC00
BYTE_FLIP_MASK = %xmm13

-NUM_BLKS = %rdx # 3rd arg
-INP = %rsi # 2nd arg
CTX = %rdi # 1st arg
+INP = %rsi # 2nd arg
+NUM_BLKS = %rdx # 3rd arg

SRND = %rsi # clobbers INP
c = %ecx
@@ -339,15 +339,21 @@ a = TMP_
ROTATE_ARGS
.endm

-########################################################################
-## void sha256_transform_avx(state sha256_state *state, const u8 *data, int blocks)
-## arg 1 : pointer to state
-## arg 2 : pointer to input data
-## arg 3 : Num blocks
-########################################################################
.text
+
+/**
+ * sha256_transform_avx - Calculate SHA256 hash using the x86 AVX feature set
+ * @digest: address of current 32-byte hash value (%rdi, CTX macro)
+ * @data: address of data (%rsi, INP macro);
+ * data size must be a multiple of 64 bytes
+ * @blocks: number of 64-byte blocks (%rdx, NUM_BLKS macro)
+ *
+ * This function supports 64-bit CPUs.
+ *
+ * Return: none
+ * Prototype: asmlinkage void sha256_transform_avx(u32 *digest, const u8 *data, int blocks)
+ */
SYM_FUNC_START(sha256_transform_avx)
-.align 32
pushq %rbx
pushq %r12
pushq %r13
diff --git a/arch/x86/crypto/sha256-avx2-asm.S b/arch/x86/crypto/sha256-avx2-asm.S
index 9bcdbc47b8b4..2f2d332f41a4 100644
--- a/arch/x86/crypto/sha256-avx2-asm.S
+++ b/arch/x86/crypto/sha256-avx2-asm.S
@@ -89,9 +89,9 @@ BYTE_FLIP_MASK = %ymm13

X_BYTE_FLIP_MASK = %xmm13 # XMM version of BYTE_FLIP_MASK

-NUM_BLKS = %rdx # 3rd arg
-INP = %rsi # 2nd arg
CTX = %rdi # 1st arg
+INP = %rsi # 2nd arg
+NUM_BLKS = %rdx # 3rd arg
c = %ecx
d = %r8d
e = %edx # clobbers NUM_BLKS
@@ -516,15 +516,22 @@ STACK_SIZE = _CTX + _CTX_SIZE

.endm

-########################################################################
-## void sha256_transform_rorx(struct sha256_state *state, const u8 *data, int blocks)
-## arg 1 : pointer to state
-## arg 2 : pointer to input data
-## arg 3 : Num blocks
-########################################################################
.text
+
+/**
+ * sha256_transform_rorx - Calculate SHA512 hash using x86 AVX2 feature set
+ * including the RORX (rotate right logical without affecting flags) instruction
+ * @digest: address of current 32-byte hash value (%rdi, CTX macro)
+ * @data: address of data (%rsi, INP macro);
+ * data size must be a multiple of 64 bytes
+ * @blocks: number of 64-byte blocks (%rdx, NUM_BLKS macro)
+ *
+ * This function supports 64-bit CPUs.
+ *
+ * Return: none
+ * Prototype: asmlinkage void sha256_transform_rorx(u32 *digest, const u8 *data, int blocks)
+ */
SYM_FUNC_START(sha256_transform_rorx)
-.align 32
pushq %rbx
pushq %r12
pushq %r13
diff --git a/arch/x86/crypto/sha256-ssse3-asm.S b/arch/x86/crypto/sha256-ssse3-asm.S
index c4a5db612c32..087d03fb10e1 100644
--- a/arch/x86/crypto/sha256-ssse3-asm.S
+++ b/arch/x86/crypto/sha256-ssse3-asm.S
@@ -87,9 +87,9 @@ SHUF_00BA = %xmm10 # shuffle xBxA -> 00BA
SHUF_DC00 = %xmm11 # shuffle xDxC -> DC00
BYTE_FLIP_MASK = %xmm12

-NUM_BLKS = %rdx # 3rd arg
-INP = %rsi # 2nd arg
CTX = %rdi # 1st arg
+INP = %rsi # 2nd arg
+NUM_BLKS = %rdx # 3rd arg

SRND = %rsi # clobbers INP
c = %ecx
@@ -346,17 +346,21 @@ a = TMP_
ROTATE_ARGS
.endm

-########################################################################
-## void sha256_transform_ssse3(struct sha256_state *state, const u8 *data,
-## int blocks);
-## arg 1 : pointer to state
-## (struct sha256_state is assumed to begin with u32 state[8])
-## arg 2 : pointer to input data
-## arg 3 : Num blocks
-########################################################################
.text
+
+/**
+ * sha256_transform_ssse3 - Calculate SHA256 hash using the x86 SSSE3 feature set
+ * @digest: address of current 32-byte hash value (%rdi, CTX macro)
+ * @data: address of data (%rsi, INP macro);
+ * data size must be a multiple of 64 bytes
+ * @blocks: number of 64-byte blocks (%rdx, NUM_BLKS macro)
+ *
+ * This function supports 64-bit CPUs.
+ *
+ * Return: none
+ * Prototype: asmlinkage void sha256_transform_ssse3(u32 *digest, const u8 *data, int blocks)
+ */
SYM_FUNC_START(sha256_transform_ssse3)
-.align 32
pushq %rbx
pushq %r12
pushq %r13
diff --git a/arch/x86/crypto/sha256_ni_asm.S b/arch/x86/crypto/sha256_ni_asm.S
index 94d50dd27cb5..a7b3f86cc127 100644
--- a/arch/x86/crypto/sha256_ni_asm.S
+++ b/arch/x86/crypto/sha256_ni_asm.S
@@ -75,8 +75,16 @@
#define ABEF_SAVE %xmm9
#define CDGH_SAVE %xmm10

-/*
- * Intel SHA Extensions optimized implementation of a SHA-256 update function
+.text
+
+/**
+ * sha256_transform_ni - Calculate SHA256 hash using the x86 SHA-NI feature set
+ * @digest: address of current 32-byte hash value (%rdi, DIGEST_PTR macro)
+ * @data: address of data (%rsi, DATA_PTR macro);
+ * data size must be a multiple of 64 bytes
+ * @blocks: number of 64-byte blocks (%rdx, NUM_BLKS macro)
+ *
+ * This function supports 64-bit CPUs.
*
* The function takes a pointer to the current hash values, a pointer to the
* input data, and a number of 64 byte blocks to process. Once all blocks have
@@ -88,17 +96,10 @@
* The indented lines in the loop are instructions related to rounds processing.
* The non-indented lines are instructions related to the message schedule.
*
- * void sha256_ni_transform(uint32_t *digest, const void *data,
- uint32_t numBlocks);
- * digest : pointer to digest
- * data: pointer to input data
- * numBlocks: Number of blocks to process
+ * Return: none
+ * Prototype: asmlinkage void sha256_transform_ni(u32 *digest, const u8 *data, int blocks)
*/
-
-.text
-.align 32
-SYM_FUNC_START(sha256_ni_transform)
-
+SYM_FUNC_START(sha256_transform_ni)
shl $6, NUM_BLKS /* convert to bytes */
jz .Ldone_hash
add DATA_PTR, NUM_BLKS /* pointer to end of data */
diff --git a/arch/x86/crypto/sha512-avx-asm.S b/arch/x86/crypto/sha512-avx-asm.S
index 1fefe6dd3a9e..145534a0c6f7 100644
--- a/arch/x86/crypto/sha512-avx-asm.S
+++ b/arch/x86/crypto/sha512-avx-asm.S
@@ -49,15 +49,10 @@

#include <linux/linkage.h>

-.text
-
# Virtual Registers
-# ARG1
-digest = %rdi
-# ARG2
-msg = %rsi
-# ARG3
-msglen = %rdx
+digest = %rdi # ARG1
+msg = %rsi # ARG2
+msglen = %rdx # ARG3
T1 = %rcx
T2 = %r8
a_64 = %r9
@@ -265,14 +260,20 @@ frame_size = frame_WK + WK_SIZE
RotateState
.endm

-########################################################################
-# void sha512_transform_avx(sha512_state *state, const u8 *data, int blocks)
-# Purpose: Updates the SHA512 digest stored at "state" with the message
-# stored in "data".
-# The size of the message pointed to by "data" must be an integer multiple
-# of SHA512 message blocks.
-# "blocks" is the message length in SHA512 blocks
-########################################################################
+.text
+
+/**
+ * sha512_transform_avx - Calculate SHA512 hash using the x86 AVX feature set
+ * @digest: address of current 64-byte hash value (%rdi, digest macro)
+ * @data: address of data (%rsi, msg macro);
+ * data must be a multiple of 128 bytes
+ * @blocks: number of 128-byte blocks (%rdx, msglen macro)
+ *
+ * This function supports 64-bit CPUs.
+ *
+ * Return: none
+ * Prototype: asmlinkage void sha512_transform_avx(u32 *digest, const u8 *data, int blocks)
+ */
SYM_FUNC_START(sha512_transform_avx)
test msglen, msglen
je nowork
diff --git a/arch/x86/crypto/sha512-avx2-asm.S b/arch/x86/crypto/sha512-avx2-asm.S
index 5cdaab7d6901..bd9e08c8643d 100644
--- a/arch/x86/crypto/sha512-avx2-asm.S
+++ b/arch/x86/crypto/sha512-avx2-asm.S
@@ -51,8 +51,6 @@

#include <linux/linkage.h>

-.text
-
# Virtual Registers
Y_0 = %ymm4
Y_1 = %ymm5
@@ -68,13 +66,10 @@ XFER = YTMP0

BYTE_FLIP_MASK = %ymm9

-# 1st arg is %rdi, which is saved to the stack and accessed later via %r12
-CTX1 = %rdi
+CTX1 = %rdi # 1st arg, which is saved to the stack and accessed later via %r12
CTX2 = %r12
-# 2nd arg
-INP = %rsi
-# 3rd arg
-NUM_BLKS = %rdx
+INP = %rsi # 2nd arg
+NUM_BLKS = %rdx # 3rd arg

c = %rcx
d = %r8
@@ -557,14 +552,21 @@ frame_size = frame_CTX + CTX_SIZE

.endm

-########################################################################
-# void sha512_transform_rorx(sha512_state *state, const u8 *data, int blocks)
-# Purpose: Updates the SHA512 digest stored at "state" with the message
-# stored in "data".
-# The size of the message pointed to by "data" must be an integer multiple
-# of SHA512 message blocks.
-# "blocks" is the message length in SHA512 blocks
-########################################################################
+.text
+
+/**
+ * sha512_transform_rorx - Calculate SHA512 hash using the x86 AVX2 feature set
+ * including the RORX (rotate right logical without affecting flags) instruction
+ * @digest: address of 64-byte hash value (%rdi, CTX1 macro)
+ * @data: address of data (%rsi, INP macro);
+ * data must be a multiple of 128 bytes
+ * @blocks: number of 128-byte blocks (%rdx, NUM_BLKS macro)
+ *
+ * This function supports 64-bit CPUs.
+ *
+ * Return: none
+ * Prototype: asmlinkage void sha512_transform_rorx(u32 *digest, const u8 *data, int blocks)
+ */
SYM_FUNC_START(sha512_transform_rorx)
# Save GPRs
push %rbx
diff --git a/arch/x86/crypto/sha512-ssse3-asm.S b/arch/x86/crypto/sha512-ssse3-asm.S
index b84c22e06c5f..cd6a0455d548 100644
--- a/arch/x86/crypto/sha512-ssse3-asm.S
+++ b/arch/x86/crypto/sha512-ssse3-asm.S
@@ -49,15 +49,10 @@

#include <linux/linkage.h>

-.text
-
# Virtual Registers
-# ARG1
-digest = %rdi
-# ARG2
-msg = %rsi
-# ARG3
-msglen = %rdx
+digest = %rdi # ARG1
+msg = %rsi # ARG2
+msglen = %rdx # ARG3
T1 = %rcx
T2 = %r8
a_64 = %r9
@@ -264,18 +259,21 @@ frame_size = frame_WK + WK_SIZE
RotateState
.endm

-########################################################################
-## void sha512_transform_ssse3(struct sha512_state *state, const u8 *data,
-## int blocks);
-# (struct sha512_state is assumed to begin with u64 state[8])
-# Purpose: Updates the SHA512 digest stored at "state" with the message
-# stored in "data".
-# The size of the message pointed to by "data" must be an integer multiple
-# of SHA512 message blocks.
-# "blocks" is the message length in SHA512 blocks.
-########################################################################
-SYM_FUNC_START(sha512_transform_ssse3)
+.text

+/**
+ * sha512_transform_ssse3 - Calculate SHA512 hash using x86 SSSE3 feature set
+ * @digest: address of current 64-byte hash value (%rdi, digest macro)
+ * @data: address of data (%rsi, msg macro);
+ * data size must be a multiple of 128 bytes
+ * @blocks: number of 128-byte blocks (%rdx, msglen macro)
+ *
+ * This function supports 64-bit CPUs.
+ *
+ * Return: none
+ * Prototype: asmlinkage void sha512_transform_ssse3(u32 *digest, const u8 *data, int blocks)
+ */
+SYM_FUNC_START(sha512_transform_ssse3)
test msglen, msglen
je nowork

--
2.38.1